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Complete Guide to Battery Basic Knowledge Q&A Questions

1. What is the difference between a primary battery and a rechargeable battery?

The electrochemistry inside the battery determines whether the type of battery is rechargeable. Based on their electrochemical composition and electrode structure, it can be inferred that the reactions between the internal structures of truly rechargeable batteries are reversible.

In theory, this reversibility is not affected by the number of cycles. Since charging and discharging can cause reversible changes in electrode volume and structure, the internal design of rechargeable batteries must support this change. Since a battery only performs one discharge, its internal structure is much simpler and does not need to support this change. Therefore, it is not possible to charge a single battery. This approach is dangerous and not economical. If it needs to be used repeatedly, there should be a choice of truly rechargeable batteries with a number of cycles of about 1000, which can also be called primary batteries or batteries.

2. Is there any other difference between a primary battery and a secondary battery?

Another obvious difference is their energy and load capacity, as well as their self discharge rate. Secondary batteries have much higher energy than primary batteries, but their load capacity is relatively small.

3. What are the advantages and disadvantages of rechargeable portable batteries?

Rechargeable batteries have a longer lifespan and can be cycled more than 1000 times. Although they are more expensive than dry batteries, they are more cost-effective if used frequently. The capacity of rechargeable batteries is lower than that of alkaline manganese batteries or zinc carbon batteries of the same specifications, for example, they discharge faster.

Another disadvantage is that due to their almost constant discharge voltage, it is difficult to predict when the discharge will end. When the discharge ends, the battery voltage will suddenly decrease. If used on a camera, the battery suddenly runs out of charge and has to be terminated.

On the other hand, rechargeable batteries can provide higher capacity than most primary batteries.

However, Li ion batteries can be widely used in photographic equipment due to their high capacity, high energy density, and gradually decreasing discharge voltage with increasing discharge depth.

4. How does a rechargeable battery achieve its energy conversion?

Each type of battery has the ability of electrochemical conversion, which directly converts stored chemical energy into electrical energy. In terms of secondary electrons (also known as rechargeable portable batteries), during the discharge process, chemical energy is converted into electrical energy; During the charging process, electrical energy is converted back into chemical energy. This process can generally be charged and discharged more than 500 times depending on the electrochemical system, while our product Li ion can be charged and discharged more than 1000 times repeatedly. Li ion is a new type of rechargeable portable battery. Its rated voltage is 3.6V, and its discharge voltage gradually decreases with the depth of discharge, unlike other rechargeable batteries where the voltage suddenly drops before discharge.

5. What is a Li ion battery?

Li ion is the development of lithium batteries. So before introducing Li ion, let's first introduce lithium batteries. For example, the button type battery used in cameras in the past belonged to lithium batteries. The positive electrode material of a lithium battery is lithium metal, and the negative electrode is carbon. When charging the battery, lithium ions are generated on the positive electrode of the battery, and the generated lithium ions move through the electrolyte to the negative electrode. As the negative electrode, carbon has a layered structure with many micropores, and the lithium ions that reach the negative electrode are embedded into the micropores of the carbon layer. The more lithium ions embedded, the higher the charging capacity. Similarly, when discharging the battery (i.e. the process we use the battery), the lithium ions embedded in the negative carbon layer are released and move back to the positive electrode. The more lithium ions are returned to the positive electrode, the higher the discharge capacity. The battery capacity we usually refer to is the discharge capacity. During the charging and discharging process of Li ion, the lithium ion is in a state of motion from positive electrode to negative electrode to positive electrode. Li ion is like a rocking chair, with the two ends of the rocking chair being the poles of the battery, while lithium ions run back and forth in the rocking chair like athletes. So Li ion is also known as a rocking chair battery.

6. What are the components of a Li ion battery?

(1) Battery upper and lower covers (2) positive electrode - active material is lithium cobalt oxide (3) separator - a special composite film

(4) Negative electrode - active substance is carbon (5) organic electrolyte (6) battery shell (divided into steel shell and aluminum shell)

7. What are the advantages of Li ion batteries? What are the drawbacks?

Li ion has the following advantages:

1) The working voltage of a single battery can reach up to 3.6-3.8V:

2) The specific energy is large, and currently the actual specific energy that can be achieved is 100-115Wh/kg and 240-253Wh/L (twice as much as Nl Cd and 1.5 times as much as Ni MH). In the future, with the development of technology, the specific energy can be as high as 150Wh/kg and 400Wh/L

3) The cycle life is long, usually reaching 500 or even 1000 times. For low current discharge appliances, the battery's service life will double the competitiveness of the appliance

4) Good safety performance, pollution-free, and no memory effect. As the predecessor of Li ion, lithium batteries have reduced their application areas due to the formation of dendrites and short circuits caused by metallic lithium. Li ion does not contain elements that pollute the environment such as cadmium, lead, and mercury. A major drawback of some Ni Cd batteries in certain processes (such as sintering) is the "memory effect", which seriously restricts the use of batteries. However, Li ion does not have this problem at all.

5) Low self discharge

The self discharge rate of Li ion, which is fully charged at room temperature and stored for one month, is about 10%, much lower than the 25-30% of Ni Cd and 30-35% of Ni and MH. Li ion also has certain drawbacks, such as:

1) The cost of batteries is relatively high. Mainly manifested in the high price of LiCoO2 (limited Co resources) and difficulty in purifying the electrolyte system.

2) Cannot discharge with high current. Due to organic electrolyte systems and other reasons, the internal resistance of batteries is relatively high compared to other types of batteries. Therefore, a lower discharge current density is required, and the discharge current is generally below 0.5C, which is only suitable for use in small and medium-sized electrical appliances.

3) Need to protect circuit control.

A、 Overcharge protection: Overcharging the battery will damage the positive electrode structure and affect performance and lifespan; Simultaneously overcharging causes the electrolyte to decompose, resulting in high internal pressure and leakage problems; Therefore, it must be charged at a constant voltage of 4.1V-4.2V;

B、 Overdischarge protection: Overdischarge can make it difficult to recover the active substance, so it is also necessary to have protective circuit control.

8. What is the lithium-ion manufacturing process?

1) Ingredients

Mix specialized solutions and adhesives with powdered positive and negative active substances, stir at high speed, and make a paste like positive and negative active substance.

2) Tu Mo

Apply the prepared slurry evenly on the surface of the metal foil, dry it, and make positive and negative electrode plates separately.

3) Assembly

The battery assembly process is completed by placing the positive electrode plate, separator, negative electrode plate, and separator in a top-down order, winding them to form the battery core, and then injecting electrolyte and sealing them. Produce finished batteries.

4) To transform into

Use specialized battery charging and discharging equipment to conduct charging and discharging tests on finished batteries, and test each battery. Select qualified finished batteries and wait for them to leave the factory.

9. How are the safety characteristics of lithium-ion achieved?

In order to ensure the safe and reliable use of Li ion, experts have carried out very strict and meticulous battery safety performance design to achieve battery safety assessment indicators.

1) Diaphragm 135 ℃ automatic shut-off protection

Adopting internationally advanced Celgas2300pE pp pE three-layer composite film. When the battery reaches a temperature rise of 120 ℃, the membrane pores on both sides of the pE composite film close, the internal resistance of the battery increases, and the internal temperature rise of the battery slows down. When the battery reaches a temperature rise of 135 ℃, the PP membrane pores close, the internal circuit of the battery breaks, and the battery no longer heats up, ensuring the safety and reliability of the battery.

2) Add additives to the electrolyte

When the battery is overcharged and the battery voltage is higher than 4.2V, electrolyte additives aggregate with other substances in the electrolyte, resulting in a significant increase in the internal resistance of the battery. A large area of open circuit is formed inside the battery, and the battery no longer heats up.

3) Battery cover composite structure

The battery cover adopts a scratch explosion-proof ball structure. When the battery is heated up, some of the gas generated during the activation process inside the battery expands, increasing the internal pressure of the battery. The pressure reaches a certain degree, and the scratch cracks and releases gas.

4) Various environmental abuse tests

Conduct various abuse experiments, such as external short circuits, overcharging, puncture, impact, incineration, etc., to evaluate the safety performance of the battery. At the same time, temperature shock experiments and mechanical performance experiments such as vibration, drop, and impact were conducted on the battery to examine its performance in actual usage environments.

9. What charging limit voltage? Rated capacity? Rated voltage? Termination voltage?

A、 Charging limit voltage

According to the manufacturer's regulations, the voltage value of the battery when transitioning from constant current charging to constant voltage charging.

B、 Rated capacity

The battery capacity indicated by the manufacturer refers to the amount of electricity that the battery should provide when discharged at a rate of 5 hours to the termination voltage under an ambient temperature of 20 ℃± 5 ℃, expressed in C5, in ampere hours or milliampere hours.

C、 Nominal voltage

Used to represent an approximate value of battery voltage.

D、 Termination voltage

The load voltage of the battery at the termination of discharge is specified as n * 2.75V (the number of series connected lithium-ion single cell batteries is represented by "n").

10. Why does the constant voltage charging current gradually decrease?

Because when the constant current process terminates, the electrochemical polarization inside the battery remains at the same level throughout the entire constant current, constant voltage process, and constant electricity

Under the influence of the field, the concentration polarization of internal Li+gradually disappears, and the migration number and velocity of ions show a gradual decrease in current.

11. What is the capacity of a battery?

The capacity of a battery can be divided into rated capacity and actual capacity. The rated capacity of a battery refers to the minimum amount of electricity that is specified or guaranteed to be discharged under certain discharge conditions when designing and manufacturing batteries. Li ion stipulates that batteries should be charged for 3 hours under normal temperature, constant current (1C), and constant voltage (4.2V) controlled charging conditions. The actual capacity of a battery refers to the actual amount of electricity released under certain discharge conditions, mainly influenced by discharge rate and temperature (therefore, strictly speaking, the battery capacity should indicate the charging and discharging conditions). The common units of capacity are: mAh, Ah=1000mAh).

12. What is battery internal resistance?

It refers to the resistance that a battery experiences when the current flows through its interior during operation. It consists of two parts: ohmic internal resistance and polarization internal resistance. The high internal resistance of the battery can lead to a decrease in the discharge working voltage and a shortened discharge time. The size of internal resistance is mainly influenced by factors such as the material, manufacturing process, and battery structure of the battery. It is an important parameter for measuring battery performance. Note: The standard is generally based on the internal resistance in the charging state. The internal resistance of the battery needs to be measured using a dedicated internal resistance meter, rather than using a multimeter's ohmmeter range.

13. What is open circuit voltage?

It refers to the potential difference between the positive and negative terminals of a battery when there is no current flowing through the circuit and it is not in working condition. In general, the open circuit voltage of Li ion is around 4.1-4.2V when fully charged, and around 3.0V when discharged. The state of charge of the battery can be determined by the open circuit voltage of the battery.

14. What is working voltage?

Also known as terminal voltage, it refers to the potential difference between the positive and negative terminals of a battery when there is current in the circuit during operation. In the discharge state of the battery, when the current flows through the inside of the battery, there is no need to overcome the resistance caused by the internal resistance of the battery, so the working voltage is always lower than that of the open circuit battery, and the opposite is true during charging. The discharge working voltage of Li ion is around 3.6V.

15. What is a discharge platform?

The discharge platform stops charging at a constant voltage of 4.2V and an electrical current of less than 0.01C, and then stands for 10 minutes to discharge to 3.6V at any rate of discharge current. It is an important criterion for measuring the quality of batteries.

16. What is the (charge discharge) rate? Time rate?

It refers to the current value required for a battery to discharge its rated capacity within a specified time, which is equal to a multiple of the battery's rated capacity in terms of data value, usually represented by the letter C. If the nominal rated capacity of the battery is 600mAh, it is 1C (1 rate), 300mAh is 0.5C, 6A (600mAh) is 10C, and so on

Hour rate, also known as hourly rate, refers to the number of hours it takes for a battery to discharge its rated capacity at a certain current. For example, if the rated capacity of a battery is 600mAh, it takes 1 hour to discharge its rated capacity at a current of 600mAh. Therefore, a current of 600mAh is called a 1-hour rate, and so on

17. What is self discharge rate?

Also known as charge retention capacity, it refers to the ability of a battery to maintain the amount of electricity stored under certain conditions in an open circuit state. Mainly affected by factors such as battery manufacturing process, materials, and storage conditions. It is an important parameter for measuring battery performance.

Note: After the battery is fully charged and left idle, a certain degree of self discharge is normal. According to the GB standard, after LI ion, open the circuit and let it stand for 28 days under the condition of 20 ± 2 ℃. Allow for battery capacity loss.

18. What is internal pressure?

The internal pressure of a battery refers to the gas generated during the charging and discharging process of a sealed battery, which is mainly affected by factors such as battery material, manufacturing process, and battery structure. The main reason for its occurrence is due to the accumulation of moisture and gases generated by the decomposition of organic solutions inside the battery.

High rate continuous overcharging can lead to an increase in battery temperature and internal pressure, and in severe cases, it can have a destructive impact on the performance and appearance of the battery, such as leakage, bulging, increased internal resistance, shortened discharge time and cycle life.

Any form of Li ion overload can cause serious damage to battery performance, even explosion. During the charging process, Li ion needs to use a constant current and voltage charging method to avoid overcharging the battery.

19. Why do batteries need to be stored for a period of time before they can be packaged and shipped?

The storage performance of batteries is an important parameter for measuring the overall stability of battery performance. After a certain period of storage, the battery's capacity and internal resistance are allowed to change to a certain extent. After a period of storage, the electrochemical performance of the internal components can be stabilized, and the size of the self discharge performance of the battery can be understood to ensure the quality of the battery.

20. Why transform into?

After battery manufacturing, the process of activating the internal positive and negative electrode materials through certain charging and discharging methods to improve the battery's charging and discharging performance, as well as the comprehensive performance of self discharge and storage, is called formation. The battery powder can only reflect its true performance after being formed.

21. What is capacity sharing?

In the manufacturing process of batteries, due to technological reasons, the actual capacity of the battery cannot be completely consistent. The process of testing and classifying the battery according to capacity through a certain charging and discharging system is called capacity division.

22. What is pressure drop?

Qualitatively charge the battery to over 80% and measure its no-load voltage. The 5W/2W battery is used as a load to connect the positive and negative extreme switches of the battery as a circuit breaker, and the device for the circuit is connected in series. After turning on the switch, the voltage drop should not exceed 0 within 5 seconds. 4V, qualified mainly for testing battery load performance.

23. What is static resistance?

Internal resistance of the battery during discharge

24. What is dynamic resistance?

The internal resistance of the battery during charging.

25. What is the load capacity of a battery?

When the positive and negative terminals of the battery are connected to the appliance, the output power of the appliance during operation is the load capacity of the battery.

26. What is charging efficiency? What is discharge efficiency?

Charging efficiency refers to the degree to which the electrical energy consumed by a battery during the charging process is converted into the chemical energy that the battery can store. Mainly affected by battery technology, formula, and working environment temperature of the battery. Generally, the higher the ambient temperature, the lower the charging efficiency.

Discharge efficiency refers to the ratio of the actual amount of electricity discharged to the rated capacity at the terminal voltage under certain discharge conditions. It is mainly affected by factors such as discharge rate, environmental temperature, internal resistance, etc. Generally, the higher the discharge rate, the lower the discharge efficiency. The lower the temperature, the lower the discharge efficiency.

27. What are the differences between various commonly used rechargeable batteries?

At present, nickel cadmium, nickel hydrogen, and lithium-ion rechargeable batteries are widely used in various portable electrical devices (such as laptops, cameras, and mobile phones), and each type of rechargeable battery has its own unique chemical properties. The main difference between nickel cadmium and nickel hydrogen batteries is that nickel hydrogen batteries have a relatively high energy density. Compared with batteries of the same model, nickel hydrogen batteries have twice the capacity of nickel cadmium batteries. This means that using nickel hydrogen batteries can greatly extend the working time of the equipment without adding extra weight to the electrical equipment. Another advantage of nickel hydrogen batteries is that; A greatly reduces the "memory effect" problem in cadmium batteries, making nickel hydrogen batteries more convenient to use. Nickel hydrogen batteries are more environmentally friendly than nickel cadmium batteries because they do not contain toxic heavy metal elements inside.

Li ion has also quickly become the standard power source for portable devices. Li ion can provide the same energy as nickel hydrogen batteries, but can reduce weight by about 35%, which is crucial for electrical devices such as cameras and laptops. The fact that Li ion has no "memory effect" and no toxic substances is also an important factor that makes it a standard power source.

32. Comparison of technical parameters for Ni, Cd, NiMH, and Li ion.

Battery Type Project Nickel Cadmium Rechargeable Battery Nickel Hydrogen Rechargeable Battery Lithium Ion Rechargeable Battery

1.21.21.23.6

Weight to energy ratio 5065105-140

Volume specific energy 150200300

Charging and discharging lifespan 5005001000

Self discharge rate (%) 25-3030-356-9

Whether there is a memory effect or not

Whether there is pollution or not

Note: The charging rate is all 1C

33. What are the "green batteries" currently being used and researched?

New green and environmentally friendly batteries refer to a type of high-performance, pollution-free battery that has been put into use or is currently being developed in recent years. The lithium-ion batteries, nickel metal hydride batteries, mercury free alkaline zinc manganese batteries currently in widespread use, as well as lithium or lithium-ion plastic batteries, combustion batteries, and electrochemical energy storage supercapacitors under development, all belong to the category of new green and environmentally friendly batteries. In addition, solar cells that utilize solar energy for photoelectric conversion are currently widely used.

34. What batteries will dominate the battery market?

With cameras, mobile and cordless phones, laptops, and multimedia devices with images and sound occupying an increasingly important position in household appliances, compared to primary batteries, rechargeable secondary batteries are also widely used in these fields. And rechargeable batteries will develop towards small size, light weight, capacity, and intelligence.

35. What is a lithium-ion battery?

It refers to a rechargeable battery that uses lithium ions as the reactive active substance. When the battery is discharged to the termination voltage, it can be recharged to restore its pre discharge state.

36. Working principle of lithium-ion batteries?

During discharge, the lithium in the intercalation compound between lithium and carbon dissolves from the negative electrode to form lithium ions, which pass through the electrolyte and embed into the positive electrode crystal to form intercalation compounds. During charging, the lithium ions embedded in the positive electrode return to the electrolyte and then form intercalation compounds with carbon on the negative electrode, repeating the process

37. What are the advantages of lithium-ion batteries compared to nickel/cadmium, nickel/hydrogen, and lead-acid batteries?

High specific energy, low self discharge rate, good high and low temperature performance, and long charging and discharging life.

38. What is the average voltage of a battery?

The average voltage during battery discharge from the beginning to the end of discharge.

39. What is the energy density of a battery?

The electrical energy contained in a unit volume of a battery.

What is the capacity of a battery?

The capacity of a battery refers to the electrical energy that can be released by the active substances in the battery participating in electrochemical reactions.

41. What is the design capacity of a battery?

According to the amount of active substances contained in the battery, the capacity of the battery calculated from electrochemical theory is called the design capacity.

42. What is the rated capacity of a battery?

The capacity that a battery can reach after being designed and influenced by the battery manufacturing process is called the rated capacity.

43. What is the operating temperature range of lithium-ion batteries?

Charging -10-45 ℃ Discharge -30-55 ℃

What is the rate discharge of a battery?

The ratio relationship between the discharge current (A) and the rated capacity (A/h) during discharge is expressed.

45. What is the hourly discharge rate of a battery?

The number of hours required to discharge the rated capacity according to a certain output current is called the discharge rate.

46. What are the raw materials used to make lithium-ion batteries?

Composed of materials such as positive electrode active substance, negative electrode active substance, current collector, separator, electrolyte, shell, etc.

47. What are the characteristics of lithium-ion batteries related to their model?

The shape, length, width, height, and capacity of the battery.

48. What are the two most important factors that affect the cycling performance of lithium-ion batteries?

The properties of active substances and the types and contents of impurities.

49. How to control the moisture inside the battery during the production process?

1. Take measures to prevent moisture and moisture.

2. Shorten the operation time and reduce the exposure time of the electrode in the air.

3. Reasonably and correctly carry out baking operations.

4. Try to work in a dry environment.

What is the active positive electrode material for lithium-ion batteries?

Lithium salts; Such as lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, etc.

51. What is the active negative electrode material for lithium-ion batteries?

Graphite powder

52. Why do conductive agents need to be added to electrode materials?

During battery operation, the active substance of the battery will not dissolve in the electrolyte during charging and discharging. To enhance the conductivity of the active substance with the grid and collector, conductive agents are added and discharged.

53. What is the composition of the electrolyte in lithium-ion batteries?

Commonly used are lithium hexafluorophosphate, lithium tetrafluorophosphate (LipF6, LiClO4), etc.

54. What is the purpose of ingredients?

Disperse the active substance evenly, facilitate uniform pulling, and maintain a constant amount of sizing.

55. Please briefly describe the process flow of ingredients.

56. The three basic parameters of positive and negative electrode pulling slurry.

Slurry temperature, speed, and dressing amount.

57. How to control the amount of dressing for polarizers?

According to the solid content and specific gravity of the positive and negative electrode slurry, adjust the gap between the cutting tools of the pulling machine head, and control the thickness of the pulling slurry to achieve control.

58. How to determine the quality of the polarizers during the slurry pulling process.

A flat and smooth surface, uniform dressing, good adhesion, and dryness of the electrode are considered good electrodes, and those with defects are considered bad electrodes.

59. The main equipment for cutting positive and negative electrodes.

Paper cutter, cutting machine.

60. Main precautions for positive and negative electrodes.

1. Check for burrs and unevenness on the cutting edge, and pay attention to the safety of the knife during operation.

2. The positive and negative cutting blades cannot be mixed.

3. During the cutting process, check the quality of the polarizers at any time, separate the unqualified ones into different stages, and do not mix them up.

4. After inspection, the cut pieces are immediately transferred to the subsequent process operations.

What is the purpose of positive and negative baking?

Remove moisture and organic solvents from the electrode.

62. The purpose of pressing positive and negative plates?

Make the active material in close contact with the grid and current collector, reduce the distance of electron movement, reduce the thickness of the electrode, increase the loading amount, and improve the utilization rate of battery volume. So as to increase the capacity of the battery.

What is the impact of tablet thickness on battery performance?

When the pressing thickness is too thick, it is easy to reduce the mass of active substances in the battery, decrease the mass of active substances per unit volume, and increase the polarization potential, thereby causing a decrease in the battery capacity.

When the thickness of the pressing plate is too thin, it is easy to increase the mass of active materials in the battery, reduce the effective surface area of the electrode, and thus cause waste of active materials and difficulties in high current.

What is the purpose of weighing polar plates?

Accurately understand and master the amount of dressing for polar patches.

65. What is the purpose of film preparation?

Maintain consistency in the proportion of active substances on the positive and negative electrodes.

66. Why do we need to perform the brushing operation?

Remove dust, material, burrs, etc. from the electrode.

67. What pole ear is used for the positive electrode plate?

Using aluminum strip pole ears.

68. What pole ear is used for the negative electrode?

Using nickel strip pole ears.

69. Equipment for welding pole ears?

The positive electrode uses an ultrasonic welding machine, and the negative electrode uses a spot welding machine.

70. What is the impact of humidity in the winding workshop on battery quality?

When the humidity inside the winding room is high, the water absorption capacity of the electrode is increased, which increases the moisture content of the electrode and generates more gas in the battery, increasing the internal pressure of the battery and endangering its safety performance. The increase in moisture consumes more active substances in the battery, leading to a decrease in battery capacity. When the humidity is low, the opposite is true,

71. What are the functions of air conditioning units and dehumidification systems in the winding workshop?

Maintain a constant indoor temperature and reduce indoor humidity to improve battery performance.

72. Can water be used to wipe the floor in the winding workshop?

may not

73. Main precautions for winding battery cells?

1. Align the polarizer and diaphragm paper flat. When holding down the electrode and diaphragm paper with your hands, apply moderate and even force. The elasticity of the battery cell winding is appropriate.

2. Pay attention to whether there are scratches, material loss, missing materials, air holes, bubbles, and other defects on the polarizer, as well as whether the diaphragm paper is defective. If there are any defects, dispose of them as waste.

3. Pay attention to the harmony of hands and feet when winding, and avoid being scratched by the winding needle.

73. The purpose and location of battery cell adhesive tape?

The position of the battery cell sticker does not deform after the battery cell is wound and formed. Stick adhesive tape at the bottom to prevent the bottom of the positive electrode inside the battery cell from coming into contact with the battery casing, causing a short circuit. Side stickers prevent deformation of the battery cells after being wound and formed. Stick adhesive tape at the bottom to prevent the bottom of the positive electrode inside the battery cell from coming into contact with the battery casing, causing a short circuit in the battery.

74. What equipment is used to weld the pole ear to the cover plate?

Ultrasonic and butt welding machines.

75. Requirements for battery cell resistance?

Greater than 20M Ω

76. What should I do if the resistance of the battery cell does not meet the requirements?

Repair

77. Why does Ji'er also need to stick adhesive tape?

Increase firmness and prevent short circuits caused by pole ear contact.

78. What inspections are required for the battery cover before use?

Inspection of external dimensions, shape, thickness, insulation, sealing, corrosion resistance, material holding, and other items.

What is the maximum pressure that the battery cover can withstand?

0.4Mpa

How to prevent battery leakage?

To prevent battery leakage, the following measures should be taken:

1. When welding the battery casing and cap, it should be firmly welded and sealed, with no missed or false welding, and no cracks, cracks or other defects in the weld seam.

2. When sealing steel balls, the size of the steel balls should be appropriate, and the material of the steel balls should be the same as that of the cap. Welding should be free of cracks and cracks, and the welding should be firm.

3. The positive pole of the cap is tightly connected, without gaps, and the insulation sealing gasket has appropriate elasticity, corrosion resistance, and is not prone to aging.

81. How to prevent unsealed batteries from absorbing water in the workshop under existing conditions?

1. The homework battery should be used in small quantities multiple times. Shorten the exposure time of the battery in the air.

2. Transfer the completed batteries to the next process in a timely manner. Try to shorten the dead time of the battery in the process as much as possible.

82. Humidity requirements for drying rooms?

The relative humidity is below 6%.

83. What is the impact of humidity in the drying room on the performance of batteries?

The increase in humidity increases the water absorption of the battery cells, leading to a decrease in battery capacity and an increase in internal pressure.

84. How to prevent moisture from entering the drying room as much as possible?

Less in and less out, less open doors, the doors of the drying room cannot be opened simultaneously.

85. Do you think the floor of the drying room can be wiped with water?

may not.

86. What treatments do batteries need to undergo before liquid injection?

Gluing and vacuum baking treatment.

87. Why do batteries need to be vacuum baked before liquid injection?

Try to remove the moisture and solvents contained in the battery cell as much as possible.

88. Why do batteries need to be weighed before liquid injection?

In order to accurately calculate the amount of liquid injected.

89. Battery liquid injection method?

Use a manual or automatic infusion machine to perform the infusion operation.

90. How to check if the battery is filled with electrolyte?

Using vacuum suction test, when using vacuum suction at the injection port, if the electrolyte is drawn up, it indicates that it is full, and if not, it indicates that it is not full.

91. What is the role of LiOF6 in electrolyte?

Conductive electrolyte.

92. What is the concentration of LipF6 in the electrolyte?

1mol/L

93. The role of solvents in electrolytes?

Dissolve the electrolyte to ionize it.

94. What is the conductivity range of the electrolyte?

8×10-3Ω-1

95. What is the effect of conductivity on battery operating current?

Conductivity affects the rate of discharge, the internal resistance of the battery, and the voltage of the battery.

96. What factors affect the internal resistance of batteries?

The conductivity of the electrolyte, the performance of the battery casing material, the conductivity of the electrode plate, and the cross-sectional area of the electrode ear material. The quality of battery welding.

97. What factors affect the capacity of a battery?

The characteristics, properties, types, models, and amounts of active substances of positive and negative electrode materials.

The correct ratio of positive and negative active substances.

The concentration and type of electrolyte.

Production process.

98. Do you think how to control the moisture inside the battery during the battery production process?

Strictly control the humidity of the environment and strengthen the baking of battery cells to control the moisture content of the battery during the production process.

Can a meter be used to measure the resistance of a battery when it is charged?

sure

100. What issues should be paid attention to when turning a chemical generator into a high-capacity battery?

Pay attention to whether the total power of the battery exceeds the power of the assembly machine.

The above article is quite helpful for novice battery enthusiasts!

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