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The numbers 18650 in the 18650 lithium battery assembly of the 48v40a lithium battery in Qianjiang City represent the external dimensions: 18 refers to the battery diameter of 18.0mm, and 650 refers to the battery height of 65.0mm. The common 18650 batteries are divided into lithium-ion batteries, lithium iron phosphate batteries, and nickel hydrogen batteries. The voltage and capacity specifications are: nickel hydrogen battery voltage is 1.2V, common capacity is 2500MAH, lithium-ion battery voltage is 3.6V, common capacity is 1500MAH-3100MAH. 2.52-5 million (rent) -80000 (salary) -40000 (taxes, electricity) -120000 (publicity expenses) -20000 (other expenses)=2.21 million. Assembly of 48v40a lithium batteries in Qianjiang City

1. Definition

Lithium ion battery: Lithium ion batteries have advantages such as light weight, large capacity, and no memory effect, resulting in 18650 lithium batteries

Universal application - Many digital devices use lithium-ion batteries as power sources, although their prices are relatively expensive. Lithium ion batteries have a high energy density, with a capacity 1.5 to 2 times that of nickel hydrogen batteries of the same weight, and have a very low self discharge rate. In addition, lithium-ion batteries have the advantages of almost no "memory effect" and no toxic substances, which are also important reasons for their widespread application. Additionally, please note that lithium batteries are generally labeled with English 7.2V lithium-ion battery, 7.2V lithium-ion secondary battery, and 7.2V lithium-ion rechargeable battery on the outside. Therefore, when purchasing batteries, users must carefully read the markings on the exterior of the battery block to prevent cadmium nickel and hydrogen nickel batteries from being mistaken for lithium batteries due to unclear battery types. For example, a set of equipment with an investment of 39000 yuan requires 1 to 2 workers. There are no environmental temperature requirements or geographical restrictions (there are no pollutants during production). Pure manual operation, fully computer-controlled, with no restrictions on the location of the factory. Assembly of 48v40a lithium batteries in Qianjiang City

2. Type

The difference between lithium batteries is that both 3.7V and 4.2V are the same. It's just that the manufacturer's labeling is different. 3.7V refers to the platform voltage (i.e. average voltage) at which the battery is discharged during use, while 4.2V refers to the voltage at full charge. The common rechargeable 18650 lithium batteries have a voltage standard of 3.6 or 3.7V, and when fully charged, it is 4.2V, which has little to do with the amount of electricity (capacity). The mainstream capacity of 18650 batteries ranges from 1800mAh to 2600mAh (18650 power batteries often have a capacity of 1200-1600mAh), The mainstream capacity even includes those with a capacity of 3500 or 4000mAh or above (to remind everyone, 18650 with a capacity of 3100mAh or above can be considered fake if it is domestically produced, and the maximum capacity currently produced is 3400mAh).

It is generally believed that when the no-load voltage of a lithium battery is set to 3.7V, it is considered to have run out of electricity. Lithium ion batteries should not be discharged with a no-load voltage below 3.7V, otherwise excessive discharge will damage the battery. 4.2V is the maximum limiting voltage for battery charging. It is generally believed that charging the no-load voltage of a lithium battery to 4.2V is considered fully charged. During the battery charging process, the voltage gradually rises from 3.7V to 4.2V. Charging a lithium battery cannot charge the no-load voltage above 4.2V, otherwise it will also damage the battery. This is the special feature of lithium batteries.

3. Purpose

The theoretical lifespan of 18650 batteries is 1000 cycles of charging. Due to its large capacity per unit density, 18650 is commonly used for most laptop batteries. In addition, due to its excellent stability performance in operation, it is widely used in various electronic fields: commonly used in high-end high light flashlights, portable power supplies, wireless data transmitters, thermal insulation clothing, shoes, portable instruments and meters, portable lighting equipment, portable printers, industrial instruments, instruments, etc. Assembly of 48v40a lithium batteries in Qianjiang City

4. Difference

18650 means a diameter of 18 millimeters and a length of 65 millimeters. The model of battery number 5 is 14500, with a diameter of 14 millimeters and a length of 50 millimeters. Generally, 18650 batteries are used more in industry and less in civilian use. The common ones are also used more in laptop batteries and high-end flashlights.

18650 is only the size and model of the battery, which can be divided into lithium-ion 18650, lithium iron phosphate 18650, nickel hydrogen 18650 (rare), and common 18650 is lithium-ion.

5. The principle of charging and discharging is that mobile phones need to slowly deplete their electrical energy through a lower voltage. Under normal circumstances, if the rated voltage of the phone is below 3.6 volts after being connected, it will automatically shut down After discharging, the recharged phone battery can be used for a longer period of time. 18650 lithium battery repair method: 1. After using up all your batteries, remove them and treat them with temperature. When the temperature is unstable, the battery will greatly shorten its usage time because the battery is not charged and a considerable number of lithium ions have already carried memory electricity. This method can release a part of the memory electricity. When winter comes, put it outside for a while, and then go inside.

The working principle of lithium-ion batteries refers to their charging and discharging principles. 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 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. during the process of using the battery), the lithium ions embedded in the negative carbon layer detach and move back to the positive electrode. The more lithium ions return to the positive electrode, the higher the discharge capacity. The battery capacity we usually refer to is the discharge capacity.

It is not difficult to see that during the charging and discharging process of lithium-ion batteries, lithium ions are in a motion state from positive electrode to negative electrode to positive electrode. If we vividly compare lithium-ion batteries to a rocking chair, with the two ends of the rocking chair being the two poles of the battery, and lithium-ion batteries are like excellent athletes running back and forth between the two ends of the rocking chair. So, experts have given lithium-ion batteries a cute name, rocking chair battery. Assembly of 48v40a lithium batteries in Qianjiang City

If there are too many charges during the charging and discharging process, the thermal motion of molecules will gradually destroy the microstructure of their internal molecular arrangement, and the efficiency of charge storage will gradually decrease. "The freezing process can easily damage the original internal structure of the battery, which may increase its ability to charge in the short term, but long-term use may not be effective."

The charging control of lithium batteries is divided into two stages. The first stage is constant current charging. When the battery voltage is below 4.2V, the charger will charge at a constant current. The second stage is the constant voltage charging stage. When the battery voltage reaches 4.2V, due to the characteristics of lithium batteries, if the voltage is too high, it will be damaged. The charger will fix the voltage at 4.2V, and the charging current will gradually decrease. When the current decreases to a certain value (usually 1/10 of the set current), the charging circuit will be cut off, and the charging completion indicator light will light up, indicating that the charging is completed.

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