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The principle of lithium battery repair method 2: Low temperature can cause changes in the electrolyte inside the lithium battery, promoting chemical reactions in the newly frozen battery. The use of lithium batteries is actually a process of charging and discharging. During this period, the negative and positive charges inside the battery collide with each other. The reason why batteries are becoming increasingly unusable is that at normal room temperature, the kinetic energy inside electrons is relatively large, so the battery is in an active state and leakage is relatively frequent. When a lithium battery is placed in a low-temperature environment, the microstructure of the lithium film and electrolyte on the surface of the battery, as well as their interface, will undergo significant changes, resulting in temporary inactivity inside the battery and reduced leakage current. So after recharging, the battery life of the phone will increase.

The cyclic service life of lithium batteries is about 600 times. If the number of charges is increased, the thermal motion of the 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. Once the microstructure inside a lithium battery is damaged, it is impossible to fully recover, and long-term use of this method will accelerate the loss of the phone battery.

The principle of lithium battery repair method three is to perform deep discharge on the phone, which is to achieve deeper recharging by depleting internal energy, which requires some unconventional methods. Find a way to connect the phone to a 1.5V small light bulb, and the internal power of the lithium battery will be transferred to the small light bulb until it is fully discharged. A mobile phone needs to slowly drain its power 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, a recharged phone battery can be used for a longer period of time.

18650 lithium battery repair method:

1. After using up all your batteries, take them off and use temperature treatment. 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 already carry memory electricity. This method can release some of the memory electricity. When winter comes, leave it outside for a while, and then go inside.

2. Another method is to remove the battery, let it sit for about a week, and slowly consume the electricity. You need to use a machine to fully consume the electricity first. Then fully charge it again. It is estimated that your current charging time is very short. After fully charging, disconnect and charge again. Repeat this process a few times, and it will definitely be effective.

Battery repair refers to the general term for repairing rechargeable batteries that have degraded or failed in performance through physical or chemical means. By repairing, the capacity of the battery can be restored, the service life of the battery can be extended, and the performance of the battery can be improved.

A battery, also known as a chemical power source, is a device that can provide direct current power to electrical appliances. Chemical power sources convert chemical energy into electrical energy through electrochemical reactions of oxidation-reduction. A primary battery is a disposable battery, while a secondary battery is a battery that can be used multiple times, so the term secondary actually means multiple times. Secondary batteries are also known as rechargeable batteries or batteries.

Battery repair refers to the general term for repairing batteries that have degraded or failed in performance through physical or chemical means.

Secondary batteries, also known as "rechargeable batteries," refer to batteries that can activate active substances through charging after discharge and continue to be used. The main rechargeable batteries on the market include "nickel hydrogen", "nickel cadmium", "lead-acid (lead-acid batteries)", "lithium-ion (including lithium batteries and lithium-ion polymer batteries)", etc. There are many methods for repairing lead-acid batteries, including "water therapy", "shallow circulation high current charging method", "nano carbon sol battery activator repair", "pulse battery repair instrument repair", "battery repair liquid repair", etc.

Sulfation

Irreversible sulfation, also known as sulfation, occurs in lead-acid batteries. During discharge, both the positive and negative plates produce a compound called lead sulfate. Lead sulfate is a substance that is insoluble in water and non-conductive. Under normal circumstances, the crystals of lead sulfate formed after discharge are relatively small. When charged, it is more easily dissolved and reduced to lead under the action of electricity. If not used properly, it often leads to insufficient charging, dehydration, and over discharge. Lead sulfate will form coarse and hard crystals, which are difficult to reduce to lead using ordinary methods. Therefore, it is called irreversible sulfation. Due to sulfation, on the one hand, it can block sulfuric acid and other substances. Contact and reaction of active substances: On the other hand, reducing the amount of active substances can cause a decrease in battery capacity, and in severe cases, it can lead to the end of battery life

Removal of active substances

When we repair used batteries, some batteries will flow out some reddish brown liquid from the water injection hole after they are repaired with water. That is, the active substances fall off. The reasons for the falling off of active substances can be explained as follows: 1. The batteries are affected by external forces, such as vibration, wrestling, etc. 2. α - PbO2. β PbO2 variant model. α PbO2 is the active substance skeleton. When the batteries are charged and discharged, part of α - PbO2 is converted into β - PbO2, resulting in softening and falling off. 3. As the cycle progresses, the active substances gradually crystallize from the indeterminate state, that is, the crystallinity increases, the number of hydrated polymer chains decreases, the piezoresistance of gel increases, and the electrical contact between grains worsens. The active substance falls off. 4. It is also believed that with the continuous charging and discharging, the active substance forms several dense clumps. When the clumps lack sufficient connections, the active substance will fall off and the battery will fail

The voltage of the battery

The potential difference between the positive and negative poles of a battery is called the voltage of the battery, which is generally measured using a multimeter. During the battery repair process, the voltage can be expressed in three forms: the first is called the no-load voltage, also known as the open circuit voltage, which is the battery voltage measured when the battery is not charging and without a load; the second is called the load voltage, which is the battery voltage measured at a certain time during the battery discharge process. The third is called the online voltage, which is the voltage measured at a certain moment during the battery charging process. Understanding the three voltage measurement methods can help determine whether the battery is disconnected or short circuited; The calculation of battery internal resistance is of great significance

The capacity of a battery

The capacity of a battery is an important indicator to measure its performance. It is generally expressed in ampere hours. The total term for discharge time (hours) and discharge current (amperes) is capacity=discharge time x discharge current. The actual capacity of a battery depends on the amount and utilization rate of active substances in the battery. The more active substances there are, the higher the utilization rate of active substances, and the larger the battery capacity. Conversely, the smaller the capacity.

Hydrotherapy

For sulfurized batteries, the battery can be discharged first, the original electrolyte can be poured out, and a thinner electrolyte with a density below 1.10g/cm3 can be injected, that is, water can be added to dilute the electrolyte in the battery to improve the solubility of lead sulfate. Using a current with a rate of less than 20 hours, charge the battery for a longer period of time within the range of liquid temperature not exceeding 20 ℃ to 40 ℃. Finally, adjust the electrolyte density in the battery to the standard solution concentration with a slightly higher electrolyte when fully charged. Generally, the vulcanization phenomenon can be eliminated, and the capacity can be restored to 80% or above, which is considered a successful repair.

The mechanism of this method is to reduce the density of the acid solution and increase the solubility product of sulfates. Small current long-term charging is adopted to reduce Ohmic polarization and delay the early occurrence of water decomposition voltage, ultimately reducing or eliminating the sulfurization phenomenon in dissolution and conversion into active substances.

This method is suitable for water filled batteries and can be repeatedly treated for severe vulcanization. It can be self repaired without investing in equipment. The disadvantage is that the process is too cumbersome and not very practical for sealed batteries.

Shallow cycle charging method

For sulfurized batteries, it is advisable to use a high current rate within 5 hours, charge the battery to a slightly overcharged state and control the liquid temperature to not exceed 40 degrees, then discharge 30%. This can be repeated several times to reduce and eliminate sulfurization phenomenon.

The mechanism of this method is to use overcharged gas to slightly wash the surface of the electrode plate with sulfide salts, causing them to desorb, dissolve, and transform into active substances.

The characteristic of this method is that it can significantly repair minor vulcanization. But it is not suitable for old batteries because the gas that precipitates washes out the sulfate also strongly washes out the active material of the positive electrode plate, making the active material soft or even falling off.

Repair instrument repair

For vulcanized batteries, some specialized pulse repair devices can be used to charge and discharge the battery several times to eliminate vulcanization. [1]

The mechanism of this method, from a solid physics perspective, is that any insulation layer can be broken down at a sufficiently high voltage. Once the insulation layer is broken down, it will transition from an insulating state to a conductive state. If a momentary high voltage is applied to a sulfate layer with a high conductivity difference and resistance value, the large lead sulfate crystals can be broken down. If the high voltage is short enough and current limiting is applied, and the charging current is controlled appropriately while breaking through the sulfide layer, it will not cause battery gas evolution. The amount of gas evolution in a battery depends on the terminal voltage and charging current of the battery. If the pulse width is short enough and the duty cycle is large enough, it can ensure the breakdown of coarse lead sulfate crystals. At the same time, micro charging cannot form gas evolution in time. If there is negative pulse depolarization, it can better ensure the gas precipitation of the electrode plate when the sulfate layer is broken down, thus achieving pulse elimination vulcanization. The characteristics of this method are that the pulse repair chargers on the market are uneven, and many pulse chargers, even specialized repair equipment, have unreasonable pulse width ratio, duty cycle, and negative pulse design that cannot achieve the purpose of de vulcanization.

Repair of Nanocarbon Sol Battery Activator

Battery activator: Nanocarbon sol is a type of nanocarbon material. Nanocarbon materials refer to dispersed phases with at least one scale

Carbon materials with dimensions less than 100nm. Under the action of an electric field, the active ingredients of the activator can solidify the electrode plate; Irreversible sulfate crystallization due to disintegration; Uniformly adsorb on the surface of the electrode to form a protective film, preventing the detachment of active substances and the formation of vulcanization, polarization, and lead dendrization of the electrode; Activate the active substance of the battery; Reduce the internal resistance of the battery and enhance the electrochemical reaction of the battery. This type of repair solution only has a good repair effect on batteries, and the repaired batteries can last for more than 12 months.

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