How to repair batteries

Jun 25, 2019   Pageview:75

Is battery repair real? What is the principle of battery repair? In this paper, the main reasons of early failure of lead-acid batteries and the repair methods of lead-acid batteries are introduced in detail.

[battery repair] battery repair is really a detailed explanation of battery repair technology

Is battery repair real

With the development of power supply and distribution industry, communication industry, communication industry and electric vehicles, it also drives the development and technological progress and innovation of battery industry, which is the supporting power source. Because the lead-acid battery has excellent cost performance, so in addition to the portable electronic products on the market at home and abroad, for electric vehicles, UPS systems, telecommunications facilities (telecommunications center, satellite ground station), the internal combustion engine car, car, power station, substation, emergency power supply, ship and without electricity engineering of light energy storage power and so on more than 95% are use of lead-acid batteries.

Different types of batteries with different environmental conditions have different design and service life. Such as fixed exhaust type lead-acid battery at 20 ℃ and 25 ℃, under the condition of floating charge to use its life 15 years; VRLA lead-acid battery has a service life of 5~10 years under floating charge. Traction (power) exhaust lead-acid battery life of 1500 times; Power VRLA lead-acid battery life of about 700 times; Lead acid battery life of electric bicycle, electric motorcycle and electric tricycle is only about 350 weeks, that is, one year. The general life of VRLA lead-acid battery is 3~5 years. So the repair of lead-acid batteries for the market share of the largest, the highest frequency of use, the most widely used, life is short and prone to early failure of lead-acid batteries is the main object of work. These batteries prone to early failure can be resubmitted for use after repair, thus greatly extending the service life of the battery and achieving the purpose of both environmental protection and energy saving.

Battery repair method

1. Battery series repair method: this method can be adopted when the nominal voltage of a single battery is lower than 12V. For example, there is a 6V4Ah battery in the market which can be used to charge emergency lamps, while the single output of the tester is 12V. At this time, two 6V batteries can be connected in series to the tester for sulfur repair.

2. Output combination method: for batteries that have been put for a long time, or those with serious self-discharge and sulfidation, we cannot use the method of recharging and recovery. The output combination method has a better effect on severely vulcanized batteries. When using this method, the best charging current is 5A. Because of the superposition of the repair function, the negative pulse current of the repair is greater than the positive pulse current.

3, activation charge method: in fact, the battery in storage or use, we can regularly give it activated charge, that is, the so-called balanced charge, so the battery irreversible curing is very helpful, because it can prolong the life of the battery, is a very advocated practice. In general, we use the tester to charge - discharge - charge the battery regularly.

4, heating method: for the kind of battery that has been put for a long time, the electrolyte will naturally become seriously dry state. This heating method can be used if the customer is in urgent need of repair. First to be repaired after filling water batteries, in order to speed up the electrolyte to permeate inside the battery and its chemical reactions, and then we put the battery after filling water into 70 ℃ hot water immersion, finally take out the battery to normal repair work.

Automotive battery repair technology

First of all, we need to know that the battery is divided into open battery and valve-controlled sealed battery two, for different types of battery maintenance is not the same. We first look at the valve - controlled sealed battery repair method.

1, clean up

Before maintaining the battery, first clean the dust on the surface of the repaired battery and remove the dirt and rust on the terminal. Then open the exhaust valve and observe the electrolyte inside the battery.

2. Pry open the battery cover and handle according to the situation

Pry open the sticky or heat-sealed battery cover to expose the maintenance-free rubber exhaust valve of the battery. Remove the exhaust valve carefully and observe the internal condition of the battery. Check whether there are black impurities. If there are obvious black turbid impurities, it indicates that the positive plate of the battery has been significantly softened and the possibility of repairing the battery is relatively small. If there is no black turbid impurities, you need to wait 4 hours after the water has fully penetrated the battery. Meanwhile, add 0.1% ~ 0.5% electrolyte to the battery, and there will be flowing electrolyte on the battery. If the battery capacity is reduced only because of the long service time, it is not necessary to carry out this step and directly enter the precharge below.

3. Charge the battery with constant voltage and current limiting

Generally, the charging current is 0.1c ~ 0.25c. After 16.2v, the charging voltage is maintained by reducing the current. When the charging current drops to 0.03c, the charging is stopped. After charging, observe whether there are still free molecules inside the battery. If not, add 0.1% of the solution until there are a few free molecules. If there are free molecules in each cell, use a dump and a straw to suck out the visible free molecules, leaving the battery in a quasi-lean state. Note that during charging, gas with an electrolyte can escape through the vent, and the battery should be placed in a specific container to avoid environmental contamination.

After charging, after the battery is still for half an hour, measure the open circuit voltage of the battery, the voltage should be above 12v, if the battery voltage is lower than 12v, especially lower than 10.8v, the battery may have an internal short circuit, the battery has no maintenance value.

4, battery repair

Connect the positive and negative output of the repair instrument to the positive and negative pole column of the battery, open the repair instrument and repair the battery. The first repair time should be no less than 48 hours.

5. Capacity test

Discharge the battery according to 0.1c current, and record the discharge time. Its discharge current times the number of hours of time, is the capacity of the battery repair. If the battery capacity reaches more than 70% of the nominal capacity, end the repair. If the capacity does not reach 70% of the nominal capacity, continue charging according to step 3. After charging, continue to repair, in general, overage storage of a year's battery needs to carry out secondary repair, can be restored to overage storage before the state.

Note: c battery concept

C represents the capacity of the battery. For example, the starting battery used in the car has a capacity of 36ah, 54ah, 70ah, 90ah, 105ah, 112ah, 154ah, 182ah and so on. Charging current should vary according to battery capacity. 0.1 c. For a 36ah battery, the charging current is 36 0.1 = 3.6a. For the 112ah battery, the current of 0.1c is the current of 11.2a for charging. So, the current specified in this specification is just the number of ah's of the battery times all of them.

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