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If it is a lead-acid battery, a pulse charging and discharging instrument is usually used for a certain program of charging and discharging, and the crystalline lead sulfate is dissolved in the solution to achieve the purpose of restoring capacity; For lithium-ion batteries, it is common to perform one or two deep charges and discharges, but the effect is not too significant, as the memory effect of lithium-ion batteries can be almost negligible

If the appearance of the battery is not damaged, swollen, and there are no signs of short circuits or open circuits, the following methods can be used to attempt to repair the battery:

1. Use positive and negative pulses to depolarize and charge the battery, then fully discharge it. Repeat this process three times. If there are signs of capacity recovery, repeat the process several times to achieve better repair results.

2. Adding water for repair, deionized water or purified water must be added. Do not add tap water as it may cause the battery to self discharge excessively.

1. First, completely discharge the battery, as the internal acid density of the battery is basically below 1.1g/mL after discharge;

2. Remove the cover plate and then remove the safety valve, taking care to store it properly and not dirtying it for future use;

3. Adding water: Generally, a 12AH battery can add 8-10g of water per cell, while a 20AH battery can add around 15g of water per cell;

4. Let it stand for about an hour, then install the safety valve and cover plate;

5. Charge, fully charge, and then fully discharge. Repeat this cycle three times, and the capacity will be improved.

Lead acid batteries should achieve the following when not in use for a long time:

1. Before shelving, the battery must be fully charged, and it is generally recommended to recharge the battery within 2-3 months. If possible, it is best to charge it once every 1-2 months.

2. When electric vehicles are not in use, they need to be stored in a ventilated and cool room. After the battery pack is fully charged, the load line should be disconnected. Due to the self discharge of lead-acid batteries, it can cause sulfation. If not recharged for a long time, it will be difficult to restore capacity and affect battery life. Therefore, it is generally recommended to recharge the battery within 2-3 months to facilitate battery life.

To first detect the cause of the damage, use a machine for vulcanization and open the shell for repair of broken grids. The simple method is to add liquid and charge.

(1) Methods and steps

① Use a thin film to remove the soft plastic film covering the individual battery and expose the sealing valve inside.

② The circular sealing valve is located at the center of the surface of the battery box, usually with a small valve cap and a sealing mechanism inside. The sealing mechanisms vary from manufacturer to manufacturer. Remove the valve cap and carefully remove the sealing material inside. At this time, pay attention to the sealing material and its sequence before and after, do not make mistakes or break the sealing material, and put it in a clean and dust-free plastic bag for sealing and storage.

③ After the sealing valve is fully opened, you can see some internal conditions and estimate the degree of electrolyte drying.

④ Use a glass tube to absorb an appropriate amount of distilled water that has been mixed with additives, and inject it into the battery through the sealing port. Pay attention to the consistent amount of water injected into each battery as much as possible to measure its degree of drying. For those with severe drying, more water should be injected.

⑤ When injecting water, the individual battery should be placed flat, that is, it should be folded down so that the sealing port is in the horizontal direction. The purpose of this is to ensure that the water amount obtained by each individual cell battery is consistent. As the amount of water injected increases, the sealing port should gradually be raised and injected to a certain extent. The battery should be erected to check whether the water surface is higher than the electrode plate. When it is already 5mm above and above the top of the electrode plate, stop injecting water and let it stand for a few minutes to observe the water surface. If it remains stable, no more water should be injected. Otherwise, continue to add water up to 5mm above it, and excessive injection should not be allowed to hinder the air circulation inside the shell. Finally, record the injection amount.

(2) Precautions

① During the lifespan of lead-acid batteries, the sealing valve should not be opened casually. The original sealing valve has a fixed opening and closing pressure. After being moved casually, the sealing valve does not open and close within the specified pressure range. It should be opened but cannot be opened, and if it cannot be closed, it loses its intended function. If the pressure reaches but fails to open, the battery casing may be damaged or burst. Frequent opening without reaching the valve opening pressure can accelerate the evaporation of the electrolyte and make it easy for external impurities to enter, both of which can damage the battery.

② Users without professional knowledge should not open the sealing valve casually to prevent acid mist from overflowing and damaging eyes or skin. Some electrolytes are mixed with certain high-efficiency and long-life additives. When the sealing valve is opened, some easily volatile components will evaporate in a short period of time, thereby changing the proportion of electrolyte components and reducing their efficiency.

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