How to repair the car battery?

Open the battery cover and remove the 6 helmets.

Fill each well with distilled water with a syringe. If 1.28 standard electrolyte is added, the plate may burn out due to excessive acid solubility. For example, when we eat hot pot, why do we feel more and more salty? That is to say, when water evaporates, salt does not evaporate through water vapor. For the same reason, the acid in the battery will not be evaporated. What evaporated is water, so we just need to add about 20-30ml of distilled water to each well.

Allow the battery to stand still for half an hour after filling up, allowing the sponge around the plate to absorb enough water. Then use the resistor discharge to discharge all the electricity in the battery. If there is no resistance, you can use a 12v bulb instead. For example, motorcycle headlights and car turn signals can be used as long as they can discharge to 0v . How to judge that the battery is almost out of power, the cement resistor is discharged at the beginning of the resistor body, slowly and gradually not hot, then the battery will be out of power. If the light bulb is too direct, as long as the light is slowly turned off, it means that the battery discharge is over. The discharge time depends on the capacity of the battery when it is discharged. We can first maintain the battery when it is not powered. This can shorten the discharge time.

After the end of the discharge, the battery is charged, and the pulse charging method can be used under the condition that the pulse charging method can effectively remove the vulcanization of the electrode plate and increase the capacity of the battery. Nothing can be replaced by a car charger.

As shown in the figure: (charge the battery) Take pulse charging as an example.

After the charging is completed, use a syringe to withdraw excess water from each well. A total of 6 holes, completed step by step. Figure:

Cover the hat and lid to load the car.

Connect the positive and negative outputs of the repairer to the positive and negative poles of the battery, turn on the repairer, and repair the battery. The first repair time should be no less than 48 hours.

1, clean up

Before maintaining the battery, first clean the dust on the surface of the battery being repaired, and remove the stain and rust on the terminal.

2. Open the exhaust valve and observe the electrolyte inside the battery.

Pry open the glued or heat-sealed battery cover to expose the rubber exhaust valve of the maintenance-free battery. Carefully remove the exhaust valve and store it. Observe the internal condition of the battery. The electrolyte is added to the battery with 0.1% to 0.5% sulfuric acid, and there is just a flowing electrolyte on the battery. At the same time, check whether it is made of black impurities. If there are obvious black turbid impurities, the positive plate of the battery has been obviously softened, and the possibility of battery repair is relatively small. If there is no black turbidity, wait 4 hours and the water is well deep into the battery. If the battery capacity is reduced only because the deactivation time is long, and this step is not required, you should go directly to step 3 for pre-charging.

3, pre-charge

Charge the battery with constant voltage and current limiting. At the beginning, it is charged with a current of 0.1C to 0.25C. After 16.2V, the charging voltage is maintained by reducing the current until the charging current drops to 0.03C. Note that when charging, there will be gas carrying electrolyte from the vent hole. In order not to pollute the environment, the battery should be placed in an acid-resistant container. After charging, observe whether there is free acid inside the battery. If not, you need to make up 0.1% sulfuric acid solution until a little free acid appears. If there is free acid in each cell, use the pour and pipette to aspirate the visible free acid to keep the battery in a quasi-lean state. After the end of 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 below 10.8V, the battery may have an internal short circuit. The battery has no maintenance value.

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