1. Ventilation hole blockage

If the ventilation hole on the battery filling cover is blocked or not unobstructed, the gas generated during long charging time or high charging voltage will gradually accumulate, leading to increasing pressure inside the battery case and ultimately causing the battery to swell.

2. Charging time too long

As mentioned above, when the charging current of the battery is too high or the charging time is too long, a large amount of gas will be generated. In addition, excessive current or long charging time can also cause a rapid increase in electrolyte temperature, which can easily lead to battery swelling.

3. Sulfurization of battery plates

If the electrode plates of the battery undergo vulcanization, the single cell voltage and electrolyte temperature will rapidly increase during the charging process, and bubbles will be generated earlier and react violently, which can easily cause the battery to swell.

4. Continuous starting of the motor takes too long

When starting the motor, the battery needs to provide a large current to the motor in a short period of time, and the large starting current will inevitably cause violent chemical reactions inside the battery, accompanied by the production of gas. When the starting motor is used continuously for too long, it will intensify the production of gas, which increases the possibility of battery cracking.

5. The welding between the inner plate ears and poles of the battery and the busbar is not firm

When the pole ears and poles of the inner plates of the battery are not firmly welded to the busbar, if a high current is discharged, the welding point will ignite or burn due to thin or poor contact, which will cause sparks and ignite the hydrogen oxygen mixture produced by the battery, leading to battery explosion.

6. Excessive viscosity of electrolyte

If the viscosity of the electrolyte is high, it is easy to slow down the rate of infiltration into the pores of the electrode plate, and it will also increase the internal resistance, resulting in an increase in the voltage drop consumed on the internal resistance during discharge. This will cause a rapid increase in electrolyte temperature and generate a large amount of gas, resulting in an increase in gas pressure inside the battery and causing it to swell.

7. Too little electrolyte

I believe everyone knows that after using a battery for a period of time, the electrolyte will decrease, and at this time, it is necessary to add electrolyte or distilled water. After the electrolyte is reduced, overcharging can cause the battery to swell and even cause an explosion.

8. The charger is damaged

When the charger or generator on the engine is damaged, its current or voltage may fluctuate, which can easily lead to violent reactions in the battery, producing a large amount of gas and causing the battery to swell.

How to prevent battery swelling

The above reasons will cause the battery to expand. So, how to prevent the battery from expanding during daily work? Let's briefly discuss below.

1. Control voltage and current. As mentioned above, excessive voltage or current can easily cause battery expansion, so it is necessary to control the voltage and current well.

2. Try to control the charging time as much as possible, and do not let the charging time be too long to prevent overcharging.

3. Choose a better charger or regularly check the generator on the engine. Once a problem is discovered, please repair or replace it promptly to prevent battery expansion.

4. During the charging process, please ensure that the connection point is secure, as if the connection point is loose, sparks will be generated, which can pose a hidden danger to battery expansion.

5. Ensure timely and smooth passage of ventilation holes. During normal maintenance, please clean the impurities around the battery in a timely manner.

6. Pre check whether the battery case is cracked and whether the electrolyte leaks. This is because once the electrolyte leaks, it may seep into the cable or circuit, causing connection phenomena and sparks.

7. Promptly eliminate internal short circuits and sulfurization of electrode plates in the battery. Internal short circuits in batteries can generate sparks, igniting the mixture of hydrogen and oxygen. The sulfurization of electrode plates can cause a large amount of gas to be produced inside the battery. Therefore, it is usually necessary to check whether there is a short circuit inside the battery and whether there is sulfurization.

8. It is prohibited to ignite metal objects, such as cables on the positive and negative poles of batteries. This can easily cause a large amount of hydrogen and oxygen to explode in the air. In serious cases, it may even endanger personal safety.

When repairing electrical equipment, the flammable gas inside the battery should be removed first, as sparks or large currents are inevitably generated from the battery during electrical equipment repair, which is also a major safety hazard. 10. Timely check the amount and density of electrolyte. This will greatly protect the battery and prevent it from bulging.

11. When starting the engine, try to avoid continuous starting for a long time.

Methods to prevent battery explosions:

1. Control the amount of charge, but reduce the amount of gas escaping. Open flames are strictly prohibited in the charging room and good ventilation should be maintained.

During charging, the connection point must be secure and not spark due to looseness.

3. Low voltage and constant voltage charging is used during use, resulting in less gas generation.

4. Prevent battery case cracking and electrolyte penetration.

When disassembling and dismantling the battery while parking, the combustible gas mixture should be automatically discharged after parking. When disassembling, please remove the negative wire first, and then remove the positive wire. When installing batteries, the order should be reversed, otherwise the batteries may explode.

6. Keep the battery cover dry and clean.

7. Regularly check the ventilation holes on the small side of the battery to keep them unobstructed.

8. Control the liquid level of the battery to ensure that it is within the specified range and that the electrolyte does not overflow.

9. The battery terminal connection wire should have low contact resistance and high contact pressure, and the connection should be coated with Vaseline to isolate it from the external environment and prevent sparks from entering the battery and igniting flammable gases.

In the normal use of batteries, as long as the battery is regularly checked, problems are detected in a timely manner, and problems are eliminated in a timely manner, battery expansion is less likely to occur. Therefore, in daily maintenance, it is important to remember to check the battery.