Why does the car battery heat up and emit sulfuric acid after being charged?

Introduction Why does the car battery heat up and sulfuric acid leaks after charging? The reasons why the car battery heats up and sulfuric acid leaks after charging are: 1. The liquid added to the battery exceeds the upper limit of the battery liquid level; 2. The lo

Why does the car battery heat up and emit sulfuric acid after being charged?

The reason why the car battery heats up and sulfuric acid leaks out after charging is

1. The fluid added to the battery exceeds the upper limit of the battery fluid level;

2. During the charging process, the liquid in the battery boils, and as long as the original liquid level is within the upper limit, it will not overflow;

3. During use, you should frequently check whether the battery fluid is between the upper limit and the lower limit. If it is below the lower limit, battery fluid will need to be added.

Acid battery:

Acid storage battery A battery using an acidic aqueous solution as the electrolyte. A practical acid battery is a lead acid battery. Its positive electrode is lead dioxide, its negative electrode is sponge lead, and its electrolyte is an aqueous solution of sulfuric acid. The separationsurs (separators) use microporous rubber separators and microporous plastic separators according. Different types of lead acid batteries. Or other materials, the battery shell is made of hard rubber, engineering plastics, fiberglass and other materials. Lead-acid battery reaction equation (see formula in image). The aqueous solution of sulfuric acid electrolyte participates in the battery reaction, and the discharge products of the positive and negative electrodes are lead sulfate. The positive electrode of the battery is of two types: paste type and tubular type, and the negative electrode has a copper alloy grid. and copper grille. Lead-acid batteries used for ship propulsion are equipped with an electrolyte stirring system to standardize the electrolyte in the upper and lower parts of the battery and eliminate electrolyte stratification. In order toreduce heating when charging large batteries, the battery is equipped with a water cooling system. The main advantages of lead-acid batteries are high operating voltage (2.0V), wide operating temperature, good high and low rate discharge performance, abundant sources of raw materials and low price. Its disadvantage is that its energy density is low, which makes it larger in size and weight.

A: The seal between the upper cover and the lower tank is not good or the sealing glue cracks due to collision;

Two: Safety valve is leaking acid;

Three: Acid is leaking at terminal;

Four: Acid is leaking in other parts.

When the battery is used, the output current is too large and the continuous discharge time is too long, resulting in excessiveBattery temperature increases and leaks may occur if the battery is discharged. a small current for a long time, there will be leakage, which is lower than the standard. If the scale voltage continues to operate, a leak may occur.

The liquid leaking from the battery is a highly alkaline hydroxide compound, which is very corrosive and can cause corrosion of the battery case blades, poor contact or lack of conduction . It is necessary to prevent battery leakage. corrode electrical appliances. The effective method is not to overuse the battery and remove the battery from electrical appliances that are not used for a long time.

Detailed information:

Battery leak inspection and treatment methods:

Perform a visual inspection first, find the location of the leak'acid.

Remove the cover and check if there is evidence of acid leaking around the safety valve, then open the safety valve and check if there is electrolyte leaking inside the battery.

After completing the above work, if no abnormalities are found, carry out an airtightness check (put it in the water, inflate it and put it under pressure, and observe if bubbles are generated and come out of the battery. If there are bubbles, it means there is an acid leak.

Finally During the charging process, observe whether any electrolyte flows out. If so, this indicates production reasons. During the charging process, any leaking electrolyte must be drained away.

Baidu Encyclopedia - Car Battery

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