Battery charged in to around 80% of capacity into the high voltage charging area, then, on the positive plate first oxygen precipitation, oxygen through the partition of pore, arrived at the cathode, REDOX reaction on the negative plate. Generated when the reaction heat, when the charge capacity reached 90%, oxygen generating rate, the cathode begin to produce hydrogen gas. The increase in gas storage battery internal pressure more than open valve, pressure relief valve opens, the gas overflow, the final performance for water loss. As the battery with the increase of number of circulation water to reduce gradually, the battery in the following situation.

　　(1) oxygen "channel" become clear, the positive of oxygen is easy to achieve the cathode through "channel".

　　(2) the heat capacity decreases, and the heat capacity of the largest in the storage battery is water, water loss, heat capacity battery * * decreases, and the heat generated by the battery temperature rise quickly.

　　(3) after the water loss of battery shrinkage occur Chinese super fine glass fiber clapboard, make its adhesion with the positive and negative plate, internal resistance increases, calorific value in the process of charging and discharging. Through the above process, battery internal heat only after the battery slot cooling, such as heat dissipation is less than the heat, the temperature rise. Temperature rise, reduce battery formation of gas, gas chromatography, the positive amounts of oxygen through the "channel" in the cathode surface reaction, send out a lot of heat, the temperature rise quickly, and form a vicious circle, known as "thermal runaway. Final temperature can reach 80 ℃ above, the deformation will happen.

　　Fault inspection and handling: a set of battery (3) only deformation at the same time, should do voltage check first. If the voltage is essentially normal, but should also measure the single voltage, short-circuit, determine whether if there is no short circuit shows deformation is caused by the thermal runaway of charging, should check the charger of the parameters. Such as high voltage (above 44.7 V), no over charging protection, should replace the charger.

　　A set of battery (3) only in only 1 or 2 deformation only, have the following several possible.

　　(1) the battery charged, caused some charging battery overcharge caused deformation. Charged inconsistent reasons, there may be the single short circuit, also may be self-discharge.

　　(2) battery plate irreversible sulfate, internal resistance increases, the charging hot deformation.

　　(3) a cell attachment is negative short-circuit hot deformation. The battery not deformation, should check the discharge capacity and the characteristics of self-discharge, without exception, do not belong to the battery problem.

　　Solve the deformation of battery measures are as follows.

　　(1) to ensure no leakage under the premise of as far as possible more fluid, to prolong or avoid the thermal runaway.

　　(2) avoid internal short circuit or micro short circuit, and with the tendency of micro short circuit occurred.

　　(3) in use process should prevent the occurrence of a discharge, do sufficient electricity storage.

　　(4) strict inspection charger, can not have serious overcharge phenomenon.

　　(5) charging at high temperature, it is necessary to guarantee the battery heat dissipation is good. Cooling measures should be taken or shorten the charging time method, otherwise should stop charging.