Battery swell or Swollen causes are mainly the following:

1.foreign objects piercing the battery:

battery in the turnover or loading process, the battery body is subject to external sharp objects piercing

the outer packaging aluminum-plastic film, resulting in battery leakage, the battery will have a pungent

smell of electrolyte, the battery internal electrolyte and moisture in the air irreversible side reaction

caused by the battery bulging.

2.battery sealing bad:

when the battery in the sealing of the sealing area is too small, sealing the inner layer of PP layer

excessive melting, sealing thickness is large, sealing the melt glue bad, etc. will cause the battery cell

sealing the edge of the internal corrosion or direct sealing can not be caused by the moisture in the air to

enter the interior of the battery core, resulting in battery core leakage of bulging packs.

3.Battery short circuit:

when the battery internal structure of the damage, such as the battery was severely extruded or collision,

as well as the battery is made of diaphragm with trachoma, positive and negative pole piece burrs, etc.

will cause the battery internal short circuit, the battery internal short circuit, the battery internal

temperature will rise dramatically, when the temperature reaches a certain level, the diaphragm will

appear shrinkage, positive and negative poles are in direct contact with the short circuit is further serious,

and eventually the battery will appear! The battery will eventually bulge and catch fire.

4.Battery overcharge or overdischarge:

when the battery protection plate failure, continuous charging of the battery, when the battery voltage

exceeds 4.8V, the battery internal electrolyte will be oxidized and decomposed, resulting in non-

eliminable gases, resulting in the battery bulging, if it is still continuous charging, the battery will

eventually short-circuit fire; continuous discharge of the battery will also cause the battery bulging.

5. Excessive battery PCM self-consumption：

single-cell electrical performance is normal, the battery’s PCB protection board from the power

consumption is large, the battery in the completion of the pack, the PCB self-consumption of power for

single-cell relative to the external load, after a long period of time on the shelf (such as the storage time

and transportation time) the battery cell persistent discharge, the voltage decreases until the battery PCB

appeared to be overdischarged appear bulging.

6. Excessive self-consumption of power in terminal equipment/product:

Battery all functions are normal, the customer in the installation welding process with power equipment

self-consumption of power bias, the battery installed in the case of not working due to the self-

consumption of power caused by the equipment sustained discharge, the voltage decreases until the

battery PCB appears to be overdischarged bulging.

7. Battery damage due to careless transportation:

Batteries may also be damaged during transportation or at work by accidental drops, knocks, shocks, or

under heavy pressure, and when bulging and swelling of the battery is visible to the naked eye, it is only

proper to dispose of it properly. Never touch it with sharp objects.

How shuold we do to prevent battery bulging?