The Top 4 main reasons of power banks swelling

The swelling and deformation of the battery mainly results from the increase in internal pressure. The main reasons for this are:

(1) The safety valve has either opened with too much pressure, or it has become blocked. When the internal pressure reaches a certain level, the valve cannot open normally. In such cases, the battery bulges and deforms.
(2) The floating charge voltage is set too high, and the charging current is large, causing gas to be produced more quickly on the positive plate. If the gas cannot recombine in time on the negative electrode, the temperature inside the battery rises quickly. This increase in temperature causes pressure to build up, which makes the battery bulge and deform.

(3) During the charging process, especially when the batteries are arranged in series, if overcharging the battery group occurs, the internal gas may not recombine properly, resulting in bulging.
(4) Because the VRLA battery is a poor liquid design, it leaves a reserved escape route for gas. When there is a rich liquid phenomenon, it will obstruct the diffusion of the generated gas to the negative electrode, reducing the recombination rate of the gas and causing an increase in internal pressure.
Bulging is a precursor to major problems and is not recommended for use. Continued use may lead to short circuits, overheating, smoking, burning, and other disastrous consequences.
So, how can we avoid safety hazards such as bulging and overheating when using power banks? The following six tips can help minimize the risks:

1. Static electricity during cleaning:

Regularly clean the power bank and the charging port with anti-static cloth or brush. Do not use dry cloth (static charge)!

2. Waterproof and moisture-proof:

As an electronic product, it is prone to corrosion or oxidation of its internal electronic components if it accidentally comes into contact with water or is exposed to humid air for a long time.

3. Anti-fall and shockproof:

The internal components of a Mobile Power Bank are not strong enough to withstand accidental impact. Do not drop, hit, or shake the power bank. Rough handling can damage the internal circuit board.

4. Anti-cold and heat-resistant:

High temperatures can shorten the lifespan of electronic components and cause some plastic parts to deform or melt. In a cold environment, mobile power banks can generate moisture, which can damage circuit boards.

5. Avoid using harsh chemicals:

Do not use harsh chemicals, cleaning agents, or strong detergents to clean the power bank. Use a small amount of anhydrous alcohol on cotton to wipe the surface stains off the power bank.

6. Proper charging and discharging:

If you do not use the power bank for a long time, it is recommended to discharge and charge it once a month. This helps to maintain the best condition of the internal battery and extend its lifespan.

In summary, a power bank contains an embedded battery and, in addition to the quality factor, users must strictly follow the operating instructions to ensure safety. Once swelling occurs, stop using it immediately to ensure safety.