Why does your lithium battery bulge and what is the reason?

Up to now, lithium batteries have been widely used in the market due to their high energy ratio and high safety. Although the 18650 battery does not have the higher safety of polymer batteries, it is more developed due to its higher safety. Early, so it is cheaper, and many manufacturers can produce it, which leads to unevenness. Sometimes the safety of lithium batteries is not guaranteed. In addition, if the use is improper or the production level is limited, there are still certain safety risks. Like a battery bulge. So why does the bulging phenomenon of lithium batteries occur?

1. Reasons for the swelling of lithium batteries

There are three main reasons for the swelling of lithium batteries:

The first type: the manufacturer's production process problems

Due to a large number of manufacturers, many manufacturers save costs, make the production environment harsh, use equipment and machinery that will be eliminated, etc., as a result, the coating of the battery is uneven, and dust particles are mixed in the electrolyte. All of these may make the lithium battery pack bulge when used by the user, and even cause greater danger.

The second type: daily use habits of users

The second is the users themselves. If the users use lithium battery products improperly, such as overcharging and over-discharging, or continuous use in extremely harsh environments, they may also cause swelling of the lithium battery.

The third type: long-term use and improper storage

If any kind of product is not used for a long time, the original performance will decrease. The battery will not be used for a long time, and then it will not be better preserved. Do not use it when exposed to the air for a long time, and the battery is fully charged. Since air is conducive to a certain extent, too long a long time is equivalent to direct contact between the positive and negative electrodes of the battery, and a chronic short-circuit occurs. Once short-circuited, it will heat up, and some electrolytes will decompose or even vaporize, resulting in bulging.