There are six main reasons why lithium-ion batteries bulge.
1. Manufacturing issues, such as problems with the production environment or aging equipment, can lead to irregularities in the battery's metal coating and the infiltration of dust particles into the lithium-ion battery electrolyte. These factors can potentially cause lithium-ion battery packs to bulge during customer use, or even pose greater safety risks.
2. The key lies with the customer. If the customer handles the lithium-ion battery improperly, such as overcharging or over-discharging, or using it continuously in extremely harsh environments, it may cause the lithium-ion battery to bulge.
3. Overall quality issues in battery manufacturing: the metal electrode coating is irregular, and the manufacturing process is relatively rough.
4. Open circuit and short circuit faults cause chemical reactions that generate a large amount of heat. At the same time, the thin and long components can cause resonance, decompose and vaporize, and the battery will expand.
5. In addition, when the battery is used excessively, it will cause swelling because air is conductive to a certain extent. Therefore, if the period of use is too long, it is equivalent to the battery's initial direct contact and a prolonged short circuit.
6. This occurs when a battery has not been used for a long time and has not been properly stored. When it is exposed to air for an extended period without being used, and while it remains fully charged, the positive and negative terminals of the battery come into direct contact due to the conductivity of air, leading to a slow short circuit.
The key principle behind lithium-ion battery bulging lies in the intense chemical reaction that causes the battery's structure to approach a short circuit, generating a large amount of heat. This leads to the decomposition and vaporization of the electrolyte, causing the lithium-ion battery to bulge.
