Overcharging causes all the lithium atoms in the positive electrode material to migrate into the negative electrode material, leading to the deformation and collapse of the originally full grid in the positive electrode. This is a major reason for the decrease in the capacity of lithium-ion battery packs. During this process, the number of lithium ions in the negative electrode increases, and excessive accumulation causes lithium atoms to grow into stump crystals, resulting in battery swelling.
The SEI film protects the negative electrode material, preventing structural collapse and extending cycle life. However, the SEI film is not static; it undergoes slight changes during charge and discharge, with some organic components experiencing reversible alterations. Over-discharge causes reversible damage to the SEI film, leading to the collapse of the negative electrode material and resulting in lithium-ion battery bulging.
If the charger used is not up to standard, it may cause the battery to bulge, or even lead to a safety accident or explosion.
The problem lies in the manufacturing quality of lithium-ion battery packs, including uneven electrode coatings and a relatively rough production process.
These three factors cause a violent reaction, similar to a short circuit, to occur inside the lithium-ion battery pack during use, generating a large amount of heat, which in turn leads to the decomposition and vaporization of the electrolyte, causing the battery to swell.
Why do lithium-ion batteries bulge?
Bulging caused by overcharging
Overcharging causes all the lithium atoms in the positive electrode material to migrate into the negative electrode material, leading to the deformation and collapse of the originally full grid in the positive electrode. This is a major reason for the decrease in the capacity of lithium-ion battery packs. During this process, the number of lithium ions in the negative electrode increases, and excessive accumulation causes lithium atoms to grow into stump crystals, resulting in battery swelling.
Bumps caused by over-amplification
The SEI film protects the negative electrode material, preventing structural collapse and extending cycle life. However, the SEI film is not static; it undergoes slight changes during charge and discharge, with some organic components experiencing reversible alterations. Over-discharge causes reversible damage to the SEI film, leading to the collapse of the negative electrode material and resulting in lithium-ion battery bulging.
If the charger used is not up to standard, it may cause the battery to bulge, or even lead to a safety accident or explosion.
