Detailed explanation of the safety features of lithium-ion batteries

Lithium-ion batteries have been widely used in people's daily life, so its safety performance should definitely be the first assessment indicator of lithium-ion batteries. Regarding the assessment indicators for the safety performance of lithium-ion batteries, very strict standards are stipulated internationally. A qualified lithium-ion battery should meet the following conditions in terms of safety performance. (1) Short circuit: no fire, no explosion (2) Overcharge: no fire, no explosion (3) Hot box test: no fire, no explosion (constant temperature of 150℃ for 10min) (4) Needle: no explosion (use Ф3mm Nail penetration battery) (5) Plate impact: no fire, no explosion (10kg heavy object hits the battery from a height of 1M) (6) Incineration: no explosion (gas flame barbecue battery) how the safety features of lithium ion battery are realized ? In order to ensure the safe and reliable use of lithium-ion batteries, experts have carried out very strict and thorough battery safety design to achieve battery safety assessment indicators. (1) The automatic shut-off protection of the diaphragm at 135°C adopts the international advanced Celgard2300PE-PP-PE three-layer composite film. When the temperature of the battery reaches 120°C, the PE film holes on both sides of the composite film are closed, the internal resistance of the battery increases, and the temperature rises inside the battery slows down. When the temperature of the battery reaches 135°C, the PP film holes are closed, the battery is open and the battery is no longer Increase the temperature to ensure that the battery is safe and reliable. (2) Adding additives to the electro-liquid. When the battery is overcharged and the battery voltage is higher than 4.2v, the electro-hydraulic additives polymerize with other substances in the electro-liquid, the internal resistance of the battery is greatly increased, and a large-area open circuit is formed inside the battery. The battery no longer heats up. (3) Battery cover composite structure The battery cover adopts a scored explosion-proof structure. When the battery heats up, part of the gas that occurs during the internal activation of the battery expands, the internal pressure of the battery increases, and the pressure reaches a certain degree of score cracking and deflation. (4) Various environmental abuse tests Carry out various abuse tests, such as external short circuit, overcharge, acupuncture, plate impact, incineration, etc., to investigate the safety performance of the battery. At the same time, the battery is subjected to temperature shock tests and mechanical performance tests such as vibration, drop, and shock to investigate the performance of the battery in the actual use environment. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What are the advantages of all-solid-state lithium-ion batteries compared to liquid lithium-ion batteries