A lithium ion battery

Abstract

The invention discloses a lithium ion battery, comprising an electrical core and a housing with an intracavity. The electrical core is arranged inside the intracavity. The housing comprises a cover plate including a first sheet metal, wherein the first sheet metal is equipped with at least a first through hole and a second through hole that are penetrating through an upper surface and a lower surface, and the first through hole is equipped with a cathode column therein, and an insulating part is arranged between the first through hole and the cathode column. The cover plate also includes an explosion-proof apparatus, which comprises a bursting disk sealing the second through hole; an explosion-proof wire is arranged on the bursting disk and will break to expel gas when an air pressure in the electrical core reaching a preset value. In a detailed implementation of the invention, the explosion-proof apparatus is arranged on the second through hole and comprises the bursting disk; the bursting disk seals the second through hole and is also equipped with an explosion-proof wire, so as to realize explosion proofing and avoid electrical core failure caused by impaling or breaking of the bursting disk due to thin film thickness or low mechanical strength during production, transportation and usage.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a square lithium ion battery capable of providing safety protection. Background technique [0002] In lithium-ion batteries, in addition to the positive and negative electrodes, electrolyte and separator paper, the shell and cover that store the various reaction components of the lithium-ion battery are also very important components. As an effective component, in addition to providing storage functions, It will also provide the function of electrode extraction for lithium-ion batteries, and at the same time provide certain help for the safety of lithium-ion batteries. [0003] The materials used for the battery case and cover plate mainly include: stainless steel or nickel-plated steel, aluminum alloy, etc. At present, batteries that use stainless steel, nickel-plated steel, or aluminum alloy as storage media often use explosion-proof wires or explosion-proof membranes on the shell and ...

AI Technical Summary

Problems solved by technology

However, during the processing of the explosion-proof wire, there are many influencing factors, and it is generally difficult to ensure the pressure consistency when it ruptures. It is generally used in the low-end market, and the explosion-proof membrane processing technology and related patents are mainly controlled by some manufacturers in Japan and South Korea; secondly, In order to achieve the explosion-proof function of the explosion-proof line and the explosion-proof membrane, the mechanical strength near the explosion-proof line or the explosion-proof membrane is mainly reduced, so that the treated specific position is first ruptured when it is subjected to a certain pressure, and the negative impact is the explosion-proof membrane. Or the explosion-proof wire is easy to be pierced or damaged during production, transportation or use due to its thin thickness or low mechanical strength, resulting in battery cell failure

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