Production method of anti-explosion valve sheet, lithium ion battery and anti-explosion cover plate of lithium ion battery

Abstract

The embodiment of the invention discloses a production method of an anti-explosion valve sheet of a lithium ion battery. The anti-explosion valve sheet which is integrally connected with a main cover plate is machined by repeated forging and pressing or hot melting treatment after forging. Compared with the conventional anti-explosion cover plate which is formed by adhering or welding the main cover plate and the anti-explosion valve sheet, the anti-explosion valve sheet produced by using the production method provided by the invention has the advantages of better gas tightness and anti-explosion property, higher production efficiency and lower production cost. The lithium ion battery with the anti-explosion valve sheet is safer and more reliable.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a production method for an explosion-proof valve plate of a lithium-ion battery, a lithium-ion battery and an explosion-proof cover plate thereof. Background technique [0002] Lithium-ion battery is a new type of chemical power source. It has the characteristics of small size, light weight, strong power, no memory, and environmental protection. It is widely used in wireless electronic devices such as mobile phones, cameras, video cameras, and PDAs. [0003] However, when the lithium-ion battery is used improperly, such as overcharge, short circuit, overheating, etc., gas will be generated inside the battery, causing the internal pressure of the battery to increase, and there is a possibility of explosion. In order to solve this technical problem, in addition to adding protective circuits to existing lithium-ion batteries, explosion-proof covers are often added to the batteri...

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Problems solved by technology

In the process of implementing the present invention, the inventor found that the existing explosion-proof cover plate has the following disadvantages: (1) The curing condition of the adhesive for bonding the main cover plate and the explosion-proof valve plate is relatively high, and the adhesive is in the organic After soaking in the electrolyte for a period of time, the adhesiveness will decrease, which will cause the edge of the explosion-proof valve plate to separate from the edge of the main cover plate, affect the sealing performance, and even cause leakage; (2) Connect the main cover plate and the explosion-proof valve by welding However, there are problems such as complex process, high cost and low production efficiency, and the contact surface between the main cover plate and the explosion-proof valve is not smooth, which is easy to puncture the explosion-proof valve, affecting the sealing performance and posing safety hazards

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