Porous plate and current blocking structure of lithium-ion battery

Abstract

The invention discloses an orifice plate. An upper ring score and a lower ring score are respectively arranged on the upper surface and the lower surface of the orifice plate. The upper ring score and the lower ring score are coaxial but have a diameter of different. At the same time, the current blocking structure of the lithium-ion battery is disclosed, which includes a fixedly connected orifice plate and an explosion-proof sheet, and an upper ring score and a lower ring score are respectively formed on the upper surface and the lower surface of the orifice plate. The upper and lower ring scores are coaxial but have different diameters. In the orifice plate of the present invention, the interval 6 of the overlapping portion of the upper ring score and the lower ring score is used as a CID structure, and the processing is simple. The current blocking is realized by the current blocking structure on the orifice plate perpendicular to the direction of the battery cover, that is, the tearing of the spacer 6 . The reduction of the tolerance dependence of the upper ring notch and the lower ring notch, first of all, greatly reduces the processing cost, and the stability of the product, especially the stability of the explosion-proof performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery preparation, in particular to an orifice plate, an explosion-proof sheet and a current blocking structure of a lithium-ion battery cover. Background technique [0002] Due to a series of advantages such as high working voltage, high energy density, and long cycle life, lithium-ion batteries have quickly become the development trend of secondary batteries. At present, lithium-ion batteries are widely used in mobile communication equipment and portable electronic equipment, and have broad application prospects in special fields such as aviation, national defense, and military industry. Rechargeable secondary lithium-ion batteries have become an important renewable energy source to overcome the problems of energy crisis, resource shortage, and environmental pollution. [0003] However, as a chemical energy storage device, the lithium-ion battery’s energy storage mechanism determines that...

AI Technical Summary

Problems solved by technology

Traditionally, the function of CID is achieved by the fracture of the welding point between the battery cover hole plate and the explosion-proof plate or the single-layer notch fracture on the hole plate. The characteristics of these two solutions are simple implementation, but the disadvantage is The former requires high welding precision, while the latter requires very precise notch depth. A slight deviation will cause a significant change in the disconnection force of the CID, thereby affecting battery safety.

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