A safety protection type lithium ion battery cover plate

Abstract

The invention discloses a safety protection type lithium ion battery cover plate, which comprises a cover plate body, a positive pole seat, a negative pole seat, a positive pole pressure ring, a negative pole pressure ring, a positive pole pole and a negative pole pole, and the positive pole pole is hollow The middle part is provided with a ring of explosion-proof thinning ring, and the positive pole pole passes through the positive pole seat, the cover plate body and the positive electrode pressure ring in turn, and the ring wall of the positive electrode pressure ring is provided with a through hole that partially overlaps with the explosion-proof thinning ring. In the invention, an explosion-proof thinning ring is provided on the positive pole, and it partially overlaps with the through hole on the positive pressure ring. When abnormal gas is produced inside the cell, the air pressure causes the explosion-proof thinning ring to be disconnected, and the heat released inside the cell passes through The explosion-proof thinning ring and the outer row of through holes prevent the explosion of the battery cell, and the disconnection of the explosion-proof thinning ring can prevent the further thermal runaway of the battery cell.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a safety protection type lithium ion battery cover plate. Background technique [0002] In recent years, countries around the world have continuously increased their policy support for new energy vehicles, which has brought about the rapid growth of the global electric vehicle market. In order to meet people's demand for cruising range, the energy density of batteries is increasing year by year, and at the same time, higher requirements are put forward for the safety and lightweight of battery structure design. In terms of the safety design of the cell structure, an explosion-proof valve is usually installed in the middle of the cover plate to improve the safety performance of the cell, but the liquid injection hole on the cover plate is set next to the explosion-proof valve, so that the excess electrolyte during the liquid injection process may It will corrode the explosion...

AI Technical Summary

Problems solved by technology

In terms of the safety design of the cell structure, an explosion-proof valve is usually installed in the middle of the cover plate to improve the safety performance of the cell, but the liquid injection hole on the cover plate is set next to the explosion-proof valve, so that the excess electrolyte during the liquid injection process may It will corrode the explosion-proof valve and affect the safety performance of the battery cell to a certain extent

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