Lithium battery module and pressure relief device thereof

Abstract

The invention provides a lithium battery module and a pressure relief device thereof. The lithium battery module comprises a battery cell, a shell and an upper cover plate, wherein the pressure relief device is mounted on the upper cover plate, the upper cover plate is welded to the shell by using laser, the pressure relief device is an explosion-proof piece positioned at the middle position of the upper cover plate, and the explosion-proof piece is in sealing connection with a pressure relief hole in the upper cover plate through a sealant; electrode columns are arranged in the upper cover plate on two sides of the explosion-proof piece, and insulating adhesive pieces are mounted between the electrode columns and the upper cover plate; a zigzag groove is formed in the position of the center line of the explosion-proof piece, the depth of the groove is 0.010 to 0.015 mm, the width of the groove is 0.005 to 0.008 mm, and the explosion-proof piece is made from an elastic material; the battery cell comprises a positive electrode electrically connected with the positive electrode column, a negative electrode electrically connected with the negative electrode column, an electrolyte and a diaphragm positioned between the positive electrode and the negative electrode; the diaphragm is made from a ceramic material, the negative electrode is a carbon nanotube, the positive electrode is lithium iron phosphate, and the electrolyte is polymer gel electrolyte or lithium hexafluorophosphate. The lithium battery module has the beneficial effects that the lithium battery module has the advantages that pressure relief is facilitated and the explosion-proof piece can be reusable.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium battery module and a pressure relief device thereof. Background technique [0002] In recent years, with the continuous development of the battery industry, lithium-ion batteries have been widely used in electric vehicles, energy storage equipment and other fields due to their high energy density and environmental friendliness. However, the safety of lithium batteries is an important factor affecting its development. For example, when lithium-ion batteries are overcharged, over-discharged, short-circuited, squeezed, and other abuses, it will cause gas and fire inside the lithium battery / module. Even explode. [0003] The traditional method to solve these problems is to add a pressure relief valve on the top cover of the lithium battery / module. When the above situation occurs in the lithium battery, gas is generated inside, and when the internal gas pressu...

AI Technical Summary

Problems solved by technology

However, this type of explosion-proof disk is complicated to manufacture and cumbersome to install, so it is difficult to be widely used; and because it cannot be reset after pressure release, it is very easy to fail, so the service life of the traditional explosion-proof disk is too short

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