Lithium battery electric core explosion prevention and power-off protection device and producing method

Abstract

A lithium battery electric core explosion prevention and power-off protection device and a producing method. The device comprises an electric core casing, a metal top cover, a metal rupture disc, a metal vent hole plate, an annular insulation spacer, an annular sealed ring and an electric core tab. The explosion-proof construction are arranged on the rupture disc and the vent hole plate and comprises a V-shaped ring groove on the vent hole plate and a ring groove on the rupture disc. The rupture disc and the vent hole are connected through multi-point connection mode. The method comprises: stamping molding of top cover, rupture disc, vent hole plate and insulation spacer, injection moulding of sealing ring at high temperature, edging of rupture disc and laser welding of rupture disc and vent hole plate and sealing connection of parts and with the electric core. When the inner pressure of the electric core is higher than the preset value, an upward pressure through the vent hole lifts the recess of the rupture disc and cuts off the V-shaped ring groove of the vent hole plate and switches out the circuit by separating from the rupture disc. If the inner pressure enhances continuously, the ring groove of the rupture disc is cut off for pressure relief.

Description

【Technical field】 [0001] The invention relates to a lithium ion battery, in particular to an explosion-proof and power-off protection device for a lithium battery cell which provides safety protection for the lithium battery. 【Background technique】 [0002] In recent years, due to the miniaturization, portability and portability of electronic devices such as cameras, electric tools, and notebook computers, the drive power for these electronic devices is also developing in the direction of high capacity, high safety and portability. Lithium-ion steel case fully enclosed batteries are increasingly widely used due to their high capacity and excellent load characteristics. [0003] Lithium-ion batteries are the power storage components of lithium batteries. When they are in use, due to factors such as charger failure, abnormal gas will be generated with the internal chemical reaction of the battery, resulting in excessive internal pressure of the battery, resulting in battery ex...

AI Technical Summary

Problems solved by technology

The existing protection devices have disadvantages such as poor reliability, small withstand voltage range, complex structure, and high processing requirements.

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