Anti-explosion valve for power lithium ion battery

Abstract

The invention discloses an anti-explosion valve for a power lithium ion battery. The anti-explosion valve for the power lithium ion battery comprises an anti-explosion valve external thread, an anti-explosion valve internal thread, a spring and an anti-explosion piece are sequentially arranged inside the anti-explosion valve external thread from top to bottom, and a through hole is arranged in the middle of the anti-explosion valve internal thread. An anti-explosion piece washer is arranged inside the anti-explosion valve external thread and above the anti-explosion piece, and an anti-explosion valve sealing ring is arranged below the anti-explosion piece. The diameter of the spring is consistent with the outer diameter of the anti-explosion valve internal thread. A reducing port is arranged at the lower part of the anti-explosion valve external thread. An aluminium alloy foil is adopted as the anti-explosion piece which is 0.50-2mm thick. Nicks are arranged on the aluminium alloy foil. The anti-explosion valve for the battery has a simple structure, can be installed conveniently, prevents the overlarge internal pressure of the battery from bringing about influence on the safety property of the battery, and can timely release pressure to prevent explosion of the battery when the battery has short circuit, is overcharged, overdischarged or is under other abnormal situations.

Description

technical field [0001] The invention relates to an explosion-proof valve, in particular to an explosion-proof valve for a power lithium ion battery. Background technique [0002] Lithium titanate (Li 4 Ti 5 o 12 ) is a "zero-strain" electrode material with good cycle performance, a good charge-discharge platform and high-current charge-discharge performance, and also has good overcharge resistance, thermal stability and safety performance. New materials for ion power batteries. [0003] Through the existing technology, the lithium titanate is used as the negative electrode of the power lithium ion battery. During the use of the battery, the lithium titanate reacts with the electrolyte to generate HF, CO 2 , CO and other gases, causing the internal pressure of the battery case to increase, and even an explosion, which brings great hidden dangers to the safety of the battery. Therefore, it is necessary to install a battery explosion-proof valve. [0004] There are two ty...

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Problems solved by technology

[0005] In the process of realizing the present invention, the inventors found that the prior art has at least the following problems: the battery is discarded at the same time after the one-time explosion-proof valve is opened, which is an extremely good cycle performance compared to the new material lithium titanate of the lithium-ion power battery. big waste

Secondary degassing explosion-proof valve When abnormal conditions such as short circuit, overcharge, and overdischarge occur in the battery, the internal pressure of the battery rises sharply. This kind of explosion-proof valve cannot completely deflate instantly to achieve the purpose of explosion protection

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