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Lithium battery safety valve pressure relief device

A technology of pressure relief device and safety valve, which is applied in lithium batteries, battery pack parts, non-aqueous electrolyte batteries, etc., can solve problems such as disasters, and achieve the effect of improving safety and reducing internal pressure.

Active Publication Date: 2022-05-31
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the internal pressure of the battery reaches the opening threshold of the pressure relief valve, the thermal runaway decomposition reaction of the battery has begun, especially the generation of combustible gas. major disaster

Method used

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  • Lithium battery safety valve pressure relief device
  • Lithium battery safety valve pressure relief device
  • Lithium battery safety valve pressure relief device

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Embodiment Construction

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will be combined with the accompanying drawings in the embodiments of the present invention Figure 1 to Figure 4 , clearly and completely describe the technical solutions in the embodiments of the present invention, obviously, the described embodiments are part of the embodiments of the present invention, but not all of them. Based on the implementation manners in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0038] Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the implementation manners in ...

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Abstract

According to the lithium battery safety valve pressure relief device, in the device, a valve body comprises an inner cavity and an exhaust port formed in the bottom of the valve body, the exhaust port communicates with the inner cavity, and a shape memory alloy sleeve is arranged in a first sleeve and is in interference fit with the first sleeve; pre-tightening force is generated between the wall surfaces of the shape memory alloy sleeve and the first sleeve, the second sleeve is arranged around the first sleeve and located in the inner cavity, the top end of the second sleeve is higher than the top end of the shape memory alloy sleeve, the second sleeve is provided with a second exhaust hole, and the end cover is slidably connected with the second sleeve and located in the inner cavity and fixedly connected with the shape memory alloy sleeve; and the reset spring is fixedly connected between the first sleeve and the end cover and is fixedly connected with the shape memory alloy sleeve, so that the end cover axially moves up and down in the second sleeve to drive the shape memory alloy sleeve to move up and down, and the first exhaust hole and the second exhaust hole form an on-off communication air path.

Description

technical field [0001] The invention relates to the technical field of lithium battery safety, in particular to a lithium battery safety valve pressure relief device. Background technique [0002] Lithium batteries have been widely used in power energy, energy dispatching and storage and other fields due to their advantages such as high working voltage, large specific energy, long cycle life, and small self-discharge. However, overcharge and overdischarge, short circuit and abuse of lithium batteries will cause thermal runaway of the battery. When thermal runaway occurs, the heat generated inside the battery will increase rapidly, causing the battery temperature to rise rapidly. If the battery temperature is too high, the internal electrodes and electrolytes will react. Internal substances such as electrolyte decompose, and a large amount of gas is generated in a short period of time, causing the internal pressure to rise sharply, which further leads to deformation of the ba...

Claims

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Application Information

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IPC IPC(8): H01M50/333H01M10/052
CPCH01M50/333H01M10/052Y02E60/10
Inventor 江智元李洪波屈治国张剑飞魏进家
Owner XI AN JIAOTONG UNIV
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