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Safety valve for lithium ion cell

A lithium-ion battery and safety valve technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of difficult to ensure reliable action, difficult to accurately control the depth of the notch, and poor reliability, so as to avoid explosion accidents. Effect

Inactive Publication Date: 2005-10-26
汤国江
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the requirements for processing accuracy are high, because the depth of the notch is difficult to control accurately, no matter whether it is too shallow or too deep, it will not have the effect of safety protection, and it is difficult to ensure its reliable operation.
Therefore, this method is less reliable

Method used

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  • Safety valve for lithium ion cell
  • Safety valve for lithium ion cell

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Experimental program
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Effect test

Embodiment Construction

[0013] Such as figure 1 , figure 2 As shown, the lithium-ion battery safety valve of the present invention includes a battery upper cover 14, which is connected in a sealed shape with the mouth of the battery tank 15, and the middle part is provided with a valve seat 18, which is connected to the battery upper cover. The 14 rooms are connected together in a sealed shape. Said valve seat 18 is cylindrical and has a central hole 10 processed thereon. The diameter of the upper section of the central hole 10 on the valve seat 18 is larger than that of the lower section, so that an annular step 19 is formed on the inner side wall thereof. The section of central hole 10 below the annular step 19 is shorter in length, while the section of central hole 10 above the annular step 19 is longer in length. On the annular step 19, a valve plug 3, a spring 5 and a pressing piece 13 are arranged in sequence from bottom to top. Wherein the valve plug 3 can be either a spherical valve plug...

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Abstract

This invention discloses a safety valve mounted on the orifice of the Li ionic battery shell including a battery top cover with a seat at the middle sealed-in with the cover. A central hole is set on the seat, and the diameter of the upper section is greater than that of the lower to form circle stage at the middle, a valve plug, a spring and a wafer are set in the central hole from the bottom to the top on the circle stage. A central hole is on the wafer, its edge is sealed-in with the central orifice of the valve seat, a rubber film is on the wafer, its surrounding is sealed-in with the wafer, a cover with an air gate at the center is set on the rubber film and downward center is set at the air gate, the peak of the center is in a gap with the film.

Description

(1) Technical field [0001] The present invention relates to a gas valve. Specifically, it is a safety valve for lithium-ion batteries installed at the mouth of the lithium-ion battery case. (2) Background technology [0002] As we all know, when a lithium-ion battery is short-circuited, overcharged, or over-discharged during use, the current will run out of control, which will increase the temperature of the battery. When the temperature rises to a certain height, such as 75-95°C, the substances inside the battery, such as electrolyte, will decompose and generate gas. As the pressure of the gas increases, the battery case expands and deforms. In severe cases, the battery case may burst. Therefore, whether it is an aluminum-cased lithium-ion battery or a stainless-steel-cased lithium-ion battery, a safety valve is installed at the mouth to avoid the above-mentioned problems. At present, the safety valves used in lithium-ion batteries mainly have the following two forms. ...

Claims

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Application Information

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IPC IPC(8): H01M2/12
CPCY02E60/12Y02E60/10
Inventor 许锷铭吴德喜曹正平顾敏敏
Owner 汤国江
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