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Temperature controlled safety device in use for batteries, and method, and batteries with safety device being installed

A safety device and battery temperature technology, applied to battery components, electrical components, circuits, etc., can solve the problems that are difficult to control and ensure the stability and consistency of the battery pressure relief value, and the safety factor cannot be guaranteed, so as to achieve consistency , the effect of ensuring safety

Active Publication Date: 2006-07-05
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This form of safety device can play a certain role in protecting the battery, and it is simple and easy to implement, but its disadvantage is that due to the influence of the material used and processing strength, precision, tolerance and other conditions, the pressure error can sometimes be as high as ±40%, so It is difficult to control and ensure the stability and consistency of the battery pressure relief value, and the safety factor cannot be guaranteed

Method used

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  • Temperature controlled safety device in use for batteries, and method, and batteries with safety device being installed
  • Temperature controlled safety device in use for batteries, and method, and batteries with safety device being installed
  • Temperature controlled safety device in use for batteries, and method, and batteries with safety device being installed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] According to the law of battery temperature rise under battery abuse conditions, a safe temperature point can be selected to manufacture alloys with corresponding melting points.

[0033] Using LiCoO 2 Make a lithium-ion battery as the positive electrode and carbon microspheres as the negative electrode. According to the structure of the battery, if the battery temperature rises under abuse conditions, when the battery temperature exceeds 58°C ± 2°C, the internal pressure of the battery will be too high to cause danger. According to this regularity, the temperature for controlling the cracking of the safety device is set to 58°C to manufacture a medium-low temperature fusible alloy with a corresponding melting point of 58°C, and the composition and weight percentage of the alloy are determined according to the melting point of the alloy to be made. Its composition and weight percentage are as follows: Bi 49%, In 21%, Pb 18%, Sn 12%.

[0034] Melt the above-mentioned a...

Embodiment 2

[0037] Example 2 is the same as Example 1 except that the alloy melting point, alloy composition and weight percentage are different from Example 1.

[0038] The melting point of the alloy is 108°C;

[0039] The composition and weight percentage of the alloy are as follows: In 52%, Sn 46%, Zn 2%.

[0040] In the destructive test, when the temperature of the battery rises to the melting temperature of the safety device (that is, the melting point of the alloy is 108°C), the safety device melts and releases the internal pressure of the battery, but the battery does not explode or catch fire.

Embodiment 3

[0042] Example 3 is the same as Example 1 except that the alloy melting point, alloy composition and weight percentage are different from Example 1.

[0043] The melting point of the alloy is 142°C;

[0044] The composition and weight percentage of the alloy are as follows: In 98%, Zn 2%.

[0045] In the destructive test, when the temperature of the battery rises to the melting temperature of the safety device (that is, the melting point of the alloy is 142°C), the safety device melts and releases the internal pressure of the battery, but the battery does not explode or catch fire.

[0046] In the present invention, the temperature range for controlling the cracking of safety devices is 50-200°C. Alloys at other temperatures other than those in Examples 1, 2, and 3 can be formulated according to the alloy components proposed in the present invention, and details will not be repeated here. Therefore, embodiments 1, 2, and 3 are just three examples, and do not limit the present...

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Abstract

Fusible alloys in middle and lower temperature with ingredient including one or more from Ga, In, Sn, Bi, Pb, Cd and Zn are adopted as materials of temperature controlled safety device in use for batteries. Ingredient and weight proportioning of alloy are determined based on temperature of controlling crack of safety device. Though method of pressed work or foundry, alloys are fabricated to temperature controlled safety device in use for batteries. When temperature of main body of battery reaches to melting point of the alloy, fusible alloy is melted. Breakage of safety device releases inner pressure so as to guarantee safety of battery. The invention is suitable to Li-ioníóNi-MHíóNi-Cd etc. Electrochemical battery. Features are: easy preparation and low cost.

Description

technical field [0001] The invention belongs to the application technical field of battery explosion-proof devices, and in particular relates to a battery temperature control safety device, a method thereof, and a battery equipped with the safety device. Background technique [0002] In recent years, batteries with high capacity, high specific energy, and high specific power have been greatly developed. Especially lithium alkali metal oxides (such as LiCoO 2 , LiMn 2 o 4 , LiNiO 2 etc.) as the positive electrode and the carbon material or alloy material as the negative electrode non-aqueous electrolyte lithium-ion battery began to be widely used in various portable electrical appliances and popularized in electric vehicles. The safety of the battery is also widely concerned by people, and it is extremely urgent to solve the safety problem of the battery. [0003] At present, the safety devices used in most batteries use pressure as the operating control condition, that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/34H01M2/12H01M50/342H01M50/375
CPCY02E60/12Y02E60/10
Inventor 卢世刚金维华
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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