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Battery pot

A technology for battery cans and inner surfaces, which is applied to battery pack parts, battery boxes/coats, circuits, etc. It can solve problems such as high internal pressure of secondary batteries and damage to battery cans, and achieve the effect of improving the strength against internal pressure

Active Publication Date: 2007-12-05
WANOTEC JAPAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the heat generation expands the electrolytic solution or gas, causing a large internal pressure to be generated inside the secondary battery.
Sometimes the battery tank can't bear the internal pressure and is destroyed

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment

[0055] The following compares the breaking strength of the battery can according to the present embodiment and the breaking strength of a conventional design product.

[0056] Fig. 6 is a diagram for explaining the method of measuring the breaking strength in this example. In this example, an aluminum battery can with a length of 41 (mm), a width of 40 (mm), and a height of 4.9 (mm) was used. As shown in FIG. 6 , the battery can 1 is sealed by welding a metal cover 30 with a straw-shaped pressurizing port 31 to the upper opening of the battery can 1 . Next, compressed gas 32 was injected into the sealed battery can 1 from the pressurizing port 31 to increase the internal pressure in the battery can 1 , and the pressure when the battery can 1 was broken was measured.

[0057] FIG. 7 shows measurement conditions for the battery can of this example. In this embodiment, use R=1.0 (mm), r=0.6 (mm), the plate thickness of the short side wall 3 is 0.3 (mm), the plate thickness of t...

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PUM

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Abstract

A battery can is provided to improve proof stress against internal pressure of a battery so as to prevent the battery can from being broken by pressure lower than working pressure of a safety valve. A can-shape battery can has a bottom. An inside diameter(27 or 28) of a corner part having a curved surface becomes larger with getting away from a bottom part(4), wherein the corner part is adjacent to an end part of an inner surface of the bottom part and an end part of an inner surface of the can part(2 or 3). The battery can has a prismatic shape with a bottom. A material of the battery can is aluminum. The surface forming the inside diameter has a taper shape or approximately taper shape.

Description

technical field [0001] The present invention relates to a battery can having improved strength against internal pressure. Background technique [0002] Secondary batteries used in mobile phones, PDAs (Pocket Computers), notebook computers, etc. generate heat during charging and continuous use. Therefore, the heat generation expands the electrolytic solution or gas, resulting in a large internal pressure inside the secondary battery. In some cases, the battery can cannot withstand the internal pressure and is destroyed. However, as long as such an internal pressure is within a certain standard, the safety valve can be operated to prevent the battery from bursting (for example, Patent Document 1, Patent Document 2). [0003] However, batteries are being miniaturized and thinned year by year, and the performance of batteries must be improved. In order to improve battery performance, increasing the internal volume of a battery can is exemplified as a conventional means (for e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02B21D51/18B21D22/00
CPCY02E60/10H01M50/10H01M50/103H01M50/116
Inventor 清水义次
Owner WANOTEC JAPAN