Closed type battery

A kind of airtight battery technology, applied in the direction of battery, battery pack parts, battery box/outer, etc., can solve problems such as cracking, and achieve reliable cracking effect

Inactive Publication Date: 2013-10-23
HITACHT MAXELL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, depending on the type of battery, the size and plate thickness of the battery case are also different, so even with the above-mentioned shape of the cleavage line, the cleavage groove may not be broken according to the pressure inside the battery case.

Method used

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Embodiment Construction

[0039] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same symbols are assigned to the same or corresponding parts in the drawings, and descriptions are not repeated.

[0040] (overall composition)

[0041] figure 1 It is a perspective view showing a schematic configuration of a sealed battery 1 according to an embodiment of the present invention. The sealed battery 1 includes a bottomed cylindrical exterior can 10 , a cover plate 20 covering the opening of the exterior can 10 , and an electrode body 30 accommodated in the exterior can 10 . By attaching the cover plate 20 to the exterior can 10, the hollow cylindrical battery case 2 having a space inside is configured. In addition, in the battery case 2 , in addition to the electrode body 30 , a non-aqueous electrolytic solution (hereinafter simply referred to as an electrolytic solution) is sealed.

[0042] The electrode body 30 is a wound electrode body ...

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Abstract

The invention provides a closed type battery. A cracking groove formed by a curve is disposed on a side surface of a battery housing, and the cracking groove alternately connects a first bending portion and a second bending portion. The first bending portion bends towards a direction in a dentritic manner, and the second bending portion bends towards a direction which forms an angle of more than 90 DEG with the direction of the first bending portion in a dentritic manner. The following cracking groove is obtained in the closed type battery, that is, even when dimensions of the battery housing and thickness of boards are different, the cracking groove crazes more reliably corresponding to internal pressure of the battery housing. The closed type battery is provided with a hollow columnar battery housing in which electrode bodies and electrolyte are sealed. On the side surface of the battery housing, the cracking groove of a cracking line crossed with a ridge is formed. Groove depth of the cracking groove is lower than 1.6%/mm, and the groove depth is obtained by dividing a ratio of thickness of remaining wall thickness part and board thickness of the battery housing by width of the battery under the condition that the side surface of the battery housing is observed from a normal direction.

Description

technical field [0001] The present invention relates to a sealed battery in which a cleavage groove is formed on a side surface of a battery case enclosing an electrode body and an electrolytic solution, and the cleavage groove is formed when the pressure inside the battery case exceeds a threshold value. Background technique [0002] Conventionally, a sealed battery is known in which a cleavage groove is formed on the side surface of the battery case, and the cleavage groove is broken when the pressure inside the battery case exceeds a threshold value. In such a sealed battery, for example, as disclosed in Patent Document 1, on the side surface of the battery case, it intersects with the ridge line (ridge line) of the convex portion formed when the battery case expands due to an increase in internal pressure. position, a crack groove is formed. As a result, when the pressure inside the battery case exceeds the threshold value, the deformation of the battery case will cause...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M2/12
CPCY02E60/12Y02E60/10H01M2200/20H01M50/3425H01M50/10H01M50/572H01M50/578
Inventor 阿部浩史前园宽志山本真由美藤原义久
Owner HITACHT MAXELL LTD
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