Closed square cell

A prismatic battery and battery case technology, applied in battery pack parts, battery cover/end cover, battery box/jacket, etc., can solve the problems of uneven working pressure of cracked bent pieces and low reliability of cracked bent pieces , to achieve the effect of stable working pressure, high cracking, and reducing deviation

Inactive Publication Date: 2006-05-24
HITACHI MAXELL ENERGY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the working pressure of the cracking bends of each battery is uneven, and there is a problem of low reliability of the cracking bends

Method used

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  • Closed square cell
  • Closed square cell
  • Closed square cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Figure 1 to Figure 4 Example 1 showing a lithium ion secondary battery as a sealed prismatic battery of the present invention, such as Figure 4 As shown, it is equipped with: a bottomed square battery case 1 with long left and right lateral openings on the top, an electrode body 2 and a non-aqueous electrolyte contained in the battery case 1, and the top of the opening of the battery case 1 is closed. The horizontally long cover 3, the plastic insulator 5 disposed inside the cover 3, and the like. The battery case 1 is formed by deep-drawing a plate made of aluminum or aluminum alloy to make a thin piece with vertically long top and bottom.

[0030] In the electrode body 2 , a separator made of a polyethylene microporous film is interposed between a sheet-shaped positive electrode and a negative electrode and wound in a spiral shape. A thin plate-shaped positive electrode current collector lead 6 made of aluminum or an aluminum alloy is drawn upward from the positiv...

Embodiment 2

[0043] In Example 2, each bottom wall thickness T1 of the grooves 20 , 21 , and 23 other than the end side groove 22 of the cleavage bend 16 is set to 0.031 mm. Since the other points are the same as those in Embodiment 1, description thereof will be omitted.

Embodiment 3

[0045] In Example 3, the front and rear thickness of the battery is increased to 4.0 mm, and correspondingly, the front and rear width of the cracking bend 16 is also increased to 2.5 mm. The respective bottom wall thickness dimensions T1 of the groove portions 20 , 21 , and 23 other than the end side groove portion 22 are set to 0.035 mm, respectively. Other points are the same as in Example 1.

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Abstract

It is an object of the present invention to provide a sealed prismatic battery in which the working pressure of the cleavage bend is stable even if the thickness of the bottom wall of each battery cell varies during battery production. It comprises a horizontally longer cover (3) for closing the opening of the battery casing (1) and a cracking bent piece (16) arranged on the cover (3) and cracked when the internal pressure of the battery rises abnormally. The cracking bent piece (16) has a concave annular groove (19) on the outer side of the cover (3), that is, near the left end portion of the cover (3). The annular groove (19) is formed by the groove portions (20, 21, 22, 23) on the front, rear, left and right sides to form a long annular shape in the horizontal direction, and the bottom wall thickness of the end side groove portion (22) is thicker than that of the other groove portions (20, 22). 21, 23) bottom wall thickness. The center-side groove portion (23) of the annular groove (19) is formed into an arcuate shape protruding toward the center side of the cover (3).

Description

technical field [0001] The present invention relates to a sealed prismatic battery equipped with a cracking bent that cracks when the internal pressure of the battery rises abnormally. Background technique [0002] If an excessive electrical load or excessive thermal load is applied to the above-mentioned sealed prismatic battery, a short circuit occurs inside the battery, gas is generated, and the internal pressure of the battery abnormally rises. When the battery is overcharged, gas will be generated inside the battery due to the decomposition of the electrolyte, and the internal pressure of the battery will rise abnormally. If the battery cannot withstand the abnormal rise in internal pressure and ruptures, its internal substances will be splashed out. Therefore, the battery is equipped with a cracking bend to prevent battery rupture, so that when the internal pressure exceeds a predetermined value, a crack occurs to release the internal pressure of the battery. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/103H01M50/176H01M50/553H01M50/627
CPCY02E60/10H01M50/3425H01M50/553H01M50/103H01M50/176H01M50/627H01M50/30H01M50/147H01M50/20
Inventor 松本佳巳渡边修杣友良树
Owner HITACHI MAXELL ENERGY LTD
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