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Enclosed battery

A closed, battery technology, applied in secondary batteries, battery pack components, battery boxes/jackets, etc., can solve the problems of battery case temperature rise, slow response speed, complicated design, etc.

Inactive Publication Date: 2009-08-05
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The explosion-proof valve described in Patent Document 2 is useful in terms of a high degree of freedom in design because it can be installed without being limited by space, but the groove-shaped thin-walled part is broken by deformation of the outer tank. Mechanism, depending on the location where the explosion-proof valve is installed, it is necessary to change the thickness of the groove-shaped thin-walled part or the length of the groove, and there is a problem that the design becomes complicated
[0007] In addition, when the pressure in the battery rises

Method used

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Experimental program
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Embodiment

[0046] Hereinafter, the present invention will be described in detail using examples.

[0047] (Battery A)

[0048] In NiSO 4 To the aqueous solution, add Co and Al sulfate in a molar ratio of Ni:Co:Al=7:2:1 to make a saturated aqueous solution. While stirring the saturated aqueous solution, slowly add sodium hydroxide solution dropwise to neutralize it. As a result, Ni 0.7 Co 0.2 Al 0.1 (OH) 2 Represents the sediment of the ternary system. The precipitate was filtered, washed with water, and dried at 80°C to obtain a composite hydroxide. The average particle size of the obtained composite hydroxide was 10 μm.

[0049] The composite hydroxide was subjected to heat treatment at 900°C for 10 hours in the atmosphere to obtain Ni 0.7 Co 0.2 Al 0.1 O represents a ternary composite oxide. Then, lithium hydroxide monohydrate was added so that the total number of Ni, Co, and Al atoms was equal to the number of Li atoms, and heat treatment was performed at 800°C in air for 10 hours to obta...

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Abstract

A tubular electrode group obtained by winding a positive electrode plate and a negative electrode plate through a separator is inserted into a rectangular battery case along with electrolyte. A pressure release mechanism is provided on the lower surface of the battery case which is parallel with the winding axis of the electrode group. The pressure release mechanism is disposed at a position spaced apart from a projection line formed when the winding axis of the electrode group is projected at a right angle to the lower surface of the battery case.

Description

Technical field [0001] The present invention relates to a sealed battery that can ensure high safety even when the internal pressure of the battery rises. Background technique [0002] Sealed batteries, especially sealed secondary batteries that can be charged and discharged, are used as power sources for mobile phones, computers, and other devices. In the field of pursuing high-energy-density batteries corresponding to miniaturization and weight reduction, they are also used as power tools or hybrids. The market scope of power supplies such as power vehicles is expanding in the field of pursuing high-output batteries. Especially in the high output area, since the design is designed to minimize the internal resistance of the sealed battery, the positive and negative electrodes are short-circuited by internal factors such as impurities mixed in the battery or external factors such as external pressure. , A large current flows intensively through the short-circuited part, the heat ...

Claims

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Application Information

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IPC IPC(8): H01M2/12H01M2/02H01M50/103
CPCH01M10/0587H01M10/0525H01M2/1241H01M2/0217H01M2/0202Y02E60/12Y02T10/7011Y02E60/10H01M50/103H01M50/3425
Inventor 藤田秀明
Owner PANASONIC CORP