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Lithium-ion secondary-battery case and manufacturing method therefor

A secondary battery and manufacturing method technology, applied in the direction of secondary batteries, battery boxes/coats, manufacturing tools, etc., can solve problems such as electrolyte leakage, and achieve the effect of improving strength

Inactive Publication Date: 2017-08-18
NISSHIN STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In this way, the casing for lithium ion secondary batteries disclosed in Patent Document 1 uses austenitic stainless steel foil as a raw material and is joined by seam welding, although it can solve the problems of weight reduction, strength of external force, and further electrolyte leakage. However, there is a problem that the joint cannot be completed without welding spatter during seam welding

Method used

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  • Lithium-ion secondary-battery case and manufacturing method therefor
  • Lithium-ion secondary-battery case and manufacturing method therefor
  • Lithium-ion secondary-battery case and manufacturing method therefor

Examples

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Embodiment approach

[0036] figure 1 is a schematic diagram of a case 1 for a lithium ion secondary battery according to an embodiment of the present invention, figure 2 It is the cup member 2 which comprises the case 1 for lithium ion secondary batteries mentioned above. The cup member 2 is a cup-shaped member that is punched out of austenitic stainless steel foil as a raw material, and is further penetrated with holes 6 for leading out electrode terminals 4 and 5 . By diffusion bonding this to the lid member 3 , the case 1 for a lithium ion secondary battery is formed. It should be noted that the details will be described later, but in the illustrated embodiment, the hollow hole 6 is provided in the vertical wall portion 7 of the cup member 2 .

[0037] The cup member 2 and the lid member 3 use stainless steel foil as a raw material. The stainless steel foil used for the cup member 2 is an austenitic stainless steel foil because it involves pressing.

[0038] On the other hand, the stainles...

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Abstract

This invention provides a lithium-ion secondary-battery case, and a manufacturing method therefor, that can be joined with no weld spatter and is strong with respect to external forces acting on said case. Said case is characterized in that: a cup component (2) comprises an austenite stainless-steel foil; a cap component (3) comprises a two-phase stainless steel that exhibits an austenite start temperature Ac1 between 650 DEG C and 950 DEG C during a temperature-raising process and has an austenite-ferrite two-phase temperature region starting at 880 DEG C; said components are placed in direct contact with each other; and in a heating-temperature range of 880-1080 DEG C, diffusion bonding is performed, accompanied by grain-boundary migration as the ferrite phase of the two-phase steel transforms into an austenite phase.

Description

technical field [0001] The present invention relates to a case for a lithium ion secondary battery using stainless steel foil as a raw material of the case and a method for manufacturing the case. Background technique [0002] Lithium-ion secondary batteries are used as power supplies for mobile communication devices, portable information terminals, and the like because of their high energy. In addition, in recent years, they have also begun to be used as drive power sources for hybrid vehicles and electric vehicles, which have been widely spread as countermeasures against global warming. [0003] Conventionally, such lithium-ion secondary battery casings have been made of aluminum sheet or stainless steel sheet and deep-drawn into a cylindrical or square cylindrical shape. Generally, the thickness of the raw material plate in this case is 0.5-0.8mm. However, in order to reduce weight, lithium-ion secondary batteries that use an aluminum laminate with a thickness of 0.1 mm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02C22C38/00H01M2/04H01M50/119H01M50/133H01M50/159
CPCC22C38/00C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50C21D2211/001B23K11/0026B23K11/061B23K11/20B23K20/023B23K20/227B23K20/24B23K2103/05B23K2103/18H01M10/0525Y02E60/10H01M50/103H01M50/169H01M50/15H01M50/159H01M50/133H01M50/119C21D2211/005Y02P70/50C22C38/001Y02T10/70H01M50/138H01M50/1535
Inventor 乘田克哉三浦教昌黑部淳
Owner NISSHIN STEEL CO LTD
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