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Method for manufacturing casing for lithium ion secondary battery

一种二次电池、制造方法的技术，应用在二次电池、电池盒/外套、制造工具等方向，能够解决电解液渗漏等问题，达到强度提高的效果

Inactive Publication Date: 2020-01-21
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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  • Method for manufacturing casing for lithium ion secondary battery
  • Method for manufacturing casing for lithium ion secondary battery
  • Method for manufacturing casing for lithium ion secondary battery

Examples

Experimental program
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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 the 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 stai...

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Abstract

The present invention provides a lithium ion secondary battery casing that can be joined without welding spatter and has high resistance to external forces acting on the battery casing, and a manufacturing method thereof. That is, the present invention is characterized in that the cup member (2) uses an austenite stainless steel foil, and the lid member (3) uses the austenite transformation start temperature A during the temperature rise process. c1 The point is maintained at 650-950°C, and the austenite + ferrite 2-phase temperature range is kept above 880°C. The two-phase stainless steel foil is in direct contact with the heating temperature in the temperature range of 880-1080°C. Diffusion bonding is performed while accompanied by grain boundary movement when the ferrite phase of the two-phase steel is transformed into the 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 same. Background technique [0002] Lithium-ion secondary batteries are used in power supplies for mobile communication devices, power supplies for portable information terminals, and the like because of their high energy. In addition, in recent years, it has also begun to be used as a driving power source for hybrid vehicles and electric vehicles, which have been popularized 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-tube 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 aluminum laminates with a thickness o...

Claims

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Application Information

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Patent Type & Authority Patents(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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