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Battery can and method of manufacturing the same

A manufacturing method and technology of battery cans, which are applied to lithium batteries, battery pack parts, battery boxes/coatings, etc., can solve problems such as being vulnerable to damage, and achieve the effect of ensuring strength

Inactive Publication Date: 2008-06-25
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Since the conventional battery can has the above-mentioned shape, there is a problem that when the electrode plate group is housed in the battery can, the electrode plate group contacts the opening of the battery can and is easily damaged.

Method used

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  • Battery can and method of manufacturing the same
  • Battery can and method of manufacturing the same
  • Battery can and method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The battery can of the present invention was produced according to the method of producing the battery can of the present invention described in the above embodiments. Specifically, the battery can of the present invention was produced in the following manner.

[0053] The nickel-plated steel sheet was punched out into a circular shape, and the nickel-plated steel sheet was drawn so that the inner side was formed, thereby obtaining a can base material composed of a bottomed cylindrical body. Using a forming die and a forming punch having the structure shown in Figure 2, the obtained tank base material made of a cylindrical body with a bottom is subjected to a DI process (step (1)), and formed into a cylindrical shape, thereby obtaining the tank base material having the shape shown in Figure 4 Intermediate product 8 of the structure shown.

[0054] Next, in the intermediate product 8 obtained above, insert the flaring punch 12 having the structure shown in FIG. 1 =D 2...

Embodiment 2

[0069] As shown in Table 2, by changing the length L of the boundary portion from the first side side to the second side side 1 while making {L 1 / (T 2 -T 1 )} were changed in various ways, and battery cans A to D were produced in the same manner as in Example 1.

[0070] Table 2

[0071] L1(mm)

{L 1 / (T 2 -T 1 )}

Battery tank A

2

25

battery tank B

4

50

battery tank C

8

100

battery tank D

10

125

[0072] The lithium ion secondary battery shown in FIG. 6 was manufactured by using battery cans A to D to seal according to the following steps. As the electrode plate group housed in the battery can 21 , an electrode group having a diameter of 17.75 mm was used. The positive electrode plate 25 is electrically connected to the sealing body 22 through the positive electrode lead 25a, and the negative electrode plate 26 is electrically connected to the bottom inn...

Embodiment 3

[0076] As shown in Table 3, the length L in the longitudinal direction of the can base material of the convex part of the flaring punch used when the intermediate product is processed into a battery can by step (2) was changed. 2 , so that (L 3 / L 2 ) was changed in various ways, battery cans E to I were produced in the same manner as in Example 1. Then, the inner diameter D of the second side portion of each battery can was measured 2 and the inner diameter D of the bottom of the battery can 3 . The measurement results are shown in Table 3.

[0077] table 3

[0078] L 2 (mm)

L 3 / L 2

D. 2 (mm)

D. 3 (mm)

Battery tank E

0.12

0.02

17.70

18.00

Battery tank F

0.3

0.05

17.76

18.00

Battery tank G

1.2

0.2

17.76

18.00

Battery tank H

2.4

0.4

17.76

18.00

Battery tank I

3

0....

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Abstract

To provide a battery can into which an electrode assembly can be housed smoothly without causing damage to the electrode assembly while ensuring the strength of the opening portion. In the battery can including a cylindrical side portion, a bottom, and an opening portion, the cylindrical side portion includes a first side portion formed at the bottom side, and a second side portion formed at the opening portion side. The thickness T 1 of the first side portion and the thickness T 2 of the second side portion are adjusted to satisfy a relational expression: T 1 < T 2 , and the inner diameter of the cylindrical side portion is constant from the opening portion side to the bottom side.

Description

technical field [0001] The present invention relates to a battery can used as an exterior case for an alkaline dry battery, a nickel-metal hydride storage battery, and a nonaqueous electrolyte secondary battery represented by a lithium ion battery, and a method for manufacturing the same. Background technique [0002] In recent years, with the development of portable devices, the number of batteries used as a power source for the devices has been increasing. Therefore, from a market point of view, there is a strong demand for lower product prices for both secondary batteries and primary batteries. [0003] A DI process (Drawing and Ironing) has been proposed as a manufacturing method for improving the production efficiency of a battery can used as an exterior case of a battery and reducing the production cost of the battery can. In the DI process, multiple dies with different drawing and reducing extrusion diameters are configured in such a way that the drawing and reducing...

Claims

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Application Information

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IPC IPC(8): H01M2/02H01M50/107
CPCH01M2/022H01M2/0202H01M10/052Y02E60/10H01M50/107
Inventor 阪下文晴羽野正敏森克彦德本忠宽足立光司
Owner PANASONIC CORP
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