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Secondary battery, battery pack, electric vehicle, power storage system, electric tool, and electronic device

A secondary battery and component technology, which is applied to large-size batteries/battery packs, small-size batteries/battery packs, secondary batteries, etc., and can solve problems affecting the structural stability of wound electrode bodies and battery characteristics , to achieve the effect of excellent battery characteristics

Active Publication Date: 2019-12-06
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The composition of a secondary battery with a wound electrode body will affect the structural stability of the wound electrode body, which will further greatly affect the battery characteristics

Method used

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  • Secondary battery, battery pack, electric vehicle, power storage system, electric tool, and electronic device
  • Secondary battery, battery pack, electric vehicle, power storage system, electric tool, and electronic device
  • Secondary battery, battery pack, electric vehicle, power storage system, electric tool, and electronic device

Examples

Experimental program
Comparison scheme
Effect test

Deformed example 1

[0332] For example, as corresponding to Figure 5 of Figure 6 As shown, the step relaxation belt 41 ( 41A to 41L) may be additionally provided on one or both of the first positive electrode winding portion 10X and the first negative electrode winding portion 20X. That is, it is also possible to Figure 5 In the position where the step relaxation zone 40 is not installed, the step relaxation zone 41 is newly installed. The configuration of the step relaxation zone 41 is, for example, the same as that of the step relaxation zone 40 . However, it is not necessary to provide all the step relaxation belts 41A to 41L, and it is only necessary to provide one or more of the above step relaxation belts 41A to 41L. In this case also, the same effect can be obtained.

[0333] Specifically, for example, in the first negative electrode wound portion 20X, as Figure 5 As shown, the outer peripheral side negative electrode active material layer 22B is provided on the outer peripheral s...

Deformed example 2

[0347] For example, as corresponding to Figure 5 of Figure 7 As shown, the step relaxation belts 41 ( 41M, 41N, 41P to 41S) can also be provided by changing the extension range of the first positive electrode winding portion 10X and changing the extension range of the fourth negative electrode winding portion 20W. However, it is not necessary to provide all the step relaxation zones 41M, 41N, 41P to 41S, and it is only necessary to provide one or more of the above-mentioned step relaxation zones 41M, 41N, 41P to 41S. In this case, the same effect can be obtained.

[0348] Specifically, for example, by extending the first positive electrode winding portion 10X to the second region R2, it can be provided on the surface of the inner peripheral side of the positive electrode current collector 11 (first positive electrode exposed portion 11XP) in the second region R2. The stepped relaxing belt 41M may be provided with a stepped relaxing belt 41N on the surface on the outer peri...

Deformed example 3

[0352] It is also possible to increase the number of installations of the above-mentioned step relaxation belts 40 at each installation position of the above-mentioned step relaxation belts 40 .

[0353] For example, if Figure 5 As shown, in the first positive electrode wound portion 10X, one step relaxation belt 40A is provided on the surface on the inner peripheral side of the first positive electrode exposed portion 11XP in the first region R1. However, for example, two or more level relief belts 40A may be provided on the surface on the inner peripheral side of the first positive electrode exposed portion 11XP. In this case, for example, two or more step relaxation belts 40A may be arranged side by side. In this case also, the same effect can be obtained.

[0354] Of course, at other installation positions in the first positive electrode winding portion 10X, two or more step relaxation belts 40 may be similarly installed. In addition, each installation position of the ...

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Abstract

A secondary battery excellent in battery characteristics, a battery pack, an electric vehicle, a power storage system, an electric tool, and an electronic device are provided. The secondary battery includes a coiled electrode body having a flat shape defined by a long axis and a short axis. A positive / negative electrode comprises, at a coil inner end portion in the coiling direction, a first positive / negative electrode coiling portion extending in the long-axis direction and equipped with a positive / negative terminal. The first negative electrode coiling portion is opposed to the first positive electrode coiling portion through a diaphragm. The negative terminal does not overlap the positive terminal in the short-axis direction. The secondary battery also includes one or more than two steprelief members disposed on at least more than one of the first positive electrode coiling portion and the first negative electrode coiling portion in at least one of first to third regions. The firstregion is closer to the coil outer side of the positive electrode in the coiling direction than the positive terminal in the long-axis direction. The second region is closer to the coil outer side ofthe negative electrode in the coiling direction than the negative terminal in the long-axis direction. The third region is located between the positive terminal and the negative terminal.

Description

technical field [0001] The present technology relates to a secondary battery including a wound electrode body including a positive electrode and a negative electrode, and battery packs, electric vehicles, power storage systems, electric tools, and electronic equipment using the secondary battery. Background technique [0002] With the widespread use of various electronic devices such as mobile phones, miniaturization, weight reduction and long life of these electronic devices are required. Therefore, as a power source, the development of a secondary battery that is small, lightweight and capable of obtaining high energy density has been progressing. [0003] The application of this secondary battery is not limited to the above-mentioned electronic equipment, and application to other applications is under study. As an example, there are battery packs mounted detachably on electronic devices, electric vehicles such as electric cars, power storage systems such as home power se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M10/04H01M2/02H01M10/42H01M10/48H01M50/10H01M50/557
CPCH01M10/0587H01M10/0431H01M10/425H01M10/486H01M2220/10H01M2220/20H01M2220/30H01M50/557H01M50/10Y02E60/10Y02P70/50
Inventor 松井贵昭国分崇本多一辉木暮太一山川直子
Owner MURATA MFG CO LTD