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Secondary battery

A technology of secondary batteries and wound electrodes, which is applied in secondary battery manufacturing, battery pack components, circuits, etc., can solve the problems of battery foreign matter and battery reliability reduction, and achieve the effect of high reliability

Inactive Publication Date: 2013-05-01
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] When floating or peeling occurs at the end side of the exposed part of the negative electrode active material mixture layer of the negative electrode active material, since the negative electrode active material is conductive, there will be conductive foreign matter inside the battery, thereby reducing the reliability of the battery. reduce

Method used

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Examples

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Deformed example 1 and 2

[0111] In the above-described embodiment, an example was shown in which the negative electrode current collector 19 was brought into contact with both surfaces of the outermost surface of the negative electrode core exposed portion 16 divided into two. However, it is not a necessary condition that the negative electrode current collector 19 connected to the negative electrode terminal 20 is in contact with the two sides of the outermost surface of the negative electrode core body exposed part 16 divided into two parts, and it may be at least after being divided into two parts. The negative electrode current collector 19 is connected to one of the outermost surfaces of the negative electrode core exposed portion 16 .

[0112] use Figure 5A and Figure 5B For such modified examples 1 and 2 after resistance welding, the negative electrode current collector 19 connected to the negative electrode terminal 20 is brought into contact with at least one of the outermost surfaces of t...

Deformed example 3 and 4

[0117] In the flat wound electrode body 14 of the embodiment, as Figure 3A ~ Figure 3C As shown, there is shown an example of using a flat wound electrode body in which a floating prevention tape 35 is wound flat on the boundary between the separator 13 positioned on the outermost peripheral side and the negative electrode core exposed portion 16 . One round of the wound electrode body 14 is fixed. However, in the flat wound electrode body, the part where the negative electrode active material mixture layer tends to float on the outermost negative electrode plate is near the corner, so as Modification 3, Figure 6A and Figure 6B As shown, even if the anti-floating belts 35 are provided at the corners of the four locations, a good effect is achieved. It should be noted, Figure 6A is a perspective view of a flat wound electrode body according to Modification 3, Figure 6B Yes Figure 6A A perspective view of the back side of the flat wound electrode body.

[0118] In ad...

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Abstract

Provided is a secondary battery including a flat wound electrode assembly, where the negative electrode active material mixture layer hardly causes semi-floating and peeling at the end side of the negative electrode substrate exposed portion even if the negative electrode substrate exposed portion located in a region of the outermost surface of the negative electrode plate is considerably bent. The flat wound electrode assembly includes a wound positive electrode substrate exposed portion formed on one end portion thereof and a wound negative electrode substrate exposed portion formed on another end portion thereof. An end portion of a negative electrode active material mixture layer on the negative electrode substrate exposed portion side protrudes more than an end portion of a positive electrode active material mixture layer of the adjacent positive electrode plate. The negative electrode substrate exposed portion is converged on a central site in the thickness direction of the flat wound electrode assembly. A separator is located at the outermost surface of the flat wound electrode assembly. The separator located at the outermost surface and the negative electrode substrate exposed portion of the adjacent negative electrode plate are fixed integrally with a fixing member.

Description

technical field [0001] The present invention relates to a highly reliable secondary battery including a flat wound electrode body. Background technique [0002] As the driving power of portable electronic devices such as mobile phones, portable personal computers, and portable music players, or power sources for hybrid electric vehicles (HEV, PHEV), and electric vehicles (EV), lithium-ion secondary batteries Secondary batteries such as nickel-metal hydride secondary batteries are widely used. When space efficiency is particularly required for the above-mentioned secondary battery, the demand for a prismatic battery is higher than that for a cylindrical battery. [0003] A prismatic secondary battery, for example, a prismatic non-aqueous electrolyte secondary battery is fabricated as follows. That is, a negative electrode plate in which a negative electrode active material mixture layer containing a negative electrode active material is formed on both surfaces of a negative...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/04H01M4/02H01M50/538
CPCY02E60/12H01M4/02H01M10/04H01M10/0431Y02E60/10Y02P70/50
Inventor 野中太贵藤原丰树
Owner SANYO ELECTRIC CO LTD