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Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in secondary batteries, battery pack components, battery boxes/coats, etc., can solve the problems of low resistance and increased heat generation, and achieve excellent impact resistance

Active Publication Date: 2020-05-15
PANASONIC ENERGY CO LTD MORIGUCHI SHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since there is no composite material layer in the exposed part and a low-resistance current collector is exposed, if an internal short circuit occurs in the exposed part, a large current will flow through the short-circuited part, resulting in increased heat generation.

Method used

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  • Non-aqueous electrolyte secondary battery
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  • Non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] [making of positive electrode]

[0060] With 100 parts by mass of LiNi as the positive electrode active material 0.815 co 0.15 Al 0.035 o 2 The characterized lithium nickelate, 1 mass part of acetylene black, and 0.9 mass part of polyvinylidene fluoride were mixed, and then an appropriate amount of N-methyl-2-pyrrolidone was added to prepare a positive electrode composite material slurry. Next, this positive electrode composite material slurry was coated on both surfaces of a long positive electrode current collector made of aluminum foil, and the coating film was dried. After the dried coating film was compressed with a roller, it was cut into a predetermined electrode size to produce a positive electrode having a positive electrode composite material layer formed on both surfaces of a positive electrode current collector. On both sides of the central part in the longitudinal direction of the positive electrode, an exposed portion where there is no composite materi...

Embodiment 2

[0069] A cylindrical battery was fabricated in the same manner as in Example 1 except that the exposed portion of the positive electrode was formed such that the position of the positive electrode tab was 4.7 mm away from the outer peripheral surface of the packaging can in the radial direction of the packaging can.

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Abstract

The purpose of the present disclosure is to provide a non-aqueous electrolyte secondary battery that has excellent impact resistance and does not easily ignite, smoke, etc. due to internal short circuits, even when the battery is subjected to strong impact. The non-aqueous electrolyte secondary battery according to one example of the embodiments comprises: a positive electrode (11) that has exposed parts (32A), (32B) that are formed at a longitudinal-direction middle part of a positive electrode collector (30); a positive electrode tab (20) that is bonded to exposed part (32A); insulating tape(40) that covers exposed part (32A) and is stuck to the positive electrode (11); and insulating tape (41) that covers exposed part (32B) and is stuck to the positive electrode (11). The insulating tape (40), (41) is stuck to the positive electrode (11) such that one width-direction end (40a) and one width-direction end (41a) and / or another width-direction end (40b) and another width-direction end(41b) do not overlap in the thickness direction of the positive electrode (11).

Description

technical field [0001] The present disclosure relates to a nonaqueous electrolyte secondary battery. Background technique [0002] Conventionally, in a non-aqueous electrolyte secondary battery including a wound electrode body, an exposed portion exposing the surface of the current collector is formed in the middle portion of the strip-shaped electrode constituting the electrode body in the longitudinal direction. , and a tab for current collection is connected to the exposed portion. In addition, since the low-resistance current collector is exposed without the composite material layer at the exposed portion, if an internal short circuit occurs at the exposed portion, a large current will flow through the short-circuited portion, resulting in increased heat generation. Therefore, an insulating tape covering the exposed portion is attached to the electrode (for example, refer to Patent Document 1). Since the exposed portions are formed to overlap on both surfaces of the el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/34H01M2/26H01M10/0587H01M50/119H01M50/538
CPCH01M10/0587Y02E60/10H01M10/0525H01M50/107H01M50/538Y02P70/50H01M50/119
Inventor 山下惠辅山上慎平
Owner PANASONIC ENERGY CO LTD MORIGUCHI SHI