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Nonaqueous electrolyte battery and battery pack

A non-aqueous electrolyte and battery pack technology, applied in non-aqueous electrolyte battery electrodes, battery electrodes, secondary batteries, etc., can solve the problems of insufficient absorption of electrode expansion and contraction, shortened charge-discharge cycle life, etc.

Active Publication Date: 2018-03-23
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the thickness of the separator is reduced, an internal short circuit occurs in the middle of the charge-discharge cycle, or the expansion and contraction of the electrode due to charge-discharge cannot be fully absorbed, and a force is locally applied to the electrode, resulting in a large gap in the current distribution. difference, so there is a problem that the charge-discharge cycle life is shortened

Method used

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  • Nonaqueous electrolyte battery and battery pack
  • Nonaqueous electrolyte battery and battery pack
  • Nonaqueous electrolyte battery and battery pack

Examples

Experimental program
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Effect test

no. 1 Embodiment approach

[0018] According to the first embodiment, there is provided a nonaqueous electrolyte battery including an electrode group and a nonaqueous electrolyte. The electrode group is formed by winding a positive electrode, a negative electrode, and a separator arranged between the positive electrode and the negative electrode in a flat or cylindrical shape. For the diaphragm, the tensile modulus of elasticity in the winding direction is 200 (N / mm 2 ) above and 2000(N / mm 2 ) or less, and the separator is porous. However, as the winding direction (hereinafter referred to as MD (machine direction) direction), the longitudinal direction of the separator or the direction perpendicular to the winding axis of the electrode group can be used. The separator is excellent in flexibility even when it is thin, and can deform like a spring by following the deformation of the electrode group or the positive and negative electrodes due to expansion and contraction during charge and discharge cycles...

no. 2 Embodiment approach

[0109] According to the second embodiment, there is provided a battery pack including a nonaqueous electrolyte battery. As the nonaqueous electrolyte battery, the nonaqueous electrolyte battery described in the first embodiment was used. The number of nonaqueous electrolyte batteries (single cells) included in the battery pack can be set to one or more.

[0110] A plurality of non-aqueous electrolyte batteries can be electrically connected in series, in parallel, or a combination of series and parallel to form a battery pack. A battery pack can also contain multiple battery packs.

[0111] The battery pack may further include a protection circuit. The protection circuit has a function of controlling charge and discharge of the nonaqueous electrolyte battery. In addition, a circuit included in a device using a battery pack as a power source (for example, electronic equipment, an automobile, etc.) can be used as a protection circuit for the battery pack.

[0112] In addition...

Embodiment 1

[0122]

[0123] As the positive electrode active material, prepare LiNi 0.5 co 0.2 mn 0.3 o 2 . In addition, graphite and acetylene black were prepared as conductive agents. Furthermore, polyvinylidene fluoride (PVdF) was prepared as a binder. Next, the positive electrode active material, graphite, acetylene black, and PVdF were mixed to obtain a mixture. At this time, graphite was added in a proportion of 2.5% by weight relative to the entire positive electrode produced. Acetylene black was added in a proportion of 2.5% by weight based on the entire positive electrode produced. PVdF was added so as to be 5% by weight based on the entire positive electrode produced. Next, the obtained mixture was dispersed in an N-methylpyrrolidone (NMP) solvent to prepare a slurry. The coating amount of the obtained slurry was 80g / m2 per unit area 2 coated on aluminum foil with a thickness of 15 μm and allowed to dry. Next, the dried coating film is pressurized. In this way, the ...

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Abstract

One embodiment of the present invention provides a nonaqueous electrolyte battery which comprises an electrode group and a nonaqueous electrolyte. The electrode group is obtained by winding a positiveelectrode, a negative electrode and a separator that is arranged between the positive electrode and the negative electrode. The separator has a tensile modulus of elasticity of from 200 N / mm2 to 2,000 N / mm2 (inclusive) in the winding direction.

Description

technical field [0001] Embodiments of the present invention relate to a nonaqueous electrolyte battery and a battery pack. Background technique [0002] Nonwoven fabrics made of polyolefins, cellulose fibers, and the like have been used as separators for nonaqueous electrolyte batteries such as lithium batteries and lithium ion batteries. In order to meet the demand for higher capacity of non-aqueous electrolyte batteries, studies have been made to reduce the thickness of the separator. However, if the thickness of the separator is reduced, an internal short circuit occurs in the middle of the charge-discharge cycle, or the expansion and contraction of the electrode due to charge-discharge cannot be fully absorbed, and a force is locally applied to the electrode, resulting in a large gap in the current distribution. difference, so there is a problem that the charge-discharge cycle life is shortened. [0003] prior art literature [0004] patent documents [0005] Patent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M2/16H01M2/18H01M4/13H01M4/485H01M10/0587H01M50/414H01M50/429H01M50/469H01M50/494
CPCH01M4/485H01M10/0525H01M10/0587H01M4/131Y02E60/10H01M50/44Y02P70/50H01M50/429H01M50/469H01M50/414H01M50/494H01M2004/028
Inventor 志子田将贵猿渡秀乡山本大山岸元气渡边浩志
Owner KK TOSHIBA