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Lithium ion battery pack

A technology for lithium-ion battery packs and single cells, which is applied in lithium storage batteries, battery pack components, secondary batteries, etc., can solve the problems of low electron mobility, low conductivity, and increased resistance.

Pending Publication Date: 2022-07-08
APB CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a resin current collector is used for a single cell, the resin current collector has lower electron mobility than a metal current collector, so it has a low electrical conductivity and the resistance between stacked single cells becomes high. Propensity

Method used

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  • Lithium ion battery pack
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Examples

Experimental program
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Effect test

manufacture example 1

[0097]

[0098] Using a twin-screw extruder, under the conditions of 180° C., 100 rpm, and residence time of 5 minutes, 70 parts of polypropylene [trade name “SUN ALLOMER PC684S”, manufactured by SunAllomer Ltd.], carbon black [trade name “ENSACO 250G pellets] (specific surface area 68m 2 / g)", manufactured by Imerys Corporation] 25 parts, dispersant [trade name "YOUMEX 1001", manufactured by SANYOCHEMICAL INDUSTRIES, LTD.] 5 parts were melt-kneaded to obtain a resin current collector material for positive electrodes. The obtained resin current collector material for positive electrodes was rolled to obtain a positive electrode current collector (P1) with a film thickness of 100 μm.

manufacture example 2

[0099]

[0100] Except that the carbon black of Production Example 1 was changed to the trade name "#3030 (specific surface area 32 m 2 / g)" (manufactured by Mitsubishi Chemical Corporation), the same operations as in Production Example 1 were performed to obtain a positive electrode current collector (P2) with a film thickness of 100 μm.

manufacture example 3

[0101]

[0102] Except that the carbon black of Production Example 1 was changed to the trade name "DENKA BLACK (specific surface area 69 m 2 / g)" (manufactured by Denka Company Limited.) was performed in the same manner as in Production Example 1 to obtain a positive electrode current collector (P3) with a film thickness of 100 μm.

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Abstract

Provided is a lithium ion battery pack in which two or more unit cells are stacked, said lithium ion battery pack having a low DC resistance value between the unit cells. This lithium ion battery pack has two or more single cells each comprising a laminated unit in which a positive electrode current collector, a positive electrode active material layer, a separator, a negative electrode active material layer, and a negative electrode current collector are laminated in this order, and is characterized in that: one single cell and another single cell are laminated; the positive electrode current collector is configured from a conductive resin layer containing a polyolefin resin (A1) and a conductive carbon filler (B1), the negative electrode current collector is configured from two or more types of conductive layers, and among the conductive layers of the negative electrode current collector, at least one of the conductive carbon filler (B1) and the polyolefin resin (A1) are in contact with each other. The conductive layer disposed on the outer side contains a polyolefin resin (A1) and a conductive carbon filler (B1).

Description

technical field [0001] The present invention relates to a lithium ion battery pack. Background technique [0002] Lithium-ion batteries have characteristics such as high voltage and high energy density, and thus have been widely used in various applications in recent years. The application to a hybrid vehicle, an electric vehicle, etc. has also been studied, and further higher capacity and higher output of the secondary battery is required for practical application. [0003] In general, a lithium ion battery has two or more single cells including a stacked unit in which a positive electrode current collector, a positive electrode active material layer, a separator, a negative electrode active material layer, and a negative electrode current collector are stacked in this order. [0004] In such a lithium ion battery in which two or more single cells are stacked, in order to improve the output power per unit weight of the battery, a battery using a resin current collector as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/64
CPCH01M4/668H01M4/663Y02E60/10Y02P70/50H01M50/204H01M4/661H01M4/667H01M10/0525H01M10/0585H01M2004/021
Inventor 堀江英明工藤峻草野亮介都藤靖泰
Owner APB CORP