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Nonaqueous secondary battery and nonaqueous secondary battery pack

A secondary battery, non-aqueous technology, used in secondary batteries, large-sized batteries/battery packs, small-sized batteries/battery packs, etc., can solve the problems of difficulty in reducing battery voltage and increasing short-circuit current. The effect of suppressing thermal runaway, suppressing smoking or cracking

Inactive Publication Date: 2012-02-08
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, it was found that if the non-aqueous secondary battery is pierced with a nail, for example, due to the heat release caused by the short circuit, the deterioration of the electrolyte can be generated between the nail and the positive electrode core, and the negative electrode-nail-positive electrode core body The short-circuit current flowing in the path becomes smaller, making it difficult to lower the battery voltage. As a result, the short-circuit current flowing in the path of the negative electrode-nail-positive electrode active material layer increases, and the thermodynamically unstable positive electrode active material layer generates heat. out of control

Method used

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  • Nonaqueous secondary battery and nonaqueous secondary battery pack
  • Nonaqueous secondary battery and nonaqueous secondary battery pack

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0043] [making of positive electrode]

[0044] The positive electrodes commonly used in the respective Examples and Comparative Examples were produced as follows. Lithium cobalt oxide (LiCoO 2 ), activated carbon HS-100 (manufactured by Denkai Kogyo Co., Ltd.) Wherein, N-methylpyrrolidone (NMP) was added in such a manner as to reach 50 mass % of the mass of the positive electrode mixture to prepare a positive electrode active material mixture slurry. Then, the positive electrode active material mixture slurry is coated on both sides of the positive electrode core made of aluminum foil with a thickness of 13 μm by the doctor blade method (coating amount: 400g / m 2 ), and then heated and dried (70-140° C.) to remove NMP, and then press-molded (packing density: 3.70 g / cc) to produce a positive electrode.

[0045] [Production of Negative Electrode]

[0046] The negative electrodes commonly used in the respective Examples and Comparative Examples were produced as follows. Artif...

experiment example 2

[0080] Next, for the battery modules of Examples 13 to 16 and Comparative Examples 23 to 26 obtained as follows, the nailing characteristics were measured in the same manner as in Experimental Example 1 above, and the results are shown in Table 3. Stack two batteries produced in parallel in series or in parallel, constitute the obtained material as a battery module, and then contact the flat part of the non-aqueous secondary battery using the laminated outer package in a state covered in parallel. , an aluminum plate with a thickness of 0.5 mm was arranged, and the aluminum plate was ultrasonically welded to the positive lead tab of one battery module.

[0081] For Experimental Example 2, an exploded perspective view of a non-aqueous secondary battery assembly 20A obtained by connecting two non-aqueous secondary batteries using a laminated outer package in series is shown in figure 2 In , an exploded perspective view of a nonaqueous secondary battery assembly 20B obtained by ...

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Abstract

The invention provides a nonaqueous secondary battery and a nonaqueous secondary battery pack that are extremely safe, being unlikely to emit smoke or explode even when a nail penetrates the battery in a charged state. In a flat nonaqueous secondary battery (10), an electrode assembly formed by stacking or winding a positive electrode and a negative electrode with a separator interposed therebetween is sealed in a laminated outer body (11) together with a nonaqueous electrolyte, and a positive electrode tab (12) and a negative electrode tab (13) are led out from the laminated outer body (11). The separator has a rupture elongation of 50% or more in at least the TD direction or the MD direction. A metal plate (14) connected to the positive electrode tab (12) is placed on an outer principal surface (15) of the laminated outer body (11).

Description

technical field [0001] The present invention relates to a non-aqueous secondary battery and a non-aqueous secondary battery package (pack) using a laminated outer package, and particularly to a non-aqueous secondary battery that is difficult to emit smoke or rupture even when it is charged and nailed, and is highly safe. A nonaqueous secondary battery and a nonaqueous secondary battery component. Background technique [0002] It is widely used as a drive power source for portable electronic devices such as mobile phones, portable personal computers, and portable music players, and as a power source for hybrid electric vehicles (HEV) or electric vehicles (EV) with high energy Non-aqueous secondary batteries represented by lithium-ion secondary batteries with high density and high capacity. [0003] These non-aqueous secondary batteries generally have a positive electrode and a negative electrode, wherein the positive electrode is coated with a positive electrode active mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/26H01M10/42H01M50/105H01M50/529
CPCH01M10/0585Y02E60/10H01M50/528Y02P70/50H01M50/105
Inventor 高桥健太郎
Owner SANYO ELECTRIC CO LTD
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