Secondary battery

A secondary battery and current collector technology, applied in the direction of secondary batteries, battery electrodes, battery components, etc., can solve the problem of being unable to cope with large-capacity batteries

Inactive Publication Date: 2010-06-16
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when this conventional technique is applied to a metal-vapor-deposited resin film, since metal vapor-deposition films are generally thinner and have higher resistance than metal foils, current collection at one location cannot cope. Big battery, that's a problem

Method used

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Examples

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Embodiment 1

[0071] Hereinafter, Embodiment 1 of the secondary battery of the present invention will be described with reference to FIG. 2 . In this example, first, manufacture a Figure 2A The electrode part of the structure shown. In this embodiment, an electrode having a resin film as a core material serving as a positive electrode and an electrode having a negative electrode active material applied on a metal foil serving as a negative electrode will be described.

[0072] As the resin film 7 , a biaxially stretched polypropylene film (Toray Industries, Ltd.: film YK57) having a thickness of 15 μm, a width of 80 mm, and a length of 350 mm was used. On the resin film 7, aluminum (1.5 [mu]m thick) for the metal layer 8 for the positive electrode current collector was formed by vacuum vapor deposition. On top of it, apply LiFePO with olivine structure 4 The positive electrode active material layer 9 (active material: acetylene black: PVDF = 90:5:5 (weight ratio)) as a positive electrod...

Embodiment 2

[0085] Compared with the secondary battery in Example 1, the secondary battery in Example 2 of the present invention is different in that LiMn of olivine structure is used 2 o 4 For the positive electrode active material. In other respects, the structure is similar to Embodiment 1.

Embodiment 3

[0091] Next, refer to image 3 with 4 Embodiment 3 of the secondary battery of the present invention is described. The content similar to that in Embodiment 1 will not be described. In Example 1, the current collectors having resin as the core material were stacked sequentially, while in this Example 3, the current collectors (positive electrodes in Example 3) having resin as the core material were folded into a screen shape.

[0092] First, a strip-shaped positive electrode 7 is prepared. Here, the shape required to form one secondary battery is 80 mm wide and 3300 mm long. Since it is so long, it remains coiled during operation.

[0093] As the negative electrode, one having the same specifications as in Example 1 was used.

[0094] Regarding the above-mentioned members, a secondary battery was obtained in the following procedure.

[0095] (a) The separator 6 is stacked on the negative electrode 5 .

[0096] (b) The positive electrode 4 is formed, and the resin film ...

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Abstract

A secondary battery having a positive electrode, negative electrode, and a separator, wherein at least one of the positive electrode and the negative electrode is formed of: a charge collector having resin as a core, and a metal layer; and an electrode active material on the metal layer, the metal layer of the charge collector is formed on one surface of the resin, and the charge collector is folded at least once.

Description

technical field [0001] The present invention relates to a secondary battery having a large capacity, and a secondary battery providing high safety at low cost. Background technique [0002] Secondary batteries including lithium ion secondary batteries have high capacity and high energy density, and are excellent in storage performance and charge / discharge repetition characteristics; thus, they are widely used in home appliances. On the other hand, secondary batteries use lithium metal and non-aqueous electrolytes, so sufficient safety measures are required. [0003] For example, when a short circuit occurs between the positive and negative electrodes of a secondary battery for some reason, in a case where the battery has a large capacity and high energy density, an excessive short circuit current flows, and Joule heat is generated due to internal resistance , so that the temperature of the battery rises. Thus, a function of preventing the battery from falling into an abnor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/00H01M4/64H01M10/0525H01M50/528
CPCH01M10/0525H01M4/661H01M4/667H01M4/668Y02E60/12Y02T10/7011Y02E60/10Y02P70/50
Inventor 冈野哲之西村直人
Owner SHARP KK
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