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Secondary battery and battery system

A technology for secondary batteries and battery casings, applied in secondary batteries, secondary battery manufacturing, battery/battery traction, etc., can solve problems such as separator rupture, deformation, short circuit, etc., and achieve the effect of less failures

Inactive Publication Date: 2011-05-04
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in this structure, for example, in the case of using it as a power source for an electric vehicle, when continuous vibration is applied to the square battery case 1, although the electrode group is fixed by the belt, the belt will loosen in an environment immersed in an electrolytic solution. , so that the auxiliary plate 5 deforms along the shape of the square battery case 1 under the weight of the electrode group, and the positive electrode 2 and the negative electrode 3 are as Figure 9 The misalignment along the plane direction is shown, specifically, the positive electrode 2 and the negative electrode 3 are misaligned along the direction of their own planes, that is, the direction perpendicular to the stacking direction
When this misalignment occurs, as the corner 1a of the square battery case 1 is enlarged, Figure 10 As shown, the positive electrode 2 and the negative electrode 3 at the end of the electrode group are deformed along the square battery case 1, and when vibration is further applied in this deformed state, the separator will be broken, and as a result, failures such as short circuit will occur.

Method used

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no. 1 approach

[0068] Hereinafter, a secondary battery according to a first embodiment of the present invention will be described with reference to the drawings. This invention is not limited to the following best form, It can change suitably and implement in the range which does not change the summary of this invention.

[0069] figure 1 A cross-sectional structure of a laminated secondary battery is shown. An electrode group and two U-shaped insulating auxiliary plates are inserted into a rectangular battery case 1 formed of aluminum or the like. In the electrode group, a plurality of substantially rectangular plate-shaped The positive electrode 2 and the substantially rectangular plate-shaped negative electrode 3, the plate-shaped positive electrode 2 is electrically connected to the unillustrated positive terminal of the square battery case 1 through the positive electrode sheet, and the plate-shaped negative electrode 3 is connected to the unillustrated negative terminal through the n...

no. 2 approach

[0081] refer to image 3 , the laminated secondary battery of the second embodiment will be described. In this embodiment, the same reference numerals are attached to the same members as those used in the above-mentioned embodiment, and description thereof will be omitted. In addition, this embodiment can be appropriately changed and implemented in the range which does not change the summary of this invention.

[0082] exist image 3 In this method, unlike the above-mentioned first embodiment, the electrode group inserted into the prismatic battery case 1 is divided into two, and there are two pairs of U-shaped insulating auxiliary plates. Each electrode group 9 is arranged so as to sandwich each electrode group 9 in the side direction X.

[0083] In this case, the dimension d is preferably designed such that (f-g) / 2≦d≦f / 4. Except for the above point, it is the same as that described in the above-mentioned first embodiment.

[0084] The electrode group can also be further...

no. 3 approach

[0087] refer to Figure 4 , Figure 5 , the laminated secondary battery of the third embodiment will be described. In this embodiment, the same reference numerals are assigned to the same members as those used in the above-mentioned embodiment, and description thereof will be omitted. In addition, this embodiment can be suitably modified and implemented in the range which does not change the summary of this invention.

[0088] exist Figure 4 In this method, unlike the above-mentioned first embodiment, two U-shaped insulating auxiliary plates disposed so as to sandwich the electrode group 9 from the short-side direction Y of the cross-section of the square-shaped battery case are inserted. The dimension of the member 8 along the short-side direction Y is substantially the same as the inner dimension f along the short-side direction Y of the cross-section of the prismatic battery case. The size of the members 7 disposed along the longitudinal direction X and sandwiching the e...

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Abstract

The invention provides a secondary battery and a battery system. The secondary battery comprises a rectangular battery can (1) provided with a positive electrode terminal and a negative electrode terminal; an electrode group (9) arranged within the rectangular battery can and having a structure wherein a sheet-like positive electrode (2) electrically connected to the positive electrode terminal and a sheet-like negative electrode (3) electrically connected to the negative electrode terminal are laminated through a separator; a first and a second insulating auxiliary sheet having a generally U-shaped cross section in the same direction as the surface of the rectangular battery can on which the positive electrode terminal and the negative electrode terminal are formed; and an insulating tape (10). The first and second insulating auxiliary sheets are so arranged as to face each other with the electrode group being interposed between the sheets, and connected with each other by the insulating tape (10).

Description

technical field [0001] The present invention relates to a secondary battery in which a plurality of positive electrodes and negative electrodes are stacked through a separator, and a power supply / storage system using the battery. Background technique [0002] Among secondary batteries that can be recharged, lithium-ion secondary batteries in particular have high energy density and high capacity. Therefore, in addition to being used as power supplies for home appliances, in recent years, attention has been paid to power supplies for electric vehicles, Storage battery for storing excess power in residential power supplies, power plants, etc. [0003] As a form of a lithium ion secondary battery, there are a wound type lithium ion secondary battery in which a pair of belt-shaped positive electrodes and negative electrodes are formed in a spiral shape through a separator, and a plurality of separators are laminated. A laminated lithium-ion secondary battery with a plate-shaped ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/04H01M10/40
CPCH01M10/0436Y02E60/10Y02T10/70Y02P70/50H01M10/0413B60L50/64B60L53/50H01M10/0585H01M10/0525H01M2220/20
Inventor 桥本勉
Owner MITSUBISHI HEAVY IND LTD