Electricity storage unit

Abstract

The present invention relates to an electricity storage cell comprising: an electrode body; a unit case that accommodates the electrode body; a collector terminal connected to the electrode body; the external terminal is connected with the current collection terminal and is arranged outside the unit shell; and an insulating member provided between the cell case and the external terminal, the current collector terminal having a plurality of current collector elements connected to the electrode bodies, respectively, and the external terminal having a plurality of terminal elements connected to the current collector elements, respectively. As a result, deterioration of the insulating member can be suppressed.

Description

Technical Field

[0001] The present invention relates to an electric storage unit. Background Art

[0002] Japanese Patent Publication No. 2011-175913 discloses a stacked battery comprising: a stack; a pair of positive collector terminals and a pair of negative collector terminals connected to the stack; a positive tab connected to the pair of positive collector terminals; a negative tab connected to the pair of negative collector terminals; and an outer casing.

[0003] In the power storage unit described in Japanese Patent Application Laid-Open No. 2011-175913, an insulating member is sometimes disposed between the unit case such as an outer casing and the external terminal for the purpose of sealing, etc. In this case, if the output increases, the insulating member may be degraded by Joule heat associated with the large current. Summary of the invention

[0004] In view of the above technical problems, an object of the present invention is to provide a power storage unit capable of suppressing degradation of an insulating member.

[0005] According to one aspect of the present invention, a storage unit comprises: an electrode body; a unit case that accommodates the electrode body; a collector terminal connected to the electrode body; an external terminal connected to the collector terminal and arranged outside the unit case; and an insulating component arranged between the unit case and the external terminal, the collector terminal having a plurality of collector elements respectively connected to the electrode body, and the external terminal having a plurality of terminal elements respectively connected to each of the collector elements.

[0006] According to the present invention, it is possible to provide a power storage unit capable of suppressing degradation of an insulating member. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a perspective view schematically showing an electric storage unit in one embodiment of the present invention.

[0008] Figure 2 for Figure 1 II-II cross-sectional view.

[0009] Figure 3 for Figure 1 III-III cross-sectional view. DETAILED DESCRIPTION

[0010] Embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings referred to below, the same or corresponding components are denoted by the same reference numerals.

[0011] Figure 1It is a perspective view schematically showing an electric storage unit in one embodiment of the present invention. Figure 2 for Figure 1 II-II cross-sectional view. Figure 3 for Figure 1 III-III cross-sectional view.

[0012] like Figures 1 to 3 As shown, the power storage cell 1 includes an electrode body 100, a cell case 200, and a current collecting terminal 300 (see Figure 2 ), external terminal 400 and insulating component 500.

[0013] The electrode body 100 includes a positive electrode sheet, a separator and a negative electrode sheet. The positive electrode sheet, the negative electrode sheet and the separator are formed into a long rectangular shape. The electrode body 100 can be formed by winding the positive electrode sheet, the separator and the negative electrode sheet. The electrode body 100 includes a plurality of positive electrode tabs 110 and a plurality of negative electrode tabs (not shown).

[0014] The positive electrode sheet includes a positive electrode foil and a positive electrode mixed material layer disposed on the positive electrode foil. An uncoated portion where the positive electrode mixed material layer is not formed is formed on the positive electrode foil, and a plurality of positive electrode tabs 110 are formed on the uncoated portion. Each positive electrode tab 110 is, for example, Figure 2 The device protrudes on one side (in the left-right direction).

[0015] The negative electrode sheet includes a negative electrode foil and a negative electrode mixed material layer formed on the negative electrode foil. An uncoated portion where the negative electrode mixed material layer is not formed is formed on the negative electrode foil, and a plurality of negative electrode tabs are formed on the uncoated portion. Each negative electrode tab protrudes, for example, to the other side in the width direction.

[0016] The cell case 200 accommodates the electrode body 100 . The cell case 200 is sealed. The cell case 200 includes a case body 210 and a cover 220 .

[0017] The housing body 210 has a Figure 1 In the up-down direction) on one side ( Figure 1 The housing body 210 is made of a metal such as aluminum. The housing body 210 has a bottom wall (not shown) and a peripheral wall 214. The bottom wall is formed in a rectangular and flat plate shape. The peripheral wall 214 stands up from the bottom wall. The peripheral wall 214 is formed in a square tube shape.

[0018] The cover 220 closes the opening of the housing body 210. The cover 220 is connected to the opening by welding or the like. The cover 220 is formed in a flat plate shape. The cover 220 is made of metal such as aluminum.

[0019] like Figure 2As shown, the current collector terminal 300 is connected to the electrode body 100. Specifically, the current collector terminal 300 includes a positive current collector terminal 310 connected to each positive electrode tab 110 and a negative current collector terminal (not shown) connected to each negative electrode tab.

[0020] The positive electrode current collecting terminal 310 includes a plurality of positive electrode current collecting elements 311 and 312 connected to the positive electrode tabs 110, respectively (see Figure 3 In this embodiment, the plurality of positive electrode current collectors include a pair of positive electrode current collectors 311 and 312. The plurality of positive electrode current collectors 311 and 312 may be formed in mutually independent shapes or may be formed in a shape that branches in the middle of a single current collector connected to each positive electrode tab 110.

[0021] The negative electrode current collecting terminal is formed in substantially the same shape as the positive electrode current collecting terminal 310. That is, the negative electrode current collecting terminal has a plurality of negative electrode current collecting elements.

[0022] The external terminal 400 is connected to the collector terminal 300 and is provided outside the cell case 200. Specifically, the external terminal 400 is fixed to the upper surface of the cover 220 of the cell case 200. The external terminal 400 includes a positive external terminal 410 and a negative external terminal 420.

[0023] The positive electrode external terminal 410 includes a plurality of positive electrode terminal elements 411 and 412 respectively connected to the positive electrode current collecting elements 311 and 312. In the present embodiment, the plurality of positive electrode terminal elements include a pair of positive electrode terminal elements 411 and 412.

[0024] The negative external terminal 420 has substantially the same shape as the positive external terminal 410. That is, the negative external terminal 420 has a plurality of negative terminal elements 421 and 422 (see Figure 1 ).

[0025] The insulating member 500 is provided between the unit case 200 and the external terminal 400. In the present embodiment, the insulating member 500 includes: a pair of positive electrode side insulating elements 510 provided between the cover 220 and the positive electrode external terminal 410; and a pair of negative electrode side insulating elements 520 provided between the cover 220 and the negative electrode external terminal 420. Each positive electrode side insulating element 510 insulates each positive electrode current collecting element 311, 312 from the cover 220. Similarly, each negative electrode side insulating element 520 insulates each negative electrode current collecting element from the cover 220.

[0026] As described above, in the power storage unit 1 of the present embodiment, the positive external terminal 410 has a plurality of positive terminal elements 411 and 412, and the negative external terminal 420 has a plurality of negative terminal elements 421 and 422, so that the current value flowing through each terminal element of the positive terminal elements 411 and 412 and the negative terminal elements 421 and 422 is reduced. Therefore, the deterioration of each insulating element of the positive side insulating element 510 and the negative side insulating element 520 can be suppressed.

[0027] Those skilled in the art should understand that the above exemplary embodiments are specific examples of the following methods.

[0028] The first method is a storage unit comprising: an electrode body; a unit case that accommodates the electrode body; a collector terminal connected to the electrode body; an external terminal connected to the collector terminal and arranged outside the unit case; and an insulating component arranged between the unit case and the external terminal, the collector terminal having a plurality of collector elements respectively connected to the electrode body, and the external terminal having a plurality of terminal elements respectively connected to each of the collector elements.

[0029] In this power storage unit, since the external terminal has a plurality of terminal elements, the value of the current flowing through each terminal element is reduced, thereby suppressing the deterioration of the insulating member.

[0030] According to a second aspect, in the power storage unit according to the first aspect, the insulating member includes an insulating element provided between the unit case and each of the terminal elements.

[0031] The embodiments disclosed this time are illustrative in all aspects and should not be considered restrictive. The scope of the present invention is indicated by the claims rather than the description of the embodiments above, and includes all modifications within the meaning and scope equivalent to the claims.

Claims

1. A power storage unit, characterized in that: have: Electrode body; A unit housing for housing the electrode body; A collector terminal connected to the electrode body; An external terminal connected to the collector terminal and disposed outside the unit housing; and an insulating member disposed between the unit housing and the external terminal, The current collecting terminal has a plurality of current collecting elements respectively connected to the electrode body. The external terminal includes a plurality of terminal elements connected to the current collecting elements, respectively.

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