Electricity storage unit

Abstract

The utility model relates to an electric power storage unit, which comprises 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 utility model relates to an electricity storage unit. Background Art

[0002] Japanese Patent Application Laid-Open No. 2011-175913 discloses a stacked battery comprising: a stacked body; a pair of positive and negative current collecting terminals connected to the stacked body; a positive tab connected to the pair of positive current collecting terminals; a negative tab connected to the pair of negative current collecting terminals; and an exterior body.

[0003] In the power storage cell described in Japanese Patent Application Laid-Open No. 2011-175913, an insulating member is sometimes disposed between the cell case (such as an exterior body) and the external terminals for sealing purposes. In this case, as the output increases, Joule heat associated with the high current may degrade the insulating member. Utility Model Content

[0004] In view of the above-mentioned 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 shell 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 shell; and an insulating component arranged between the unit shell 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] The embodiment 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] Electrode assembly 100 includes a positive electrode sheet, a separator, and a negative electrode sheet. The positive electrode sheet, negative electrode sheet, and separator are formed into a long rectangular shape. Electrode assembly 100 can be formed by winding the positive electrode sheet, separator, and negative electrode sheet. Electrode assembly 100 includes multiple positive electrode tabs 110 and multiple negative electrode tabs (not shown).

[0014] The positive electrode sheet includes a positive electrode foil and a positive electrode mixed material layer provided on the positive electrode foil. An uncoated portion where no positive electrode mixed material layer is 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 One side protrudes in the left and right directions.

[0015] The negative electrode sheet includes a negative electrode foil and a negative electrode mixture layer formed on the negative electrode foil. The negative electrode foil has an uncoated portion where the negative electrode mixture layer is not formed. Multiple negative electrode tabs are formed in this uncoated portion. Each negative electrode tab protrudes, for example, to the other side in the width direction.

[0016] The cell case 200 houses the electrode assembly 100 . The cell case 200 is sealed and includes a case body 210 and a lid 220 .

[0017] The housing body 210 has a Figure 1 On one side ( Figure 1 The housing body 210 is formed 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 into a rectangular, flat plate. The peripheral wall 214 rises from the bottom wall. The peripheral wall 214 is formed into a square cylindrical 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 and is made of a metal such as aluminum.

[0019] like Figure 2As shown, the current collecting terminal 300 is connected to the electrode body 100. Specifically, the current collecting terminal 300 includes a positive current collecting terminal 310 connected to each positive electrode tab 110 and a negative current collecting 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 (see Figure 3 In this embodiment, the plurality of positive electrode current collecting elements include a pair of positive electrode current collecting elements 311 and 312. The plurality of positive electrode current collecting elements 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 collecting element 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 includes a plurality of negative electrode current collecting elements.

[0022] The external terminal 400 is connected to the current 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 connected to the positive electrode current collecting elements 311 and 312. In this embodiment, the plurality of positive electrode terminal elements includes 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 includes a plurality of negative terminal elements 421 and 422 (see Figure 1 ).

[0025] The insulating component 500 is disposed between the cell case 200 and the external terminal 400. In this embodiment, the insulating component 500 includes a pair of positive-side insulating elements 510 disposed between the cover 220 and the positive external terminal 410, and a pair of negative-side insulating elements 520 disposed between the cover 220 and the negative external terminal 420. Each positive-side insulating element 510 insulates each positive electrode current collecting element 311, 312 from the cover 220. Similarly, each negative-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 this embodiment, the positive external terminal 410 includes a plurality of positive terminal elements 411 and 412, and the negative external terminal 420 includes a plurality of negative terminal elements 421 and 422. Therefore, the current flowing through each of the positive terminal elements 411 and 412 and the negative terminal elements 421 and 422 is reduced. Consequently, degradation of each 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 aspects.

[0028] The first embodiment is a storage unit comprising: an electrode body; a unit case accommodating the electrode body; a collector terminal connected to the electrode body; an external terminal connected to the collector terminal and disposed outside the unit case; and an insulating component disposed 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 includes a plurality of terminal elements, the current flowing through each terminal element is reduced, thereby suppressing degradation of the insulating member.

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

[0031] The embodiments disclosed herein are illustrative in all respects and should not be construed as restrictive. The scope of the present invention is indicated by the technical claims rather than the description of the embodiments above, and all modifications within the meaning and scope equivalent to the technical claims are also included.

Claims

1. A power storage unit, characterized in that: have: Electrode body; a unit housing for accommodating the electrode body; a current collecting terminal connected to the electrode body; an external terminal connected to the current collecting 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 connected to the electrode bodies respectively. The external terminal includes a plurality of terminal elements connected to the current collecting elements, respectively.

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