Power storage cell

Abstract

To provide a power storage cell capable of suppressing deterioration of an insulating material.SOLUTION: A power storage cell 1 includes an electrode assembly, a cell case 200 that houses the electrode assembly, a current collecting terminal connected to the electrode assembly, an external terminal 400 connected to the current collecting terminal and provided outside the cell case, and an insulating member 500 provided between the cell case and the external terminal. The current collecting terminal has a plurality of current collecting elements each connected to the electrode assembly. The external terminal 400 includes a plurality of terminal elements 411, 412, 421, 422 respectively connected to the current collecting elements.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an energy storage cell. [Background technology]

[0002] Japanese Patent Application Laid-Open No. 2011-175913 discloses a stacked battery including a stack, a pair of positive electrode current collecting terminals and a pair of negative electrode current collecting terminals connected to the stack, a positive electrode tab connected to the pair of positive electrode current collecting terminals, a negative electrode tab connected to the pair of negative electrode current collecting terminals, and an exterior body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-175913 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a power storage cell such as that described in JP 2011-175913 A, an insulating member may be disposed between a cell case such as an exterior body and an external terminal for the purpose of sealing, etc. In this case, when the output becomes large, there is a concern that the insulating member may deteriorate due to Joule heat associated with a large current.

[0005] An object of the present disclosure is to provide an energy storage cell capable of suppressing deterioration of insulating members. [Means for solving the problem]

[0006] A storage cell according to one aspect of the present disclosure comprises an electrode body, a cell case that houses the electrode body, a collector terminal connected to the electrode body, an external terminal connected to the collector terminal and provided outside the cell case, and an insulating member provided between the cell case and the external terminal, wherein the collector terminal has a plurality of collector elements each connected to the electrode body, and the external terminal has a plurality of terminal elements each connected to each of the collector elements. Effect of the Invention

[0007] According to the present disclosure, it is possible to provide an energy storage cell capable of suppressing deterioration of an insulating member. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view illustrating a storage cell according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] FIG. 2 is a cross-sectional view taken along line III-III in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present disclosure will now be described with reference to the accompanying drawings, in which the same or corresponding components are designated by the same reference numerals.

[0010] Fig. 1 is a perspective view showing a schematic diagram of a storage cell according to an embodiment of the present disclosure, Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1, and Fig. 3 is a cross-sectional view taken along line III-III in Fig. 1.

[0011] As shown in FIGS. 1 to 3, the energy storage cell 1 includes an electrode assembly 100, a cell case 200, a current collecting terminal 300 (see FIG. 2), an external terminal 400, and an insulating member 500.

[0012] The electrode assembly 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 in a long rectangular shape. The electrode assembly 100 may be formed by winding the positive electrode sheet, the separator, and the negative electrode sheet. The electrode assembly 100 includes a plurality of positive electrode tabs 110 and a plurality of negative electrode tabs (not shown).

[0013] The positive electrode sheet includes a positive electrode foil and a positive electrode composite layer provided on the positive electrode foil. The positive electrode foil has an uncoated portion where the positive electrode composite layer is not formed, and a plurality of positive electrode tabs 110 are formed in the uncoated portion. Each positive electrode tab 110 protrudes, for example, to one side in the width direction (the left-right direction in FIG. 2).

[0014] The negative electrode sheet includes a negative electrode foil and a negative electrode composite layer formed on the negative electrode foil. The negative electrode foil has an uncoated portion where the negative electrode composite layer is not formed, and a plurality of negative electrode tabs are formed in the uncoated portion. Each negative electrode tab protrudes, for example, to the other side in the width direction.

[0015] The cell case 200 houses the electrode assembly 100. The cell case 200 is sealed. The cell case 200 has a case body 210 and a lid 220.

[0016] Case body 210 has a shape that opens upward. Case body 210 is made of a metal such as aluminum. Case body 210 has a bottom wall (not shown) and peripheral walls 214. The bottom wall is formed in a rectangular, flat plate shape. Peripheral wall 214 stands upright from the bottom wall. Peripheral wall 214 is formed in a square tube shape.

[0017] The lid 220 closes the opening of the case body 210. The lid 220 is connected to the opening by welding or the like. The lid 220 is formed in a flat plate shape. The lid 220 is made of a metal such as aluminum.

[0018] 2, the current collecting terminal 300 is connected to the electrode assembly 100. Specifically, the current collecting terminal 300 has a positive electrode current collecting terminal 310 connected to each positive electrode tab 110, and a negative electrode current collecting terminal (not shown) connected to each negative electrode tab.

[0019] The positive electrode current collecting terminal 310 has a plurality of positive electrode current collecting elements 311, 312 (see FIG. 3), each connected to each positive electrode tab 110. In this embodiment, the plurality of positive electrode current collecting elements has a pair of positive electrode current collecting elements 311, 312. The plurality of positive electrode current collecting elements 311, 312 may be formed in a shape independent of each other, or may be formed in a shape branching midway from a single current collecting element connected to each positive electrode tab 110.

[0020] The negative current collecting terminal is formed in substantially the same shape as the positive current collecting terminal 310. In other words, the negative current collecting terminal has a plurality of negative current collecting elements.

[0021] The external terminal 400 is connected to the current collecting terminal 300, and is provided outside the cell case 200. Specifically, the external terminal 400 is fixed to the upper surface of the lid 220 of the cell case 200. The external terminal 400 has a positive electrode external terminal 410 and a negative electrode external terminal 420.

[0022] The positive external terminal 410 has a plurality of positive terminal elements 411, 412 each connected to each of the positive current collecting elements 311, 312. In this embodiment, the plurality of positive terminal elements includes a pair of the positive terminal elements 411, 412.

[0023] 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, 422 (see FIG. 1).

[0024] The insulating member 500 is provided between the cell case 200 and the external terminal 400. In this embodiment, the insulating member 500 has a pair of positive electrode side insulating elements 510 provided between the lid 220 and the positive electrode external terminal 410, and a pair of negative electrode side insulating elements 520 provided between the lid 220 and the negative electrode external terminal 420. Each positive electrode side insulating element 510 insulates between each positive electrode current collecting element 311, 312 and the lid 220. Similarly, each negative electrode side insulating element 520 insulates between each negative electrode current collecting element and the lid 220.

[0025] As described above, in the energy storage cell 1 of this embodiment, the positive external terminal 410 has a plurality of positive terminal elements 411, 412, and the negative external terminal 420 has a plurality of negative terminal elements 421, 422, so that the value of the current flowing through each of the terminal elements 411, 412, 421, 422 is reduced. As a result, deterioration of each of the insulating elements 510, 520 is suppressed.

[0026] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0027] [Aspect 1] An electrode body; A cell case that accommodates the electrode assembly; A current collecting terminal connected to the electrode body; an external terminal connected to the current collecting terminal and provided outside the cell casing; an insulating member provided between the cell casing and the external terminal; the current collecting terminal has a plurality of current collecting elements each connected to the electrode body, The external terminal of the energy storage cell includes a plurality of terminal elements each connected to each of the current collecting elements.

[0028] In this energy storage cell, the external terminal has a plurality of terminal elements, so that the value of the current flowing through each terminal element is reduced, thereby suppressing deterioration of the insulating member.

[0029] [Aspect 2] 2. The energy storage cell of claim 1, wherein the insulating member has an insulating element provided between the cell casing and each of the terminal elements.

[0030] It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered as limiting. The scope of the present disclosure is indicated by the claims, not by the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0031] 1 storage cell, 100 electrode body, 110 positive electrode tab, 200 cell case, 210 case body, 220 lid, 300 current collecting terminal, 310 positive electrode current collecting terminal, 311, 312 positive electrode current collecting element, 400 external terminal, 410 positive electrode external terminal, 420 negative electrode external terminal, 411, 412 positive electrode terminal element, 421, 422 negative electrode terminal element, 500 insulating member, 510 positive electrode side insulating element, 520 negative electrode side insulating element.

Claims

[Claim 1] An electrode body; A cell case that accommodates the electrode assembly; A current collecting terminal connected to the electrode body; an external terminal connected to the current collecting terminal and provided outside the cell casing; an insulating member provided between the cell casing and the external terminal; the current collecting terminal has a plurality of current collecting elements each connected to the electrode body, The external terminal of the energy storage cell includes a plurality of terminal elements each connected to each of the current collecting elements.

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