Energy 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 a storage cell.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2011-175913 discloses a laminated battery including a laminate, a pair of positive electrode current collecting terminals and a pair of negative electrode current collecting terminals connected to the laminate, 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

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a storage cell as described in Japanese Patent Application Laid-Open No. 2011-17591, an insulating member may be disposed between a cell case such as an exterior body and an external terminal for the purpose of sealing or the like. In this case, when the output increases, 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 a storage cell capable of suppressing deterioration of an insulating member.

Means for Solving the Problems

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

[0007] According to this disclosure, it is possible to provide an energy storage cell that can suppress the deterioration of insulating materials. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic perspective view of an energy storage cell in one embodiment of the present disclosure. [Figure 2] This is a cross-sectional view taken along line II-II in Figure 1. [Figure 3] This is a cross-sectional view taken along line III-III in Figure 1. [Modes for carrying out the invention]

[0009] Embodiments of this disclosure will be described with reference to the drawings. In the drawings referred to below, the same or equivalent components are given the same number.

[0010] Figure 1 is a schematic perspective view of an energy storage cell in one embodiment of the present disclosure. Figure 2 is a cross-sectional view taken along line II-II in Figure 1. Figure 3 is a cross-sectional view taken along line III-III in Figure 1.

[0011] As shown in Figures 1 to 3, the energy storage cell 1 comprises an electrode body 100, a cell case 200, a current collection terminal 300 (see Figure 2), an external terminal 400, and an insulating member 500.

[0012] The electrode body 100 includes a positive electrode sheet, a separator, and a negative electrode sheet. The positive electrode sheet, negative electrode sheet, and separator are formed in a long rectangular shape. The electrode body 100 may be formed by winding the positive electrode sheet, separator, and negative electrode sheet. The electrode body 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 area where the positive electrode composite layer is not formed, and a plurality of positive electrode tabs 110 are formed on this uncoated area. Each positive electrode tab 110 protrudes, for example, to one side in the width direction (left-right direction in Figure 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 area where the negative electrode composite layer is not formed, and a plurality of negative electrode tabs are formed on this uncoated area. Each negative electrode tab protrudes, for example, to the other side in the width direction.

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

[0016] The case body 210 has an upward-opening shape. The case body 210 is made of a metal such as aluminum. The case body 210 has a bottom wall (not shown) and a peripheral wall 214. The bottom wall is formed in a rectangular and flat shape. The peripheral wall 214 rises from the bottom wall. The peripheral wall 214 is formed in a rectangular tubular 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] As shown in FIG. 2, the current collecting terminal 300 is connected to the electrode body 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 the present embodiment, the plurality of positive electrode current collecting elements have a pair of positive electrode current collecting elements 311, 312. The plurality of positive electrode current collecting elements 311, 312 may be formed in independent shapes from each other, 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.

[0020] 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.

[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 in 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 electrode external terminal 410 has a plurality of positive electrode terminal elements 411, 412 each connected to each positive electrode current collecting element 311, 312. In the present embodiment, the plurality of positive electrode terminal elements have a pair of positive electrode terminal elements 411, 412.

[0023] [[ID=​​​​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-side insulating elements 510 provided between the lid 220 and the positive external terminal 410, and a pair of negative-side insulating elements 520 provided between the lid 220 and the negative external terminal 420. Each positive-side insulating element 510 insulates each positive current collector element 311, 312 from the lid 220. Similarly, each negative-side insulating element 520 insulates each negative current collector element from the lid 220.

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

[0026] Those skilled in the art will understand that the exemplary embodiments described above are specific examples of the following embodiments.

[0027] [Aspect 1] Electrode body and A cell case for housing the electrode body, A current collector terminal connected to the electrode body, It is connected to the current collection terminal and has an external terminal provided outside the cell case, The cell case and the external terminal are provided with an insulating member, The current collection terminal has a plurality of current collection elements, each of which is connected to the electrode body. The external terminals have a plurality of terminal elements, each of which is connected to one of the current collecting elements, in the energy storage cell.

[0028] In this energy storage cell, the external terminal has multiple terminal elements, which reduces the current flowing through each terminal element. Therefore, the deterioration of the insulating material is suppressed.

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

[0030] It should be noted that the embodiments disclosed herein are illustrative in all respects and not restrictive. The scope of this disclosure is defined by the claims rather than the description of the embodiments above, and includes all modifications within the meaning and scope equivalent to the claims. [Explanation of Symbols]

[0031] 1 Energy storage cell, 100 Electrode body, 110 Positive electrode tab, 200 Cell case, 210 Case body, 220 Lid, 300 Current collector terminal, 310 Positive current collector terminal, 311, 312 Positive current collector element, 400 External terminal, 410 Positive external terminal, 420 Negative external terminal, 411, 412 Positive terminal element, 421, 422 Negative terminal element, 500 Insulating material, 510 Positive side insulating element, 520 Negative side insulating element.

Claims

[Claim 1] Electrode body and A cell case for housing the electrode body, A positive electrode current collector terminal and a negative electrode current collector terminal connected to the electrode body, Connected to the positive electrode current collection terminal, and a positive electrode external terminal provided outside the cell case, It is connected to the negative electrode current collection terminal and has a negative electrode external terminal provided outside the cell case, The cell case comprises an insulating member provided between the positive external terminal and the negative external terminal, The positive electrode current collector terminal has a plurality of positive electrode current collector elements, each of which is connected to the electrode body. The negative electrode current collector terminal has a plurality of negative electrode current collector elements, each of which is connected to the electrode body. The aforementioned cell case is A case body having an upward-facing opening, The case body has a lid that closes the opening, The positive external terminals each have a pair of positive terminal elements that are connected to each of the positive current collecting elements and fixed to the upper surface of the cover. The negative external terminals each have a pair of negative terminal elements that are connected to each of the negative current collecting elements and fixed to the upper surface of the cover. The pair of negative terminal elements are provided at a position away from the pair of positive terminal elements in the width direction perpendicular to the vertical direction of the cell case. The gap between the pair of positive terminal elements in the thickness direction, which is perpendicular to both the vertical direction and the width direction, is smaller than the dimension of each positive terminal element in the thickness direction. A storage cell in which the gap between the pair of negative electrode terminal elements in the thickness direction is smaller than the dimension of each of the negative electrode terminal elements in the thickness direction.

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