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JP-2026075321-A - Energy storage cell

JP2026075321AJP 2026075321 AJP2026075321 AJP 2026075321AJP-2026075321-A

Abstract

[Problem] To provide an energy storage cell that can suppress damage to the electrode tabs. [Solution] The energy storage cell 100 comprises an electrode body 10 including a first electrode 10A and a second electrode 10B, a first connecting member 50A and a second connecting member 50B positioned opposite the electrode body 10, a first tab 90A that electrically connects the first electrode 10A and the first connecting member 50A, and a foam layer 140. The foam layer 140 supports the first tab 90A by contacting it. [Selection Diagram] Figure 10

Inventors

  • 千原 真志
  • 志村 陽祐
  • 柿下 健一
  • 中嶋 悟史
  • 粟野 宏基
  • 永野 泰章
  • 小倉 正也
  • 佐藤 綾祐

Assignees

  • トヨタ自動車株式会社
  • トヨタバッテリー株式会社

Dates

Publication Date
20260508
Application Date
20241022

Claims (12)

  1. An electrode body including an electrode sheet, A current collector plate is positioned opposite the electrode body, At least one electrode tab electrically connects the electrode sheet and the current collector plate, A foamed layer containing foam, The foam layer supports the at least one electrode tab by contacting the at least one electrode tab in the energy storage cell.
  2. The at least one electrode tab includes a portion that is positioned on the current collector plate, The energy storage cell according to claim 1, wherein the foam layer is in contact with the current collector plate side portion.
  3. The at least one electrode tab is The sheet-side portion that is placed on the electrode sheet, It includes a connecting portion that connects the current collector plate side portion and the sheet side portion, The energy storage cell according to claim 2, wherein the foam layer is spaced apart from the connection portion.
  4. The electrode sheet is A current collector having a first surface and a second surface arranged in the direction of arrangement, The current collector includes an electrode active material layer, The aforementioned current collector is The coated portion to which the electrode active material layer is coated, The electrode active material layer is not coated, and there is an uncoated portion located on the current collector plate side of the coated portion. The at least one electrode tab is A first electrode foil is provided on the first uncoated portion of the first surface corresponding to the uncoated portion, The invention includes a second electrode foil provided on the second uncoated portion of the second surface corresponding to the uncoated portion, The first electrode foil has a first protruding portion that protrudes from the first uncoated portion toward the current collector plate, The second electrode foil has a second protruding portion that protrudes from the second uncoated portion toward the current collector plate, The first protruding portion is joined to the second protruding portion, The energy storage cell according to any one of claims 1 to 3, wherein the foamed layer supports the joint portion to which the first protruding portion and the second protruding portion are joined.
  5. The aforementioned at least one electrode tab includes a plurality of electrode tabs, The plurality of electrode tabs are arranged in the direction of the arrangement, The energy storage cell according to claim 4, wherein in each of the plurality of electrode tabs, the first electrode foil is positioned on one side of the second electrode foil in the arrangement direction.
  6. The electrode body is a wound electrode body in which the electrode sheet is wound around a winding axis, The plurality of electrode tabs are arranged in a line with spacing between them in the winding direction of the wound electrode body. The aforementioned arrangement direction is perpendicular to the winding direction, The aforementioned multiple electrode tabs are First electrode tab and The arrangement of the first electrode foil and the second electrode foil includes a second electrode tab that is opposite to the first electrode tab, The energy storage cell according to claim 5, wherein the first electrode tab and the second electrode tab are arranged alternately in the winding direction.
  7. The aforementioned foam contains a fire extinguishing gas, as described in any one of claims 1 to 3, for the energy storage cell.
  8. The aforementioned foam layer is One side portion and Including the other portion which is provided closer to the at least one electrode tab than the one portion, The energy storage cell according to any one of claims 1 to 3, wherein the density of the foam in the other portion is higher than the density of the foam in the one portion.
  9. The aforementioned foam layer is The first direction side portion and Including a second direction portion provided closer to at least one electrode tab than the first direction portion, The energy storage cell according to any one of claims 1 to 3, wherein the density of the foam in the first direction portion is higher than the density of the foam in the second direction portion.
  10. The foamed layer includes a first foamed layer and a second foamed layer sandwiching the at least one electrode tab, If the direction in which each of the first foam layer and the second foam layer extends along the at least one electrode tab is defined as the stretching direction, The first foam layer is Part 1 and, It has a second portion provided on one side of the first portion in the direction of extension, The aforementioned second foam layer is Part 3 and, It has a fourth portion provided on one side of the third portion in the extending direction and positioned offset from the first portion in the extending direction, The density of the foam in the first portion is higher than the density of the foam in the second portion. The energy storage cell according to any one of claims 1 to 3, wherein the density of the foam in the fourth portion is higher than the density of the foam in the third portion.
  11. The case further comprises a case for housing the electrode body, An exhaust valve is provided in the wall of the aforementioned case. The energy storage cell according to any one of claims 1 to 3, wherein the exhaust valve is disposed on the opposite side of the electrode body from the foam layer.
  12. The aforementioned foamed layer is insulating, as described in any one of claims 1 to 3, for the energy storage cell.

Description

This disclosure relates to energy storage cells. Japanese Patent Publication No. 2023-547686 (Patent Document 1) discloses a battery cell comprising an electrode assembly, an adapter piece, and a tab. The tab extends from the electrode assembly toward the adapter piece and is connected to the adapter piece. Special Publication No. 2023-547686 This diagram shows the configuration of a vehicle equipped with an energy storage device.This is a perspective view showing the configuration of the energy storage device and frame members.This is a cross-sectional view along the line III-III in Figure 2.This is a perspective view showing the configuration of a storage cell according to the first embodiment.This is an exploded perspective view showing the configuration of a storage cell according to the first embodiment.This is a cross-sectional view taken in the direction of the arrow along the line VI-VI in Figure 4.This is a cross-sectional view taken in the direction of the line VII-VII arrow in Figure 6.This is a partially enlarged cross-sectional view showing the configuration of the first electrode and the first tab according to the first embodiment.This is a partially enlarged cross-sectional view showing the configuration of the second electrode.This is a schematic cross-sectional view taken in the direction of the arrow X-X in Figure 6.Figure 10 is a magnified view of the area near the foamed layer.This is a schematic cross-sectional view showing the configuration of a storage cell according to the second embodiment.This is a partially enlarged cross-sectional view showing the configuration of the first electrode and the first tab according to the second embodiment.This is a schematic plan view showing the first tab and electrode body according to the second embodiment.This figure shows the state in which the winding of the first electrode has been unwound according to the second embodiment.This is a cross-sectional view showing a first modified example of the first embodiment.This is a cross-sectional view showing a first modified example of the second embodiment.This is a cross-sectional view showing a second modified example of the first embodiment.This is a cross-sectional view showing a second modified example of the second embodiment.This is a cross-sectional view showing a third modified example of the second embodiment.This is a cross-sectional view showing a fourth modified example of the second embodiment.This is a cross-sectional view showing a third modified example of the first embodiment. Embodiments of this disclosure will be described with reference to the drawings. In the drawings referenced below, the same or equivalent components are given the same number. [First Embodiment] Figure 1 is a schematic diagram showing a vehicle equipped with a power storage device according to a first embodiment of the present disclosure. As shown in Figure 1, the vehicle 1 comprises a vehicle body 2 and a power storage device 3. Examples of the vehicle 1 include a hybrid electric vehicle, a plug-in hybrid electric vehicle, and a battery electric vehicle. The power storage device 3 may be installed in electrical equipment other than an electric vehicle (for example, a stationary power storage device). In this specification, the X, Y, and Z directions are mutually orthogonal directions. For example, the X and Y directions may be the front-rear and left-right directions, respectively, when the power storage device 3 is mounted on an electric vehicle. The Z direction may be the up-down direction. The vehicle body 2 includes a frame member 4. The frame member 4 is located at the bottom of the vehicle body 2. The frame member 4 is formed in a roughly rectangular cylindrical shape, enclosing the energy storage device 3. The energy storage device 3 is attached to the frame member 4. Figure 2 is a schematic perspective view showing the energy storage device 3 and the frame member 4. As shown in Figure 2, the energy storage device 3 comprises multiple energy storage stacks 5. Each energy storage stack 5 is formed in a rectangular parallelepiped shape, elongated in the Y direction. Multiple energy storage stacks 5 are arranged in a line along the X direction. Figure 3 is a cross-sectional view (cross-sectional view of the energy storage stack 5) taken in the direction of the arrow III-III in Figure 2. Each energy storage stack 5 includes a plurality of energy storage cells 100 arranged in the Y direction. A pressure relief valve SV is formed at the bottom of each energy storage cell 100. Note that the pressure relief valve SV is an example of an "exhaust valve" in this disclosure. Figure 4 is a perspective view showing a storage cell 100 according to the first embodiment. As shown in Figure 4, the storage cell 100 is a so-called prismatic battery. The storage cell 100 is a secondary battery configured to be chargeable and dischargeable. The storage cell 100 may be a secondary battery such as a lithium-ion battery or a ni