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JP-2026075461-A - Current collector and battery

JP2026075461AJP 2026075461 AJP2026075461 AJP 2026075461AJP-2026075461-A

Abstract

[Problem] To suppress heat generation when power is applied. [Solution] The current collector 100A comprises a laminate 110 and a conductive member 120. The laminate 110 includes a support layer 111, a first conductive layer 112, and a second conductive layer 113. The support layer 111 is made of an electrically insulating resin composition. The conductive member 120 is arranged on the edge 110E of the laminate 110. The conductive member 120 is bonded to both the first conductive layer 112 and the second conductive layer 113. [Selection Diagram] Figure 4

Inventors

  • 三村 哲矢
  • 杉原 敦史
  • 盛山 智
  • 芳賀 正宜
  • 古川 正樹
  • 山下 桂汰
  • 坂本 竜斗
  • 永井 秀幸
  • 上田 将史

Assignees

  • トヨタ自動車株式会社

Dates

Publication Date
20260508
Application Date
20241022

Claims (5)

  1. There is a current collector, Laminate and Equipped with a conductive member, The laminate includes a support layer, a first conductive layer, and a second conductive layer. The support layer is made of an electrically insulating resin composition. The conductive member is arranged on the edge of the laminate, The conductive member is a current collector bonded to both the first conductive layer and the second conductive layer.
  2. The first conductive layer is arranged on one side in the thickness direction of the support layer, The second conductive layer is arranged on the other side in the thickness direction, The current collector according to claim 1, wherein the conductive member is joined to both the edge of the first conductive layer and the edge of the second conductive layer.
  3. The first tab, It also has a second tab, The first tab is joined to the surface of the first conductive layer by ultrasonic welding. The first tab is in contact with the conductive member, The second tab is joined to the surface of the second conductive layer by ultrasonic welding. The second tab is joined to the first tab by ultrasonic welding. The current collector according to claim 2, wherein the second tab is in contact with the conductive member.
  4. The current collector according to claim 3, wherein the conductive member is a conductive resin member, which is formed by curing a conductive resin paste, and the conductive resin paste comprises a conductive component containing metal or carbon and an electrically insulating resin component.
  5. It is a battery, Electrode body and Equipped with external terminals, The electrode body includes a first electrode, a second electrode, and a separator. The first electrode comprises a current collector and an active material layer. The current collector includes a laminate and a conductive member. The laminate includes a support layer, a first conductive layer, and a second conductive layer. The support layer is made of an electrically insulating resin composition. The conductive member is arranged on the edge of the laminate, The conductive member is bonded to both the first conductive layer and the second conductive layer. The active material layer is laminated on the first conductive layer, The separator is laminated on the active material layer, The second electrode is laminated on the active material layer via the separator, The external terminal is electrically connected to the first conductive layer, and is a battery.

Description

This disclosure relates to current collectors and batteries. Japanese Patent Publication No. 2024-510696 discloses a conventional electrode plate. The electrode plate includes a current collector, an active material layer, and an electrical connection member. The current collector includes a support layer and a conductive layer. The support layer is made of an insulating material. The conductive layer is installed on one surface of the support layer. The electrical connection member and the current collector are welded together at the edge of the current collector. Special Publication No. 2024-510696 This is a cross-sectional view showing a battery according to one embodiment.This is a cross-sectional view of the electrode body in Figure 1, taken in the direction of the arrow line II-II.This is an exploded view of the first electrode in one embodiment.This is a partial cross-sectional view of the first electrode in Figure 3, as seen in the direction of the IV-IV line arrow. Hereinafter, the current collector and battery will be described with reference to the drawings in accordance with one embodiment of this disclosure. The same or corresponding parts in the drawings are denoted by the same reference numerals, and their descriptions will not be repeated. Figure 1 is a cross-sectional view showing a battery according to one embodiment. The battery 1 shown in Figure 1 is a so-called prismatic battery. Battery 1 may be a rechargeable secondary battery, such as a lithium-ion battery or a nickel-metal hydride battery. Battery 1 can be used, for example, as a cell included in an energy storage module mounted in an electric vehicle. As shown in Figure 1, a battery 1 according to one embodiment of this disclosure comprises an electrode body 10, a case 20, a first external terminal 30A, a second external terminal 30B, a first connecting member 40A, and a second connecting member 40B. First, the components of the battery 1 other than the electrode body 10 will be described. Case 20 is conductive. The conductive portion of Case 20 is made of a metal such as aluminum. Case 20 houses the electrode body 10. Case 20 also houses an electrolyte (not shown). Case 20 includes a case body 21 and a lid 22. The case body 21 includes a bottom wall 21a and a peripheral wall 21b that rises from the bottom wall 21a. The lid 22 is joined to the peripheral wall 21b by welding or other means so as to close the opening in the peripheral wall 21b. The lid 22 has a first connecting hole 22a and a second connecting hole 22b formed therein. The first external terminal 30A and the second external terminal 30B are provided so as to be exposed to the outside in the battery 1. The first connecting member 40A and the second connecting member 40B are conductive. At least a portion of the first connecting member 40A and the second connecting member 40B are located inside the case 20. The first external terminal 30A or the first connecting member 40A is inserted through the first connecting hole 22a. The first external terminal 30A is electrically connected to the first connecting member 40A. Specifically, the first external terminal 30A and the first connecting member 40A are joined to each other. The first connecting member 40A is joined to the electrode body 10. Thus, the first external terminal 30A is electrically connected to the electrode body 10. The second external terminal 30B or the second connecting member 40B is inserted through the second connecting hole 22b. The second external terminal 30B is electrically connected to the second connecting member 40B. Specifically, the second external terminal 30B and the second connecting member 40B are joined to each other. The second connecting member 40B is joined to the electrode body 10. Thus, the second external terminal 30B is electrically connected to the electrode body 10. In this embodiment, the first external terminal 30A is the positive terminal, and the second external terminal 30B is the negative terminal. The first external terminal 30A and the second external terminal 30B are aligned in the second direction D2. The second direction D2 is perpendicular to the first direction D1. Next, the electrode bodies 10 will be described. The battery 1 according to this embodiment comprises a plurality of electrode bodies 10. Typically, the battery 1 comprises two electrode bodies 10. These electrode bodies 10 are aligned in a third direction D3. The third direction D3 is perpendicular to both the first direction D1 and the second direction D2. The following description focuses on one of the multiple electrode bodies 10. Note that each of the multiple electrode bodies 10 may have the configuration shown below. Figure 2 is a cross-sectional view of the electrode body in Figure 1, taken in the direction of the arrow II-II. As shown in Figures 1 and 2, the electrode body 10 includes a first electrode 11A, a second electrode 11B, and a separator 12. The electrode body 10 is wound so that the first e