Search

JP-2026075439-A - Terminal unit and method for manufacturing a terminal unit

JP2026075439AJP 2026075439 AJP2026075439 AJP 2026075439AJP-2026075439-A

Abstract

[Problem] To provide a terminal unit and a method for manufacturing the terminal unit that allows the busbar to be reattached even after it has been removed. [Solution] The terminal unit 20 is provided on a battery cell 10 having an electrode portion. The terminal unit 20 comprises a terminal portion 21 electrically connected to the electrode portion, a joining member 25 having a first joining surface 25A which is one side in a predetermined direction that is joined to the terminal portion 21, and a second joining surface 25B which is the other side in the predetermined direction, and a busbar 27 that is joined to the second joining surface 25B of the joining member 25. The first joining portion 26 that joins the terminal portion 21 and the first joining surface 25A of the joining member 25, and the second joining portion 28 that joins the second joining surface 25B of the joining member 25 and the busbar 27 are provided so as not to overlap when viewed from a predetermined direction. [Selection Diagram] Figure 8

Inventors

  • 水野 智基

Assignees

  • トヨタバッテリー株式会社

Dates

Publication Date
20260508
Application Date
20241022

Claims (6)

  1. A terminal unit provided in a battery cell having an electrode portion, A terminal portion electrically connected to the electrode portion, A joining member having a first joining surface which is one side in a predetermined direction that is joined to the terminal portion, and a second joining surface which is the other side in the predetermined direction, The joining member comprises a busbar joined to the second joining surface of the joining member, A terminal unit in which a first joint portion that joins the terminal portion and the first joint surface of the joining member, and a second joint portion that joins the second joint surface of the joining member and the busbar, are provided so as not to overlap when viewed from the predetermined direction.
  2. The first joint portion is provided on the outer periphery of the joint member, The terminal unit according to claim 1, wherein the second joint is provided in the center of the joint member.
  3. A terminal unit provided in a battery cell having an electrode portion, A terminal portion electrically connected to the electrode portion, A joining member having a contact surface which is one side in a predetermined direction that abuts the terminal portion, and a joining surface which is the other side in the predetermined direction, The joining member comprises a bus bar that is joined to the joining surface of the joining member, The surface of the terminal portion that contacts the connecting member is provided with a joint mark, which is the trace of the removal of the previous connecting member that was joined to that surface. A terminal unit wherein the contact surface of the joining member is provided with a recess for accommodating the joining mark.
  4. The terminal unit according to claim 3, wherein the busbar, the joining member, and the terminal portion are joined by a through-joint portion that penetrates the joining member in the predetermined direction.
  5. The terminal unit according to claim 4, wherein the joint mark and the through joint are provided so as not to overlap when viewed from the predetermined direction.
  6. A method for manufacturing a terminal unit provided in a battery cell having an electrode portion, A terminal portion electrically connected to the electrode portion, A first joining member having a first joining surface which is one surface in a predetermined direction that is joined to the terminal portion, and a second joining surface which is the other surface in the predetermined direction, In the terminal unit having a first busbar joined to the second joining surface of the first joining member, A step of removing the first joining member from the terminal portion, The process involves installing a second joining member having a contact surface on the terminal portion with the first joining member removed, such that the contact surface contacts the terminal portion, A method for manufacturing a terminal unit, comprising the step of attaching a second busbar to the surface of the second joining member opposite to the contact surface.

Description

This invention relates to a terminal unit and a method for manufacturing a terminal unit. Patent Document 1 discloses a battery pack constructed by stacking multiple (in this case, four) cell batteries. In this cell battery, the negative terminal and positive terminal are stacked and fixed together so that they face opposite directions. A busbar for electrically connecting to the positive terminal fixing member is welded to the external terminal of the negative electrode. Japanese Patent Publication No. 2022-7367 This is a perspective view showing a battery cell according to an embodiment.This is a schematic exploded perspective view showing the configuration around the electrode body of the battery cell according to the embodiment.This is a schematic plan view showing the configuration of a battery pack according to the embodiment.This is a perspective view showing a terminal unit provided in a battery cell according to an embodiment.This is a schematic plan view showing a positive electrode terminal unit provided in a battery cell according to an embodiment, showing the state before the busbar is attached.This is a cross-sectional view taken along the line A-A in Figure 5.This is a schematic plan view showing a positive electrode terminal unit provided in a battery cell according to an embodiment, with the busbar attached.This is a cross-sectional view taken along the line B-B in Figure 7.This is a schematic plan view showing a positive electrode terminal unit provided in a battery cell according to an embodiment, with the busbar removed.This is a cross-sectional view taken along the line C-C in Figure 9.This is a schematic plan view showing a positive electrode terminal unit provided in a battery cell according to an embodiment, with the connecting member removed.This is a cross-sectional view taken along the line D-D in Figure 11.This is a schematic plan view showing a positive electrode terminal unit provided in a battery cell according to an embodiment, with a new connecting member installed.This is a cross-sectional view taken along the line E-E in Figure 13.This is a schematic plan view showing a positive electrode terminal unit provided in a battery cell according to an embodiment, with a new busbar installed.This is a cross-sectional view taken along the line F-F in Figure 15.This is a schematic plan view showing a positive electrode terminal unit provided in a battery cell according to an embodiment, with a new connecting member and busbar fixed in place.This is a cross-sectional view taken along the line G-G in Figure 17.This is a schematic vertical cross-sectional view showing a negative electrode terminal unit provided in a battery cell according to an embodiment, with the busbar attached. The following describes a terminal unit and a method for manufacturing the terminal unit according to an embodiment of the present invention, using Figures 1 to 19. For convenience, in this embodiment, arrow X in each figure is referred to as the width direction of the battery cell 10 (hereinafter simply as "width direction"), arrow Y as the thickness direction of the battery cell 10 (hereinafter simply as "thickness direction"), and arrow Z as the height direction of the battery cell 10 (hereinafter simply as "height direction"). Of these directions, one is perpendicular to the other two. As shown in Figures 1 and 2, the terminal units according to this embodiment (specifically, the positive terminal unit 20 and the negative terminal unit 30) are provided on the battery cell 10. Furthermore, as shown in Figure 3, multiple battery cells 10 are combined to form a battery pack 100. The battery cells 10 are, for example, lithium-ion batteries that can be used as power sources for vehicles such as electric vehicles and hybrid vehicles. [Battery pack] First, the configuration of the battery pack 100 will be described. As shown in Figure 3, the battery pack 100 has multiple battery cells 10 arranged in the thickness direction (Y direction). Adjacent battery cells 10 in the thickness direction are connected by busbars (first busbar, second busbar) 27 or busbar 37. Details of busbars 27 and 37 will be described later. [Battery cell] Next, the battery cell 10 will be described. As shown in Figures 1 and 2, the battery cell 10 comprises a case 12 that constitutes the outer shell, a sealing plate 14 provided at the upper end of the case 12, an electrode body (electrode portion) 16 provided inside the case 14, a positive electrode side current collector terminal 18 and a negative electrode side current collector terminal 19 connected to the electrode body 16, and a positive electrode side terminal unit 20 and a negative electrode side terminal unit 30 attached to the sealing plate 14. Case 12 is, for example, made of aluminum. As shown in Figure 2, Case 12 has an opening 12A on the upper side in the height direction into which the electrode body 16 can be inserted. Case 14 is a rectangular box shape, with the length dir