JP-2026075787-A - Energy storage device

Abstract

[Problem] To facilitate the connection of energy storage cells to other components and the maintenance of these connections. [Solution] The energy storage device comprises an energy storage cell 10 and a member (conductor member 211) connected to the connection portion (electrode terminal 11) of the energy storage cell 10. The connection portion of the energy storage cell 10 has, from the tip, a first portion E11 and a second portion E12 which is thinner than the first portion E11, in that order. The member has a housing portion R10 that accommodates the first portion E11 and the second portion E12. The housing portion R10 is provided with a mechanism (engagement portion E22) that allows the insertion of the first portion E11 and prevents the inserted first portion E11 from coming out. [Selection Diagram] Figure 4

Inventors

• 恒川 国大
• 中田 光紀
• 竹下 慎也
• 高橋 直是
• 木村 諒
• 加藤 和仁
• 霜中 俊宏
• 一澤 晃太
• 宮原 謙太

Assignees

• トヨタ自動車株式会社

Dates

Publication Date

20260511

Application Date

20241023

Claims (5)

1. An energy storage device comprising an energy storage cell and a member connected to the connection portion of the energy storage cell, The connection portion of the aforementioned energy storage cell has, from the tip, a first portion and a second portion that is thinner than the first portion, in that order. The member has a housing portion that accommodates the first portion and the second portion, The storage device is provided with a mechanism in the housing that allows the insertion of the first portion and prevents the inserted first portion from coming out.
2. The energy storage device further comprises a wiring board on which the energy storage cells are mounted, The aforementioned wiring board comprises an insulating substrate and a conductive member. The connection portion of the energy storage cell is an electrode terminal, The energy storage device according to claim 1, wherein the member is the conductor member of the wiring board.
3. The energy storage device according to claim 1 or 2, wherein the mechanism includes a ring-shaped member provided at the insertion opening of the housing section.
4. The mechanism includes an engaging portion provided at the insertion opening of the housing portion, The energy storage device according to claim 1 or 2, wherein the first portion has a slit and is configured to deform and engage with the engaging portion when passing inside the engaging portion of the insertion opening.
5. The energy storage device according to claim 1 or 2, wherein the mechanism is configured to fasten the first portion using a snap-fit method.

Description

This disclosure relates to an energy storage device. Chinese Patent Application Publication No. 116686151 (Patent Document 1) discloses an energy storage device comprising multiple energy storage cells fixed within a case (encompassing cavity). The electrode terminals of each energy storage cell are positioned facing the bottom wall of the case. Chinese Patent Application Publication No. 116686151 Specification This is a diagram illustrating the outline of an energy storage device according to an embodiment of the present disclosure.This diagram shows the inside of the energy storage device according to this embodiment.Figure 2 is an end view of the energy storage device on the III-III line.This diagram illustrates the mechanism of the conductive member shown in Figure 3.This figure shows a modified example of the first mechanism shown in Figure 4.This figure shows a modified example of mechanism 2 shown in Figure 4. Embodiments of this disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and their descriptions will not be repeated. In the drawings used below, the X-axis, Y-axis, and Z-axis represent three mutually orthogonal axes. Hereafter, the direction indicated by the arrows on the X-axis, Y-axis, and Z-axis will be indicated by a "+" sign, and the opposite direction by a "-" sign. Figure 1 is a diagram illustrating the outline of the energy storage device according to this embodiment. Referring to Figure 1, the energy storage device B according to this embodiment includes a lower case 100 (first housing member), an upper cover 110 (second housing member), and a shear panel 120 (third housing member), which function as the housing of the energy storage device B. The lower case 100 opens upward (towards +Z) and houses a plurality of energy storage cells and various components related to these energy storage cells. As will be described in detail later, the lower case 100 houses the energy storage cells, a cooler, and a junction box (hereinafter referred to as "J/B") (see Figure 2). The upper cover 110 and the shear panel 120 are each fixed to the lower case 100. The upper cover 110 is positioned above the lower case 100 and functions as a lid for the lower case 100. The shear panel 120 is positioned below the lower case 100 (towards -Z) and suppresses impacts to the lower case 100 due to road surface interference. Furthermore, an exhaust passage is formed inside the share panel 120. When the energy storage device B is mounted on the vehicle, for example, the -Z side is downward (downward in the vertical direction), the +Z side is upward (upward in the vertical direction), the -X side is the front of the vehicle, and the +X side is the rear of the vehicle. Energy storage device B may function as a drive energy storage device, generally referred to as a "battery pack." The vehicle may be an electric vehicle (BEV) or another type of electric vehicle (xEV). The lower part of Figure 1 shows a view of the lower case 100 in an empty state (nothing is contained inside) as seen from above (+Z side). The lower case 100 has a bottom wall 101 (bottom) and a peripheral wall 102 (periphery). The bottom wall 101 includes regions R1 to R5. The peripheral wall 102 includes side walls W1 to W4. Side walls W1, W2, W3, and W4 correspond to the -X side, +X side, -Y side, and +Y side ends of the lower case 100, respectively. Side wall W2 includes side walls W21 to W23. Side walls W21 to W23 are located on the +X side of side walls W3 and W4 which extend in the X direction, with side wall W22 being the furthest to the +X side. Brackets 121 and 122 are provided on side walls W21 and W23, respectively. Discharge valves 151 and 152 are provided on side wall W22. Side wall W22 is connected to side walls W3 and W4 via side walls W21 and W23, respectively. The opposite ends (-X side) of side walls W3 and W4 are connected to each other via side wall W1, which extends in the Y direction. Brackets 131 and 132 are provided on side walls W3 and W4, respectively. Brackets 111 and 112 are provided on side wall W1. Each of side walls W1 to W4 rises from the periphery of the bottom wall 101 toward the +Z side. The internal space of the lower case 100 is enclosed by side walls W1 to W4. The energy storage device B is connected to, for example, the vehicle body (e.g., floor panel) by fastening brackets 111, 112, 121, 122, 131, and 132 to, for example, the vehicle's floor member. The bottom wall 101 is provided with partition walls 103 and 104 extending in the Y direction. Each of the partition walls 103 and 104 may be fastened to the bottom wall 101. Partition wall 104 is located on the +X side of partition wall 103. Each of the partition walls 103 and 104 rises from the bottom wall 101 on the +Z side. Region R5 is a rectangular area located in the center of the lower case 100 and is partitioned by partition walls 103 and 104. Region