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EP-4742371-A1 - POWER STORAGE DEVICE AND VEHICLE

EP4742371A1EP 4742371 A1EP4742371 A1EP 4742371A1EP-4742371-A1

Abstract

A power storage device includes: a power storage module (11) including a plurality of power storage cells (30); an accommodation case that accommodates the power storage module (11); a bus bar module (29) provided in the accommodation case and electrically connecting the plurality of power storage cells (30); and a biasing member (14) that improves close contact between the plurality of power storage cells (30) and the bus bar module (29). Since the biasing member (14) improves close contact between the plurality of power storage cells and the bus bar module, the state of contact between the power storage cells and bus bars can be improved.

Inventors

  • TSUNEKAWA, KUNIHIRO
  • NAKADA, KOKI
  • TAKESHITA, SHINYA
  • TAKAHASHI, NAOYUKI
  • KIMURA, RYO
  • KATO, KAZUHITO
  • Shimonaka, Toshihiro
  • ICHISAWA, Kota
  • MIYAHARA, KENTA

Assignees

  • TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date
20260513
Application Date
20251010

Claims (7)

  1. A power storage device (1, 1A, 1B, 1C) comprising: a power storage module (11) including a plurality of power storage cells (30, 30C); an accommodation case (10) that accommodates the power storage module (11); a bus bar module (29, 29C) provided in the accommodation case (10) and electrically connecting the plurality of power storage cells (30, 30C); and a biasing member (14, 14A, 14C) that improves close contact between the plurality of power storage cells (30, 30C) and the bus bar module (29).
  2. A power storage device (1, 1A, 1B, 1C) comprising: a power storage module (11) including a plurality of power storage cells (30, 30C); an accommodation case (10) that accommodates the power storage module (11); a bus bar module (29) provided in the accommodation case (10) and electrically connecting the plurality of power storage cells (30, 30C); and a biasing member (14, 14A, 14C) disposed on a side opposite to the bus bar module (29, 29C) with respect to the power storage module (11), wherein the biasing member (14, 14A, 14C) biases the power storage module (11) toward the bus bar module (29, 29C).
  3. The power storage device (1, 1A, 1B, 1C) according to claim 1 or 2, wherein the biasing member (14, 14A, 14C) is disposed adjacent to the power storage module (11), the bus bar module (29, 29C) is disposed on a side opposite to the biasing member (14, 14A, 14C) with respect to the power storage module (11), and the biasing member (14, 14A, 14C) biases the power storage module (11) toward the bus bar module (29, 29C).
  4. The power storage device (1A) according to claim 1 or 2, wherein the biasing member (14A) includes a first plate portion (51A) disposed adjacent to the power storage module (11), a second plate portion (52A) disposed to be spaced apart from the first plate portion (51A), and an intermediate member (53A) disposed between the first plate portion (51A) and the second plate portion (52A) and elastically deformed, and a coolant passage (54) through which a coolant can flow is formed between the first plate portion (51A) and the second plate portion (52A) by the intermediate member (53A).
  5. The power storage device (1B) according to claim 1 or 2, further comprising an elastic member (75) disposed between the power storage module (11) and the biasing member (14).
  6. The power storage device (1, 1A) according to claim 1 or 2, wherein the bus bar module (29) is disposed below the power storage module (11), and the biasing member (14, 14A) is disposed on an upper surface of the power storage module (11).
  7. A vehicle (2) comprising the power storage device (1, 1A, 1B, 1C) according to any one of claims 1 to 6, wherein the vehicle (2) comprises a vehicle main body (3) including a floor panel (4), and the power storage device (1, 1A, 1B, 1C) is disposed on a lower surface of the floor panel (4).

Description

CROSS REFERENCE TO RELATED APPLICATIONS This nonprovisional application is based on Japanese Patent Application No. 2024-195241 filed on November 7, 2024 with the Japan Patent Office, the entire contents of which are hereby incorporated by reference. BACKGROUND Field The present disclosure relates to a power storage device and a vehicle. Description of the Background Art Conventionally, various power storage devices have been proposed. For example, a power storage device described in Chinese Patent Application Publication No. 116686151 includes an accommodation case, and a plurality of power storage cells accommodated in the accommodation case. Each power storage cell includes a cell case, and a positive electrode external terminal and a negative electrode external terminal provided on a lower surface of the cell case. SUMMARY In the power storage device described above, bus bars for electrically connecting the power storage cells are disposed on lower surfaces of the power storage cells. Here, when the state of contact between the power storage cells and the bus bars is deteriorated, electrical connection of the power storage cells is broken. The present disclosure has been made in light of the aforementioned problem, and an object thereof is to provide a power storage device and a vehicle capable of improving the state of contact between power storage cells and bus bars. A power storage device includes: a power storage module including a plurality of power storage cells; an accommodation case that accommodates the power storage module; a bus bar module provided in the accommodation case and electrically connecting the plurality of power storage cells; and a biasing member that improves close contact between the plurality of power storage cells and the bus bar module. In the power storage device, the biasing member is disposed adjacent to the power storage module, the bus bar module is disposed on a side opposite to the biasing member with respect to the power storage module, and the biasing member biases the power storage module toward the bus bar module. The biasing member includes a first plate portion disposed adjacent to the power storage module, a second plate portion disposed to be spaced apart from the first plate portion, and an intermediate member disposed between the first plate portion and the second plate portion and elastically deformed, and a coolant passage through which a coolant can flow is formed between the first plate portion and the second plate portion by the intermediate member. The power storage device further includes an elastic member disposed between the power storage module and the biasing member. The bus bar module is disposed below the power storage module, and the biasing member is disposed on an upper surface of the power storage module. The foregoing and other objects, features, aspects and advantages of the present disclosure will become more apparent from the following detailed description of the present disclosure when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view schematically showing a vehicle 2 having a power storage device 1 mounted thereon.Fig. 2 is an exploded perspective view showing power storage device 1.Fig. 3 is a perspective view showing a power storage cell 30.Fig. 4 is a plan view showing a cooling device 12 and the like.Fig. 5 is a perspective view showing cooling device 12.Fig. 6 is a perspective view showing an insulating plate 24, a bus bar module 29, and one power storage cell 30.Fig. 7 is a cross sectional view taken along a line VII-VII shown in Fig. 4.Fig. 8 is a cross sectional view showing a power storage device 1A.Fig. 9 is an exploded perspective view showing a biasing member 14A.Fig. 10 is a cross sectional view showing a power storage device 1B according to a second modification.Fig. 11 is a cross sectional view showing a power storage device 1C.Fig. 12 is a perspective view showing a power storage cell 30C. DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present disclosure will be described with reference to the drawings. It should be noted that, in the drawings referred to below, the same or corresponding members will be designated by the same reference numerals. Fig. 1 is a side view schematically showing a vehicle 2 having a power storage device 1 mounted thereon. Vehicle 2 includes a vehicle main body 3. Vehicle main body 3 includes a floor panel 4, and floor panel 4 is provided at a bottom portion of vehicle main body 3. Floor panel 4 divides an external space of the vehicle and an internal space of the vehicle. In addition, power storage device 1 is disposed on a lower surface of floor panel 4. It should be noted that vehicle main body 3 includes a pair of side members (not shown), the side members are disposed to be spaced apart from each other in a vehicle width direction, and the side members are formed to extend in a front-rear direction of the vehicle. In