Battery pack

Abstract

To provide a battery pack that can prevent expansion of an upper cover, while avoiding a considerable increase in weight of a restraining band.SOLUTION: A battery pack 1 comprises: a battery stack 100; a lower case 200 that accommodates the battery stack; an upper cover 300 that covers the battery stack; a restraining band 400 that restrains the upper cover; a first fastening member 510 that fastens the upper cover to the lower case; and a second fastening member 520 that fastens the restraining band to the upper cover. The upper cover 300 has a top wall 310 provided above the battery stack, and the top wall 310 includes a pedestal 315 for fastening the second fastening member. The restraining band 400 has a top plate part 410 provided above the top wall, the top plate part 410 has a bead 412 extending in one direction, and the bead 412 has a coating part 413 coating the pedestal. The second fastening member 520 fastens the coating part 413 to the pedestal 315.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a battery pack. [Background technology]

[0002] For example, Japanese Patent Application Laid-Open No. 2019-197662 discloses an electricity storage device that includes an exterior body that houses multiple battery elements and a fixing band that is wrapped around the exterior body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-197662 Summary of the Invention [Problem to be solved by the invention]

[0004] In the energy storage device described in JP 2019-197662 A, in order to more reliably suppress expansion of the exterior body, it is necessary to increase the thickness of the fixing band, which increases the weight of the fixing band.

[0005] An object of the present disclosure is to provide a battery pack that can suppress expansion of the upper cover while avoiding a significant increase in the weight of the restraining band. [Means for solving the problem]

[0006] A battery pack according to one aspect of the present disclosure includes a battery stack including a plurality of storage cells arranged in one direction, a lower case that houses the battery stack, an upper cover that covers the battery stack, a restraint band that restrains the upper cover, a first fastening member that fastens the upper cover to the lower case, and a second fastening member that fastens the restraint band to the upper cover, wherein the upper cover has a top wall provided above the battery stack, the top wall including a base for fastening the second fastening member, the restraint band having a top plate portion provided above the top wall, the top plate portion having a bead extending in the one direction, the bead having a covering portion that covers the base, and the second fastening member fastens the covering portion to the base. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a battery pack that can suppress expansion of the upper cover while avoiding a significant increase in the weight of the restraining band. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a perspective view schematically illustrating the configuration of an upper cover and a restraining band of a battery pack according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a schematic cross-sectional view of a battery pack. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present disclosure will be described with reference to the accompanying drawings, in which the same or corresponding elements are designated by the same reference numerals.

[0010] Fig. 1 is a perspective view schematically showing the configuration of an upper cover and a restraining band of a battery pack according to an embodiment of the present disclosure. Fig. 2 is a schematic cross-sectional view of the battery pack. This battery pack 1 is mounted on, for example, a vehicle.

[0011] As shown in FIGS. 1 and 2, the battery pack 1 includes a battery stack 100, a lower case 200, an upper cover 300, a restraining band 400, a first fastening member 510, and a second fastening member 520.

[0012] The battery stack 100 includes a plurality of storage cells arranged in one direction (for example, the width direction of the vehicle). Each storage cell is, for example, a lithium-ion battery. Each storage cell is formed in a flat rectangular parallelepiped. The battery stack 100 may have a resin frame arranged between a pair of adjacent storage cells.

[0013] The lower case 200 houses the battery stack 100. The lower case 200 is open upward. The lower case 200 has a bottom wall 210, a peripheral wall 220, and a flange 230.

[0014] The bottom wall 210 supports the battery stack 100. The peripheral wall 220 stands upright from the peripheral edge of the bottom wall 210. A flange 230 projects outward from the upper end of the peripheral wall 220.

[0015] The upper cover 300 covers the battery stack 100. The upper cover 300 is open downward. The upper cover 300 has a top wall 310, a peripheral wall 320, and a flange 330.

[0016] The top wall 310 is disposed above the battery stack 100 and covers the battery stack 100. The peripheral wall 320 extends downward from the peripheral edge of the top wall 310. The flange 330 projects outward from the lower end of the peripheral wall 320.

[0017] As shown in Fig. 2, the top wall 310 has a thin portion 310a and a thick portion 310b that is thicker than the thin portion 310a. As shown in Fig. 1, each of the thin portion 310a and the thick portion 310b extends in a direction (e.g., the front-to-rear direction of the vehicle) perpendicular to both the one direction and the up-down direction. As shown in Figs. 1 and 2, the thin portions 310a and the thick portions 310b are arranged alternately in one direction.

[0018] The top wall 310 has a pedestal 315 for fastening the second fastening member 520. As shown in FIG. 2, the pedestal 315 is formed in a thick portion 310b. In this embodiment, the pedestal 315 has a pair of pedestal portions 315a provided at positions spaced apart from each other in one direction. Each pedestal portion 315a is formed in the thick portion 310b. A thin portion 310a is formed between the pair of thick portions 310b on which the pedestal portions 315a are formed.

[0019] Restraint band 400 restrains upper cover 300. Restraint band 400 has a function of suppressing deformation of upper cover 300 when pressure inside lower case 200 and upper cover 300 increases. In other words, restraint band 400 has a function of reinforcing upper cover 300. Restraint band 400 has a top plate portion 410, a pair of side walls 420, and a flange 430.

[0020] The top plate portion 410 is provided above the top wall 310. Each side wall 420 extends downward from an end of the top plate portion 410 in one direction. The flange 430 protrudes outward in one direction from the lower end of the side wall 420.

[0021] The top plate portion 410 has a bead 412 extending in one direction. The bead 412 has a covering portion 413 that covers the base 315.

[0022] The first fastening member 510 fastens the upper cover 300 to the lower case 200. As shown in Fig. 2, the first fastening member 510 fastens the flange 330 of the upper cover 300 to the flange 230 of the lower case 200. In this embodiment, the first fastening member 510 fastens the flange 430 of the restraint band 400 to the flange 230 of the lower case 200 together with the flange 330 of the upper cover 300.

[0023] The second fastening member 520 fastens the restraint band 400 to the upper cover 300. More specifically, the second fastening member 520 fastens the covering portion 413 to the base 315. As shown in FIG. 2, the second fastening member 520 is fastened in both one direction and the up and down directions. Parallel The first fastening member 510 is disposed in a plane including the first fastening member 510 (the plane shown in FIG. 2).

[0024] As described above, in the battery pack 1 of this embodiment, the top plate portion 410 of the restraint band 400 has the bead 412, and the covering portion 413 of the bead 412 is fastened to the base 315 by the second fastening member 520, which effectively improves the rigidity of the top wall 310 and the top plate portion 410. Therefore, it is possible to suppress the expansion of the upper cover 300 while avoiding a significant increase in the weight of the restraint band 400.

[0025] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0026] [Aspect 1] a battery stack including a plurality of storage cells arranged in one direction; a lower case that houses the battery stack; an upper cover that covers the battery stack; a restraining band that restrains the upper cover; a first fastening member that fastens the upper cover to the lower case; a second fastening member that fastens the restraint band to the upper cover, the upper cover has a top wall provided above the battery stack, the top wall includes a base for fastening the second fastening member, The restraining band is a top plate portion provided above the top wall, the top plate portion has a bead extending in the one direction, the bead has a covering portion that covers the base, The second fastening member fastens the covering portion to the base.

[0027] In this battery pack, the top plate of the restraint band has a bead, and the covering of the bead is fastened to the base with the second fastening member, which effectively improves the rigidity of the top wall of the upper cover and the top plate of the restraint band, thereby making it possible to suppress expansion of the upper cover while avoiding a significant increase in the weight of the restraint band.

[0028] [Aspect 2] The ceiling wall is A thin-walled portion; a thick portion having a thickness greater than that of the thin portion, 2. The battery pack according to claim 1, wherein the base is formed on the thick portion.

[0029] [Aspect 3] the base has a pair of base portions provided at positions spaced apart from each other in the one direction, 3. The battery pack according to claim 2, wherein the thin portion is formed between the pair of base portions.

[0030] In this embodiment, the weight of the top wall is reduced while the rigidity of the restraint band and the top wall is ensured.

[0031] [Aspect 4] The battery pack according to any one of aspects 1 to 3, wherein the second fastening member is provided in a plane that is perpendicular to both the one direction and the up-down direction and that includes the first fastening member.

[0032] It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present invention is defined by the claims rather than the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0033] 1 battery pack, 100 battery stack, 200 lower case, 210 bottom wall, 220 peripheral wall, 230 flange, 300 upper cover, 310 top wall, 310a thin portion, 310b thick portion, 315 base, 315a base portion, 320 peripheral wall, 330 flange, 400 restraining band, 410 top plate portion, 412 bead, 413 covering portion, 420 side wall, 430 flange, 510 first fastening member, 520 second fastening member.

Claims

1. a battery stack including a plurality of storage cells arranged in one direction; a lower case that houses the battery stack; an upper cover that covers the battery stack; a restraining band that restrains the upper cover; a first fastening member that fastens the upper cover to the lower case; a second fastening member that fastens the restraint band to the upper cover, the upper cover has a top wall provided above the battery stack, the top wall includes a base for fastening the second fastening member, The restraining band is a top plate portion provided above the top wall, the top plate portion has a bead extending in the one direction, the bead has a covering portion that covers the base, The second fastening member fastens the covering portion to the base.

2. The ceiling wall is A thin-walled portion; a thick portion having a thickness greater than that of the thin portion, The battery pack according to claim 1 , wherein the base is formed in the thick portion.

3. the base has a pair of base portions provided at positions spaced apart from each other in the one direction, The battery pack according to claim 2 , wherein the thin portion is formed between the pair of base portions.

4. The battery pack according to claim 1 , wherein the second fastening member is provided in a plane that is parallel to both the one direction and the up-down direction and that includes the first fastening member.

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