Battery pack

Abstract

The utility model relates to a battery pack. The sealing property of a housing including a structure in which wall members are joined to each other is ensured. The battery pack is provided with a cuboid-shaped housing that accommodates a battery module and a plate-shaped sealing member that covers a corner portion of the housing, the housing has a side wall portion, an upper wall portion, and a bottom wall portion, the sealing member has a side plate portion, an upper plate portion, and a lower plate portion, the side plate portion, the upper plate portion, and the lower plate portion are adhered to the housing by an adhesive arranged at a peripheral portion of the sealing member, in the upper plate portion, a first portion that faces a corner portion of the upper wall portion is formed to have a rigidity lower than a second portion other than the first portion, and the second portion is fastened and connected to the upper wall portion, in the lower plate portion, a third portion that faces a corner portion of the bottom wall portion is formed to have a rigidity lower than a fourth portion other than the third portion, and the fourth portion is fastened and connected to the bottom wall portion.

Description

Technical Field

[0001] This utility model relates to battery packs. Background Technology

[0002] Patent document 1 discloses a sealing structure for a battery pack, which uses a sealing member inside the housing to seal between the lower housing and the upper housing.

[0003] [Existing Technical Documents]

[0004] [Patent Literature]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2022-165831 Utility Model Content

[0006] The problem to be solved by the utility model

[0007] In a battery pack housing, where the side wall has a structure formed by joining multiple wall members, in order to prevent water from entering the housing from the outside, it is considered to cover and seal the part where the wall members are joined together with an adhesive or the like, but there is room for improvement in terms of sealing performance.

[0008] This invention was made in view of the above circumstances, and its object is to provide a battery pack that can ensure sealing for a housing including a structure in which wall members are joined to each other.

[0009] Methods for solving problems

[0010] The present invention is characterized in that the battery pack comprises: a rectangular shell housing housing a battery module formed by stacking multiple battery cells; and a plate-shaped sealing member fixed to the shell housing to cover the corners of the shell housing and seal the shell housing. The shell housing has: a side wall portion disposed opposite to the side of the battery module and including a joint portion formed by joining a first wall member and a second wall member; an upper wall portion disposed opposite to the upper surface of the battery module and fixed to the side wall portion; and a bottom wall portion disposed opposite to the lower surface of the battery module and fixed to the side wall portion. The sealing member has: a side plate portion fixed to the side wall portion to cover the edge between adjacent surfaces of the side of the shell housing and the joint portion; and an upper plate portion. A sealing member is integrally formed with the side plate portion and fixed to the upper wall portion in such a way as to cover the corner of the upper wall portion. A sealing member is integrally formed with the side plate portion and fixed to the bottom wall portion in such a way as to cover the corner of the bottom wall portion. The side plate portion, the upper plate portion, and the lower plate portion are bonded to the housing by an adhesive continuously arranged in annular shape on the periphery of the sealing member. In the upper plate portion, a first portion facing the corner of the upper wall portion is formed with a lower rigidity than a second portion other than the first portion, and the second portion is fastened to the upper wall portion. In the lower plate portion, a third portion facing the corner of the bottom wall portion is formed with a lower rigidity than a fourth portion other than the third portion, and the fourth portion is fastened to the bottom wall portion.

[0011] Utility Model Effect

[0012] In this invention, a tight seal can be ensured for a housing consisting of wall members joined together. Attached Figure Description

[0013] Figure 1 This is a schematic diagram illustrating the battery pack in the embodiment.

[0014] Figure 2 This diagram shows a state where sealing components are fixed at the corners of the casing.

[0015] Figure 3 This diagram illustrates the state of the device before the sealing components are installed.

[0016] Figure 4 It is a schematic diagram showing the shape of the sealing component before installation.

[0017] Figure 5 This is a diagram used to illustrate the construction of a sealing component.

[0018] Figure 6 This is a diagram used to illustrate the deformation of a sealing component.

[0019] Figure 7 It is a diagram used to illustrate the shape of the sealing component.

[0020] Figure 8 This is a diagram used to illustrate the process of fixing the sealing components. Detailed Implementation

[0021] The battery pack in the embodiments of this utility model will be described in detail below. However, this utility model is not limited to the embodiments described below.

[0022] Figure 1 This is a schematic diagram illustrating the battery pack in the embodiment. The battery pack 1 includes multiple battery modules, a housing 10, and a sealing member 20. The battery pack 1 is mounted in a vehicle. The vehicle operates using the electricity stored in the battery pack 1. Furthermore, in Figure 1 The diagram of the battery module has been omitted.

[0023] The housing 10 is a cuboid-shaped housing that houses a battery module composed of multiple stacked battery cells. The housing 10 can accommodate multiple battery modules. The housing 10 is a battery pack housing mounted on the vehicle body. Sealing members 20 are installed at the four corners of the housing 10. The housing 10 has side walls 11, an upper wall 12, and a bottom wall.

[0024] The side wall portion 11 is a wall portion disposed opposite to the side of the battery module. The side wall portion 11 forms a quadrilateral frame formed to surround the perimeter of the battery module. The side wall portion 11 includes a joint portion 13 formed by joining a first wall member 11A and a second wall member 11B. The joint portion 13 is the portion where the first wall member 11A and the second wall member 11B are joined when one end of the first wall member 11A abuts against the second wall member 11B. The first wall member 11A forms a first side surface. The second wall member 11B forms a second side surface adjacent to the first side surface. The first wall member 11A and the second wall member 11B form adjacent surfaces separated by an edge 14. Furthermore, in the description, the first wall member 11A and the second wall member 11B are referred to as the side wall portion 11 without special distinction.

[0025] The upper wall portion 12 is a wall portion disposed opposite to the upper surface of the battery module. The upper wall portion 12 is composed of a quadrilateral wall member fixed to the upper part of the side wall portion 11. The bottom wall portion is a wall portion disposed opposite to the lower surface of the battery module. The bottom wall portion is composed of a quadrilateral wall member fixed to the lower part of the side wall portion 11.

[0026] The sealing member 20 is fixed to the housing 10 by covering the corners of the housing 10. The sealing member 20 is a plate-shaped component that seals the corners of the housing 10. The sealing member 20 is made of an elastic material or a heat-shrinkable material. For example, the sealing member 20 is made of aluminum. The sealing members 20 are respectively bonded and fastened to the four corners of the housing 10.

[0027] like Figures 2-4 As shown, the sealing member 20 has a side plate portion 21, an upper plate portion 22, and a lower plate portion 23.

[0028] Side panel 21 is a plate member that covers the corner of side wall 11. For example... Figure 1 , Figure 4 As shown, the side plate portion 21 is fixed to the side wall portion 11 in such a way that it covers the joint portion 13 and the edge 14 in the side surface of the housing 10. The edge 14 is the edge between adjacent surfaces in the side surface of the housing 10. The first side surface, which is mainly composed of the first wall member 11A, and the second side surface, which is mainly composed of the second wall member 11B, are adjacent to each other across the edge 14. The side plate portion 21 includes: a curved portion 21a, which is bent at approximately a right angle to cooperate with the adjacent side surface and the edge 14; and two flat plate portions 21b, which are connected by means of the curved portion 21a. One flat plate portion 21b and the other flat plate portion 21b are continuously formed via the curved portion 21a. The curved portion 21a is bent at an obtuse angle before being fixed to the housing 10, and bent at a right angle when fixed to the housing 10.

[0029] The upper plate portion 22 is integrally formed with the side plate portion 21 and is fixed to the plate portion of the upper wall portion 12 in such a way as to cover the corner of the upper wall portion 12. The upper plate portion 22 includes a first portion 22a and a second portion 22b. The upper plate portion 22 has a shape in which a pair of second portions 22b are connected via the first portion 22a.

[0030] Part 1, 22a, is the portion opposite to the corner of the upper wall portion 12. Part 2, 22b, is the portion securely connected to the upper wall portion 12 and is formed in a flat plate shape. Part 1, 22a, is formed to have lower rigidity than Part 2, 22b. Part 1, 22a, is capable of elastic deformation by flexing when Part 2, 22b, is folded. The upper plate portion 22 and the side plate portion 21 are continuously formed via a bend. Part 1, 22a, of the upper plate portion 22 is connected to the bend 21a of the side plate portion 21. Part 2, 22b, of the upper plate portion 22 is continuously formed to the upper end of the flat plate portion 21b of the side plate portion 21 via a bend. The second part 22b of one side is connected to the upper end of the flat plate portion 21b of the other side via a bend. The second part 22b of the other side is connected to the upper end of the flat plate portion 21b of the other side via a bend. Figures 3-8 As shown, before the sealing member 20 is installed on the housing 10, the upper plate portion 22 is bent from the side plate portion 21, but is not bent at a right angle relative to the side plate portion 21.

[0031] like Figure 5 As shown, if a load is applied to the upper plate 22 by pressing the second part 22b downward from the inclined state of the second part 22b relative to the flat plate 21b of the side plate 21, then the first part 22a will elastically deform by flexing, as shown. Figure 6 As shown, the flat plate portions 21b of the side plate portion 21 are deformed at right angles to each other. In the upper plate portion 22, the first portion 22a, facing the corner of the upper wall portion 12, is formed to have a lower rigidity than the second portion 22b, excluding this first portion 22a. For example... Figure 8 As shown, the second part 22b is fastened to the upper wall portion 12 by a fastening connecting member 40. The second part 22b is provided with a through hole 22c through which the fastening connecting member 40 is inserted. Furthermore, when the second part 22b is folded, the first part 22a elastically deforms in a state where it faces the corner of the upper wall portion 12. At this time, as... Figure 5 As shown, the elastic deformation of the first part 22a prevents interference between the second part 22b of one party and the second part 22b of the other party. Figure 2 As shown, with the upper plate portion 22 fixed to the upper wall portion 12, the upper plate portion 22 extends in a direction orthogonal to the side plate portion 21, forming a shape parallel to the upper wall portion 12.

[0032] The lower plate portion 23 has a shape that reverses the shape of the upper plate portion 22 relative to the side plate portion 21. The lower plate portion 23 is integrally formed with the side plate portion 21 and is fixed to the bottom wall portion by covering the corner of the bottom wall portion. The lower plate portion 23 includes a third part 23a and a fourth part 23b. (As...) Figure 4 As shown, the third portion 23a of the lower plate portion 23 is formed with the same shape as the first portion 22a of the upper plate portion 22, and the fourth portion 23b of the lower plate portion 23 is formed with the same shape as the second portion 22b of the upper plate portion 22. The lower plate portion 23 has a shape in which a pair of fourth portions 23b are connected via the third portion 23a.

[0033] Part 3, 23a, is the portion facing the corner of the bottom wall portion. Part 4, 23b, is the portion securely connected to the bottom wall portion and is formed into a flat plate shape. Part 3, 23a, is formed to have lower rigidity than Part 4, 23b. Part 3, 23a, can elastically deform by flexing when Part 4, 23b, is folded. The lower plate portion 23 and the side plate portion 21 are continuously formed via a bend. The third portion 23a of the lower plate portion 23 is connected to the bend 21a of the side plate portion 21. The fourth portion 23b of the lower plate portion 23 is continuously formed to the lower end of the flat plate portion 21b of the side plate portion 21 via a bend. One side's fourth portion 23b is connected to the lower end of one side's flat plate portion 21b via a bend. The other side's fourth portion 23b is connected to the lower end of the other side's flat plate portion 21b via a bend. Figure 3 , Figure 4 As shown, before the sealing member 20 is installed on the housing 10, the lower plate portion 23 is bent from the side plate portion 21, but is not bent at a right angle relative to the side plate portion 21.

[0034] If a load is applied to the lower plate 23 by pressing the fourth portion 23b upwards from a state where it is inclined relative to the flat plate portion 21b of the side plate 21, the third portion 23a will elastically deform by flexing, and the flat plate portions 21b of the side plate 21 will deform by bending at right angles to each other. In the lower plate 23, the third portion 23a, which faces the corner of the bottom wall, is formed to have a lower rigidity than the fourth portion 23b, excluding the third portion 23a. The fourth portion 23b is fastened to the bottom wall by a fastening connecting member. Figure 4 As shown, a through hole 23c for inserting a fastening connecting member is provided in the fourth part 23b. Furthermore, when the fourth part 23b is folded, the third part 23a elastically deforms in a state where it faces the corner of the bottom wall. At this time, the elastic deformation of the third part 23a prevents interference between one fourth part 23b and the other. With the lower plate 23 fixed to the bottom wall, the lower plate 23 extends in a direction orthogonal to the side plate 21, forming a shape parallel to the bottom wall.

[0035] In the sealing member 20, by applying a load in a manner that clamps the second part 22b of the upper plate 22 and the fourth part 23b of the lower plate 23 in the vertical direction, the first part 22a of the upper plate 22, the third part 23a of the lower plate 23 and the curved part 21a of the side plate 21 are elastically deformed, and can be elastically deformed into a right-angled shape.

[0036] like Figure 4 As shown, the side plate portion 21, the upper plate portion 22, and the lower plate portion 23 are bonded to the housing 10 by an adhesive 30 continuously arranged in an annular shape around the periphery of the sealing member 20. The adhesive 30 is provided in the area covering the joint portion 13 and the edge 14. The sealing member 20 can be sealed by the adhesive 30 in a state that covers the corner of the side wall portion 11 including the joint portion 13 and the edge 14.

[0037] As explained above, according to the embodiment, by fastening the sealing member 20 to cover the joint 13 from the outside of the housing 10, damage to the joint 13 caused by external loads and vibrations from the housing 10 can be suppressed, and water can be prevented from adhering to the joint 13, thus ensuring a tight seal. Furthermore, because the first portion 22a, which faces the corner of the upper wall portion 12, has relatively low rigidity, interference of the upper plate portion 22 can be suppressed during the fastening of the sealing member 20, thus suppressing a decrease in the sealing performance in the upper part of the housing 10. Similarly, because the third portion 23a, which faces the corner of the lower wall portion, has relatively low rigidity, interference of the lower plate portion 23 can be suppressed during the fastening of the sealing member 20, thus suppressing a decrease in the sealing performance in the lower part of the housing 10.

[0038] Explanation of reference numerals in the attached figures

[0039] 1 Battery Pack

[0040] 10. Shell

[0041] 11. Side wall portion

[0042] 12 Upper wall

[0043] 13 Joint

[0044] 14 sides

[0045] 20 Sealing components

[0046] 21 Side panel section

[0047] 22 Upper plate part

[0048] 22a Part 1

[0049] 22b Part 2

[0050] 23 Lower plate section

[0051] 23a Part 3

[0052] 23b Part 4

Claims

1. A battery pack, characterized in that, have: A rectangular casing houses a battery module composed of multiple stacked battery cells; and A plate-shaped sealing member is fixed to the housing in such a way as to cover the corners of the housing, and seals the housing. The housing has: The sidewall portion is disposed opposite to the side of the battery module and includes a joint portion formed by the first wall member and the second wall member. The upper wall portion is disposed opposite to the upper surface of the battery module and is fixed to the side wall portion; as well as The bottom wall portion is disposed opposite to the lower surface of the battery module and is fixed to the side wall portion. The sealing member has: The side plate portion is fixed to the side wall portion in such a way as to cover the edge between adjacent surfaces on the side of the housing and the joint portion; The upper plate is integrally formed with the side plate and is fixed to the upper wall portion by covering the corner of the upper wall portion. The lower plate is integrally formed with the side plate portion and is fixed to the bottom wall portion by covering the corner of the bottom wall portion. The side plate portion, the upper plate portion, and the lower plate portion are bonded to the housing by an adhesive continuously arranged in a ring shape around the periphery of the sealing member. In the upper plate portion, a first portion facing the corner of the upper wall portion is formed to have a lower rigidity than a second portion other than the first portion, and the second portion is securely connected to the upper wall portion. In the lower plate portion, the third portion, which faces the corner of the bottom wall portion, is formed to have a lower rigidity than the fourth portion other than the third portion, and the fourth portion is fastened to the bottom wall portion.

Images