Battery pack case

Abstract

The utility model provides a battery pack shell, which is provided with a shell for accommodating a battery stack, the battery stack is formed by stacking a plurality of battery units, the shell is provided with an upper surface part, a lower surface part and a wall part arranged between the upper surface part and the lower surface part, and the upper surface part, the lower surface part and the wall part are integrally formed. As a result, it is possible to improve durability with respect to impacts and loads input from the outside.

Description

Technical Field

[0001] The utility model relates to a battery pack shell. Background Art

[0002] Patent Document 1 discloses a battery pack case including an upper case and a lower case that opens upward.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2023-055318

[0004] In the battery pack case disclosed in Patent Document 1, since the upper case and the lower case are formed of different members, there is a possibility that durability against external impact and load may be reduced. Utility Model Content

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a battery pack case capable of improving durability against impacts and loads input from the outside.

[0006] The battery pack housing of the present invention includes a housing for accommodating a battery stack formed by stacking a plurality of battery cells. The housing includes an upper portion, a lower portion, and a wall portion disposed between the upper portion and the lower portion. The upper portion, the lower portion, and the wall portion are integrally formed.

[0007] According to the present invention, the upper surface portion, the lower surface portion, and the wall portion are integrally formed, thereby improving durability against impacts and loads input from the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a plan view showing an example of the structure of a battery pack to which the battery pack case according to the embodiment is applied.

[0009] Figure 2 It is a plan view showing an example of the structure of a battery pack case according to the embodiment.

[0010] Figure 3 This is a side view showing an example of the structure of the battery pack case according to the embodiment, which is taken along Figure 2 The diagram when cut along line AA.

[0011] Figure 4 It is a side view showing an example of the structure of a general battery pack case. DETAILED DESCRIPTION

[0012] The battery pack case according to the embodiment of the present invention will be described with reference to the accompanying drawings. Components in the following embodiments include those that can be easily substituted by those skilled in the art or are substantially the same.

[0013] The battery pack case according to the embodiment is used as a case for a battery pack mounted on a vehicle, for example, such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), or a battery electric vehicle (BEV).

[0014] The battery pack 1 to which the battery pack case of the embodiment is applied is, for example, Figure 1 As shown, it includes a housing 11, a plurality of battery stacks 12, a bus bar 13 and an equipment box 14. Figures 1 to 3 , the longitudinal direction of the battery pack 1 is referred to as the “X direction”, the width direction of the battery pack 1 is referred to as the “Y direction”, and the height direction of the battery pack 1 is referred to as the “Z direction”.

[0015] The housing 11 is used to accommodate a plurality of battery stacks 12. The housing 11 is made of a casting such as an aluminum die casting. Figure 2 and Figure 3 As shown, it has an upper surface portion 111 , a lower surface portion 112 , a wall portion 113 , and side surfaces 114 , 115 .

[0016] The upper surface portion 111 corresponds to an upper cover of a typical battery pack case, and the lower surface portion 112 , the wall portion 113 , and the side surfaces 114 and 115 correspond to a lower case of a typical battery pack case.

[0017] The upper portion 111 is a portion constituting the upper portion of the housing 11. The lower portion 112 is a portion constituting the lower portion of the housing 11. Figure 1 and Figure 2 In the figure, for the convenience of explanation, the upper portion 111 of the housing 11 is omitted.

[0018] The wall portion 113 is disposed between the upper portion 111 and the lower portion 112. Figure 3 As shown, the wall portion 113 is used to form (partition) a space for housing multiple battery cells 121 (battery stack 12). Specifically, the wall portion 113 is disposed between the battery cells 121 arranged in the Y direction (width direction). The side portions 114 and 115 constitute the side surfaces of the housing 11.

[0019] In addition, the housing 11 is Figure 3As shown, the battery pack 1 has a shape with both sides open, allowing the battery cells 121 (battery stack 12) to be inserted into the housing 11 from the lateral direction (Y direction). The battery pack 1 is configured to protect the battery cells 121 by covering these openings with a cover member or the like, for example. Furthermore, since these openings do not bear the load, even if they are covered with a cover member, there is no problem in terms of strength.

[0020] like Figure 2 As shown, the battery stack 12 is formed by stacking a plurality of battery cells 121. The battery cells 121 are, for example, common lithium-ion secondary batteries. A restraining member 122 formed of a resin frame is interposed between the plurality of battery cells 121.

[0021] The busbars 13 are used to electrically connect the battery cells 121. The device box 14 carries various devices related to the battery.

[0022] Here, in a general battery pack housing, for example Figure 4 As shown, the upper cover 21 and the lower shell 22 are composed of different parts. Therefore, when an impact or load is input from the outside, stress (shear stress) is concentrated on the joint between the upper cover 21 and the lower shell 22 (see Figure 4 In conventional battery pack cases, stress concentration at the joints mentioned above is sometimes countered by the provision of ribs to increase strength. This increases quality and cost, and also creates design constraints.

[0023] Therefore, in the battery pack case of the embodiment, as Figure 2 and Figure 3 As shown, the upper surface portion 111, the lower surface portion 112, and the wall portion 113 are integrally formed. That is, in the housing 11, the upper surface portion 111, the lower surface portion 112, and the wall portion 113 are formed of the same member.

[0024] Thus, in the battery pack case according to the embodiment, by integrally forming the upper portion 111, lower portion 112, and wall portion 113, it is possible to improve durability against impacts and loads from all directions, including above, below, and from the sides. Furthermore, in the battery pack case according to the embodiment, since the load is distributed throughout the entire case 11, the resistance to external stress is improved. Furthermore, in the battery pack case according to the embodiment, there is no need to provide ribs or other methods to increase strength, thereby increasing design freedom.

[0025] According to the battery pack case according to the embodiment described above, by integrally forming the upper surface portion 111 , the lower surface portion 112 , and the wall portion 113 , it is possible to improve durability against external impacts and loads.

[0026] Furthermore, the battery pack case according to the embodiment has improved durability against impacts and load input from all directions, thereby improving protection of the battery cells 121 (battery stack 12). Furthermore, the battery pack case according to the embodiment can reduce the number of ribs used to increase strength, thereby increasing design freedom and reducing quality and cost.

[0027] In addition, in the battery pack case according to the embodiment, the number of parts can be reduced by integrating the upper surface 111, the lower surface 112 and the wall 113. In addition, in the battery pack case according to the embodiment, by opening both sides of the case 11 (see Figure 3 ), the design freedom of wiring, etc. is improved.

[0028] Those skilled in the art will readily derive further effects and variations. Therefore, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Therefore, various modifications may be made without departing from the general concept or scope of the present invention as defined by the technical solutions and their equivalents.

Claims

1. A battery pack housing, characterized in that: A housing for accommodating a battery stack, wherein the battery stack is formed by stacking a plurality of battery cells. The housing includes an upper surface portion, a lower surface portion, and a wall portion disposed between the upper surface portion and the lower surface portion, wherein the upper surface portion, the lower surface portion, and the wall portion are integrally formed.

Images