Battery pack case

Abstract

The present invention provides a battery pack case having a case for housing a cell stack formed by stacking a plurality of battery cells, the case having an upper surface portion, a lower surface portion, and a wall portion disposed between the upper surface portion and the lower surface portion, the upper surface portion, the lower surface portion, and the wall portion being integrally configured. As a result, it is possible to improve durability with respect to impacts and loads input from the outside.

Description

Technical Field

[0001] The invention relates to a battery pack casing. 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 Publication 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, durability against impact and load input from the outside may be reduced. Summary of the invention

[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 has a housing for accommodating a battery stack formed by stacking a plurality of battery cells, the housing having an upper portion, a lower portion, and a wall portion arranged between the upper portion and the lower portion, the upper portion, the lower portion, and the wall portion being integrally formed.

[0007] According to the present invention, the upper surface portion, the lower surface portion, and the wall portion are integrally formed, so that the durability against the impact and load input from the outside can be improved. 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 1 is a side view showing an example of the structure of a battery pack case according to an embodiment, and is taken along Figure 2 The diagram when cutting along the AA line.

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

[0012] A battery pack case according to an embodiment of the present invention will be described with reference to the drawings. The components in the following embodiments include components that can be easily replaced by a person skilled in the art or are substantially the same.

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

[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 length 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 surface portions 114 , 115 .

[0016] The upper surface portion 111 corresponds to an upper cover of a general 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 general battery pack case.

[0017] The upper surface 111 is a portion constituting the upper surface of the housing 11. The lower surface 112 is a portion constituting the lower surface 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 113 is used to form (partition) a space for accommodating a plurality of battery cells 121 (battery stack 12). That is, the wall 113 is arranged between the battery cells 121 arranged in the Y direction (width direction). The side surfaces 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, and the battery cell 121 (battery stack 12) can be inserted into the housing 11 from the lateral direction (Y direction). The battery pack 1 is configured to protect the battery cell 121 by covering these openings with a cover member or the like, for example. In addition, since these openings do not share the load, there is no problem in terms of strength even if the openings are covered with a cover member.

[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 bus bar 13 is 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 in FIG. 1 , the upper cover 21 and the lower shell 22 are respectively 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 FIG. 1 ). Figure 4 In addition, in a general battery pack case, sometimes the stress concentration at the above-mentioned joint is assumed, and ribs are set to improve the strength. In this case, the quality and cost increase, and there are also design constraints.

[0023] Therefore, in the battery pack case of the embodiment, as Figure 2 and Figure 3 As shown in FIG. 1 , 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 forming the upper surface 111, the lower surface 112 and the wall 113 integrally, it is possible to improve the durability against impacts and loads from all directions, such as from the upper side, the side, and the lower side. In addition, in the battery pack case according to the embodiment, since the load is dispersed over the entire case 11, the strength against external stress is improved. In addition, in the battery pack case according to the embodiment, it is not necessary to set ribs or the like to improve the strength, so the degree of freedom in design is also improved.

[0025] According to the battery pack case according to the above-described embodiment, the upper surface portion 111 , the lower surface portion 112 , and the wall portion 113 are integrally formed, so that the durability against impact and load input from the outside can be improved.

[0026] In addition, in the battery pack case according to the embodiment, the durability against impact and load input from all directions is improved, thereby improving the protection performance of the battery cell 121 (battery stack 12). In addition, in the battery pack case according to the embodiment, ribs for improving strength can be reduced, thereby improving the design freedom and reducing the 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 can easily 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 changes may be made without departing from the general concept or scope of the invention defined by the technical solution and its 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, and the upper surface portion, the lower surface portion, and the wall portion are integrally formed.

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