Battery pack fixing structure

Abstract

To obtain a battery pack fixing structure that can suppress the oscillation of the battery module while suppressing the occurrence of galvanic corrosion. [Solution] The battery pack fixing structure comprises a support member provided between adjacent battery modules in the vehicle's height direction and supporting the adjacent battery modules, among a plurality of battery modules enclosed in a cover made of carbon fiber reinforced material and installed on the vehicle's frame; a bracket that fixes the support member to the frame; a fastening member inserted into the bracket, cover, and support member with the cover positioned between the support member and the bracket, and connecting the bracket to the support member; and a cylindrical collar that penetrates the cover and is interposed between the support member and the bracket, with the support member and bracket in contact with the support member and bracket in a non-contact state with the cover, and through which the fastening member passes in the center, the surface of which is covered with a hard anodized layer.

Description

Technical Field

[0001] This disclosure relates to a fixing structure of a battery pack.

Background Art

[0002] Patent Document 1 discloses a structure in which a plurality of battery modules stacked on a vehicle body frame are housed in a case.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, if the upper part of a plurality of battery modules swings greatly, a load is applied to the joint part between the battery module and the frame, and the joint may be hindered. As a countermeasure, a method of providing a support member in the middle part of a plurality of battery modules, connecting a bracket to the support member, and further fixing the bracket to the frame can be considered. Thereby, the support member is supported by the frame, and the swing of the battery module can be reduced.

[0005] However, when a carbon fiber reinforced material (CFRP) is used for the material of the case of the battery module in such a configuration, since a support member or the like having a different material from the material of the case contacts the case, galvanic corrosion occurs in the support member or the like, and the mechanical strength of the support member or the like may decrease.

[0006] In consideration of the above facts, an object of this disclosure is to obtain a fixing structure of a battery pack that can suppress the swing of the battery module and the occurrence of galvanic corrosion.

Means for Solving the Problems

[0007] The battery pack fixing structure according to claim 1 of the present disclosure comprises: a support member provided between adjacent battery modules in the height direction of the vehicle and supporting the adjacent battery modules, among a plurality of battery modules enclosed in a cover made of carbon fiber reinforced material and installed on the frame of a vehicle; a bracket for fixing the support member to the frame; a fastening member inserted into the bracket, the cover and the support member with the cover positioned between the support member and the bracket, and connecting the bracket to the support member; and a cylindrical collar interposed between the support member and the bracket, penetrating the cover, with the support member and the bracket in contact with the support member and the bracket in a non-contact state with the cover, and through which the fastening member passes in the center, wherein the surface of the collar is covered with a hard anodized layer.

[0008] The battery pack fixing structure described in claim 1 suppresses the oscillation of the battery module, and by interposing a corrosion-resistant collar, galvanic corrosion can be suppressed by preventing direct contact between different materials such as the bracket and cover, and the support member and cover.

[0009] The battery pack fixing structure according to claim 2 of the present disclosure is characterized in that the surface of the hard anodized layer is covered with resin.

[0010] The battery pack fixing structure according to claim 2 of this disclosure protects the hard anodized layer with resin, thereby improving the insulation and durability of the hard anodized layer against vibration and suppressing the occurrence of galvanic corrosion over a long period of time.

[0011] The battery pack fixing structure according to claim 3 of the present disclosure is characterized in that an adhesive layer is provided between the bracket and the cover.

[0012] The battery pack fixing structure according to claim 3 of the present disclosure seals the gap between the bracket and the cover with an adhesive layer, thereby preventing water from entering the inside of the cover from the outside.

[0013] The battery pack fixing structure according to claim 4 of the present disclosure includes a bracket which is fixed to the support member while being located outside the cover and in contact with the collar, and a second member which connects the first member to the frame.

[0014] The battery pack fixing structure according to claim 4 of the present disclosure allows the support member to be fixed to the frame via a bracket composed of two members, thereby absorbing any misalignment when fixing the support member to the frame and securely fixing the support member to the frame.

[0015] The battery pack fixing structure according to claim 5 of the present disclosure is wherein the bracket is coated with cationic electrodeposition paint.

[0016] The battery pack fixing structure according to claim 5 of the present disclosure suppresses rust on the bracket and prevents the bracket material from coming into direct contact with the cover, thereby suppressing the occurrence of galvanic corrosion of the bracket. Furthermore, the adhesive strength of the adhesive layer is improved. [Effects of the Invention]

[0017] As explained above, the battery pack fixing structure according to this disclosure can suppress the oscillation of the battery module while suppressing the occurrence of galvanic corrosion. [Brief explanation of the drawing]

[0018] [Figure 1] Figure 1 is a perspective view of a battery pack 1 according to an embodiment of this disclosure. [Figure 2] Figure 2 is a perspective view of the support member 3. [Figure 3] Figure 3 is a perspective view of the bracket 4 connected to the support member 3 and the frame 10. [Figure 4] Figure 4 is a perspective view of the bracket 4 connected to the support member 3 and the frame 10. [Figure 5] Figure 5 shows an example of the configuration of the fixing structure 100 of the battery pack 1 according to the present disclosure.

Best Mode for Carrying Out the Invention

[0019] Hereinafter, referring to the drawings, the fixing structure of the battery pack will be described. In the following description, the front side in the longitudinal direction of the vehicle on which the battery pack is mounted, the rear side in the longitudinal direction of the vehicle, the upper side in the height direction of the vehicle, the lower side in the height direction of the vehicle, the right side in the left-right direction of the vehicle, and the left side in the left-right direction of the vehicle are respectively indicated by FR, RR, UPR, DWR, RH, and LH.

[0020] As shown in FIG. 1, the battery pack 1 may be fixed to a frame 10 (see FIGS. 3, 4, etc.) that constitutes, for example, the vicinity of the trunk of the vehicle, and may include a plurality of battery modules 1a stacked in the height direction of the vehicle and a cover 2 formed of a carbon fiber reinforced material (CFRP) that encloses the plurality of battery modules 1a.

[0021] Further, the battery pack 1 may include a support member 3 provided between battery modules 1a adjacent to each other in the height direction of the vehicle among the plurality of battery modules 1a and supporting the adjacent battery modules 1a. The support member 3 may be interpreted as a member for fixing the intermediate portion of the battery pack 1 in the height direction of the vehicle to the vehicle frame 10. A bracket 4 shown in FIGS. 3 and 4 is attached to the support member 3 and is fixed to the frame 10 via the bracket 4.

[0022] As shown in FIG. 2, the support member 3 may include a plate-like base portion 3a for fixing battery modules 1a adjacent to each other in the height direction of the vehicle and an extension portion 3b extending in the direction RR from the vicinity of the left and right ends of the base portion 3a. Further, the support member 3 may include two connection members 3c attached to the tip of the extension portion 3b and connecting the bracket 4.

[0023] The two connecting members 3c are arranged apart from each other in the left-right direction, and the connecting member 3c may have a connecting surface 3c1 on the side opposite to the extended portion 3b, to which the bracket 4 is connected. The connecting member 3c may have a plurality of through holes 3c2 that penetrate in the front-rear direction, for example.

[0024] As shown in Figure 3, the bracket 4 may include a first member 41 fixed to the connecting member 3c and a second member 42 connecting the first member 41 to the frame 10. The first member 41 and the second member 42 constituting the bracket 4 may be coated with cationic electrodeposition paint. This suppresses rust on the bracket 4 and prevents the material of the bracket 4 from coming into direct contact with the cover 2, thereby suppressing the occurrence of galvanic corrosion of the bracket 4. Furthermore, it improves the adhesive strength of the adhesive layer, which will be described later.

[0025] The first member 41 may be fixed to the connecting member 3c by, for example, four fastening members 5. The second member 42 may be fixed to the first member 41 by, for example, two fastening members 6, and may also be fixed to the frame 10 by, for example, two fastening members 7. The second member 42 may be interpreted as a member for absorbing the misalignment between the position of the first member 41 and the position of the bolt insertion holes formed in the frame 10. By fixing the support member 3 to the frame 10 via a bracket 4 composed of two members, the support member 3 can be securely fixed to the frame 10 while absorbing the misalignment when fixing the support member 3 to the frame 10.

[0026] Figure 5 shows a cross-sectional view of the support member 3 and the first member 41 in a vertical plane. The fixing structure 100 of the battery pack 1 may include a fastening member 5 and a collar 8 in addition to the support member 3 and the bracket 4.

[0027] The fastening member 5 may be inserted into the first member 41, cover 2, and connecting member 3c with the cover 2 positioned between the connecting member 3c and the first member 41, and fastened to the connecting member 3c. This fixes the first member 41 to the connecting member 3c. The fastening member 5 may also be fastened to the first member 41 via a watertight washer 5a. This seals the gap between the fastening member 5 and the first member 41, preventing water from entering through the gap.

[0028] The collar 8 can be interpreted as a cylindrical member that penetrates the cover 2 and is interposed between the connecting member 3c and the first member 41, and that contacts the connecting member 3c and the first member 41 while the connecting member 3c and the first member 41 are not in contact with the cover 2, with the fastening member 5 passing through its center. By providing the collar 8, it is possible to prevent the cover 2 from coming into contact with the connecting member 3c, prevent the cover 2 from coming into contact with the first member 41, and also prevent the male threaded portion of the fastening member 5 from coming into contact with the cover 2. The collar 8 may be press-fitted, for example, into a through hole formed in the cover 2.

[0029] In this way, the presence of color 8 between components (connecting member 3c, first member 41, etc.) made of a different material from the cover 2 can suppress the occurrence of galvanic reactions (so-called galvanic corrosion) caused by the potential difference that arises from the interposition of these components. Specifically, it can suppress the occurrence of galvanic corrosion between the CFRP cover 2 and the metal connecting member 3c, between the CFRP cover 2 and the metal first member 41, and further, between the CFRP cover 2 and the metal fastening member 5.

[0030] The surface of color 8 may be covered with a hard anodized layer. Furthermore, the surface of the hard anodized layer may be covered with resin. Because the hard anodized layer forms an artificial corrosion layer on the surface of color 8, the progression of galvanic corrosion between color 8 and components made of a different material than cover 2 can be suppressed. In addition, the protection of the hard anodized layer with resin improves the durability of the hard anodized layer against vibrations during vehicle operation, for example, and suppresses the occurrence of galvanic corrosion over a long period of time.

[0031] An adhesive layer 9 may be provided between the bracket 4 (first member 41) and the cover 2. The material constituting the adhesive layer 9 may be, for example, acrylic resin, epoxy resin, or urethane resin. As a result, the gap between the first member 41 and the cover 2 is sealed by the adhesive layer 9, thereby preventing water from entering the inside of the cover 2 from the outside.

[0032] The fixing structure 100 of this disclosure fixes the support member 3 of the battery pack 1 to the frame 10, thereby improving the rigidity of the entire battery module 1a stacked in multiple locations in the height direction, both in the front-to-back and left-to-right directions. Furthermore, since the battery pack 1, which can be considered as a single rigid body, is fixed to the frame 10, the rigidity of the frame 10 is also improved. In addition, the rigidity of the frame 10 can be further improved by providing the fixing structure 100 in multiple locations.

[0033] Furthermore, in the fixing structure 100 disclosed herein, fixing the battery pack 1 to the frame 10 on its rear side improves the rigidity of the frame 10 near the suspension tower, thereby preventing the suspension tower from tilting towards the center of the vehicle. Also, by fixing the battery pack 1 to the frame 10 on its rear side, even if another vehicle collides with the vehicle carrying the battery pack 1 from behind, the support member 3 will receive the load, thereby preventing the load from being applied to the battery module 1a and protecting the battery module 1a. [Explanation of Symbols]

[0034] 1 Battery pack 1a Battery Module 2 Covers 3. Support member 3a Base 3b Extension part 3c Connecting member 3c1 connection surface 3c2 through hole 4 brackets 5 Fastening members 5a Water-stopping washer 6 Fastening members 7 Fastening members 8 Colors 9 Adhesive layer 10 frames 41 First Member 42 Second Member 100 fixed structure

Claims

1. Among a plurality of battery modules enclosed in a cover made of carbon fiber reinforced material and installed on the vehicle frame, a support member is provided between adjacent battery modules in the height direction of the vehicle and supports the adjacent battery modules, A bracket for fixing the support member to the frame, The cover is inserted into the bracket, the cover, and the support member in a state where it is positioned between the support member and the bracket, and a fastening member connects the bracket to the support member, A cylindrical collar is interposed between the support member and the bracket, passing through the cover, and the support member and the bracket are in contact with the support member and the bracket in a state where they are not in contact with the cover, with the fastening member passing through its center. Equipped with, The aforementioned colored surface is covered with a hard anodized layer, forming a battery pack fixing structure.

2. The battery pack fixing structure according to claim 1, wherein the surface of the hard anodized layer is coated with resin.

3. The battery pack fixing structure according to claim 1, wherein an adhesive layer is provided between the bracket and the cover.

4. The battery pack fixing structure according to claim 1, wherein the bracket includes a first member that is located on the outside of the cover and fixed to the support member in contact with the collar, and a second member that connects the first member to the frame.

5. The battery pack fixing structure according to claim 4, wherein the bracket is coated with cationic electrodeposition paint.

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