Vehicle

Abstract

To reduce relative stress acting on a conduction member connected to a junction box in a structure where the junction box is fixed to a member different from a lower case.SOLUTION: A vehicle includes: a battery module on which a plurality of battery cells is laminated; a lower case which houses the battery module and to which the battery module is fixed; a junction box disposed above the battery module; a first body member to which the lower case is fixed; a second body member to which the junction box is fixed; and a conduction member electrically connecting the battery module and the junction box. The conduction member includes: a first connection part connected to the battery module; a second connection part connected to the junction box; and an intermediate part connecting the first connection part and the second connection part. The rigidity of the intermediate part is lower than the rigidity of the first connection part and also lower than the rigidity of the second connection part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a vehicle. [Background technology]

[0002] Patent Document 1 discloses a vehicle equipped with a battery pack. In the configuration described in Patent Document 1, the battery pack is disposed below a floor panel, and a battery module and a junction box are fixed to a lower case within the battery pack case. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6167096 Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration described in Patent Document 1, the battery module and the junction box are fixed to the same rigid body (the lower case), so there is a low risk of relative stress being applied to the conductive members that electrically connect the battery module and the junction box. In contrast, a structure in which the junction box is fixed to a member different from the lower case is conceivable. In this case, because the battery module and the junction box are fixed to different rigid bodies, there is a risk that excessive stress will act on the conductive members when the battery module and the junction box vibrate relative to each other.

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide a vehicle that can reduce the relative stress acting on conductive members connected to a junction box in a structure in which the junction box is fixed to a member different from the lower case. [Means for solving the problem]

[0006] The present invention comprises a battery module in which a plurality of battery cells are stacked, a lower case that houses the battery module and to which the battery module is fixed, a junction box arranged above the battery module, a first body member to which the lower case is fixed, a second body member to which the junction box is fixed, and a conductive member that electrically connects the battery module and the junction box, wherein the conductive member has a first connection portion connected to the battery module, a second connection portion connected to the junction box, and an intermediate portion that connects the first connection portion and the second connection portion, and the rigidity of the intermediate portion is lower than the rigidity of the first connection portion and also lower than the rigidity of the second connection portion. [Effects of the Invention]

[0007] According to the present invention, in a structure in which the junction box is fixed to a member different from the lower case, the relative stress acting on the conductive member connected to the junction box can be reduced. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram schematically illustrating a vehicle according to an embodiment. [Figure 2] 10A and 10B are diagrams illustrating a structure in which a battery module and a junction box are connected by a conductive member. [Figure 3] 10A and 10B are diagrams illustrating a structure in which a junction box and an interface are connected by a conductive member. [Figure 4] 10A and 10B are diagrams illustrating a structure in which the vibration absorbing section is made of a braided body. [Figure 5] 10A and 10B are diagrams for explaining a conductive member on the output side; [Figure 6] 10A and 10B are diagrams illustrating a structure in which a conductive member is configured by a bus bar. [Figure 7] 10A and 10B are diagrams illustrating a structure in which a vibration absorbing portion has slits. [Figure 8] 10A and 10B are diagrams illustrating a structure in which a vibration absorbing portion has a narrowed shape in the width direction. DETAILED DESCRIPTION OF THE INVENTION

[0009] A vehicle according to an embodiment of the present invention will be specifically described below, but the present invention is not limited to the embodiment described below.

[0010] FIG. 1 is a diagram illustrating a vehicle according to an embodiment. Vehicle 1 is an electric vehicle equipped with a battery pack. Vehicle 1 has a structure in which the battery pack is disposed below a floor panel. Vehicle 1 includes a battery module 2, a lower case 3, a junction box 4, a first body member 5, a second body member 6, and a conductive member 7.

[0011] The battery pack of the vehicle 1 has multiple battery modules 2, a lower case 3, and a junction box 4. The battery modules 2 are assembled batteries in which multiple battery cells are stacked. The lower case 3 houses the battery modules 2. The junction box 4 is disposed above the battery modules 2. The battery modules 2 and the junction box 4 are electrically connected by conductive members 7.

[0012] As shown in Figures 1 to 3, the lower case 3 is fixed to a first body member 5 and a second body member 6. The first body member 5 is a rocker provided on both widthwise sides of the vehicle 1 and extending in the longitudinal direction of the vehicle. The second body member 6 is a body member that constitutes the rear portion of the vehicle 1. For example, the second body member 6 is a metal member that is integrally molded by Gigacasting. The lower case 3 is bolted to the first body member 5 on both widthwise sides of the vehicle, and the rear portion in the longitudinal direction of the vehicle is bolted to the second body member 6.

[0013] The junction box 4 is fixed to the second body member 6 without using the lower case 3. The junction box 4 is fixed to the second body member 6 via a bracket 8. The bracket 8 is fixed to the second body member 6 via a support member 9. The support member 9 is fastened to the second body member 6 with bolts. As shown in Figures 2 and 3, at the rear of the vehicle 1, the support member 9 and the lower case 3 are fastened together to the second body member 6. The junction box 4 is covered by a cover member 10. The cover member 10 is fixed to the support member 9.

[0014] The junction box 4 is connected to a conductive member 11 on the output side. The junction box 4 and connection port 12 are electrically connected by the conductive member 11. The conductive member 11 is provided inside the battery pack case. The connection port 12 is provided on the outside of the lower case 3 and fixed to the lower case 3. A connector of an electrical device provided outside the lower case 3 is connected to the connection port 12. The junction box 4 outputs the power supplied from the battery module 2 to the electrical device connected to the connection port 12.

[0015] In the vehicle 1, the battery modules 2 and the junction box 4 are fixed to different rigid bodies. The battery modules 2 are fixed to the lower case 3, but the junction box 4 is not fixed to the lower case 3. When the vehicle 1 vibrates, the lower case 3 vibrates relative to the first body member 5 and the second body member 6. When the lower case 3 vibrates, the battery modules 2 and connection ports 12 fixed to the lower case 3 vibrate together with the lower case 3, but the junction box 4, which is not fixed to the lower case 3, vibrates relative to the lower case 3. Because the battery modules 2 and the junction box 4 are shaken by the vibration force of the vehicle 1 with different amplitudes, the conductive member 7 is constantly subjected to stress from relative displacement while the vehicle 1 is traveling. Therefore, the conductive member 7 has a vibration-absorbing structure that can withstand relative vibration.

[0016] 4, the conductive member 7 has a first connection portion 21 connected to the battery module 2, a second connection portion 22 connected to the junction box 4, and an intermediate portion 23 connecting the first connection portion 21 and the second connection portion 22. The intermediate portion 23 has a vibration absorbing structure.

[0017] The first connection portion 21 forms the lower portion of the conductive member 7. The first connection portion 21 is a bus bar that is connected to the terminal of the battery module 2. The first connection portion 21 includes a first horizontal portion that extends in the horizontal direction.

[0018] The second connection portion 22 forms an upper portion of the conductive member 7. The second connection portion 22 is a bus bar connected to an input terminal of the junction box 4. The second connection portion 22 includes a second horizontal portion extending in the horizontal direction.

[0019] The intermediate portion 23 is a portion of the conductive member 7 that extends in the vertical direction. The intermediate portion 23 has a first bent portion 31 bent from the first connecting portion 21, a second bent portion 32 bent from the second connecting portion 22, and a vibration absorbing portion 33 that connects the first bent portion 31 and the second bent portion 32.

[0020] The first bent portion 31 is bent upward in the up-down direction from the first connection portion 21. The first bent portion 31 is configured by a bus bar. The first connection portion 21 and the first bent portion 31 are integrally formed bus bars.

[0021] The second bent portion 32 is bent downward in the up-down direction from the second connecting portion 22. The second bent portion 32 is configured by a bus bar. The second connecting portion 22 and the second bent portion 32 are integrally formed bus bars.

[0022] The vibration absorbing section 33 extends in the vertical direction between the first bent section 31 and the second bent section 32. The vibration absorbing section 33 is made of braided wire. The vibration absorbing section 33 is a braided body of electric wire. The vibration absorbing section 33 is a flexible section that can actively displace in response to vibration. The vibration absorbing section 33 is flexible and absorbs relative vibration between rigid bodies. The vibration absorbing section 33 deforms to absorb relative movement when the battery module 2 and the junction box 4 vibrate relative to each other. The first bent section 31 and the second bent section 32 are bus bars, and the bus bars have high rigidity. The vibration absorbing section 33 is a flexible braided wire, and the rigidity of the braided wire is low. The rigidity of the vibration absorbing section 33 is lower than the rigidity of the first bent section 31 and lower than the rigidity of the second bent section 32. In other words, the rigidity of the vibration absorbing section 33 is lower than the rigidity of the first connecting section 21 and lower than the rigidity of the second connecting section 22.

[0023] The conductive member 7 has the vibration absorbing portion 33, which can reduce stress concentration on the first bent portion 31 and also reduce stress concentration on the second bent portion 32. The vibration absorbing portion 33 has flexibility against bending, which can ensure ease of assembly and fastening reliability of the conductive member 7.

[0024] Similar to the conductive member 7, the conductive member 11 on the output side also has a vibration absorbing structure that can withstand relative vibration. As shown in Fig. 5, the conductive member 11 has a first connection portion 41 connected to the junction box 4, a second connection portion 42 connected to the connection port 12, and an intermediate portion 43 that connects the first connection portion 41 and the second connection portion 42. The intermediate portion 43 has a vibration absorbing structure.

[0025] The first connection portion 41 forms an upper portion of the conductive member 11. The first connection portion 41 is a bus bar connected to an output terminal of the junction box 4. The first connection portion 41 includes a first horizontal portion extending in the horizontal direction.

[0026] The second connection portion 42 constitutes the lower part of the conductive member 11. The second connection portion 42 is a bus bar that is connected to the terminal of the connection port 12. The second connection portion 42 includes a second horizontal portion that extends in the horizontal direction.

[0027] The intermediate portion 43 constitutes a portion of the conductive member 11 that extends in the up-down direction. The intermediate portion 43 has a first bent portion 51 bent from the first connecting portion 41, a second bent portion 52 bent from the second connecting portion 42, and a vibration absorbing portion 53 that connects between the first bent portion 51 and the second bent portion 52.

[0028] The first bent portion 51 is bent downward in the up-down direction from the first connecting portion 41. The first bent portion 51 is configured by a bus bar. The first connecting portion 41 and the first bent portion 51 are integrally formed bus bars.

[0029] The second bent portion 52 is bent upward in the up-down direction from the second connecting portion 42. The second bent portion 52 is configured by a bus bar. The second connecting portion 42 and the second bent portion 52 are integrally formed bus bars.

[0030] The vibration absorbing portion 53 extends in the vertical direction between the first bent portion 51 and the second bent portion 52. The vibration absorbing portion 53 is made of braided wire. The vibration absorbing portion 53 is a braided body of electric wire. The vibration absorbing portion 53 is a flexible portion that can actively displace in response to vibration. The vibration absorbing portion 53 is flexible and absorbs relative vibration between rigid bodies. The vibration absorbing portion 53 deforms to absorb relative movement when the junction box 4 and the connection port 12 vibrate relative to each other. The first bent portion 51 and the second bent portion 52 are bus bars, and the bus bars have high rigidity. The vibration absorbing portion 53 is a flexible braided wire, and the rigidity of the braided wire is low. The rigidity of the vibration absorbing portion 53 is lower than the rigidity of the first bent portion 51 and lower than the rigidity of the second bent portion 52. In other words, the rigidity of the vibration absorbing portion 53 is lower than the rigidity of the first connecting portion 41 and lower than the rigidity of the second connecting portion 42.

[0031] The conductive member 11 has the vibration absorbing portion 53, which can reduce stress concentration on the first bent portion 51 and also reduce stress concentration on the second bent portion 52. The vibration absorbing portion 53 has flexibility against bending, which can ensure ease of assembly and fastening reliability of the conductive member 11.

[0032] As described above, according to the embodiment, the conductive members 7 and 11 have a vibration absorbing structure, which makes it possible to avoid stress concentration and improves resistance to repeated stress.

[0033] The vibration absorbing structure provided in the conductive member 7 and the conductive member 11 is not limited to a braided wire. For example, the conductive member 7 and the conductive member 11 may be entirely formed of a bus bar. As shown in FIG. 6 , the conductive member 7 has an intermediate portion 23 formed of a bus bar. The intermediate portion 23 has a first bent portion 31, a second bent portion 32, a first vertical portion 61, a first inclined portion 62, a second vertical portion 63, a second inclined portion 64, and a third vertical portion 65.

[0034] The first vertical portion 61 extends upward from the first bent portion 31 in the vertical direction. The first inclined portion 62 inclines from the first vertical portion 61 upward with respect to the vertical direction. The second vertical portion 63 extends upward from the first inclined portion 62 in the vertical direction. The second inclined portion 64 inclines from the second vertical portion 63 upward with respect to the vertical direction. The third vertical portion 65 extends upward from the second inclined portion 64 toward the second bent portion 32 in the vertical direction.

[0035] Furthermore, slits or constricted portions may be provided in the intermediate portion 23 as a structure for alleviating stress concentration. As shown in Fig. 7, the intermediate portion 23 has a slit 24 extending in the vertical direction. The slit 24 is provided across the first inclined portion 62, the second vertical portion 63, and the second inclined portion 64. As shown in Fig. 8, the intermediate portion 23 has a constricted portion 25 whose width is smallest in the central portion in the vertical direction. The modifications described with reference to Figs. 6 to 8 can also be applied to the conductive member 11. [Explanation of symbols]

[0036] 1 vehicle 2 Battery Module 3 Lower case 4 Junction Box 5. First body member 6 Second body member 7 Conductive materials

Claims

1. a battery module in which a plurality of battery cells are stacked; a lower case that houses the battery module and to which the battery module is fixed; a junction box disposed above the battery module; a first body member to which the lower case is fixed; a second body member to which the junction box is fixed; a conductive member that electrically connects the battery module and the junction box; Equipped with The conductive member is a first connection portion connected to the battery module; a second connection portion connected to the junction box; an intermediate portion connecting the first connection portion and the second connection portion, The rigidity of the intermediate portion is lower than the rigidity of the first connecting portion and lower than the rigidity of the second connecting portion. A vehicle characterized by:

2. the first connection portion includes a first horizontal portion extending horizontally, the second connection portion includes a second horizontal portion extending horizontally, The intermediate portion is a first bent portion bent upward from the first horizontal portion in the up-down direction; a second bent portion bent downward in the up-down direction from the second horizontal portion; a vibration absorbing portion extending in the up-down direction between the first bent portion and the second bent portion, The vibration absorbing portion deforms to absorb relative movement between the first connecting portion and the second connecting portion when the battery module and the junction box vibrate relative to each other.

2. The vehicle according to claim 1 .

3. the first horizontal portion and the first bent portion are configured by an integrally formed bus bar, the second horizontal portion and the second bent portion are configured by an integrally formed bus bar, The vibration absorbing portion is made of a braided wire.

3. The vehicle according to claim 2.

4. the conductive member is configured by a bus bar, The vibration absorbing portion is a first vertical portion extending upward from the first bent portion along the up-down direction; a first inclined portion inclined upward from the first vertical portion with respect to the up-down direction; a second vertical portion extending upward from the first inclined portion along the vertical direction; a second inclined portion inclined upward from the second vertical portion with respect to the up-down direction; a third vertical portion extending in the up-down direction from the second inclined portion toward the second bent portion; 3. The vehicle according to claim 2.

5. The first inclined portion, the second vertical portion, and the second inclined portion are provided with slits extending in the up-down direction.

5. The vehicle according to claim 4.

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