Vehicle lower part structure

Abstract

To provide a vehicle lower part structure capable of: suppressing contact with a cable, of gas discharged from a pressure release valve; and suppressing damage to the cable caused by the contact.SOLUTION: A vehicle lower part structure includes: a power storage device 200 including at least one power storage stack 210, a case that accommodates the at least one power storage stack 210, and a pressure release valve 230 provided on an upper surface of the case; a cable 300 provided above the power storage device 200; and a cover 400 provided between the pressure release valve 230 and the cable 300.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] For example, JP 2022-516519 A discloses a power battery pack including a plurality of cells, a battery tray for accommodating the cells, and a cover plate connected to the battery tray. A battery pack explosion-proof valve is attached to the side wall of the battery tray and is attached to an exhaust hole. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2022-516519 Summary of the Invention [Problem to be solved by the invention]

[0004] In the power battery pack described in JP 2022-516519 A, a cable may be provided near the battery pack explosion-proof valve. In this case, there is a concern that gas discharged from the battery pack explosion-proof valve may come into contact with the cable and damage the cable.

[0005] An object of the present disclosure is to provide a vehicle undercarriage structure that can suppress contact of gas discharged from a pressure relief valve with a cable and the resulting damage to the cable. [Means for solving the problem]

[0006] A vehicle undercarriage according to one aspect of the present disclosure includes an energy storage device including at least one energy storage stack, a case that houses the at least one energy storage stack, and a pressure release valve provided on an upper surface of the case, a cable provided above the energy storage device, and a cover provided between the pressure release valve and the cable. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a vehicle undercarriage structure that can prevent gas discharged from a pressure release valve from coming into contact with a cable and the resulting damage to the cable. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram illustrating a vehicle including a vehicle undercarriage according to an embodiment of the present disclosure. [Figure 2] FIG. 1 is a perspective view schematically illustrating a power storage device. [Figure 3] FIG. 2 is a perspective view schematically illustrating the vehicle undercarriage as viewed from below. [Figure 4] 1 is a cross-sectional view schematically showing a vehicle undercarriage. [Figure 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present disclosure will be described with reference to the accompanying drawings, in which the same or corresponding elements are designated by the same reference numerals.

[0010] As shown in FIGS. 1 to 5, a vehicle 1 including a vehicle undercarriage includes a vehicle body 100, a power storage device 200, a cable 300, and a cover 400.

[0011] The vehicle body 100 has a mounting portion 110 and a recess 120 .

[0012] Mounting section 110 is a portion where power storage device 200 is mounted. Mounting section 110 is configured as a lower portion of vehicle body 100.

[0013] The recess 120 has a recessed shape that protrudes upward from the mounting portion 110. The recess 120 extends in the front-rear direction of the vehicle. The recess 120 may be formed in the center in the width direction of the vehicle.

[0014] The power storage device 200 is mounted to a mounting portion 110 of the vehicle body 100. The power storage device 200 has at least one power storage stack 210, a case 220, a pressure release valve 230, and a breathing membrane 240.

[0015] At least one power storage stack 210 has a plurality of (for example, four) power storage stacks 210. Each power storage stack 210 includes a plurality of power storage cells 211 (see FIG. 4). The plurality of power storage cells 211 are arranged, for example, to be aligned along the front-rear direction of the vehicle. However, the plurality of power storage cells 211 may also be arranged to be aligned along the width direction of the vehicle.

[0016] Each storage cell 211 is formed in a flat rectangular parallelepiped shape. An example of each storage cell 211 is a lithium ion battery. Each storage cell 211 may be configured as an all-solid-state battery using a solid electrolyte. Each storage cell 211 may include a safety valve provided at a position facing the upper cover 224, i.e., on the top surface of the housing of the storage cell 211.

[0017] The case 220 houses a plurality of power storage stacks 210. The case 220 may also house a junction box, etc. The case 220 has a lower case 222 and an upper cover 224.

[0018] The lower case 222 is open upward and has a bottom wall 222a and a peripheral wall 222b.

[0019] The bottom wall 222a supports each of the power storage stacks 210.

[0020] The peripheral wall 222b stands upright from the peripheral edge of the bottom wall 222a. The peripheral wall 222b surrounds the periphery of the multiple power storage stacks 210. The peripheral wall 222b is formed in a substantially rectangular cylindrical shape. A positive electrode connector 251 and a negative electrode connector 252 are provided on the side surfaces of the peripheral wall 222b.

[0021] Upper cover 224, together with lower case 222, houses multiple power storage stacks 210. The peripheral edge of upper cover 224 is fixed to the upper end of peripheral wall 222b with bolts or the like. Upper cover 224 has an upper surface 224a.

[0022] The pressure release valve 230 is provided on the upper surface 224a of the case 220. The pressure release valve 230 releases the pressure inside the case 220. The pressure release valve 230 opens when the pressure inside the case 220 reaches or exceeds a reference value. The pressure release valve 230 is configured as a check valve.

[0023] The breathing membrane 240 is provided on a side surface of the case 220, i.e., on the peripheral wall 222b. Specifically, a through-hole is provided in the peripheral wall 222b, and the breathing membrane 240 is attached to the peripheral wall 222b so as to cover the through-hole. The breathing membrane 240 adjusts the pressure inside the case 220 by allowing gas to pass between the inside and outside of the case 220. As shown in FIG. 4, the breathing membrane 240 is provided on the side surface of the peripheral wall 222b that is on the front side of the vehicle. The breathing membrane 240 is arranged between the positive electrode connector 251 and the negative electrode connector 252.

[0024] The cable 300 is provided above the power storage device 200. The cable 300 connects devices including the power storage cells 211 to each other. The cable 300 includes a high-voltage cable 310. The cable 300 is arranged (routed) in the recess 120 of the vehicle body 100.

[0025] The cover 400 is provided between the power storage device 200 and the cable 300. The cover 400 is made of metal or the like. The cover 400 has an interposing portion 410 and a restricting portion 420.

[0026] The interposed portion 410 is interposed between the pressure release valve 230 and the cable 300. The interposed portion 410 is disposed in the recess 120. The interposed portion 410 may be formed in a flat plate shape. The interposed portion 410 supports the cable 300. As shown in FIG. 3 , the interposed portion 410 may be formed with an exposure opening 410h that exposes a portion of the cable 300 downward.

[0027] 4, the interposed portion 410 has an intermediate portion 412 located between a portion located above the pressure release valve 230 and a portion located above the breathing membrane 240. The intermediate portion 412 overlaps with the upper surface 224a of the upper cover 224 in the vertical direction.

[0028] The restricting portion 420 restricts the gas discharged from the pressure release valve 230 from flowing toward the breathing membrane 240. As shown in Fig. 4, the restricting portion 420 has a shape that extends downward from the middle portion 412. As shown in Fig. 5, the length W1 of the restricting portion 420 in the width direction of the vehicle is greater than the length W2 between the outer ends of the positive electrode connector 251 and the negative electrode connector 252 in the width direction of the vehicle.

[0029] As described above, in the vehicle undercarriage structure of this embodiment, the cover 400 is provided between the pressure release valve 230 and the cable 300, thereby preventing the gas discharged from the pressure release valve 230 from coming into contact with the cable 300 and resulting damage to the cable 300.

[0030] Furthermore, since the length W1 is greater than the length W2, the gas discharged from the pressure release valve 230 is prevented from coming into contact with the connectors 251 and 252.

[0031] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0032] [Aspect 1] an electricity storage device including at least one electricity storage stack, a case that houses the at least one electricity storage stack, and a pressure release valve that is provided on an upper surface of the case; a cable provided above the power storage device; and a cover provided between the pressure release valve and the cable.

[0033] In this vehicle undercarriage structure, a cover is provided between the pressure release valve and the cable, which prevents the gas discharged from the pressure release valve from coming into contact with the cable and the resulting damage to the cable.

[0034] [Aspect 2] The power storage device further includes a breathing membrane provided on a side surface of the case, The cover is an interposition portion interposed between the pressure release valve and the cable; a restricting portion that restricts gas discharged from the pressure release valve from flowing toward the breathing membrane.

[0035] In this embodiment, contact of the gas discharged from the pressure relief valve with the breathing membrane and resulting damage to the breathing membrane are suppressed.

[0036] [Aspect 3] the interposed portion has an intermediate portion located between a portion located above the pressure release valve and a portion located above the breathing membrane, Aspect 3. The vehicle undercarriage structure according to aspect 2, wherein the restricting portion has a shape that extends downward from the intermediate portion.

[0037] In this embodiment, the restriction effectively blocks gas from the pressure relief valve to the breathing membrane.

[0038] [Aspect 4] Further comprising a vehicle body, the power storage device is attached to a lower part of the vehicle body, The vehicle body includes: a mounting portion to which the power storage device is mounted; a recess having a shape that is recessed so as to be convex upward from the mounting portion, Aspect 4. The vehicle undercarriage structure according to aspect 2 or 3, wherein the cable and the interposition portion are disposed in the recess.

[0039] [Aspect 5] Aspect 5. The vehicle undercarriage of any of aspects 1 to 4, wherein the cable comprises a high voltage cable.

[0040] It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present invention is defined by the claims rather than the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0041] 1 vehicle, 100 vehicle body, 110 mounting portion, 120 recess, 200 energy storage device, 210 energy storage stack, 211 energy storage cell, 220 case, 222 lower case, 222b peripheral wall, 224 upper cover, 224a top surface, 230 pressure release valve, 240 breathing membrane, 251 positive electrode connector, 252 negative electrode connector, 300 cable, 310 high voltage cable, 400 cover, 410 interposition portion, 412 intermediate portion, 420 regulating portion.

Claims

1. an electricity storage device including at least one electricity storage stack, a case that houses the at least one electricity storage stack, and a pressure release valve that is provided on an upper surface of the case; a cable provided above the power storage device; and a cover provided between the pressure release valve and the cable.

2. The power storage device further includes a breathing membrane provided on a side surface of the case, The cover is an interposition portion interposed between the pressure release valve and the cable; 2. The vehicle underbody structure according to claim 1, further comprising: a restricting portion that restricts gas discharged from the pressure release valve from flowing toward the breathing membrane.

3. the interposed portion has an intermediate portion located between a portion located above the pressure release valve and a portion located above the breathing membrane, The vehicle underbody structure according to claim 2 , wherein the restriction portion has a shape extending downward from the intermediate portion.

4. Further comprising a vehicle body, the power storage device is attached to a lower part of the vehicle body, The vehicle body includes: a mounting portion to which the power storage device is mounted; a recess having a shape that is recessed so as to be convex upward from the mounting portion, The vehicle underbody structure according to claim 2 or 3, wherein the cable and the interposition portion are disposed in the recess.

5. The vehicle undercarriage of claim 1 , wherein the cable comprises a high voltage cable.

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