Storage case

Abstract

To reduce the impact of road interference on a battery pack inside a housing case.SOLUTION: In a housing case for a battery pack mounted on a vehicle, with a bottom plate arranged on the bottom surface, the bottom plate includes a bottom plate main body portion that includes a bottom plate recess having a rectangular wave-shaped cross section perpendicular to the front-rear direction of the vehicle, and protruding downward from the vehicle, and a bottom plate convex protruding upward from the vehicle, and a plurality of first reinforcing members arranged in the bottom plate recess and extending in the front-rear direction of the vehicle, in which the first reinforcing members are plate-shaped members having a hat-shaped cross section perpendicular to the front-rear direction of the vehicle, and a cylinder portion is arranged in contact with the bottom plate recess.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a housing case for a battery pack.

Background Art

[0002] In recent years, the development of electric vehicles equipped with high-capacity battery packs has been underway. The battery packs used in such vehicles may be arranged at a position close to the road surface, such as under the vehicle body, while being housed in a housing case.

[0003] Patent Document 1 discloses a structure for protecting a battery pack by storing the battery pack in a housing case having a bottom formed in a lattice shape by a plurality of first skeleton members extending in the vehicle width direction and a plurality of second skeleton members extending in the vehicle longitudinal direction.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the housing case disclosed in Patent Document 1, the rigidity of the bottom plate of the housing case for protecting the battery pack is increased by forming a lattice shape with the first skeleton member and the second skeleton member. However, when the interference force received from the road surface during vehicle use is large, the bottom plate may not be able to absorb the force completely, which may affect the battery pack.

[0006] On the one hand, it is known to improve the rigidity of the bottom plate of the storage case by making the bottom plate corrugated. For example, FIGS. 6(a) and 6(b) show an example of a storage case with enhanced strength against road surface interference by making the cross-section of the bottom plate into a rectangular wave-shaped corrugated plate. However, when the cross-section of the bottom plate is rectangular wave-shaped as shown in FIG. 6(b), the flat part of the concave portion protruding downward under the vehicle has lower strength compared to other locations. Therefore, there is a desire to reinforce the low-strength portions of the bottom plate to improve the strength against road surface interference.

[0007] The present disclosure provides a storage case that reduces the influence of interference from the road surface on the battery pack within the storage case.

Means for Solving the Problem

[0008] The storage case according to the present disclosure is a storage case for a battery pack mounted on a vehicle and having a bottom plate disposed on the bottom surface, wherein the bottom plate has a rectangular wave-shaped cross-section perpendicular to the front and rear of the vehicle, and includes a bottom plate main body portion having a bottom plate concave portion protruding downward under the vehicle and a bottom plate convex portion protruding upward above the vehicle, and a plurality of first reinforcing members disposed in the bottom plate concave portion and extending in the front-rear direction of the vehicle. The first reinforcing member is a plate-shaped member having a hat-shaped cross-section perpendicular to the front-rear direction of the vehicle, and a cylinder portion is disposed in contact with the bottom plate concave portion. Thereby, the absorption amount of energy generated by road surface interference on the bottom plate can be increased.

Effect of the Invention

[0009] According to the present disclosure, it is possible to provide a storage case that reduces the influence of interference from the road surface on the battery pack within the storage case.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0011] Embodiment 1 Hereinafter, with reference to the drawings, the configuration of the housing case 1 in which a bottom plate is disposed on the bottom surface according to the present embodiment will be described. FIG. 1(a) is a bottom view showing the configuration of the bottom plate 10 of the housing case 1 according to Embodiment 1, and FIG. 1(b) is a cross-sectional view. More specifically, FIG. 1(a) is a view showing the housing case 1 with a battery pack stored therein from the viewpoint of the lower surface side when the housing case 1 is provided in a vehicle. In FIG. 1(a), the vertical direction of the figure is described as the front-rear direction of the vehicle, and the left-right direction of the figure is described as the width direction of the vehicle. Further, FIG. 1(b) is a cross-sectional view taken along a direction perpendicular to the width direction of the vehicle. Note that FIGS. 2(a) and 2(b) show the state of the bottom plate 10 before adding the first additional reinforcement member 13 to be described later, and a part of the configuration of the bottom plate 10 will be described with reference to FIGS. 2(a) and 2(b).

[0012] As shown in FIG. 1(a), the bottom plate 10 includes a bottom plate main body portion 11, a bottom plate mounting reinforcement member 12, and a first additional reinforcement member (first reinforcement member) 13. Hereinafter, first, the bottom plate 10 in a state where the first additional reinforcement member 13 is not provided will be described.

[0013] As shown in Fig. 2(b), the bottom plate main body 11 is a plate-shaped member with a rectangular wave-shaped cross-section perpendicular to the vehicle's front-rear direction. Here, in the cross-section perpendicular to the vehicle's front-rear direction, the bottom plate main body 11 has a plurality of bottom plate recesses 21 protruding downward from the vehicle and a plurality of bottom plate protrusions 22 protruding upward from the vehicle.

[0014] Here, each of the bottom plate recesses 21 is shaped to extend in the vehicle's front-rear direction. Similarly, each of the bottom plate protrusions 22 is also shaped to extend in the vehicle's front-rear direction. The bottom plate protrusion 22 functions as a corrugated bead and as a longitudinal grid in the bottom plate main body 11.

[0015] As shown in Fig. 2(a), the bottom plate mounting reinforcement member 12 is a reinforcement member extending in the vehicle's width direction. For example, the bottom plate mounting reinforcement member 12 is plate-shaped and extends in the vehicle's width direction. The bottom plate mounting reinforcement members 12 are arranged at intervals in the vehicle's front-rear direction and are connected to the bottom plate main body 11 at positions where they intersect the bottom plate protrusions 22 in the vehicle's up-down direction.

[0016] As shown in Fig. 1(a), the first additional reinforcement member 13 is a reinforcement member extending in the vehicle's front-rear direction. Also, the first additional reinforcement member 13 is arranged to abut against the bottom plate recess 21 and extends in the vehicle's front-rear direction.

[0017] As shown in Fig. 3, in the cross-section perpendicular to the vehicle's front-rear direction, the first additional reinforcement member 13 is a hat-shaped plate member. As shown in Fig. 1(b), the flange portion of the first additional reinforcement member 13 abuts against the bottom plate recess 21. Therefore, the first additional reinforcement member 13 and the bottom plate recess 21 form a rectangular closed cross-section with a part of the bottom plate recess 21 as one side.

[0018] For example, the bottom plate main body 11 and the first additional reinforcement member 13 are made of metal, and a steel plate can be used. The flange portion of the first additional reinforcement member 13 and the bottom plate recess 21 are fixed by welding.

[0019] Next, the calculation of the amount of damage energy absorbed during road surface interference with respect to the bottom plate 10 will be described. The amount of damage energy absorbed (EA amount) in the bottom plate 10 is calculated using the value of the reaction force load F generated during road surface interference and the value of the deformation stroke S of the bottom plate 10, EA amount = load F generated by the bottom plate × deformation stroke S and can be calculated by

[0020] Here, in the bottom plate main body portion 11, since the corrugated board beads, which are the locations of the bottom plate convex portions 22, extend in the vehicle longitudinal direction, the value of the load F generated by the bottom plate can be improved. Further, since the bottom plate mounting reinforcement member 12 extends in the vehicle width direction, the bottom plate convex portion 22 forms a lattice shape with vertical grids and the bottom plate mounting reinforcement member 12 forms horizontal grids, and the value of the load F generated by the bottom plate can be improved.

[0021] Furthermore, the bottom plate mounting reinforcement member 12 is arranged along the extending direction of the bottom plate recess 21 within the bottom plate recess 21, and the first additional reinforcement member 13 and the bottom plate recess 21 form a closed cross-section with a rectangular cross-section having a part of the bottom plate recess 21 as one side, whereby the value of the load F generated by the bottom plate can be improved. In FIGS. 1(b) and 2(b), the fact that the value of the load F generated by the bottom plate when the first additional reinforcement member 13 is added is larger than the value of the load F generated by the bottom plate in the state before the first additional reinforcement member 13 is added is indicated by the size of the arrow.

[0022] Therefore, since the value of the load F generated by the bottom plate can be improved, the EA amount, which is the energy absorption amount, can be improved. In other words, in the bottom plate 10 of the housing case 1, the amount of energy absorbed when road surface interference occurs can be increased, and the influence on the battery pack can be suppressed.

[0023] Note that in FIG. 2(b), the bottom plate main body portion 11 is described as having approximately six bottom plate recesses 21 and bottom plate convex portions 22 alternately formed in a cross-section perpendicular to the vehicle longitudinal direction, but these numbers can be arbitrarily changed. Similarly, the number of bottom plate mounting reinforcement members 12 can be changed.

[0024] Furthermore, the number of the first additional reinforcing members 13 provided in the bottom plate recesses 21 can be changed according to the number of the bottom plate recesses 21. Also, regarding the first additional reinforcing members 13, it is also possible to provide them only in any of the plurality of bottom plate recesses 21.

[0025] Since the EA amount is calculated by multiplying the bottom plate generated load F by the deformation stroke S, in order to improve the EA amount, it is conceivable to increase the value of the allowable deformation stroke S. Here, FIGS. 4(a) and 4(b) show an example in which a wide stroke is provided from the lower case of the battery pack to the bottom plate of the housing case in the related battery pack and housing case. However, as shown in FIG. 4(b), in order to increase the deformation stroke S, it is necessary to increase the size of the housing case, and since there is a limit to the increase in size, it is effective to improve the bottom plate generated load F in order to improve the EA amount.

[0026] Embodiment 2 Next, with reference to FIGS. 5(a) and 5(b), the configuration of the bottom plate 30 of the housing case 2 according to Embodiment 2 will be described. Note that the same reference numerals are given to the portions having the same configuration as the configuration of the bottom plate 10 of the housing case 1 shown in Embodiment 1, and the description thereof is omitted. FIG. 5(a) is a bottom view showing the configuration of the bottom plate 30 including the second reinforcing member 34 according to Embodiment 2, and FIG. 5(b) is a cross-sectional view.

[0027] The bottom plate 30 includes a bottom plate main body portion 11, a bottom plate mounting reinforcing member 12, a first additional reinforcing member 13, and a second additional reinforcing member (second reinforcing member) 34.

[0028] The second additional reinforcing member 34 is a reinforcing member extending in the vehicle width direction. More specifically, the second additional reinforcing member 34 is provided in parallel with the bottom plate mounting reinforcing member 12 extending in the vehicle width direction, and is alternately arranged with the bottom plate mounting reinforcing member 12 in the vehicle front-rear direction.

[0029] The lower surface of the second additional reinforcing member 34 extending in the vehicle width direction abuts against the upper ends of the plurality of respective first additional reinforcing members 13 and the upper ends of the plurality of bottom plate convex portions 22, and presses each of them downward. Thereby, in the second additional reinforcing member 34, when the vehicle receives road surface interference and the bottom plate 30 receives an upward force and deforms, a reaction force is generated so as to press the upper ends of the first additional reinforcing member 13 and the upper ends of the plurality of bottom plate convex portions 22 downward, thereby suppressing the opening deformation such that the cross section of the bottom plate 30 collapses. Here, in FIG. 5(b), it is shown by the size of the arrow that the value of the bottom plate generated load F when the second additional reinforcing member 34 is added is larger than the value of the bottom plate generated load F in the state where the second additional reinforcing member 34 shown in the first embodiment is not added.

[0030] Note that a sheet metal band can be used for the second additional reinforcing member 34. Here, the second additional reinforcing member 34 is in a state of being joined by welding to the upper ends of the respective bottom plate convex portions 22 and the first additional reinforcing members 13 that intersect in a bottom view. Also typically, when adding the second reinforcing member 34 to the bottom plate 30, after welding the second reinforcing member 34 and the first additional reinforcing member 13, the second reinforcing member 34 and the bottom plate convex portion 22 can be welded.

[0031] In this way, when the first additional reinforcing member 13 and the second additional reinforcing member 34 are provided in the battery pack, the value of the bottom plate generated load F can be improved as compared with the case where only the first additional reinforcing member 13 is provided. Therefore, in the bottom plate 30 of the housing case 2, the amount of energy absorption when road surface interference occurs can be made larger, and the influence on the battery pack housed in the housing case 2 can be suppressed.

[0032] Note that the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the gist. That is, the above description has been appropriately omitted and simplified for the sake of clarity of explanation, and those skilled in the art can easily change, add, and convert each element of the embodiment within the scope of the present invention.

[0033] If at least one of the second additional reinforcing members 34 is installed on the bottom plate 30, it is possible to achieve the effect of increasing the energy absorption amount. For example, when the second additional reinforcing member 34 is provided at a location on the bottom plate 30 where a load is likely to be applied, a sufficient effect can be obtained. Note that the thickness, width, and other dimensions of the sheet metal band used for the second additional reinforcing member 34 can be arbitrarily changed according to the balance between the required energy absorption amount of the bottom plate 30 and the weight, etc.

[0034] Also, for example, regarding the direction of the housing case 1 in the bottom view of each figure, the left - right direction was described as the vehicle front - rear direction and the up - down direction as the vehicle width direction, but the orientation when mounted on the vehicle may be changed.

Explanation of Signs

[0035] 1 Housing case 2 Housing case 10 Bottom plate 11 Bottom plate main body part 12 Bottom plate mounting reinforcing member 13 First additional reinforcing member 21 Bottom plate recess 22 Bottom plate protrusion 30 Bottom plate 34 Second additional reinforcing member

Claims

1. A housing case for a battery pack mounted on a vehicle and having a bottom plate disposed on the bottom surface, wherein the bottom plate has a bottom plate main body portion having a rectangular wave-shaped cross section perpendicular to the front and rear of the vehicle, with a bottom plate recess protruding downward from the vehicle and a bottom plate protrusion protruding upward from the vehicle, and is provided with a plurality of first reinforcing members disposed in the bottom plate recess and extending in the front-rear direction of the vehicle. The first reinforcing member is a plate-shaped member having a hat-shaped cross section perpendicular to the front-rear direction of the vehicle, and a flange portion is disposed in contact with the bottom plate recess. Housing case.

2. The housing case according to claim 1, further comprising a second reinforcing member extending in the width direction of the vehicle and joined to the upper ends of the plurality of respective first reinforcing members and the upper ends of the plurality of bottom plate protrusions. The housing case according to claim 1.

3. The second reinforcing member has a plurality provided on the bottom plate main body portion, and each is arranged at intervals from each other in the front-rear direction of the vehicle. The housing case according to claim 2.

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