Battery tray

Abstract

A battery tray according to the present invention is made of metal and has a side wall that includes a first member and a second member that is welded to the first member. One of the first member and the second member has a protrusion that is the same thickness as the one and protrudes toward the other, and the other has a recess that is the same thickness as the other and engages with the protrusion.

Description

Battery tray

[0001] The present disclosure relates to a battery tray.

[0002] Patent Document 1 discloses a battery tray that houses multiple batteries. The structural members that make up this battery tray include joints formed by butting together the edges of multiple extruded panels, each made of extruded material. One extruded panel has a first protruding piece that extends from the edge of the extruded panel along the front surface toward the other extruded panel, and the other extruded panel has a second protruding piece that extends from the edge of the extruded panel along the back surface toward the one extruded panel.

[0003] JP 2023-110830 A

[0004] In the battery tray disclosed in Patent Document 1, unless the thickness of the first protruding piece and the second protruding piece is strictly controlled, the thickness of the extruded panel cannot be maintained where the first protruding piece and the second protruding piece overlap.

[0005] In view of the above circumstances, an object of at least one embodiment of the present invention is to provide a battery tray that can maintain the thickness of the side walls of the battery tray.

[0006] (1) A battery tray according to at least one embodiment of the present invention is a metal battery tray, and the side wall of the battery tray includes a first member and a second member welded to the first member. Either the first member or the second member has a protrusion that protrudes toward the other member with the same thickness as the first member, and the other member has a recess that engages with the protrusion with the same thickness as the other member.

[0007] According to the above configuration (1), the convex portion protrudes toward the other with the same thickness as either the first member or the second member, and the concave portion that engages with the convex portion has the same thickness as the other, so that the thickness of the side wall of the battery tray can be maintained.

[0008] (2) In some embodiments, in the configuration of (1) above, the metal is an aluminum alloy.

[0009] According to the above configuration (2), the weight of the battery tray can be reduced.

[0010] (3) In some embodiments, in the configuration of (1) or (2) above, the first member includes a pair of elongated members facing each other, the second member includes a first connecting member connecting one ends of the pair of elongated members and a second connecting member connecting the other ends, the convex portions are provided at one end of each of the pair of elongated members and at both ends of the second connecting member, the concave portions are provided at the other ends of each of the pair of elongated members and at both ends of the first connecting member, the concave portion provided on one of the pair of elongated members has a complementary shape to the convex portion provided on the other, and the concave portion provided on the other has a complementary shape to the convex portion provided on the one.

[0011] According to the above configuration (3), the recess provided on one of the pair of elongated members has a complementary shape to the protrusion provided on the other, and the recess provided on the other has a complementary shape to the protrusion provided on one, so that when the cross-sectional shapes of the elongated members are symmetrical, it is possible to cut out one elongated member, the other elongated member, one elongated member, etc. from one material (for example, extruded material) in this order, thereby improving the yield of the material.

[0012] (4) In some embodiments, in the configuration of (1) or (2) above, the first member includes a pair of elongated members facing each other, the second member includes a first connecting member connecting one ends of the pair of elongated members and a second connecting member connecting the other ends, the convex portions are provided at one end and the other end of one of the pair of elongated members, at one end of the second connecting member to which the other end of one of the pair of elongated members is connected, and at one end of the first connecting member to which the other end of the pair of elongated members is connected, the recesses are provided at the other end and the other end of one of the pair of elongated members, at the other end of the first connecting member, and at the other end of the second connecting member, the recess provided on one of the pair of elongated members has a complementary shape to the convex portion provided on the other, and the recess provided on the other has a complementary shape to the convex portion provided on one of the pair of elongated members.

[0013] According to the above configuration (4), the recess provided on one of the pair of elongated members has a complementary shape to the protrusion provided on the other, and the recess provided on the other has a complementary shape to the protrusion provided on one, so that when the cross-sectional shapes of the pair of elongated members are symmetrical, it is possible to cut out one elongated member, the other elongated member, one elongated member, etc. from one material (for example, extruded material) in this order, thereby improving the yield of the material.

[0014] (5) In some embodiments, in the configuration of (1) or (2) above, the first member has a screw hole arranged along a direction from the second member toward the first member, and the second member has a through hole through which a bolt that fits into the screw hole passes.

[0015] According to the above configuration (5), the bolt passes through the through hole and fits into the screw hole, thereby fastening the second member to the first member, thereby increasing the connection strength of the second member to the first member.

[0016] (6) In some embodiments, in the configuration of (1) or (2) above, the first member is a long part having a constant cross-sectional shape, and the second member is a molded part that has been molded in advance.

[0017] According to the above configuration (6), the first member is a long part with a constant cross-sectional shape, and the second member is a molded part that has been molded in advance, so that the battery tray can be manufactured efficiently.

[0018] According to at least one embodiment of the present invention, the thickness of the sidewalls of the battery tray can be maintained.

[0019] 5 is a diagram conceptually showing the configuration of a side wall of a battery tray according to an embodiment; FIG. 6 is a side view showing another example (1) of convex portions and concave portions; FIG. 7 is a side view showing another example (2) of convex portions and concave portions; FIG. 8 is a side view showing another example (3) of convex portions and concave portions; FIG. 9 is a side view showing another example (4) of convex portions and concave portions; FIG. 10 is a side view showing another example (5) of convex portions and concave portions; FIG. 11 is a side view showing another example (6) of convex portions and concave portions; FIG. 12 is a diagram conceptually showing the configuration of a battery tray according to an embodiment 1; FIG. 13 is a diagram for explaining the yield of the elongated members shown in FIG. 3; FIG. 14 is a diagram conceptually showing the configuration of a battery tray according to an embodiment 2; FIG. 15 is a diagram for explaining the yield of the elongated members shown in FIG. 5; FIG. 16 is a diagram conceptually showing the configuration of a battery tray according to an embodiment 3; FIG. 17 is a diagram conceptually showing the configuration of a battery tray according to an embodiment 4;

[0020] Hereinafter, several embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present invention.

[0021] [Embodiment 1] [Battery Tray Configuration] The battery tray according to embodiment 1 is a component constituting the lower half of a battery pack mounted in a vehicle and is made of aluminum alloy (metal). As shown in FIG. 1( a), a side wall 10 of the battery tray includes a first member 12 and a second member 14 welded to the first member 12. The first member 12 and the second member 14 have the same thickness. As shown in FIG. 1( b), the first member 12 has a protrusion 16 that protrudes toward the second member 14 and has the same thickness as the first member 12. The second member 14 has a recess 18 that engages with the protrusion 16 and has the same thickness as the second member 14. The recess 18 has a shape complementary to the protrusion 16. A base end 16a of the protrusion 16 is provided on the abutting surface (reference surface 12A) between the first member 12 and the second member 14, and the recess 18 is provided on the second member 14 so as to be recessed from the reference surface 14A. In the example of Figure 1, the convex portion 16 is provided on the first member 12 and the concave portion 18 is provided on the second member 14, but the convex portion 16 may be provided on the second member 14 and the concave portion 18 may be provided on the first member 12.

[0022] 1 , the convex portion 16 is provided in the center of the side wall 10 in the height direction, has a flat surface at the tip 16b, and gradually becomes smaller in the height direction of the side wall 10 from the base end 16a (reference plane 12A) to the tip 16b. The upper surface 16c of the convex portion 16 is provided with an inclined surface that gradually becomes lower in the height direction of the side wall 10 from the base end 16a to the tip 16b, and the lower surface 16d of the convex portion 16 is provided with an inclined surface that gradually becomes higher in the height direction of the side wall 10 from the base end 16a to the tip 16b.

[0023] The recess 18 is provided at a position corresponding to the protrusion 16, i.e., at the center in the height direction of the side wall 10. The recess 18 gradually becomes smaller in the height direction of the side wall 10 from the base end 18a toward the back, and has a flat surface at the innermost part 18b. The upper surface 18c of the recess 18 is provided with an inclined surface that gradually becomes lower in the height direction of the side wall 10 from the base end 18a (reference surface 14A) toward the back, and the lower surface 18d of the recess 18 is provided with an inclined surface that gradually becomes higher in the height direction of the side wall 10 from the base end 18a toward the back.

[0024] 2-1 , the protrusion 16 is provided at the center in the height direction of the side wall 10. The protrusion 16 has a flat surface at its tip 16b, and has a constant height in the height direction of the side wall 10 from the base end 16a (reference surface 12A) to the tip 16b. The upper surface 16c and the lower surface 16d of the protrusion 16 each have a horizontal surface.

[0025] The recess 18 is provided at a position corresponding to the protrusion 16, i.e., at the center in the height direction of the side wall 10. The recess 18 has a constant height in the height direction of the side wall 10 from the base end 18a (reference surface 14A) toward the back, and has a flat surface at the innermost part 18b. The upper surface 18c and the lower surface 18d of the recess 18 each have a horizontal surface.

[0026] 2-2, the convex portion 16 is provided in the upper half of the height direction of the side wall 10. The tip 16b of the convex portion 16 has a flat surface, and has a constant height in the height direction of the side wall 10 from the base end 16a (reference surface 12A) to the tip 16b. The upper surface 16c of the convex portion 16 forms the upper surface of the side wall 10, and the lower surface 16d is provided with a horizontal surface.

[0027] The recess 18 is provided in the upper half of the height direction of the side wall 10. The recess 18 has a constant height in the height direction of the side wall 10 from the base end 18a (reference surface 14A) toward the back, and has a flat surface at the innermost part 18b. A horizontal surface is provided on the lower surface 18d of the recess.

[0028] 2-3 , the convex portion 16 is provided in a region on the lower side in the height direction of the side wall 10. The convex portion 16 has a flat surface at its tip 16b, which gradually becomes smaller in the height direction of the side wall 10 from its base end 16a (reference surface 12A) toward its tip 16b. The upper surface 16c of the convex portion 16 is provided with an inclined surface that gradually becomes smaller in the height direction of the side wall 10 from its base end 16a toward its tip 16b.

[0029] The recess 18 is provided in a region on the lower side in the height direction of the side wall 10. The recess 18 gradually becomes smaller in the height direction of the side wall 10 from the base end 18a (reference surface 14A) toward the back, and has a flat surface at the innermost part 18b. The lower surface 18d of the recess 18 is provided with an inclined surface that gradually becomes lower in the height direction of the side wall 10 from the base end 18a toward the innermost part 18b.

[0030] 2-4, the convex portion 16 is provided over the entire height of the side wall 10. The tip 16b of the convex portion 16 is pointed and gradually becomes smaller in the height direction of the side wall 10 from the base end 16a to the tip 16b. The upper surface 16c of the convex portion 16 is provided with an inclined surface that gradually becomes smaller in the height direction of the side wall 10 from the base end 16a to the tip 16b.

[0031] The recess 18 is provided over the entire height of the side wall 10, and the recess 18 gradually becomes smaller in the height direction of the side wall 10 from the base end 18a toward the back. The lower surface 18d of the recess 18 is provided with an inclined surface that gradually becomes lower in the height direction of the side wall 10 from the base end 16a toward the backmost 18b.

[0032] 2-5, the convex portion 16 is provided over the entire height of the side wall 10. The tip 16b of the convex portion 16 is pointed at the center of the height of the side wall 10 and gradually becomes smaller in the height direction of the side wall 10 from the base end 16a to the tip 16b. The upper surface 16c of the convex portion 16 is provided with an inclined surface that gradually becomes lower in the height direction of the side wall 10 from the base end 16a to the tip 16b, and the lower surface 16d of the convex portion 16 is provided with an inclined surface that gradually becomes higher from the base end 16a to the tip 16b.

[0033] The recess 18 is provided over the entire height of the side wall 10. The recess 18 gradually becomes smaller in the height direction of the side wall 10 from the base end 18a toward the back. The lower surface 18d of the recess 18 is provided with an inclined surface that gradually becomes lower in the height direction of the side wall 10 from the base end 18a toward the backmost 18b, and the upper surface 18c of the recess 18 is provided with an inclined surface that gradually becomes higher in the height direction of the side wall 10 from the base end 18a toward the backmost 18b.

[0034] 2-6 , there are multiple (e.g., three) protrusions 16, which are provided at the center, upper end, and lower end of the height direction of the side wall 10. Each of the protrusions 16 is pointed and gradually becomes smaller in the height direction of the side wall 10 from the base end 16a to the tip 16b. The upper surfaces 16c1 and 16c2 of the protrusions 16 are provided with inclined surfaces that gradually become lower in the height direction of the side wall 10 from the base end 16a to the tip 16b, and the lower surfaces 16d1 and 16d2 of the protrusions 16 are provided with inclined surfaces that gradually become higher from the base end 16a to the tip 16b.

[0035] There are multiple (e.g., three) recesses 18, and they are provided at the center, upper end, and lower end of the height direction of the side wall 10. Each recess 18 gradually becomes smaller in the height direction of the side wall 10 from the base end 18a toward the back. Upper surfaces 18c1 and 18c2 of the recesses 18 are provided with inclined surfaces that gradually decrease in the height direction of the side wall 10 from the base end 18a toward the innermost end 18b, and lower surfaces 18d1 and 18d2 of the recesses 18 are provided with inclined surfaces that gradually increase in the height direction of the side wall 10 from the base end 18a toward the innermost end 18b.

[0036] [Effects of the battery tray] According to the battery tray of embodiment 1, the convex portion 16 protrudes toward the second member 14 with the same thickness as the first member 12, and the concave portion 18 that engages with the convex portion 16 has the same thickness as the second member 14, so that the thickness of the side wall 10 of the battery tray can be maintained.

[0037] Furthermore, since the battery tray according to the first embodiment is made of an aluminum alloy, the weight of the battery tray can be reduced.

[0038] [Embodiment 2] [Configuration] The battery tray according to embodiment 2 has the same configuration as the battery tray according to embodiment 1. As shown in Fig. 3 , in the side wall 20 of the battery tray 2 according to embodiment 2, the first member 12 includes a pair of elongated members 21, 22 facing each other, and the second member 14 includes a first connecting member 23 connecting one ends 21 a, 22 a of the pair of elongated members 21, 22 to each other, and a second connecting member 24 connecting the other ends 21 b, 21 b to each other.

[0039] The convex portions 16 are provided on one ends 21 a, 22 a of each of the pair of elongated members 21, 22 and on both ends 24 a, 24 b of the second connecting member 24, and the concave portions 18 are provided on the other ends 21 b, 22 b of each of the pair of elongated members 21, 22 and on both ends 23 a, 23 b of the first connecting member 23. Hereinafter, the convex portion 16 provided on one elongated member 21 will be referred to as convex portion 25, the convex portion 16 provided on the other elongated member 22 will be referred to as convex portion 26, the concave portion 18 provided on one elongated member 21 will be referred to as concave portion 27, and the concave portion provided on the other elongated member 22 will be referred to as concave portion 28.

[0040] As shown in Figure 4, the recess 27 provided in one elongated member 21 has a complementary shape to the protrusion 26 provided in the other elongated member 22, and the recess 28 provided in the other elongated member 22 has a complementary shape to the protrusion 25 provided in one elongated member 21. In the battery tray 2 of embodiment 2, the convex portion 26 provided on the other elongated member 22 has the same shape as the convex portion 25 provided on one elongated member 21, and the recessed portion 28 provided on the other elongated member 22 has the same shape as the recessed portion 27 provided on one elongated member 21. However, as long as the recessed portion 27 provided on one elongated member 21 has a complementary shape to the convex portion 26 provided on the other elongated member 22 and the recessed portion 28 provided on the other elongated member 22 has a complementary shape to the convex portion 25 provided on one elongated member 21, the convex portions 25, 26 and the recessed portions 27, 28 do not have to have the same shape.

[0041] [Effect] According to the battery tray 2 of the second embodiment, the recess 27 provided in one elongated member 21 has a complementary shape to the protrusion 26 provided in the other elongated member 22, and the recess 28 provided in the other elongated member 22 has a complementary shape to the protrusion 25 provided in one elongated member 21. Therefore, when the cross-sectional shapes of the elongated members 21, 22 are symmetrical, it is possible to cut out one elongated member 21, the other elongated member 22, one elongated member 22, and so on from a single material (e.g., extruded material) in this order. This makes it possible to improve the yield of the material.

[0042] [Embodiment 3] A battery tray according to embodiment 3 has the same configuration as the battery tray according to embodiment 1. As shown in Fig. 5 , in the side wall 30 of the battery tray 3 according to embodiment 3, the first member 12 includes a pair of elongated members 31, 32 facing each other, and the second member 14 includes a first connecting member 33 connecting one ends 31 a, 32 a of the pair of elongated members 31, 32 to each other, and a second connecting member 34 connecting the other ends 31 b, 32 b to each other.

[0043] The convex portions 16 are provided on one end 31 a of one elongated member 31 and the other end 32 b of the other elongated member, on one end 34 a of the second connecting member 34 to which the other end 31 b of the one elongated member 31 is connected, and on one end 33 a of the first connecting member 33 to which the one end 32 a of the other elongated member 32 is connected. The concave portions 18 are provided on the other end 31 b of one elongated member 31 and the one end 32 a of the other elongated member 32, and on the other end 33 b of the first connecting member 33 and the other end 34 b of the second connecting member 34. Hereinafter, the convex portion 16 provided on one elongated member 31 will be referred to as convex portion 35, the convex portion 16 provided on the other elongated member 32 will be referred to as convex portion 36, the concave portion 18 provided on one elongated member 31 will be referred to as concave portion 37, and the concave portion 18 provided on the other elongated member 32 will be referred to as concave portion 38.

[0044] As shown in Figure 6, the recess 37 provided in one elongated member 31 has a complementary shape to the protrusion 36 provided in the other elongated member 32, and the recess 38 provided in the other elongated member 32 has a complementary shape to the protrusion 35 provided in one elongated member 31. In addition, in the battery tray 3 of embodiment 3, the convex portion 36 provided on the other elongated member 32 has the same shape as the convex portion 35 provided on one elongated member 31, and the recessed portion 38 provided on the other elongated member 32 has the same shape as the recessed portion 37 provided on one elongated member 31. However, as long as the recessed portion 37 provided on one elongated member 31 has a complementary shape to the convex portion 36 provided on the other elongated member 32 and the recessed portion 38 provided on the other elongated member 32 has a complementary shape to the convex portion 35 provided on one elongated member 31, the convex portions 35, 36 and the recessed portions 37, 38 do not have to have the same shape.

[0045] [Effects] According to the battery tray 3 of the third embodiment, the recess 37 provided in one elongated member 31 has a complementary shape to the protrusion 36 provided in the other elongated member 32, and the recess 38 provided in the other elongated member 32 has a complementary shape to the protrusion 35 provided in one elongated member 31. Therefore, when the cross-sectional shapes of the pair of elongated members 31, 32 are symmetrical, it is possible to cut out one elongated member 31, the other elongated member 32, one elongated member 31, and so on from a single material (e.g., extruded material) in this order. This makes it possible to improve the yield of the material.

[0046] [Embodiment 4] [Configuration] The battery tray according to embodiment 4 has the same configuration as the battery tray according to embodiment 3. As shown in Fig. 7 , in the side wall 40 of the battery tray 4 according to embodiment 4, the first member 12 has a screw hole 45 provided along a direction from the second member 14 toward the first member 12, and the second member 14 has a through hole 47 through which a bolt 46 that fits into the screw hole 45 passes. For example, in the example shown in Fig. 7 , the other ends 41b, 42b of a pair of facing elongated members 41, 42 each have a screw hole 45 that extends along a direction from the second connecting member 44 toward each of the pair of elongated members 41, 42, and the second connecting member 44 has a through hole 47 through which a bolt 46 that fits into the screw hole 45 passes. In the example shown in Figure 7, screw holes 45 are provided at the other ends 41b, 42b of the elongated members 41, 42, and a through hole 47 is provided in the second connecting member 44, but screw holes 41a, 41b may be provided at one end of the elongated members 41, 42, and a through hole may be provided in the first connecting member 43.

[0047] [Effect] According to the battery tray 4 of embodiment 4, the bolt 46 passes through the through hole 47 and fits into the screw hole 45, thereby fastening the second member 14 to the first member 12, thereby increasing the connection strength of the second member 14 to the first member 12.

[0048] [Embodiment 5] The battery tray according to embodiment 5 has the same configuration as the battery tray according to embodiment 4. As shown in Fig. 8 , in the side wall 50 of the battery tray 5 according to embodiment 5, the first member 12 is a long part having a uniform cross-sectional shape, and the second member 14 is a molded part that has been preformed. For example, in the example shown in Fig. 8 , a pair of opposing long members 51, 52 are long parts (extruded members) having a uniform cross-sectional shape, and a first connecting member 53 connecting one end 51 a, 52 a of the pair of long members 51, 52 and a second connecting member 54 connecting the other ends 51 b, 52 b of the pair of long members 51, 52 are preformed molded parts. The long parts are made of A5000 series materials including A5052 and A6000 series materials including A6063. The molded parts are made of a material such as AC4B, but TIG welding is possible by using an A4000 series material as a filler metal.

[0049] [Effect] According to the battery tray 5 of embodiment 5, the first member 12 is a long part with a constant cross-sectional shape, and the second member 14 is a molded part that has been pre-formed, so the battery tray 5 can be manufactured efficiently.

[0050] The present invention is not limited to the above-described embodiments, and includes modifications to the above-described embodiments and appropriate combinations of these modifications.

[0051] The vehicle in which the battery pack constituted by the battery tray according to the above-described embodiment is mounted is an electric vehicle such as a battery electric vehicle (BEV) powered by a motor, a hybrid vehicle (HV) powered by an engine and a motor, or a fuel cell vehicle (FCV). A hybrid vehicle is, for example, a plug-in hybrid vehicle (PHEV, PHV) that can be charged from an external power source or can externally supply power to an external device, but is not limited to a plug-in hybrid vehicle. The battery pack may be mounted inside the vehicle cabin or outside the vehicle cabin (for example, under the floor).

[0052] DESCRIPTION OF SYMBOLS 10 Side wall of battery tray 12 First member 12A Reference surface 14 Second member 14A Reference surface 16 Convex portion 16a Base end 16b Tip 16c Upper surface 16d Lower surface 18 Recessed portion 18a Base end 18b Innermost portion 18c Upper surface 18d Lower surface 2 Battery tray 20 Side wall of battery tray 21, 22 Elongated member 21a, 22a One end of elongated member 21b, 22b Other end of elongated member 23 First connecting member 23a One end of first connecting member 23b Other end of first connecting member 24 Second connecting member 24a One end of second connecting member 24b Other end of second connecting member 25, 26 Convex portion 27, 28 Recessed portion 3 Battery tray 30 Side wall of battery tray 31, 32 Elongated member 31a, 32a One end of elongated member 31b, 32b Other end of elongated member 33 First connecting member 33a One end of first connecting member 33b Other end of first connecting member 34 Second connecting member 34a One end of second connecting member 34b Other end of second connecting member 35, 36 Convex portion 37, 38 Concave portion 4 Battery tray 40 Side wall of battery tray 41, 42 Elongated member 41a, 42a One end of elongated member 41b, 41c Other end of elongated member 43 First connecting member 44 Second connecting member 45 Screw hole 46 Bolt 47 Through hole 5 Battery tray 50 Side wall of battery tray 51, 52 Elongated member 53 First connecting member 54 Second connecting member

Claims

1. A battery tray made of metal, wherein a side wall of the battery tray includes a first member and a second member welded to the first member, and either the first member or the second member has a convex portion that protrudes toward the other member with the same thickness as the one, and the other member has a concave portion that engages with the convex portion with the same thickness as the other.

2. The battery tray of claim 1, wherein the metal is an aluminum alloy.

3. A battery tray as described in claim 1 or 2, wherein the first member includes a pair of elongated members facing each other, the second member includes a first connecting member connecting one ends of the pair of elongated members and a second connecting member connecting the other ends, the convex portions are provided on one end of each of the pair of elongated members and on both ends of the second connecting member, the concave portions are provided on the other ends of each of the pair of elongated members and on both ends of the first connecting member, the concave portion provided on one of the pair of elongated members has a complementary shape to the convex portion provided on the other of the pair of elongated members, and the concave portion provided on the other of the pair of elongated members has a complementary shape to the convex portion provided on the one of the pair of elongated members.

4. A battery tray as described in claim 1 or 2, wherein the first member includes a pair of elongated members facing each other, the second member includes a first connecting member connecting one ends of the pair of elongated members and a second connecting member connecting the other ends of the pair of elongated members, the convex portions are provided on one end and the other end of the pair of elongated members, one end of the second connecting member to which the other end of the one of the pair of elongated members is connected, and one end of the first connecting member to which the other end of the other of the pair of elongated members is connected, the recesses are provided on the other end and the other end of the one of the pair of elongated members, the other end of the first connecting member, and the other end of the second connecting member, the recess provided on one of the pair of elongated members has a complementary shape to the convex portion provided on the other, and the recess provided on the other has a complementary shape to the convex portion provided on the one.

5. A battery tray as described in claim 1 or 2, wherein the first member has a screw hole provided along a direction from the second member toward the first member, and the second member has a through hole through which a bolt that fits into the screw hole passes.

6. A battery tray as described in claim 1 or 2, wherein the first member is an elongated part having a constant cross-sectional shape, and the second member is a molded part that is molded in advance.

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