Energy storage device and vehicle body structure

Abstract

The thickness of the adhesive layer is kept nearly constant. [Solution] The energy storage device comprises a case frame having a first joining surface and a case body that houses an energy storage module. The energy storage device has a case cover that is attached to the case body and has a second joining surface facing the first joining surface. The energy storage device has an adhesive layer provided between the first joining surface and the second joining surface, which joins the case body and the case cover to each other. At least one of the first joining surface and the second joining surface has a plurality of protrusions whose tip surfaces are curved.

Description

Technical Field

[0001] The present disclosure relates to a power storage device and a vehicle body structure.

Background Art

[0002] Electric vehicles such as electric cars and hybrid vehicles have a battery pack as a power storage device. The battery pack has a battery case and battery modules housed in the battery case. As a structure of the battery case, a structure in which a pair of case parts are adhered to each other has been proposed (see Patent Document 1). In addition, when mounting a battery pack on an electric vehicle, it is also conceivable to adhere the battery case to the vehicle body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when using an adhesive in the manufacturing process of mass-produced products, from the viewpoint of ensuring the bonding quality by the adhesive, it is required to make the thickness of the adhesive layer substantially constant. However, since the adhesive has fluidity, it has been difficult to make the thickness of the adhesive layer substantially constant.

Means for Solving the Problems

[0005] According to this disclosure, the energy storage device comprises a case frame having a first bonding surface and a case body housing an energy storage module. The energy storage device has a case cover attached to the case body, which has a second bonding surface facing the first bonding surface. The energy storage device has an adhesive layer provided between the first bonding surface and the second bonding surface, which bonds the case body and the case cover to each other. At least one of the first bonding surface and the second bonding surface has a plurality of protrusions whose leading edges are curved.

[0006] According to this disclosure, the vehicle body structure has a floor panel provided at the lower part of the vehicle body and having a floor joint surface. The vehicle body structure has a case joint surface facing the floor joint surface and has a power storage case that houses a power storage module. The vehicle body structure has an adhesive layer provided between the floor joint surface and the case joint surface, which joins the floor panel and the power storage case to each other. At least one of the floor joint surface and the case joint surface has a plurality of protrusions whose leading edges are curved. [Effects of the Invention]

[0007] According to this disclosure, the thickness of the adhesive layer can be kept substantially constant. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 shows a vehicle equipped with an energy storage device according to an embodiment of the present disclosure. [Figure 2] Figure 2 is a cross-sectional view showing the underbody along the line F2-F2 in Figure 1. [Figure 3] Figure 3 shows the case body viewed from the direction of arrow F3 in Figure 2, that is, from above. [Figure 4] Figure 4 shows the case cover from the direction of arrow F4 in Figure 2, that is, from the bottom. [Figure 5] Figure 5 shows the process of joining the case body and the case cover. [Figure 6] Figure 6 is a cross-sectional view showing the energy storage device of modified example 1. [Figure 7] Figure 7 is a cross-sectional view showing the energy storage device of modified example 2. [Figure 8] Figure 8 is a cross-sectional view showing the energy storage device of Modification 3. [Figure 9] Figure 9 is a cross-sectional view showing the underbody of a vehicle body that constitutes a vehicle body structure according to an embodiment of the present disclosure. [Figure 10] Figure 10 shows the battery case viewed from the direction of arrow F10 in Figure 9, i.e., from above. [Figure 11] Figure 11 shows the process of joining the floor panel to the battery case. [Figure 12] Figure 12 is a cross-sectional view showing the underbody that constitutes the vehicle body structure of Modified Example 4. [Figure 13] Figure 13 is a cross-sectional view showing the underbody that constitutes the vehicle body structure of Modified Example 5. [Modes for carrying out the invention]

[0009] Embodiments of this disclosure will be described in detail below with reference to the drawings. In the following description, identical or substantially identical components and elements will be denoted by the same reference numerals, and repeated descriptions will be omitted.

[0010] <First Embodiment> <Vehicle> Figure 1 shows a vehicle 11 equipped with a battery pack (energy storage device) 10, which is an embodiment of the present disclosure. As shown in Figure 1, the vehicle 11 has a body 14 consisting of an underbody 12 and an upper body 13. The vehicle 11 also has an electric axle 17 consisting of an electric motor 15 and a differential mechanism 16, etc., and a battery pack 10 provided on the underbody 12. The battery pack 10 is connected to the electric motor 15 of the electric axle 17 via an inverter 18.

[0011] Figure 2 is a cross-sectional view showing the underbody 12 along the line F2-F2 in Figure 1. As shown in Figure 2, the underbody 12 has a pair of side sills 20, 21 positioned on the left and right sides in the vehicle width direction, a floor panel 22 joined to the pair of side sills 20, 21, and an under panel 23 positioned below the floor panel 22 and joined to the pair of side sills 20, 21. The underbody 12 also has a battery housing compartment 24 partitioned by the floor panel 22, the under panel 23, and the side sills 20, 21. The battery pack 10 is housed in the battery housing compartment 24 of the underbody 12.

[0012] <Battery Pack> As shown in Figure 2, the battery pack 10 has a battery case 31 that houses a plurality of battery modules 30. The battery case 31 has a case body 32 that houses the battery modules (energy storage modules) 30, and a case cover 35 that is attached to the upper surface (first joining surface) 34 of the case frame 33 that constitutes the case body 32. The battery case 31 is also attached to the under panel 23. The battery module 30 is composed of a plurality of battery cells (not shown) that are connected to each other.

[0013] FIG. 3 is a view showing the case body 32 in the direction of arrow F3 in FIG. 2, that is, from above, and FIG. 4 is a view showing the case cover 35 in the direction of arrow F4 in FIG. 2, that is, from below. As shown in FIGS. 2 and 3, the case body 32 includes a case frame body 33 composed of four extrusions 36a, 36b, 36c, 36d arranged in a rectangular shape, and a plate 38 attached to the lower surface 37 of the case frame body 33. As shown in FIGS. 2 and 4, the case cover 35 has a joint surface (second joint surface) 40 provided with a predetermined width dimension at the outer edge portion, that is, a joint surface 40 facing the upper surface 34 of the case frame body 33. The case cover 35 is provided with a plurality of protrusions 41 over substantially the entire area of the joint surface 40. The dashed-dotted line L1 shown in FIG. 4 is a line indicating the boundary of the joint surface 40 provided on the case cover 35. As shown in the enlarged portion of FIG. 2, the protrusion 41 provided on the case cover 35 has a curved tip surface 41a. A plurality of protrusions 41 can be formed on the case cover 35, which is a sheet metal part, by pressing.

[0014] <Joining of the case body and the case cover> FIG. 5 is a view showing the joining process of the case body 32 and the case cover 35. As shown in FIG. 5, in the joining process of the case body 32 and the case cover 35, a manufacturing apparatus (not shown) applies a structural adhesive 42 such as an epoxy-based adhesive (hereinafter referred to as the adhesive 42) to the upper surface 34 of the case frame body 33. As shown by the dashed-dotted line α in FIG. 3, the adhesive 42 is applied over the entire circumference of the case frame body 33 so as to surround the battery module 30. As shown in FIG. 5, when the adhesive 42 is applied, the manufacturing apparatus moves the case cover 35 in the direction of arrow β until it contacts the case body 32, and presses the case cover 35 against the case body 32 until the adhesive 42 cures.

[0015] As a result, as shown in the enlarged portion of FIG. 2, an adhesive layer 43 for joining the case body 32 and the case cover 35 is provided between the upper surface 34 of the case frame body 33 and the joint surface 40 of the case cover 35. That is, an adhesive layer 43 made of the cured adhesive 42 is provided between the upper surface 34 of the case frame body 33 and the joint surface 40 of the case cover 35. The adhesive layer 43 not only has a function of joining the case body 32 and the case cover 35, but also has a waterproof function of preventing water from entering the battery case 31.

[0016] Here, since the protrusion 41 of the case cover 35 contacts the case frame body 33, the interval X1 between the upper surface 34 of the case frame body 33 and the joint surface 40 of the case cover 35 is determined by the protrusion 41. That is, since the thickness dimension of the adhesive layer 43 is determined by the height dimension of the protrusion 41, the thickness of the adhesive layer 43 provided in each of the battery cases 31 which are mass-produced can be made substantially constant. Thereby, when the battery pack 10 is mass-produced, the variation in the joining strength of each battery case 31 can be suppressed, and the quality of each battery case 31 can be stabilized.

[0017] For example, when the viscosity of the adhesive 42 decreases as the temperature rises, the adhesive 42 becomes easier to flow, so the adhesive layer 43 tends to become thinner. On the other hand, when the viscosity of the adhesive 42 increases as the temperature drops, the adhesive 42 becomes more difficult to flow, so the adhesive layer 43 tends to become thicker. Thus, even in a situation where the viscosity of the adhesive 42 changes, since the interval X1 between the case frame body 33 and the case cover 35 is determined by the protrusion 41, the thickness of the adhesive layer 43 provided in each mass-produced battery case 31 can be made substantially constant.

[0018] Furthermore, since the tip surface 41a of the projection 41 has a curved shape, the projection 41 of the case cover 35 makes point contact with the upper surface 34 of the case frame 33. This stabilizes the contact state of the case cover 35 with respect to the case frame 33, and improves the dimensional accuracy of the gap X1 between the case frame 33 and the case cover 35. In addition, by providing the projection 41 on the joining surface 40 of the case cover 35, the surface area of ​​the joining surface 40 can be increased, thereby increasing the bonding area between the case cover 35 and the adhesive layer 43. This improves the bonding strength between the case cover 35 and the adhesive layer 43.

[0019] <Variations 1, 2> In the example shown in Figure 2, the case cover 35 is provided with multiple protrusions 41, but this is not the only option; the multiple protrusions 41 may be provided on at least one of the case cover 35 or the case body 32. Figure 6 is a cross-sectional view showing a modified example 1 of the battery pack (energy storage device) 50, and Figure 7 is a cross-sectional view showing a modified example 2 of the battery pack (energy storage device) 60. Figures 6 and 7 show parts similar to those shown in Figure 2.

[0020] As shown in Figure 6, the battery pack 50 provided in the underbody 12 has a battery case 51 that houses the battery module 30. The battery case 51 has a case body 52 that houses the battery module 30 and a case cover 54 that is attached to the upper surface (first joining surface) 53 of the case body 52. ​​The case cover 54 also has a joining surface (second joining surface) 55 that faces the upper surface 53 of the case body 52. ​​The upper surface 53 of the case body 52 has a plurality of protrusions 56, and the joining surface 55 of the case cover 54 is formed flat. The plurality of protrusions 56 provided on the case body 52 have curved tip surfaces 56a.

[0021] Thus, even when multiple protrusions 56 are provided on the case body 52, the distance X1a between the case body 52 and the case cover 54 is determined by the protrusions 56. In other words, similar to the battery pack 10 described above, the thickness of the adhesive layer 57 provided on each mass-produced battery case 51 can be kept almost constant. This makes it possible to suppress variations in the bonding strength of each battery case 51 and stabilize the quality of each battery case 51.

[0022] As shown in Figure 7, the battery pack 60 provided on the underbody 12 has a battery case 61 that houses the battery module 30. The battery case 61 has a case body 62 that houses the battery module 30 and a case cover 64 that is attached to the upper surface (first joining surface) 63 of the case body 62. The case cover 64 also has a joining surface (second joining surface) 65 that faces the upper surface 63 of the case body 62. The upper surface 63 of the case body 62 has a plurality of protrusions 66, and the joining surface 65 of the case cover 64 has a plurality of protrusions 67. The plurality of protrusions 66 provided on the case body 62 have a curved tip surface 66a, and the plurality of protrusions 67 provided on the case cover 64 have a curved tip surface 67a.

[0023] Thus, even when multiple protrusions 66 and 67 are provided on both the case body 62 and the case cover 64, the distance X1b between the case body 62 and the case cover 64 is determined by the protrusions 66 and 67. In other words, similar to the battery pack 10 described above, the thickness of the adhesive layer 68 provided on each mass-produced battery case 61 can be kept almost constant. This makes it possible to suppress variations in the bonding strength of each battery case 61 and stabilize the quality of each battery case 61. Note that the protrusions 66 and 67 are formed in positions where they do not come into contact with each other.

[0024] <Variation 3> In the example shown in Figure 2, the case body 32 and the case cover 35 are joined via an adhesive layer 43, but this is not the only option. In addition to the adhesive layer 43, fasteners such as bolts or rivets may also be used to join the case body 32 and the case cover 35. Figure 8 is a cross-sectional view showing a modified example 3 of the battery pack (energy storage device) 70. Figure 8 shows parts similar to those shown in Figure 2.

[0025] As shown in Figure 8, the battery pack 70 provided in the underbody 12 has a battery case 31 that houses the battery module 30. The case body 32 and case cover 35 that make up the battery case 31 are joined to each other via an adhesive layer 71 and also joined to each other using tapered screws 72 which are fasteners. This makes it possible to more firmly join the case body 32 and the case cover 35.

[0026] Thus, even when joining the battery case 31 using tapered threads 72, it is possible to prevent the adhesive from getting caught in the tapered threads 72, allowing the tapered threads 72 to function properly. In other words, the designer of the battery case 31 can determine the thickness of the adhesive layer 71 by the height dimension of the projection 41, so that the width of the adhesive application can be designed to be narrow while ensuring the necessary bonding strength. This makes it possible to determine the adhesive application position while avoiding the mounting location of the tapered threads 72, and to prevent the adhesive from getting caught in the tapered threads 72. Although tapered threads 72 are used as fasteners, they are not the only fasteners, and bolts, rivets, etc. may also be used.

[0027] <Second Embodiment> In the above description, the spacings X1, X1a, X1b between the case bodies 32, 52, 62 and the case covers 35, 54, 64 are defined by projections 41, 56, 66, 67, but this is not the only way; the spacing between the floor panel 22 and the battery cases 31, 51, 61 may also be defined by projections. Here, Figure 9 is a cross-sectional view showing the underbody 82 of the vehicle body 81 that constitutes the vehicle body structure 80 according to the embodiment of this disclosure. Figure 9 shows the same parts as shown in Figure 2. Also, Figure 10 is a view of the battery case 86 from the direction of arrow F10 in Figure 9, that is, from above.

[0028] As shown in Figure 9, the underbody (lower part) 82 of the vehicle body 81, which constitutes the vehicle body structure 80, has a pair of side sills 20, 21 arranged on the left and right sides in the vehicle width direction, and a floor panel 22 joined to the pair of side sills 20, 21. The underbody 82 also has a battery bracket 83 joined to the right side sill 20 and a battery bracket 84 joined to the left side sill 21. As will be described later, the battery pack 85 is held by the floor panel 22 and the battery brackets 83, 84. The battery pack 85 has a battery case (energy storage case) 86 that houses a plurality of battery modules (energy storage modules) 30. The battery case 86 has a case body 32 that houses the battery modules 30 and a case cover 87 attached to the case body 32.

[0029] As shown in Figures 9 and 10, the case cover 87 has a case joining surface 88 provided on its outer edge with a predetermined width. The dashed line L2 shown in Figure 10 indicates the boundary of the case joining surface 88 provided on the case cover 87. Also, as shown in Figure 9, the floor panel 22 has a floor joining surface 89 facing the case joining surface 88. As shown in Figures 9 and 10, the case cover 87 has multiple protrusions 90 extending over almost the entire area of ​​the case joining surface 88. As shown in the enlarged portion of Figure 9, the protrusions 90 provided on the case cover 87 have a curved tip surface 90a. The case cover 87, being a sheet metal part, can be formed with multiple protrusions 90 by press working.

[0030] Figure 11 shows the joining process between the floor panel 22 and the battery case 86. As shown in Figure 11, in the joining process between the floor panel 22 and the battery case 86, a manufacturing apparatus (not shown) applies a structural adhesive 91, such as an epoxy adhesive (hereinafter referred to as adhesive 91), to the case joining surface 88 of the battery case 86. As shown by the dashed line α2 in Figure 10, the adhesive 91 is applied around the entire circumference of the case joining surface 88. As shown in Figure 10, once the adhesive 91 is applied, the manufacturing apparatus moves the battery case 86 in the direction of arrow β2 until it contacts the floor panel 22, and presses the battery case 86 against the floor panel 22 until the adhesive 91 hardens.

[0031] As a result, as shown in the enlarged portion of Figure 9, an adhesive layer 92 is provided between the floor joint surface 89 of the floor panel 22 and the case joint surface 88 of the battery case 86 to bond the floor panel 22 and the battery case 86 to each other. In other words, an adhesive layer 92 made of cured adhesive 91 is provided between the floor joint surface 89 of the floor panel 22 and the case joint surface 88 of the battery case 86.

[0032] Here, since the projection 90 of the battery case 86 contacts the floor panel 22, the distance X2 between the floor joint surface 89 of the floor panel 22 and the case joint surface 88 of the battery case 86 is determined by the projection 90. In other words, the thickness dimension of the adhesive layer 92 is determined by the height dimension of the projection 90, so the thickness of the adhesive layer 92 provided on each mass-produced vehicle body 81 can be made almost constant. This makes it possible to suppress variations in the bonding strength of the battery case 86 to the floor panel 22 and stabilize the quality of the vehicle body 81.

[0033] Furthermore, since the tip surface 90a of the projection 90 has a curved shape, the projection 90 of the battery case 86 makes point contact with the floor panel 22. This stabilizes the contact state of the battery case 86 with respect to the floor panel 22, and improves the dimensional accuracy of the gap X2 between the floor panel 22 and the battery case 86. In addition, by providing the projection 90 on the case joining surface 88 of the battery case 86, the surface area of ​​the case joining surface 88 can be increased, thereby increasing the bonding area between the battery case 86 and the adhesive layer 92. This improves the bonding strength between the battery case 86 and the adhesive layer 92.

[0034] <Modified examples 4, 5> In the example shown in Figure 9, multiple protrusions 90 are provided on the battery case 86, but this is not the only option, and multiple protrusions 90 may be provided on at least one of the floor panel 22 and the battery case 86. Figure 12 is a cross-sectional view showing the underbody 102 that constitutes the vehicle body structure 100 of Modification 4, and Figure 13 is a cross-sectional view showing the underbody 112 that constitutes the vehicle body structure 120 of Modification 5. Figures 12 and 13 show parts similar to those shown in Figure 9.

[0035] As shown in Figure 12, the underbody (lower part) 102 of the vehicle body 101 that constitutes the vehicle body structure 100 has a pair of side sills 20, 21 arranged on the left and right sides in the vehicle width direction, and a floor panel 103 joined to the pair of side sills 20, 21. The battery pack 104 joined to the floor panel 103 has a battery case (energy storage case) 105 that houses a plurality of battery modules 30. The battery case 105 has a case body 32 that houses the battery modules 30 and a case cover 106 that is attached to the case body 32.

[0036] The case cover 106 has a case joining surface 107 provided on its outer edge with a predetermined width. The floor panel 103 also has a floor joining surface 108 facing the case joining surface 107. As shown in the enlarged portion of Figure 12, the floor joining surface 108 of the floor panel 103 is provided with a plurality of protrusions 109, while the case joining surface 107 of the case cover 106 is formed flat. The plurality of protrusions 109 provided on the floor panel 103 are provided with curved tip surfaces 109a.

[0037] Thus, even when multiple protrusions 109 are provided on the floor panel 103, the distance X2a between the floor panel 103 and the battery case 105 is determined by the protrusions 109. In other words, similar to the vehicle body structure 80 described above, the thickness of the adhesive layer 110 provided on each mass-produced vehicle body 101 can be kept almost constant. This makes it possible to suppress variations in the bonding strength of the battery case 105 to the floor panel 103 and stabilize the quality of the vehicle body 101.

[0038] As shown in Figure 13, the underbody (lower part) 122 of the vehicle body 121 that constitutes the vehicle body structure 120 has a pair of side sills 20, 21 arranged on the left and right sides in the vehicle width direction, and a floor panel 123 joined to the pair of side sills 20, 21. The battery pack 124 joined to the floor panel 123 has a battery case (energy storage case) 125 that houses a plurality of battery modules 30. The battery case 125 has a case body 32 that houses the battery modules 30 and a case cover 126 attached to the case body 32.

[0039] The case cover 126 has a case joining surface 127 provided on its outer edge with a predetermined width. The floor panel 123 also has a floor joining surface 128 facing the case joining surface 127. As shown in the enlarged portion of Figure 13, the floor joining surface 128 of the floor panel 123 has a plurality of protrusions 129, and the case joining surface 127 of the case cover 126 has a plurality of protrusions 130. The plurality of protrusions 129 provided on the floor panel 123 have a curved tip surface 129a, and the plurality of protrusions 130 provided on the battery case 125 have a curved tip surface 130a.

[0040] Thus, even when multiple protrusions 129, 130 are provided on both the floor panel 123 and the battery case 125, the distance X2b between the floor panel 123 and the battery case 125 is determined by the protrusions 129, 130. In other words, similar to the vehicle body structure 80 described above, the thickness of the adhesive layer 131 provided on each mass-produced vehicle body 121 can be made almost constant. This makes it possible to suppress variations in the bonding strength of the battery case 125 to the floor panel 123 and stabilize the quality of the vehicle body 121. Note that the protrusions 129, 130 are formed in positions where they do not come into contact with each other.

[0041] <Other variations> The present invention is not limited to the embodiments described above, and can be modified in various ways without departing from its essence. For example, in the examples shown in Figures 2 and 9, the height dimensions of all the protrusions 41 and 90 are the same, but the invention is not limited to this, and some of the protrusions 41 and 90 may be formed lower than the others. In the examples shown in Figures 2 and 9, the tip surfaces 41a and 90a of the protrusions 41 and 90 are formed by spherical surfaces with constant curvature, but the invention is not limited to this, and the tip surfaces 41a and 90a of the protrusions 41 and 90 may be formed by curved surfaces with varying curvature. Also, in the examples shown, the protrusions 41, 56, 66, 67, 90, 109, 129, and 130 are formed by press working, but the invention is not limited to this, and the protrusions 41, 56, 66, 67, 90, 109, 129, and 130 may be formed by other processing methods.

[0042] In the illustrated example, battery packs 10, 50, 60, and 70 are mounted on the vehicle 11, but this is not limited to this, and battery packs 10, 50, 60, and 70 may also be used as power sources for other devices. For example, in the example shown in Figure 9, the battery case 86 is joined to the floor panel 22 via an adhesive layer 92, but this is not limited to this, and the battery case 86 may also be joined to the floor panel 22 by using fasteners such as tapered screws in addition to the adhesive layer 92.

[0043] In the above description, epoxy adhesives are used as adhesives 42 and 91, but the invention is not limited to these; acrylic adhesives or urethane adhesives may also be used as adhesives 42 and 91. In the above description, a battery module 30 is used as the energy storage module, but the invention is not limited to this; a capacitor module may also be used as the energy storage module. Furthermore, metal materials such as aluminum alloys and steel can be used as the materials for the battery cases 31, 51, 61, 86, 105, 125 and floor panels 22, 103, 123, and composite materials such as carbon fiber reinforced plastics can also be used. [Explanation of symbols]

[0044] 10...Battery pack (energy storage device), 22...Floor panel, 30...Battery module (energy storage module), 32...Case body, 34...Top surface (first bonding surface), 35...Case cover, 40...Bonding surface (second bonding surface), 41...Protrusion, 41a...Tip surface, 43...Adhesive layer, 50...Battery pack (energy storage device), 52...Case body, 53...Top surface (first bonding surface), 54...Case cover, 55...Bonding surface (second bonding surface), 56...Protrusion, 56a...Tip surface, 57...Adhesive layer, 60...Battery pack (energy storage device), 62...Case body, 63...Top surface (first bonding surface), 64...Case cover, 65...Bonding surface (second bonding surface), 66...Protrusion, 66a...Tip surface, 67...Protrusion, 67a...Tip surface, 68...Adhesive layer, 70...Battery pack (energy storage device), 71...Adhesive Layer, 80...Body structure, 81...Body, 82...Underbody (lower part), 86...Battery case (energy storage case), 88...Case joint surface, 89...Floor joint surface, 90...Protrusion, 90a...Tip surface, 92...Adhesive layer, 100...Body structure, 101...Body, 102...Underbody (lower part), 103...Floor panel, 105...Battery case (energy storage case), 107...Case joint surface, 108...Floor joint surface, 109...Protrusion, 109a...Tip surface, 110...Adhesive layer, 120...Body structure, 121...Body, 122...Underbody (lower part), 123...Floor panel, 125...Battery case (energy storage case), 127...Case joint surface, 128...Floor joint surface, 129...Protrusion, 129a...Tip surface, 130...Protrusion, 130a...Tip surface, 131...Adhesive layer

Claims

1. A case frame having a first joint surface, a case body in which an energy storage module is housed, A case cover is attached to the case body and has a second joining surface facing the first joining surface, An adhesive layer is provided between the first joining surface and the second joining surface, which joins the case body and the case cover together. It has, At least one of the first joint surface and the second joint surface is provided with a plurality of protrusions whose tip surfaces are curved. Energy storage device.

2. In the energy storage device according to claim 1, The plurality of protrusions are provided on the second joining surface. Energy storage device.

3. A floor panel located at the bottom of the vehicle body and having a floor joint surface, A power storage case having a case joint surface facing the floor joint surface, and which houses a power storage module, An adhesive layer is provided between the floor joint surface and the case joint surface, and the floor panel and the power storage case are joined together. It has, At least one of the floor joint surface and the case joint surface is provided with a plurality of protrusions whose tip surfaces are curved. Vehicle body structure.

4. In the vehicle body structure described in claim 3, The plurality of protrusions are provided on the floor joint surface. Vehicle body structure.

5. In the vehicle body structure described in claim 3, The aforementioned plurality of protrusions are provided on the case joining surface. Vehicle body structure.

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