Battery box and battery pack

Abstract

The utility model provides a battery box and battery pack, wherein the battery box comprises a box body and a reinforcer, the box body is provided with a cavity for accommodating a battery, the reinforcer is arranged at the position of the cavity, the reinforcer comprises a frame part and a reinforcing part, the frame part is connected with the box body, the reinforcing part is located in the frame part and connected with the frame part, and the frame part is connected with the reinforcing part. The reinforcing part is provided with a first surface facing the interior of the cavity and a second surface opposite to the first surface, the first surface and the second surface are each provided with a protrusion and a concave part, and the protrusions and the concave parts are located at the opposite positions of the first surface and the second surface. The battery pack box body solves the problem that the strength of the battery pack box body in the prior art is not high.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and in particular to a battery box and a battery pack. Background Art

[0002] The battery pack box has the function of carrying and protecting the battery, so the overall strength of the battery pack box is very important. The current mainstream cavity structures of the box include the grid shape (with one horizontal beam and one vertical beam in the box), the sun shape (one or more horizontal beams), and the mouth shape (without horizontal and vertical beams). However, due to the structural strength of the box itself and the large installation space brought by the above shapes, the overall strength of the box is often poor and cannot meet the requirements of carrying and protecting the battery. Utility Model Content

[0003] The main purpose of the utility model is to provide a battery box and a battery pack to solve the problem of low strength of the battery pack box in the prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a battery box, including a box body and a reinforcement, the box body having a cavity for accommodating a battery pack, the reinforcement being arranged in the cavity, the reinforcement comprising a frame portion and a reinforcement portion, the frame portion being connected to the box body, the reinforcement portion being located inside the frame portion and connected to the frame portion, the reinforcement portion having a first surface facing the inside of the cavity and a second surface opposite to the first surface, the first surface and the second surface both having protrusions and recesses, and the protrusions and recesses being located at positions opposite to the first surface and the second surface.

[0005] Furthermore, the protrusions and recesses extend along the length direction of the first surface and are alternately arranged in sequence along the width direction of the first surface, so that the cross section of the reinforcement portion perpendicular to the length direction is bent.

[0006] Furthermore, the cavity has an opening side, the reinforcement is located at the opening side, the reinforcement part is plate-shaped, and the plane where the plate is located is parallel to the surface where the opening side is located.

[0007] Furthermore, the frame portion has a polygonal structure, and two ends of the reinforcement portion are respectively connected to two corners of the polygonal structure.

[0008] Furthermore, the frame portion has a hollow area, the reinforcement portion is located in the hollow area, and divides the hollow area into a plurality of triangular chamber portions.

[0009] Furthermore, there are multiple cavities and multiple reinforcement members, and an angle is formed between the reinforcement members at two adjacent cavities.

[0010] Further, the cavity includes an edge cavity located at the edge of the box body, two adjacent edge cavities form a connection with the edge side of the box body, and the end of the reinforcement part is located at the connection.

[0011] Further, the cavities and the reinforcements are arranged in one-to-one correspondence, or at least one reinforcement is located in at least two cavities at the same time.

[0012] Further, at least one reinforcement member includes a plurality of reinforcement parts, and at least two reinforcement parts are intersectingly arranged in the same cavity.

[0013] The utility model also provides a battery pack, comprising the above-mentioned battery box and a plurality of batteries, wherein the plurality of batteries are accommodated in a cavity of the battery box.

[0014] By applying the technical solution of the utility model, a reinforcement is provided, which is beneficial to improving the overall structural strength of the box body. At the same time, the reinforcement member adopts the form of a combination of a frame part and a reinforcement part, and the reinforcement part further improves the load-bearing capacity and impact resistance of the reinforcement member by combining its protrusions and recesses. The setting method of the reinforcement part matches the stress conditions around the box body, and the connection between the reinforcement part and the frame part can also improve the strength of the reinforcement member. In this way, the above-mentioned various aspects are coordinated so that the reinforcement member installed on the box body can improve the strength and impact resistance of the battery box, so as to achieve the purpose of protecting the battery and ensure the safe, reliable and stable operation of the battery pack box. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0016] Figure 1 An exploded view of a battery pack according to the first embodiment of the present utility model is shown;

[0017] Figure 2 Shows Figure 1 Schematic diagram of the structure of the battery pack;

[0018] Figure 3 A schematic structural diagram of a reinforcement member of the first embodiment is shown;

[0019] Figure 4 Shows Figure 3 A partial enlarged view of

[0020] Figure 5 A schematic structural diagram of the bending structure of the first embodiment is shown;

[0021] Figure 6 Shows Figure 5 Cross-sectional view of the mid-bend structure;

[0022] Figure 7 A partial enlarged view of the welding point between the frame part and the box body of the first embodiment is shown;

[0023] Figure 8 A partial enlarged view of the bolt connection between the frame part and the box body of the first embodiment is shown;

[0024] Fig. 9 Shows Figure 2 A top view of the battery pack;

[0025] Fig.10 A schematic diagram of the structure of a battery box of Embodiment 2 is shown;

[0026] Fig.11 A schematic structural diagram of a battery box of Embodiment 3 is shown.

[0027] The above drawings include the following reference numerals:

[0028] 10. Box body; 20. Reinforcement member; 21. Frame portion; 22. Reinforcement portion. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0031] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0032] In order to solve the problem of low strength of a battery pack box in the prior art, the utility model provides a battery box and a battery pack.

[0033] Embodiment 1

[0034] like Figures 1 to 9 A battery box shown includes a box body 10 and a reinforcement 20. The box body 10 has a cavity for accommodating batteries. The reinforcement 20 is arranged in the cavity. The reinforcement 20 includes a frame portion 21 and a reinforcement portion 22. The frame portion 21 is connected to the box body 10. The reinforcement portion 22 is located in the frame portion 21 and connected to the frame portion 21. The reinforcement portion has a first surface facing the inside of the cavity and a second surface opposite to the first surface. Both the first surface and the second surface have protrusions and recesses, and the protrusions and recesses are located at positions opposite to the first surface and the second surface.

[0035] The present embodiment is provided with a reinforcement member 20, which is beneficial to improving the overall structural strength of the box body 10. At the same time, the reinforcement member 20 adopts the matching form of a frame portion 21 and a reinforcement portion 22, and the reinforcement portion 22 further improves the load-bearing capacity and impact resistance of the reinforcement member 20 by combining its protrusions and recesses. The setting method of the reinforcement portion 22 matches the stress conditions around the box body 10, and the connection between the reinforcement portion 22 and the frame portion 21 can also improve the strength of the reinforcement member 20. In this way, the above-mentioned various aspects cooperate so that the reinforcement member 20 installed on the box body 10 can improve the strength and impact resistance of the battery box, so as to achieve the purpose of protecting the battery and ensure the safe, reliable and stable operation of the battery pack box body 10.

[0036] In this embodiment, the protrusions and recesses extend along the length direction of the first surface, and are alternately arranged in sequence along the width direction of the first surface, so that the cross section of the reinforcing portion 22 perpendicular to the length direction is bent. In other words, the direction in which the protrusions and recesses are arranged is perpendicular to the length direction of the first surface, that is, the length direction of the reinforcing portion 22, that is, the direction in which the protrusions and recesses are arranged is the width direction of the reinforcing portion 22, and the direction of the protrusions and recesses is the thickness direction of the reinforcing portion 22, so that the reinforcing portion 22 can further enhance the structural strength. Similarly, the second surface also adopts the same setting method, and at the relative positions on both sides, the protrusions of the first surface serve as the recesses of the second surface, and the recesses of the first surface serve as the protrusions of the second surface. The reason for adopting this arrangement is that the box body 10 is generally subjected to forces on all sides. In this way, the external force will act on the reinforcing part 22 through the box body 10 roughly along the length direction of the reinforcing part 22. At this time, the protrusions or recesses arranged in the thickness direction of the reinforcing part 22 can improve the bearing capacity of the reinforcing part 22, thereby improving the structural strength, and will not increase the overall thickness of the reinforcing member 20. Even if the reinforcing part 22 is subjected to forces in other directions, it can effectively disperse and resist, thereby improving the impact resistance of the reinforcing member 20. It should be noted that the length direction and width direction mentioned in this embodiment are relative to the reinforcing part 22.

[0037] In the present embodiment, the cavity has an open side, and the battery is placed in the cavity through the open side. The reinforcement 20 is located at the open side, and the reinforcement portion 22 of the present embodiment is plate-shaped, and the plane where the plate is located is parallel to the surface where the open side is located. The reason for adopting this arrangement is that it is considered that the opening arrangement will weaken the structural strength of the box body 10, and thus the reinforcement 20 is provided at the open side to ensure the structural strength of the box body 10. Of course, the reinforcement 20 can also be provided at other positions of the box body 10. For the reinforcement 20 of the present embodiment, as mentioned above, considering that the box body 10 is generally subjected to forces on all sides, the plate-shaped reinforcement portion 22 is extended along the surface where the open side is located, thereby utilizing its own structural characteristics, and cooperating with the bending method of the reinforcement portion 22, the reinforcement portion 22 as a whole can withstand greater forces, thereby greatly improving the structural strength of the device. Figure 1 As shown, this embodiment takes the top of the cavity as the opening side as an example. At this time, the plate-shaped reinforcement part 22 is a component arranged in the horizontal direction, and the positions of its protrusions and recesses form a height difference, that is, the reinforcement part 22 has different force positions in the vertical direction. In this way, the horizontal force on the surrounding side of the box body 10 can act on the reinforcement part 22 through the frame part 21, and be shared along the length direction of the reinforcement part 22. The form of the reinforcement part 22 has a stronger ability to withstand such force, so that the overall structural strength is higher.

[0038] It should be noted that the plate-shaped reinforcing portion 22 of the present embodiment means that the reinforcing portion 22 is a plate-shaped structure as a whole, and does not mean that the upper and lower surfaces of the reinforcing portion 22 must be planes.

[0039] The bending shape of the reinforcing portion 22 of this embodiment refers to the cross section of the reinforcing portion 22, and the bending shape of this embodiment is not a standard fold line shape or arc shape, but is substantially a fold line shape. Figure 5 and Figure 6 As shown, the bending shape of the cross-section of the reinforcing portion 22 of this embodiment includes a plurality of straight segments and a plurality of bending segments. The straight segments extend laterally along the plane where the plate is located, and the bending segments bend in a direction perpendicular to the plane where the reinforcing portion 22 is located, that is, in the up and down direction. The straight segments and the bending segments are alternately arranged in sequence. Taking the reinforcing portion 22 of this embodiment as a horizontally arranged plate as an example, the overall extension direction of the straight segments and the bending segments is horizontal extension, and this direction is also perpendicular to the length direction of the reinforcing portion 22. Correspondingly, the protrusions and recesses are vertically protruding or recessed. The straight segment is a straight line, and the bending segment is a broken line or a curve. The bending segment of this embodiment adopts a curve. In this way, the straight segments and the bending segments are alternately arranged in sequence, that is, along the direction from one side of the width to the other side. Figure 6In the direction from left to right or from right to left, the straight line segment first extends horizontally for a distance, then the bent segment bends upward or downward, and then the other straight line segment continues to extend in the horizontal direction after the bend, and the so-called bend shape is formed. In order to prevent the bend segment from always bending in one direction, the present embodiment adopts a method in which the bend segment bends upward and downward alternately in the direction from left to right or from right to left, so that the straight line segment and the bend segment are always within a certain range above and below. In the above arrangement, on the one hand, the reinforcement portion 22 with a bent cross section formed by the protrusions and recesses has higher bending torsional strength and impact resistance. On the other hand, the reinforcement portion 22 is plate-shaped as a whole, and its thickness is not very large. Moreover, the surface of the reinforcement portion 22 facing the battery is a plane segment formed by the straight line segment, so that the safety of the battery can be ensured and no accidental damage to the battery will be caused.

[0040] Preferably, the reinforcement portion 22 uses DP (Dual-phase) high-strength steel, i.e., dual-phase steel, and adopts a roll-integrated hot forming process, with a material thickness of 3 to 4 mm, which is beneficial to improving the overall strength of the box body 10 .

[0041] The frame part 21 in this embodiment has a polygonal structure, and its specific shape can be adjusted accordingly according to the different shapes of the box body 10. The box body 10 in this embodiment adopts a rectangular parallelepiped, so the frame part 21 adopts a quadrilateral structure, and the frame part 21 cooperates with the side of the box body 10, and is located on the opening side and on the inner side of the box body 10, so as to support the deformation of the box body 10. The two ends of the reinforcement part 22 are respectively connected to the two corners of the polygonal structure, so that the inside of the frame part 21 is supported by the reinforcement part 22, so that the reinforcement part 22 supports the overall shape of the frame part 21, and the two cooperate to improve the structural strength.

[0042] It should be noted that the frame portion 21 can be fixed to the box body 10 by welding or bolts. Figure 7 The welding method shown in the figure has the best strength. Figure 8 The bolt connection in the embodiment is that holes are punched at the connection between the frame part 21 and the box body 10 and at the corresponding position of the box body 10 for the bolts to pass through, and the two are fixed together by bolts. This connection method is flexible and detachable, which is convenient for the disassembly and assembly of the reinforcement 20. At the same time, spot welding can be added at the bolt connection to improve the connection strength. Preferably, since a hollow area is naturally formed on the inner side of the frame part 21, and the reinforcement part 22 is located in the hollow area, this embodiment further designs the matching form between the two on the basis of the above, so that the reinforcement part 22 divides the hollow area into a plurality of triangular cavities. In this way, the structural strength of the reinforcement 20 is further enhanced by utilizing the strong stability of the triangle. Of course, cavities of other shapes can also be formed as needed.

[0043] Preferably, a minimum number of reinforcing parts 22 are used to divide the hollow area into a minimum number of triangular cavities, so as to ensure stability and reduce weight as much as possible to ensure the lightweight of the battery pack box 10. Figure 3 As shown, since the frame portion 21 of the present embodiment is a quadrilateral, the reinforcing portion 22 connects the two diagonals of the frame portion 21, dividing the hollow area into two triangular cavities. In this way, only one reinforcing portion 22 is required in each hollow area. The combination of the reinforcing portion 22 and the frame portion 21 strengthens the structural strength of the reinforcing member 20, and the triangular structure makes the reinforcing member 20 more stable and reliable.

[0044] Optionally, the number of cavities can be set accordingly as needed, and one or more cavities can be set. In this embodiment, there are multiple cavities, and similarly, there are multiple reinforcement members 20. Preferably, one reinforcement member 20 is set at each cavity, such as Figure 2 and Figure 3 As shown. In this way, the cavity, the reinforcement 20, and the reinforcement part 22 are arranged in a one-to-one correspondence, and the reinforcement part 22 of each reinforcement 20 can respectively strengthen the structural strength of a cavity. Furthermore, for two adjacent reinforcements 20, an angle is formed between the reinforcement parts 22 at two adjacent cavities, so that the inclination directions of the reinforcement parts 22 at two adjacent cavities are different, so that the forces in all directions can be transferred, dispersed, and shared by different reinforcement parts 22, which is beneficial to improve the overall structural strength. Of course, the number of cavities, reinforcements 20, and reinforcement parts 22 and their matching relationship can be adjusted accordingly as needed.

[0045] The cavity includes an edge cavity located at the edge of the box body 10, and two adjacent edge cavities form a connection with the edge side of the box body 10, and the end of the reinforcement part 22 is located at the connection. In other words, the connection is formed by the intersection of the reinforcement parts 22 of the two reinforcement members 20 and the side of the box body 10, so that the vertex connecting the polygonal structure of the reinforcement part 22 and the frame part 21 is set at the straight line segment of the edge of the box body 10, rather than the intersection of the side panels of the edge of the box body 10, so that the pressure on the side connection of the box body 10 can be directly shared by the two reinforcement parts 22, and the corner part of the box body 10 can achieve a better load-bearing effect due to its own structural form, thereby balancing the structural strength of the intersection of the side panels of the box body 10 and the inside of the box body 10, thereby further strengthening the overall structural strength.

[0046] For ease of explanation, Fig. 9For example, the two cavities on the right are respectively provided with a reinforcement part 22, and the connection formed by the two reinforcement parts 22 is located at the center of the right side of the box body 10. In this way, when the center of the right side of the box body 10 is subjected to a leftward force, the force will be shared by the two reinforcement parts 22. The force is divided into two parts and extends along the length direction of the two reinforcement parts 22, respectively, to achieve the transfer, dispersion and bearing of the force. In this embodiment, it is preferred that the two reinforcement parts 22 form an angle of 90 degrees. Of course, the specific matching relationship can also be adjusted accordingly as needed.

[0047] Optionally, the cavity distribution in the box 10 has different structural forms, such as a square-shaped structure, a grid-shaped structure, a sun-shaped structure, etc., so as to form one or more cavities. This embodiment is described by taking the cavity distributed in the square-shaped structure as an example. Of course, when the structural form of the box 10 is different or the cavity distribution is different, the arrangement of the reinforcement 20 can also be adjusted accordingly as needed, and is not limited to the method given in this embodiment. In addition to the cavity for placing batteries, the box 10 can also be provided with a cavity for placing electrical components and other devices.

[0048] like Figure 4 , 5 As shown in Figures 7 and 8, considering that the end of the reinforcing portion 22 is located at the corner of the frame portion 21, the end of the reinforcing portion 22 is configured as a pointed structure in this embodiment, that is, the end of the reinforcing portion 22 is cut to form a bevel to adapt to the shape of the corner.

[0049] This embodiment also provides a battery pack, including the above-mentioned battery box and a plurality of batteries, wherein the plurality of batteries are accommodated in a cavity of the battery box, and a reinforcement member 20 is disposed on an opening side of the cavity to improve the strength of the battery box.

[0050] Embodiment 2

[0051] What is different from the first embodiment is that the structure of the reinforcement member 20 is different.

[0052] In this embodiment, the at least one reinforcement member 20 includes a plurality of reinforcement portions 22 , and at least two reinforcement portions 22 are intersectingly disposed in the frame portion 21 .

[0053] like Fig.10As shown, the cavity of this embodiment adopts a square-shaped structure, therefore, this embodiment is only provided with one reinforcement member 20, and the one reinforcement member 20 includes a plurality of reinforcement parts 22, and the reinforcement part 22 connects two non-adjacent vertices of the frame part 21, so that each vertex is provided with a reinforcement part 22, and thus, the reinforcement parts 22 are intersected and arranged in the same cavity. Based on the box body 10 of the square-shaped structure of this embodiment, this embodiment is provided with two reinforcement parts 22, and the two reinforcement parts 22 cross to form an X-shaped structure, thereby further improving the structural strength of the reinforcement member 20, but compared with the structural form of the first embodiment, the weight of a single reinforcement member 20 is increased.

[0054] Embodiment 3

[0055] What is different from the first embodiment is that the structure of the reinforcement member 20 is different.

[0056] In this embodiment, at least one reinforcement member 20 is located in at least two cavities at the same time.

[0057] like Fig.11 As shown, the cavity of this embodiment adopts a Japanese-shaped structure, which is similar to the second embodiment. Although the box body 10 of this embodiment is a Japanese-shaped structure, the reinforcement 20 still adopts the structure of the second embodiment, and the reinforcement 20 is located in two cavities at the same time, that is, the reinforcement 20 is still provided with one, and the reinforcement 20 includes two reinforcement parts 22. The frame part 21 of the reinforcement 20 surrounds the opening sides of the two cavities at the same time, and the two reinforcement parts 22 are respectively connected to the two diagonal groups of the frame part 21 to form an X-shaped structure. In this way, the reinforcement part 22 spans the two cavities at the same time, and each cavity has a part of two reinforcement parts 22. The above structural form can also achieve the effect of improving the structural strength of the device.

[0058] It should be noted that the "multiple" in the above embodiments refers to at least two. The configurations in the above embodiments are not conflicting, and the configurations and matching of the box body 10 and the reinforcement member 20 in one or more of the above embodiments can be used in one battery box at the same time.

[0059] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0060] 1. Solve the problem of low strength of the battery pack box in the prior art;

[0061] 2. Improve the strength and impact resistance of the battery box to protect the battery;

[0062] 3. It can disperse and resist stress more effectively when subjected to external forces in different directions.

[0063] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0064] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0065] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0066] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery box, characterized in that: include: A box (10), wherein the box (10) has a cavity for accommodating a battery; A reinforcement member (20), the reinforcement member (20) being arranged at the cavity, the reinforcement member (20) comprising a frame portion (21) and a reinforcement portion (22), the frame portion (21) being connected to the box body (10), the reinforcement portion (22) being located inside the frame portion (21) and connected to the frame portion (21), the reinforcement portion (22) having a first surface facing the interior of the cavity and a second surface opposite to the first surface, the first surface and the second surface both having a protrusion and a recess, and the protrusion and the recess being located at positions opposite to the first surface and the second surface.

2. The battery box according to claim 1, characterized in that: The protrusions and the recesses extend along the length direction of the first surface and are alternately arranged in sequence along the width direction of the first surface, so that the cross section of the reinforcement portion (22) perpendicular to the length direction is bent.

3. The battery box according to claim 1, characterized in that: The cavity has an open side, the reinforcement member (20) is located at the open side, the reinforcement portion (22) is plate-shaped, and the plane where the plate is located is parallel to the surface where the open side is located.

4. The battery box according to claim 1, characterized in that: The frame portion (21) has a polygonal structure, and two ends of the reinforcement portion (22) are respectively connected to two corners of the polygonal structure.

5. The battery box according to claim 4, characterized in that: The frame portion (21) has a hollow area, and the reinforcement portion (22) is located in the hollow area and divides the hollow area into a plurality of triangular chamber portions.

6. The battery box according to claim 1, characterized in that: There are a plurality of cavities, there are a plurality of reinforcement members (20), and an angle is formed between the reinforcement members (22) at two adjacent cavities.

7. The battery box according to claim 6, characterized in that: The cavity comprises an edge cavity located at the edge of the box body (10), two adjacent edge cavities form a connection with the edge side of the box body (10), and the end of the reinforcement part (22) is located at the connection.

8. The battery box according to claim 6, characterized in that: The cavities and the reinforcement members (20) are arranged in a one-to-one correspondence, or at least one of the reinforcement members (20) is simultaneously located in at least two of the cavities.

9. The battery box according to claim 1, characterized in that: At least one of the reinforcing members (20) comprises a plurality of reinforcing portions (22), and at least two of the reinforcing portions (22) are intersectingly arranged in the same cavity.

10. A battery pack, characterized in that: It comprises a battery box as described in any one of claims 1 to 9 and a plurality of batteries, wherein the plurality of batteries are accommodated in a cavity of the battery box.

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