Box body structure and battery pack

Abstract

The utility model belongs to the technical field of battery structures, and discloses a box body structure and a battery pack. The box body structure comprises a first accommodating part and a second accommodating part, the first accommodating part is used for accommodating a high-voltage box and a battery management system, the second accommodating part is used for accommodating single batteries, the first accommodating part is provided with a first connecting structure, and the second accommodating part is provided with a first connecting structure and a second connecting structure. And one second accommodating piece can be fixedly connected with one first accommodating piece or the other second accommodating piece. The battery pack is assembled by adopting the box body structure, and the first accommodating piece can be connected with one or more second accommodating pieces by utilizing the first connecting structure and the second connecting structure, so that the battery pack which can meet the requirements of different vehicles and has different performances is formed at lower design cost and production cost; platformization and systematization design is realized.

Description

Technical Field

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

[0002] The battery pack is an important component of new energy vehicles. As the power source of new energy vehicles, it contains multiple battery cells. Multiple battery cells are assembled into a battery module, and then multiple battery modules are assembled with high-voltage boxes and battery management systems to form a battery pack, thereby providing power for new energy vehicles.

[0003] However, existing battery packs cannot meet the power requirements of a variety of different vehicles, so different battery packs need to be designed for different vehicles during the production process, which greatly increases the design cost. In addition, the existing battery packs have a complex structure and many parts, which not only makes the battery pack heavier, but also reduces production efficiency and increases production costs.

[0004] Based on the above, a box structure and a battery pack are urgently needed to solve the above technical problems. Utility Model Content

[0005] The purpose of the utility model is to provide a box structure and a battery pack, which can meet the power requirements of different vehicles with a lower design cost and have lower weight and cost.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A box structure, the box structure includes a first receiving piece and a second receiving piece, the first receiving piece is used to receive a high-voltage box and a battery management system, the second receiving piece is used to receive a battery cell, and,

[0008] The first receiving piece has a first connection structure, and the second receiving piece has the first connection structure and the second connection structure. Through the first connection structure and the second connection structure, one of the second receiving pieces can be fixedly connected to one of the first receiving pieces or another of the second receiving pieces.

[0009] Preferably, the first connection structure includes one of a recessed portion and a raised portion, and the second connection structure includes the other of the recessed portion and the raised portion, and the raised portion can be inserted into or abutted against the recessed portion in a limited position; and / or,

[0010] The first connection structure includes a first hole, the second connection structure includes a second hole, and the box structure further includes a fastener, which can be inserted into the first hole and the second hole to fix one of the second receiving pieces with one of the first receiving pieces or another of the second receiving pieces; and / or,

[0011] The first connection structure includes a first welding portion, the second connection structure includes a second welding portion, and the first welding portion and the second welding portion can be welded and connected; and / or,

[0012] The first connection structure includes a first adhesive connection portion, the second connection structure includes a second adhesive connection portion, and the first adhesive connection portion and the second adhesive connection portion can be adhesively connected; and / or,

[0013] The first connection structure includes a first clamping portion, and the second connection structure includes a second clamping portion. The first clamping portion and the second clamping portion can form a snap connection.

[0014] Preferably, the first connection structure includes the recessed portion, and includes at least one of the first hole, the first welding portion, the first adhesive portion, and the first clamping portion;

[0015] The second connection structure includes the protruding portion, and correspondingly includes at least one of the second hole, the second welding portion, the second adhesive portion, and the second clamping portion.

[0016] Preferably, at least two of the second receiving members are arranged and connected via the first connecting structure and the second connecting structure.

[0017] Preferably, the box structure further includes a structural reinforcement member, and the structural reinforcement member is fixedly connected to the first receiving member and / or the second receiving member to correspondingly strengthen the structural strength of the box structure.

[0018] Preferably, the first receiving member and the second receiving member are arranged in a preset first direction, the second receiving member has a first side wall and a second side wall arranged opposite to each other, the first side wall is provided with the second connecting structure, the second side wall is provided with the first connecting structure, a third side wall and a fourth side wall are further connected between the first side wall and the second side wall, the battery cell can be limitedly arranged between the first side wall, the second side wall, the third side wall and the fourth side wall, and,

[0019] The wall thickness of the third side wall and the fourth side wall is greater than that of the first side wall and the second side wall, and the structural reinforcement is provided with a third connecting structure. Through the third connecting structure and the first connecting structure, the structural reinforcement can be fixedly connected to one of the second side walls that is not connected to the second connecting structure.

[0020] Preferably, the first receiving piece and / or the second receiving piece is further provided with a fixing ear, and the fixing ear is used to connect a fastener to fix the first receiving piece and / or the second receiving piece accordingly.

[0021] A battery pack comprises the above-mentioned box structure, wherein a high voltage box and a battery management system are arranged in a first receiving piece in the box structure, and a plurality of battery cells are arranged in a second receiving piece in the box structure.

[0022] Preferably, the first receiving member and / or the second receiving member is a box-shaped member with one end open, and when the battery pack is disposed in a vehicle, all of the box-shaped members are fixedly disposed in the vehicle with the openings facing upward.

[0023] Preferably, the box structure further comprises a box cover, which can be fixedly arranged at the opening of the box-shaped member to seal the box-shaped member; or, the opening of the box-shaped member is sealed and connected to the vehicle body floor; and / or,

[0024] The battery pack includes at least two adjacent box-shaped members, and a sealing member is provided between the two adjacent box-shaped members, and the sealing member is used to prevent liquid from spreading from bottom to top between the two box-shaped members.

[0025] The beneficial effects of the present invention are as follows: by adopting the above-mentioned box structure to assemble the battery pack, the first receiving component can be connected to one or more second receiving components by utilizing the first connecting structure and the second connecting structure, thereby forming a battery pack with different performances that can meet the needs of different vehicles at a lower design cost and production cost, thereby realizing a platform-based and systematized design. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural diagram of a battery pack in the first embodiment provided by the utility model;

[0027] Figure 2 It is a schematic diagram of the assembly of the battery pack in the first embodiment provided by the utility model;

[0028] Figure 3 It is a schematic diagram of the assembly of a battery pack in the second embodiment provided by the utility model;

[0029] Figure 4 It is an exploded view of the second module provided by the utility model;

[0030] Figure 5 It is a structural schematic diagram of the second receiving member provided by the utility model;

[0031] Figure 6It is a sealing schematic diagram of a battery pack in the second embodiment provided by the utility model.

[0032] In the figure:

[0033] 1. First module; 11. First receiving component; 12. High voltage box; 13. Battery management system; 14. Battery high and low voltage interface;

[0034] 2. Second module; 21. Second receiving member; 22. Battery cell;

[0035] 3. Structural reinforcements;

[0036] 4. Fasteners;

[0037] 5. Seals;

[0038] 10. first side wall; 20. second side wall; 30. third side wall; 40. fourth side wall;

[0039] 1001, recessed portion; 1002, first hole;

[0040] 2001, raised portion; 2002, second hole;

[0041] 300, fixing ear; 3001, fixing hole;

[0042] 400. Sealing groove. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0044] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", "fixed", and "abutted" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0046] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0047] The following is based on the attached Figure 1 To Attachment Figure 6 The box structure and battery pack provided by the utility model are introduced.

[0048] like Figure 1 As shown, in this embodiment, the box structure includes a first receiving piece 11 and a second receiving piece 21, the first receiving piece 11 has a first connecting structure, and the second receiving piece 21 has a first connecting structure and a second connecting structure. Through the first connecting structure and the second connecting structure, a second receiving piece 21 can be fixedly connected to a first receiving piece 11 or another second receiving piece 21, thereby forming a box structure.

[0049] For example, in the first embodiment provided by the present utility model, the box structure is used as a structural component of the battery pack. Figure 1 As shown, the box structure includes a first receiving component 11 and five second receiving components 21. The first receiving component 11 is used to accommodate the high-voltage box 12 and the battery management system 13, and the second receiving component 21 is used to accommodate the battery cell 22. The high-voltage box 12 and the battery management system 13 are control modules of the battery cell 22. The side wall of the first receiving component 11 is provided with a battery high and low voltage interface 14. The battery cell 22 is connected to the high-voltage box 12 and the battery management system 13 through a connecting line. The high-voltage box 12, the battery management system 13 and the battery high and low voltage interface 14 are connected through a connecting line, so that the electric energy is output through the battery high and low voltage interface 14 under the control of the high-voltage box 12 and the battery management system 13.

[0050] In the battery pack, by adopting the above-mentioned box structure and utilizing the first connecting structure and the second connecting structure, the first receiving component 11 can be connected to one or more second receiving components 21, thereby forming a battery pack with different performances that can meet the needs of different vehicles at a lower design cost and production cost, thereby realizing a platform-based and systematic design.

[0051] Optionally, in the box structure, multiple battery cells 22 are arranged in a module-free manner in the second receiving member 21, eliminating the process steps of assembling a battery module, which can greatly reduce the number of components of the battery pack, achieve weight and cost reduction, and improve the production and assembly efficiency of the battery pack.

[0052] Specifically, a connecting line is formed between the battery cell 22 and the high-voltage box 12 and the battery management system 13 to electrically connect the battery cell 22 and the high-voltage box 12 and the battery management system 13. When a first number of second receiving components 21 and a second number of second receiving components 21 are respectively provided in the battery pack, the connecting line enables the battery pack to output a first voltage and a second voltage correspondingly. Moreover, when the value of the second number is greater than the value of the first number, the value of the second voltage may also be greater than the value of the first voltage. At this point, the designer can reasonably set the number of second receiving components 21 in the battery pack according to the vehicle's requirements for the output voltage of the battery pack, and increase the output voltage by setting a series wiring between the two second receiving components 21 to match the vehicle's requirements.

[0053] For example, Figure 2 As shown, in the first embodiment provided by the present utility model, the five second receiving members 21 are connected in series to form the above-mentioned connection line, so that the battery pack can output a higher voltage to meet the power requirements of, for example, a BEV model. Figure 3 As shown, in the second embodiment provided by the present invention, the battery pack includes two second receiving members 21, and the two second receiving members 21 are connected in series to form the above-mentioned connection line, so that the battery pack can output a lower voltage to match the power requirements of, for example, PHEV models. Of course, in some embodiments, the output performance (including voltage, current, etc.) of the battery pack can also be further adjusted by replacing battery cells 22 with different performances. This is not specifically limited in the present invention. As long as the battery pack can change the output performance of the battery pack by adjusting the number of second receiving members 21, it falls within the scope of protection of the present invention.

[0054] Continue to refer Figures 2 to 4 As shown, in the two embodiments provided by the present invention, the first receiving member 11 and the second receiving member 21 are both arranged along a preset first direction (such as Figure 2The first connection structure includes a plurality of first holes 1002, the second connection structure includes a plurality of second holes 2002, and the battery pack further includes fasteners 4 such as bolts, which can be correspondingly inserted into the first holes 1002 and the second holes 2002 to fix a second receiving member 21 with a first receiving member 11 or another second receiving member 21.

[0055] Furthermore, if Figures 2 to 4 As shown, the first connection structure also includes one of the recessed portion 1001 and the raised portion 2001, and the second connection structure also includes the other of the recessed portion 1001 and the raised portion 2001. The raised portion 2001 can be inserted into or abut against the recessed portion 1001 to limit the connection between the first receiving component 11 and the second receiving component 21, and between the second receiving component 21 and the second receiving component 21. The recessed portion 1001 and the raised portion 2001 can play a role of pre-fixation before connection by the fastener 4, reduce the difficulty of assembly, improve the efficiency of assembly, and play an effect of strengthening the structural strength of the battery pack after the fastener 4 is installed. Preferably, along the preset second direction (the preset second direction is perpendicular to the above-mentioned preset first direction, such as Figure 2 As shown in the middle Y-axis, the first connection structure includes two recessed portions 1001 disposed at intervals, and the second connection structure includes two raised portions 2001 disposed at intervals. The raised portions 2001 can be correspondingly inserted into the recessed portions 1001, which can not only further optimize the pre-fixing effect during assembly, but also further enhance the structural strength of the battery pack after assembly.

[0056] Optionally, in some other embodiments, at least one method such as clamping, welding, and gluing can be used to pre-fix or fix the first receiving piece 11 and the second receiving piece 21, and the second receiving piece 21 and the second receiving piece 21. Exemplarily, in some embodiments, the first connection structure includes a first welding portion, and the second connection structure includes a second welding portion, and the first welding portion and the second welding portion can be welded to achieve the effect of fixed connection or pre-fixed and fixed connection. Alternatively, the first connection structure includes a first gluing portion, and the second connection structure includes a second gluing portion, and the first gluing portion and the second gluing portion can be glued to achieve the effect of fixed connection or pre-fixed and fixed connection. Alternatively, the first connection structure includes a first clamping portion, and the second connection structure includes a second clamping portion, and the first clamping portion and the second clamping portion can form a snap connection to achieve the effect of fixed connection or pre-fixed and fixed connection.

[0057] It can be understood that, according to actual installation or assembly requirements, at least one of the above-mentioned plug-in connection, fastener 4 connection, snap connection, welding connection, and adhesive connection can be used to achieve the limitation or fixation between the first receiving component 11 and the second receiving component 21, and between the second receiving component 21 and the second receiving component 21. Therefore, the utility model does not make specific limitations on the first connection structure and the second connection structure, nor does it make specific limitations on the number of second receiving components 21 in the box structure.

[0058] like Figure 4 , Figure 5 As shown, a fixing ear 300 is protruding from the side of the first receiving piece 11 or the second receiving piece 21, and the fixing ear 300 is provided with a fixing hole 3001. The fastener 4 can pass through the fixing hole 3001 and be connected to the vehicle to fix the first receiving piece 11 or the second receiving piece 21 to the vehicle accordingly. The setting method of the fixing ear 300 is not easy to damage the sealing of the first receiving piece 11 or the second receiving piece 21, and is easy to manufacture, thereby reducing the sealing difficulty and manufacturing difficulty of the first receiving piece 11 and the second receiving piece 21. Preferably, the first receiving piece 11 and the second receiving piece 21 are both provided with a fixing ear 300 to improve the stability of the box structure installed in the vehicle.

[0059] Optionally, in some other embodiments, a fixing hole 3001 may be directly provided on the bottom wall or side wall of the first receiving member 11 or the second receiving member 21, and the fastener 4 may pass through the fixing hole 3001 and be connected to the vehicle to fix the box structure to the vehicle. This method can also fix the box structure in the vehicle, and is also within the scope of protection of the utility model.

[0060] like Figure 2 , Figure 3 As shown, at least two second receiving members 21 are connected in arrangement through a first connection structure and a second connection structure, and a structural reinforcement member 3 is also provided at the head end or the tail end of the arrangement direction. The structural reinforcement member 3 can be fixedly connected to the first receiving member 11 or the second receiving member 21, thereby correspondingly strengthening the structural strength of the box structure.

[0061] Specifically, Figure 3 , Figure 4As shown, the first receiving member 11 and the second receiving member 21 are arranged in a preset first direction, the second receiving member 21 has a first side wall 10 and a second side wall 20 arranged opposite to each other, the first side wall 10 is provided with a second connection structure, the second side wall 20 is provided with a first connection structure, the first side wall 10 and the second side wall 20 are further connected with a third side wall 30 and a fourth side wall 40, and the battery cell 22 is limited and arranged between the first side wall 10, the second side wall 20, the third side wall 30 and the fourth side wall 40. In addition, the wall thickness of the third side wall 30 and the fourth side wall 40 is greater than the wall thickness of the first side wall 10 and the second side wall 20, so as to ensure the limiting ability of the battery cell 22 of the box structure along the preset second direction and reduce the weight. The structural reinforcement member 3 is provided with a third connection structure, and through the third connection structure and the first connection structure, the structural reinforcement member 3 can be fixedly connected to a second side wall 20 not connected with the second connection structure, so as to enhance the limiting ability of the battery cell 22 along the preset first direction and enhance the structural strength of the entire box structure.

[0062] More specifically, the third connection structure includes a protrusion 2001, and the protrusion 2001 is provided with a second hole 2002, the second side wall 20 is provided with a recessed portion 1001, and the outer side wall of the recessed portion 1001 is provided with a first hole 1002, the protrusion 2001 can be inserted into the recessed portion 1001, and the first hole 1002 is aligned with the second hole 2002. The fastener 4 can pass through the first hole 1002 and connect to the second hole 2002, so as to fix the tail beam to the second side wall 20.

[0063] Of course, in some other embodiments, the third connection structure may also be a welding portion, an adhesive portion, a clamping structure, etc., and the present invention does not impose any specific restrictions on this. In this embodiment, the structural reinforcement member 3 adopts a tail beam and is installed on the second receiving member 21, while in some other embodiments, the structural reinforcement member 3 may also adopt a square frame, so that the first receiving member 11 can be installed and the battery high and low voltage interfaces 14 can be avoided.

[0064] The utility model also provides a battery pack, which includes a first module 1 and a plurality of second modules 2. The first module 1 includes a first receiving piece 11, a high-voltage box 12 and a battery management system 13, and the high-voltage box 12 and the battery management system 13 are fixedly arranged in the first receiving piece 11. The second module 2 includes a second receiving piece 21 and a plurality of battery cells 22, and the plurality of battery cells 22 are arranged in the second receiving piece 21. The side wall of the first receiving piece 11 is installed with a battery high and low voltage interface 14, and the battery cell 22 can be electrically connected to the high-voltage box 12, the battery management system 13 and the battery high and low voltage interface 14, so that the electric energy is output through the battery high and low voltage interface 14 under the control of the high-voltage box 12 and the battery management system 13.

[0065] like Figures 3 to 5 As shown, the first receiving member 11 and the second receiving member 21 are box-shaped members with one end open, and when the battery pack is set in the vehicle, all the box-shaped members are fixedly set in the vehicle with the opening facing upward, so as to reduce the possibility of water entering the first receiving member 11 and the second receiving member 21 when driving in wading or other conditions. Of course, in some other embodiments, the installation method with the opening facing the side can also be adopted, as long as the above-mentioned first connection structure and second connection structure can be set to achieve fixed connection between the first module 1 and the second module 2, and between the second module 2 and the second module 2, it belongs to the scope of protection of the utility model.

[0066] Optionally, in some embodiments, the first module 1 or the second module 2 further includes a box cover, which can be fixedly arranged at the opening of the box-shaped member to seal the box-shaped member, thereby further preventing water from entering. Preferably, in this embodiment, the opening of the box-shaped member is sealed and connected to the vehicle's body floor, so that the body floor is used as a "box cover", which can not only seal the box-shaped member and prevent water from entering, but also reduce the number of components and the overall weight of the battery pack, reduce the structural cost and assembly cost, and reduce the installation size required for the entire battery pack, so as to reduce the design difficulty of the battery pack and the vehicle. Of course, in some other embodiments, box covers can also be provided in both the first module 1 and the second module 2, and the first receiving member 11 and the second receiving member 21 can be sealed accordingly.

[0067] like Figure 4 , Figure 6 As shown, a seal 5 is provided between two adjacent box-like members, and the seal 5 is used to prevent liquid from spreading from bottom to top between the two box-like members and entering the box-like members from the opening at the top, thereby avoiding water ingress.

[0068] Specifically, the first receiving piece 11 and the second receiving piece 21 are arranged in a preset first direction, the first side wall 10 or the second side wall 20 is provided with a sealing groove 400, and the sealing piece 5 is a sealing ring or a sealing strip, and is limitedly set in the sealing groove 400, so as to seal between the first receiving piece 11 and the second receiving piece 21, and between the second receiving piece 21 and the second receiving piece 21. Of course, in some embodiments, the sealing groove 400 can also be provided on the side wall of the first receiving piece 11, or the sealing groove 400 can be provided on both the first side wall 10 and the second side wall 20, which also fall within the scope of protection of the present utility model.

[0069] Preferably, the sealing member 5 includes a soft rubber strip formed by solidifying a foam sealant. When assembling the battery pack, a glue gun is used to fill the liquid foam sealant into the sealing groove 400, and the first receiving member 11 and the second receiving member 21, and the second receiving member 21 and the second receiving member 21 are tightly attached to achieve a sealing effect. Of course, in some embodiments, the foam sealant may be solidified and formed first, and then the formed soft rubber strip may be cut and installed in the sealing groove 400, which can also achieve a sealing effect.

[0070] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Box structure, characterized in that: The box structure comprises a first receiving piece (11) and a second receiving piece (21), wherein the first receiving piece (11) is used to receive a high-voltage box (12) and a battery management system (13), and the second receiving piece (21) is used to receive a battery cell (22), and The first receiving piece (11) has a first connecting structure, and the second receiving piece (21) has the first connecting structure and the second connecting structure. Through the first connecting structure and the second connecting structure, one of the second receiving pieces (21) can be fixedly connected to one of the first receiving pieces (11) or another of the second receiving pieces (21).

2. The box structure according to claim 1, characterized in that: The first connection structure comprises one of a recessed portion (1001) and a raised portion (2001), the second connection structure comprises the other of the recessed portion (1001) and the raised portion (2001), and the raised portion (2001) can be inserted in a limited position or abutted against the recessed portion (1001); and / or, The first connection structure comprises a first hole (1002), the second connection structure comprises a second hole (2002), the box structure further comprises a fastener (4), and the fastener (4) can be inserted into the first hole (1002) and the second hole (2002) to fix one of the second receiving pieces (21) with one of the first receiving pieces (11) or another of the second receiving pieces (21); and / or, The first connection structure includes a first welding portion, the second connection structure includes a second welding portion, and the first welding portion and the second welding portion can be welded and connected; and / or, The first connection structure includes a first adhesive connection portion, the second connection structure includes a second adhesive connection portion, and the first adhesive connection portion and the second adhesive connection portion can be adhesively connected; and / or, The first connection structure includes a first clamping portion, and the second connection structure includes a second clamping portion. The first clamping portion and the second clamping portion can form a snap connection.

3. The box structure according to claim 2, characterized in that: The first connection structure comprises the recessed portion (1001), and comprises at least one of the first hole (1002), the first welding portion, the first adhesive portion and the first clamping portion; The second connection structure includes the protruding portion (2001), and correspondingly includes at least one of the second hole (2002), the second welding portion, the second adhesive portion and the second clamping portion.

4. The box structure according to claim 1, characterized in that: At least two of the second receiving members (21) are arranged and connected via the first connecting structure and the second connecting structure.

5. The box structure according to any one of claims 1 to 4, characterized in that: The box structure also includes a structural reinforcement member (3), and the structural reinforcement member (3) is fixedly connected to the first receiving member (11) and / or the second receiving member (21) to correspondingly strengthen the structural strength of the box structure.

6. The box structure according to claim 5, characterized in that: The first receiving member (11) and the second receiving member (21) are arranged in a predetermined first direction, the second receiving member (21) has a first side wall (10) and a second side wall (20) arranged opposite to each other, the first side wall (10) is provided with the second connecting structure, the second side wall (20) is provided with the first connecting structure, a third side wall (30) and a fourth side wall (40) are further connected between the first side wall (10) and the second side wall (20), the battery cell (22) can be limitedly arranged between the first side wall (10), the second side wall (20), the third side wall (30) and the fourth side wall (40), and, The wall thickness of the third side wall (30) and the fourth side wall (40) is greater than the wall thickness of the first side wall (10) and the second side wall (20), and the structural reinforcement (3) is provided with a third connecting structure, and through the third connecting structure and the first connecting structure, the structural reinforcement (3) can be fixedly connected to one of the second side walls (20) that is not connected to the second connecting structure.

7. The box structure according to claim 1, characterized in that: The first receiving piece (11) and / or the second receiving piece (21) are also provided with fixing ears (300), and the fixing ears (300) are used to connect the fasteners (4) to fix the first receiving piece (11) and / or the second receiving piece (21) in a corresponding manner.

8. A battery pack, characterized in that: It comprises a box structure as described in any one of claims 1 to 7, wherein a first receiving piece (11) in the box structure is provided with a high-voltage box (12) and a battery management system (13), and a second receiving piece (21) in the box structure is provided with a plurality of battery cells (22).

9. The battery pack according to claim 8, characterized in that: The first receiving member (11) and / or the second receiving member (21) is a box-shaped member with one end open, and when the battery pack is arranged in a vehicle, all of the box-shaped members are fixedly arranged in the vehicle in an upward direction with the openings.

10. The battery pack according to claim 9, characterized in that: The box structure further comprises a box cover, which can be fixedly arranged at the opening of the box-shaped member to seal the box-shaped member; or, the opening of the box-shaped member is sealed and connected to the vehicle body floor; and / or, The battery pack comprises at least two adjacent box-shaped members, and a sealing member (5) is arranged between the two adjacent box-shaped members, and the sealing member (5) is used to prevent liquid from spreading from bottom to top between the two box-shaped members.

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