Battery pack

Abstract

The utility model relates to a battery pack which comprises a box body and a module frame, the box body comprises two first anti-expansion beams arranged at intervals along a first direction and two first supporting beams arranged at intervals along a second direction, a first accommodating cavity is defined by the two first anti-expansion beams and the two first supporting beams, and a lower-layer battery module is arranged in the first accommodating cavity; the module frame comprises two second anti-expansion beams arranged at intervals in the first direction and two second supporting beams arranged at intervals in the second direction, a second containing cavity is defined by the two second anti-expansion beams and the two second supporting beams, an upper-layer battery module is arranged in the second containing cavity, and the first supporting beams and the second supporting beams are connected through fasteners. According to the structure, the expansion force of the battery module can be applied to the first anti-expansion beam or the second anti-expansion beam, so that the first supporting beam and the second supporting beam are prevented from being extruded and deformed by the expansion force, and the service life of the battery pack is prolonged. The first accommodating cavity and the second accommodating cavity are synchronously provided with battery modules, so that the assembly efficiency is improved.

Description

Technical Field

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

[0002] As a power component providing clean energy, the battery pack is widely used in the field of new energy vehicles. In order to simplify the structure of the battery pack and reduce the production cost, more and more battery packs adopt the module-free design (Cell To Pack, abbreviated as "CTP"). The core of the module-free design is to directly integrate the single cells into the battery pack, thereby simplifying the structure of the battery module.

[0003] An existing battery pack includes a box body and a double-layer battery module installed in the box body. The design of the double-layer battery module is beneficial to improving the space utilization rate of the entire box body. During assembly, usually the lower-layer battery module is first installed in the box body, and then the upper-layer battery module is installed. And the upper-layer battery module is fixed to the box body through a bearing bracket. The existing battery pack has the following deficiencies: 1). Since the two-layer battery modules are successively installed into the box body, the overall assembly time of the battery pack is relatively long; 2). Since the heat dissipation effects of the two-layer battery modules are different during operation, the expansion amounts of the two-layer battery modules are different. Moreover, due to the module-free design, the expansion force of the battery module directly acts on the box body. Under the action of different expansion forces of the double-layer battery module, the box body is unevenly stressed and deformed, reducing the service life of the battery pack. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a battery pack, which can assemble the upper-layer battery module and the lower-layer battery module synchronously, with high assembly efficiency; and can avoid the expansion force of the battery module from damaging the installation position of the module frame, and improve the service life of the battery pack.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] A battery pack provided includes:

[0007] A box body, the box body includes two first anti-expansion beams spaced along a first direction and two first support beams spaced along a second direction, the first direction is perpendicular to the second direction, a first accommodation cavity is formed between the two first anti-expansion beams and the two first support beams, a lower-layer battery module is arranged in the first accommodation cavity, and the expansion direction of the lower-layer battery module is parallel to the first direction;

[0008] Module framework, the module framework is disposed within the box body and above the first accommodating cavity. The module framework includes two second anti-expansion beams spaced apart along the first direction and two second support beams spaced apart along the second direction. A second accommodating cavity is defined between the two second anti-expansion beams and the two second support beams. An upper battery module is disposed within the second accommodating cavity, and the expansion direction of the upper battery module is parallel to the first direction. The first support beam and the second support beam are connected by fasteners.

[0009] Further, the box body further includes a first bottom plate, the first anti-expansion beam and the first support beam are disposed on the first bottom plate, and the first accommodating cavity is defined between the first bottom plate, the two first anti-expansion beams and the two first support beams; and / or,

[0010] The module framework further includes a second bottom plate, the second anti-expansion beam and the second support beam are disposed on the second bottom plate, and the second accommodating cavity is defined between the second bottom plate, the two second anti-expansion beams and the two second support beams.

[0011] Further, heat dissipation channels for the coolant to flow through are provided within the first bottom plate and the second bottom plate.

[0012] Further, the module framework further includes an inlet pipe and an outlet pipe, and the heat dissipation channels of the first bottom plate and the heat dissipation channels of the second bottom plate are connected through the inlet pipe and the outlet pipe.

[0013] Further, the height dimension of the first support beam is greater than or equal to the height dimension of the first anti-expansion beam; and / or,

[0014] The height dimension of the second support beam is greater than or equal to the height dimension of the second anti-expansion beam.

[0015] Further, the second support beam includes two support rods spaced apart along its height direction. The two ends of the support rods are respectively connected to the two second anti-expansion beams, and a second mounting hole for installing the fasteners is provided on the support rod located below.

[0016] Further, there are multiple second mounting holes, and the multiple second mounting holes are spaced apart along the first direction.

[0017] Further, the cross-section of the first support beam is trapezoidal, the width of the top of the first support beam is smaller than the width of the bottom, and a first mounting hole for installing the fasteners is provided at the top of the first support beam.

[0018] Further, the upper battery module and / or the lower battery module each include a plurality of single cells stacked in sequence along the first direction, and a buffer member is interposed between two adjacent single cells.

[0019] Further, a lifting hole is provided on the second anti-expansion beam.

[0020] Advantages of the present utility model: By providing two first anti-expansion beams along the first direction and two second anti-expansion beams along the first direction, the expansion force directions of both the upper battery module and the lower battery module are parallel to the first direction, such that the expansion force of the upper battery module is applied to the second anti-expansion beam, and the expansion force of the lower battery module is applied to the first anti-expansion beam, thereby reducing the damage to the box structure and the module frame structure caused by the expansion force. By installing and connecting the first support beam and the second support beam, since the first support beam and the second support beam do not bear or bear less expansion force from the battery module, the first support beam and the second support beam will not be deformed by the extrusion of the expansion force, thereby ensuring the overall installation stability of the upper battery module and the lower battery module and enhancing the service life of the entire battery pack. At the same time, when assembling the battery pack, the upper battery module and the lower battery module can be respectively installed into the first accommodation cavity of the box bottom and the second accommodation cavity of the module frame synchronously, and then the module frame can be combined with the box bottom, which is beneficial to shortening the assembly time of the battery module and improving the overall assembly efficiency of the battery pack. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the battery pack according to an embodiment of the present utility model.

[0022] Figure 2 It is an exploded view of the battery pack according to an embodiment of the present utility model.

[0023] Figure 3 It is Figure 2 The enlarged view of A in

[0024] Figure 4 It is a schematic diagram of the upper battery module according to an embodiment of the present utility model.

[0025] Figure 5 It is an exploded view of the upper battery module according to an embodiment of the present utility model.

[0026] Figure 6 It is an installation schematic diagram of the upper battery module and the module frame according to an embodiment of the present utility model.

[0027] Figure 7 It is an exploded view of the upper battery module and the module frame according to an embodiment of the present utility model.

[0028] Figure 8Schematic diagram of the module frame according to an embodiment of the present utility model.

[0029] Figure 9 Schematic diagram of the bottom of the box according to an embodiment of the present utility model.

[0030] In the figure:

[0031] 1. Box body; 11. Bottom of the box; 110. First bottom plate; 111. First anti-expansion beam; 112. First support beam; 113. Third anti-expansion beam; 114. Third support beam; 115. Avoidance notch; 116. First mounting hole; 117. Side beam; 12. First accommodation cavity; 13. Third accommodation cavity; 14. Liquid inlet joint; 15. Liquid outlet joint; 2. Upper battery module; 21. Single cell; 22. End plate; 23. First buffer member; 24. Second buffer member; 25. CCS assembly; 26. Insulating film; 3. Lower battery module; 4. Single-layer battery module; 5. Module frame; 50. Second bottom plate; 51. Second anti-expansion beam; 52. Second support beam; 521. Support rod; 53. Liquid inlet pipe; 54. Liquid outlet pipe; 55. Lifting hole; 56. Second mounting hole. Detailed implementation manners

[0032] To make the technical problems solved by the present utility model, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the present utility model will be further described below with reference to the accompanying drawings and through specific implementation manners.

[0033] As Figure 1 and Figure 2 shown, a battery pack provided by the present utility model includes a box body 1, an upper battery module 2, a lower battery module 3 and a module frame 5. Among them, the box body 1 is used to provide mechanical protection and electrical protection for the entire battery pack. The box body 1 is a hollow structure, and the upper battery module 2, the lower battery module 3 and the module frame 5 are all installed inside the box body 1. The box body 1 as a whole presents a cuboid structure. Refer to Figure 1, the length direction of the box body 1 is the X direction shown in the figure, that is, the second direction; the width direction of the box body 1 is the Y direction shown in the figure, that is, the first direction; the height direction of the box body 1 is the Z direction shown in the figure. The box body 1 includes a box bottom 11 and a box cover (not shown in the figure). An accommodation space is formed between the box bottom 11 and the box cover so that the upper battery module 2, the lower battery module 3 and the module frame 5 can be installed in the accommodation space of the box body 1. The box body 1 includes two first anti-expansion beams 111 and two first support beams 112. The two first expansion beams 111 are arranged in parallel and spaced apart along the first direction (the Y direction shown in the figure), and the two first support beams 112 are arranged in parallel and spaced apart along the second direction (the X direction shown in the figure). The two first anti-expansion beams 111 and the two first support beams 112 are connected end to end to form a square structure, so that a first accommodation cavity 12 is formed between the two first anti-expansion beams 111 and the two first support beams 112. The lower battery module 3 is installed in the first accommodation cavity 12, and the expansion direction of the lower battery module 3 is parallel to the first direction. The module frame 5 is arranged above the first accommodation cavity 12. The module frame 5 includes two second anti-expansion beams 51 and two second support beams 52. The two second anti-expansion beams 51 are arranged in parallel and spaced apart along the first direction, and the two second support beams 52 are arranged in parallel and spaced apart along the second direction. The two second anti-expansion beams 51 and the two second support beams 52 are connected end to end to form a square structure, so that a second accommodation cavity is formed between the two second anti-expansion beams 51 and the two second support beams 52. The upper battery module 2 is installed in the second accommodation cavity, and the expansion direction of the upper battery module 2 is parallel to the first direction. The first support beam 112 and the second support beam 52 are connected by fasteners, that is, the module frame 5 is installed on the first support beam 112.

[0034] It can be understood that the first anti-expansion beam 111 and the second anti-expansion beam 51 can be of a hollow structure or a solid structure, and are made by means such as stamping and welding, having relatively high structural strength to be able to overcome the expansion force generated by the battery module. The upper battery module 2 and the lower battery module 3 will expand during the charge and discharge process. By making the expansion force directions of both the upper battery module 2 and the lower battery module 3 parallel to the first direction, the expansion force of the upper battery module 2 is applied to the second anti-expansion beam 51, and the expansion force of the lower battery module 3 is applied to the first anti-expansion beam 111, thereby reducing the damage of the expansion force to the box structure and the module frame structure. Moreover, by installing and connecting the first support beam 112 and the second support beam 52, since the first support beam 112 and the second support beam 52 do not bear the expansion force from the battery module or bear a relatively small expansion force, the first support beam 112 and the second support beam 52 will not be squeezed and deformed by the expansion force. Even in the case where the battery module operates abnormally and generates a large expansion force, it is possible to avoid the expansion force being directly applied to the first support beam 112 and the second support beam 52, resulting in the damage of the fasteners, thereby ensuring the overall installation stability of the upper battery module 2 and the lower battery module 3 and improving the service life of the entire battery pack.

[0035] Specifically, referring to Figures 4 to 7As shown in the figure, the upper battery module 2 includes single cells 21, buffer members, end plates 22, a CCS component 25, and an insulating film 26. Among them, the single cells 21 are square cells, and the thickness direction of the square cells is the Y direction shown in the figure. In practical applications, when the single cells 21 charge and discharge, they expand, and the expansion direction is the thickness direction of the single cells 21. There are multiple single cells 21, and the multiple single cells 21 are sequentially stacked along the width direction (i.e., the first direction) of the box body 1. This arrangement makes the expansion directions of all the single cells 21 parallel to the first direction. Of course, in order to improve the utilization rate of the second accommodation cavity, the single cells 21 are arranged in two rows or multiple rows. The two rows or multiple rows of single cells 21 are arranged along the length direction of the box body 1, and each row of single cells 21 has multiple single cells 21 arranged in sequence along the width direction of the box body 1. Since the single cells 21 will expand, along the width direction of the box body 1, a buffer member made of foam is provided between two adjacent single cells 21 to play an elastic buffering role. There are two end plates 22, and the two end plates 22 are arranged in parallel and spaced apart along the width direction of the box body 1 so that all the single cells 21 are clamped between the two end plates 22. The buffer member includes a first buffer member 23 and a second buffer member 24. The first buffer member 23 has a sheet-like structure, and the second buffer member 24 has a square frame structure. Along the width direction of the box body 1, a first buffer member 23 is provided between the single cell 21 at the end and the end plate 22, and a second buffer member 24 is provided between two adjacent single cells 21. The CCS (Cells Contact System) component 25 is connected to the positive and negative electrode posts of the single cells 21 and is used for voltage and temperature data acquisition, etc. The CCS component 25 is located at the top of the upper battery module 2, and the insulating film 26 is used to cover the CCS component 25 to play an insulating and protective role.

[0036] In this embodiment, compared with the traditional battery module structure, the upper battery module 2 and the lower battery module 3 eliminate structures such as the outer shell and steel belt, simplifying the manufacturing process of the battery module.

[0037] Specifically, the structure of the lower battery module 3 is the same as that of the upper battery module 2, and will not be elaborated here.

[0038] Specifically, refer to Figure 8As shown, the module frame 5 further includes a second bottom plate 50. The second anti-expansion beams 51 and the second support beams 52 surround the periphery of the second bottom plate 50, and a second accommodation cavity is formed among the second bottom plate 50, the two second anti-expansion beams 51 and the two second support beams 52. The upper battery module 2 is installed in the second accommodation cavity, and the bottom of the upper battery module 2 abuts against the second bottom plate 50. Hoisting holes 55 are provided on the second anti-expansion beams 51 to facilitate hoisting during the assembly of the battery pack using the hoisting holes 55. A heat dissipation channel for the coolant to flow through is provided in the second bottom plate 50. Usually, a liquid cooling plate is included in the battery pack to dissipate heat from the battery module. In this embodiment, by providing the heat dissipation channel in the second bottom plate 50, the liquid cooling plate and the module frame 5 are integrated into one, which is beneficial to simplifying the structure.

[0039] The second support beam 52 includes two support rods 521 spaced apart along its height direction (the Z direction shown in the figure). The two ends of the support rod 521 are respectively connected to the two second anti-expansion beams 51, and the two support rods 521 are respectively located at the two ends of the second anti-expansion beam 51 in the height direction. By setting the second support beam 52 as a structure of two support rods 521, while ensuring the support for the second anti-expansion beam 51, it is also beneficial to reduce the overall weight of the second support beam 52. At the same time, by connecting the two support rods 521 to the two ends of the second expansion beam 51 in the height direction, the second expansion beam 51 can be effectively supported throughout its height direction, thereby improving the strength of the entire module frame 5 and preventing the second expansion beam 51 from deforming due to the expansion force from the upper battery module 2. The lower support rod 521 is used for installation connection with the first support beam 112. Correspondingly, a plurality of second mounting holes 56 for passing through fasteners are provided on the lower support rod 521, and the plurality of second mounting holes 56 are spaced apart along the length direction (the Y direction shown in the figure) of the support rod 521. In this embodiment, the fasteners are bolts, screws, rivets, etc.

[0040] Specifically, referring to Figure 2 and Figure 9As shown in the figure, the box body 1 further includes a first bottom plate 110, a third anti-expansion beam 113, a third support beam 114, and a side beam 117. The side beam 117 surrounds the periphery of the first bottom plate 110, so as to form an accommodation space between the first bottom plate 110 and the side beam 117. The first anti-expansion beam 111, the first support beam 112, the third anti-expansion beam 113, and the third support beam 114 are welded and fixed on the first bottom plate 110 and are located in the accommodation space surrounded by the side beam 117. There are two third anti-expansion beams 113 and two third support beams 114. The two third anti-expansion beams 113 are arranged in parallel and at intervals along the width direction of the box body 1, and the two third support beams 114 are arranged in parallel and at intervals along the length direction of the box body 1. A first accommodation cavity 12 is formed between the first bottom plate 110, the two first anti-expansion beams 111, and the two first support beams 112. A third accommodation cavity 13 is formed between the first bottom plate 110, the two third anti-expansion beams 113, and the two third support beams 114. The structure of the third support beam 114 is similar to that of the second support beam 52, and will not be described in detail here. A single-layer battery module 4 is installed in the third accommodation cavity 13. The structure of the single-layer battery module 4 is similar to that of the upper-layer battery module 2, except that the number of single cells 21 in the two is different, and the structure of the single-layer battery module 4 will not be described in detail here. It should be noted that in practical applications, the arrangement method of the battery modules can be flexibly selected according to the internal space distribution of the box body 1 and the total number of single cells 21. For example: One arrangement method is to only set the upper-layer battery module 2 and the lower-layer battery module 3 in the box body 1, and the upper-layer battery module 2 and the lower-layer battery module 3 are stacked vertically to form a double-layer battery module structure; Another arrangement method is to set the upper-layer battery module 2, the lower-layer battery module 3, and the single-layer battery module 4 in the box body 1. The upper-layer battery module 2 and the lower-layer battery module 3 are stacked vertically to form a double-layer battery module structure. The single-layer battery module 4 and the lower-layer battery module 3 are arranged horizontally.

[0041] A heat dissipation channel for the coolant to flow through is provided in the first bottom plate 110. Usually, a liquid cooling plate is included in the battery pack, and the liquid cooling plate is used to dissipate heat from the battery module. In this embodiment, by providing a heat dissipation channel in the first bottom plate 110, the liquid cooling plate and the box body 1 are integrated, which is beneficial to simplifying the structure. During the operation of the battery pack, the first bottom plate 110 dissipates heat from the lower-layer battery module 3 and the single-layer battery module 4.

[0042] Specifically, the height dimension of the first support beam 112 is greater than or equal to the height dimension of the first anti-expansion beam 111. It can be understood that the bottom of the first anti-expansion beam 111 is fixedly welded to the first bottom plate 110, and the bending resistance at the top of the first anti-expansion beam 111 is relatively weak. By making the height of the first support beam 112 greater than or equal to that of the first anti-expansion beam 111, the connection area between the first support beam 112 and the first anti-expansion beam 111 can cover the entire first anti-expansion beam 111 in the height direction of the box body 1, thereby improving the overall bending resistance of the first anti-expansion beam 111. Similarly, the height dimension of the second support beam 52 is greater than or equal to the height dimension of the second anti-expansion beam 51. And, the height dimension of the third support beam 114 is greater than or equal to the height dimension of the third anti-expansion beam 113.

[0043] Specifically, referring to Figure 3 As shown, the cross-section of the first support beam 112 is trapezoidal. The width of the top of the first support beam 112 is B1, and the width of the bottom of the first support beam 112 is B2, and B1 < B2. Since the first support beam 112 needs to bear the overall weight of the upper battery module 2 and the module frame 5, the first support beam 112 must have sufficient strength. The first support beam 112 is arranged in a trapezoidal structure, and there are multiple cavities inside it. On the one hand, it is beneficial to improve the mechanical properties of the first support beam 112, and on the other hand, it can also reduce the self-weight of the first support beam 112. Multiple first mounting holes 116 for installing fasteners are provided at the top of the first support beam 112, and the multiple first mounting holes 116 are spaced along the length direction (the Y direction shown in the figure) of the first support beam 112. The first mounting holes 116 on the first support beam 112 correspond one-to-one with the second mounting holes 56 on the second support beam 52.

[0044] Specifically, referring to Figure 1 、 Figure 8 and Figure 9As shown, the module frame 5 further includes a liquid inlet pipe 53 and a liquid outlet pipe 54, which are respectively used for inputting and outputting the coolant to and from the second bottom plate 50. The box body 1 further includes a liquid inlet joint 14 and a liquid outlet joint 15, which are respectively used for inputting and outputting the coolant to and from the first bottom plate 110. The liquid inlet joint 14 and the liquid outlet joint 15 are connected to the first bottom plate 110 and communicate the liquid inlet joint 14 and the liquid outlet joint 15 with the heat dissipation channels inside the first bottom plate 110. One end of the liquid inlet pipe 53 communicates with the heat dissipation channel of the first bottom plate 110, and the other end communicates with the inlet end of the heat dissipation channel of the second bottom plate 50; one end of the liquid outlet pipe 54 communicates with the heat dissipation channel of the first bottom plate 110, and the other end communicates with the outlet end of the heat dissipation channel of the second bottom plate 50. This structure enables the entire battery pack to only have one liquid inlet joint 14 and one liquid outlet joint 15, which can achieve the coolant flowing through the first bottom plate 110 and the second bottom plate 50, facilitating the simplification of the overall structure.

[0045] Correspondingly, in order to accommodate the installation of the liquid inlet pipe 53 and the liquid outlet pipe 54, an avoidance notch 115 for avoiding the liquid inlet pipe 53 and the liquid outlet pipe 54 is provided on one of the first support beams 112.

[0046] Continue to refer to Figure 1 and Figure 2 As shown, in this embodiment, the box body 1 includes a box bottom 11 and a box cover. The first bottom plate 110, the first anti-expansion beam 111, the first support beam 112, the third anti-expansion beam 113, the third support beam 114 and the side beam 117 form the box bottom 11. Of course, in order to improve the overall strength of the box bottom 11, reinforcing ribs can also be provided at appropriate positions. A plurality of connection holes for passing through fasteners are spacedly arranged on the top surface of the side beam 117, and the box cover is covered on the box bottom 11, and the two are fixedly connected by fasteners.

[0047] In this embodiment, the assembly method of the battery pack is as follows: First step, weld and fabricate the box bottom 11, the box cover and the module frame 5 respectively. Second step, synchronously install the upper battery module 2, the lower battery module 3 and the single-layer battery module 4. Install the upper battery module 2 in the second accommodation cavity of the module frame 5, install the lower battery module 3 in the first accommodation cavity 12 of the box bottom 11, and install the single-layer battery module 4 in the third accommodation cavity 13 of the box bottom 11. Third step, hoist the module frame 5 and install the module frame 5 on the first support beam 112 through fasteners. Fourth step, after installing other electronic devices, connect and fix the box cover and the box bottom 11 through fasteners.

[0048] Remarkable effects of this embodiment: By arranging two first anti-expansion beams 111 along the first direction and two second anti-expansion beams 51 along the first direction, the expansion force directions of the upper battery module 2 and the lower battery module 3 are both parallel to the first direction, so that the expansion force of the upper battery module 2 is applied to the second anti-expansion beam 51, and the expansion force of the lower battery module 3 is applied to the first anti-expansion beam 111, thereby reducing the damage of the expansion force to the box structure and the module frame structure. By installing and connecting the first support beam 112 and the second support beam 52, since the first support beam 112 and the second support beam 52 do not bear the expansion force from the battery module or bear a relatively small expansion force, the first support beam 112 and the second support beam 52 will not be deformed by the extrusion of the expansion force, thereby ensuring the overall installation stability of the upper battery module 2 and the lower battery module 3 and improving the service life of the entire battery pack. At the same time, when assembling the battery pack, the upper battery module 2 and the lower battery module 3 can be respectively installed into the first accommodation cavity 12 of the box bottom 11 and the second accommodation cavity of the module frame 5 synchronously, and then the module frame 5 can be combined with the box bottom 11, which is beneficial to shortening the assembly time of the battery module and improving the overall assembly efficiency of the battery pack.

[0049] The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A battery pack, characterized in that: include: A box body, the box body comprising two first anti-expansion beams spaced apart along a first direction and two first support beams spaced apart along a second direction, the first direction being perpendicular to the second direction, a first accommodating cavity being formed between the two first anti-expansion beams and the two first support beams, a lower battery module being arranged in the first accommodating cavity, and an expansion direction of the lower battery module being parallel to the first direction; A module frame, wherein the module frame is arranged in the box body and is located above the first accommodating cavity, the module frame includes two second anti-expansion beams arranged at intervals along the first direction and two second support beams arranged at intervals along the second direction, and a second accommodating cavity is surrounded by the two second anti-expansion beams and the two second support beams, an upper battery module is arranged in the second accommodating cavity, and the expansion direction of the upper battery module is parallel to the first direction, and the first support beam and the second support beam are connected by fasteners.

2. The battery pack according to claim 1, characterized in that: The box body further includes a first bottom plate, the first anti-expansion beam and the first support beam are arranged on the first bottom plate, and the first accommodating cavity is surrounded by the first bottom plate, the two first anti-expansion beams and the two first support beams; and / or, The module frame also includes a second bottom plate, the second anti-expansion beam and the second support beam are arranged on the second bottom plate, and the second accommodating cavity is surrounded by the second bottom plate, two second anti-expansion beams and two second support beams.

3. The battery pack according to claim 2, characterized in that: The first bottom plate and the second bottom plate are provided with heat dissipation channels for cooling liquid to flow.

4. The battery pack according to claim 3, characterized in that: The module frame also includes a liquid inlet pipe and a liquid outlet pipe, the inlet end of the heat dissipation channel of the second base plate is connected to the heat dissipation channel of the first base plate through the liquid inlet pipe, and the outlet end of the heat dissipation channel of the second base plate is connected to the heat dissipation channel of the first base plate through the liquid outlet pipe.

5. The battery pack according to claim 1, characterized in that: The height dimension of the first support beam is greater than or equal to the height dimension of the first anti-expansion beam; and\or, The height dimension of the second support beam is greater than or equal to the height dimension of the second anti-expansion beam.

6. The battery pack according to claim 5, characterized in that: The second support beam includes two support rods spaced apart along its height direction, both ends of the support rods are respectively connected to the two second anti-expansion beams, and a second mounting hole for mounting the fastener is provided on the lower support rod.

7. The battery pack according to claim 6, characterized in that: There are a plurality of the second mounting holes, and the plurality of the second mounting holes are distributed at intervals along the first direction.

8. The battery pack according to claim 1, characterized in that: The cross section of the first support beam is trapezoidal, the width of the top of the first support beam is smaller than the width of the bottom, and the top of the first support beam is provided with a first mounting hole for mounting the fastener.

9. The battery pack according to any one of claims 1 to 8, characterized in that: The upper battery module and / or the lower battery module each include a plurality of single cells stacked in sequence along the first direction, and a buffer is sandwiched between two adjacent single cells.

10. The battery pack according to any one of claims 1 to 8, characterized in that: The second anti-expansion beam is provided with a hoisting hole.

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