Box body structure for double-layer battery pack and double-layer battery pack

Abstract

The utility model discloses a box body structure for the double-layer battery pack and the double-layer battery pack, the box body structure comprises a box body main body, a liquid inlet interface and a liquid outlet interface, the box body main body comprises a mounting platform which is arranged on one side in an outward convex manner, the box body main body also comprises a mounting block which is arranged below the mounting platform in an outward convex manner, and the liquid outlet interface is arranged on the mounting block. Mounting holes are formed in the mounting blocks, and the liquid inlet connector and the liquid outlet connector are both arranged below the mounting platform and fixed to the outer side wall of the box body; according to the scheme, by arranging the mounting platform, the battery control module can be fixed at a relatively high position, so that the battery control module can be conveniently and electrically connected with the double-layer battery module at the same time, in addition, the liquid inlet interface and the liquid outlet interface are hidden below the mounting platform, so that the liquid inlet interface and the liquid outlet interface do not occupy relatively much space in the X direction or the Y direction; therefore, the total electric quantity of the double-layer battery pack can be further improved in limited spaces in the X direction and the Y direction.

Description

Technical Field

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

[0002] As the energy storage and power output device of new energy vehicles, the power battery pack is the power source of new energy vehicles and the guarantee of their endurance. With the vigorous development of the new energy industry, higher requirements are put forward for the energy density and grouping efficiency of the battery pack. When the installation space of new energy vehicles in the X and Y directions is limited, in order to improve space utilization and increase the total power, the current battery pack will be equipped with a double-layer battery module arranged along the vertical Z direction in the box. However, the shape of the current traditional box is a regular rectangular structure, and the protruding liquid inlet and outlet interfaces on the outer wall of the box will occupy the space in the X or Y direction, making it impossible to further increase the power of the battery pack. Utility Model Content

[0003] The utility model aims to provide a box structure for a double-layer battery pack and a double-layer battery pack, mainly to solve the technical problem of how to further improve the total power of the double-layer battery pack.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] A box structure for a double-layer battery pack, used for installing a lower battery module and an upper battery module, comprising a box body, a liquid inlet interface and a liquid outlet interface, wherein the box body comprises a mounting platform convexly arranged outwardly toward one side along a first direction X, wherein a groove for fixing a battery control module is concavely arranged in the mounting platform, wherein the box body further comprises a mounting block extending outwardly below the mounting platform along the first direction X, wherein the mounting block is provided with a mounting hole for fixing the box structure at a preset position, wherein the liquid inlet interface and the liquid outlet interface are both arranged below the mounting platform and fixed to the outer side wall of the box body.

[0006] In one of the technical solutions, the box body is provided with a mounting groove connected to the groove on one side of the mounting platform, and the box structure also includes a liquid-cooled bottom plate and two cross beams arranged in the mounting groove, the two cross beams are arranged at intervals along the second direction Y and are located on the top of the liquid-cooled bottom plate, and a first mounting space for placing the lower battery module is formed between the two cross beams along the second direction Y, the top surface of the liquid-cooled bottom plate is used to cool the bottom surface of the lower battery module, and the two cross beams are used to fix the upper battery module located above the lower battery module, and the liquid-cooled bottom plate is respectively connected to the liquid inlet interface and the liquid outlet interface.

[0007] In one of the technical solutions, the box structure also includes a liquid-cooled top plate respectively fixed on the two cross beams, the top surface of the liquid-cooled top plate is used to cool the upper battery module, and the liquid-cooled top plate is respectively connected to the liquid inlet interface and the liquid outlet interface.

[0008] In one of the technical solutions, the liquid-cooled top plate is provided with a first liquid inlet and a first liquid outlet both facing downward, and the liquid-cooled bottom plate is provided with a second liquid inlet and a second liquid outlet both facing upward, the first liquid inlet and the second liquid inlet are respectively connected to the liquid inlet interface, and the first liquid outlet and the second liquid outlet are respectively connected to the liquid outlet interface.

[0009] In one of the technical solutions, a second installation space for accommodating a collection board is formed between the two cross beams and the side walls of the installation groove along the second direction Y, and a side of the cross beam facing away from the lower battery module is used for fixing the collection board.

[0010] The present application also provides a double-layer battery pack, comprising the box structure described above, and further comprising a lower battery module, an upper battery module and a battery control module arranged inside the box body;

[0011] The upper battery module is arranged above the lower battery module, and the battery control module is fixed in the groove of the mounting platform and is electrically connected to the lower battery module and the upper battery module respectively.

[0012] In one of the technical solutions, the double-layer battery pack also includes a first fastener and a second fastener. The first fastener passes through the upper battery module and the liquid-cooled top plate in sequence and is fixed to one of the cross beams. The second fastener passes through the upper battery module and the liquid-cooled top plate in sequence and is fixed to the other cross beam.

[0013] In one of the technical solutions, the upper battery module includes a battery module, a cable tie and two end plates;

[0014] The two end plates are arranged on opposite sides of the battery module, and the cable tie binds the battery module and the two end plates together;

[0015] The first fastener passes through one of the end plates and the liquid-cooled top plate in sequence and is fixed to one of the crossbeams;

[0016] The second fastener passes through the other end plate and the liquid-cooled top plate in sequence and is then fixed on the other crossbeam.

[0017] In one of the technical solutions, the battery control module has a conductive member extending outward, the upper battery module has a first electrode extending therefrom, a first support seat is fixed on the end plate, and the first electrode is electrically connected to the conductive member and both are fixed on the first support seat;

[0018] A second electrode extends from the lower battery module, a through hole is provided on the side of the crossbeam and runs transversely therethrough, a second support seat is fixed at the through hole, and the second electrode is electrically connected to the conductive member and both are fixed on the second support seat.

[0019] In one of the technical solutions, the double-layer battery pack further includes a master control acquisition board and two slave control acquisition boards;

[0020] One of the slave control acquisition boards is located in the second installation space on one side of the crossbeam and is electrically connected to the lower battery module;

[0021] Another slave control acquisition board is located in the second installation space on one side of another crossbeam and is electrically connected to the upper battery module;

[0022] The main control acquisition board is located in one of the second installation spaces;

[0023] The two slave control acquisition boards are electrically connected to the master control acquisition board respectively, and the battery control module is electrically connected to the master control acquisition board;

[0024] The cross beam is provided with a protrusion protruding toward the second installation space, and the slave control acquisition board is overlapped on the top surface of the protrusion and fixedly connected to the protrusion.

[0025] Compared with the prior art, the box structure for the double-layer battery pack provided by the utility model has at least the following beneficial effects:

[0026] By setting up a mounting platform, this solution can fix the battery control module at a higher position, so as to facilitate electrical connection with the upper battery module and the lower battery module at the same time. In addition, this solution hides the liquid inlet interface and the liquid outlet interface under the mounting platform, so that the liquid inlet interface and the liquid outlet interface do not occupy much space in the horizontal X direction or the horizontal Y direction, which is conducive to further increasing the total power of the double-layer battery pack within the space limited in the X direction and the Y direction, and meeting the demand for high endurance of new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the structure of a double-layer battery pack provided in an embodiment of the present application;

[0029] Figure 2 A schematic diagram of the structure of a double-layer battery pack provided in an embodiment of the present application at another angle;

[0030] Figure 3 A schematic diagram of the structure of the double-layer battery pack provided in an embodiment of the present application after the box body is hidden;

[0031] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0032] Figure 5 for Figure 3 The schematic diagram of the structure of the battery pack shown is from another angle;

[0033] Figure 6 for Figure 5 A partial enlarged view of point B in the middle;

[0034] Figure 7 for Figure 5 An exploded view of the battery pack shown;

[0035] Figure 8 A schematic diagram of the structure of the box provided in an embodiment of the present application.

[0036] Among them, the reference numerals in the figure are:

[0037] 100. Box structure; 1. Box body; 11. Mounting slot; 12. Mounting platform; 121. Groove; 13. Mounting block; 131. Mounting hole; 2. Lower battery module; 3. Upper battery module; 31. Battery module; 32. Cable tie; 33. End plate; 34. First support seat; 4. Liquid-cooled bottom plate; 41. Second liquid inlet; 42. Second liquid outlet; 5. Liquid-cooled top plate; 51. First liquid inlet; 52. First liquid outlet; 6. Crossbeam; 61. Through hole; 62. Bump; 7. First fastener; 8. Second fastener; 9. Battery control module; 10. Second support seat; 20. Liquid inlet interface; 30. Liquid outlet interface; 40. Main control acquisition board; 50. Slave control acquisition board; 60. First installation space; 70. Second installation space. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0040] It should be understood that the orientations or positional relationships indicated by terms such as "upper", "lower", "top", "bottom", "inside", and "outside" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0043] Please also read Figures 1 to 3 , Figure 5 , Figure 7 and Figure 8 The present embodiment provides a double-layer battery pack, which mainly includes a box structure 100, a lower battery module 2, an upper battery module 3 and a battery control module 9 (also referred to as BDU in the art), wherein the lower battery module 2 and the upper battery module 3 are understood to include a plurality of battery cells connected in series or in parallel, and the lower battery module 2 is located below the upper battery module 3, wherein the battery control module 9 is electrically connected to the lower battery module 2 and the upper battery module 3, respectively, to control the charging or discharging of the lower battery module 2 and the upper battery module 3.

[0044] Please also read Figures 1 to 3 and Figure 8The box structure 100 mainly includes a box body 1, a liquid inlet interface 20 and a liquid outlet interface 30. The box body 1 includes a mounting platform 12 convexly arranged outwardly toward one side along a first direction X, and a groove 121 is concavely arranged in the mounting platform 12. The groove 121 is used to fix the above-mentioned battery module 9. The box body 1 also includes a mounting block 13 extending outwardly below the mounting platform 12 along the first direction X. The mounting block 13 is provided with a mounting hole 131. The mounting hole 131 is used to fix the entire box structure at a preset position, and the liquid inlet interface 20 and the liquid outlet interface 30 are both arranged below the mounting platform 12 and fixed on the outer side wall of the box body 1. Specifically, the present solution can fix the battery control module 9 at a higher position by setting up the installation platform 12, so as to facilitate the electrical connection with the upper battery module 3 and the lower battery module 2 at the same time. In addition, the present solution hides the liquid inlet interface 20 and the liquid outlet interface 30 under the installation platform 12, so that the liquid inlet interface 20 and the liquid outlet interface 30 will not occupy more space in the horizontal X direction or the horizontal Y direction, which is beneficial to further increase the total power of the double-layer battery pack within the space limited in the X direction and the Y direction, and meet the demand for high endurance of new energy vehicles.

[0045] Please also read Figures 1 to 3 and Figure 8 The box body 1 is provided with a mounting groove 11 connected to the above-mentioned groove 121 on one side of the mounting platform 12. The box structure 100 also includes a liquid cooling bottom plate 4 and two cross beams 6 arranged in the mounting groove 11. The two cross beams 6 are arranged at intervals along the second direction Y, and the two cross beams 6 are fixed on the top of the liquid cooling bottom plate 4. A first mounting space 60 is formed between the two cross beams 6. The above-mentioned lower battery module 2 is placed in this first mounting space 60. The liquid cooling bottom plate 4 is respectively connected to the above-mentioned liquid inlet interface 20 and liquid outlet interface 30. The liquid cooling bottom plate 4 is used to allow the coolant to enter and cool the bottom surface of the lower battery module 2 to ensure that the lower battery module 2 can work within a suitable temperature range. Among them, the cross beam 6 can be fixedly connected to the box body 1 by means of fasteners, and the cross beam 6 can also be welded in the box body 1. The cross beam 6 is used to improve the structural strength of the box body 1. The two cross beams 6 can play a role in limiting the lower battery module 2 together to ensure the stability of the lower battery module 2 installed in the box body 1. The two cross beams 6 are also used to fix the battery modules 3 located on the upper layer.

[0046] Please also read Figures 1 to 3 , Figure 5 and Figure 7The box structure 100 also includes a liquid-cooled top plate 5, which is fixedly connected to the two cross beams 6 respectively. The liquid-cooled top plate 5 is also connected to the liquid inlet interface 20 and the liquid outlet interface 30 respectively. The top surface of the liquid-cooled top plate 5 is used to cool the bottom surface of the upper battery module 3 to ensure that the upper battery module 3 can operate within a suitable temperature range. Specifically, the present solution can ensure that both battery modules can operate within a preset temperature range by providing a liquid-cooled bottom plate 4 for cooling the lower battery module 2 and a liquid-cooled top plate 5 for cooling the upper battery module 3, thereby improving the safety of the double-layer battery module during charging or discharging. Among them, the crossbeam 6 in the existing box body 1 is not only used to limit the position of the lower battery module 2 and improve the structural strength of the box body 1, but also plays a role in fixing the upper battery module 3 and the liquid-cooled top plate 5 in the present solution, so that the overall structure of the battery pack is relatively simple, compact and reasonable, and it is also convenient to install the upper battery module 3 or separate the two battery modules, so as to facilitate the later maintenance of the battery pack or replacement of the battery module.

[0047] Please also read Figure 1 , Figure 2 and Figure 7 The double-layer battery pack also includes a plurality of first fasteners 7 and a plurality of second fasteners 8, wherein the first fasteners 7 pass through the upper battery module 3 and the liquid-cooled top plate 5 in sequence and are fixed on one of the crossbeams 6, and the second fasteners 8 pass through the upper battery module 3 and the liquid-cooled top plate 5 in sequence and are fixed on another crossbeam 6. Through such a design, the advantage of a relatively simple specific structure makes the liquid-cooled top plate 5 and the upper battery module 3 easier to assemble and disassemble, so as to improve the efficiency of subsequent maintenance of the battery pack or replacement of the battery module. Among them, the first fastener 7 and the second fastener 8 can both be bolts, and the crossbeam 6 is provided with an internal thread for connection of the first fastener 7 or the second fastener 8. The internal thread can be realized by directly providing a threaded hole on the top surface of the crossbeam 6, or a nut with an internal thread can be pre-fixed on the crossbeam 6. At this time, the first fastener 7 or the second fastener 8 can also be locked on the crossbeam 6.

[0048] Please also read Figure 1 , Figure 2 , Figure 5 and Figure 7The liquid-cooled top plate 5 is provided with a first liquid inlet 51 and a first liquid outlet 52. Since the liquid-cooled top plate 5 is at a relatively high height, the first liquid inlet 51 and the first liquid outlet 52 are preferably arranged on the bottom surface of the liquid-cooled top plate 5 and face downward, so as to facilitate the communication between the first liquid inlet 51 and the liquid inlet interface 20 through a pipeline, and also facilitate the communication between the first liquid outlet 52 and the liquid outlet interface 30 through a pipeline. The liquid-cooled bottom plate 4 is provided with a second liquid inlet 41 and a second liquid outlet 42. Since the liquid-cooled bottom plate 4 is at a relatively low height, the second liquid inlet 41 and the second liquid outlet 42 are both arranged on the top surface of the liquid-cooled bottom plate 4, so as to facilitate the communication between the second liquid inlet 41 and the liquid inlet interface 20 through a pipeline, and also facilitate the communication between the second liquid outlet 42 and the liquid outlet interface 30 through a pipeline. During operation, the coolant enters from the liquid inlet interface 20 and then is divided into two paths, one of which flows into the liquid-cooled bottom plate 4, and the other flows into the liquid-cooled top plate 5. The coolant in the liquid-cooled bottom plate 4 and the coolant in the liquid-cooled top plate 5 converge and are finally discharged from the liquid outlet interface 30.

[0049] In this embodiment, the upper battery module 3 specifically includes a battery module 31, a tie 32 and two end plates 33, wherein the battery module 31 can be understood as including a plurality of battery cells connected in series or in parallel, and the two end plates 33 are respectively arranged on opposite sides of the battery module 31, and the tie 32 bundles the battery module 31 and the two end plates 33 together, so that the two end plates 33 clamp the battery module 31 together to ensure that the battery cells in the battery module 31 will not fall due to their own weight. Among them, the above-mentioned first fastener 7 passes through one of the end plates 33 and the liquid-cooled top plate 5 in sequence and is fixed to one of the crossbeams 6, and the above-mentioned second fastener 8 passes through another end plate 33 and the liquid-cooled top plate 5 in sequence and is fixed to another crossbeam 6. It can be seen that with the upper battery module 3 of this structural design, the entire upper battery module 3 can form a module, thereby facilitating the purpose of fixing the upper battery module 3 on the top of the lower battery module 2, and also having the advantage of being easy to remove the upper battery module 3, thereby facilitating the repair or replacement of the upper battery module 3 or the lower battery module 2.

[0050] See also Figure 5 or Figure 7, a first support seat 34 is provided on the end plate 33, and the first support seat 34 is used to fix the first electrode extending from the upper battery module 3. It can be understood that the first electrode includes a total positive electrode and a total negative electrode. The conductive member (preferably a copper busbar) extending from the battery control module 9 is also fixed on the first support seat 34 and is in conductive contact with the first electrode, so that the battery control module 9 can control the charging or discharging of the upper battery module 3. By providing the first support seat 34, the reliability of the electrical connection between the upper battery module 3 and the battery control module 9 can be improved, and the risk of the first electrode being easily contacted with other components under vibration conditions due to the lack of fixation and causing a short circuit can be eliminated.

[0051] See also Figure 2 or Figure 7 The side of the crossbeam 6 is provided with a through hole 61 which runs horizontally through the crossbeam 6. A second support seat 10 is fixed at the through hole 61. The second support seat 10 is used to fix the second electrode extending from the lower battery module 2. It can be understood that the second electrode includes a total positive electrode and a total negative electrode. The copper bar extending from the battery control module 9 is also fixed on the second support seat 10 and is in conductive contact with the second electrode, so that the battery control module 9 can control the charging or discharging of the lower battery module 2. By providing the second support seat 10, the reliability of the electrical connection between the lower battery module 2 and the battery control module 9 can be improved, and the risk of the second electrode being easily contacted with other components under the vibration due to the lack of fixation and causing a short circuit can be eliminated.

[0052] See also Figure 8 Along the second direction Y, the two cross beams 6 and the side walls of the mounting groove 11 form a second mounting space 70 for accommodating the collection board. The side of the cross beam 6 facing away from the lower battery module 2 is used for fixing the collection board. For details, please refer to Figure 1 , Figure 2 , Figure 7 and Figure 8The battery pack of this embodiment also includes a master acquisition board 40 and two slave acquisition boards 50. The acquisition board is also called BMS in the art. The acquisition board is used to obtain data information (such as temperature information, voltage information, and current information, etc.) of each battery cell in the battery module to monitor the state of the battery module, prevent the battery module from being overcharged and over-discharged, and extend the service life of the battery module. Compared with a whole larger acquisition board, the master acquisition board 40 and two slave acquisition boards 50 set in this solution can save more installation space, improve the space utilization of the battery pack, and enable the battery pack to be installed in a limited space. Specifically, one of the slave control acquisition boards 50 is electrically connected to the lower battery module 2 and is used to collect data information of the lower battery module 2, and the other slave control acquisition board 50 is electrically connected to the upper battery module 3 and is used to collect data information of the upper battery module 3. The two slave control acquisition boards 50 are electrically connected to the main control acquisition board 40 respectively, and the battery control module 9 is electrically connected to the main control acquisition board 40, so that the battery control module 9 can receive the data information collected by the main control acquisition board 40. The battery control module 9 is also electrically connected to the upper battery module 3 and the lower battery module 2, so that the battery control module 9 can control the charging or discharging of the upper battery module 3 and the lower battery module 2 according to the data information collected by the main control acquisition board 40, so as to improve the safety of the battery pack.

[0053] For more details, please refer to Figures 3 to 6 and Figure 8 , the two beams 6 each have a protrusion 62 protruding toward the second installation space 70 on one side facing away from the lower battery module 2, and the protrusion 62 can be fixed to the beam 6 by bolts or welded to the beam 6, one of the slave control acquisition boards 50 overlaps the top surface of the protrusion 62 of one of the beams 6 and is fixedly connected to the protrusion 62, and the other slave control acquisition board 50 overlaps the top surface of the protrusion 62 of the other beam 6 and is fixedly connected to the protrusion 62, and the bottom surface of the protrusion 62 allows the slave control acquisition board 50 to be locked from top to bottom, which has the advantage of facilitating the installation of the slave control acquisition board 50. In other words, the two slave control acquisition boards 50 are arranged in the second installation space 70 on the side of the corresponding beam 6 facing away from the lower battery module 2, and the master control acquisition board 40 is fixed in the second installation space 70 on the side of one of the beams 6 facing away from the lower battery module 2, and the layout of the positions of the two slave control acquisition boards 50 and one master control acquisition board 40 is conducive to improving the space utilization rate in the battery pack.

[0054] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for the purpose of explaining the principles of the present invention, and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementation methods of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A box structure for a double-layer battery pack, used for installing a lower battery module (2) and an upper battery module (3), characterized in that: The invention comprises a box body (1), a liquid inlet interface (20) and a liquid outlet interface (30), wherein the box body (1) comprises a mounting platform (12) convexly arranged outwardly toward one side along a first direction (X), wherein a groove (121) for fixing a battery control module (9) is concavely arranged in the mounting platform (12), and wherein the box body (1) further comprises a mounting block (13) extending outwardly below the mounting platform (12) along the first direction (X), wherein the mounting block (13) is provided with a mounting hole (131) for fixing the box structure at a preset position, and the liquid inlet interface (20) and the liquid outlet interface (30) are both arranged below the mounting platform (12) and fixed to the outer side wall of the box body (1).

2. The box structure for a double-layer battery pack according to claim 1, characterized in that: The box body (1) is provided with a mounting groove (11) on one side of the mounting platform (12) and is connected to the groove (121). The box structure also includes a liquid cooling bottom plate (4) and two cross beams (6) arranged in the mounting groove (11). The two cross beams (6) are arranged at intervals along a second direction (Y) and are located on the top of the liquid cooling bottom plate (4). A first mounting space (60) for placing the lower battery module (2) is formed between the two cross beams (6) along the second direction (Y). The top surface of the liquid cooling bottom plate (4) is used to cool the bottom surface of the lower battery module (2), and the two cross beams (6) are used to fix the upper battery module (3) located above the lower battery module (2). The liquid cooling bottom plate (4) is respectively connected to the liquid inlet interface (20) and the liquid outlet interface (30).

3. The box structure for a double-layer battery pack according to claim 2, characterized in that: The box structure further comprises a liquid cooling top plate (5) respectively fixed on the two cross beams (6), the top surface of the liquid cooling top plate (5) being used to cool the upper battery module (3), and the liquid cooling top plate (5) being respectively connected to the liquid inlet interface (20) and the liquid outlet interface (30).

4. The box structure for a double-layer battery pack according to claim 3, characterized in that: The liquid-cooling top plate (5) is provided with a first liquid inlet (51) and a first liquid outlet (52) both facing downwards, and the liquid-cooling bottom plate (4) is provided with a second liquid inlet (41) and a second liquid outlet (42) both facing upwards, the first liquid inlet (51) and the second liquid inlet (41) are respectively connected to the liquid inlet interface (20), and the first liquid outlet (52) and the second liquid outlet (42) are respectively connected to the liquid outlet interface (30).

5. The box structure for a double-layer battery pack according to claim 2, characterized in that: A second installation space (70) for accommodating a collection plate is formed between the two cross beams (6) and the side walls of the installation groove (11) along the second direction (Y), and a surface of the cross beam (6) facing away from the lower battery module (2) is used for fixing the collection plate.

6. A double-layer battery pack, characterized in that: A box structure comprising the box structure according to any one of claims 1 to 5, further comprising a lower battery module (2), an upper battery module (3) and a battery control module (9) arranged inside the box body (1); The upper battery module (3) is arranged above the lower battery module (2), and the battery control module (9) is fixed in a groove (121) of the mounting platform (12) and is electrically connected to the lower battery module (2) and the upper battery module (3) respectively.

7. The double-layer battery pack according to claim 6, characterized in that: The double-layer battery pack comprises a box structure as claimed in claim 3, wherein the first fastener (7) and the second fastener (8) are fixed to one of the cross beams (6) after passing through the upper battery module (3) and the liquid-cooled top plate (5) in sequence, and the second fastener (8) is fixed to the other cross beam (6) after passing through the upper battery module (3) and the liquid-cooled top plate (5) in sequence.

8. The double-layer battery pack according to claim 7, characterized in that: The upper battery module (3) comprises a battery module (31), a cable tie (32) and two end plates (33); The two end plates (33) are arranged on two opposite sides of the battery module (31), and the cable tie (32) binds the battery module (31) and the two end plates (33) together; The first fastener (7) passes through one of the end plates (33) and the liquid-cooled top plate (5) in sequence and is then fixed to one of the crossbeams (6); The second fastener (8) passes through the other end plate (33) and the liquid-cooled top plate (5) in sequence and is then fixed to the other crossbeam (6).

9. The double-layer battery pack according to claim 8, characterized in that: The battery control module (9) has a conductive member extending outwardly, the upper battery module (3) has a first electrode extending therefrom, a first support seat (34) is fixed to the end plate (33), and the first electrode is electrically connected to the conductive member and both are fixed to the first support seat (34); A second electrode extends from the lower battery module (2); a through hole (61) extending transversely therethrough is provided on the side of the crossbeam (6); a second support seat (10) is fixed to the through hole (61); and the second electrode is electrically connected to the conductive member and both are fixed to the second support seat (10).

10. The double-layer battery pack according to claim 6, characterized in that: Comprising the box structure as claimed in claim 5, the double-layer battery pack further comprises a master control acquisition board (40) and two slave control acquisition boards (50); One of the slave control collection boards (50) is located in a second installation space (70) on one side of the crossbeam (6) and is electrically connected to the lower battery module (2); Another slave control collection board (50) is located in a second installation space (70) on one side of another crossbeam (6), and is electrically connected to the upper battery module (3); The main control acquisition board (40) is located in one of the second installation spaces (70); The two slave control acquisition boards (50) are electrically connected to the master control acquisition board (40) respectively, and the battery control module (9) is electrically connected to the master control acquisition board (40); The crossbeam (6) is provided with a protrusion (62) protruding toward the second installation space (70), and the slave control acquisition board (50) is overlapped on the top surface of the protrusion (62) and fixedly connected to the protrusion (62).

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