Battery box structure, battery pack and electric equipment

Abstract

The utility model provides a battery box structure, a battery pack and electric equipment, and relates to the technical field of power battery, the battery box structure comprises a first box body, a second box body and a liquid cooling plate assembly, the first box body and the second box body are arranged along the vertical direction, the liquid cooling plate assembly is installed between the first box body and the second box body, the interior of the first box body and the interior of the second box body are used for installing battery modules respectively, and the two opposite surfaces of the liquid cooling plate assembly are used for making contact with the corresponding battery modules respectively. According to the utility model, by adjusting the mounting mode of the battery module and the liquid cooling plate, the occupied space of the liquid cooling plate in the battery box is reduced, and the mounting capacity space of the battery module in the battery box structure is correspondingly improved.

Description

Technical Field

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

[0002] The battery pack is a core component of electrical equipment. As the main source of power for electrical equipment, it is responsible for continuously providing power to electrical equipment such as the electrical components of electric vehicles or electrical appliances in energy storage cabinets.

[0003] In the related art, a battery pack mainly includes a battery box, a battery module and a liquid cooling plate. A liquid cooling plate is installed at the bottom of each battery module, and the battery module and the liquid cooling plate are both installed inside the battery box.

[0004] However, since the multiple liquid cooling plates for cooling the battery modules are installed inside the battery box, the multiple liquid cooling plates occupy a lot of space in the battery box, which correspondingly reduces the capacity space for installing the battery modules in the battery box. Utility Model Content

[0005] The problem solved by the utility model is how to increase the installation capacity space of the battery module in the battery box.

[0006] To solve the above problems, in the first aspect, the present invention provides a battery box structure, comprising a first box body, a second box body and a liquid cooling plate assembly, wherein the first box body and the second box body are arranged in a vertical direction, and the liquid cooling plate assembly is installed between the first box body and the second box body, and the interiors of the first box body and the second box body are used to respectively install battery modules, and the opposite surfaces of the liquid cooling plate assembly are used to respectively contact the corresponding battery modules.

[0007] Optionally, the liquid cooling plate assembly includes a liquid cooling plate body, the liquid cooling plate body includes a first plate and a second plate, the second plate has a flow channel groove, the edge of the first plate is sealed with the edge of the second plate, and a flow channel structure is formed between the flow channel grooves of the first plate and the second plate, and the flow channel structure is used for the circulation of cooling liquid.

[0008] Optionally, the flow channel structure extends out of the edge of the first box along the extension direction of the liquid cooling plate assembly to form an extension portion, and the liquid cooling plate assembly also includes a liquid inlet interface and a liquid outlet interface, and the liquid inlet interface and the liquid outlet interface are respectively connected to the extension portion, and the liquid inlet interface and the liquid outlet interface are located outside the edge of the first box.

[0009] Optionally, the first box body includes an upper cover and a first frame, the first frame is a shell structure with a hollow interior and openings at both ends, the edge of the top opening of the first frame is connected to the upper cover, and the edge of the bottom opening of the first frame is connected to the liquid cooling plate assembly through a first connecting member.

[0010] Optionally, the first box body also includes multiple first cross beams and multiple first longitudinal beams, multiple first longitudinal beams are fixed in the first frame at intervals along the first direction, multiple first cross beams are distributed at intervals along the second direction, the first cross beam is between two adjacent first longitudinal beams, and the two ends of the first cross beam are connected and fixed to the corresponding first longitudinal beams, multiple first longitudinal beams and multiple first cross beams form multiple first installation chambers, each first installation chamber is used to install a battery module and the battery module is used to be connected to the two first longitudinal beams that form the first installation chamber; the second direction is perpendicular to the first direction.

[0011] Optionally, the first box body further includes a plurality of fixing brackets, which are installed on the first crossbeam at intervals along the first direction, and the fixing brackets are used to connect to the chassis of the electric vehicle through a first fastener passing through the upper cover.

[0012] Optionally, a threaded hole is provided on the fixing bracket, and the first box body further includes a sealing ring, at least a portion of the sealing ring is embedded in the threaded hole, one end of the first fastener is threadedly connected to the threaded hole of the fixing bracket, and the other end of the first fastener is passed through the upper cover and is used to connect to the chassis.

[0013] Optionally, the second box body includes a second frame and a bottom guard plate, the second frame is a shell structure with a hollow interior and openings at both ends, the edge of the top opening of the second frame is detachably connected to the liquid cooling plate assembly through a second connecting piece, and the edge of the bottom opening of the second frame is connected to the bottom guard plate.

[0014] Optionally, the cross-sectional structures of the first frame and the second frame along the vertical direction both include a vertical plate, a first support frame and a second support frame, the top end of the vertical plate is bent toward the inner side of the corresponding frame to form the first support frame, and the bottom end of the vertical plate is bent toward the outer side of the frame to form the second support frame.

[0015] Optionally, the second box body further includes a plurality of mounting parts, which are spaced apart along the circumference of the second frame, and the mounting parts are fixedly connected to the outer side wall of the second frame, and the mounting parts are used to connect to the chassis of the electric vehicle.

[0016] Optionally, the mount includes a mount body and a first bracket, the mount body is fixedly mounted on the second frame, the mount body is used to connect to the chassis, the first bracket is arranged at the top end of the mount body, and the first bracket is used to connect to the edge of the liquid cooling plate assembly and the bottom edge of the first frame through a fourth fastener.

[0017] Optionally, the mounting component further includes a second bracket, which is arranged at the bottom end of the mounting component body, and the second bracket abuts against the bottom edge of the second frame.

[0018] The beneficial effects of the battery box structure of the present invention are as follows: the battery box structure mainly includes a first box body, a second box body and a liquid cooling plate assembly. The battery box structure can be installed on the chassis of an electrical device such as an electric vehicle. Since the liquid cooling plate assembly is arranged between the first box body and the second box body, when the battery modules of the battery pack are respectively installed inside the first box body and the second box body, the battery modules in the first box body and the battery modules in the second box body are both in contact with and connected to the liquid cooling plate assembly, so that each battery module transfers heat to the liquid cooling plate assembly through heat transfer, thereby realizing the cooling operation of the battery module. In other words, compared with the prior art in which multiple liquid cooling plates are arranged in the battery box, which reduces the installation capacity space of the battery modules in the battery box, the two battery modules of the present invention share one liquid cooling plate assembly, thereby reducing the space occupied by the liquid cooling plate in the battery box by adjusting the installation method of the battery module and the liquid cooling plate, and correspondingly increasing the installation capacity space of the battery module in the battery box structure.

[0019] In a second aspect, the utility model provides a battery pack, comprising the battery box structure as described above, and also comprising two battery modules, wherein the battery module is installed in a first box of the battery box structure, and the battery module is installed in an inverted manner in a second box of the battery box structure.

[0020] Therefore, since the battery pack includes a battery box structure, the battery pack at least has all the technical effects of the battery box structure, which will not be repeated here.

[0021] In a third aspect, the present invention provides an electrical device comprising the battery pack as described above.

[0022] Therefore, since the electrical equipment includes a battery pack, the electrical equipment at least has all the technical effects of the battery pack, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the axial structure of the battery box structure in an embodiment of the present utility model.

[0024] Figure 2 This is a structural schematic diagram of the liquid cooling plate assembly in an embodiment of the present utility model.

[0025] Figure 3 This is a structural diagram of the first box body in an embodiment of the present utility model.

[0026] Figure 4 This is a schematic structural diagram of a fixing bracket in an embodiment of the present utility model.

[0027] Figure 5 This is a schematic structural diagram of the second box body in an embodiment of the present utility model.

[0028] Figure 6 This is a schematic diagram of the axial structure of the second frame in an embodiment of the present utility model.

[0029] Figure 7 It is a schematic cross-sectional structural diagram of the second frame in an embodiment of the present utility model.

[0030] Figure 8 It is a partial structural diagram of the battery box structure in an embodiment of the present utility model.

[0031] Figure 9 Schematic diagram of the connection structure between the mounting member and the two frames in an embodiment of the present utility model.

[0032] Figure 10 It is a schematic cross-sectional view of the battery box structure in an embodiment of the present utility model.

[0033] Figure 11 for Figure 10 Schematic diagram of the enlarged structure at point A in the middle.

[0034] Figure 12 Schematic diagram of the structure of the second frame in the initial state in an embodiment of the present utility model.

[0035] Figure 13 This is a schematic structural diagram of the second frame after multiple roll bending in an embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 1-Liquid cooling plate assembly; 11-Liquid cooling plate body; 111-First plate; 112-Second plate; 12-Extension portion; 13-Liquid inlet port; 14-Liquid outlet port; 2-First housing; 21-Upper cover; 22-First frame; 23-First crossbeam; 24-First longitudinal beam; 25-Fixed bracket; 251-Threaded hole; 26-Sealing ring; 27-First sealing gasket; 28-Second fastener; 3-Second housing; 31-Second frame; 311-Vertical plate; 31 2-first support frame; 313-second support frame; 3140-straight cavity; 3141-molding frame; 32-bottom guard plate; 33-second cross beam; 34-second longitudinal beam; 35-mounting part; 351-mounting part body; 352-first bracket; 3521-first support plate; 3522-support column; 353-second bracket; 354-fourth fastener; 36-second sealing gasket; 37-third fastener; 4-first connecting part; 5-second connecting part. DETAILED DESCRIPTION

[0038] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0039] The Z-axis in the accompanying drawings represents the vertical direction, that is, the up-down position, with the positive direction of the Z-axis representing the top and the reverse direction of the Z-axis representing the bottom. The X-axis in the accompanying drawings represents the horizontal direction and is designated as the left-right position, with the positive direction of the X-axis representing the right side and the reverse direction of the X-axis representing the left side. The Y-axis in the accompanying drawings represents the front-to-back position, with the positive direction of the Y-axis representing the front side and the reverse direction of the Y-axis representing the rear side. It should also be noted that the aforementioned Z-axis, Y-axis, and X-axis are merely for the purpose of facilitating the description of the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0040] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in this utility model are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0041] It should be noted that the modifications of "one" and "multiple" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0042] In response to the problems existing in the above-mentioned related technologies, this embodiment provides a battery box structure.

[0043] like Figure 1 As shown, an embodiment of the present invention provides a battery box structure, comprising a first box body 2, a second box body 3 and a liquid cooling plate assembly 1, wherein the first box body 2 and the second box body 3 are arranged in a vertical direction, and the liquid cooling plate assembly 1 is installed between the first box body 2 and the second box body 3, and the interiors of the first box body 2 and the second box body 3 are used to respectively install battery modules, and the two opposite surfaces of the liquid cooling plate assembly 1 are used to respectively contact the corresponding battery modules.

[0044] Specifically, the first box body 2 and the second box body 3 may be arranged in a vertical direction. When the two battery modules are respectively installed in the first box body 2 and the second box body 3 , the two battery modules are also arranged in a vertical direction.

[0045] The liquid cooling plate assembly 1 is installed between the first box body 2 and the second box body 3. The two opposite surfaces of the liquid cooling plate assembly 1, such as the top surface and the bottom surface, are in close contact with the corresponding battery modules respectively, so that the heat generated by the battery modules in the first box body 2 and the second box body 3 during operation can be transferred to the liquid cooling plate assembly 1. There is a coolant circulating in the liquid cooling plate assembly 1, so that the battery module can be cooled by utilizing the coolant circulating in the liquid cooling plate assembly 1.

[0046] Among them, the battery box structure adopts a double-layer structure consisting of a first box body 2 and a second box body 3, which has a larger capacity and can accommodate more battery modules. It can be used with electrical equipment such as logistics vehicles to have a larger body space at the bottom, which can truly realize the long-distance transportation tasks of new energy logistics vehicles.

[0047] In this embodiment, the battery box structure mainly includes a first box body 2, a second box body 3 and a liquid cooling plate assembly 1, wherein the battery box structure can be installed on the chassis of an electrical device such as an electric vehicle. Since the liquid cooling plate assembly 1 is arranged between the first box body 2 and the second box body 3, when battery modules are respectively installed inside the first box body 2 and the second box body 3, the battery modules in the first box body 2 and the battery modules in the second box body 3 are both in contact with and connected to the liquid cooling plate assembly 1, so that each battery module transfers heat to the liquid cooling plate assembly 1 through heat transfer, thereby achieving a cooling operation for the battery module. In other words, compared with the prior art in which multiple liquid cooling plates are arranged in the battery box, which reduces the installation capacity space of the battery modules in the battery box, the two battery modules of the present invention share one liquid cooling plate assembly 1, thereby reducing the space occupied by the liquid cooling plate in the battery box by adjusting the installation method of the battery module and the liquid cooling plate, correspondingly increasing the installation capacity space of the battery module in the battery box structure, and also reducing the weight of the battery box structure accordingly.

[0048] Optionally, combined Figure 2 As shown, the liquid cooling plate assembly 1 includes a liquid cooling plate body 11, and the liquid cooling plate body 11 includes a first plate 111 and a second plate 112, the second plate 112 has a flow channel groove, the edge of the first plate 111 is sealed with the edge of the second plate 112, and a flow channel structure is formed between the flow channel grooves of the first plate 111 and the second plate 112, and the flow channel structure is used for the circulation of cooling liquid.

[0049] Specifically, a flow channel groove may be provided on the second plate 112, and the portion of the second plate 112 at the flow channel groove is lower than the other portions of the second plate 112. The edges of the first plate 111 and the second plate 112 may be sealed together by, for example, bonding, riveting, or providing an annular sealing ring.

[0050] The first plate 111 can be arranged above the second plate 112. When the edges of the first plate 111 and the second plate 112 are connected and fixed, the flow channel grooves of the first plate 111 and the second plate 112 form a flow channel structure, and the coolant can circulate in the flow channel structure.

[0051] In this optional embodiment, since the edge of the first plate 111 is sealed with the edge of the second plate 112, not only the first plate 111 and the flow channel groove form a flow channel structure, but also leakage of the coolant in the flow channel structure can be prevented.

[0052] Optionally, combined Figure 2 and Figure 3As shown, the flow channel structure extends out of the edge of the first box body 2 along the extension direction of the liquid cooling plate assembly 1 to form an extension portion 12. The liquid cooling plate assembly 1 also includes a liquid inlet interface 13 and a liquid outlet interface 14. The liquid inlet interface 13 and the liquid outlet interface 14 are respectively connected to the extension portion 12. The liquid inlet interface 13 and the liquid outlet interface 14 are located outside the edge of the first box body 2.

[0053] Specifically, the liquid cooling plate assembly 1 also includes an extension portion 12, and one end of the liquid cooling plate body 11 extends out of the edge of the first box body 2 along the extension direction of the liquid cooling plate assembly 1 to form the extension portion 12, and the liquid inlet interface 13 and the liquid outlet interface 14 can be installed at intervals on the extension portion 12, and the liquid inlet interface 13 and the liquid outlet interface 14 are respectively connected to the extension portion 12.

[0054] The liquid cooling plate assembly 1 can be connected to a liquid cooling device in the following manner. For example, the liquid inlet interface 13 and the liquid outlet interface 14 are used to connect to the liquid cooling device installed on the electric vehicle through the liquid inlet and liquid outlet pipes. The liquid cooling device mainly includes a radiator and a liquid circulation pump. The liquid inlet end of the liquid circulation pump is connected to the radiator, and the liquid outlet end of the liquid circulation pump is connected to the liquid inlet interface 13 on the extension part 12 through the liquid inlet pipe. The liquid outlet interface 14 on the extension part 12 is connected to the radiator through the liquid outlet pipe. The radiator is used to hold coolant. The radiator is a key component of the liquid cooling device. It dissipates heat from the coolant to the external environment by increasing the contact area with the air. The radiator can be a heat exchanger.

[0055] The circulation path of the coolant is as follows: when the liquid circulation pump works, the coolant is drawn from the radiator through the liquid inlet pipe and the liquid inlet interface 13 into the flow channel structure of the liquid cold plate body 11, and circulates in the flow channel structure to take away the heat transferred by the battery module through the heat transfer method, so as to achieve cooling of the battery module. Then, the coolant that absorbs the heat of the battery module flows back to the radiator from the liquid outlet interface 14 through the liquid outlet pipe, so as to dissipate the heat absorbed by the coolant to the external environment through the radiator. Then, the cooled coolant returns to the liquid circulation pump again, and this process is circulated continuously, thereby achieving continuous cooling of the battery module.

[0056] The area of the liquid cooling plate body 11 can match the area of the first box body 2, while the extension portion 12 and the liquid inlet interface 13 and the liquid outlet interface 14 provided on the extension portion 12 are located outside the edge of the first box body 2. In other words, the liquid inlet interface 13 and the liquid outlet interface 14 of the liquid cooling plate assembly 1 are located outside the first box body 2 and the second box body 3, so that the liquid inlet interface 13 and the liquid outlet interface 14 are isolated from the battery modules in the two boxes. Even if the coolant leaks at the liquid inlet interface 13 and the liquid outlet interface 14, it will not enter the first box body 2 and the second box body 3, and accordingly will not damage the more expensive battery modules. Moreover, the liquid inlet interface 13 and the liquid outlet interface 14 are located outside the two boxes. If there is a leak at the two interfaces, the leak point can be seen, and the liquid inlet interface 13 and the liquid outlet interface 14 can be troubleshooted, maintained and replaced.

[0057] Optionally, combined Figure 3 As shown, the first box body 2 includes an upper cover 21 and a first frame 22. The first frame 22 is a shell structure with a hollow interior and openings at both ends. The edge of the top opening of the first frame 22 is connected to the upper cover 21, and the edge of the bottom opening of the first frame 22 is connected to the liquid cooling plate assembly 1 through a first connecting member 4.

[0058] Specifically, combined Figure 10 As shown, an opening can be respectively opened at the top and bottom of the first frame 22, and the upper cover 21 is arranged on the top of the first frame 22. The first box body 2 also includes a second fastener 28. The upper cover 21 and the top opening edge of the first frame 22 can be connected by multiple second fasteners 28. The multiple second fasteners 28 can be distributed at intervals around the edge of the upper cover 21. The second fastener 28 includes a rivet nut and a bolt structure.

[0059] The bottom opening edge of the first frame 22 can be connected to the liquid cooling plate assembly 1 through multiple first connectors 4. The multiple first connectors 4 can be distributed at intervals along the edge of the liquid cooling plate body 11 of the liquid cooling plate assembly 1. The first connectors 4 can be rivet structures.

[0060] In addition, the first box body 2 further includes a first sealing gasket 27 , which is disposed at the connection between the upper cover 21 and the first frame 22 , thereby effectively increasing the sealing performance of the connection between the upper cover 21 and the first frame 22 .

[0061] In this optional embodiment, the bottom opening edge of the first frame 22 is connected to the liquid cooling plate body 11 of the liquid cooling plate assembly 1 via the first connector 4, thereby fixing the first frame 22 and the liquid cooling plate body 11 into an integrated structure. When the battery module is installed in the first housing 2, the battery module is in contact with and connected to the liquid cooling plate body 11, so that the battery module above is cooled by the liquid cooling plate body 11. Because the upper cover 21 is connected to the edge of the top opening of the first frame 22, the top opening of the first frame 22 is sealed from above by the upper cover 21, thereby encapsulating a battery module in the first housing 2.

[0062] Optionally, combined Figure 3 As shown, the first box body 2 also includes a plurality of first cross beams 23 and a plurality of first longitudinal beams 24, and the plurality of first longitudinal beams 24 are fixed in the first frame 22 at intervals along the first direction, and the plurality of first cross beams 23 are distributed at intervals along the second direction, and the first cross beam 23 is located between two adjacent first longitudinal beams 24, and the two ends of the first cross beam 23 are connected and fixed to the corresponding first longitudinal beams 24, and the plurality of first longitudinal beams 24 and the plurality of first cross beams 23 form a plurality of first installation chambers, each of the first installation chambers is used to install a battery module and the battery module is used to be connected to the two first longitudinal beams 24 that form the first installation chamber; the second direction is perpendicular to the first direction.

[0063] Specifically, the first direction can be Figure 3 The X axis of the coordinate system is parallel to the second direction. Figure 3 The Y axis of the coordinate system is parallel; the extension direction of the first longitudinal beam 24 is parallel to the extension direction of the first frame 22.

[0064] There are at least two first longitudinal beams 24 and at least one first transverse beam 23 . A first transverse beam 23 is installed between two adjacent first longitudinal beams 24 , so both ends of the first transverse beam 23 are respectively connected and fixed to corresponding first longitudinal beams 24 .

[0065] The battery module is installed in the first frame 22. Specifically, multiple first longitudinal beams 24 and multiple first cross beams 23 form multiple first installation chambers. The interior of the first installation chamber is used to install one battery module. The battery module can be connected to the first longitudinal beam 24 to fix the installation position of the battery module through the first longitudinal beam 24 to prevent the battery module from offsetting, shaking and other problems.

[0066] In this optional embodiment, since multiple first longitudinal beams 24 are installed in the first frame 22 at intervals along the first direction, and the first cross beam 23 is installed between two adjacent first longitudinal beams 24, the first longitudinal beams 24 can not only install and fix the battery module, but also the first longitudinal beams 24 and the first cross beams 23 arranged in the first frame 22 can respectively enhance the mechanical strength of the entire first box body 2 along the second direction and the first direction, reduce the possibility of deformation of the battery box structure, and correspondingly extend the service life of the battery box structure.

[0067] Optionally, combined Figure 3 and Figure 5 As shown, the first box body 2 further includes a plurality of fixing brackets 25 , which are installed on the first crossbeam 23 at intervals along the first direction. The fixing brackets 25 are used to connect to the chassis of the electric vehicle through a first fastener passing through the upper cover 21 .

[0068] Specifically, there are multiple fixing brackets 25, and multiple fixing brackets 25 are installed at intervals on the upper part of the first beam 23 along the first direction, that is, the extension direction of the first beam 23, wherein the bottom end of the fixing bracket 25 can be fixed on the first beam 23 by bolts or other means.

[0069] The top end of the fixing bracket 25 can be connected to the chassis of the electric vehicle in the following manner, for example, the bottom end of the first fastener is connected and fixed to the fixing bracket 25, and the top end of the first fastener is passed through the upper cover 21 and fixedly connected to the chassis. At this time, the fixing bracket 25 and the first fastener are equivalent to the connection structure between the battery box structure and the chassis.

[0070] In this optional embodiment, since multiple fixing brackets 25 are fixedly installed on the first crossbeam 23 at intervals along the first direction, the top end of the fixing bracket 25 can abut against the bottom wall of the upper cover 21. At this time, the fixing bracket 25 has a certain supporting effect on the upper cover 21, which can effectively prevent the upper cover 21 from deformation; in addition, since the top end of the fixing bracket 25 is connected to the chassis through the first fastener, the battery box structure and the chassis are fixedly connected through the fixing bracket 25 and the first fastener.

[0071] Optionally, combined Figures 4 to 6 As shown, a threaded hole 251 is provided on the fixing bracket 25, and the first box body 2 also includes a sealing ring 26, at least part of which is embedded in the threaded hole 251, and one end of the first fastener is threadedly connected to the threaded hole 251 of the fixing bracket 25, and the other end of the first fastener is passed through the upper cover 21 and is used to connect to the chassis.

[0072] Specifically, the fixing bracket 25 can be connected and fixed to the first fastener in the following manner. For example, the first fastener includes a nut and a long bolt. A threaded hole 251 is provided on the fixing bracket 25. The threaded hole 251 is arranged along the extension direction of the fixing bracket 25. A sealing ring 26 is installed on the top of the threaded hole 251 of the fixing bracket 25. The bottom end of the long bolt is threadedly connected to the threaded hole 251 of the fixing bracket 25. The top end of the long bolt is passed through the upper cover 21 and the chassis and connected to the nut, thereby realizing the connection and fixation of the battery box structure and the chassis.

[0073] In this optional embodiment, since the threaded hole 251 of the fixing bracket 25 is connected to the chassis through the first fastener, not only the connection and fixation of the battery box structure and the chassis are achieved, but also since at least part of the sealing ring 26 is embedded in the threaded hole 251, when the upper cover 21 is connected and fixed to the first frame 22, the sealing ring 26 on the fixing bracket 25 abuts against the upper cover 21, so that there is soft contact between the fixing bracket 25 and the upper cover 21, so that the sealing ring 26 can not only seal the connection between the first fastener and the upper cover 21, but also effectively reduce the vibration amplitude between the fixing bracket 25 and the upper cover 21, as well as between the upper cover 21 and the chassis during the driving of the electric vehicle. In other words, the sealing ring 26 can also play a certain role in isolating the battery box structure relative to the chassis.

[0074] Optionally, combined Figure 5 As shown, the second box body 3 includes a second frame 31 and a bottom guard plate 32. The second frame 31 is a shell structure with a hollow interior and openings at both ends. The edge of the top opening of the second frame 31 is detachably connected to the liquid cooling plate assembly 1 through a second connecting member 5, and the edge of the bottom opening of the second frame 31 is connected to the bottom guard plate 32.

[0075] Specifically, combined Figure 10 As shown, an opening can be respectively provided at the top and bottom of the second frame 31, the liquid cooling plate assembly 1 can be arranged at the top opening of the second frame 31, and the bottom guard plate 32 is arranged at the bottom opening of the second frame 31. The second box body 3 also includes a third fastener 37. The bottom guard plate 32 and the bottom opening edge of the second frame 31 can be connected by multiple third fasteners 37. The multiple third fasteners 37 can be distributed at intervals around the edge of the bottom guard plate 32. The third fastener 37 includes a rivet nut and a bolt structure.

[0076] The top opening edge of the second frame 31 can be detachably connected to the liquid cooling plate assembly 1 through multiple second connecting members 5. The multiple second connecting members 5 can be distributed at intervals along the edge of the liquid cooling plate body 11 of the liquid cooling plate assembly 1. The second connecting members 5 may include fixing bolts and core-pulling nuts.

[0077] The second box body 3 further includes a second sealing gasket 36 , which is disposed at the connection between the bottom guard plate 32 and the second frame 31 , thereby effectively increasing the sealing performance of the connection between the bottom guard plate 32 and the second frame 31 .

[0078] In this optional embodiment, the edge of the bottom opening of the second frame 31 is detachably connected to the liquid cooling plate body 11 of the liquid cooling plate assembly 1 via a second connector 5. This allows the liquid cooling plate assembly 1 to be separated from the second housing at this point in the event of a battery module failure, simplifying maintenance and replacement of the battery module and ensuring cost-effective repairs in the event of a subsequent failure. Because the bottom guard plate 32 is connected to the edge of the bottom opening of the second frame 31, the bottom opening of the second frame 31 is sealed from below by the bottom guard plate 32, thereby not only enclosing another battery module within the second housing 3 but also providing safety protection for the battery module from below.

[0079] The upper cover 21 and the bottom guard plate 32 can be made of TDS composite material, thereby reducing the weight of the entire battery box structure to the greatest extent.

[0080] Optionally, combined Figure 5 As shown, the second box body 3 also includes a second cross beam 33 and multiple second longitudinal beams 34, multiple second longitudinal beams 34 are fixed in the second frame 31 at intervals along the first direction, and multiple second cross beams 33 are distributed at intervals along the second direction, the second cross beam 33 is between two adjacent second longitudinal beams 34, and the two ends of the second cross beam 33 are connected and fixed to the corresponding second longitudinal beams 34, multiple second longitudinal beams 34 and multiple second cross beams 33 form multiple second installation chambers, each second installation chamber is used to install a battery module and the battery module is used to be connected to the two second longitudinal beams 34 that form the second installation chamber; the second direction is perpendicular to the first direction.

[0081] Specifically, the extending direction of the second longitudinal beam 34 is parallel to the extending direction of the second frame 31 , and the extending direction of the second transverse beam 33 is perpendicular to the extending direction of the second longitudinal beam 34 .

[0082] There are at least two second longitudinal beams 34 and at least one second transverse beam 33 . A second transverse beam 33 is installed between two adjacent second longitudinal beams 34 , so both ends of the second transverse beam 33 are respectively connected and fixed to corresponding second longitudinal beams 34 .

[0083] Another battery module is installed in the second frame 31. Specifically, multiple second longitudinal beams 34 and multiple second cross beams 33 form multiple second installation chambers. The interior of the second installation chamber is used to install one battery module. The battery module can be connected to the second longitudinal beam 34 to fix the installation position of the battery module through the second longitudinal beam 34 to prevent the battery module from offsetting, shaking and other problems.

[0084] In this optional embodiment, since a plurality of second longitudinal beams 34 are installed in the second frame 31 at intervals along the first direction, and a second cross beam 33 is installed between two adjacent second longitudinal beams 34, the second longitudinal beams 34 not only install and fix the battery module, but also the second longitudinal beams 34 and the second cross beams 33 arranged in the second frame 31 can respectively enhance the mechanical strength of the entire second box body 3 along the second direction and the first direction, thereby reducing the possibility of deformation of the battery box structure and correspondingly extending the service life of the battery box structure.

[0085] Optionally, combined Figure 6 and Figure 7 As shown, the cross-sectional structures of the first frame 22 and the second frame 31 along the vertical direction include a vertical plate 311, a first support frame 312 and a second support frame 313. The top end of the vertical plate 311 is bent toward the inner side of the corresponding frame to form the first support frame 312, and the bottom end of the vertical plate 311 is bent toward the outer side of the frame to form the second support frame 313.

[0086] Specifically, the first frame 22 and the second frame 31 have the same structure. The second frame 31 is used as an example for explanation. Figure 5 The coordinate system XZ sits on the plane to cut the second frame 31 to form Figure 7 Schematic diagram of the cross-sectional structure of the second frame 31.

[0087] Figure 7 The cross-sectional structure of the second frame 31 includes a vertical plate 311, a first support frame 312 and a second support frame 313. The top end of the vertical plate 311 can be bent multiple times toward the inner side of the second box body 3 (or toward the battery module) to form the first support frame 312, and the bottom end of the vertical plate 311 can be bent multiple times toward the outer side of the second box body 3 (or away from the battery module) to form the second support frame 313.

[0088] The vertical plate 311 may be a plate-shaped structure extending vertically. The cross-sectional shape of the first support frame 312 and the second support frame 313 may be a quadrilateral.

[0089] In this optional embodiment, since the middle portion of the first frame 22 and the second frame 31 is a vertical plate 311, the weight and material of the first frame 22 and the second frame 31 can be reduced, and the weight and cost of the battery box structure can be reduced accordingly; since the cross-sectional shape of the first support frame 312 and the second support frame 313 can be a quadrilateral, it can not only support the components located on the upper part of the support frame, but also can correspondingly increase the mechanical strength of the first box body 2 and the second box body 3 in the first direction and the second direction, further increasing the service life of the battery box structure.

[0090] Optionally, combined Figure 5 and Figure 8 As shown, the second box body 3 also includes a plurality of mounting parts 35, which are distributed at intervals along the circumference of the second frame 31, and the mounting parts 35 are fixedly connected to the outer side wall of the second frame 31. The mounting parts 35 are used to connect to the chassis of the electric vehicle.

[0091] Specifically, a plurality of mounting members 35 may be arranged at intervals along the circumference of the second frame 31 . For example, mounting members 35 may be provided on the side walls and corners of the second frame 31 , and the mounting members 35 are fixedly connected to the outer wall of the second frame 31 .

[0092] In this optional embodiment, since multiple mounting parts 35 are fixedly installed at intervals on the circumferential outer wall of the second frame 31, and each mounting part 35 can be connected and fixed to the chassis of the electric vehicle, so that the circumferential connection points between the second frame 31 and the chassis are evenly distributed, the entire battery box structure can be stably fixed on the chassis through multiple mounting parts 35.

[0093] Optionally, combined Figure 9 and Figure 11 As shown, the mounting part 35 includes a mounting part body 351 and a first bracket 352. The mounting part body 351 is fixedly installed on the second frame 31. The mounting part body 351 is used to connect to the chassis. The first bracket 352 is arranged at the top of the mounting part body 351, and the first bracket 352 is used to connect to the edge of the liquid cooling plate assembly 1 and the bottom edge of the first frame 22 through a fourth fastener 354.

[0094] Specifically, the mounting body 351 can be fixed to the outer wall of the second frame 31 by welding, the first bracket 352 and the mounting body 351 can be an integrally formed structure, or the first bracket 352 can be installed on the mounting body 351 by fixing, such as integrally forming, welding, etc.

[0095] The mounting member 35 further includes a fourth fastener 354, the top end of which is passed through the edge of the liquid cooling plate assembly 1 and connected to the bottom edge of the first frame 22 (eg, the second support frame of the first frame). Figure 9 As shown, the first bracket 352 may include at least a first support plate 3521, and the first support plate 3521 may be an L-shaped structure. A through hole is provided on the first support plate 3521 so that the bottom end of a fourth fastener 354 can pass through the first support plate 3521 of the first bracket 352; the first bracket 352 may also include a support column 3522, and the support column 3522 is installed on the mounting body 351. A connecting hole is provided on the support column 3522, and the connecting hole can be a threaded hole or a through hole structure so that the bottom end of another fourth fastener 354 can be connected to the connecting hole.

[0096] The mounting body 351 can be mounted on the chassis in the following manner. For example, a through hole is opened on the mounting body 351, and a fifth fastener is passed through the through hole of the mounting body 351 and the chassis to achieve a fixed connection between the mounting body 351 and the chassis.

[0097] The support column 3522 is arranged vertically, and the support column 3522 is located between the second support frame 313 of the second frame 31 and the liquid cooling plate assembly 1, and the length of the support column 3522 matches the distance between the second support frame 313 of the second frame 31 and the liquid cooling plate assembly 1, so that when the first box body 2 and the liquid cooling plate assembly 1 are installed on the upper part of the second frame 31, the liquid cooling plate assembly 1 and the first box body 2 can be supported in the vertical direction by the support column 3522, which is equivalent to increasing the vertical support stiffness of the second frame 31 to the liquid cooling plate assembly 1 and the first box body 2, thereby reducing the possibility of deformation of the second frame 31 and further increasing the strength of the entire battery box structure.

[0098] The bottom end of the fourth fastener 354 can be fixedly connected to the first bracket 352 installed on the mounting body 351. Each first bracket 352 can be connected to the second support frame 313 of the first frame 22 and the edge of the liquid cooling plate assembly 1 through at least one fourth fastener 354. Specifically, the fourth fastener 354 is passed through the second support frame of the first frame 22, the edge of the liquid cooling plate assembly 1 and is connected to the first bracket 352 of the mounting member 35. In other words, since the mounting body 351 is fixedly installed on the second frame 31, the first frame 22, the liquid cooling plate assembly 1 and the second frame 31 are fixed into an integrated structure through the fourth fastener 354, thereby effectively preventing the first frame 22, the liquid cooling plate assembly 1 and the second frame 31 from separating, further improving the assembly stability of the battery box structure.

[0099] Optionally, combined Figure 8 and Figure 9 As shown, the mounting component 35 further includes a second bracket 353 . The second bracket 353 is disposed at the bottom end of the mounting component body 351 , and the second bracket 353 abuts against the bottom edge of the second frame 31 .

[0100] Specifically, the second bracket 353 may include at least one second support plate, the second support plate may be an L-shaped structure, the second support plate and the mounting body 351 may be an integrated structure, and the second bracket 353 abuts against the bottom edge of the second frame 31 (that is, the second support frame 313 of the second frame 31).

[0101] In this optional embodiment, when the mounting body 351 is installed on the outer wall of the second frame 31, the bottom end of the second bracket 353 abuts against the bottom edge of the second frame 31, so that on the basis of the mounting member 35 connecting the first frame 22, the liquid cooling plate assembly 1 and the second frame 31 into an integrated structure, the second bracket 353 further increases the vertical support stiffness of the mounting member 35 on the liquid cooling plate assembly 1 and the first frame 22, thereby further increasing the strength of the entire battery box structure.

[0102] Combine Figure 12 and Figure 13 As shown, the first frame 22 and the second frame 31 have the same structure. Taking the second frame 31 as an example, the processing process of the second frame 31 is described here. For example, the steel plate is roll-formed to form a straight cavity 3140 (see Figure 12 ), and then the straight cavity 3140 is processed by a roll bending process through a roll bending machine to form Figure 13 The forming frame 3141 is finally welded at the interface of the forming frame 3141 by a welding process to form a second frame 31 with an integrated structure. Since the second frame 31 formed by the above-mentioned method has only one frame weld on the outside, the risk of reduced strength of the corresponding frame due to welding quality is reduced, and the roller bending specifications can be flexibly designed according to different vehicle body sizes, which can match different vehicle bodies and accommodate battery modules of different specifications. It can meet projects with different needs of different customers, better adapt to different needs, and also make the second frame 31 have high strength and durability.

[0103] A battery pack provided by an embodiment of the present invention includes the battery box structure as described in the above embodiment, and also includes two battery modules. The battery modules are installed in the first box body 2 of the battery box structure, and the battery modules are installed inverted in the second box body 3 of the battery box structure.

[0104] Specifically, the battery module in the first box body 2 is installed in the first box body 2 in an upright position. In other words, the electrodes of the battery module face upward. When the battery module is installed in the first box body 2, the bottom surface of the battery module is in contact and connected with the liquid cooling plate assembly 1.

[0105] The battery module is installed upside down in the second housing 3. In other words, the electrodes of the battery module face downward. When the battery module is installed in the second housing 3, the end of the battery module without the electrodes contacts the liquid cooling plate assembly 1, thereby cooling the inverted battery module below it through the liquid cooling plate assembly 1. At least one battery module is installed in each of the first housing 2 and the second housing 3.

[0106] The beneficial effects of the battery pack of this embodiment relative to the prior art are the same as those of the above-mentioned battery box structure and will not be described again here.

[0107] An embodiment of the present invention provides an electrical device, comprising the battery pack described in the above embodiment.

[0108] Specifically, when the electrical equipment is an electric vehicle, the electric vehicle includes the above-mentioned battery pack and a chassis, and the battery pack is installed on the chassis. Specifically, the mounting bracket of the battery pack is fixedly connected to the chassis through a first fastener, and the multiple mounting parts 35 of the battery pack are fixedly connected to the chassis through a fifth fastener, thereby achieving the fixed installation of the entire battery pack on the chassis.

[0109] The electric vehicle can be any electric vehicle with a larger or larger chassis space, so that when the battery pack is installed on the chassis, the bottom of the battery pack can be effectively prevented from being bumped by foreign objects. The electric vehicle can be a commercial vehicle, a transport vehicle, etc.

[0110] The electrical equipment is not limited to the above-mentioned electric vehicles, but can also be energy storage cabinets, aircraft, etc. As long as various electrical equipment that requires the above-mentioned battery pack is applicable to this technical solution, no specific limitation is made here.

[0111] The beneficial effects of the electrical equipment of this embodiment relative to the prior art are the same as those of the above-mentioned battery pack, and will not be described again here.

[0112] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A battery box structure, characterized in that: The invention comprises a first box (2), a second box (3) and a liquid cooling plate assembly (1), wherein the first box (2) and the second box (3) are arranged in a vertical direction, the liquid cooling plate assembly (1) is installed between the first box (2) and the second box (3), the interiors of the first box (2) and the second box (3) are used to respectively install battery modules, and the opposite surfaces of the liquid cooling plate assembly (1) are used to respectively contact the corresponding battery modules.

2. The battery box structure according to claim 1, characterized in that: The liquid cooling plate assembly (1) includes a liquid cooling plate body (11), the liquid cooling plate body (11) includes a first plate (111) and a second plate (112), the second plate (112) has a flow channel groove, the edge of the first plate (111) is sealed with the edge of the second plate (112), a flow channel structure is formed between the flow channel grooves of the first plate (111) and the second plate (112), and the flow channel structure is used for the circulation of cooling liquid.

3. The battery box structure according to claim 2, characterized in that: The flow channel structure extends out of the edge of the first box (2) along the extension direction of the liquid cooling plate assembly (1) to form an extension portion (12). The liquid cooling plate assembly (1) further includes a liquid inlet interface (13) and a liquid outlet interface (14). The liquid inlet interface (13) and the liquid outlet interface (14) are respectively connected to the extension portion (12). The liquid inlet interface (13) and the liquid outlet interface (14) are located outside the edge of the first box (2).

4. The battery box structure according to claim 1, characterized in that: The first box body (2) includes an upper cover (21) and a first frame (22). The first frame (22) is a shell structure with a hollow interior and openings at two opposite ends. The edge of the top opening of the first frame (22) is connected to the upper cover (21), and the edge of the bottom opening of the first frame (22) is connected to the liquid cooling plate assembly (1) via a first connecting member (4).

5. The battery box structure according to claim 4, characterized in that: The first box body (2) further comprises a plurality of first transverse beams (23) and a plurality of first longitudinal beams (24), wherein the plurality of first longitudinal beams (24) are fixed in the first frame (22) at intervals along a first direction, and the plurality of first transverse beams (23) are distributed at intervals along a second direction, wherein the first transverse beam (23) is located between two adjacent first longitudinal beams (24), and both ends of the first transverse beam (23) are connected and fixed to the corresponding first longitudinal beams (24), and the plurality of first longitudinal beams (24) and the plurality of first transverse beams (23) enclose a plurality of first installation chambers, wherein each first installation chamber is used for installing a battery module and the battery module is used for connecting to the two first longitudinal beams (24) enclosing the first installation chamber; and the second direction is perpendicular to the first direction.

6. The battery box structure according to claim 5, characterized in that: The first box body (2) further comprises a plurality of fixing brackets (25), the plurality of fixing brackets (25) being installed on the first crossbeam (23) at intervals along the first direction, and the fixing brackets (25) being used to connect to the chassis of the electric vehicle via a first fastener penetrating the upper cover (21).

7. The battery box structure according to claim 6, characterized in that: The fixing bracket (25) is provided with a threaded hole (251), the first box (2) further comprises a sealing ring (26), at least a portion of the sealing ring (26) is embedded in the threaded hole (251), one end of the first fastener is threadedly connected to the threaded hole (251) of the fixing bracket (25), and the other end of the first fastener is passed through the upper cover (21) and is used to connect to the chassis.

8. The battery box structure according to any one of claims 4 to 7, characterized in that: The second box body (3) includes a second frame (31) and a bottom guard plate (32). The second frame (31) is a shell structure with a hollow interior and openings at two opposite ends. The edge of the top opening of the second frame (31) is detachably connected to the liquid cooling plate assembly (1) via a second connecting member (5), and the edge of the bottom opening of the second frame (31) is connected to the bottom guard plate (32).

9. The battery box structure according to claim 8, characterized in that: The cross-sectional structures of the first frame (22) and the second frame (31) along the vertical direction both include a vertical plate (311), a first support frame (312) and a second support frame (313), wherein the top end of the vertical plate (311) is bent toward the inner side of the corresponding frame to form the first support frame (312), and the bottom end of the vertical plate (311) is bent toward the outer side of the frame to form the second support frame (313).

10. The battery box structure according to claim 8, characterized in that: The second box (3) further comprises a plurality of mounting parts (35), wherein the plurality of mounting parts (35) are distributed at intervals along the circumference of the second frame (31), and the mounting parts (35) are fixedly connected to the outer side wall of the second frame (31), and the mounting parts (35) are used to connect to the chassis of the electric vehicle.

11. The battery box structure according to claim 10, characterized in that: The mounting part (35) includes a mounting part body (351) and a first bracket (352), wherein the mounting part body (351) is fixedly mounted on the second frame (31), the mounting part body (351) is used to connect to the chassis, the first bracket (352) is arranged at the top end of the mounting part body (351), and the first bracket (352) is used to connect to the edge of the liquid cooling plate assembly (1) and the bottom edge of the first frame (22) through a fourth fastener (354).

12. The battery box structure according to claim 11, characterized in that: The mounting member (35) further includes a second bracket (353), the second bracket (353) being arranged at the bottom end of the mounting member body (351), and the second bracket (353) being in contact with the bottom edge of the second frame (31).

13. A battery pack, characterized in that: The battery box structure comprises the battery box structure according to any one of claims 1 to 12, and further comprises a battery module, wherein the battery module is installed in the first box body (2) of the battery box structure, and the battery module is installed in an inverted manner in the second box body (3) of the battery box structure.

14. An electrical device, characterized in that: Comprising the battery pack as claimed in claim 13.

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