A battery case

Abstract

The application discloses a battery box, comprising: a battery box body, comprising a frame body group, a liquid cooling plate, and an upper cover plate, the liquid cooling plate is arranged at the bottom of the frame body group through a first welding assembly, and the upper cover plate is arranged at the top of the frame body group through a second welding assembly. The application provides a battery box, which comprises a battery box body, comprising a frame body group, a liquid cooling plate, and an upper cover plate, specifically, the liquid cooling plate is installed at the bottom of the frame body group through a first welding assembly, and the upper cover plate is installed at the top of the frame body group through a second welding assembly, so that a closed cavity is formed in the battery box body, thereby realizing the sealing performance. When the first welding assembly is connected with the bottom of the frame body group, it is not necessary to punch holes in the bottom of the frame body group, thereby avoiding the risk of air tightness failure in the punching holes in the frame body group or air tightness failure in the FDS thread gap in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of battery boxes, and more particularly, to a battery box. Background Art

[0002] The current sealing connection methods for the upper and lower covers of battery boxes (made of steel, aluminum alloy, or a combination of steel and aluminum) on the market primarily utilize threaded connections (rivet nuts and bolts), FDS (flow drill threading with double sealant), FSW (friction stir welding), and core-pulling rivets. These connection methods often result in poor airtightness.

[0003] Batteries, as one of the core components of new energy vehicles, primarily provide driving energy. Their functional and technical specifications must meet the following basic national standards: ① GB 38031-2020 (Safety Requirements for Power Batteries for Electric Vehicles) and ② GB 18384-2020 (Safety Requirements for Electric Vehicles). As the primary structural component of the battery, the battery box ensures both mechanical strength and airtightness. The interior of the battery tray must meet IP67 standards.

[0004] As a key safety component, airtight failure in batteries can directly lead to safety accidents and even endanger lives. Currently, all battery box sealing connection processes used on the market (screw connection, FDS, FSW, and blind riveting) carry some risk of airtight failure, and the process costs are relatively high.

[0005] 1) Screw connection process: Before riveting, the frame assembly needs to be drilled first. The rivet nut adopts a blind hole structure. The flange surface of the rivet nut (the riveted interface with the frame) needs to be resistant to glue falling, which increases the process cost. The risk of airtight failure occurs at the position where the rivet nut and the frame meet.

[0006] 2) FDS connection process (aluminum alloy frame structure): After the FDS connection is completed, sealant needs to be added for sealing. The risk of airtight failure occurs in the FDS thread gap.

[0007] 3) FSW connection process (aluminum alloy frame structure): high investment cost, low production efficiency, high requirements for overlap or butt flatness, and poor airtightness easily occurs in poor connection gap positions.

[0008] 4) Blind rivet connection process (rolled steel frame structure, aluminum alloy frame structure): Before riveting, the frame assembly needs to be drilled first, and the blind rivet flange surface (the rivet joint surface with the frame) needs to be made more resistant to glue falling, which increases the process cost. The risk of airtight failure occurs at the position where the blind rivet flange surface and the frame are matched and at the empty tube position inside the blind rivet.

[0009] In view of the risk of airtight failure in the current market connection process, a battery box is proposed to at least partially solve the problems existing in the existing technology. Summary of the Invention

[0010] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0011] In order to at least partially solve the above problems, the present invention provides a battery box, comprising: a battery box main body, which includes a frame body group, a liquid cooling plate, and an upper cover plate, wherein the liquid cooling plate is configured at the bottom of the frame body group through a first welding assembly, and the upper cover plate is configured at the top of the frame body group through a second welding assembly.

[0012] According to the battery box of an embodiment of the present invention, the first welding assembly includes a welding rod, a welding seat, and a fixing part. The welding seat is arranged at the upper end of the welding rod, the upper end of the welding rod is welded to the bottom of the frame body group, the liquid cooling plate is connected to the welding seat, and the fixing part is passed through the welding rod and presses against the liquid cooling plate.

[0013] The battery box according to the embodiment of the present invention further includes: an airtight layer, which is arranged between the liquid cooling plate and the bottom of the frame body group, and the welding seat is penetrated in the airtight layer.

[0014] According to the battery box of an embodiment of the present invention, a bottom protective plate is configured at the bottom of the liquid cooling plate, an inner cavity is provided between the bottom protective plate and the liquid cooling plate, the liquid cooling plate includes a substrate and a flow channel plate, the inner cavity is further provided with an inner protective plate, and the flow channel plate is located above the inner protective plate, the flow channel plate has a plurality of flow channel recesses, and a cooling channel is provided between the plurality of flow channel recesses and the liquid cooling plate, and the cooling channel has a coolant.

[0015] According to the battery box of an embodiment of the present invention, the battery box body further has a control cabin, and the control cabin is equipped with a first liquid inlet pipe and a first liquid outlet pipe connected to the cooling channel, and the first liquid inlet pipe and the first liquid outlet pipe are connected to an external circulation pump.

[0016] According to the battery box of the embodiment of the present invention, a battery inner frame is further configured in the battery box main body, and the battery inner frame divides the battery box main body into a control compartment and two battery compartments.

[0017] According to the battery box of an embodiment of the present invention, the battery inner frame includes two first inner beam frames and a second inner beam frame, the second inner beam frame is arranged between the two first inner beam frames, and a control cabin is provided between one of the first inner beam frames and the frame body group.

[0018] According to the battery box of an embodiment of the present invention, two connector assemblies are further configured on the surface frame of the frame body group, one of the connector assemblies is used to connect the first liquid inlet pipe with the external circulation pump, and the other connector assembly is used to connect the first liquid outlet pipe with the external circulation pump.

[0019] According to the battery box of an embodiment of the present invention, the joint assembly includes an inner joint section and a leak-proof insert, the leak-proof insert is arranged on the inner joint section, and the leak-proof insert is provided with an outer leak-proof cap, an inner leak-proof cap, a rotating mechanism, and an inner push-up mechanism, the outer leak-proof cap presses against the outer wall of the top surface frame and wraps the rotating mechanism, the rotating mechanism is movably connected to the inner push-up mechanism, so that the inner push-up mechanism presses against and is fixed on the two inner walls of the surface frame, and the inner leak-proof cap is arranged on the inner end of the leak-proof insert and presses against the inner wall of the top surface frame.

[0020] According to the battery box of an embodiment of the present invention, the outer leak-proof cap includes an outer top plate, an inner top plate, and an intermediate wrapping tube. The outer top plate is arranged on the outer end of the leak-proof insert tube through a fastening rod. The intermediate wrapping tube is arranged between the outer top plate and the inner top plate, and is sleeved on the leak-proof insert tube to wrap the rotating mechanism. A plurality of first spring bodies are also arranged between the outer top plate and the inner top plate, so that the inner top plate presses against the outer wall of the surface frame.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] The present invention provides a battery pack, comprising a battery pack body, a frame assembly, a liquid cooling plate, and an upper cover. Specifically, the liquid cooling plate is mounted on the bottom of the frame assembly via a first welding assembly, while the upper cover is mounted on the top of the frame assembly via a second welding assembly, thereby forming a sealed cavity within the battery pack body and achieving sealing performance. When the first welding assembly is connected to the bottom of the frame assembly, there is no need to drill holes in the bottom of the frame assembly, thereby avoiding the risk of airtightness failure caused by drilling holes in the frame assembly in the prior art, or airtightness failure in the gap between the FDS threads.

[0023] The battery box described in the present invention, and other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by technical personnel in this field through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 Schematic diagram of the internal structure of the battery box body in the present invention Figure 1 .

[0026] Figure 2 It is a partial structural diagram of the present invention.

[0027] Figure 3 It is a partial structural schematic diagram of the liquid cooling plate in the present invention.

[0028] Figure 4 Schematic diagram of the internal structure of the battery box body in the present invention Figure 2 .

[0029] Figure 5 Schematic diagram of the structure of the connector assembly of the present invention.

[0030] Figure 6 Schematic diagram of the internal structure of the connector assembly in the present invention Figure 1 .

[0031] Figure 7 Schematic diagram of the internal structure of the connector assembly in the present invention Figure 2 .

[0032] Figure 8 It is a partial structural diagram of the leak-proof insert in the present invention.

[0033] Figure 9 For the present invention Figure 7 Schematic diagram of the enlarged structure of the part A in the middle.

[0034] Figure 10 For the present invention Figure 9 Schematic diagram of the enlarged structure of the part B in the middle.

[0035] Figure 11 It is a structural schematic diagram of the inner moving frame block in the present invention.

[0036] Figure 12 Schematic diagram of the internal structure of the composite telescopic mechanism of the present invention. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0038] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0039] like Figure 1As shown, the present invention provides a battery box, comprising: a battery box main body 100, which includes a frame body group 1, a liquid cooling plate 2, and an upper cover plate 3. Specifically, the liquid cooling plate 2 is installed on the bottom of the frame body group 1 through a first welding assembly 4, and the upper cover plate 3 is installed on the top of the frame body group 1 through a second welding assembly, so that a closed cavity is formed inside the battery box main body 100, thereby achieving airtight performance, so as to facilitate the placement of battery pack units (not shown) in the battery box main body 100.

[0040] Among them, when the first welding assembly 4 is connected to the bottom of the frame body group 1, there is no need to punch a hole in the bottom of the frame body group 1, thereby avoiding the risk of airtight failure caused by punching a hole in the frame body group 1 in the prior art, or airtight failure in the FDS thread gap.

[0041] Exemplary First Welding Assembly

[0042] like Figure 2 As shown, further, some embodiments of the present invention provide a specific structure of the above-mentioned first welding assembly 4, where the first welding assembly 4 includes a welding rod 41, a welding seat 42, and a fixing member 43, wherein the welding seat 42 is mounted on the upper end of the welding rod 41, and is mounted on the bottom of the frame body group 1 by welding the welding rod 41 and the welding seat 42, and then the liquid cooling plate 2 is passed through the welding rod 41 and abutted against the welding seat 42 to connect, and then the fixing member 43 is passed through the welding rod 41 and abutted against the liquid cooling plate 2. Here, the welding rod 41 is set as a conical stud, and the fixing member 43 is set as a tightening nut, and the two are welded to the bottom of the frame body group 1 to achieve a sealing effect of the battery box body 100.

[0043] Furthermore, some embodiments of the present invention also have an airtight layer 11, where the airtight layer 11 is installed between the bottom of the liquid cooling plate 2 and the frame body group 1, so as to achieve sealing of the liquid cooling plate 2 and the frame body group 1, and the airtight layer 11 has a mounting hole corresponding to the welding seat 42, so that the welding seat 42 is passed through the airtight layer 11, thereby further achieving the sealing of multiple welding seats 42.

[0044] Example underbody guard

[0045] like Figure 3As shown, further, in some embodiments of the present invention, a bottom guard plate 20 is installed at the bottom of the above-mentioned liquid cooling plate 2, so that an inner cavity 201 is provided between the bottom guard plate 20 and the liquid cooling plate 2. The liquid cooling plate 2 includes a substrate 21 and a flow channel plate 22. The flow channel plate 22 is installed at the bottom of the substrate 21 and is located in the inner cavity 201. An inner guard plate 23 is also installed in the inner cavity 201. The flow channel plate 22 is located above the inner guard plate 23, so that the inner guard plate 23 is located between the flow channel plate 22 and the bottom guard plate 20. Since the flow channel plate 22 and the bottom guard plate 20 are both made of steel and the inner guard plate 23 is made of foam, the bottom guard plate 20 is prevented from directly contacting the flow channel plate 22 and causing scratches, and abnormal noise is reduced.

[0046] Furthermore, the flow channel plate 22 has a plurality of mutually connected flow channel recesses 24, and a cooling channel 25 is formed between the plurality of flow channel recesses 24 and the liquid cooling plate 2, and the cooling channel 25 has a coolant therein;

[0047] Among them, by stamping a plurality of flow channel recesses 24 on the flow channel plate 22, and then sealingly mounting the flow channel plate 22 to the bottom of the substrate 21 by brazing, a cooling channel 25 is formed between the flow channel recesses 24 and the liquid cooling plate 2, so that the heat generated by the battery pack unit (not shown) in the battery box body 100 can be taken away by pumping in circulating coolant, thereby achieving a heat dissipation effect.

[0048] like Figure 4 As shown, further, a control cabin 101 is also provided in the battery box body 100, where some control components are installed in the control cabin 101 to facilitate the charging and power generation management of the battery pack units; at the same time, a first liquid inlet pipe 28 and a first liquid outlet pipe 29 are also installed, which are connected to the cooling channel 25 through the first liquid inlet pipe 28 and the first liquid outlet pipe 29, and the first liquid inlet pipe 28 and the first liquid outlet pipe 29 are connected to the external circulation pump. The hidden design of the first liquid inlet pipe 28 and the first liquid outlet pipe 29 can prevent the coolant from leaking and affecting the heat dissipation effect.

[0049] Exemplary battery inner frame

[0050] like Figure 4As shown, further, in some embodiments of the present invention, a battery inner frame 30 is further installed in the battery box body 100, where the battery inner frame 30 is used to separate the battery box body 100 into a control cabin 101 and two battery compartments 102. Specifically, the battery inner frame 30 of the above structure includes two first inner beam frames 301 and a second inner beam frame 302, wherein the second inner beam frame 302 is installed between the two first inner beam frames 301, and the control cabin 101 is located between one of the first inner beam frames 301 and the frame body group 1. The battery inner frame 30 better facilitates the installation of the battery pack unit (not shown) inside the battery box body 100, greatly improving the efficiency of the use of the internal space.

[0051] Exemplary joint assemblies

[0052] like Figure 5-Figure 12 As shown, further, in some embodiments of the present invention, two joint assemblies 5 are also installed on the face frame 10 of the frame body group 1, where one of the joint assemblies 5 is used to connect the first liquid inlet pipe 28 with the external circulation pump, and the other joint assembly 5 is used to connect the first liquid outlet pipe 29 with the external circulation pump, thereby realizing the circulation connection between the external circulation pump and the first liquid inlet pipe 28 and the first liquid outlet pipe 29, wherein a corresponding internal cooling pipe is provided between the first liquid inlet pipe 28 and the first liquid outlet pipe 29 to realize the connection between the two and the joint assembly 5, and the joint assembly 5 has good airtight protection, and the joint assembly 5 can also be easily opened for maintenance. After regular maintenance of parts, it can prevent external water from entering the battery box body 100 when the car is wading.

[0053] like Figure 5 As shown, specifically, the joint assembly 5 of the structure includes an inner joint section 51 and a leak-proof insert 52, wherein the leak-proof insert 52 is installed in the surface frame 10 of the frame body assembly 1 (the surface frame 10 has a corresponding installation hole), and the leak-proof insert 52 is installed on the inner joint section 51, and the leak-proof insert 52 is also installed with an outer leak-proof cap 53, an inner leak-proof cap 54, a rotating mechanism 55, and an inner push-up mechanism 56, wherein the rotating mechanism 55 and the inner push-up mechanism 56 are connected. 6 is movably connected so that the inner push-up mechanism 56 is abutted and fixed on the two inner walls of the face frame 10, while the outer leak-proof cap 53 abuts the outer wall of the face frame 10 and wraps the rotating mechanism 55. The inner leak-proof cap 54 is installed on the inner end of the leak-proof insert 52 and abuts the inner wall of the face frame 10. In this way, the outer leak-proof cap 53 and the inner leak-proof cap 54 are abutted and fastened to the face frame 10, thereby achieving airtight fixation and preventing external water from entering the battery box main body 100.

[0054] Exemplary outer leak-proof cap

[0055] like Figure 6As shown, further, some embodiments of the present invention provide a specific structure of the above-mentioned outer leak-proof cap 53, where the outer leak-proof cap 53 of the structure includes an outer top plate 531, an inner top plate 532, and an intermediate wrapping tube 533, where the outer top plate 531 is installed on the outer end of the leak-proof insert 52 through a fastening rod 534, and the outer end of the leak-proof insert 52 has a fastening screw groove 520 corresponding to the fastening rod 534, and the intermediate wrapping tube 533 is installed between the outer top plate 531 and the inner top plate 532, and is sleeved on the leak-proof insert 52 to wrap the rotating mechanism 55, further, a plurality of first spring bodies 535 are also arranged between the outer top plate 531 and the inner top plate 532, where the first spring body 535 is a compression spring, and the plurality of first spring bodies 535 can provide a balanced pushing force for the inner top plate 532, so that the inner top plate 532 pushes against the outer wall of the face frame 10, thereby preventing airtightness failure and external water from entering the battery box body 100.

[0056] It is understandable that the inner anti-leakage cap 54 can adopt the same structure as the outer anti-leakage cap 53, so it will not be listed and described in detail.

[0057] Exemplary Rotation Mechanism

[0058] like Figure 5-Figure 6 As shown, further, some embodiments of the present invention provide a specific structure of the above-mentioned rotating mechanism 55, where the rotating mechanism 55 of this structure includes a first rotating ring 551 and a second rotating ring 552, and the first rotating ring 551 and the second rotating ring 552 are both rotatably mounted on the outer wall of the leak-proof insert 52, wherein the first rotating ring 551 is rotatably mounted in the threaded area 521 of the leak-proof insert 52, and the second rotating ring 552 is rotatably mounted on the leak-proof insert 52 and located on the inner side of the threaded area 521, and a plurality of first inner grooves 522 are provided in the threaded area 521, and a second inner groove 523 corresponding to the first inner groove 522 and internally connected to the inner groove is provided in the middle of the outer wall of the leak-proof insert 52, and the inner pushing mechanism 56 is installed in the first inner groove 522 and the second inner groove 523, and is movably connected to the first rotating ring 551 and the second rotating ring 552 respectively.

[0059] Therefore, after the leak-proof insert 52 is inserted and installed in the corresponding installation hole (not shown) in the face frame 10, the operator can operate the multiple first protrusions 5511 on the first rotating ring 551, thereby facilitating the first rotating ring 551 to rotate in the threaded area 521 and drive the inner push-up mechanism 56 to move. Then, by operating the multiple second protrusions 5521 on the second rotating ring 552, the inner push-up mechanism 56 is fixed to the face frame 10 under the rotation of the second rotating ring 552, thereby achieving fixed installation of the leak-proof insert 52.

[0060] Exemplary internal ejection mechanism

[0061] like Figure 7-11 As shown, further, some embodiments of the present invention provide a specific structure of the above-mentioned inner pushing mechanism 56, where the inner pushing mechanism 56 of the structure includes an L-shaped inner push rod 57 and an inner lifting assembly 58, wherein the L-shaped inner push rod 57 is movably installed in the first inner groove 522 and the second inner groove 523, and then the first rotating circle 551 can push against the L-shaped inner push rod 57, and by rotating the first rotating circle 551, the first rotating circle 551 can push the L-shaped inner push rod 57 in the first inner groove 522 to move into the second inner groove 523, where a wedge block 572 is provided on the inner end of the L-shaped inner push rod 57, so that the wedge block 572 acts on the inner lifting assembly 58, and the L-shaped inner push rod 57 is provided with a second spring body 571, and the second spring body 571 makes the L The movement of the inner ejector rod 57 is more stable, and the inner lifting assembly 58 is movably installed in the second inner groove 523 through the seat plate 524, so that the inner lifting assembly 58 moves to the outside of the second inner groove 523, so that the inner support guide plate 59 in the inner lifting assembly 58 is close to the two inner walls of the face frame 10, and then under the action of the second rotating circle 552, the two inner movable frame blocks 591 on the inner support guide plate 59 are movably driven to press against the two inner walls of the top face frame 10, where a bonding layer 594 is further provided on the inner movable frame block 591, and the bonding layer 594 makes the connection between the inner movable frame block 591 and the inner wall of the face frame 10 more secure, thereby realizing the fixed installation of the above-mentioned inner pushing mechanism 56 to the face frame 10, and also facilitating the subsequent maintenance or replacement of parts by opening the inner pushing mechanism 56.

[0062] Furthermore, the inner lifting component 58 also has a compound telescopic mechanism, and the bottom of the compound telescopic machine has a wedge surface 580 corresponding to the above-mentioned wedge block 572, so that the compound telescopic machine can push the inner support guide plate 59 outward; a plurality of slideways 590 are provided in the inner support guide plate 59, and the two inner movable frame blocks 591 can be movably mounted on the inner lifting component 58 through a screw 592, and the screw 592 is rotatably connected to the second rotating circle 552 through a knob 593. Here, the screw 592 is passed through the middle slideway 590, and the screw 592 has two threaded sections in opposite directions, so as to realize the mutual pulling in or moving away from each other between the two inner movable frame blocks 591, so that the inner movable frame block 591 is pressed against the inner wall of the face frame 10, wherein the inner support guide plate 59 is also provided with a spacer block 595, which is used to prevent the two inner movable frame blocks 591 from being too close to each other and causing slippage on the screw 592.

[0063] Exemplary composite telescopic mechanism

[0064] like Figure 12As shown, further, some embodiments of the present invention provide a specific structure of the above-mentioned composite telescopic mechanism, wherein the composite telescopic mechanism of the structure includes a third spring body 581, a first T-shaped rod 582, a first telescopic cylinder 583, a second T-shaped rod 584, a second telescopic cylinder 585, and a fourth spring body 586. Specifically, the first T-shaped rod 582 is invertedly installed in the first telescopic cylinder 583, and the bottom of the first telescopic cylinder 583 has the above-mentioned wedge surface 580, and the third spring body 581 is installed on the first T-shaped rod 582 and is located between the inner lifting assembly 58 and the seat plate 524. Further, the second T-shaped rod 584, the second telescopic cylinder 585, and the fourth spring body 586 are located in the first telescopic cylinder 583. , and the second T-shaped rod 584 is invertedly installed in the second telescopic cylinder 585, and the fourth spring body 586 is sleeved on the second T-shaped rod 584 and the second telescopic cylinder 585. Here, the second T-shaped rod 584 is connected to the first T-shaped rod 582, so after the wedge block 572 hits the wedge surface 580, the entire compound telescopic mechanism pushes the inner support guide plate 59 outward from the second inner groove 523, and then the compound telescopic mechanism continuously provides an outward thrust to the inner support guide plate 59 under the action of the third spring body 581 and the fourth spring body 586. Here, the inner support guide plate 59 hits the mounting hole of the face frame 10, and the inner support guide plate 59 also has an anti-distortion rod 596 passing through the seat plate 524, so that the inner support guide plate 59 moves outward smoothly.

[0065] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention.

[0066] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0067] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A battery box, characterized in that: include: A battery box body (100) comprises a frame body group (1), a liquid cooling plate (2), and an upper cover plate (3), wherein the liquid cooling plate (2) is arranged on the bottom of the frame body group (1) via a first welding assembly (4), and the upper cover plate (3) is arranged on the top of the frame body group (1) via a second welding assembly; The battery box body (100) further comprises a control cabin (101), wherein the control cabin (101) is provided with a first liquid inlet pipe (28) and a first liquid outlet pipe (29) which are in communication with the cooling channel (26), and the first liquid inlet pipe (28) and the first liquid outlet pipe (29) are in communication with an external circulation pump, and two joint assemblies (5) are further provided on the face frame (10) of the frame assembly (1), wherein one of the joint assemblies (5) is used for connecting the first liquid inlet pipe (28) to the external circulation pump, and the other joint assembly (5) is used for connecting the first liquid outlet pipe (29) to the external circulation pump; The joint assembly (5) includes an inner joint section (51) and a leak-proof insert (52), wherein the leak-proof insert (52) is arranged on the inner joint section (51), and an outer leak-proof cap (53), an inner leak-proof cap (54), a rotating mechanism (55), and an inner push-up mechanism (56) are arranged on the leak-proof insert (52), wherein the outer leak-proof cap (53) abuts against the outer wall of the surface frame (10) and wraps the rotating mechanism (55), and the rotating mechanism (55) is movably connected to the inner push-up mechanism (56) so that the inner push-up mechanism (56) abuts against the two inner walls of the surface frame (10), and the inner leak-proof cap (54) is arranged on the inner end of the leak-proof insert (52) and abuts against the inner wall of the surface frame (10); The outer leak-proof cap (53) comprises an outer top plate (531), an inner top plate (532), and an intermediate wrapping tube (533). The outer top plate (531) is arranged on the outer end of the leak-proof insert tube (52) via a fastening rod (534). The intermediate wrapping tube (533) is arranged between the outer top plate (531) and the inner top plate (532), and is sleeved on the leak-proof insert tube (52) to wrap the rotating mechanism (55). A plurality of first spring bodies (535) are further arranged between the outer top plate (531) and the inner top plate (532), so that the inner top plate (532) presses against the outer wall of the surface frame (10).

2. A battery box according to claim 1, characterized in that: The first welding assembly (4) comprises a welding rod (41), a welding seat (42), and a fixing member (43); the welding seat (42) is arranged at the upper end of the welding rod (41); the upper end of the welding rod (41) is welded to the bottom of the frame body assembly (1); the liquid cooling plate (2) is connected to the welding seat (42), and the fixing member (43) is passed through the welding rod (41) and abuts against the liquid cooling plate (2).

3. A battery box according to claim 2, characterized in that: Also includes: An airtight layer (11), the airtight layer (11) is arranged between the liquid cooling plate (2) and the bottom of the frame body group (1), and the welding seat (42) is penetrated in the airtight layer (11).

4. A battery box according to claim 1, characterized in that: The bottom of the liquid cooling plate (2) is provided with a bottom guard plate (20), an inner cavity (201) is provided between the bottom guard plate (20) and the liquid cooling plate (2), the liquid cooling plate (2) comprises a base plate (21), a flow channel plate (22), the inner cavity (201) is further provided with an inner guard plate (24), and the flow channel plate (22) is located above the inner guard plate (24), the flow channel plate (22) has a plurality of flow channel recesses (25), and a cooling channel (26) is provided between the plurality of flow channel recesses (25) and the liquid cooling plate (2), wherein the cooling channel (26) has a coolant.

5. A battery box according to claim 1, characterized in that: A battery inner frame (30) is further configured in the battery box body (100), and the battery inner frame (30) divides the battery box body (100) into a control compartment (101) and two battery compartments (102).

6. A battery box according to claim 5, characterized in that: The battery inner frame (30) comprises two first inner beam frames (301) and a second inner beam frame (302); the second inner beam frame (302) is arranged between the two first inner beam frames (301); and a control cabin (101) is located between one of the first inner beam frames (301) and the frame body group (1).

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