Battery pack lower box body, battery pack and vehicle

Abstract

The utility model provides a battery pack lower box body, a battery pack and a vehicle. The battery pack lower box body comprises a liquid cooling plate, the connector is arranged on the liquid cooling plate and is provided with a liquid inlet channel and a liquid outlet channel which are communicated with the flow channel of the liquid cooling plate; and the frame body is provided with a frame surrounding the liquid cooling plate, the bottom of the frame is provided with a clamping groove for embedding the edge part of the liquid cooling plate, and the frame corresponding to one side of the joint is provided with an insertion through groove for inserting part of the joint. In this way, the liquid cooling plate, the connector and the frame body can be accurately assembled, and the assembled lower box body has good assembling precision.

Description

Technical Field

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

[0002] The lower box of the battery pack includes a frame and a liquid cooling plate. The liquid cooling plate is arranged at the bottom of the frame, thereby playing the role of supporting the battery cells. In the related art, the edge of the liquid cooling plate and the edge of the bottom of the frame need to be sealed and connected by welding, so that the frame and the liquid cooling plate are combined to form a storage groove for placing battery cells and related electrical components. At the same time, a joint is provided on the liquid cooling plate, through which the cooling medium is transported to the liquid cooling plate. In order to ensure the sealing of the battery pack, the joint and the frame and the liquid cooling plate also need to be sealed and connected by welding. Therefore, before the welding operation is carried out, higher requirements are put forward for the assembly accuracy between the joint, the frame and the liquid cooling plate to ensure that the lower box has good sealing after welding. However, when the existing joint, the frame and the liquid cooling plate are assembled, due to the complex connection form, the assembly accuracy of the lower box after assembly is not high, and there is a situation where the sealing is unqualified due to the low accuracy after assembly. Utility Model Content

[0003] In view of this, an object of the present invention is to provide a battery pack lower box, a battery pack and a vehicle, so as to improve the assembly accuracy of the lower box, so as to at least partially solve the problems in the related art.

[0004] Based on the above objectives, the first aspect of the present invention provides a battery pack lower box, comprising:

[0005] Liquid cooling plate;

[0006] a connector, disposed on the liquid cooling plate and having a liquid inlet channel and a liquid outlet channel communicating with the flow channel of the liquid cooling plate;

[0007] The frame body has a frame arranged around the liquid cooling plate, and the bottom of the frame is provided with a clamping groove for the edge of the liquid cooling plate to be embedded. The frame corresponding to the side of the joint is provided with a plug-in groove for plugging part of the joint.

[0008] Optionally, the connector includes a fixedly connected connecting portion and a mounting portion, the mounting portion is disposed in the plug-in slot, and the connecting portion has a first positioning surface contacting the outer wall surface of the frame on a side close to the mounting portion.

[0009] Optionally, the bottoms of the connecting portion and the mounting portion are provided with positioning grooves for clamping the liquid cooling plate.

[0010] Optionally, a liquid inlet connecting pipe communicating with the liquid inlet channel and a liquid discharge connecting pipe connected to the liquid discharge channel are provided on a side wall surface of the connecting portion facing away from the mounting portion.

[0011] Optionally, a liquid inlet pipe and a liquid discharge pipe are provided on the bottom surface of the positioning groove, a first socket for the liquid inlet pipe to extend into the flow channel is provided on the liquid cooling plate, and a second socket for the liquid discharge pipe to extend into the flow channel is provided on the liquid cooling plate, the liquid inlet pipe, the liquid inlet connecting pipe and the liquid inlet channel are interconnected, and the liquid discharge pipe, the liquid discharge connecting pipe and the liquid discharge channel are interconnected.

[0012] Optionally, connecting pieces are provided on the outer wall surface of the liquid inlet connecting pipe and the outer wall surface of the liquid discharge connecting pipe.

[0013] Optionally, a connecting ear plate is further included, wherein the connecting ear plate is arranged on the side wall surface of the connecting portion and has a second positioning surface contacting the frame.

[0014] Optionally, the end of the mounting portion facing away from the positioning groove has a first mounting surface, and the bottom surface of the plug-in through groove matches the edge profile of the first mounting surface.

[0015] A second aspect of the present invention further provides a battery pack, comprising the battery pack lower box and cover plate as described in the first aspect;

[0016] The cover plate is sealed and connected to the lower box of the battery pack to enclose and form a storage cavity for storing battery cells.

[0017] The third aspect of the present invention further provides a vehicle, comprising the battery pack as described in the second aspect.

[0018] Through the above technical solution, the frame is arranged around the liquid cooling plate and the bottom of the frame is provided with a snap-in groove for the edge of the liquid cooling plate to be engaged, thereby meeting the assembly accuracy between the frame and the liquid cooling plate. When the liquid cooling plate is engaged in the snap-in groove, the interval gap between the frame and the liquid cooling plate is the welding part, and the gap here is sealed by welding to ensure the connection sealing between the frame and the liquid cooling plate. At the same time, the frame is also provided with a plug-in groove for some plug-in connectors, which can play a positioning role for the connector. Under the coordinated action of the snap-in groove and the plug-in groove, the liquid cooling plate connected with the connector can be accurately assembled with the frame body, providing a good welding foundation for subsequent welding operations, and eliminating the occurrence of unqualified sealing after welding due to low assembly precision.

[0019] Other features and advantages of the present invention will be described in detail in the subsequent detailed description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 is a structural schematic diagram of a lower box provided in an exemplary embodiment of the present utility model;

[0022] Figure 2 is a schematic structural diagram of the liquid cooling plate and the joint provided in an exemplary embodiment of the present invention when separated;

[0023] Figure 3 1 is a schematic structural diagram of the liquid cooling plate and the joint during assembly provided in an exemplary embodiment of the present invention;

[0024] Figure 4 yes Figure 3 A partial enlarged schematic diagram of position A in the middle;

[0025] Figure 5 This is a schematic structural diagram of a joint and a frame after welding provided in an exemplary embodiment of the present utility model;

[0026] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure at the AA position;

[0027] Figure 7 is a schematic structural diagram of a frame provided in an exemplary embodiment of the present utility model;

[0028] Figure 8 is a bottom view structural diagram of the lower box provided in an exemplary embodiment of the present utility model;

[0029] Figure 9 Schematic diagram of the structure of the connector provided in an exemplary embodiment of the present invention.

[0030] Description of Reference Numerals

[0031] 1-Liquid cooling plate; 101-First socket; 102-Second socket; 103-Flow channel; 2-Connector; 201-Liquid inlet channel; 202-Liquid discharge channel; 203-Connecting portion; 2031-First positioning surface; 2032-Positioning groove; 204-Mounting portion; 2041-First mounting surface; 3-Frame; 301-Card slot; 302-Plug-in slot; 4-Liquid inlet connecting pipe; 5-Liquid discharge connecting pipe; 6-Liquid inlet pipe; 7-Liquid discharge pipe; 8-Connecting piece; 9-Connecting ear plate; 901-Second positioning surface; 10-MIG weld; 11-FSW weld. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0033] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present invention should have the usual meanings understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0034] In related technologies, welding is used to achieve a sealed connection between the liquid cooling plate and the frame, as well as a sealed connection between the joint and the frame, thereby ensuring the structural integrity of the lower box of the battery pack. However, due to the complex assembly form between the joint, frame and liquid cooling plate, the assembly accuracy before welding is difficult to control, which affects the sealing effect of the lower box.

[0035] Based on this, the first aspect of the present invention provides a battery pack lower box, referring to Figures 1 to 9 As shown, the lower box of the battery pack includes: a liquid cooling plate 1, a connector 2 and a frame body, wherein the connector 2 is arranged on the liquid cooling plate 1 and has a liquid inlet channel 201 and a liquid discharge channel 202 connected to the flow channel 103 of the liquid cooling plate 1, and the frame body has a frame 3 arranged around the liquid cooling plate 1 and the bottom of the frame 3 is provided with a snap-in groove 301 for the edge of the liquid cooling plate 1 to be embedded, and the frame 3 corresponding to the side of the connector 2 is provided with a plug-in groove 302 for plugging in part of the connector 2.

[0036] Through the above technical solution, the frame 3 is arranged around the liquid cooling plate 1 and the bottom of the frame 3 is provided with a snap-in groove 301 for the edge of the liquid cooling plate 1 to be engaged, thereby meeting the assembly accuracy between the frame 3 and the liquid cooling plate 1. When the liquid cooling plate 1 is engaged in the snap-in groove 301, the interval gap between the frame 3 and the liquid cooling plate 1 is the welding part, and the gap here is sealed by welding to ensure the connection sealing between the frame 3 and the liquid cooling plate 1. At the same time, the frame 3 is also provided with a plug-in groove 302 for partially plugging the connector 2. The plug-in groove 302 can play a positioning role for the connector 2. Under the coordinated action of the snap-in groove 301 and the plug-in groove 302, the liquid cooling plate 1 connected with the connector 2 can be accurately assembled with the frame body, providing a good welding foundation for subsequent welding operations, and eliminating the occurrence of unqualified sealing after welding due to low assembly accuracy.

[0037] In some embodiments, reference Figure 4 、 Figure 6 、 Figure 7 and Figure 9 As shown, the connector 2 includes a fixed connecting portion 203 and a mounting portion 204, wherein the mounting portion 204 is inserted into the plug-in slot 302, and the connecting portion 203 has a first positioning surface 2031 that contacts the outer wall of the frame 3 on the side close to the mounting portion 204. After the liquid cooling plate 1 with the connector 2 installed and the frame 3 are assembled, the operator can observe the assembled lower box of the battery pack to determine whether the assembly has good assembly accuracy, that is, when the mounting portion 204 is inserted into the plug-in slot 302, the liquid cooling plate 1 should be embedded in the snap-in slot 301, and the first positioning surface 2031 should fit the outer wall of the frame 3. If the first positioning surface 2031 cannot fit the outer wall of the frame 3 or the liquid cooling plate 1 fails to fit well in the snap-in slot 301, the assembly is unqualified.

[0038] In some embodiments, reference Figure 6 and Figure 9As shown, the bottom of the connecting portion 203 and the mounting portion 204 is provided with a positioning groove 2032 for clamping the liquid cooling plate 1, that is, when the liquid cooling plate 1 with the joint 2 installed is assembled with the frame 3, the lower box body with good assembly accuracy should meet the requirements of the liquid cooling plate 1 being embedded in the clamping groove 301, the first positioning surface 2031 being in contact with the outer wall surface of the frame 3, and the side wall surface of the positioning groove 2032 being in contact with the side wall surface of the liquid cooling plate 1, wherein the role of the first positioning surface 2031 is to provide a reference for visual verification. During the assembly process, the operator can observe whether the first positioning surface 2031 is tightly in contact with the frame 3. The outer wall is used to judge the assembly accuracy; under the coordinated action of the mounting portion 204 and the plug-in slot 302, the assembly process is relatively fast and efficient. The plug-in slot 302 not only provides a position guide for the connector 2, but also reduces assembly errors. On this basis, in order to be able to visually verify the assembly accuracy between the liquid cooling plate 1 and the connector 2, a positioning slot 2032 is provided at the bottom of the connecting portion 203 and the mounting portion 204. The side wall surface of the positioning slot 2032 can be snap-fitted with the side wall surface of the liquid cooling plate 1. The provision of the positioning slot 2032 can effectively ensure good assembly accuracy between the liquid cooling plate 1 and the connector 2.

[0039] Through the multiple positioning design in the above embodiment (including the plug-in slot 302, the snap-in slot 301, the first positioning surface 2031 and the positioning slot 2032), the assembly accuracy of the lower box body will be greatly improved, avoiding the common situation of unqualified sealing due to inaccurate assembly before welding. At the same time, the multiple positioning design simplifies the operation process while ensuring the assembly accuracy, improves the assembly efficiency, and enables the lower box body to be assembled with high precision in a short time.

[0040] In some embodiments, the joint 2 has a liquid inlet channel 201 and a liquid discharge channel 202 connected to the flow channel 103 of the liquid cold plate 1, wherein a liquid inlet connecting pipe 4 connected to the liquid inlet channel 201 and a liquid discharge connecting pipe 5 connected to the liquid discharge channel 202 are provided on the side wall surface of the connecting portion 203 of the joint 2 away from the mounting portion 204, and the outer wall surface of the liquid inlet connecting pipe 4 and the outer wall surface of the liquid discharge connecting pipe 5 are both provided with a connector 8, that is, reference Figure 5 、 Figure 6 and Figure 9As shown, the connecting member 8 includes a plurality of ring plates, which are arranged at equal intervals along the axial direction of the liquid inlet connecting pipe 4 or the axial direction of the liquid discharge connecting pipe 5. An annular groove for placing a sealing ring is formed between two adjacent ring plates. The liquid supply hose is sleeved on the liquid inlet connecting pipe 4 and fixed to the liquid inlet connecting pipe 4 by a hoop. The sealing ring arranged on the liquid inlet connecting pipe 4 plays a sealing role to prevent the cooling medium from overflowing from the gap between the liquid supply hose and the liquid inlet connecting pipe 4; the drain hose for extracting the cooling medium is sleeved on the drain connecting pipe 5, and fixed to the drain connecting pipe 5 by a hoop. The sealing ring arranged on the drain connecting pipe 5 plays a sealing role to prevent the cooling medium from overflowing from the gap between the drain hose and the drain connecting pipe 5.

[0041] In some embodiments not shown in the figures, the connector 8 is constructed as an external thread, and the liquid supply hose is installed on the liquid inlet connecting pipe 4 and the liquid discharge hose is installed on the liquid discharge connecting pipe 5 through a professional connector.

[0042] In some embodiments, the liquid supply hose and the liquid discharge hose are part of a coolant circulation system, wherein the coolant circulation system further includes a cooling pump and a heat exchanger, the liquid inlet of the cooling pump and the liquid outlet of the heat exchanger are connected by a connecting pipe, one end of the liquid discharge hose is connected to the liquid discharge connecting pipe 5, and the other end is connected to the liquid inlet of the heat exchanger, and the liquid outlet of the cooling pump is connected to the liquid inlet connecting pipe 4 through the liquid supply hose. The cooling pump is responsible for pushing the cooling medium to flow in the flow channel 103 of the liquid cold plate 1. After flowing in the liquid cold plate 1, the cooling medium absorbs the heat generated inside the battery pack. After absorbing heat, the cooling medium passes through the drain channel 202 of the connector 2 and flows to the heat exchanger through the drain hose. After releasing heat in the heat exchanger, the cooling medium is cooled again, and then, under the transportation of the cooling pump, flows back to the flow channel 103 of the liquid cold plate 1 through the liquid supply hose and the liquid inlet channel 201 of the connector 2, forming a cycle.

[0043] In some embodiments, reference Figure 2 、 Figure 3 、 Figure 4 、 Figure 6 and Figure 9As shown, a liquid inlet pipe 6 and a liquid drain pipe 7 are provided on the bottom surface of the positioning groove 2032, and a first plug hole 101 for the liquid inlet pipe 6 to extend into the flow channel 103 of the liquid cooling plate 1 is provided on the liquid cooling plate 1, and a second plug hole 102 for the liquid drain pipe 7 to extend into the flow channel 103 of the liquid cooling plate 1 is provided on the liquid cooling plate 1. In order to ensure the stability of the plugging, the liquid inlet pipe 6 and the first plug hole 101 are interference fit, and the liquid drain pipe 7 and the second plug hole 102 are interference fit; the liquid inlet pipe 6, the liquid inlet connecting pipe 4 and the liquid inlet channel 201 are interconnected, and the liquid drain pipe 7, the liquid drain connecting pipe 5 and the liquid drain channel 202 are interconnected. The cooling medium is connected in a manner such that the cooling medium from the liquid supply hose flows sequentially through the liquid inlet connecting pipe 4, the liquid inlet channel 201 and the liquid inlet pipe 6, and reaches the flow channel 103 of the liquid cold plate 1; the cooling medium after absorbing the heat generated by the battery pack flows sequentially through the discharge pipe 7, the discharge channel 202 and the discharge connecting pipe 5, and is discharged to the heat exchanger through the discharge hose for heat exchange, thereby cooling the cooling medium. Then, under the transportation of the cooling pump, the cooling medium flows sequentially through the liquid inlet connecting pipe 4, the liquid inlet channel 201 and the liquid inlet pipe 6 through the liquid supply hose, and reaches the flow channel 103 of the liquid cold plate 1, thus forming a cycle.

[0044] In some embodiments, reference Figure 2 、 Figure 3 、 Figure 4 and Figure 9 As shown, after the connector 2 and the liquid cooling plate 1 are assembled, the bottom surface of the positioning groove 2032 must be in contact with the upper surface of the liquid cooling plate 1, and the liquid inlet pipe 6 must be inserted into the first socket 101, and the liquid discharge pipe 7 must be inserted into the second socket 102. At the same time, it is also necessary to ensure that the side wall surface of the positioning groove 2032 is in contact with the side wall surface of the liquid cooling plate 1. Through this precise assembly method, not only is the assembly accuracy between the connector 2 and the liquid cooling plate 1 improved, but also a reliable connection is provided for the circulation of the cooling medium in the flow channel 103 of the liquid cooling plate 1.

[0045] In some embodiments, in order to ensure the connection strength between the joint 2 and the frame 3, a connecting ear plate 9 can be provided on the side wall surface of the connecting portion 203, wherein the number of the connecting ear plates 9 is two, and the connecting ear plates 9 are arranged opposite to each other, and each connecting ear plate 9 has a second positioning surface 901. When the liquid cooling plate 1 with the joint 2 is assembled with the frame body, Figure 1 As shown, the second positioning surface 901 and the first positioning surface 2031 are both in contact with the outer wall of the frame 3. After the operator has checked the assembly accuracy, the welding operation can be started. Figure 5 and Figure 9 As shown, the gap between the connecting portion 203 and the frame 3 and the gap between the connecting ear plate 9 and the frame 3 need to be welded (using MIG welding, Metal Inert Gas Welding, Metal Inert Gas Shielded Welding) and sealed (sealed by MIG weld 10).

[0046] In some embodiments, Figure 6 and Figure 8 As shown, after the liquid cooling plate 1 with the joint 2 is assembled with the frame body and the operator has checked the assembly accuracy, in addition to welding the gap between the joint 2 and the frame 3, the gap between the liquid cooling plate 1 and the frame body needs to be welded (FSW welding Friction Stir Welding, stir friction welding) and sealed (sealed by FSW weld 11). It should be noted that, Figure 2 and Figure 8 As shown, based on different welding processes, the gap between the portion of the liquid cooling plate 1 connecting the joint 2 and the side wall of the snap-fit ​​groove 301 can be MIG welded, thereby sealing the gap between the portion of the liquid cooling plate 1 connecting the joint 2 and the side wall of the snap-fit ​​groove 301 through the MIG weld 10, thereby ensuring that this portion has good sealing performance.

[0047] In some embodiments, after the liquid cooling plate 1 with the joint 2 installed is assembled with the frame body and the operator has checked the assembly accuracy, it is also necessary to weld the bottom surface of the positioning groove 2032 and the upper surface of the liquid cooling plate 1 by brazing, that is, after applying brazing flux on the bottom surface of the positioning groove 2032, the liquid inlet pipe 6 is inserted into the first socket 101 and the liquid discharge pipe 7 is inserted into the second socket 102, and then the assembly accuracy is checked. After the inspection is completed, it is sent to the brazing furnace to complete the brazing.

[0048] The assembly and welding process for the lower box is described as follows:

[0049] Before assembling the joint 2 and the liquid cooling plate 1, it is necessary to first apply brazing flux on the bottom surface of the positioning groove 2032, and then assemble the joint 2 and the liquid cooling plate 1. After the assembly is completed and the assembly accuracy of the joint 2 and the liquid cooling plate 1 is checked, it is sent to the brazing furnace to complete the brazing, and then the liquid cooling plate 1 with the joint 2 installed is assembled with the frame 3. After the assembly is completed, the operator checks the assembly accuracy and can start the welding operation after confirming that it is correct. According to different welding parts, different welding methods can be selected to weld the lower box body to ensure the overall sealing of the lower box body. When welding, the gap between the liquid cooling plate 1 and the frame 3 can be welded first, and then the gap between the joint 2 and the frame 3 can be welded. After all welding operations are completed, the operator needs to conduct a comprehensive inspection of the welding quality to ensure that the sealing of the lower box body is good.

[0050] In some embodiments, reference Figure 6As shown, the end of the mounting portion 204 facing away from the positioning groove 2032 has a first mounting surface 2041, and the bottom surface of the plug-in groove 302 matches the edge contour of the first mounting surface 2041, that is, when the liquid cooling plate 1 with the joint 2 installed is assembled with the frame body, the bottom surface of the plug-in groove 302 matches the edge contour of the first mounting surface 2041, so that the bottom surface of the plug-in groove 302 can fit tightly with the first mounting surface 2041, thereby ensuring the assembly accuracy and tightness between the joint 2 and the frame 3. When the bottom surface of the plug-in groove 302 fits tightly with the first mounting surface 2041, the movement of the joint 2 and the liquid cooling plate 1 can be effectively prevented. In addition, during the assembly process of the joint 2, the operator judges the assembly accuracy by checking the fit between the bottom surface of the plug-in groove 302 and the first mounting surface 2041. If the two surfaces are not completely fit, subsequent welding deviation and sealing failure may result.

[0051] Therefore, the tight fit between the bottom surface of insertion slot 302 and first mounting surface 2041 not only ensures mechanical stability between connector 2 and the frame body, but also provides a good foundation for welding. When the assembly precision between connector 2 and the frame body is guaranteed, subsequent welding operations can be performed in a stable environment, reducing deviations caused by thermal deformation during welding and ensuring excellent sealing and strength of the overall structure after welding.

[0052] Based on the above technical solution, the second aspect of the present invention also provides a battery pack, including the battery pack lower box and cover of the above first aspect or any embodiment of the above first aspect, the cover is sealed and connected to the battery pack lower box to enclose and form a storage cavity for accommodating battery cells.

[0053] Based on the above technical solution, the third aspect of the present invention further provides a vehicle including the battery pack of the second aspect. The vehicle can be, for example, a new energy vehicle or a hybrid vehicle, and has all the benefits of the above battery pack. The present invention will not be further elaborated here.

[0054] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0055] The embodiments of the present invention are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery pack lower box, characterized in that: include: Liquid cooling plate; a connector, disposed on the liquid cooling plate and having a liquid inlet channel and a liquid outlet channel communicating with the flow channel of the liquid cooling plate; The frame body has a frame arranged around the liquid cooling plate, and the bottom of the frame is provided with a clamping groove for the edge of the liquid cooling plate to be embedded. The frame corresponding to the side of the joint is provided with a plug-in groove for plugging part of the joint.

2. The battery pack lower box according to claim 1, characterized in that: The joint includes a fixedly connected connecting portion and a mounting portion, the mounting portion is arranged in the plug-in slot, and the connecting portion has a first positioning surface contacting the outer wall surface of the frame on a side close to the mounting portion.

3. The battery pack lower box according to claim 2, characterized in that: The bottoms of the connecting portion and the mounting portion are provided with positioning grooves for clamping the liquid cooling plate.

4. The battery pack lower box according to claim 3, characterized in that: A liquid inlet connecting pipe communicating with the liquid inlet channel and a liquid discharge connecting pipe connected with the liquid discharge channel are provided on a side wall surface of the connecting portion on a side away from the mounting portion.

5. The battery pack lower box according to claim 4, characterized in that: A liquid inlet pipe and a liquid drain pipe are provided on the bottom surface of the positioning groove, a first jack for the liquid inlet pipe to extend into the flow channel is provided on the liquid cooling plate, and a second jack for the liquid drain pipe to extend into the flow channel is provided on the liquid cooling plate, the liquid inlet pipe, the liquid inlet connecting pipe and the liquid inlet channel are communicated with each other, and the liquid drain pipe, the liquid drain connecting pipe and the liquid drain channel are communicated with each other.

6. The battery pack lower box according to claim 4, characterized in that: Connecting pieces are provided on the outer wall surface of the liquid inlet connecting pipe and the outer wall surface of the liquid discharge connecting pipe.

7. The battery pack lower box according to claim 2, characterized in that: It also includes a connecting ear plate, which is arranged on the side wall surface of the connecting portion and has a second positioning surface that contacts the frame.

8. The battery pack lower box according to claim 3, characterized in that: The end of the mounting portion facing away from the positioning groove has a first mounting surface, and the bottom surface of the plug-in through groove matches the edge profile of the first mounting surface.

9. A battery pack, characterized in that: Comprising the battery pack lower box and cover according to any one of claims 1 to 8; The cover plate is sealed and connected to the lower box of the battery pack to enclose and form a storage cavity for storing battery cells.

10. A vehicle, characterized in that: The battery pack according to claim 9 is included.

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