Battery modules, battery packs and electrical devices

Abstract

The embodiments of the present application provide a battery module, a battery pack, and an electrical device. The battery module includes a plurality of stacked battery cells and a busbar. The battery cell includes a first surface, on which a pole is provided. The busbar is provided with a mounting groove, and the busbar electrically connects adjacent battery cells by slidingly connecting the poles through the mounting groove. The battery module proposed in the present application achieves the connection between the battery cell and the busbar by a sliding connection, thereby avoiding the safety risks caused by welding slag splashing and residue in the existing welding process, and improving the safety of the battery module.

Description

Technical Field

[0001] The present application relates to the field of power batteries, and more specifically, to a battery module, a battery pack, and an electrical device. Background Art

[0002] In the context of energy conservation and emission reduction, battery technology has developed rapidly due to its energy-saving characteristics and is widely used in various vehicles.

[0003] In this existing battery structure design, laser welding and other methods are usually used to fix the battery cells in the battery module. Although this method is strong and reliable, the welding slag generated will fall into the battery module, posing a risk of high-voltage breakdown when the battery is in use. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a battery module, a battery pack and an electrical device to achieve the technical effect of improving the safety of the battery module.

[0005] In the first aspect, an embodiment of the present application provides a battery module comprising a plurality of stacked battery cells and a busbar, wherein the battery cell comprises a first surface on which a pole is provided, and a busbar having an installation groove, wherein the busbar electrically connects adjacent battery cells by slidingly connecting the poles through the installation groove.

[0006] The technical solution of the embodiment of the present application avoids the risk of high-voltage breakdown caused by welding slag generated during the welding process by connecting the battery cell and the busbar in a sliding connection, thereby improving the safety of the battery module. At the same time, the simpler structure also optimizes the installation process, reduces the installation difficulty, and improves the installation efficiency.

[0007] In some embodiments, a positioning groove is provided on the pole, a positioning protrusion is provided in the mounting groove, and the positioning protrusion is accommodated in the positioning groove.

[0008] In some embodiments, an inclined transition surface is provided on the pole, and the transition surface connects the positioning groove and the first surface.

[0009] In some embodiments, a positioning portion is provided at one end of the pole facing away from the first surface, and a side of the positioning portion facing the current collector is a partial ellipsoid.

[0010] In some embodiments, an integrated board is further included, wherein the integrated board is connected to the busbar.

[0011] In some embodiments, a liquid cooling plate is further included, wherein the liquid cooling plate is connected to the integrated plate, and the liquid cooling plate and the busbar are respectively arranged on both sides of the integrated plate.

[0012] In some embodiments, a temperature averaging plate is further included, wherein the temperature averaging plate is arranged between adjacent battery cells, and the temperature averaging plate is provided with supporting feet, and the supporting feet are connected to the liquid cooling plate.

[0013] In some embodiments, a heat conducting portion is provided on the current collector, and the heat conducting portion protrudes toward the integrated board. A recessed portion is provided on the integrated board, and the recessed portion accommodates the heat conducting portion.

[0014] In a second aspect, a battery pack is provided, comprising a housing and the battery module of the first aspect.

[0015] In a third aspect, an electrical device is provided, comprising the battery pack of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic structural diagram of a battery module provided in an embodiment of the present application;

[0018] Figure 2 for Figure 1 A schematic diagram of the structure of the battery cells in the battery module shown;

[0019] Figure 3 for Figure 1 Schematic diagram of the connection between the battery cells and the busbar in the battery module shown;

[0020] Figure 4 for Figure 1 Schematic diagram of the bottom structure of the integrated board in the battery module shown;

[0021] Figure 5 for Figure 1 Schematic diagram of the internal structure of the battery module shown.

[0022] Icons: 100-battery module; 10-battery cell; 11-pole; 111-positioning part; 112-positioning groove; 113-transition surface; 20-integrated board; 21-manifold; 211-mounting groove; 212-positioning protrusion; 213-heat conducting part; 23-FPC assembly; 24-recessed part; 30-insulating limit block; 40-liquid cooling plate; 41-water channel; 50-temperature averaging plate; 51-support foot. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0024] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0025] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0027] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0028] In this application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and the embodiments of this application are not limited thereto. The battery cell may be flat, rectangular, or in other shapes, and the embodiments of this application are not limited thereto.

[0029] The battery module mentioned in the embodiments of the present application includes a plurality of battery cells and a busbar, and the busbar is used to realize electrical connection between the plurality of battery cells, such as parallel connection, series connection or mixed connection.

[0030] The battery pack referred to in the embodiments of the present application is a packaging structure that integrates one or more battery modules. This structure is conducive to the management, charge and discharge control, and installation and setting of the battery modules.

[0031] In existing battery module designs, laser welding is usually used to fix the battery module. During this process, welding slag is inevitably generated, which may change the connection relationship between battery cells or the properties of the space between battery cells, making it possible to break down under high voltage and thus cause thermal runaway.

[0032] Prior art battery modules also utilize a harmonica tube liquid cooling plate to dissipate heat from the battery cells via a thermal pad. This design is simple, technically mature, and economical, but it also has some drawbacks: only one side of the liquid cooling plate contacts the thermal pad, limiting heat dissipation efficiency; the bottom of the battery cell (the end away from the terminal) is close to the liquid cooling plate, while the terminal end generates more heat, resulting in uneven heat distribution and large temperature differences, which in turn affects power and service life; and the harmonica tube liquid cooling plate is typically extruded, making it difficult to maintain flatness when the length is long, resulting in poor contact between the heat dissipation surface and reduced heat dissipation efficiency.

[0033] The above-mentioned defects will have varying degrees of adverse effects on the safety, performance, and service life of the battery module. In view of this, the present application provides a technical solution that improves the safety performance of the battery module through an inverted and sliding connection method, while optimizing the layout of the various components in the battery module, improving space utilization, energy density, and heat dissipation performance.

[0034] The technical solutions described in the embodiments of this application can be used in many application scenarios using batteries, such as electric vehicles, electric ships, and spacecraft.

[0035] See also Figures 1 to 4 , a battery module 100 provided in an embodiment of the present application, comprising a plurality of stacked battery cells 10 and a busbar 21, wherein the battery cell 10 comprises a first surface, the first surface being as shown Figure 2On the top surface of the middle cell, a pole 11 is provided on the first surface, and a busbar 21 is provided with a mounting groove 211 . The busbar 21 is electrically connected to the adjacent cells 10 by slidingly connecting to the pole 11 through the mounting groove 211 .

[0036] In this embodiment, the installation direction is Figure 1 In the direction indicated by direction A in FIG, multiple battery cells 10 are sequentially slidably inserted into the installation slots 211 from direction A. Therefore, the battery module 100 further includes an insulating stopper 30 that can be slidably inserted into the installation slots 211. After each battery cell 10 is installed, the insulating stopper 30 is inserted to secure the battery cell 10. At the same time, the insulating stopper 30 can also prevent accidental contact between the poles 11 that do not need to be electrically connected, reducing the risk of abnormalities.

[0037] In one embodiment, a positioning groove 112 is defined on the pole 11 , a positioning protrusion 212 is defined in the mounting groove 211 , and the positioning protrusion 212 is received in the positioning groove 112 .

[0038] In this embodiment, the busbar 21 is made of copper to meet the requirements of low weight and good conductivity. Furthermore, because the sliding connection involves high-intensity and high-frequency frictional contact, the contact surface of the busbar 21 near the pole 11 can be nickel-plated to improve wear resistance. This prevents frequent sliding and plugging that could cause deformation of the mounting slot 211 and prevent the pole 11 from being fixed, while still ensuring the electrical connection with the pole 11.

[0039] In the embodiment of the present application, a mounting groove 211 is provided on the busbar 21 to be slidably connected with the pole 11 on the battery cell 10, thereby achieving plug-in installation and fixation of the battery cell 10, avoiding the risks brought by welding slag generated in the welding connection, and improving the safety and assembly efficiency of the battery module 100.

[0040] Please continue reading Figure 2 The positioning groove 112 on the pole 11 is recessed inward, and a positioning protrusion 212 is provided on the mounting groove 211. The positioning protrusion 212 corresponds in shape to the positioning groove 112 and can abut against the positioning groove 112, thereby limiting the vertical position of the pole 11 within the mounting groove 211. The inward recess of the positioning groove 112 is formed into an arcuate surface. The arcuate surface structure of the positioning groove 112 can reduce the contact area with the positioning protrusion 212, thereby facilitating the sliding and disassembly of the pole 11 within the current collector 21.

[0041] In one embodiment, an inclined transition surface is provided on the pole 11, connecting the positioning groove 112 and the first surface. In this embodiment, the transition surface 113 from the positioning groove 112 to the first surface is an inclined plane. The provision of the inclined plane is also to facilitate the sliding installation of the pole 11 and reduce the difficulty of disassembly.

[0042] The arc-shaped positioning groove 112 and the inclined transition surface 113 together create a gap between the pole 11 and the installation groove 211 , thereby avoiding jamming during installation and improving installation efficiency.

[0043] In one embodiment, a positioning portion 111 is provided at one end of the pole 11 away from the first surface. The side of the positioning portion 111 facing the current bus 21 is a partial ellipsoid.

[0044] The positioning portion 111 can be embedded in the space between the positioning protrusion 212 and the vertical wall of the mounting groove 211, thereby limiting the four degrees of freedom of the pole 11 perpendicular to the direction A, namely the front, back, top, and bottom directions, to further secure the battery cell 10 and prevent the battery cell 10 from vertically disengaging the mounting groove 211. The positioning portion 111 is designed to be approximately the shape of a partial sphere or ellipsoid, with the side facing the busbar 21 being a curved surface, and the curvature of the contact portion between the positioning portion 111 and the busbar 21 is relatively low. Compared to a flat surface, the curved surface reduces the contact area with the busbar 21, which facilitates the disassembly and assembly of the battery cell 10. At the same time, the low curvature of the curved surface also ensures the electrical connection requirements of the pole 11, avoiding abnormal conditions such as poor contact due to a small contact surface.

[0045] In one embodiment, the battery module 100 further includes an integrated board 20, which is connected to the busbar 21. In this embodiment, the integrated board 20 is also provided with a wire harness isolation plate, an FPC assembly 23 (Flexible Printed Circuit, flexible circuit board) and a fireproof and heat-insulating structure on the top of the battery cell 10. Figure 5 In this embodiment, the FPC assembly 23 is arranged in the middle section of the integrated board 20, between the two poles 11 of each battery cell 10, to facilitate the connection of each busbar 21. The integrated board 20 can be made using an integrated molding process, such as injection molding, to improve the strength of the integrated board 20 while simplifying the installation process. Since the battery cells 10 in this embodiment are inverted compared to the prior art, the layout positions of some components change accordingly. Adaptively assembling these components on the integrated board 20 can simplify the structure, optimize the process, and improve safety and installation efficiency.

[0046] In this embodiment, a plurality of busbars 21 are provided in the integrated board 20, each busbar 21 electrically connects the terminals of adjacent battery cells 10, and all battery cells 10 are sequentially connected in series, parallel or mixed to improve the total output voltage and capacity of the battery module.

[0047] In one embodiment, the battery module 100 further includes a liquid cooling plate 40, which is connected to the integrated board 20, and the liquid cooling plate 40 and the manifold 21 are respectively arranged on both sides of the integrated board 20. The liquid cooling plate 40 is connected to the side of the integrated board 20 away from the battery cell 10, and is used to cool the battery cell 10. Please note that, please continue to refer to Figure 1Compared with the prior art, in this technical solution, the battery cell 10 is inverted, and the pole 11 is closer to the liquid cooling plate 40. Since more heat is generated at the pole 11, the structure of the battery module 100 of this embodiment has a better heat dissipation effect, effectively reducing the temperature difference on the battery cell 10.

[0048] The liquid cooling plate 40 can be formed by extrusion of aluminum profiles, a stamped plate with dual parallel water channels, or a double-layer liquid cooling plate. This application does not limit the specific selection of the liquid cooling plate 40.

[0049] In this embodiment, a water channel 41 is provided in the liquid cooling plate 40 . The water channel 41 includes an inlet and an outlet that are oppositely arranged. A flow regulating device (not shown) is provided at the inlet and / or the outlet.

[0050] The water channel 41 is also connected to the electrical device. For example, when this embodiment is applied to a vehicle, the water channel 41 is connected to the vehicle's water cooling circuit to achieve a complete cooling medium circulation. In actual applications, the various parameters of the liquid cooling plate 40 can be set based on the actual usage scenario and combined with the results of heat dissipation simulation. The parameters of the liquid cooling plate 40 include but are not limited to the shape, direction, depth, width, and length of the water channel 41 in the liquid cooling plate 40.

[0051] A water flow control device is located at the inlet and / or outlet of water channel 41 to adjust the opening of the inlet and outlet water channel 41 and thereby regulate the flow rate. In this embodiment, the flow control device can select different thermal management strategies based on the operating conditions of the vehicle being used, thereby controlling the overall battery pack temperature within an appropriate range and ensuring battery safety. The determination of different operating conditions, such as vehicle acceleration and high-power fast charging, can be determined by comprehensively analyzing parameters such as the battery's current temperature, output power, and input commands.

[0052] In this embodiment, the flow control device can switch the liquid cooling plate 40 between at least two thermal management strategies: a normal cooling mode and an enhanced cooling mode, to meet different operating requirements. The difference between the normal cooling mode and the enhanced cooling mode lies in the different flow rates of the cooling medium flowing through the water channel 41. The enhanced cooling mode has a higher flow rate and a stronger cooling effect.

[0053] In one embodiment, the battery module 100 further includes a temperature averaging plate 50 , which is disposed between adjacent battery cells 10 . The temperature averaging plate 50 is provided with supporting legs 51 , which are connected to the liquid cooling plate 40 .

[0054] Furthermore, this embodiment utilizes a flexible VC vapor chamber (vapor chamber). The vacuum chamber within the VC vapor chamber contains liquid. When absorbing heat, the liquid evaporates and diffuses throughout the chamber, transferring the heat to the cold end. The vapor then condenses and flows back, achieving a heat dissipation cycle for the working fluid. This vapor chamber 50 offers higher heat dissipation efficiency.

[0055] In this embodiment, the temperature vapor chamber 50 is bonded to the larger surface of the battery cell 10 (the side surface of the battery cell in this embodiment) using thermally conductive double-sided tape to ensure sufficient contact. This method not only conducts heat but also serves as a fixation. Compared to the existing practice of using thermal paste, which suffers from difficulties in operation and uneven application, the use of thermally conductive double-sided tape is cleaner, faster, and provides shock absorption and cushioning, further improving installation efficiency and safety. The thermal conductivity of the thermally conductive double-sided tape in this embodiment is not less than 3W / (m*K).

[0056] The main contact surface of the heat spreader 50 adheres to the side of the battery cell 10. Support legs 51 are provided at each end. These legs bypass the integrated board 20 and bridge from both sides to the liquid cooling plate 40. These legs not only provide support but also conduct heat, allowing heat to escape from the larger side surfaces of the battery cell 10 through the heat spreader 50. Compared to existing technologies, this embodiment dissipates heat from the battery cell 10's poles 11 and larger surfaces in multiple directions, adding an internal heat dissipation loop and improving the heat dissipation and safety of the battery module. The heat dissipation path from the battery cell 10 through the side is: battery cell 10 - thermal double-sided adhesive tape - heat spreader 50 - liquid cooling plate 40.

[0057] The VC heat spreader 50 simultaneously provides support, heat dissipation, fireproof insulation between adjacent battery cells 10, and buffers against expansion caused by aging. This eliminates the need for existing components such as fireproof insulation and expansion cushions, simplifying components, increasing integration, reducing space requirements, and improving installation efficiency. Furthermore, the VC heat spreader 50 further simplifies the structure, avoiding the complex design of the cooling plate requiring access to a cooling medium, simplifying the structure of the battery module 100 and improving operational safety.

[0058] In one embodiment, a heat conducting portion 213 is provided on the busbar 21, and the heat conducting portion 213 protrudes toward the integrated board 20. The integrated board 20 is provided with a recessed portion 24 corresponding to the shape of the heat conducting portion 213 on the side facing the heat conducting portion 213, and the recessed portion 24 can accommodate the heat conducting portion 213. In this embodiment, the heat conducting portion 213 is a cylinder, and other shapes can also be selected in other embodiments. This application does not impose specific restrictions on this. The protruding heat conducting portion 213 is closer to the liquid cooling plate 40, which can more efficiently conduct heat from the side of the pole 11 of the battery cell 10, thereby improving the heat dissipation effect. At the same time, the protruding heat conducting portion 213 also strengthens the fixed connection between the busbar 21 and the liquid cooling plate 40. In this embodiment, the heat conducting portion 213 can pass through the recessed portion 24 and penetrate the integrated board 20 to directly contact the liquid cooling plate 40, thereby improving the heat dissipation effect.

[0059] In this embodiment, the battery module 100 also includes an insulating thermal pad (not shown), which is provided between the busbar 21 and the liquid cooling plate 40. Furthermore, at the heat conducting portion 213 on the busbar 21, an insulating film is provided on the surface of the heat conducting portion 213 to ensure electrical safety. A knurled edge can also be provided on the insulating film to further strengthen the connection strength between the heat conducting portion 213 and the liquid cooling plate 40. The material of the insulating film in this embodiment can be selected from polyurethane mixture, polyimide film, etc., and its performance parameters are as follows: insulation strength is not less than 5.5Kv / mil, tensile strength is not less than 140MPa, and thermal conductivity is not less than 3W / (m*K). The specific thickness, depth and other parameters of the insulating film can be designed and selected according to the actual assembly effect and simulation results.

[0060] In this embodiment, heat conduction from the battery cell 10 through the terminal 11 proceeds as follows: battery cell 10 - terminal 11 - busbar 21 - (insulating film -) insulating thermal pad - liquid cooling plate 40. This embodiment provides two heat dissipation pathways, effectively improving heat dissipation while reducing temperature differences between different areas of the battery cell 10, thereby significantly increasing the performance and service life of the battery cell 10.

[0061] Furthermore, the flatness of the heat-conducting portion 213 on the busbar 21 and the recessed portion 24 of the liquid cooling plate 40 in contact therewith is controlled within 0.15mm, ensuring a close fit between the two and avoiding gaps between the contact surfaces to ensure effective heat dissipation. Since an insulating thermal pad is also provided between the busbar 21 and the liquid cooling plate 40, a limiter can be provided on the liquid cooling plate 40 to limit and fix the deformation of the insulating thermal pad, ensuring a close fit between the liquid cooling plate 40, the insulating thermal pad, and the busbar 21.

[0062] The parameters of the insulating thermal pad in this embodiment include: a density not exceeding 2.5g / cm², a flame retardancy rating of V0, a ​​thermal conductivity of no less than 3W / (m*K), a compression ratio of 30% ± 5%, and compliance with ASTM D5470. The specific shape, thickness, and area of ​​the insulating thermal pad can be determined based on the actual assembly conditions and the results of heat dissipation simulations.

[0063] The integrated board 20 consists of a heat-conducting portion and a non-heat-conducting portion, divided according to whether they transfer heat. The non-heat-conducting portion, due to its lower temperature, can directly contact the liquid cooling plate 40. An insulating thermal pad is placed between the heat-conducting portion and the liquid cooling plate 40 to improve the safety of the battery module 100.

[0064] An explosion-proof valve is usually provided on the battery cell 10. In this embodiment, an exhaust groove (not shown) is also provided on the integrated board 20 at the position corresponding to the explosion-proof valve in each battery cell 10. The exhaust groove is used to discharge the smoke generated when the corresponding battery cell 10 has thermal runaway, so as to achieve the effect of reducing the pressure and improve the safety performance of the battery module.

[0065] One embodiment of the present application further provides a battery pack, comprising a housing and the battery module 100 described in the aforementioned embodiments. The battery module 100 is disposed within the housing, and the liquid cooling plate 40 in the battery module 100 can be considered as part of the bottom plate of the housing to simplify the housing structure.

[0066] An embodiment of the present application further provides an electric device, including the battery pack described in the above embodiment. In this embodiment, the electric device is used as a carrier for illustration, and does not limit the choice of the electric device.

[0067] The technical solution of the present application replaces the existing welding connection method with a sliding connection by slidingly connecting the pole 11 and the busbar 21, thereby avoiding the risk of high-voltage breakdown caused by welding slag falling into the battery module and improving the safety of the battery module 100.

[0068] At the same time, the battery module 100 also dissipates heat comprehensively and efficiently for the battery cells 10 through two heat dissipation paths, effectively reducing the temperature and temperature difference of the battery cells 10. In this embodiment, the temperature difference of the battery pack is reduced from 15°C to 5°C and the accuracy of temperature control is improved, and the service life of the battery is correspondingly extended by 10%. At the same time, the two heat dissipation paths can more easily implement different thermal management control strategies by adjusting the liquid cooling plate 40 to ensure the safe use of the battery cells 10. On the other hand, the structure of the present application, such as the integrated board 20, enables the battery module 100 to have a higher degree of integration, effectively simplifies the installation process, and improves assembly efficiency.

[0069] In several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may also be implemented in other ways. The apparatus embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions, and operations of the apparatus, methods, and computer program products according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram may represent a module, a program segment, or a portion of a code, and the module, program segment, or a portion of the code includes one or more executable instructions for implementing a specified logical function.

[0070] In addition, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0071] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

[0072] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

Claims

1. A battery module, characterized in that: include: A plurality of battery cells are stacked, each of the battery cells comprising a first surface, a pole is provided on the first surface, and a positioning portion is provided at one end of the pole facing away from the first surface; A busbar is provided with a mounting groove, wherein the busbar is electrically connected to the adjacent battery cells by slidingly connecting the poles through the mounting groove, and the side of the positioning portion facing the busbar is a partial ellipsoid; an integrated board connected to the busbar; a liquid cooling plate connected to the integrated plate, wherein the liquid cooling plate and the manifold are respectively arranged on both sides of the integrated plate; The current collector is provided with a heat conducting portion, which protrudes toward the integrated board. The integrated board is provided with a recessed portion, which accommodates the heat conducting portion. The heat conducting portion passes through the recessed portion and penetrates the integrated board to directly contact the liquid cooling plate.

2. The battery module according to claim 1, wherein: A positioning groove is provided on the pole, a positioning protrusion is provided in the mounting groove, and the positioning protrusion is accommodated in the positioning groove.

3. The battery module according to claim 2, characterized in that: An inclined transition surface is provided on the pole, and the transition surface connects the positioning groove and the first surface.

4. The battery module according to claim 1, wherein: It also includes a temperature averaging plate, which is arranged between adjacent battery cells. The temperature averaging plate is provided with supporting feet, and the supporting feet are connected to the liquid cooling plate.

5. A battery pack, comprising a box, characterized in that: Also included is the battery module according to any one of claims 1 to 4.

6. An electrical device, characterized in that: Comprising the battery pack as claimed in claim 5.

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