Battery module and battery pack

Abstract

The utility model relates to a battery module and a battery pack, and relates to the technical field of batteries, and the battery module comprises a plurality of battery cells which are electrically connected with one another; the fixing brackets are arranged at two ends of the plurality of battery cells and are used for fixing the plurality of battery cells, and the fixing brackets are provided with limiting holes exposed out of the end surfaces of the battery cells; the heating film is arranged at one end or two ends of the battery cells, the heating film is located on one side, far away from the battery cells, of the fixing support, and the heating film is fixedly connected and attached to the end faces of the multiple battery cells through the limiting holes. Through stable battery cell fixation and effective heat management, the overall performance of the module is improved, and the service life of the module is prolonged; the end faces of the battery cells are fixed by the fixing brackets through the limiting holes, so that the stable positions of the battery cells in the module are ensured; the heating film is tightly attached to the end face of the battery cell, and the thermodynamic characteristic that the axial heat conductivity coefficient of the cylindrical battery cell is multiple times of the radial heat conductivity coefficient is utilized, so that the effect of increasing the heating rate is achieved, and the reliability under the low-temperature working condition is ensured.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery module and a battery pack. Background Art

[0002] Cylindrical cells are widely used in power batteries and energy storage batteries, especially in mobile energy storage and small household energy storage products. Cells must operate within an appropriate temperature range to ensure effective performance and lifecycle safety. However, lithium iron phosphate cells cannot be charged at low temperatures (below 0°C). This results in product failure in low-temperature environments, significantly impacting the user experience.

[0003] Currently, to effectively manage battery temperature, particularly in power battery packs, a complex thermal management solution is employed: adding a serpentine liquid cooling plate to the cylindrical surface of the battery cell for water cooling and water heat control. However, this solution requires additional components such as a water pump and PTC, which is not only costly but also takes up a lot of space. For small energy storage packs, heating solutions that use serpentine heating plates, heating films, or heating wire wrapped around the cylindrical surface of the battery cell are often considered to cope with low-temperature environments. However, these solutions face complex process challenges during assembly and cannot guarantee a perfect fit with the cylindrical surface of the battery cell. This can lead to uneven heating or safety issues, compromising heating effectiveness and product reliability.

[0004] Despite attempts at various thermal management technologies, most energy storage products using cylindrical cells currently do not take any heating measures. This makes it impossible for the products to charge normally in low-temperature environments, severely limiting their usage scenarios and user experience.

[0005] Therefore, it is urgent to develop a battery heating solution with simple assembly process, low cost and high heating efficiency. Utility Model Content

[0006] In order to develop a battery heating solution with simple assembly process, low cost and high heating efficiency, the present application provides a battery module and a battery pack.

[0007] The battery module and battery pack provided in this application adopt the following technical solutions:

[0008] A battery module, comprising:

[0009] a plurality of battery cells electrically connected to each other;

[0010] A fixing bracket is provided at both ends of the plurality of battery cells and fixes the plurality of battery cells, wherein the fixing bracket is provided with a limiting hole that leaks out of the end surface of the battery cell;

[0011] A heating film is provided at one end or both ends of the battery core. The heating film is located on a side of the fixing bracket away from the battery core. The heating film is fixedly bonded to the end faces of the plurality of battery cores through the limiting holes.

[0012] By adopting the above-mentioned technical solution, during assembly, multiple battery cells are electrically connected to each other to form a whole, and fixed brackets are installed at both ends of the battery cell. Multiple battery cells are fixed by the fixed brackets. The fixed brackets ensure the stable position and safe connection of the battery cells through the design of limiting holes. Then the heating film is designed at one end or both ends of the battery cell, and the heating film is fixedly bonded to the end face of the battery cell through the limiting holes to ensure the stable installation of the heating film and effective heat conduction effect. The battery module of the present application improves the overall performance and service life of the module through stable battery cell fixation and effective thermal management: the fixed bracket fixes the end face of the battery cell through the limiting holes to ensure the stable position of the battery cell in the module, prevent movement or damage, and enhance the structural stability of the module. The heating film is designed to fit tightly with the end face of the battery cell, and it utilizes the thermodynamic characteristics of the cylindrical battery cell that the axial thermal conductivity is several times the radial thermal conductivity, thereby achieving the effect of increasing the heating rate, effectively conducting and distributing heat, improving the performance and life of the battery module, and ensuring reliability under low temperature working conditions.

[0013] In a specific possible implementation manner, the fixing bracket is provided with a fixing leg, and the fixing leg is arranged along the circumference of the limiting hole and partially contacts the end face of the battery cell.

[0014] By adopting the above technical solution, the fixing legs are protruding parts on the fixing bracket and are arranged around the limiting holes. The fixing legs provide additional support and stability when in contact with the battery cells, helping to ensure a safe connection between the fixing bracket and the battery cells. The fixing legs can effectively support the battery cells and maintain their fixed position in the module, thereby preventing movement or vibration during use, while reducing possible damage to the battery cells or unnecessary pressure.

[0015] In a specific possible implementation scheme, the heating film is provided with an avoidance hole, the avoidance hole is arranged corresponding to the fixed support leg, and the fixed support leg passes through the avoidance hole.

[0016] By adopting the above technical solution and utilizing the avoidance hole design, the fixed legs can pass through the heating film without damaging or interfering with its covering effect on the surface of the battery cell, ensuring that the heating film can effectively distribute heat throughout the battery module. The avoidance hole design simplifies the assembly process and reduces assembly problems that may be caused by conflicts between the fixed bracket and the heating film, thereby improving assembly convenience and efficiency.

[0017] In a specific possible implementation manner, an assembly gap is left between the fixed support leg and the heating film.

[0018] By adopting the above technical solution and using a design with a gap, the fixing bracket and the heating film can be prevented from direct contact or excessive proximity during assembly, thereby avoiding damage or adverse effects that may be caused by physical interference; and leaving an appropriate assembly gap can improve the assembly accuracy and fault tolerance, ensuring the smooth progress of the assembly process.

[0019] In a specific embodiment, an electrical connection assembly is further included, and poles are provided at one or both ends of the battery cell, and the poles of adjacent battery cells are electrically connected via the electrical connection assembly.

[0020] By adopting the above technical solution and utilizing the design of the poles and electrical connection components, the reliability of the internal circuit connection of the battery module can be ensured. The poles are electrically connected through the electrical connection components, ensuring that the current can be effectively transmitted from one battery cell to the adjacent battery cell, thereby forming a complete circuit path.

[0021] In a specific possible implementation scheme, the electrical connection component includes a connecting aluminum bar, and adjacent poles are electrically connected through the connecting aluminum bar. The connecting aluminum bar is located between the heating film and the battery core, and the heating film is fixedly bonded to the connecting aluminum bar.

[0022] By adopting the above technical solution and using the connecting aluminum bar as the electrical connection component, good electrical conductivity can be provided. The aluminum material has a high electrical conductivity, which helps to reduce the resistance in the circuit, thereby reducing energy loss and heat generation; and the connecting aluminum bar is located between the heating film and the battery cell and is fixedly bonded. This design not only ensures the stability of the electrical connection, but also helps to optimize the thermal management of the module. A good heat transfer path can effectively heat the battery cell and improve the overall heat transfer efficiency and stability.

[0023] In a specific possible implementation scheme, the connecting aluminum bar extends radially along the end face of the battery cell and is arranged in contact with the end face of the battery cell.

[0024] By adopting the above technical solution, the extended design of the connecting aluminum bar along the end face of the battery cell is used to ensure a wider contact surface. By expanding the planar area of the connecting aluminum bar, heat can be effectively conducted and distributed to achieve heating of the battery cell, thereby improving the performance and life of the battery module and ensuring reliability under low-temperature working conditions. In addition, the large area of the connecting aluminum bar provides sufficient adhesion area, which is conducive to the firm fixation of the heating film, simplifies the assembly process, reduces the risk of possible loosening or failure, and improves the overall product quality.

[0025] In a specific possible implementation manner, the heating film is provided with connecting lines.

[0026] By adopting the above technical solution, the heating film can be conveniently connected to the control board using the reserved connection line, which allows the heating process to be precisely controlled as needed, such as adjusting the temperature or heating time to meet different application requirements.

[0027] A battery pack includes the battery module as described above, wherein the battery modules are provided in plurality and adjacent battery modules are fixed by connecting bolts.

[0028] By adopting the above technical solution, the present application fixes adjacent battery modules together through connecting bolts, thereby ensuring a firm connection between the battery modules, as well as the structural strength and stability of the entire battery pack; the design of fixing with connecting bolts makes it more convenient when the battery module needs to be maintained or replaced. By loosening the bolts, a single module can be easily removed or replaced without affecting other modules or the structure of the entire battery pack; the battery pack of the present application can not only provide good mechanical support and structural stability, but also facilitate maintenance and management, while ensuring the safety and performance stability of the battery pack under various environmental conditions.

[0029] In a specific embodiment, the heating film is located between two adjacent battery modules to heat the battery cells of the two adjacent battery modules.

[0030] By adopting the above technical solution and utilizing the heating film designed between the battery modules, the heating system of the entire battery pack has been optimized and integrated. This design helps to reduce energy waste and improve energy efficiency, providing better temperature management and control for the battery pack, thereby improving the overall efficiency and reliability of the battery pack.

[0031] In summary, the beneficial technical effects of this application are:

[0032] The battery module of the present application improves the overall performance and service life of the module through stable cell fixation and effective thermal management: the fixed bracket fixes the end face of the cell through the limiting hole, ensures the stable position of the cell in the module, prevents movement or damage, and enhances the structural stability of the module; and, the present application ensures reliable fitting of the heating film through the heating interface between the heating film and the cell or the planar coordination of the heating interface connected to the aluminum bar, which is conducive to heat conduction, avoids the occurrence of high-temperature local hot spots during the heating process, and improves heating safety; at the same time, utilizing the thermodynamic characteristics of the cylindrical cell that the axial thermal conductivity is several times higher than the radial thermal conductivity, heat is conducted along the axial direction of the cell to achieve heating of the entire cell, thereby achieving the effect of increasing the heating rate, effectively conducting and distributing heat, improving the performance and life of the battery module, and ensuring reliability under low-temperature working conditions, and the heating film assembly process of this design is simple and reliable, with low overall cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural diagram of the battery module of an embodiment of the present application.

[0034] Figure 2 It is a top view of the battery module of an embodiment of the present application.

[0035] Figure 3 It is a schematic diagram used to display the structure of battery cells, electrical connection components, and heating films.

[0036] Figure 4 It is used to show the assembly structure diagram between battery modules.

[0037] Explanation of the accompanying drawings: 1. Battery module; 2. Battery cell; 21. Pole; 3. Fixed bracket; 31. Limiting hole; 32. Fixed support foot; 4. Heating film; 41. Avoidance hole; 42. Connecting wire; 5. Electrical connection assembly; 51. Connecting aluminum bar; 6. Connecting bolt. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-4 This application is described in further detail.

[0039] Reference Figure 1 and Figure 2 , the embodiment of the present application discloses a battery module, comprising:

[0040] A plurality of battery cells 2 electrically connected to each other. In this embodiment, the battery cells 2 are cylindrical battery cells 2 , and the plurality of battery cells 2 are arranged in an array;

[0041] The fixing brackets 3 are respectively provided at both ends of the plurality of battery cells 2. In this embodiment, the fixing brackets 3 are respectively pressed on both ends of the battery cells 2. The two fixing brackets 3 jointly fix the plurality of battery cells 2. The fixing brackets 3 are provided with limiting holes 31 that leak out of the end faces of the battery cells 2. The limiting holes 31 correspond one-to-one to the battery cells 2. The limiting holes 31 are used to limit the height direction of the battery cells 2.

[0042] The heating film 4 includes, but is not limited to, a silicone heating film or a PI heating film in this embodiment. The heating film 4 is provided at one or both ends of the battery cell 2. The heating film 4 is located on the side of the fixing bracket 3 away from the battery cell 2. In this embodiment, according to the heating rate requirements of different battery modules 1, the heating film 4 is selected to be arranged at one or both ends of the battery cell 2 to provide different heating powers. The heating film 4 can be arranged between two groups of battery modules 1 to heat the battery cells 2 on both sides, or can be arranged on both sides of a single group of battery modules 1 to improve the heating rate of the battery cell 2.

[0043] The heating film 4 is fixedly attached to the end faces of the multiple battery cells 2 through the limiting holes 31. In this embodiment, the heating film 4 is configured as a single-sided double-sided adhesive structure, and the heating film 4 and the multiple battery cells 2 are adhesively connected. In this embodiment, the limiting holes 31 are designed to reveal most of the structure of the end faces of the battery cells 2. The exposed surfaces of the ends of the multiple battery cells 2 form a large plane. The heating interface between the heating film 4 and the battery cells 2 has no round surface, but a large plane. This can ensure that the heating film 4 is reliably attached, facilitate heat conduction, avoid high-temperature local hot spots during the heating process, and improve heating safety.

[0044] In this embodiment, the present application designs the heating film 4 to fit the end surface of the cylindrical battery core 2 in accordance with the thermodynamic characteristics that the axial thermal conductivity is several times greater than the radial thermal conductivity, so as to increase the heating rate.

[0045] The heating film 4 is provided with a connecting line 42. In this embodiment, the connecting line 42 is used to connect to the control panel system. By reserving the connecting line 42, the heating film 4 can be conveniently connected to the control panel system, which allows the heating process to be precisely controlled as needed, such as adjusting the temperature or heating time, to meet different application requirements.

[0046] During the actual assembly process, multiple battery cells 2 are electrically connected to each other to form a whole. Fixed brackets 3 are installed at both ends of the battery cells 2. The multiple battery cells 2 are fixed by the fixed brackets 3. The fixed brackets 3 ensure the stable position and safe connection of the battery cells 2 through the design of the limiting holes 31. Then, the heating film 4 is designed at one end or both ends of the battery cell 2. The heating film 4 is fixedly bonded to the end surface of the battery cell 2 through the limiting holes 31 to ensure the stable installation of the heating film 4 and the effective heat conduction effect.

[0047] During this process, the overall performance and service life of the module are improved through stable fixation of the battery cell 2 and effective thermal management. The fixing bracket 3 fixes the end face of the battery cell 2 through the limiting hole 31, ensuring the stable position of the battery cell 2 in the module, preventing movement or damage, and enhancing the structural stability of the module.

[0048] During the actual working process, the heating film 4 is controlled by the control panel system. At this time, due to the close fitting design between the heating film 4 and the end face of the battery cell 2, it utilizes the thermodynamic characteristics of the cylindrical battery cell 2 that the axial thermal conductivity is several times the radial thermal conductivity. The heating film 4 directly heats the end of the battery cell 2 and conducts the heat along the axial direction of the battery cell 2 to achieve heating of the entire battery cell 2, thereby achieving the effect of increasing the heating rate, effectively conducting and distributing heat, improving the performance and life of the battery module 1, and ensuring reliability under low-temperature working conditions.

[0049] The fixing bracket 3 is provided with a plurality of fixing legs 32, which are arranged along the circumference of the limiting hole 31. In this embodiment, four fixing legs 32 are designed on each limiting hole 31, and the four fixing legs 32 are arranged along the circumference of the limiting hole 31. Part of the fixing legs 32 contacts the end face of the battery cell 2; the fixing legs 32 are protruding parts on the fixing bracket 3, which are arranged around the limiting hole 31. When the fixing legs 32 contact the battery cell 2, they provide additional support and stability, which helps to ensure a safe connection between the fixing bracket 3 and the battery cell 2. The fixing legs 32 can effectively support the battery cell 2 and maintain its fixed position in the module, thereby preventing movement or vibration during use, while reducing possible damage to the battery cell 2 or unnecessary pressure.

[0050] The heating film 4 is provided with an avoidance hole 41, which is arranged corresponding to the fixed support leg 32, and the fixed support leg 32 passes through the avoidance hole 41;

[0051] An assembly gap is left between the fixed support leg 32 and the heating film 4. In this embodiment, an assembly gap of, but not limited to, ±2 mm is left between the fixed support 3 and the heating film 4 to ensure that there is no interference during the assembly process. This prevents the fixed support 3 and the heating film 4 from direct contact or excessive proximity during assembly, thereby avoiding damage or adverse effects that may be caused by physical interference. In addition, leaving an appropriate assembly gap can improve assembly accuracy and fault tolerance, ensuring a smooth assembly process.

[0052] By designing the avoidance hole 41, the fixing leg 32 can pass through the heating film 4 without damaging or interfering with its covering effect on the surface of the battery cell 2, ensuring that the heating film 4 can effectively distribute heat in the entire battery module 1. The design of the avoidance hole 41 simplifies the assembly process and reduces assembly problems that may be caused by conflicts between the fixing bracket 3 and the heating film 4, thereby improving assembly convenience and efficiency.

[0053] Reference Figure 3 The battery module 1 further includes an electrical connection component 5. In this embodiment, the electrical connection component 5 includes but is not limited to a CCS component. A pole 21 is provided at one or both ends of the battery cell 2. In this embodiment, for the battery cell 2 with the positive and negative poles 21 provided at one end, the electrical connection component 5 is designed only at one end of the battery cell 2. For the battery cell 2 with the positive and negative poles 21 provided at both ends, electrical connection components 5 are designed at both ends of the battery cell 2. The poles 21 of adjacent battery cells 2 are electrically connected through the electrical connection component 5. The design of the poles 21 and the electrical connection component 5 can ensure the reliability of the internal circuit connection of the battery module 1. The poles 21 are electrically connected through the electrical connection component 5, which ensures that the current can be effectively transmitted from one battery cell 2 to the adjacent battery cell 2, thereby forming a complete circuit path.

[0054] The electrical connection component 5 includes a connecting aluminum bar 51, and the poles 21 of adjacent battery cells 2 are electrically connected through the connecting aluminum bar 51. The connecting aluminum bar 51 is located between the heating film 4 and the battery cell 2, and the heating film 4 and the connecting aluminum bar 51 are fixedly bonded. In this embodiment, the connecting aluminum bar 51 is a planar structure, and the heating film 4 and the connecting aluminum bar 51 are adhesively connected; by using the connecting aluminum bar 51 as the electrical connection component 5, good electrical conductivity can be provided. Aluminum material has high electrical conductivity, which helps to reduce the resistance in the circuit, thereby reducing energy loss and heat generation; and the connecting aluminum bar 51 is located between the heating film 4 and the battery cell 2, and is fixedly bonded. This design not only ensures the stability of the electrical connection, but also helps to optimize the thermal management of the module. A good heat transfer path can effectively heat the battery cell 2 and improve the overall heat transfer efficiency and stability.

[0055] The connecting aluminum bar 51 extends radially along the end face of the battery cell 2 and is arranged in contact with the end face of the battery cell 2. In this embodiment, the connecting aluminum bar 51 is a circular structure. The connecting aluminum bar 51 can be in contact with the portion of the end of the battery cell 2 that leaks out of the limiting hole 31 over a large area, providing the largest connection plane, ensuring that the heating film 4 has sufficient bonding area, so that the heating film 4 can effectively heat the connecting aluminum bar 51, and then heat the battery cell 2 pole 21 and the end face of the battery cell 2 through the connecting aluminum bar 51. The heat is conducted along the axial direction of the battery cell 2 to heat the entire battery cell 2.

[0056] By extending the design of the connecting aluminum bar 51 along the end face of the battery cell 2, a wider contact surface is ensured. By expanding the planar area of the connecting aluminum bar 51, heat can be effectively conducted and distributed to heat the battery cell 2, thereby improving the performance and life of the battery module 1 and ensuring reliability under low-temperature working conditions. In addition, the large area of the connecting aluminum bar 51 provides sufficient adhesion area, which is conducive to the firm fixation of the heating film 4, simplifies the assembly process, reduces the risk of possible loosening or failure, and improves the overall product quality.

[0057] Reference Figure 4 The present application also provides a battery pack, including the battery module 1 as described above, wherein the battery modules 1 are provided in plurality, and the plurality of battery modules 1 are stacked and arranged, and adjacent battery modules 1 are fixed by connecting bolts 6; the adjacent battery modules 1 are fixed together by connecting bolts 6, thereby ensuring a firm connection between the battery modules 1, as well as the structural strength and stability of the entire battery pack; the design of fixing with connecting bolts 6 makes it more convenient when the battery module 1 needs to be maintained or replaced, and by loosening the bolts, a single module can be easily disassembled or replaced without affecting other modules or the structure of the entire battery pack; the battery pack of the present application can not only provide good mechanical support and structural stability, but also facilitate maintenance and management, while ensuring the safety and performance stability of the battery pack under various environmental conditions.

[0058] In this embodiment, the heating film 4 can be designed to be located between two adjacent battery modules 1 to heat the battery cells 2 of the two adjacent battery modules 1; by designing the heating film 4 between the battery modules 1, the battery modules 1 on both sides can be heated, thereby optimizing and integrating the heating system of the entire battery pack. This design helps to reduce energy waste and improve energy efficiency, provide better temperature management and control for the battery pack, and thus improve the overall efficiency and reliability of the battery pack.

[0059] The implementation principle of the embodiment of the present application is as follows: the present application mainly adopts the non-circular surface of the heating interface between the heating film 4 and the battery cell 2 or the heating interface connected to the aluminum bar 51, which is designed to be flat, thereby ensuring that the heating film 4 is reliably attached, facilitating heat conduction, avoiding the occurrence of high-temperature local hot spots during the heating process, and improving heating safety. At the same time, the thermodynamic characteristic that the axial thermal conductivity of the cylindrical battery cell 2 is several times that of the radial thermal conductivity is utilized to increase the heating rate. In addition, the assembly process of the heating film 4 of this design is simple and reliable, and the overall cost is low.

[0060] During the actual assembly process, multiple battery cells 2 are electrically connected to each other to form a whole. Fixed brackets 3 are installed at both ends of the battery cells 2. The multiple battery cells 2 are fixed by the fixed brackets 3. The fixed brackets 3 ensure that the end portions of the battery cells 2 are partially exposed through the design of the limiting holes 31. Then, according to the design of the actual poles 21 of the battery cells 2, they are connected through the electrical connection components 5. The poles 21 of adjacent battery cells 2 are connected into a whole through the connecting aluminum bars 51.

[0061] Then, according to the actual demand for heating rate, the heating film 4 is designed to be installed at one or both ends of the battery cell 2. The heating film 4 is directly bonded to the end face of the battery cell 2 through the limiting hole 31, or bonded to the connecting aluminum bar 51. The heat is transferred to the battery cell 2 and the terminal 21 through the connecting aluminum bar 51, ensuring the stable installation of the heating film 4 and the effective heat conduction effect, thus completing the assembly of the battery module 1. Then, multiple battery modules 1 are fixed together by connecting bolts 6 to form a battery pack.

[0062] During actual operation, the heating film 4 is controlled by the control panel system. At this time, due to the close fitting design between the heating film 4 and the end face of the battery cell 2, it utilizes the thermodynamic characteristics of the cylindrical battery cell 2 that the axial thermal conductivity is several times the radial thermal conductivity. The heating film 4 directly heats the end of the battery cell 2, or heats the connecting aluminum bar 51 and the end of the battery cell 2 and the pole 21 by heating the connecting aluminum bar 51. The heat is conducted along the axial direction of the battery cell 2 to achieve heating of the entire battery cell 2, thereby achieving the effect of increasing the heating rate, effectively conducting and distributing heat, improving the performance and life of the battery module 1, and ensuring reliability under low-temperature working conditions.

[0063] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A battery module, characterized in that: include: a plurality of battery cells electrically connected to each other; A fixing bracket is provided at both ends of the plurality of battery cells and fixes the plurality of battery cells, wherein the fixing bracket is provided with a limiting hole that leaks out of the end surface of the battery cell; A heating film is provided at one end or both ends of the battery core. The heating film is located on a side of the fixing bracket away from the battery core. The heating film is fixedly bonded to the end faces of the plurality of battery cores through the limiting holes.

2. The battery module according to claim 1, wherein: The fixing bracket is provided with a fixing leg, and the fixing leg is arranged along the circumference of the limiting hole and partially contacts the end surface of the battery core.

3. The battery module according to claim 2, wherein: The heating film is provided with an avoidance hole, the avoidance hole is arranged corresponding to the fixed support leg, and the fixed support leg passes through the avoidance hole.

4. The battery module according to claim 3, wherein: An assembly gap is left between the fixed support leg and the heating film.

5. The battery module according to claim 1, wherein: It also includes an electrical connection component, one end or both ends of the battery cell are provided with a pole, and the poles of adjacent battery cells are electrically connected through the electrical connection component.

6. The battery module according to claim 5, characterized in that: The electrical connection assembly includes a connecting aluminum bar, and adjacent poles are electrically connected through the connecting aluminum bar. The connecting aluminum bar is located between the heating film and the battery core, and the heating film is fixedly bonded to the connecting aluminum bar.

7. The battery module according to claim 6, wherein: The connecting aluminum bar extends radially along the end face of the battery core and is arranged in contact with the end face of the battery core.

8. The battery module according to claim 1, wherein: The heating film is provided with connecting lines.

9. A battery pack comprising the battery module according to any one of claims 1 to 8, characterized in that: The battery modules are provided in plurality, and adjacent battery modules are fixed by connecting bolts.

10. The battery pack according to claim 9, wherein: The heating film is located between two adjacent battery modules to heat the battery cells of the two adjacent battery modules.

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