Cylindrical battery cell module and battery pack

Abstract

The utility model relates to battery technology field, specifically disclose a cylindrical electric core module and battery package, including electric core body, connecting aluminium row, heating structure and fastener, electric core body is arrayed and realizes electricity connection through connecting aluminium row, heating structure includes top heating plate, middle heating plate and bottom heating plate, top heating plate is located between connecting aluminium row and electric core body, middle heating plate is longitudinally arranged between electric core array and is contacted with electric core side, bottom heating plate is located at the bottom of electric core, and with middle heating plate is inserted and constitutes self -supporting three -dimensional heating frame, fastener is pressed into a whole with heating structure and electric core, the utility model discloses through three -dimensional heating frame and realizes all -round even heating, and the heating area is significantly increased, and the high rigidity frame is formed by the insertion type frame and fastener compression, and each heating plate realizes reliable connection through the output pole piece, and the close contact is ensured with the cooperation positioning structure, and the heating efficiency and structural reliability are improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cylindrical cell module and battery pack. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the performance and reliability of power batteries, as core components, have attracted much attention. In low-temperature environments, battery activity decreases significantly, leading to reduced charging efficiency and shorter driving range. Therefore, battery thermal management technology has become a key focus of industry research. Cylindrical lithium-ion batteries, due to their advantages such as high energy density, good consistency, and relatively low cost, have been widely used in the electric vehicle field. To ensure that the battery operates within a suitable temperature range and improve the environmental adaptability and efficiency of the entire vehicle, effective heating solutions and structural designs are crucial.

[0003] In the prior art, various heating solutions for battery modules have emerged. For example, utility model patent CN222813911U discloses a battery module and battery pack, which includes a heating assembly and multiple battery cells. The heating assembly includes a first epoxy plate, a heating unit, and a second epoxy plate connected in sequence, with the first epoxy plate bonded to the battery cells. The thickness of the first epoxy plate is greater than that of the second epoxy plate. This solution, by using epoxy plates of different thicknesses, aims to improve the protection of the battery cells and the heating unit, preventing short circuits caused by wear. Furthermore, this prior art also describes the heating unit as including multiple first heating wires and two second heating wires, and attempts to improve temperature uniformity among the battery cells by designing the resistivity of the heating wires.

[0004] However, the aforementioned existing technical solutions have limitations in improving heating efficiency. The heating components in these solutions are mainly concentrated on a single surface of the battery cell, resulting in a limited contact area and a relatively simple heat transfer path. For applications requiring rapid improvement of battery cell activity at low temperatures, this structure makes it difficult to achieve a uniform and rapid overall temperature for the battery cell within a short time, thus requiring further improvement in heating efficiency. Utility Model Content

[0005] To address the technical problems in the prior art, this utility model provides a cylindrical cell module and battery pack, aiming to solve the problem of low heating efficiency caused by the limited contact area between the heating components and the cell and the single heating path in the prior art.

[0006] A cylindrical battery cell module includes a battery cell body, connecting aluminum busbars, a heating structure, and fasteners, wherein... The battery cell body includes multiple cells arranged in an array, and the tops of the multiple battery cell bodies are electrically connected by connecting aluminum busbars; The heating structure includes a top heating plate, a middle heating plate, and a bottom heating plate; The top heating plate is located between the aluminum busbar and the battery cell body; The central heating plate is longitudinally arranged between the arrayed battery cell bodies and contacts the side of the battery cell body. Its top abuts against the top heating plate and is fixed by locking members that pass through the connecting aluminum busbar, the top heating plate and the central heating plate in sequence. The bottom heating plate is located at the bottom of the battery cell body and is used to support the bottom of the battery cell body. The middle heating plate can be plugged into and connected to the bottom heating plate to form a self-supporting three-dimensional heating frame. The fastener is located between the top heating plate and the bottom heating plate to connect and fix the relative positions of the top heating plate and the bottom heating plate, thereby pressing and fixing the heating structure and the battery cell body sandwiched therebetween into a whole.

[0007] Optionally, the top heating plate includes a first epoxy board heating film and a data acquisition circuit board, wherein, The first epoxy plate heating film is disposed on the top of the battery cell body; The acquisition circuit board is located on top of the first epoxy board heating film, and its top is provided with a communication interface for communicating with an external battery management system. The acquisition circuit board is electrically connected to the first epoxy board heating film, the middle heating plate, and the bottom heating plate.

[0008] Optionally, the top heating plate further includes an insulating heat insulation layer, which is disposed between the acquisition circuit board and the first epoxy board heating film to prevent the heat generated by the first epoxy board heating film from being transferred to the acquisition circuit board.

[0009] Optionally, the central heating plate includes a second epoxy heating film and a positioning insert shaft, wherein, The second epoxy board heating film is disposed between the arrayed battery cell bodies, and its top has multiple connection holes for connecting to the locking components; The positioning insert shafts include multiple shafts, which are evenly arranged at the bottom of the second epoxy board heating film. The bottom heating plate is provided with multiple insertion holes that are adapted to the shape and position of the positioning insert shafts, for positioning and inserting the second epoxy board heating film, thus forming the main support of the self-supporting three-dimensional heating frame in the plane perpendicular to the axial direction.

[0010] Optionally, the central heating plate further includes a contoured groove, which includes multiple contoured grooves distributed on both sides of the corresponding battery cell of the second epoxy plate heating film, and the multiple contoured grooves are adapted to the side wall of the corresponding battery cell module. When the central heating plate is positioned between the battery cell bodies, the sidewall of the battery cell body can be embedded in the corresponding contoured groove to increase the contact area between the central heating plate and the sidewall of the battery cell body.

[0011] Optionally, the central heating plate also includes an elastic thermal conductive pad, which is disposed on the inner wall of the contoured groove to compensate for the assembly tolerance between the battery cell body and the heating plate and to increase the thermal contact area.

[0012] Optionally, the bottom heating plate includes a third epoxy heating film and a reinforcing mesh, wherein, The third epoxy heating film is located at the bottom of the battery cell body; The reinforcing ribs are distributed on the top surface of the heating film of the third epoxy board.

[0013] Optionally, a support groove adapted to the bottom heating plate is provided at the top of the battery cell body.

[0014] Optionally, the fastener includes a locking screw and a threaded insert, wherein, The locking screws include four screws, which are respectively located at the four corners of the top heating plate; The threaded inserts include four, which are pre-embedded in the corresponding locking screws of the bottom heating plate; By tightening the four locking screws, the top heating plate and the bottom heating plate move towards each other, thereby axially pressing and fixing the middle heating plate and the battery cell body.

[0015] This utility model also provides a battery pack, including the cylindrical cell module described above.

[0016] Compared with the prior art, the cylindrical cell module and battery pack provided by this utility model have the following advantages: By setting up a top heating plate, a middle heating plate, and a bottom heating plate, a three-dimensional heating structure covering the top, sides, and bottom of the battery cell is constructed, which significantly increases the heating contact area and overcomes the problems of limited contact area and single heat transfer path caused by single-sided heating in the existing technology. This enables the battery cell to heat up quickly and evenly in low-temperature environments, effectively improving heating efficiency.

[0017] The top heating plate adopts a laminated composite structure, integrating the acquisition circuit board, the insulation and heat insulation layer and the first epoxy board heating film into one unit. This not only realizes the integration of heating and signal acquisition functions, but also eliminates external messy wiring harnesses through embedded circuitry, reducing the risk of short circuits. At the same time, the heat insulation layer effectively prevents the heating heat from affecting the reliability of the acquisition circuit, realizing a multi-functional and highly reliable integrated design in a limited space.

[0018] (3) By connecting the middle heating plate and the bottom heating plate to form a self-supporting three-dimensional heating frame, and combining the fasteners that run through the top and bottom to press the entire structure and the battery cell into a whole, a stable architecture with high rigidity and easy assembly is formed. On this basis, the contoured groove, positioning insertion shaft and elastic heat-conducting pad set in the middle heating plate, together with the insertion hole and bearing groove of the bottom heating plate, work together to achieve precise positioning and tolerance compensation between the heating plate and the battery cell. This integrated mechanical design not only ensures close contact and efficient heat conduction between the heating plate and the surface of the battery cell, but also significantly improves the structural integrity and assembly reliability of the module, fundamentally guaranteeing heating efficiency and temperature uniformity.

[0019] (4) The reinforcing rib grid on the surface of the bottom heating plate and the mounting flange on its edge not only enhance its own rigidity and impact resistance, but also provide a reliable mounting interface with the battery pack housing, which significantly improves the overall mechanical performance of the module and can better adapt to the complex working conditions of the vehicle. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a cylindrical battery cell module according to the present invention; Figure 2 This is a schematic diagram showing the disassembled cylindrical battery cell module according to the present invention; Figure 3 This is a schematic diagram of the disassembled structure of the top heating plate of a cylindrical battery cell module according to the present invention; Figure 4 This is a schematic diagram of the central heating plate structure of a cylindrical battery cell module according to the present invention; Figure 5 This is a schematic diagram of the bottom heating plate structure of a cylindrical battery cell module according to the present invention.

[0021] In the diagram: 1. Battery cell body; 2. Connecting aluminum busbar; 3. Heating structure; 31. Top heating plate; 311. First epoxy board heating film; 312. Acquisition circuit board; 313. Insulating and heat-insulating layer; 32. Middle heating plate; 321. Second epoxy board heating film; 322. Positioning insert shaft; 323. Contouring groove; 324. Elastic thermal conductive pad; 33. Bottom heating plate; 301. Insertion hole; 302. Bearing groove; 331. Third epoxy board heating film; 332. Reinforcing rib mesh; 4. Fastener; 41. Locking screw; 42. Threaded insert. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0024] In the description of the embodiments of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0027] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0028] Please see Figure 1-5 This application proposes a cylindrical battery cell module, which includes a battery cell body 1, a connecting aluminum busbar 2, a heating structure 3, and fasteners 4.

[0029] like Figure 1-2 As shown, the battery cell body 1 includes multiple cells arranged in an array, and the tops of the multiple battery cell bodies 1 are electrically connected by connecting aluminum busbars 2. The heating structure 3 includes a top heating plate 31, a middle heating plate 32, and a bottom heating plate 33. The top heating plate 31 is located between the connecting aluminum busbars 2 and the battery cell body 1. The middle heating plate 32 is longitudinally located between the arrayed battery cell bodies 1 and contacts the side of the battery cell body 1. Its top abuts against the top heating plate 31 and is fixed by locking members that pass through the connecting aluminum busbars 2, the top heating plate 31, and the middle heating plate 32 in sequence. The bottom heating plate 33 is located at the bottom of the battery cell body 1 and is used to support the bottom of the battery cell body 1. The middle heating plate 32 can be plugged into and connected to the bottom heating plate 33 to form a self-supporting three-dimensional heating frame. Fasteners 4 are located between the top heating plate 31 and the bottom heating plate 33 and are used to connect and fix the relative positions of the top heating plate 31 and the bottom heating plate 33, thereby pressing and fixing the heating structure 3 and the battery cell body 1 sandwiched therein into a whole.

[0030] Specifically, the design of the three-dimensional heating frame achieves uniform heating of the battery cell from multiple directions. The top heating plate 31 heats the top electrode area of ​​the battery cell, the middle heating plate 32 provides primary heating to the sides of the battery cell through large-area contact, and the bottom heating plate 33 provides auxiliary heating to the bottom of the battery cell. Together, these three components form a complete three-dimensional heating system. Compared to the single-sided heating scheme of existing technologies, this multi-faceted heating structure significantly increases the heat exchange area, effectively solving the problems of slow internal heating and large temperature gradients in low-temperature environments. The interlocking design of the middle heating plate 32 and the bottom heating plate 33 forms a stable self-supporting frame, which can be pre-positioned during assembly and then finally clamped and fixed using fasteners 4. This ensures the relative positional accuracy of each heating plate and the battery cell while improving assembly efficiency. The axial clamping force provided by the fasteners 4 ensures close contact between each heating plate and the surface of the battery cell, establishing a stable heat conduction path, thereby achieving efficient thermal management.

[0031] In some embodiments, such as Figure 3 As shown, the top heating plate 31 includes a first epoxy heating film 311 and a data acquisition circuit board 312. The first epoxy heating film 311 is disposed on the top of the cell body 1. The data acquisition circuit board 312 is disposed on the top of the first epoxy heating film 311, and its top is provided with a communication interface for communicating with an external battery management system. The data acquisition circuit board 312 is electrically connected to the first epoxy heating film 311, the middle heating plate 32 and the bottom heating plate 33.

[0032] Specifically, this embodiment achieves a compact spatial layout through functional integration design; the first epoxy plate heating film 311 uses an epoxy resin substrate with etched copper foil circuitry, and its edges are provided with heating film output electrodes, which are connected to an external power supply by soldering or plugging; the acquisition circuit board 312 uses a flexible circuit board or a rigid PCB board, and is connected to the temperature sensors and heating circuits of each heating plate through embedded lines, to collect heating status and cell information in real time. This layered integrated design integrates heating function and signal acquisition function into a single component, effectively reducing the number of external wiring harnesses and reducing the risk of short circuits caused by wiring harness crossover; the communication interface of the acquisition circuit board 312 can adopt the form of a standard connector, which facilitates quick docking with the battery management system and realizes intelligent control of the heating process.

[0033] In some embodiments, such as Figure 3 As shown, the top heating plate 31 also includes an insulating heat insulation layer 313, which is disposed between the acquisition circuit board 312 and the first epoxy board heating film 311 to block the heat generated by the first epoxy board heating film 311 from being transferred to the acquisition circuit board 312.

[0034] Specifically, this embodiment ensures system reliability through thermal management optimization; the insulating and heat-insulating layer 313 is bonded between the acquisition circuit board 312 and the first epoxy board heating film 311 with thermally conductive adhesive. This heat-insulating layer can effectively block the upward conduction of heat generated by the lower heating film, preventing the acquisition circuit board 312 from experiencing performance degradation or damage due to overheating; at the same time, the insulating and heat-insulating layer 313 also provides good electrical insulation performance, avoiding mutual interference between the heating circuit and the acquisition circuit; this electrical isolation design ensures the stable operation of the acquisition circuit under high-temperature heating conditions and extends the service life of components.

[0035] In some embodiments, such as Figure 4 As shown, the central heating plate 32 includes a second epoxy heating film 321 and a positioning insertion shaft 322. The second epoxy heating film 321 is disposed between the arrayed battery cell bodies 1, and its top has multiple connection holes for connecting to locking components. The positioning insertion shaft 322 includes multiple shafts, which are evenly disposed at the bottom of the second epoxy heating film 321. The bottom heating plate 33 has multiple insertion holes 301 that are adapted to the shape and position of the positioning insertion shaft 322 for positioning insertion of the second epoxy heating film 321, forming the main support of the self-supporting three-dimensional heating frame in the plane perpendicular to the axial direction.

[0036] Specifically, this embodiment improves assembly accuracy through a precision positioning structure; the second epoxy board heating film 321 can be made of FR-4 epoxy board substrate, with a thick film heating circuit printed on the surface, and its heating film output electrode is set on the side of the board body, and is electrically connected to the adjacent heating plate through spring contacts; the positioning insertion shaft 322 is made of engineering plastic integral injection molding, and is evenly distributed on the bottom of the board body, forming a clearance fit with the precision insertion hole 301 on the bottom heating plate 33. This insertion positioning structure can achieve precise positioning of the middle heating plate before the fastener is tightened, ensuring that the heating plate and the side of the battery cell maintain the best distance; the setting of the connection hole allows the locking part to simultaneously fix the aluminum busbar 2, the top heating plate 31 and the middle heating plate 32, realizing the synchronous fixing of multiple structures.

[0037] In some embodiments, such as Figure 4 As shown, the central heating plate 32 also includes a contoured groove 323. There are multiple contoured grooves 323, which are distributed on both sides of the second epoxy plate heating film 321 corresponding to the battery cell. The multiple contoured grooves 323 are adapted to the side wall of the corresponding battery cell module. When the central heating plate 32 is disposed between the battery cell bodies 1, the side wall of the battery cell body 1 can be embedded in the corresponding contoured groove 323 to increase the contact area between the central heating plate 32 and the side wall of the battery cell body 1.

[0038] Specifically, this embodiment optimizes heat conduction efficiency through contoured contact design; the curvature of the contoured groove 323 matches the outer diameter of the cylindrical battery cell, ensuring that the sidewall of the battery cell can be fully embedded in the groove. Compared with traditional line contact or point contact, this surface contact design significantly increases the contact area between the heating plate and the battery cell, thereby improving heat conduction efficiency; the array distribution of the grooves ensures that each battery cell can obtain a uniform heating effect, avoiding local overheating or underheating; the contoured groove 323 also forms a stable mechanical support between the battery cells, enhancing the overall structural rigidity of the module.

[0039] In some embodiments, such as Figure 4 As shown, the central heating plate 32 also includes an elastic heat-conducting pad 324, which is disposed on the inner wall of the contoured groove 323 to compensate for the assembly tolerance between the battery cell body 1 and the heating plate and to increase the heat-conducting contact area.

[0040] Specifically, this embodiment solves the tolerance compensation problem through an elastic interface material; the elastic thermal pad 324 is made of silicone-based thermal conductive material and is fixed to the inner surface of the contoured groove 323 with adhesive backing. During the tightening of the fasteners, the elastic thermal pad 324 undergoes compression deformation, automatically compensating for the manufacturing tolerances and assembly gaps of the battery cell, ensuring that battery cells of different sizes can maintain close contact with the heating plate; at the same time, the high thermal conductivity of the elastic thermal pad 324 ensures efficient heat transfer, and its elastic properties can also absorb vibration and shock, protecting the battery cell from mechanical damage.

[0041] In some embodiments, such as Figure 5 As shown, the bottom heating plate 33 includes a third epoxy heating film 331 and a reinforcing rib mesh 332. The third epoxy heating film 331 is located at the bottom of the battery cell body 1; the reinforcing rib mesh 332 is distributed on the top surface of the third epoxy heating film 331.

[0042] Specifically, this embodiment improves load-bearing capacity through reinforced structural design; the third epoxy plate heating film 331 is made of high thermal conductivity epoxy composite material, with an embedded serpentine heating circuit, and its heating film output electrode is set at the edge of the plate, and is electrically connected to the central heating plate through a vertical connector; the reinforcing rib grid 332 adopts a rib structure integrally formed with the substrate, which significantly improves the bending stiffness and impact resistance of the bottom heating plate, and can effectively withstand the weight of the battery pack and the vibration load during vehicle operation; the reinforcing rib grid 332 also increases the heat dissipation area and improves the temperature distribution uniformity of the heating plate.

[0043] In some embodiments, such as Figure 5 As shown, the bottom heating plate 33 has a corresponding support groove 302 at the top of the battery cell body 1.

[0044] Specifically, this embodiment optimizes the cell installation accuracy through a positioning structure; the bearing groove 302 is a circular recessed structure with a diameter slightly larger than the outer diameter of the cell. This groove structure can accurately position the bottom of the cell, preventing the cell from shifting during assembly and ensuring that each cell maintains the correct relative position with the upper and lower heating plates; the depth design of the bearing groove 302 ensures sufficient positioning effect while avoiding excessive impact on the contact area between the bottom heating plate and the cell; a thermal grease filling groove can also be set at the bottom of the groove to further improve the heat conduction effect.

[0045] In some embodiments, such as Figure 2 , Figure 5 As shown, the fastener 4 includes locking screws 41 and threaded inserts 42. There are four locking screws 41, which are respectively located at the four corners of the top heating plate 31. There are four threaded inserts 42, which are respectively embedded in the bottom heating plate 33 at the corresponding locking screws 41. By tightening the four locking screws 41, the top heating plate 31 and the bottom heating plate 33 move towards each other, thereby axially pressing and fixing the middle heating plate 32 and the battery cell body 1.

[0046] Specifically, this embodiment ensures structural integrity through a balanced clamping design; the locking screw 41 is made of high-strength alloy steel, and the threaded insert 42 is made of brass, which is pressed into the pre-embedded hole of the bottom heating plate 33 through an interference fit; during assembly, the locking screw 41 passes through the through holes of the top heating plate 31 and the middle heating plate 32 in sequence, and engages with the threaded insert 42 of the bottom heating plate 33, and achieves synchronous tightening through torque control; this four-corner synchronous clamping method can generate a uniform axial preload, ensuring that the force on each layer of components is consistent and avoiding stress concentration caused by unilateral clamping. The design of the threaded insert 42 improves the reusability and fatigue resistance of the threaded connection.

[0047] This utility model also provides a battery pack, including the aforementioned cylindrical cell module; the modular design improves the system performance of the battery pack; multiple sets of cylindrical cell modules are arranged inside the battery pack housing, and each set of modules is connected to the battery management system via a bus. This modular architecture facilitates the flexible configuration and maintenance of the battery pack, and the damage to a single module does not affect the normal operation of other modules; an insulation layer and heat dissipation channels can be set inside the battery pack housing, working in conjunction with the module's three-dimensional heating system to ensure rapid heating in low-temperature environments and effective heat dissipation in high-temperature environments, achieving optimal thermal management under all climate conditions.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cylindrical battery cell module, characterized in that, It includes the battery cell body (1), connecting aluminum busbar (2), heating structure (3), and fasteners (4), wherein, The battery cell body (1) includes multiple cells arranged in an array, and the tops of the multiple battery cell bodies (1) are electrically connected by connecting aluminum busbars (2); The heating structure (3) includes a top heating plate (31), a middle heating plate (32) and a bottom heating plate (33). The top heating plate (31) is located between the aluminum busbar (2) and the battery cell body (1); The central heating plate (32) is longitudinally arranged between the arrayed battery cell bodies (1) and contacts the side of the battery cell body (1). Its top abuts against the top heating plate (31) and is fixed by locking members passing through the connecting aluminum strip (2), the top heating plate (31) and the central heating plate (32) in sequence. The bottom heating plate (33) is located at the bottom of the cell body (1) and is used to support the bottom of the cell body (1). The middle heating plate (32) can be plugged into the bottom heating plate (33) to form a self-supporting three-dimensional heating frame. The fastener (4) is located between the top heating plate (31) and the bottom heating plate (33) to connect and fix the relative positions of the top heating plate (31) and the bottom heating plate (33), thereby pressing and fixing the heating structure (3) and the battery cell body (1) sandwiched therebetween into a whole.

2. The cylindrical battery cell module according to claim 1, characterized in that, The top heating plate (31) includes a first epoxy plate heating film (311) and a data acquisition circuit board (312), wherein, The first epoxy board heating film (311) is disposed on the top of the battery cell body (1); The acquisition circuit board (312) is located on the top of the first epoxy plate heating film (311), and its top is provided with a communication interface for communicating with an external battery management system. The acquisition circuit board (312) is electrically connected to the first epoxy plate heating film (311), the middle heating plate (32) and the bottom heating plate (33).

3. A cylindrical battery cell module according to claim 2, characterized in that, The top heating plate (31) also includes an insulating heat insulation layer (313), which is disposed between the acquisition circuit board (312) and the first epoxy board heating film (311) to block the heat generated by the first epoxy board heating film (311) from being transferred to the acquisition circuit board (312).

4. A cylindrical battery cell module according to claim 1, characterized in that, The central heating plate (32) includes a second epoxy plate heating film (321) and a positioning insert shaft (322), wherein, The second epoxy board heating film (321) is disposed between the arrayed battery cell bodies (1), and its top is provided with multiple connection holes for connecting to the locking components; The positioning insert shaft (322) includes multiple shafts, which are evenly arranged at the bottom of the second epoxy board heating film (321). The bottom heating plate (33) has multiple insertion holes (301) that are adapted to the shape and position of the positioning insert shaft (322) for positioning and inserting the second epoxy board heating film (321) to form the main support of the self-supporting three-dimensional heating frame in the plane perpendicular to the axial direction.

5. A cylindrical battery cell module according to claim 4, characterized in that, The central heating plate (32) also includes a contoured groove (323), which includes multiple contoured grooves (323) distributed on both sides of the second epoxy plate heating film (321) corresponding to the battery cell. The multiple contoured grooves (323) are adapted to the side wall of the corresponding battery cell module. When the central heating plate (32) is disposed between the battery cell bodies (1), the side wall of the battery cell body (1) can be embedded in the corresponding contoured groove (323) to increase the contact area between the central heating plate (32) and the side wall of the battery cell body (1).

6. A cylindrical battery cell module according to claim 5, characterized in that, The central heating plate (32) also includes an elastic heat-conducting pad (324), which is disposed on the inner wall of the contoured groove (323) to compensate for the assembly tolerance between the battery cell body (1) and the heating plate and to increase the heat-conducting contact area.

7. A cylindrical battery cell module according to claim 1, characterized in that, The bottom heating plate (33) includes a third epoxy board heating film (331) and a reinforcing rib grid (332), wherein, The third epoxy plate heating film (331) is located at the bottom of the battery cell body (1); The reinforcing mesh (332) is distributed on the top surface of the third epoxy plate heating film (331).

8. A cylindrical battery cell module according to claim 7, characterized in that, The bottom heating plate (33) has a corresponding support groove (302) at the top of the battery cell body (1).

9. A cylindrical battery cell module according to claim 1, characterized in that, The fastener (4) includes a locking screw (41) and a threaded insert (42), wherein, The locking screws (41) include four, which are respectively located at the four corners of the top heating plate (31); The threaded inserts (42) include four, which are pre-embedded in the bottom heating plate (33) at the corresponding locking screws (41); By tightening the four locking screws (41), the top heating plate (31) and the bottom heating plate (33) move toward each other, thereby axially pressing and fixing the middle heating plate (32) and the battery cell body (1).

10. A battery pack, characterized in that, Includes a cylindrical battery cell module according to any one of claims 1-9.

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