Battery heating film

Abstract

The application provides a battery heating film, which comprises, from top to bottom, an upper heat-conducting silica gel sheet, an electric heating film element and a lower heat-conducting silica gel sheet, the upper heat-conducting silica gel sheet and the lower heat-conducting silica gel sheet are respectively provided with a first extension part and a second extension part at two ends thereof, the first extension part is provided with a first clamping hole, and the second extension part is provided with a second clamping hole; the upper heat-conducting silica gel sheet is provided with a pressing plate assembly, the pressing plate assembly is formed by flexibly connecting a plurality of segmented pressing plate modules through an elastic interconnection structure allowing adjacent segmented pressing plate modules to produce relative displacement in the arrangement direction of the segmented pressing plate modules, the segmented pressing plate modules comprise a plurality of middle pressing plate modules located in the middle and two end pressing plate modules located at two ends, the bottom of the middle pressing plate module is provided with a cavity, a shape memory alloy push rod is arranged in the cavity, the lower end of the shape memory alloy push rod is connected with a first pressing block, and the first pressing block is in contact with the upper heat-conducting silica gel sheet.

Description

Technical Field

[0001] This invention relates to the field of devices for directly converting chemical energy into electrical energy, and particularly to battery heating films. Background Technology

[0002] Battery heating films are key components of the thermal management system for new energy vehicles. They are mainly used to preheat power batteries in low-temperature environments to maintain their charging and discharging performance and operational safety. Traditional battery heating films generally adopt a laminated structure in which an electric heating film element is sandwiched between upper and lower thermally conductive silicone sheets, and is pressed together as a whole by an external fixing device.

[0003] For example, patent document CN217768530U discloses a deformation-resistant battery heating element. It utilizes an integral pressure plate with protrusions to insert silicone sheet locking holes, which are then secured by connectors. While this improves structural bending strength and reduces initial assembly gaps, it still has the following limitations: the clamping force is statically fixed and cannot adapt to the volume changes of the silicone material caused by temperature cycling during battery operation. Thermally conductive silicone has a high coefficient of thermal expansion, resulting in significant expansion or contraction during temperature fluctuations. Under high-temperature conditions, silicone expansion weakens the contact pressure between the pressure plate and the silicone sheet, creating localized gaps that hinder efficient heat conduction and reduce heating efficiency. Under low-temperature conditions, silicone contraction causes excessive pressure concentration in specific areas, accelerating material fatigue damage and potentially leading to permanent localized deformation. Furthermore, the surface temperature distribution of battery modules is typically uneven, and the integral pressure plate cannot adjust according to the degree of thermal deformation in each area. This results in stress concentration and warping in areas with large temperature gradients, further deteriorating heating uniformity and affecting the long-term reliability and safety stability of the battery system. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned technical problems by providing a battery heating film.

[0005] The technical solution of the present invention is a battery heating film, comprising an upper thermally conductive silicone sheet, an electric heating film element, and a lower thermally conductive silicone sheet arranged sequentially from top to bottom. The upper thermally conductive silicone sheet and the lower thermally conductive silicone sheet are respectively provided with a first extension and a second extension at both ends. The first extension is provided with a first snap-fit ​​hole, and the second extension is provided with a second snap-fit ​​hole.

[0006] The upper thermally conductive silicone sheet is provided with a pressure plate assembly. The pressure plate assembly is formed by multiple segmented pressure plate modules flexibly connected by an elastic interconnection structure that allows adjacent segmented pressure plate modules to generate relative displacement in the arrangement direction of the segmented pressure plate modules. The segmented pressure plate module includes multiple intermediate pressure plate modules located in the middle and two end pressure plate modules located at both ends. The bottom of the intermediate pressure plate module is provided with a cavity. A shape memory alloy push rod is provided in the cavity. The lower end of the shape memory alloy push rod is connected to a first clamping block. The first clamping block is in contact with the upper thermally conductive silicone sheet.

[0007] The end plate module is provided with a second clamping block at its bottom. The second clamping block is a screw. The screw passes through the second snap-fit ​​hole and the first snap-fit ​​hole from bottom to top and extends into the end plate module. The screw is connected to a threaded fastener to press the end plate module onto the upper thermally conductive silicone sheet.

[0008] In one embodiment, the elastic interconnection structure is an elastic connecting strip. The end pressure plate module has a connecting part on its side facing the middle pressure plate module, and the middle pressure plate module has connecting parts on both sides of its two ends. Adjacent segmented pressure plate modules are connected by the elastic connecting strip through their opposite connecting parts.

[0009] In one implementation, the adjacent segmented pressure plate modules are provided with mutually cooperating lateral positioning structures on their opposite sides. The lateral positioning structure includes a positioning tenon on one side and a positioning groove on the other side. The positioning tenon and the positioning groove are engaged to make the segmented pressure plate modules laterally aligned.

[0010] In one embodiment, the positioning tenon is cylindrical, the positioning groove is a circular blind hole, and the depth of the positioning groove is greater than the height of the positioning tenon, so that there is a longitudinal gap after the two are fitted together.

[0011] In one embodiment, the intermediate pressure plate module is provided with a heat dissipation window that penetrates its body, and the outline of the heat dissipation window is approximately the same as the outer outline of the intermediate pressure plate module body; there are two cavities, which are respectively provided at both ends of the heat dissipation window along the length direction, and the shape memory alloy push rod and the first clamping block are provided in each cavity.

[0012] In one embodiment, two shape memory alloy push rods are provided in each cavity. The shape memory alloy push rod is a long strip structure with two curved parts. The upper surface of the intermediate pressure plate module is provided with a mounting slot communicating with the cavity. The upper end of the shape memory alloy push rod is locked in the mounting slot. The first clamping block is provided with a limit slot. The lower end of the shape memory alloy push rod is locked in the limit slot.

[0013] As one implementation, it also includes a temperature sensing element, which is embedded in the upper thermally conductive silicone sheet or the lower thermally conductive silicone sheet and corresponds to the position of the electrothermal film element.

[0014] As one implementation, a shock-absorbing mesh is also included, which is laid between the upper thermally conductive silicone sheet and the pressure plate assembly, and covers the area where the electrothermal film element is located.

[0015] In one embodiment, the surface of the first clamping block that contacts the upper thermally conductive silicone sheet is provided with textures to increase friction.

[0016] In one embodiment, the segmented pressure plate module has reinforcing ribs extending along its length on the side facing away from the upper thermally conductive silicone sheet.

[0017] The advantages of this invention compared to existing technologies are that the battery heating film, through segmented pressure plate modules, an elastic interconnection structure, and the thermal response drive of shape memory alloy push rods, solves the problems of traditional fixed clamping methods being unable to adapt to thermal expansion and contraction, and prone to gaps and fatigue after long-term use. First, the shape memory alloy push rods allow the clamping force to dynamically adjust with temperature, automatically compensating for the expansion of the silicone sheet at high temperatures and appropriately releasing the clamping force at low temperatures. Second, the elastic interconnection structure allows adjacent segmented pressure plate modules to shift, absorbing internal stress caused by asynchronous local thermal responses and preventing overall warping and stress concentration. The combination of these two features achieves independent adaptive adjustment of each segmented pressure plate module and overall stability of the pressure plate assembly, avoiding the warping or stress concentration problems caused by local deformation in traditional integral pressure plates. Attached Figure Description

[0018] Figure 1 A schematic diagram of the overall structure of the battery heating film provided in an embodiment of the present invention;

[0019] Figure 2 A first structural schematic diagram of the pressure plate assembly of the battery heating film provided in an embodiment of the present invention;

[0020] Figure 3 for Figure 2 Enlarged view of part A of the pressure plate assembly provided in the document;

[0021] Figure 4 A second structural schematic diagram of the pressure plate assembly of the battery heating film provided in an embodiment of the present invention;

[0022] Figure 5 for Figure 4 Enlarged view of part B of the pressure plate assembly provided in the document.

[0023] In the diagram: 1. Upper thermally conductive silicone sheet; 2. Electrothermal film element; 3. Lower thermally conductive silicone sheet; 4. First extension; 5. Second extension; 6. First snap-fit ​​hole; 7. Second snap-fit ​​hole; 8. Pressure plate assembly; 9. Segmented pressure plate module; 91. Middle pressure plate module; 92. End pressure plate module; 10. Cavity; 11. Shape memory alloy push rod; 12. First clamping block; 13. Second clamping block; 14. Threaded fastener; 15. Elastic connecting strip; 16. Connecting part; 17. Positioning tenon; 18. Positioning groove; 19. Heat dissipation window; 20. Mounting through groove; 21. Limiting slot; 22. Reinforcing rib. Detailed Implementation

[0024] The above and other embodiments and advantages of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] In one implementation, such as Figures 1 to 3 As shown.

[0026] The battery heating film provided in this embodiment includes an upper thermally conductive silicone sheet 1, an electric heating film element 2, and a lower thermally conductive silicone sheet 3 arranged sequentially from top to bottom. The upper and lower thermally conductive silicone sheet 1 and the lower thermally conductive silicone sheet 3 are respectively provided with a first extension 4 and a second extension 5 at their ends. The first extension 4 has a first snap-fit ​​hole 6, and the second extension 5 has a second snap-fit ​​hole 7. The upper thermally conductive silicone sheet 1 is provided with a pressure plate assembly 8. The pressure plate assembly 8 is flexibly connected by a multiple segmented pressure plate modules 9 through an elastic interconnection structure that allows relative displacement between adjacent segmented pressure plate modules 9 in the arrangement direction of the segmented pressure plate modules 9. The segmented pressure plate module 9 includes a middle segmented pressure plate module 9. Multiple intermediate pressure plate modules 91 and two end pressure plate modules 92 located at both ends. The bottom of the intermediate pressure plate module 91 is provided with a cavity 10, and a shape memory alloy push rod 11 is provided in the cavity 10. The lower end of the shape memory alloy push rod 11 is connected to a first clamping block 12, and the first clamping block 12 is in contact with the upper thermal conductive silicone sheet 1. The bottom of the end pressure plate module 92 is provided with a second clamping block 13, which is a screw. The screw passes through the second snap-fit ​​hole 7 and the first snap-fit ​​hole 6 from bottom to top and extends into the end pressure plate module 92. A threaded fastener 14 is connected to the screw to press the end pressure plate module 92 onto the upper thermal conductive silicone sheet 1.

[0027] In this embodiment, a battery heating film is installed to ensure the battery operates normally in cold environments. The battery heating film consists of an upper thermally conductive silicone sheet 1, a heating film element 2, and a lower thermally conductive silicone sheet 3, stacked sequentially from top to bottom. The upper and lower thermally conductive silicone sheets 1 and 3 each extend to a first extension 4 and a second extension 5, respectively. The first extension 4 has a first snap-fit ​​hole 6, and the second extension 5 has a second snap-fit ​​hole 7. These holes are used to secure the battery heating film. Above the upper thermally conductive silicone sheet 1, a pressure plate assembly 8 is provided. This pressure plate assembly 8 applies pressure to the upper and lower thermally conductive silicone sheets 1 and 3, ensuring a tight fit with the battery surface and improving thermal conductivity.

[0028] Unlike existing pressure plates, this pressure plate assembly 8 is not a single-piece structure, but rather a flexible connection of multiple segmented pressure plate modules 9. These segmented pressure plate modules 9 include multiple intermediate pressure plate modules 91 located in the middle and two end pressure plate modules 92 located at both ends. Adjacent segmented pressure plate modules 9 are connected by an elastic interconnection structure. This flexible connection allows adjacent segmented pressure plate modules 9 to undergo relative displacement in the arrangement direction, thereby enabling the pressure plate assembly 8 to adapt to any local unevenness or deformation that may exist on the battery surface.

[0029] During the installation of the battery heating film, it is first initially fixed by the end pressure plate module 92. The end pressure plate module 92 has a second clamping block 13 at its bottom, which is a screw. The screw passes through the second snap-fit ​​hole 7 of the lower thermally conductive silicone sheet 3 and the first snap-fit ​​hole 6 of the upper thermally conductive silicone sheet 1 from bottom to top, and extends into the end pressure plate module 92. Subsequently, the end pressure plate module 92 is pressed onto the upper thermally conductive silicone sheet 1 by the threaded fastener 14 connected to the screw, providing initial fixing force for the entire heating film.

[0030] The intermediate pressure plate module 91 is key to achieving dynamic clamping. Each intermediate pressure plate module 91 has a cavity 10 at its bottom. For example, to apply pressure more evenly, each intermediate pressure plate module 91 may have two cavities 10 at both ends along its length. A shape memory alloy push rod 11 is installed within each cavity 10. The lower end of the shape memory alloy push rod 11 is connected to a first clamping block 12, which is in direct contact with the upper thermally conductive silicone sheet 1. During temperature cycling, the shape memory alloy push rod 11 can dynamically adjust its thrust on the first clamping block 12, thereby adaptively compensating for the thermal expansion and contraction of the silicone sheet, maintaining a stable and appropriate clamping force, and avoiding gaps and overpressure.

[0031] More importantly, the elastic interconnection structure between the segmented pressure plate modules 9, together with the independent thermal response drive of each segmented pressure plate module 9, constitutes a collaborative system. Due to potential uneven temperature distribution on the battery surface or slight differences in the operating states of the various electrothermal film elements 2, the degree of local thermal expansion of the silicone sheets under different intermediate pressure plate modules 91 may vary, resulting in the shape memory alloy push rods 11 within each intermediate pressure plate module 91 not being completely synchronized in deformation. If the intermediate pressure plate modules 91 are rigidly connected, this asynchrony in the local push rod movements will create mutual tensile internal stress between the modules, easily leading to twisting and warping of the entire pressure plate assembly 8. Therefore, by setting an elastic interconnection structure, adjacent intermediate pressure plate modules 91 are allowed to produce slight relative displacements in the arrangement direction, thereby absorbing and releasing the internal stress caused by the asynchronous local thermal response. This resolves the contradiction between local self-adaptation and overall stability, avoiding stress concentration and warping.

[0032] In one implementation, such as Figures 4 to 5 As shown.

[0033] The battery heating film provided in this embodiment has an elastic interconnection structure of elastic connecting strip 15. The end pressure plate module 92 has a connecting part 16 on one side facing the middle pressure plate module 91. The middle pressure plate module 91 has connecting parts 16 on both sides of its two ends. Adjacent segmented pressure plate modules 9 are connected by elastic connecting strip 15 through their opposite connecting parts 16.

[0034] In this embodiment, the elastic connecting strip 15 is a strip-shaped structure with a certain degree of elasticity. Its main function is to provide recoverable deformation capability, allowing relative displacement between the two connected parts within a certain range, and returning to its original shape after the external force is removed. The connecting part 16 can be designed in various forms, such as protrusions, snaps, or mounting seats, to facilitate the fixing and disassembly of the elastic connecting strip 15. Its function is to provide a stable attachment point for the elastic connecting strip 15, ensuring a firm and reliable connection between the segmented pressure plate modules 9. By specifically implementing the above-mentioned elastic interconnection structure as the elastic connecting strip 15, and cooperating with the connecting part 16 provided on the segmented pressure plate module 9, a reliable and controllable flexible connection between the segmented pressure plate modules 9 is achieved. The elastic deformation characteristics of the elastic connecting strip 15 enable adjacent segmented pressure plate modules 9 to effectively absorb and buffer relative displacement caused by thermal expansion and contraction of the battery heating film or external vibration, thereby avoiding stress concentration and structural fatigue that may be caused by rigid connections.

[0035] In one implementation, such as Figures 4 to 5 As shown.

[0036] The battery heating film provided in this embodiment has lateral positioning structures that cooperate with each other on the opposite sides of the adjacent segmented pressure plate modules 9. The lateral positioning structure includes a positioning tenon 17 on one side and a positioning groove 18 on the other side. The positioning tenon 17 and the positioning groove 18 are fitted together to make the segmented pressure plate modules 9 laterally aligned.

[0037] In this embodiment, the lateral positioning structure ensures that adjacent segmented pressure plate modules 9 maintain precise lateral alignment while preserving flexible connection characteristics, effectively preventing uneven clamping force and component wear caused by lateral misalignment. This structure includes a positioning tenon 17 on one side and a positioning groove 18 on the other side, with the positioning tenon 17 engaging with the positioning groove 18 to effectively limit the relative lateral displacement of the segmented pressure plate modules 9. This ensures that while the pressure plate assembly 8 is flexibly connected by the elastic connecting strip 15 and allows relative displacement of the segmented pressure plate modules 9 in the arrangement direction to accommodate the thermal expansion and contraction of the battery pack, each segmented pressure plate module 9 maintains precise lateral alignment. This not only improves the overall structural stability of the pressure plate assembly 8, preventing uneven clamping or component damage caused by lateral misalignment, but also ensures uniform clamping of the battery heating film, thereby improving the working efficiency and service life of the battery heating film.

[0038] In one implementation, such as Figures 4 to 5 As shown.

[0039] The battery heating film provided in this embodiment has a cylindrical positioning protrusion 17 and a circular blind hole positioning groove 18. The depth of the positioning groove 18 is greater than the height of the positioning protrusion 17, so that there is a longitudinal gap after the two are fitted together.

[0040] In this embodiment, the cylindrical positioning tenon 17 has good symmetry and is easy to mate with the positioning groove 18. Its smooth surface helps reduce friction during the fitting process, ensuring smooth relative movement of the segmented pressure plate module 9. The circular blind hole complements the cylindrical positioning tenon 17, effectively receiving and accommodating it. The depth of the blind hole is controllable, providing a structural basis for achieving subsequent longitudinal clearance. By making the depth of the positioning groove 18 exceed the height of the positioning tenon 17, the top of the positioning tenon 17 will not touch the bottom of the positioning groove 18 when the two are fitted, thus forming a reserved gap in the longitudinal direction. This longitudinal gap allows the positioning tenon 17 to float within a certain range of longitudinal movement within the positioning groove 18.

[0041] In one implementation, such as Figures 3 to 4 As shown.

[0042] The battery heating film provided in this embodiment has a heat dissipation window 19 that penetrates its body on the middle pressure plate module 91. The outline of the heat dissipation window 19 is approximately the same as the outer outline of the body of the middle pressure plate module 91. There are two cavities 10, which are respectively set at both ends of the heat dissipation window 19 along the length direction. Each cavity 10 is provided with a shape memory alloy push rod 11 and a first pressing block 12.

[0043] In this embodiment, the heat dissipation window 19 provided on the intermediate pressure plate module 91 is an opening structure that penetrates its entire body, and its main function is to enhance the heat dissipation capacity of the intermediate pressure plate module 91. The outline of the heat dissipation window 19 is approximately the same as the outer outline of the intermediate pressure plate module 91 body, which means that the heat dissipation window 19 occupies a large area of ​​the intermediate pressure plate module 91 body, thereby maximizing the effective size of the heat dissipation channel. Two cavities 10 are provided, and these two cavities 10 are respectively provided at both ends of the heat dissipation window 19 along the length direction. This double cavity 10 layout allows the shape memory alloy push rod 11 and the first clamping block 12 to apply pressure to the upper thermally conductive silicone sheet 1 from two opposite positions of the intermediate pressure plate module 91. Compared with the arrangement of a single cavity 10 and push rod, the double cavity 10 design can provide a more balanced and stable clamping force distribution, effectively avoiding the problem of uneven clamping or local stress concentration that may be caused by single-point force.

[0044] In one implementation, such as Figure 3 As shown.

[0045] The battery heating film provided in this embodiment has two shape memory alloy push rods 11 in each cavity 10. The shape memory alloy push rod 11 is a long strip structure with two curved parts. The upper surface of the middle pressure plate module 91 is provided with a mounting groove 20 that communicates with the cavity 10. The upper end of the shape memory alloy push rod 11 is locked in the mounting groove 20. The first pressing block 12 is provided with a limiting groove 21. The lower end of the shape memory alloy push rod 11 is locked in the limiting groove 21.

[0046] In this embodiment, by providing two shape memory alloy push rods 11 within each cavity 10, the force on a single push rod can be effectively distributed, enhancing the overall stability of the clamping mechanism. These two push rods can be arranged side-by-side or distributed at a certain interval to ensure more uniform and stable support and driving force for the first clamping block 12. The shape memory alloy push rods 11 typically undergo a phase change due to temperature variations, resulting in deformation and thrust. Using a long strip structure with two bends, such as an S-shape, can significantly increase the effective deformation stroke of the shape memory alloy push rods 11, thereby providing greater thrust or longer displacement within a limited space. To ensure the stable installation of the shape memory alloy push rods 11, an installation through-slot 20 communicating with the cavity 10 is provided on the upper surface of the intermediate pressure plate module 91. This through-slot can achieve a locking or limiting function. Similarly, a limiting slot 21 is provided on the first clamping block 12, the shape and size of which should match the lower end of the push rod. With the locking mechanism at both ends, the shape memory alloy push rod 11 maintains good stability throughout its entire working stroke.

[0047] In one implementation, such as Figure 4 As shown.

[0048] The battery heating film provided in this embodiment has a reinforcing rib 22 extending along its length on one side of the back-facing heat-conducting silicone sheet 1 of the segmented pressure plate module 9.

[0049] In this embodiment, the stiffener 22 is a structural reinforcement design that increases the stiffness and strength of the component by increasing the moment of inertia of its cross section. The stiffener 22 extends along the length of the segmented pressure plate module 9 and can effectively resist the bending deformation of the module under pressure, thereby improving its overall rigidity.

[0050] In other embodiments, to better monitor and control the heating process, the battery heating film also includes a temperature sensing element. This element can be embedded within the upper thermally conductive silicone sheet 1 or the lower thermally conductive silicone sheet 3, and corresponds to the position of the electrothermal film element 2, monitoring the temperature of the heating area in real time. To improve overall reliability and shock resistance, a shock-absorbing mesh can be laid between the upper thermally conductive silicone sheet 1 and the pressure plate assembly 8, covering the area where the electrothermal film element 2 is located, providing additional protection for the electrothermal film element 2. To improve the clamping effect, the surface of the first clamping block 12 that contacts the upper thermally conductive silicone sheet 1 can be provided with textures to increase friction, ensuring that the clamping force can be effectively transmitted and preventing slippage.

[0051] The specific embodiments described above further illustrate the inventive purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, or improvements made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A battery heating film, characterized in that, It includes an upper thermally conductive silicone sheet, an electrothermal film element, and a lower thermally conductive silicone sheet arranged sequentially from top to bottom. The upper thermally conductive silicone sheet and the lower thermally conductive silicone sheet are respectively provided with a first extension and a second extension at both ends. The first extension is provided with a first snap-fit ​​hole, and the second extension is provided with a second snap-fit ​​hole. The upper thermally conductive silicone sheet is provided with a pressure plate assembly. The pressure plate assembly is formed by multiple segmented pressure plate modules flexibly connected by an elastic interconnection structure that allows adjacent segmented pressure plate modules to generate relative displacement in the arrangement direction of the segmented pressure plate modules. The segmented pressure plate module includes multiple intermediate pressure plate modules located in the middle and two end pressure plate modules located at both ends. The bottom of the intermediate pressure plate module is provided with a cavity. A shape memory alloy push rod is provided in the cavity. The lower end of the shape memory alloy push rod is connected to a first clamping block. The first clamping block is in contact with the upper thermally conductive silicone sheet. The end plate module is provided with a second clamping block at the bottom. The second clamping block is a screw. The screw passes through the second snap-fit ​​hole and the first snap-fit ​​hole from bottom to top and extends into the end plate module. The screw is connected to a threaded fastener to press the end plate module onto the upper thermally conductive silicone sheet. The cavity comprises two parts, respectively located at both ends of the intermediate pressure plate module body along its length. Each cavity contains a shape memory alloy push rod and the first clamping block. Each cavity contains two shape memory alloy push rods, each push rod being a long strip structure with two curved sections. The upper surface of the intermediate pressure plate module has an installation slot communicating with the cavity. The upper end of the shape memory alloy push rod is engaged in the installation slot. The first clamping block has a limiting slot, and the lower end of the shape memory alloy push rod is engaged in the limiting slot.

2. The battery heating film according to claim 1, characterized in that, The elastic interconnection structure is an elastic connecting strip. The end pressure plate module has a connecting part on its side facing the middle pressure plate module. The middle pressure plate module has connecting parts on both sides of its two ends. Adjacent segment pressure plate modules are connected by the elastic connecting strip through their opposite connecting parts.

3. The battery heating film according to claim 2, characterized in that, The adjacent segmented pressure plate modules are provided with mutually cooperating lateral positioning structures on their opposite sides. The lateral positioning structure includes a positioning tenon on one side and a positioning groove on the other side. The positioning tenon and the positioning groove are engaged to make the segmented pressure plate modules laterally aligned.

4. The battery heating film according to claim 3, characterized in that, The positioning tenon is cylindrical, and the positioning groove is a circular blind hole. The depth of the positioning groove is greater than the height of the positioning tenon, so that there is a longitudinal gap after the two are fitted together.

5. The battery heating film according to claim 1, characterized in that, The intermediate pressure plate module is provided with a heat dissipation window that runs through its body, and the outline of the heat dissipation window is approximately the same as the outer outline of the intermediate pressure plate module body.

6. The battery heating film according to claim 1, characterized in that, It also includes a temperature sensing element, which is embedded in the upper or lower thermally conductive silicone sheet and corresponds to the position of the electrothermal film element.

7. The battery heating film according to claim 1, characterized in that, It also includes a shock-absorbing mesh, which is laid between the upper thermally conductive silicone sheet and the pressure plate assembly, and covers the area where the electrothermal film element is located.

8. The battery heating film according to claim 1, characterized in that, The surface of the first clamping block that contacts the upper thermally conductive silicone sheet has textures to increase friction.

9. The battery heating film according to claim 1, characterized in that, The segmented pressure plate module has reinforcing ribs extending along its length on the side facing away from the upper thermally conductive silicone sheet.

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