Battery pack heating film, battery pack and vehicle

Abstract

The invention provides a battery pack heating film, a battery pack and a vehicle, and relates to the technical field of heating films. A heating core in the battery pack heating film comprises a first electrode plate and a second electrode plate which are oppositely arranged in a first direction, and a heating film layer located between the first electrode plate and the second electrode plate. According to the structure of the heating core body, current can vertically flow through the heating film layer, heat is uniformly generated according to the power requirement, and the effect of heating the battery pack is achieved. Compared with the prior art, the battery pack heating film has the advantages that an existing heating film plane circuit mode is changed, a vertical circuit structure is designed, the production cost of the battery pack heating film is reduced, and the functionality, the safety and the customizability of the battery pack heating film are improved. And different numbers of heating core bodies are placed according to different heating areas, so that the battery pack heating film can meet the heating requirements of different areas of the same battery pack.

Description

Technical Field

[0001] The present application relates to the technical field of heating films, and in particular to a battery pack heating film, a battery pack and a vehicle. Background Art

[0002] With the rapid development of electric vehicle technology and market, people have higher and higher expectations for the performance of electric vehicles, and manufacturers have also put forward certain requirements on the process and manufacturing cost of electric vehicle components.

[0003] At present, electric vehicles generally use lithium batteries as a way to store energy. Generally speaking, lithium batteries work best at 20℃-40℃, and perform poorly in other low-temperature environments such as winter, making them less competitive than fuel vehicles. In low-temperature environments, the electrochemical reaction rate of the battery pack slows down, and the performance of the battery pack will drop significantly, resulting in a decrease in the battery pack's capacity and a decrease in the vehicle's endurance. When the car is started, the battery pack needs to be heated by certain means so that the battery pack can quickly enter the working state and ensure the good operation of the car.

[0004] Therefore, how to optimize the structure of the battery pack heating film to improve the heating effect on the battery pack is a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] In view of the above problems, the present application provides a battery pack heating film, a battery pack and a vehicle to achieve the purpose of improving the heating effect of the battery pack. The specific scheme is as follows:

[0006] A first aspect of the present application provides a battery pack heating film, the battery pack heating film comprising:

[0007] A first substrate and a second substrate are arranged opposite to each other in a first direction, wherein the first direction is perpendicular to a plane where the first substrate is located or perpendicular to a plane where the second substrate is located;

[0008] A plurality of heat generating cores located between the first substrate and the second substrate; the heat generating cores include a first electrode sheet and a second electrode sheet arranged opposite to each other in the first direction, and a heat generating film layer located between the first electrode sheet and the second electrode sheet;

[0009] The area between the first substrate and the second substrate is divided into a plurality of independent heating areas, and the number of heat generating cores placed in at least two of the heating areas is different.

[0010] Preferably, in the above-mentioned battery pack heating film, the areas of the heating film layers in at least two of the heating cores are different.

[0011] Preferably, in the above-mentioned battery pack heating film, the thickness of the heating film layer in at least two of the heating cores is different.

[0012] Preferably, in the above-mentioned battery pack heating film, a limiting component is provided on the first substrate and / or the second substrate;

[0013] The heating core is installed in the limiting assembly.

[0014] Preferably, in the above-mentioned battery pack heating film, the battery pack heating film further comprises: a packaging component;

[0015] The packaging assembly is used to perform edge sealing processing on the first substrate and the second substrate, and a vacuum state is formed between the first substrate and the second substrate.

[0016] Preferably, in the above-mentioned battery pack heating film, the heating film layer is a conductive adhesive film layer.

[0017] Preferably, in the above-mentioned battery pack heating film, the first electrode sheet and the second electrode sheet are stainless steel electrode sheets.

[0018] Preferably, in the above-mentioned battery pack heating film, the heating film layer is a carbon film layer.

[0019] A second aspect of the present application provides a battery pack, the battery pack comprising the battery pack heating film as described in any one of the above items;

[0020] The number of the battery pack heating films is N, N≥1, and N is a positive integer.

[0021] A third aspect of the present application provides a vehicle, comprising a battery pack as claimed in claim 9.

[0022] By means of the above technical solution, the present application provides a battery pack heating film, a battery pack and a vehicle, wherein the heating core in the battery pack heating film includes a first electrode sheet and a second electrode sheet arranged opposite to each other in the first direction, and a heating film layer located between the first electrode sheet and the second electrode sheet. The structure of the heating core enables the current to flow vertically through the heating film layer, generating heat evenly according to the power requirements, thereby achieving the effect of heating the battery pack. This is equivalent to changing the existing planar circuit mode of the heating film, designing a vertical circuit structure, reducing the production cost of the battery pack heating film, and improving the functionality, safety and customizability of the battery pack heating film. And different numbers of heating cores are placed for different heating areas, so that the battery pack heating film can meet the heating requirements of different areas of the same battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the originals and elements are not necessarily drawn to scale.

[0024] Figure 1 A schematic diagram of a partial structure of a battery pack heating film provided by an embodiment of the present invention;

[0025] Figure 2 A partial structural schematic diagram of another battery pack heating film provided by an embodiment of the present invention;

[0026] Figure 3 A partial structural schematic diagram of another battery pack heating film provided by an embodiment of the present invention;

[0027] Figure 4 A schematic diagram of the structure of a heating core provided by an embodiment of the present invention;

[0028] Figure 5 A schematic diagram of the arrangement of a heat generating chip array provided by an embodiment of the present invention;

[0029] Figure 6 A schematic diagram of another arrangement of a heat generating chip array provided by an embodiment of the present invention;

[0030] Figure 7 A schematic diagram of the arrangement of another heating core array provided in an embodiment of the present invention;

[0031] Figure 8 A schematic diagram of heating demand zones for a battery pack provided in an embodiment of the present invention;

[0032] Fig. 9 A schematic diagram of a vehicle provided in accordance with an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application. The terms used in the implementation method section of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application. It is known to those of ordinary skill in the art that with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems. It should be noted that the directional words appearing in the present invention are based on the relative position relationship shown in the drawings and cannot be used as an absolute limitation on the present application.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] refer to Figure 1 , Figure 1 A partial structural schematic diagram of a battery pack heating film provided by an embodiment of the present invention, referring to Figure 2 , Figure 2 A partial structural diagram of another battery pack heating film provided by an embodiment of the present invention, referring to Figure 3 , Figure 3 A partial structural diagram of another battery pack heating film provided in an embodiment of the present invention, referring to Figure 4 , Figure 4 A schematic diagram of the structure of a heating core provided by an embodiment of the present invention. The battery pack heating film provided by an embodiment of the present invention includes:

[0036] The first substrate 11 and the second substrate 12 are arranged opposite to each other in a first direction, and the first direction is perpendicular to the plane where the first substrate 11 is located or perpendicular to the plane where the second substrate 12 is located.

[0037] A plurality of heat generating cores 13 are located between the first substrate 11 and the second substrate 12 ; the heat generating cores 13 include a first electrode sheet 21 and a second electrode sheet 22 arranged opposite to each other in the first direction, and a heat generating film layer 23 located between the first electrode sheet 21 and the second electrode sheet 22 .

[0038] The area between the first substrate 11 and the second substrate 12 is divided into a plurality of independent heating areas 15 , and the number of the heating cores 13 placed in at least two of the heating areas 15 is different.

[0039] Specifically, in the embodiment of the present invention, the plane where the first substrate 11 is located, the plane where the second substrate 12 is located, the plane where the first electrode sheet 21 is located, the plane where the second electrode sheet 22 is located, and the plane where the heating film layer 23 is located are in a parallel state. The heating core 13 is a heating core 13 of a sandwich structure consisting of two layers of electrode sheets and the heating film layer 23 therebetween.

[0040] The heating core 13 in the battery pack heating film includes a first electrode sheet 21 and a second electrode sheet 22 arranged opposite to each other in the first direction, and a heating film layer 23 located between the first electrode sheet 21 and the second electrode sheet 22. The structure of the heating core 13 enables the current to flow vertically through the heating film layer 23, evenly generating heat according to the power requirements, so as to achieve the effect of heating the battery pack. This is equivalent to changing the existing planar circuit mode of the heating film, designing a vertical circuit structure, reducing the production cost of the battery pack heating film, and improving the functionality, safety and customizability of the battery pack heating film. And different numbers of heating cores are placed for different heating areas, so that the battery pack heating film can meet the heating requirements of different areas of the same battery pack.

[0041] Take the case where the electrode sheet is a stainless steel electrode sheet and the heating film layer 23 is a conductive film layer as an example for explanation:

[0042] According to the heating requirements, a layer of conductive glue is printed on one of the stainless steel electrode sheets between the two stainless steel electrode sheets by a planar processing method such as screen printing to form a conductive glue film layer, which serves as both a heating material and a bonding material. After bonding, the stainless steel electrode sheet with the conductive glue film layer is cut into individual small heating cores 13 by stamping and other methods according to the heating requirements. The heating core 13 is small in size, low in cost, can be mass-produced, and can be directly replaced if damaged. The electrode sheet made of stainless steel can be used as an electrode for electrical and thermal conductivity, can protect the internal conductive glue film layer from damage, and increase the service life of the heating core 13.

[0043] Take the electrode sheet as a stainless steel electrode sheet and the heating film layer 23 as a carbon film layer as an example for explanation:

[0044] Between two stainless steel electrode sheets, according to heating requirements, a layer of carbon paste is printed on one of the stainless steel electrode sheets by a planar processing method such as screen printing to form a carbon film layer. A thermosetting adhesive can also be printed in the gap between the printed carbon paste, and the two stainless steel electrode sheets are bonded by a hot pressing process. After bonding, the stainless steel electrode sheets with the carbon film layer are cut into individual small heating cores 13 by stamping and other methods according to heating requirements. The heating core 13 is small in size, low in cost, can be mass-produced, and can be directly replaced if damaged. The electrode sheet made of stainless steel material can be used as an electrode for electrical and thermal conductivity, which can protect the internal conductive adhesive film layer from damage and increase the service life of the heating core.

[0045] In the embodiment of the present invention, a sheet-shaped electrode sheet is used as an electrode, so that the current can be evenly distributed on the electrode, vertically passing through any point in the heating film layer 23 that needs to be heated and generating heat. At the same time, the advantages of screen printing such as large processing area and good uniformity can be used to reduce the preparation cost and simplify the preparation process.

[0046] like Figure 2 and Figure 3 As shown, a circuit 17 is manufactured on a substrate (such as a PI film) by printing silver paste, covering copper wire, etc., and different numbers of heating cores 13 are placed according to the heating requirements of each different heating area 15 to form a heating core array to provide heat for each individual heating area 15. Different heating areas 15 can be distributed on a large area of ​​substrate to form a complete battery pack heating film product.

[0047] The substrate can protect the internal heating core 13, and can also be directly adhered to the inside of the battery pack using a thermosetting adhesive on the outside of the substrate.

[0048] In an optional embodiment of the present invention, the areas of the heating film layers 23 in at least two of the heating cores 13 are different; and / or the thicknesses of the heating film layers 23 in at least two of the heating cores 13 are different.

[0049] Specifically, according to the resistance law in the embodiment of the present invention, the resistance value of the resistor is proportional to the length of the resistor and inversely proportional to the cross-sectional area of ​​the resistor. In the embodiment of the present invention, the length of the current passing through the resistor is equivalent to the thickness of the heating film layer 23, and the cross-sectional area of ​​the resistor is equivalent to the area of ​​the heating film layer 23. Therefore, the area and thickness of the heating film layer 23 can be flexibly designed to realize a heating core with different heating powers.

[0050] In an optional embodiment of the present invention, Figure 4 As shown, in order to avoid bending during use, the edges or corners of the heating core 13 are scratched and punctured, so the heating core 13 can be designed to be cylindrical. At the same time, the cylindrical heating core 13 can evenly transfer heat in all directions, and the overall heating effect of the battery pack heating film will be more uniform.

[0051] Optionally, the thickness range of the first electrode sheet 21 is 45 microns-55 microns, preferably 50 microns; the thickness range of the second electrode sheet 22 is 45 microns-55 microns, preferably 50 microns; the thickness range of the heating film layer 23 is 90 microns-110 microns, preferably 100 microns, to prevent the upper and lower electrode sheets from short-circuiting at the edges when cutting during the manufacture of the heating core.

[0052] In an optional embodiment of the present invention, Figure 3 As shown, a limiting component 16 is disposed on the first substrate 11 and / or the second substrate 12 .

[0053] The heating core 13 is installed in the limiting assembly 16 .

[0054] like Figure 1 As shown, the battery pack heating film also includes: a packaging component 14.

[0055] The packaging component 14 is used to perform edge sealing processing on the first substrate 11 and the second substrate 12 , and a vacuum state is formed between the first substrate 11 and the second substrate 12 .

[0056] Specifically, in the embodiment of the present invention, a limiting component 16 is provided on the second substrate 12 as an example for explanation. In order to avoid displacement of the heating core 13 between the first substrate 11 and the second substrate 12, which may cause the heating core 13 to be short-circuited, unevenly heated locally, and insufficient overall heat generation, after the circuit 17 is processed on the first substrate 11 and the second substrate 12, a layer of insulating material is printed on the second substrate 12 to process a limiting component 16 for the heating core 13 (taking the cylindrical heating core 13 as an example, the limiting component 16 may be a limiting ring), and the heating core 13 will be fixed in the limiting component 16. The printing height of the limiting component 16 is consistent with the thickness of the heating core, and the specific pattern can be determined according to actual conditions, which is not limited in the embodiment of the present invention.

[0057] After the heating core 13 and the second substrate 12 are assembled, the upper first substrate 11 is covered, the first substrate 11 and the second substrate 12 are edge-sealed based on the packaging component 14, and the area between the two is evacuated. The atmospheric pressure under the vacuum state can ensure close contact between the heating core 13 and the circuit 17. With this method, even if a certain area of ​​the battery pack heating film fails, it can be quickly disassembled for repair, and only the failed heating core needs to be replaced.

[0058] It should be noted that in the selection of processing materials, the base material wrapping the heating core 13 is required to be insulated and heat-resistant, with certain flexibility and ductility, so PI film is selected as the substrate in the embodiment of the present invention. Since stainless steel has good mechanical strength, corrosion resistance, and high temperature resistance, stainless steel is selected as the electrode sheet of the heating core 13 in the embodiment of the present invention. And based on the heating requirements of the battery pack heating film, the heating film layer 23 needs to have a certain heat resistance, so a conductive adhesive film layer or a carbon film layer is selected as the heating film layer 23 in the embodiment of the present invention.

[0059] refer to Figure 5 , Figure 5 A schematic diagram of the arrangement of a heat generating chip array provided by an embodiment of the present invention, referring to Figure 6 , Figure 6 Another arrangement diagram of a heat generating chip array provided by an embodiment of the present invention is shown in FIG. Figure 7 , Figure 7 A schematic diagram of the arrangement of another heating core array provided in an embodiment of the present invention.

[0060] The heating film layer 23 in the heating core 13 can be made by spraying, transfer printing or other processes. The electrode sheet can be made of materials other than stainless steel, and the substrate can be made of flexible materials other than PI film. The design of the heating core 13 pattern can be cylindrical (such as Figure 5 As shown), you can also use a linear (such as Figure 6 As shown), broken line (as shown Figure 7 As shown in the figure, other solutions such as those shown in the figure only need to ensure uniform area distribution within the same power partition.

[0061] The following is a brief description of the design logic of this application.

[0062] The overall design and calculation method in a single heating area are as follows:

[0063]

[0064] Among them, U is the input rated voltage. Since the circuit in this design is a pure parallel structure, the voltage is equal everywhere. W is the power requirement in the heating area. R is the total heating resistance value in this heating area, and the resistance requirement of each heating area can be calculated based on this.

[0065]

[0066] According to the law of resistance, the resistance of a resistor is proportional to the resistivity and the length of the resistor, and inversely proportional to the cross-sectional area of ​​the resistor. R is the total heating resistor value in the heating area obtained in the previous step, S is the estimated heating area of ​​the heating area, and T is the thickness of the heating film layer. The resistivity requirement of the heating film layer printed in the heating area can be obtained.

[0067]

[0068] Select the nearest integer value for the resistivity requirement calculated in the previous step, verify each different heating area, calculate the heating area requirement corresponding to the resistivity in each heating area, and verify whether the maximum area of ​​the heating area can be met. Among them, ρ2 is the new resistivity value selected nearby, T is the thickness of the heating film layer, and R is the total heating resistance value in this heating area. From this, the heating area requirement S2 corresponding to the resistivity can be obtained. By comparing the heating area requirement corresponding to the resistivity in each heating area with the maximum area of ​​each heating area, if the heating area in all areas can be met, the heating film layer of this resistivity meets the use requirements.

[0069] Finally, after the heating area calculation of all heating zones is completed, a corresponding number of heating cores are placed in each heating zone according to the numerical value of the heating area.

[0070] The following is further explained by way of specific embodiments:

[0071] refer to Figure 8 , Figure 8 A schematic diagram of heating requirement zoning for a battery pack provided in an embodiment of the present invention. Figure 8 The length and width of the middle area are given in millimeters.

[0072] Taking the heating requirement of a certain contact surface in the battery pack as an example, the contact surface is divided into 9 areas, and the specific values ​​are shown in Table 1:

[0073] Table 1

[0074] Area No. Length(m) Width(m) <![CDATA[Area (m 2 )]]> Power requirement (W) 1 0.07 0.087 0.0061 24.4 2 0.347 0.087 0.0302 84.5 3 0.07 0.087 0.0061 18.3 4 0.07 0.4685 0.0328 104.9 5 0.347 0.4685 0.1626 341.4 6 0.07 0.4685 0.0328 78.7 7 0.07 0.087 0.0061 24.4 8 0.347 0.087 0.0302 84.5 9 0.07 0.087 0.0061 18.3

[0075] Taking the central area (area numbered 5) as the reference, the total heating resistance R5 in the central area is calculated as follows:

[0076]

[0077] Assuming that the maximum area of ​​the central area is the printing area and the thickness of the heating film layer is 100 microns, the resistivity requirement of the heating film layer printed in the central area is calculated as follows:

[0078]

[0079] Adjust the resistivity to 1×10 6 Ω·m, bring it into each area for calculation, and obtain the new heating area requirement based on this resistivity and resistance requirement. The calculation results are shown in Table 2:

[0080] Table 2

[0081] Area No. <![CDATA[Area of the region (m 2 )]]> <![CDATA[Heating area requirement (m 2 )]]> 1 0.0061 0.0033 2 0.0302 0.0113 3 0.0061 0.0025 4 0.0328 0.0141 5 0.1626 0.0457 6 0.0328 0.0105 7 0.0061 0.0033 8 0.0302 0.0113 9 0.0061 0.0025

[0082] It can be seen from Table 2 that the area of ​​each region can meet the heating area requirement of this resistivity. The resistivity is selected as 1×10 6 The heating film layer of Ω·m is used to make the heating core. If the heating core is cut into a disc with a radius of 1cm, the area is 0.000314m 2 Taking the heating area with area number 1 as an example, the required heating area is 0.0033m 2 , then 10 heating cores can be arranged in this area to meet the heating needs of this area.

[0083] After completing the production and layout design of the heating core, it is encapsulated between two layers of PI film with printed circuits, and a complete heating film product can be obtained through vacuum packaging.

[0084] Based on the above embodiment of the present invention, a battery pack is further provided in another embodiment of the present invention, and the battery pack comprises: the battery pack heating film described in the above embodiment; the number of the battery pack heating films is N, N≥1, and N is a positive integer.

[0085] Based on the above embodiment of the present invention, another embodiment of the present invention further provides a vehicle, referring to Fig. 9 , Fig. 9A schematic diagram of a vehicle provided in an embodiment of the present invention. The vehicle 100 includes the battery pack described above.

[0086] The vehicle 100 includes but is not limited to an electric vehicle.

[0087] It can be seen from the above description that a battery pack heating film, a battery pack and a vehicle provided by an embodiment of the present invention have the following advantages:

[0088] Advantage 1: It can be customized for different application scenarios including but not limited to electric vehicle battery packs through a unified design concept. Different numbers of heating cores can be arranged in a heating area to meet different heating needs, and the heating effect is uniform.

[0089] Advantage 2: Since the heating film layer of the heating core has a large area, that is, the heating resistance area is large and the thickness is small, a very large amount of heat can be easily generated when the current passes vertically.

[0090] Advantage 3: It can directly transfer heat to the battery pack without causing damage to the battery itself.

[0091] Advantage 4: It is made of a composite of flexible organic film and metal material, occupies little space, can be rolled up, and is not easily damaged.

[0092] Advantage 5: Easy processing. The manufacturing process of the heating core is simple and can be cut as needed. The flat coating method such as screen printing is easy to operate, fast to process, and low in cost. It can produce a large number of products efficiently, which meets the current cost and production speed requirements of the electric vehicle market.

[0093] Advantage 6: The heating film layer is protected inside two layers of stainless steel electrode sheets and is difficult to be damaged and fail.

[0094] A battery pack heating film, a battery pack and a vehicle provided by the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

[0095] It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0096] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device that includes a series of elements is inherent to the elements, or also includes elements inherent to these processes, methods, articles or devices. In the absence of further restrictions, the elements defined by the sentence "including a..." do not exclude the presence of other identical elements in the process, method, article or device that includes the elements.

[0097] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack heating film, characterized in that: The battery pack heating film comprises: A first substrate and a second substrate are arranged opposite to each other in a first direction, wherein the first direction is perpendicular to a plane where the first substrate is located or perpendicular to a plane where the second substrate is located; A plurality of heat generating cores located between the first substrate and the second substrate; the heat generating cores include a first electrode sheet and a second electrode sheet arranged opposite to each other in the first direction, and a heat generating film layer located between the first electrode sheet and the second electrode sheet; The area between the first substrate and the second substrate is divided into a plurality of independent heating areas, and the number of heat generating cores placed in at least two of the heating areas is different.

2. The battery pack heating film according to claim 1, characterized in that: The areas of the heating film layers in at least two of the heating cores are different.

3. The battery pack heating film according to claim 1, characterized in that: The thickness of the heating film layer in at least two of the heating cores is different.

4. The battery pack heating film according to claim 1, characterized in that: A limiting component is disposed on the first substrate and / or the second substrate; The heating core is installed in the limiting assembly.

5. The battery pack heating film according to claim 1, characterized in that: The battery pack heating film further comprises: a packaging assembly; The packaging assembly is used to perform edge sealing processing on the first substrate and the second substrate, and a vacuum state is formed between the first substrate and the second substrate.

6. The battery pack heating film according to any one of claims 1 to 5, characterized in that: The heating film layer is a conductive adhesive film layer.

7. The battery pack heating film according to any one of claims 1 to 5, characterized in that: The first electrode sheet and the second electrode sheet are stainless steel electrode sheets.

8. The battery pack heating film according to any one of claims 1 to 5, characterized in that: The heating film layer is a carbon film layer.

9. A battery pack, characterized in that: The battery pack comprises: a battery pack heating film according to any one of claims 1 to 8; The number of the battery pack heating films is N, N≥1, and N is a positive integer.

10. A vehicle, characterized in that: The vehicle includes the battery pack as claimed in claim 9.

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