Battery cell heating film of power battery module

Abstract

The invention discloses a battery cell heating film of a power battery module, which mainly comprises epoxy plates assembled on the two side surfaces of a heating core and heat-conducting silica gel pads adhered to the outer sides of the epoxy plates, and the outer side surfaces of the heat-conducting silica gel pads are connected with current collecting pieces at the battery cell pole ends of the battery module; a waist-shaped hole and a pull rod hole are formed in the epoxy plate and are used for fixing the heating film between the battery modules on the two sides; the epoxy plates and the corresponding heat-conducting silica gel pads adopt profiling structures which are similar to the side surfaces of the battery modules in shape; a plurality of temperature sensors are also integrated on the heating film and are used for monitoring the core body temperature of the heating film in a working state; an integrated temperature sensing wire harness is led out from a probe of the temperature sensor, and an electric connecting wire harness electrically connected with the heating core is led out from the heating film. The battery has the characteristics of high low-temperature heating rate, good assembling performance, high battery cell temperature consistency and the like, can effectively improve the charging and discharging performance of the new energy automobile under the extremely low-temperature working condition, and meets the use requirements of the new energy automobile in a wide temperature range.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a power battery module core heating film. Background Art

[0002] With the global emphasis on environmental protection and sustainable development, the new energy vehicle (NEV) industry chain has continued to improve in recent years as a clean energy alternative to traditional fuel vehicles. In particular, continuous advancements in battery and charging technologies have significantly reduced single-charge times and increased driving range. However, the capacity retention of NEV batteries in extremely low-temperature operating conditions remains a pressing issue for the industry.

[0003] There's a close relationship between the charge and discharge performance of power batteries and temperature, making temperature a key factor affecting battery performance and lifespan. Studies have shown that power batteries maintain optimal performance between 25°C and 40°C. At high temperatures, chemical reactions within the battery intensify, resulting in overheating that accelerates battery aging. At low temperatures, the insertion, deinsertion, and transfer of lithium ions within the battery cell are inhibited, severely impacting the charge and discharge rates, leading to power loss and even lithium deposition, shortening the battery's lifespan.

[0004] Based on the charging and discharging requirements and safety considerations of power batteries at low temperatures, the current battery heating solutions in the industry mainly include heating film heating, liquid heating, and high-frequency pulse heating technologies. Considering the hardware cost and technical difficulty, heating film thermal management solutions are widely used in natural air cooling solutions and liquid cooling system integration solutions. For example, PI heating film (polyimide heating film) is installed on the side of the battery cell to increase the cell temperature by directly heating the cell casing, while silicone heating film is placed on the top and bottom of the cell, or integrated with other components. All of these solutions can achieve a temperature increase.

[0005] Under the premise of considering the reliability and safety of the heating film, the existing heating film technical solutions still have the risk of dry burning caused by failure of the heating film or poor assembly, and the risk of heating failure caused by failure of the heating film. For example, in some solutions of heating film thermal management, the solution of using PI heating film to fix it to the side (small side) of the square shell battery cell through double-sided tape has achieved a certain heating capacity for the battery cell. However, on the one hand, the contact area between the side of the battery cell and the heating film is small, and the constant power uniformly distributed heating wire resistance is difficult to ensure the temperature consistency of the power battery under a long heating path, and the overall heating efficiency is not high; on the other hand, this type of double-sided tape adhesive assembly solution has no other fixed pressing and limiting structures. With the repeated start and stop of the heating film component in low temperature environment and the high and low temperature cycle of the working temperature, the aging and failure of the double-sided tape may cause the PI heating film and the battery cell surface to separate, increasing the risk of dry burning of the heating film in the battery pack.

[0006] Another example is the cold plate structure with an integrated heating film proposed by the industry. This involves installing the heating film assembly in a film plate placed above the flow channel plate, and then integrating the heating film assembly with the stamped liquid cooling plate via an upper plate. This solution, on the one hand, faces the problem of poor insulation between the heating film and the liquid cooling plate due to heating film failure. On the other hand, this integrated solution adds the film plate and heating film structure during heat transfer in the liquid cooling channel, reducing the heat dissipation efficiency of the liquid cooling system. Furthermore, due to the different heat dissipation rates of the battery cells at different locations within the power battery pack, the heating process can lead to uneven temperature variations in the battery cells, affecting their long-term low-temperature service life. Summary of the Invention

[0007] In view of the above, the present invention aims to provide a power battery module cell heating film, mainly to solve the problem of uneven cell temperature caused by the thermal management solution of the heating film in a low temperature environment.

[0008] The technical solution adopted in the present invention is as follows:

[0009] The present invention provides a power battery module core heating film, comprising: epoxy plates assembled on both sides of a heating core, and a thermally conductive silicone pad adhered to the outer side of the epoxy plate, wherein the outer side of the thermally conductive silicone pad contacts the current collector at the end of the battery cell pole of the battery module;

[0010] A plurality of waist-shaped holes and tie rod holes are opened on the epoxy plate to fix the heating film between the battery modules on both sides;

[0011] The epoxy plate and the corresponding thermally conductive silicone pad both adopt a contoured structure similar to the side shape of the battery module;

[0012] The heating film is also integrated with several temperature sensors, and the probes of the temperature sensors are arranged on the side of the epoxy board bonded to the thermal conductive silicone pad. The temperature sensors are used to monitor the core temperature of the heating film in the working state;

[0013] The probe of the temperature sensor is connected to an integrated temperature sensor harness, and the heating film is also connected to an electrical connection harness that is electrically connected to the heating core.

[0014] In at least one possible implementation, the heating core is divided into several areas, and the power density of each area is set according to the temperature drop distribution law of the battery cells of the battery modules on both sides of the heating film.

[0015] In at least one possible implementation, the direction of the heating core is set at least according to the actual contact area of the thermally conductive silicone pad.

[0016] In at least one possible implementation manner, a glass fiber sleeve is arranged on the outside of the electrical connection harness and / or the integrated temperature sensor harness.

[0017] In at least one possible implementation, the heating film further includes a plurality of connectors, which are connected to the electrical connection harness and the integrated temperature sensor harness, and are used to physically connect the heating core and the integrated temperature sensor to the controller of the power battery.

[0018] In at least one possible implementation, the thermally conductive silicone pads on one side of the heating film are separated according to the number of corresponding battery module areas to avoid separation ribs on the battery module areas.

[0019] In at least one possible implementation manner, a plurality of avoidance holes are provided on the thermally conductive silicone pad for avoiding rivets on the current collecting sheet of the battery cell.

[0020] In at least one possible implementation, if the heating film in the power battery is a series structure, the number of probes of the temperature sensor is at least 1; if the heating film in the power battery is a parallel structure, the number of probes of the temperature sensor is not less than the number of parallel heating films.

[0021] Compared with the prior art, the main design concept of the present invention is that it includes epoxy plates assembled on both sides of the heating core, and thermally conductive silicone pads bonded to the outer side of the epoxy plates, the outer side of the thermally conductive silicone pads being in contact with the current collector at the end of the battery cell pole of the battery module; a number of waist-shaped holes and pull rod holes are provided on the epoxy plates to fix the heating film between the battery modules on both sides; the epoxy plates and the corresponding thermally conductive silicone pads both adopt a contoured structure similar to the shape of the battery module side; a number of temperature sensors are also integrated on the heating film, which are mainly used to monitor the core temperature of the heating film in the working state; in addition, the probe of the temperature sensor is connected to an integrated temperature sensor harness, and the heating film is also connected to an electrical connection harness that is electrically connected to the heating core. The present invention has the characteristics of high low-temperature heating rate, good assembly, and high consistency of battery cell temperature. It can effectively improve the charging and discharging performance of new energy vehicles under extreme low-temperature conditions and meet the use requirements of new energy vehicles under a wide temperature range. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0023] Figure 1 A schematic structural diagram of a power battery module core heating film provided by an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the assembly of a heating film provided in an embodiment of the present invention;

[0025] Figure 3A schematic diagram of the side surface of a battery module (heating film installation surface) that cooperates with a heating film provided in an embodiment of the present invention;

[0026] Figure 4 A schematic diagram of the power distribution area of the heating film provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0028] The present invention proposes an embodiment of a power battery module core heating film, specifically, as Figure 1 and Figure 2 As shown, it includes: epoxy plates assembled on both sides of the heating core (PI matrix can be selected), and thermally conductive silicone pads bonded to the outer side of the epoxy plates, and the outer side of the thermally conductive silicone pads are in contact with the current collecting pieces at the battery cell pole ends of the battery module; specifically, an etched PI heating core is assembled between the epoxy plates on both sides, the epoxy plates play an insulating role, and the side of the epoxy plate away from the PI heating core can be fixed to one side of the thermally conductive silicone pad by double-sided tape, while the other side of the thermally conductive silicone pad cooperates with the current collecting piece assembly of the battery module, and the heat of the heating core is transferred to the contacted battery cells for heating through the epoxy plates and the thermally conductive silicone pads.

[0029] In addition, a number of waist-shaped holes (not shown in the figure) and pull rod holes are provided on the epoxy plate, which are used to securely fix the heating film between the battery modules on both sides (module 1 and module 2 in the figure) through rivets and pull rods respectively. To elaborate, during assembly, the position of the heating film can be pre-fixed by plastic rivets to ensure that the thermally conductive silicone pad can completely cover the electric chip area of the battery module, and then the battery modules on both sides are tightened by the pull rod, so that the thermally conductive silicone pad can fit tightly on the current collector after being squeezed. For example, the thickness of the thermally conductive silicone pad can be selected to be 1.5 mm, so that it has a certain amount of compression, ensuring that the thermally conductive silicone pad can be completely fitted with the battery cell current collector after being compressed to avoid the risk of dry burning.

[0030] The epoxy plate and the corresponding thermal conductive silicone pad both adopt a contoured structure, that is, similar to the shape of the side of the battery module (such as Figure 3 Schematic diagram), so that the side of the battery module can be completely covered, and the PI heating core is also completely covered by the epoxy board.

[0031] Specifically, the contoured thermally conductive silicone pad can be cut to resemble the plastic section of the battery module. One side of the pad is perfectly aligned with the battery chip area, while the other side is attached to the epoxy board, completely covering the area where the PI heating core is located. Furthermore, in actual operation, the orientation and resistance of the PI heating core can be determined based on the temperature distribution of the module's cells and the expected temperature rise, as will be explained later. It should be noted that the diagram is for reference only; the length and shape of the heating film will vary depending on the side structure of the battery module. Similarly, the thickness of the thermally conductive silicone pad can also be adjusted based on changes in the overall module space.

[0032] Continuing from the previous article, several temperature sensors are also integrated on the heating film. The probes of the temperature sensors are arranged on the side of the epoxy board bonded to the thermal silicone pad. The temperature sensors are used to monitor the core temperature of the heating film in the working state. It can be added here that for the series structure, the probe of the integrated temperature sensor should be no less than 1; for the parallel structure, the probe of the integrated temperature sensor should not be less than the number of parallel heating films.

[0033] The probe of the temperature sensor leads to an integrated temperature sensor harness (integrated temperature sensing harness), and the heating film also leads to an electrical connection harness that is electrically connected to the PI heating core. In some preferred embodiments, a glass fiber sleeve is arranged on the outside of the electrical connection harness to play a protective role; in other preferred embodiments, the heating film also includes a plurality of connectors, which are connected to the electrical connection harness and the integrated temperature sensor harness for physically connecting the heating core and the integrated temperature sensor harness. It can be understood by those skilled in the art that the connector can be set to a quick-plug type or a fixed type, etc., and there is no specific restriction on this in this embodiment; and it can be supplemented with the above that in actual operation, an electrical connection outlet is formed on the heating core of the heating film, and the main harness and the integrated temperature sensing harness can be connected at the outlet by silicone crimping. As mentioned above, the harness can be configured with a glass fiber sleeve and multiple connectors, each of which can connect the heating core lead harness and the integrated temperature sensing harness to the main harness of the power battery and other control components.

[0034] For ease of understanding, the aforementioned heating film electrical connection scheme can be divided into a first wire group and a second wire group:

[0035] The first wiring group is the electrical connection wiring group for the heating film, which mainly includes a terminal block, a glass fiber sleeve, and a main wiring harness. The main wiring harness of the heating film can be electrically connected to the main wiring harness of the power battery pack through the terminal block; the glass fiber sleeve is assembled on the main wiring harness; the other end of the main wiring harness is connected to the heating core of the heating film;

[0036] The second wiring group is an integrated temperature sensor wiring group, which mainly includes a terminal block, a temperature sensor wiring harness, and a water dropper. The temperature sensor wiring harness can be connected to the controller through the terminal block. In addition, the water dropper is silicone-bonded to the outlet end of the heating element of the heating film, and the water dropper and temperature sensor wiring harness are insulated from the heating element and the main wiring harness.

[0037] Regarding the shape of the thermal conductive silicone pad mentioned above, the battery module area adopts a contoured structure. Specifically, for example, the front of the entire heating film ( Figure 1 The visible side shows that the thermal conductive silicone pads are separated according to the number of battery module sections, so as to avoid the separation ribs on the module sections; this concept can also explain that the thermal conductive silicone pads are provided with a number of avoidance holes for avoiding the rivets on the battery cell collector. Furthermore, it should be pointed out that the shape and position distribution of the epoxy plates on both sides and the thermal conductive silicone pads thereon can be different, such as Figure 1 On the back side of the heating film (not shown), the structure and distribution of the thermal conductive silicone pad need to be set in conjunction with the module area on the corresponding side.

[0038] Those skilled in the art will appreciate that the start and stop of the heating film is mainly implemented through devices such as heating contactors and heating fuses. For example, heating instructions are sent through LBC software for execution, and the working state of the heating film is controlled by the battery cell temperature. As for electronic control, it is not the focus of the present invention, but it can be mentioned that the real-time power of the heating film should be positively correlated with the overall voltage platform of the battery pack when electronic control is performed.

[0039] Through the above embodiments, the heating film is tightly fitted to the battery cell collector, so that the heating film can directly transfer heat to the battery cell pole end during low-temperature heating, and then the heat of the heating film can fully act on the battery cell that cooperates with the heating film, effectively improving the low-temperature characteristics of the power battery. Compared with the existing solution of directly integrating the heating film with the battery cell surface or cold plate, it can also effectively avoid the risks of deformation and tearing caused by the expansion of the battery cell or liquid cooling plate.

[0040] The following is an introduction to the design process of the heating film. The parameter design target of the heating film mainly refers to the difference between the current ambient temperature of the power battery and the lowest temperature at which the power battery can be allowed to operate normally. In this way, the design heating power or heating rate that the heating film should have is determined when the power battery reaches the starting temperature for charging after a specific time under the current environment.

[0041] It can be understood that the above parameter design targets are aimed at the temperature states of all battery cells in the power battery pack. The heating requirements for battery cells in different positions are different. Therefore, the parameter design targets can also be specifically divided into: heating film performance targets, environmental targets, total power of the heating film, resistance of the PI heating core, etc.

[0042] As for the steps of obtaining and calculating the parameters of the heating film, they can mainly include: obtaining the basic physical properties of the battery cell and setting the low-temperature heating performance target of the heating film; calculating the total power of the heating film according to the battery cell characteristics and the heating film performance target and environmental target, calculating the current and heating core resistance of the heating film, and confirming the rated voltage and other parameters of the heating film; and finally confirming the direction and power density of the heating core of the heating film according to the simulated temperature field distribution.

[0043] To elaborate, the parameters of the basic physical properties of the battery cells may mainly include: battery cell specific heat capacity, battery cell mass, the number of heating cells required for a single heating film, and the battery cell charging and discharging strategy; the parameters of the low-temperature heating performance target of the heating film mainly include: total power, power density, contact area, heating core resistance, and temperature rise rate; during design, the total power and total resistance of the heating film are calculated based on the above-mentioned basic physical property parameters of the battery cells and the requirements of the low-temperature heating performance target of the heating film. The power distribution of the heating film can be further corrected and determined according to the temperature drop rate of the battery cells at different positions in the battery module. Finally, the distribution of the heating core direction is determined based on the actual contact area of the thermal conductive silicone pad.

[0044] For ease of understanding, the following design process is used here to illustrate.

[0045] Step S1: define the heat requirement of the battery pack under low temperature conditions according to the charge and discharge rate and heat generation power of the battery cell, and determine the target performance of the heating film design.

[0046] The target performance of the heating film design is the additional heat that the battery cell needs to obtain from the outside world in a low-temperature environment, which is manifested as the temperature rise rate of the battery cell within a certain period of time; in a specific embodiment, in order to heat the battery cell, it is necessary to calculate the heating film parameters based on the various physical parameters of the battery cell and the expected temperature rise efficiency of the heating film.

[0047] Step S2: Obtain the basic parameters of the battery cell: specific heat capacity, battery cell mass, battery cell quantity, etc., and calculate the power of the heating film to meet the target performance.

[0048] The parameter design process can refer to the following example:

[0049] according to , calculate the total power required to reach the target temperature rise, that is, based on the specific heat capacity of the battery cell, the mass of the single battery cell, the number of heating cells required by the heating film, and the target temperature rise rate, calculate the total power required to heat the battery cell to the target temperature, where λ is the redundancy coefficient, which can generally be taken as an empirical value;

[0050] The calculation of the total power described in this step assumes that all heated cells are heated from the same ambient temperature to the same target temperature. Due to the different positions of the cells, the actual temperature rise rate of the cells and the degree to which they are affected by the external environment are different, resulting in significant differences in cell temperature. In this example, the calculation of the total power only serves as the output of the target power design for the heating film.

[0051] The design parameters of the heating film can be expressed as parameters that affect its working performance when designing the heating film, such as the total power of the heating film, the total resistance of the heating core, the contact area, etc.

[0052] Step S3: confirm the current and resistance of the heating core of the heating film according to the battery pack voltage platform, determine the power distribution of the corresponding area and distribute the direction of the heating core between the heating films;

[0053] Specifically, the current and total resistance of the PI heating core can be calculated based on the rated voltage of the power battery; the power density of the heating film can be obtained based on the actual contact area between the thermal pad and the battery core.

[0054] If the confirmed power is evenly distributed across the entire heating film, the large differences in the temperature rise and natural temperature drop rates of the cells at each location will lead to poor temperature consistency during the heating process, reducing the service life of the cells. Therefore, the power density is redistributed based on the cell position. Specifically, the difference between the actual heating performance of the heating film and the design expectations can be confirmed based on bench low-temperature heating tests, and the heating film power density can be redistributed.

[0055] Generally speaking, the temperature distribution of module cells is regular. Figure 4 Through experimental analysis, the module structure has the characteristics of fast heat dissipation on both sides (the temperature of the battery cells on both sides drops quickly), followed by the top and bottom, and the slowest heat dissipation in the middle. Therefore, in terms of design, the corresponding Figure 4 For example, the power density can be divided into different areas (6 areas in the figure). For example, the power density of the heating film can be increased in the corresponding areas on both sides of the module. In addition, the power distribution should also ensure that the maximum temperature of the battery cell is within the control range during the heating process, and the minimum temperature of the battery cell when the heating film is turned off meets the required charging temperature of the battery cell.

[0056] In addition, it can be pointed out that for the no-load dry-burning test of the heating film under average power distribution, the surface temperature of the heating film continuously decreases as it moves away from the center of the heating film.

[0057] Step S4: simulation and experimental verification;

[0058] The above parameters such as total power, total resistance, and power density are used as standard design parameters for the heating film. Based on the overall design of the heating film, a simulation test study of the heating film in the whole package is completed to preliminarily confirm whether the power distribution of the heating film is reasonable and whether the temperature distribution and temperature rise rate of the whole package meet the design goals.

[0059] Specifically, based on the determined heating film structure and the selection of PI heating core resistance, length, width, etc., and after relevant process operations, the heating film sample is prepared, and then the sample is assembled into a battery pack to form a power battery assembly for bench low-temperature heating test.

[0060] It should be noted that the heating film sample is only used as input for subsequent heating film design parameters to determine the temperature rise and temperature rise rate of battery cells with different power densities, the natural temperature drop rate of the battery cells, the heating film control strategy, etc.

[0061] Step S5: Correcting the design parameters of the heating film;

[0062] Specifically, the actual values of the heating film samples under different working conditions are obtained, such as low-temperature charge and discharge heating test, vibration performance test and dry burning test, etc., and the design parameters of the heating film are corrected to avoid large differences between the simulation data and the actual data of the heating film, thereby improving the accuracy, safety and reliability of the calculated heating film parameters.

[0063] Step S6: outputting the heating film design parameters.

[0064] Specifically, based on the simulation and the low-temperature heating test of the sample, the final design parameters of the heating film are output, thereby completing the design process of the heating film thermal management solution.

[0065] In summary, the main design concept of the present invention is that it includes epoxy plates assembled on both sides of the heating core, thermally conductive silicone pads bonded to the outer side of the epoxy plates, and the outer side of the thermally conductive silicone pads are in contact with the current collector at the end of the battery cell pole of the battery module; a number of waist-shaped holes and pull rod holes are opened on the epoxy plates to fix the heating film between the battery modules on both sides; the epoxy plates and the corresponding thermally conductive silicone pads both adopt a contoured structure similar to the side shape of the battery module; a number of temperature sensors are also integrated on the heating film, which are mainly used to monitor the core temperature of the heating film in the working state; in addition, the probe of the temperature sensor is connected to an integrated temperature sensor harness, and the heating film is also connected to an electrical connection harness that is electrically connected to the heating core. The present invention has the characteristics of high low-temperature heating rate, good assembly, and high consistency of battery cell temperature. It can effectively improve the charging and discharging performance of new energy vehicles under extreme low temperature conditions and meet the use requirements of new energy vehicles in a wide temperature range.

[0066] If the expressions expressing directions are mentioned in the embodiments of the present invention, they are relative concepts based on the embodiments. In addition, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can represent: a, b, c, a and b, a and c, b and c or a, b and c, where a, b, c can be single or multiple.

[0067] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred modes can be reasonably combined and matched into a variety of equivalent schemes by those skilled in the art without departing from or changing the design ideas and technical effects of the present invention; therefore, the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. A power battery module core heating film, characterized in that: include: Epoxy plates are assembled on both sides of the heating core, and thermally conductive silicone pads are bonded to the outer sides of the epoxy plates, wherein the outer sides of the thermally conductive silicone pads are in contact with the current collectors at the battery cell pole ends of the battery module; A plurality of waist-shaped holes and tie rod holes are opened on the epoxy plate to fix the heating film between the battery modules on both sides; The epoxy plate and the corresponding thermally conductive silicone pad both adopt a contoured structure similar to the side shape of the battery module; The heating film is also integrated with several temperature sensors, and the probes of the temperature sensors are arranged on the side of the epoxy board bonded to the thermal conductive silicone pad. The temperature sensors are used to monitor the core temperature of the heating film in the working state; The probe of the temperature sensor is connected to an integrated temperature sensor harness, and the heating film is also connected to an electrical connection harness that is electrically connected to the heating core.

2. The power battery module core heating film according to claim 1, characterized in that: The heating core is divided into several areas, and the power density of each area is set according to the temperature drop distribution law of the battery cells of the battery modules on both sides of the heating film.

3. The power battery module core heating film according to claim 1, characterized in that: The direction of the heating core is set at least according to the actual contact area of the thermally conductive silicone pad.

4. The power battery module core heating film according to claim 1, characterized in that: A glass fiber sleeve is arranged on the outside of the electrical connection harness and / or the integrated temperature sensor harness.

5. The power battery module core heating film according to claim 1, characterized in that: The heating film also includes a plurality of connectors, which are connected to the electrical connection harness and the integrated temperature sensor harness, and are used to physically connect the heating core and the integrated temperature sensor to the controller of the power battery.

6. The power battery module core heating film according to claim 1, characterized in that: The thermally conductive silicone pads on one side of the heating film are separated and arranged according to the number of corresponding battery module areas, so as to avoid the separation ribs on the battery module areas.

7. The power battery module core heating film according to claim 1, characterized in that: The thermally conductive silicone pad is provided with a plurality of avoidance holes for avoiding the rivets on the battery core current collector.

8. The power battery module core heating film according to any one of claims 1 to 7, characterized in that: If the heating films in the power battery are in a series structure, the number of probes of the temperature sensor is at least one; if the heating films in the power battery are in a parallel structure, the number of probes of the temperature sensor is not less than the number of parallel heating films.

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