Heating film structure, heating control circuit and related equipment

Abstract

The invention relates to the technical field of battery temperature control, in particular to a heating film structure, a heating control circuit and related device.The heating film structure (100) comprises a functional layer (101), the functional layer (101) comprises a heating area (110) and a temperature collecting area (120), the heating area (110) is configured to heat a power battery pack, and the temperature collecting area (120) is configured to collect temperature of the power battery pack; the temperature collection area (120) is configured to collect the temperature of the power battery pack. The temperature acquisition of the power battery pack and the heating of the power battery pack are realized based on the functional layer, and the space utilization rate of the power battery pack is optimized.

Description

Technical Field

[0001] The present application relates to the field of battery temperature control technology, and in particular to a heating film structure, a heating control circuit and related equipment. Background Art

[0002] With the advancement of science and technology and the rapid development of productivity, new energy vehicle technology has become increasingly mature and has gradually gained public recognition. It has become popular in people's daily lives, greatly facilitating people's lives. Among them, the power battery pack is the power source of new energy vehicles. The performance of the battery pack directly affects the range of new energy vehicles.

[0003] Lithium-ion batteries, with their high specific capacity, excellent charge-discharge performance, and long cycle life, offer superior overall performance compared to other battery types. This has led to their widespread use in automobiles, electronics, and energy storage. This has led to increasingly stringent requirements for battery safety and reliability. Temperature is a key factor affecting the safety and reliability of lithium-ion batteries. To ensure optimal performance, the battery temperature must be kept within a certain range.

[0004] However, the control of battery temperature requires the use of independent temperature sampling devices, and the setting of temperature sampling devices greatly reduces the space utilization of the power battery pack. Summary of the Invention

[0005] The embodiments of the present application provide a heating film structure, a heating control circuit and related equipment, which realize temperature acquisition and heating of a power battery pack based on a functional layer, thereby optimizing the space utilization of the power battery pack.

[0006] In order to achieve the above-mentioned purpose, in a first aspect, the present application provides a heating film structure (100) for use in a power battery pack, comprising: a functional layer (101), wherein the functional layer (101) comprises a heating zone (110) and a temperature sampling zone (120), wherein the heating zone (110) is configured to heat the power battery pack, and the temperature sampling zone (120) is configured to sample the temperature of the power battery pack.

[0007] In some embodiments, the heating zone (110) and the temperature collecting zone (120) are located in the same plane.

[0008] In some embodiments, the heating zone (110) and the temperature collection zone (120) are integrally formed to form the functional layer (101).

[0009] In some embodiments, the heating zone (110) and the temperature sampling zone (120) include semiconductor materials having positive temperature coefficient thermistor characteristics.

[0010] In some embodiments, there is a gap (130) between the heating area (110) and the temperature collection area (120).

[0011] In some embodiments, the heating film structure (100) further includes: an electrode layer (102), located on the surface of the functional layer (101) and electrically connected to the functional layer (101), for realizing electrode wiring of the heating area (110).

[0012] In some embodiments, the electrode layer (102) includes: a first electrode, electrically connected to the temperature sampling area (120), configured to output a temperature sampling signal of the temperature sampling area (120); and a second electrode, electrically connected to the heating area (110), configured to supply power to the heating area (110).

[0013] In some embodiments, the operating voltage of the first electrode is less than the operating voltage of the second electrode.

[0014] In some embodiments, the first electrode is a low voltage electrode, and the second electrode is a high voltage electrode.

[0015] In some embodiments, the electrode layer (102) is an integrally formed structure.

[0016] In some embodiments, the heating film structure (100) further includes: a first insulating layer (201), located on the surface of the functional layer (101) away from the electrode layer (102); and a second insulating layer (202), located on the surface of the electrode layer (102) away from the functional layer (101).

[0017] According to a second aspect of the present application, a heating control circuit (400) is provided, comprising a plurality of heating film structures (100) provided in the first aspect, and a control module (401) connected to each of the heating film structures (100); the control module (401) is configured to obtain a collection temperature corresponding to a temperature collection area (120) of the heating film structure (100), and in response to the collection temperature corresponding to the temperature collection area (120) of the target heating film structure being less than a first preset temperature, to supply power to the heating area (110) of the target heating film structure; wherein the target heating film structure is any one of the plurality of heating film structures (100).

[0018] In some embodiments, the plurality of heating film structures (100) are connected in parallel.

[0019] In some embodiments, the control module (401) includes: a temperature sampling unit (410), connected to the temperature sampling area (120) of each heating film structure (100), and the temperature sampling unit (410) is configured to provide a first control signal in response to the sampling temperature corresponding to the temperature sampling area (120) of the target heating film structure being greater than a first preset temperature; a battery management unit (420), connected to the temperature sampling unit (410), and the battery management unit (420) is configured to, in response to the first control signal, turn on a power supply circuit for supplying power to the heating area (110) of the heating film structure (100).

[0020] In some embodiments, the heating control circuit (400) further includes: a power supply (402), and a plurality of first contactors (403); wherein the first contactors (403) are arranged corresponding to the heating film structure (100) and are electrically connected to the battery management unit (420), and the power supply (402) is configured to supply power to the heating area (110) of each heating film structure (100).

[0021] In some embodiments, the first contactor (403), the heating area (110) of the heating film structure (100) corresponding to the first contactor (403), and the power supply (402) constitute the power supply circuit.

[0022] In some embodiments, the power supply circuit is a high voltage circuit.

[0023] In some embodiments, the positive pole of the power supply (402) is connected to the first end of the first contactor (403), the second end of the first contactor (403) is connected to the positive electrode of the heating zone (110), and the negative electrode of the heating zone (120) is connected to the negative pole of the power supply (402).

[0024] In some embodiments, the first contactor (403), the temperature sampling area (120) of the heating film structure (100) corresponding to the first contactor (403), and the control module (401) constitute a control loop.

[0025] In some embodiments, the control loop is a low voltage loop.

[0026] In some embodiments, the battery management unit (420) is connected to the first contactor (403), and the battery management unit (420) is configured to provide a conduction signal to close the first contactor (403) in response to the first control signal.

[0027] In some embodiments, the heating control circuit (400) further includes: a second contactor (404), which is arranged between the plurality of first contactors (403) and the power supply (402) and connected to the battery management unit (420), and the second contactor (404) is configured to conduct the power supply circuit in response to a power supply signal provided by the battery management unit (420).

[0028] In some embodiments, the control module (401) is further configured to, in response to the collection temperature corresponding to the temperature collection area (120) of the target heating film structure being greater than a second preset temperature, disconnect the power supply to the heating area (110) of the target heating film structure.

[0029] In some embodiments, the second preset temperature is greater than the first preset temperature.

[0030] A third aspect of the present application provides a power battery pack, comprising the heating film structure (100) provided in the first aspect, or comprising the heating control circuit (400) provided in the second aspect.

[0031] A fourth aspect of the present application provides a vehicle comprising the heating film structure (100) provided in the first aspect, or the heating control circuit (400) provided in the second aspect, or the power battery pack provided in the third aspect.

[0032] The heating film structure provided in the present application integrates the heating area and the temperature collection area through the functional layer, so that the functional layer has both heating function and temperature collection function, and integrates the heating function and the temperature collection function into the same component, thereby avoiding the need for independent temperature collection devices to control the battery temperature, removing redundant components, improving the space utilization of the power battery pack, and achieving lightweighting. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0034] Figure 1 A schematic structural diagram of a heating film structure provided in an embodiment of the present application;

[0035] Figure 2 A schematic structural diagram of a heating film structure with an electrode layer and an insulating layer provided in an embodiment of the present application;

[0036] Figure 3 A schematic diagram of the structure of the electrode layer provided in an embodiment of the present application;

[0037] Figure 4 A schematic diagram of the structure of a heating control circuit provided in an embodiment of the present application;

[0038] Figure 5 A schematic diagram of the specific structure of the heating control circuit provided in an embodiment of the present application;

[0039] Figure 6 This is a flow chart of the steps of the heating control method corresponding to the heating control circuit provided in the embodiment of the present application. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0041] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0042] In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is given to enable any person skilled in the art to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that one of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope of the principles and features claimed in the present application.

[0043] At the same time, this application uses specific terms to describe the embodiments of this application. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that "one embodiment," "an embodiment," or "an alternative embodiment" mentioned twice or multiple times in different locations in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application may be appropriately combined.

[0044] Similarly, it should be noted that, in order to simplify the description of this application and thus facilitate understanding of one or more embodiments of the application, the foregoing description of the embodiments of this application sometimes combines multiple features into a single embodiment, figure, or description thereof. However, this disclosure method does not mean that the subject matter of this application requires more features than those recited in the claims. In fact, the features of an embodiment may be fewer than all the features of the individual embodiments disclosed above.

[0045] In some embodiments, numbers are used to describe the quantity of components and attributes. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise stated, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the description and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should consider specifying significant digits and adopting the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the settings of such numerical values are as accurate as possible within the feasible range.

[0046] Each patent, patent application, patent application publication, and other materials, such as articles, books, specifications, publications, and documents, cited in this application is hereby incorporated by reference in its entirety, except for any application history that is inconsistent with or conflicts with this application, and any document (currently or subsequently appended to this application) that limits the broadest scope of the claims of this application. It should be noted that if the descriptions, definitions, and / or terminology used in the accompanying materials are inconsistent or conflicting with the examples in this application, the descriptions, definitions, and / or terminology used in this application will control.

[0047] Based on the background technology, it can be known that the control of battery temperature requires the use of an independent temperature sampling device, and the provision of the temperature sampling device greatly reduces the space utilization of the power battery pack.

[0048] This embodiment provides a heating film structure, which realizes temperature acquisition and heating of the power battery pack based on the functional layer, thereby optimizing the space utilization of the power battery pack.

[0049] refer to Figure 1 , Figure 1 This is a schematic diagram of the heating film structure provided in this embodiment. The heating film structure 100 provided in this embodiment, applied to a power battery pack, comprises a functional layer 101 including a heating zone 110 and a temperature sampling zone 120. The temperature sampling zone 120 is configured to sample the temperature of the power battery pack, while the heating zone 110 is configured to heat the power battery pack.

[0050] For the heating film structure 100 provided in this embodiment, the heating area 110 and the temperature collection area 120 are integrated through the functional layer 101, so that the functional layer 101 has both heating function and temperature collection function, and the heating function and the temperature collection function are integrated into the same component, thereby avoiding the need for independent temperature collection devices to control the battery temperature, removing redundant components, improving the space utilization of the power battery pack, and achieving lightweighting.

[0051] It should be noted that the functional layer mentioned in this embodiment can be a single-layer structure or a stacked structure.

[0052] In some embodiments, the functional layer 101 is a stacked multi-layer structure; for example, the functional layer 101 includes at least a stacked first functional layer and a second functional layer, wherein the first functional layer includes a heating area and the second functional layer includes a temperature collection area, so that the functional layer 101 has both heating function and temperature collection function.

[0053] In some embodiments, in the stacking direction of the functional layer 101 , the projections of the heat generating area and the temperature collecting area on the same plane do not overlap, so as to avoid functional crosstalk between the heat generating area and the temperature collecting area.

[0054] In some embodiments, the functional layer 101 is a single-layer structure. In this embodiment, the heating zone 110 and the temperature collection zone 120 are located on the same plane. Specifically, the heating zone 110 and the temperature collection zone 120 are arranged on the same plane, so that the heating zone 110 and the temperature collection zone 120 are located in the same area, thereby reducing the temperature deviation between the heating zone 110 and the temperature collection zone 120.

[0055] For example, if the heating membrane structure 100 is installed horizontally, the heating area 110 and the temperature collection area 120 are located in the same horizontal plane; in another example, if the heating membrane structure 100 is installed vertically, the heating area 110 and the temperature collection area 120 are located in the same vertical plane.

[0056] It should be noted that in Figure 1In this example, the temperature collection area 120 is located in the center of the heating area 110, which does not constitute a limitation of this embodiment. In specific applications, the location of the temperature collection area 120 can be flexibly adjusted to the temperature collection position of the power battery pack according to the heating film structure without being restricted by space.

[0057] In some embodiments, there is a gap (130) between the heating zone 110 and the temperature collection zone 120 to ensure that there is a certain distance between the heating zone 110 and the temperature collection zone 120 to avoid the heating of the heating zone 110 affecting the temperature collection of the temperature collection zone 120, that is, based on the gap, functional crosstalk is avoided between the heating zone 110 and the temperature collection zone 120.

[0058] In some embodiments, the heating zone 110 and the temperature collection zone 120 are integrally formed to form the functional layer 101. Specifically, the heating zone 110 and the temperature collection zone 120 are formed at one time, and no additional process or coupling application assembly is required, so as to reduce additional process procedures, simplify the production process of the heating film structure 100, and improve the sample generation efficiency and product yield.

[0059] In some embodiments, the heating zone 110 and the temperature sampling zone 120 include semiconductor materials with positive temperature coefficient (PTC) thermistor characteristics. PTC thermistors are one of the most common temperature-sensitive components in semiconductors. Their resistance increases with increasing temperature. They are typically made of metal oxides or polycrystalline semiconductors and offer reliable performance and fast response, making them widely used in measurement, control, and protection applications.

[0060] Thermistors in temperature sampling zone 120 have reduced electrical conductivity due to their material structure and composition. At low temperatures, the electron state is unevenly distributed, resulting in low resistance. As temperature rises, the material's internal lattice structure is excited, forming new scattering centers. This restricts the free movement of electrons and gradually increases resistance. Peripheral circuitry can use the resistance of the material in temperature sampling zone 120 to determine the corresponding temperature.

[0061] For the thermistor in the heating area 110 , the heating area 110 and the temperature collecting area 120 are made of the same material so that the heating area 110 and the temperature collecting area 120 are integrally formed to form the functional layer 101 .

[0062] refer to Figure 2 , Figure 2 Schematic diagram of a heating film structure with an electrode layer and an insulating layer provided in this embodiment. In some embodiments, the heating film structure 100 further includes an electrode layer 102, which is located on the surface of the functional layer 101 and electrically connected to the functional layer 101. The electrode layer 102 is used to realize the electrode wiring of the heating area 110.

[0063] refer to Figure 3 , Figure 3 Schematic diagram of the electrode layer structure provided for this embodiment. In some embodiments, electrode layer 102 includes a first electrode and a second electrode, wherein the first electrode is electrically connected to temperature sampling zone 120 and is configured to output a temperature sampling signal from temperature sampling zone 120; the second electrode is electrically connected to heating zone 110 and the second motor is configured to power heating zone 110.

[0064] Specifically, the first electrode includes a first positive electrode 301 and a first negative electrode 302. The first positive electrode 301 and the first negative electrode 302 are electrically connected to the temperature sampling area 120 to output a temperature sampling signal of the temperature sampling area 120, thereby realizing the temperature sampling function. The second electrode includes a second positive electrode 310 and a second negative electrode 320. The second positive electrode 310 and the second negative electrode 320 are electrically connected to the heating area 110 to realize the heating function of the heating area 110.

[0065] In some embodiments, the operating voltage of the first electrode is lower than that of the second electrode. By setting different operating voltages for the heating zone 110 and the temperature collection zone 120, with the temperature collection zone having a lower operating voltage, the overall load of the heating membrane structure is reduced, saving power consumption.

[0066] In some embodiments, the first electrode is a low voltage electrode and the second electrode is a high voltage electrode.

[0067] In some embodiments, the low-voltage electrode refers to the first electrode whose operating voltage is lower than the first preset voltage, wherein the first preset voltage can be a human body safety voltage to ensure the safety of the control circuit; the high-voltage electrode refers to the second electrode whose operating voltage is higher than the second preset voltage, wherein the second preset voltage can be the grid voltage to ensure the heating efficiency of the heating circuit.

[0068] In combination with the above discussion, the first electrode (the first positive electrode 301 and the first negative electrode 302) leads out the low-voltage positive and negative poles, connects the low-voltage circuit, and controls the power supply of the temperature collection area 120; the second motor (the second positive electrode 310 and the second negative electrode 320) leads out the high-voltage positive and negative poles, connects the high-voltage circuit, and controls the power supply of the heating area 110.

[0069] Specifically, at low temperatures, the temperature sampling zone is connected to the communication via a low-voltage circuit, and temperature sampling is performed continuously. When the heating start-up temperature range is reached, the heating film relay is energized via the high-voltage circuit, and the heating zone starts working to heat the battery. When the battery temperature reaches the heating exit condition, the high-voltage circuit is disconnected, the heating zone stops working, and the heating exits. The temperature sampling zone is controlled by the low-voltage circuit throughout the entire working process, and the temperature sampling function is performed normally. In addition, the PTC material will adaptively adjust the heating power according to the battery temperature, thereby compensating for the battery temperature difference during operation. This adaptive adjustment function increases the material resistance and reduces the heating power under high temperature conditions, and has an automatic constant temperature function, which can improve the thermal safety performance of the entire package.

[0070] In some embodiments, electrode layer 102 is an integrally formed structure. Specifically, the voltage electrode circuit and high-voltage electrode circuit of electrode layer 102 are formed in a single process, and then the leads of the first and second electrodes are connected. For example, through circuit design, electrode layer 102 can be processed in a single process to achieve true three-way coupling of function, area, and process.

[0071] Continue to refer Figure 2 In some embodiments, the heating film structure 100 further includes a first insulating layer 201 and a second insulating layer 202. The first insulating layer 201 is located on the surface of the functional layer 101 away from the electrode layer 102; the second insulating layer 202 is located on the surface of the electrode layer 102 away from the functional layer 101. The first insulating layer 201 and the second insulating layer 202 compress and wrap the functional layer 101 and the electrode layer 102, forming a four-layer coupled structural component. This ensures the insulation performance of the heating film structure 100, thereby improving the safety of the heating film structure 100.

[0072] In summary, the heating film structure 100 provided in this embodiment is integrated with materials having PTC characteristics to simultaneously realize temperature sampling and low-temperature heating functions, while removing the original temperature sampling components. The temperature sampling area 120 and the heating area 110 are made of the same material. Both can be designed on the same horizontal plane and flexibly adjusted according to the location requirements of the measuring points. Moreover, they are processed and formed in one step, without the need for additional temperature sampling components, thus saving space for the entire package and achieving lightweighting. At the same time, the electrode layer 102 can also be processed and formed in a single step, and finally connected to the low-voltage and high-voltage circuits by leads. From design to process forming to final application, it is simple and convenient.

[0073] It should be noted that, in the absence of conflict, the features disclosed in the heating film structure 100 provided in the above embodiments can be randomly combined to obtain a new embodiment of the heating film structure 100 .

[0074] This embodiment further provides a heating control circuit 400 to achieve independent control of multiple heating film structures 100 and improve the thermal safety performance of the entire package.

[0075] refer to Figure 4 , Figure 4 Schematic diagram of the heating control circuit provided in this embodiment. In some embodiments, the heating control circuit 400 includes multiple heating film structures 100 and a control module 401 connected to each heating film structure 100. The control module 401 is configured to obtain a sampled temperature corresponding to a temperature sampling zone 120 of the heating film structure 100 and, in response to the sampled temperature corresponding to the temperature sampling zone 120 of the target heating film structure being less than a first preset temperature T0, to supply power to the heating zone 110 of the target heating film structure; wherein the target heating film structure is any one of the multiple heating film structures 100.

[0076] It should be noted that Figure 4 The fact that the number of the heating film structures 100 in the example is three does not constitute a limitation to this embodiment. In specific applications, the number of the heating film structures 100 can be set arbitrarily.

[0077] Specifically, different heating film structures 100 are arranged at different positions of the power battery pack to achieve separate heating of different positions of the power battery pack, so that the overall temperature of the power battery pack tends to be stable.

[0078] The following Figure 4 The provided heating control circuit 400 is specifically described, wherein the three heating film structures are heating film 1, heating film 2 and heating film 3 respectively.

[0079] In some embodiments, the control module 401 obtains the first collected temperature corresponding to the temperature collection area 120 of the heating film 1. When the first collected temperature is less than the first preset temperature, it indicates that the temperature of the power battery pack in the area where the heating film 1 is located is low and needs to be heated. At this time, the control module 401 supplies power to the heating area 110 of the heating film 1 to heat the heating film 1, thereby increasing the temperature of the power battery pack in the area where the heating film 1 is located; accordingly, the control module 401 obtains the first collected temperature corresponding to the temperature collection area 120 of the heating film 2. When the first collected temperature is less than the first preset temperature, it indicates that the power battery pack in the area where the heating film 2 is located is low. The battery pack temperature is low and needs to be heated. At this time, the control module 401 supplies power to the heating zone 110 of the heating film 2, causing the heating film 2 to heat up, thereby increasing the temperature of the power battery pack in the area where the heating film 2 is located. Accordingly, the control module 401 obtains the first collected temperature corresponding to the temperature collection zone 120 of the heating film 3. When the first collected temperature is lower than the first preset temperature, it indicates that the power battery pack temperature in the area where the heating film 3 is located is low and needs to be heated. At this time, the control module 401 supplies power to the heating zone 110 of the heating film 3, causing the heating film 3 to heat up, thereby increasing the temperature of the power battery pack in the area where the heating film 3 is located. The control module 401 controls the heating films 1, 2, and 3 separately, so that the temperatures in the areas where the heating films 1, 2, and 3 are located are all higher than the first preset temperature, thereby ensuring that the overall temperature of the power battery pack is higher than the first preset temperature.

[0080] In some embodiments, multiple heating film structures 100 are connected in parallel. Specifically, if multiple heating films are controlled in parallel, a specific heating film can be activated based on the temperature feedback from the temperature sampling zone 120, achieving directional heating, reducing the temperature difference across the pack and overall heating losses, thereby achieving lightweighting, improving the safety of the power battery pack, reducing battery temperature differences, and improving low-temperature heating effects.

[0081] refer to Figure 5 , Figure 5 This is a schematic diagram of the specific structure of the heating control circuit provided in this embodiment.

[0082] In some embodiments, the control module 401 includes a temperature sampling unit 410 and a battery management unit 420. The temperature sampling unit 410 is connected to the temperature sampling zone 120 of each heating membrane structure 100 and is configured to provide a first control signal in response to the collected temperature corresponding to the temperature sampling zone 120 of the target heating membrane structure being greater than a first preset temperature. The battery management unit 420 is connected to the temperature sampling unit 410 and is configured to, in response to the first control signal, conduct a power supply circuit for powering the heating zone 110 of the heating membrane structure 100.

[0083] In some embodiments, the heating control circuit 400 also includes a power supply 402 and multiple first contactors 403; wherein the first contactor 403 is arranged corresponding to the heating film structure 100 and is electrically connected to the battery management unit 420, and the power supply 402 is configured to supply power to the heating area 110 of each heating film structure 100.

[0084] In some embodiments, the first contactor 403 , the heating area 110 of the heating film structure 100 corresponding to the first contactor 403 , and the power supply 402 constitute a power supply circuit.

[0085] Specifically, the positive electrode of the power supply 402 is connected to the first end of the first contactor 403, the second end of the first contactor 403 is connected to the positive electrode of the heating area 110, and the negative electrode of the heating area 110 is connected to the negative electrode of the power supply 402. Figure 3 The positive electrode of the heating area 110 is the second positive electrode 310 , and the negative electrode of the heating area 110 is the second negative electrode 320 .

[0086] In some embodiments, the power supply circuit is a high voltage circuit. Specifically, the high voltage circuit refers to a power supply circuit whose operating voltage is higher than a second preset voltage, wherein the second preset voltage may be a grid voltage to ensure the heating efficiency of the heating circuit.

[0087] refer to Figure 5For example, for heating film 1, the positive electrode of the heating area 110 of heating film 1 is connected to the first end of the corresponding first contactor 403 of heating film 1, the second end of first contactor 403 is connected to the positive electrode of power supply 402, and the negative electrode of power supply 402 is connected to the negative electrode of the heating area 110 of heating film 1. When first contactor 403 is turned on, the conductive path between heating film 1 and power supply 402 is in contact, and power supply 402 supplies power to the heating area 110 of heating film 1, heating film 1. For heating film 2, the positive electrode of the heating area 110 of heating film 2 is connected to the first end of the corresponding first contactor 403 of heating film 2, the second end of first contactor 403 is connected to the positive electrode of power supply 402, and the negative electrode of power supply 402 is connected to the negative electrode of the heating area 110 of heating film 2. When first contactor 403 is turned on, the conductive path between heating film 2 and power supply 402 is in contact, and power supply 402 supplies power to the heating area 110 of heating film 2, heating film 2. For heating film 3, the positive electrode of heating zone 110 of heating film 3 is connected to the first end of the first contactor 403 corresponding to heating film 3. The second end of first contactor 403 is connected to the positive electrode of power supply 402, and the negative electrode of power supply 402 is connected to the negative electrode of heating zone 110 of heating film 3. When first contactor 403 is turned on, the conductive path between heating film 3 and power supply 402 contacts, and power supply 402 supplies power to heating zone 110 of heating film 3, heating film 3. Among them, heating films 1, 2, and 3 are connected in parallel and do not affect each other, thus achieving precise control of heating in abnormal temperature areas of the power battery pack.

[0088] In some embodiments, the first contactor 403, the temperature sampling zone 120 of the heating membrane structure 100 corresponding to the first contactor 403, and the control module 401 constitute a control circuit to enable the battery management unit 420 to remotely control the power supply circuit of the corresponding heating membrane structure 100 based on the conduction signal. Based on the foregoing, it can be seen that the power supply circuit is a high-voltage circuit, and the safety of the heating control circuit 400 is guaranteed by remote operation of the power supply circuit.

[0089] In some embodiments, the battery management unit 420 is connected to the first contactor 403 , and the battery management unit 420 is configured to provide a conduction signal to close the first contactor in response to the first control signal.

[0090] Specifically, the collected temperature corresponding to the temperature collection area 120 of the heating membrane structure 100 is lower than the first preset temperature, indicating that the temperature of the current area of the power battery pack where the heating membrane structure 100 is located is too low. At this time, the temperature sampling unit provides a first control signal, and the battery management unit 420 controls the corresponding first contactor 403 to close based on the first control signal. At this time, the power supply circuit is turned on, and the power supply 402 supplies power to the heating area 110 of the heating membrane structure 100, and the heating membrane structure 100 starts to heat.

[0091] It should be noted that the corresponding Figure 5 The first contactor 403 in the example may be configured based on any one of a switch, a transistor, or a relay.

[0092] In some embodiments, the control circuit is a low-voltage circuit. Specifically, the low-voltage circuit refers to a control circuit whose operating voltage is lower than a first preset voltage, wherein the first preset voltage may be a human body safety voltage to ensure the safety of the control circuit.

[0093] In some embodiments, the heating control circuit 400 further includes a second contactor 404, which is disposed between the plurality of first contactors 403 and the power supply 402 and is connected to the battery management unit 420. The second contactor 404 is configured to conduct the power supply circuit in response to a power supply signal provided by the battery management unit 420. The second contactor 404 serves as the master control of the power supply circuit to further improve control of the power supply circuit.

[0094] In some embodiments, the positive pole of the power supply 402 is connected to the first end of the second contactor 404, the second end of the second contactor 404 is connected to the second end of the first contactor 403, the first section of the first contactor 403 is connected to the positive electrode of the heating membrane structure 100, and the negative electrode of the heating membrane structure 100 is connected to the negative pole of the power supply 402.

[0095] It should be noted that the corresponding Figure 5 The second contactor 404 in the example may be configured based on any one of a switch, a transistor, or a relay.

[0096] In some embodiments, the control module 401 is further configured to disconnect power to the heating area 110 of the target heating film structure in response to the collected temperature corresponding to the temperature collection area 120 of the target heating film structure being greater than a second preset temperature.

[0097] Specifically, if the collected temperature corresponding to the temperature sampling zone 120 of the heating membrane structure 100 is greater than the second preset temperature, it indicates that the temperature in the current area of the power battery pack where the heating membrane structure 100 is located is too high. At this time, the temperature sampling unit provides a corresponding signal to control the battery management unit 420 to disconnect the first contactor 403, thus closing the power circuit and stopping the heating membrane structure 100. By controlling the power supply zone 110 of the heating membrane structure 100 to be de-energized by the control module 401, the temperature in the current area of the power battery pack where the heating membrane structure 100 is located will not be too high, and the temperature of the power battery pack will remain within the preset range.

[0098] It should be noted that the power-off control principle of the heating zone 110 of the heating membrane structure 100 is the same as the power-on control principle of the heating zone 110 of the heating membrane structure 100 , and will not be described in detail in this embodiment.

[0099] In some embodiments, the second preset temperature is greater than the first preset temperature to ensure that the control module 401 correctly executes the power-on control and power-off control logic of the heating film structure 100 .

[0100] refer to Figure 5 and combined Figure 6 , Figure 6 This is a flow chart of each step of the heating control method corresponding to the heating control circuit provided in this embodiment.

[0101] The temperature sampling zone 120 corresponding to heating film 1 is temperature collection point 1, the temperature sampling zone 120 corresponding to heating film 2 is temperature collection point 2, and the temperature sampling zone 120 corresponding to heating film 3 is temperature collection point 3. When the second contactor 404 is closed, the battery management unit 420 provides overall control of the power supply circuits corresponding to heating films 1, 2, and 3.

[0102] For the heating film 1, the collection temperature T1 of the temperature collection area 120 corresponding to the heating film 1 is obtained based on the temperature collection point 1; it is judged whether T1 is less than the first preset temperature T0. When T1 is greater than the first preset temperature T0, it indicates that the temperature of the current area of the power battery pack where the heating film 1 is located is within the normal range. When T1 is less than the first preset temperature T0, it indicates that the temperature of the current area of the power battery pack where the heating film 1 is located is too low and needs to be heated; at this time, the first contactor 403 corresponding to the heating film 1 is closed, the power supply circuit of the heating area 110 corresponding to the heating film 1 is turned on, and the heating film 1 starts to heat; during the heating process of the heating film 1, the temperature collection point 1 is kept Continue to obtain the collected temperature T1. When the collected temperature T1 is not greater than the second preset temperature T4, the heating film 1 continues to heat. When the collected temperature T1 is greater than the second preset temperature T4, it indicates that the temperature of the current area of the power battery pack where the heating film 1 is located is too high and heating needs to be stopped. At this time, the first contactor 403 corresponding to the heating film 1 is disconnected, and the power supply circuit of the heating area 110 corresponding to the heating film 1 is disconnected, and the heating film 1 exits the heating process. It should be noted that after the heating film 1 is connected to the circuit, the state of the heating film 1 needs to be determined after each temperature determination process to prevent the state of the heating film 1 from being inconsistent with the state of the heating film required by the current temperature, thereby causing safety problems.

[0103] For the heating film 2, the collection temperature T2 of the temperature collection area 120 corresponding to the heating film 2 is obtained based on the temperature collection point 2; it is judged whether T2 is less than the first preset temperature T0. When T2 is greater than the first preset temperature T0, it indicates that the temperature of the current area of the power battery pack where the heating film 2 is located is within the normal range. When T2 is less than the first preset temperature T0, it indicates that the temperature of the current area of the power battery pack where the heating film 2 is located is too low and needs to be heated; at this time, the first contactor 403 corresponding to the heating film 2 is closed, the power supply circuit of the heating area 110 corresponding to the heating film 2 is turned on, and the heating film 2 starts to heat; during the heating process of the heating film 2, the temperature collection point 2 is kept Continue to obtain the collected temperature T2. When the collected temperature T2 is not greater than the second preset temperature T4, the heating film 2 continues to heat. When the collected temperature T2 is greater than the second preset temperature T4, it indicates that the temperature of the current area of the power battery pack where the heating film 2 is located is too high and heating needs to be stopped. At this time, the first contactor 403 corresponding to the heating film 2 is disconnected, and the power supply circuit of the heating area 110 corresponding to the heating film 2 is disconnected, and the heating film 2 exits the heating process. It should be noted that after the heating film 2 is connected to the circuit, the state of the heating film 2 needs to be determined after each temperature determination process to prevent the state of the heating film 2 from being inconsistent with the state of the heating film required by the current temperature, thereby causing safety problems.

[0104] For the heating film 3, the collection temperature T3 of the temperature collection area 120 corresponding to the heating film 3 is obtained based on the temperature collection point 3; it is judged whether T3 is less than the first preset temperature T0. When T3 is greater than the first preset temperature T0, it indicates that the temperature of the current area of the power battery pack where the heating film 3 is located is within the normal range. When T3 is less than the first preset temperature T0, it indicates that the temperature of the current area of the power battery pack where the heating film 3 is located is too low and needs to be heated; at this time, the first contactor 403 corresponding to the heating film 3 is closed, the power supply circuit of the heating area 110 corresponding to the heating film 3 is turned on, and the heating film 3 starts to heat; during the heating process of the heating film 3, the temperature collection point 3 is kept Continue to obtain the collected temperature T3. When the collected temperature T3 is not greater than the second preset temperature T4, the heating film 3 continues to heat. When the collected temperature T3 is greater than the second preset temperature T4, it indicates that the temperature of the current area of the power battery pack where the heating film 3 is located is too high and heating needs to be stopped. At this time, the first contactor 403 corresponding to the heating film 3 is disconnected, and the power supply circuit of the heating area 110 corresponding to the heating film 3 is disconnected, and the heating film 3 exits the heating process. It should be noted that after the heating film 3 is connected to the circuit, the state of the heating film 3 needs to be determined after each temperature determination process to prevent the state of the heating film 3 from being inconsistent with the state of the heating film required by the current temperature, thereby causing safety problems.

[0105] Figure 5This example shows three heaters connected in parallel. Relay switches are configured in the high-voltage power supply circuit, and a main contactor switch is used in the main circuit. The low-voltage control circuit is connected to a temperature sampling unit 410 for temperature acquisition. The sampled data is processed by a battery management unit 420, which then controls the high-voltage circuit heater switches based on strategic decisions, enabling targeted heating.

[0106] It should be noted that Figure 5 In the heating control circuit shown, the number of parallel heating films can be adjusted according to control requirements.

[0107] In addition, when the low-voltage control circuit is connected, temperature is collected in each temperature sampling zone. After the high-voltage power supply circuit is connected, the main contactor is energized. If T1, T2, T3>T0, the relays corresponding to each heating film in the high-voltage power supply circuit are turned on, and the heating function is turned on. If T1, T2, T3>T4, the relays corresponding to each heating film in the high-voltage power supply circuit are simultaneously disconnected, the main contactor is disconnected, and heating ends. If T1, T2>T4, T3<T4, only heating film 3 is turned on, and heating films 1 and 2 disconnect the contactors, stopping heating. And so on, the membrane heating function can be realized for any single circuit or two or three circuits.

[0108] It should be noted that Figure 6 In the control method shown, the first preset temperature T0 and the second preset temperature T4 are variable values, which can be specified in a specific design.

[0109] It should be noted that, in the absence of conflict, the features disclosed in the heating control circuit 400 provided in the above embodiments can be randomly combined to obtain a new embodiment of the heating control circuit 400.

[0110] Another embodiment of the present application further provides a power battery pack, including the heating film structure provided by the above embodiment, or including the heating control circuit provided by the above embodiment.

[0111] Another embodiment of the present application further provides a vehicle, comprising the heating film structure provided in the above embodiment, or comprising the heating control circuit provided in the above embodiment, or comprising the power battery pack provided in the above embodiment.

[0112] The exclusive right of the vehicle has all the beneficial effects of the above-mentioned minimum protection subject matter, which will not be elaborated in this application. The vehicle can be a fuel vehicle, a plug-in hybrid vehicle or a new energy vehicle, etc., which is not specifically limited in this application.

[0113] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the detailed description of other embodiments above and will not be repeated here.

[0114] The basic concepts have been described above. It will be apparent to those skilled in the art that the detailed disclosure above is merely illustrative and does not limit the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and amendments to the present application. Such modifications, improvements, and amendments are suggested in the present application and remain within the spirit and scope of the exemplary embodiments of the present application.

[0115] The above is a detailed introduction to a heating film structure, a heating control circuit and related equipment provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A heating film structure (100), applied to a power battery pack, characterized in that: include: A functional layer (101) includes a heating area (110) and a temperature sampling area (120), wherein the heating area (110) is configured to heat the power battery pack, and the temperature sampling area (120) is configured to sample the temperature of the power battery pack.

2. The heating film structure (100) according to claim 1, characterized in that The heating area (110) and the temperature collecting area (120) are located on the same plane.

3. The heating film structure (100) according to claim 1, characterized in that The heating area (110) and the temperature collecting area (120) are integrally formed to form the functional layer (101).

4. The heating film structure (100) according to claim 1, characterized in that The heating area (110) and the temperature sampling area (120) include semiconductor materials having positive temperature coefficient thermistor characteristics.

5. The heating film structure (100) according to claim 1, characterized in that: There is a gap (130) between the heating area (110) and the temperature collecting area (120).

6. The heating film structure (100) according to any one of claims 1 to 5, characterized in that: Also includes: An electrode layer (102) is located on the surface of the functional layer (101) and is electrically connected to the functional layer (101), and is used to realize electrode wiring of the heating area (110).

7. The heating film structure (100) according to claim 6, characterized in that The electrode layer (102) comprises: a first electrode electrically connected to the temperature sampling area (120) and configured to output a temperature sampling signal of the temperature sampling area (120); The second electrode is electrically connected to the heating area (110) and is configured to supply power to the heating area (110).

8. The heating film structure (100) according to claim 7, characterized in that: An operating voltage of the first electrode is lower than an operating voltage of the second electrode.

9. The heating film structure (100) according to claim 8, characterized in that: The first electrode is a low-voltage electrode, and the second electrode is a high-voltage electrode.

10. The heating film structure (100) according to claim 6, characterized in that The electrode layer (102) is an integrally formed structure.

11. The heating film structure (100) according to claim 6, characterized in that: Also includes: a first insulating layer (201) located on a surface of the functional layer (101) away from the electrode layer (102); The second insulating layer (202) is located on the surface of the electrode layer (102) away from the functional layer (101).

12. A heating control circuit (400), characterized in that: include: A plurality of heating film structures (100) according to any one of claims 1 to 11, and a control module (401) connected to each of the heating film structures (100); The control module (401) is configured to obtain a collected temperature corresponding to a temperature collection area (120) of the heating film structure (100), and in response to the collected temperature corresponding to the temperature collection area (120) of the target heating film structure being less than a first preset temperature, supply power to the heating area (110) of the target heating film structure; Wherein, the target heating film structure is any one of the multiple heating film structures (100).

13. The heating control circuit (400) according to claim 12, characterized in that: The plurality of heating film structures (100) are connected in parallel.

14. The heating control circuit (400) according to claim 12, characterized in that: The control module (401) comprises: a temperature sampling unit (410) connected to the temperature sampling area (120) of each heating film structure (100), the temperature sampling unit (410) being configured to provide a first control signal in response to a sampling temperature corresponding to the temperature sampling area (120) of a target heating film structure being greater than a first preset temperature; A battery management unit (420) is connected to the temperature sampling unit (410), and the battery management unit (420) is configured to, in response to the first control signal, conduct a power supply circuit for supplying power to the heating area (110) of the heating film structure (100).

15. The heating control circuit (400) according to claim 14, characterized in that: Also includes: A power supply (402), and a plurality of first contactors (403); wherein the first contactors (403) are arranged corresponding to the heating film structures (100) and are electrically connected to the battery management unit (420); and the power supply (402) is configured to supply power to the heating areas (110) of each heating film structure (100).

16. The heating control circuit (400) according to claim 15, characterized in that: The first contactor (403), the heating area (110) of the heating film structure (100) corresponding to the first contactor (403), and the power supply (402) constitute the power supply circuit.

17. The heating control circuit (400) according to claim 16, characterized in that: The power supply circuit is a high voltage circuit.

18. The heating control circuit (400) according to claim 16, characterized in that: The positive electrode of the power supply (402) is connected to the first end of the first contactor (403), the second end of the first contactor (403) is connected to the positive electrode of the heating zone (110), and the negative electrode of the heating zone (120) is connected to the negative electrode of the power supply (402).

19. The heating control circuit (400) according to claim 16, characterized in that: The first contactor (403), the temperature sampling area (120) of the heating film structure (100) corresponding to the first contactor (403), and the control module (401) constitute a control loop.

20. The heating control circuit (400) according to claim 19, characterized in that: The control circuit is a low-voltage circuit.

21. The heating control circuit (400) according to claim 20, characterized in that: The battery management unit (420) is connected to the first contactor (403), and the battery management unit (420) is configured to provide a conduction signal to close the first contactor (403) in response to the first control signal.

22. The heating control circuit (400) according to claim 15, characterized in that: Also includes: A second contactor (404) is provided between the plurality of first contactors (403) and the power supply (402), and is connected to the battery management unit (420). The second contactor (404) is configured to conduct the power supply circuit in response to a power supply signal provided by the battery management unit (420).

23. The heating control circuit (400) according to claim 12, characterized in that: The control module (401) is further configured to, in response to a sampling temperature corresponding to the temperature sampling area (120) of the target heating film structure being greater than a second preset temperature, disconnect power supply to the heating area (110) of the target heating film structure.

24. The heating control circuit (400) according to claim 23, characterized in that: The second preset temperature is greater than the first preset temperature.

25. A power battery pack, characterized in that: The heating film structure (100) comprises the heating film structure (100) according to any one of claims 1 to 11, or the heating control circuit (400) according to any one of claims 12 to 24.

26. A means of transport, characterized in that: It comprises the heating film structure (100) according to any one of claims 1 to 11, or the heating control circuit (400) according to any one of claims 12 to 24, or the power battery pack according to claim 25.

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