Heating film control method and device, vehicle control unit and vehicle

Abstract

The invention relates to a heating film control method and device, a vehicle control unit and a vehicle. The method comprises the following steps: when a battery operation condition is a low-temperature operation condition, acquiring a direct-current bus voltage of a power supply end of a heating film; determining a target power parameter of the heating film based on the DC bus voltage and the resistance of the heating film; sending the target power parameter to a battery management system; the target power parameter is used for controlling the heating film to heat the contacted battery. By the adoption of the method, the calculated power distribution parameters of the heating film can be accurately matched with the actual power of the heating film, waste caused by excessive power distribution due to the fact that the maximum theoretical power of the heating film is directly used is avoided, and then the power utilization rate of a whole vehicle system is increased.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a heating film control method, device, vehicle controller, and vehicle. Background Technology

[0002] With the rapid development of power battery technology for new energy vehicles, the market demand for efficient and reliable battery thermal management systems is increasing. Traditional battery heating technologies (such as air heating and coolant heating) have significant limitations in terms of heating efficiency, uniformity, space occupation, and weight, especially in high-power and high-energy-density battery applications. Therefore, battery film heating technology has emerged, which, through direct contact between the heating film and the battery, can effectively improve heating performance and system reliability.

[0003] When using battery film heating technology to heat the battery, the heating film needs to be effectively controlled. The current heating film control method can be summarized as follows: the vehicle controller allocates power according to the maximum theoretical power of the heating film, obtains and sends the power allocation value to the Battery Management System (BMS). After receiving the power allocation value, the BMS determines whether the heating conditions are met. If the heating conditions are met, the heating film is activated to heat the battery.

[0004] However, due to the large difference between the actual power value and the maximum theoretical power value during the operation of the heating film, the power distribution is unreasonable, which can easily lead to the waste of power resources. Summary of the Invention

[0005] Therefore, it is necessary to provide a heating film control method, device, vehicle controller, and vehicle that can ensure reasonable power distribution and avoid waste of power resources, in order to address the above-mentioned technical problems.

[0006] In a first aspect, this application provides a heating film control method, applied to a vehicle controller, comprising:

[0007] Under the condition that the battery is operating at low temperature, obtain the DC bus voltage at the power supply terminal of the heating film;

[0008] The target power parameters of the heating film are determined based on the DC bus voltage and the resistance of the heating film.

[0009] The target power parameters are sent to the battery management system; the target power parameters are used to control the heating film to heat the battery in contact with it.

[0010] In one embodiment, determining the target power parameters of the heating film based on the DC bus voltage and the resistance of the heating film includes:

[0011] The initial power parameters of the heating film are determined based on the DC bus voltage and the resistance of the heating film.

[0012] Based on the voltage change parameters and voltage change rate of the heating film within a preset time period, the initial power parameters are corrected to obtain the target power parameters.

[0013] In one embodiment, the initial power parameters are corrected based on the voltage change parameters and voltage change rate of the heating film within a preset time period to obtain the target power parameters, including:

[0014] Determine the corresponding heating film power correction value based on the voltage change parameters and voltage change rate;

[0015] Based on the heating film power correction value, the initial power parameters are corrected to obtain the target power parameters.

[0016] In one embodiment, determining the initial power parameters of the heating film based on the DC bus voltage and the resistance of the heating film includes:

[0017] The operating current of the heating film is determined based on the DC bus voltage and the resistance of the heating film.

[0018] The initial power parameters are determined based on the DC bus voltage and operating current.

[0019] In one embodiment, the aforementioned low-temperature operating condition is an AC preheating condition. The acquisition of the DC bus voltage at the heating film power supply terminal, when the battery operating condition is a low-temperature operating condition, includes:

[0020] When the battery is operating under AC preheating conditions, the DC bus output voltage of the power supply system is obtained as the DC bus voltage of the heating film power supply terminal.

[0021] In one embodiment, the aforementioned low-temperature operating condition is a battery heating condition, and the acquisition of the DC bus voltage at the heating film power supply terminal when the battery operating condition is a low-temperature operating condition includes:

[0022] When the battery is operating under battery heating conditions, the voltage of the power battery pack at the DC bus of the power supply system is obtained as the DC bus voltage at the power supply end of the heating film.

[0023] In one embodiment, when the battery is operating under low-temperature conditions, before obtaining the DC bus voltage at the heating film power supply terminal, the method further includes:

[0024] Upon receiving a heating request from the battery management system, the battery's operating status is obtained.

[0025] Secondly, this application also provides a heating film control device, applied to a vehicle controller, comprising:

[0026] The acquisition module is used to acquire the DC bus voltage of the heating film power supply terminal when the battery is operating at low temperature.

[0027] The determination module is used to determine the target power parameters of the heating film based on the DC bus voltage and the resistance of the heating film;

[0028] The transmitting module is used to send the target power parameters to the battery management system; the target power parameters are used to control the heating film to heat the battery in contact with it.

[0029] Thirdly, this application also provides a vehicle controller, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0030] Under the condition that the battery is operating at low temperature, obtain the DC bus voltage at the power supply terminal of the heating film;

[0031] The target power parameters of the heating film are determined based on the DC bus voltage and the resistance of the heating film.

[0032] The target power parameters are sent to the battery management system; the target power parameters are used to control the heating film to heat the battery in contact with it.

[0033] Fourthly, this application also provides a vehicle including a vehicle controller as described in the third aspect.

[0034] The aforementioned heating film control method, device, vehicle controller, and vehicle, when the battery is operating in a low-temperature condition, calculate the power distribution parameters of the heating film based on the real-time voltage of the heating film. This ensures that the calculated power distribution parameters accurately match the actual power of the heating film, avoiding waste caused by over-allocation of power due to directly using the maximum theoretical power of the heating film, thereby improving the power utilization rate of the entire vehicle system. Furthermore, compared to the traditional technology of allocating power according to the maximum theoretical power of the heating film, this application significantly reduces the power distribution requirement of the heating film by calculating the target power parameters of the heating film in real time, making it easier for the vehicle to meet the working requirements of the heating film, thereby improving the stability of the heating film's operation. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is an application environment diagram of the heating film control method in one embodiment;

[0037] Figure 2 This is a flowchart illustrating a heating film control method in one embodiment;

[0038] Figure 3 This is a flowchart illustrating the heating film control method in another embodiment;

[0039] Figure 4 This is a flowchart illustrating the heating film control method in another embodiment;

[0040] Figure 5 This is a flowchart illustrating the heating film control method in another embodiment;

[0041] Figure 6 This is a flowchart illustrating the heating film control method in another embodiment;

[0042] Figure 7 This is a flowchart illustrating the heating film control method in another embodiment;

[0043] Figure 8 This is a structural block diagram of the heating film control device in one embodiment;

[0044] Figure 9 This is an internal structural diagram of the vehicle controller in one embodiment. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0046] With the rapid development of power battery technology for new energy vehicles, the market demand for efficient and reliable battery thermal management systems is increasing. Traditional battery heating technologies (such as air heating and coolant heating) have significant limitations in terms of heating efficiency, uniformity, space occupation, and weight, especially in high-power and high-energy-density battery applications. Therefore, battery film heating technology has emerged, which, through direct contact between the heating film and the battery, can effectively improve heating performance and system reliability.

[0047] When using battery film heating technology to heat the battery, the heating film needs to be effectively controlled. The current heating film control method can be summarized as follows: the vehicle controller allocates power according to the maximum theoretical power of the heating film, obtains and sends the power allocation value to the Battery Management System (BMS). After receiving the power allocation value, the BMS determines whether the heating conditions are met. If the heating conditions are met, the heating film is activated to heat the battery.

[0048] However, the large difference between the actual power value and the maximum theoretical power value during the operation of the heating film leads to unreasonable power allocation and waste of power resources. Therefore, this application provides a heating film control method to solve this problem.

[0049] The heating film control method provided in this application embodiment can be applied to, for example... Figure 1 In the vehicle controller 10 of the application environment shown, the application environment includes the vehicle controller 10, the battery management system 20, the heating film 30, and the battery 40. The battery management system (BMS) 20 is connected to the vehicle controller 10 and the heating film 30 respectively. The BMS can obtain the current cell temperature of the battery and send a heating request to the vehicle controller 10 when the current cell temperature is lower than a preset temperature threshold. After receiving the heating request sent by the BMS, the vehicle controller 10 can generate the power parameters of the heating film 30 and send the power parameters of the heating film 30 to the BMS. After receiving the power parameters of the heating film 30, the BMS determines whether the power parameters of the heating film 30 meet the heating conditions. If the conditions are met, the relay is closed and the heating film 30 is started to heat the battery 40.

[0050] In one exemplary embodiment, such as Figure 2 As shown, a heating film control method is provided, which is applied to... Figure 1 Taking the vehicle controller 10 as an example, the explanation includes:

[0051] S201. Under the condition that the battery is operating at low temperature, obtain the DC bus voltage of the heating film power supply terminal.

[0052] Low-temperature operating conditions refer to the conditions under which the battery operates at a preset temperature threshold. For example, when charging the battery of a new energy vehicle, if the battery temperature is below -30 degrees Celsius, the battery is considered to be in a low-temperature operating condition and needs to be preheated. The battery can only be charged normally when its temperature rises to a certain level. Another example is when a new energy vehicle is in operation or its battery is being charged. If the battery temperature is below a certain level, the battery is considered to be in a low-temperature operating condition.

[0053] The DC bus voltage at the power supply terminal of the heating film refers to the DC bus voltage at the port that supplies power to the heating film.

[0054] In this embodiment, the battery operating condition can be obtained first, and it can be determined whether the battery operating condition is a low temperature operating condition. If the battery operating condition is a low temperature operating condition, the DC bus voltage of the heating film power supply terminal can be obtained.

[0055] Optionally, low-temperature operating conditions can include AC preheating and battery heating conditions. Battery heating conditions include battery charging heating and driving battery heating. AC preheating refers to the condition where, before charging the battery of a new energy vehicle, if the battery temperature is below -30 degrees Celsius, the battery is considered to be in AC preheating mode and needs to be preheated until the battery temperature rises to a certain level before normal charging can begin. Battery charging heating refers to the condition where, during the charging process, the battery temperature is below the effective charging temperature. In this case, the battery also needs to be charged to bring the battery temperature to the effective charging temperature, thereby ensuring charging efficiency. Driving battery heating refers to the condition where, during driving, the battery temperature is below the effective driving temperature. In this case, the battery also needs to be charged to bring the battery temperature to the effective driving temperature, thereby ensuring the driving speed of the new energy vehicle.

[0056] It should be noted that the DC bus voltage at the heating film's power supply terminal differs under different types of low-temperature operating conditions. For example, in AC preheating mode, the output voltage of the DC-to-DC (DCDC) converter on the power supply system's DC bus can be used as the DC bus voltage at the heating film's power supply terminal. Similarly, in battery heating mode, the voltage of the power battery pack on the power supply system's DC bus can be used as the DC bus voltage at the heating film's power supply terminal.

[0057] S202. Based on the DC bus voltage and the resistance of the heating film, determine the target power parameters of the heating film.

[0058] In this embodiment, after obtaining the DC bus voltage of the heating film power supply terminal, the target power parameters of the heating film can be obtained by calculation based on the DC bus voltage and the resistance of the heating film.

[0059] In this embodiment, the control logic of the electric heating device first needs to obtain the actual voltage value of the DC bus in real time through a voltage sampling circuit, and then combine it with the resistance characteristics of the heating film under the current working environment (the influence of temperature on resistance needs to be considered, and its effective resistance value needs to be determined through calibration or real-time detection), and then based on the basic relationship between power, voltage, and resistance (P=U... 2 The target power parameters that the heating film should achieve under the current operating conditions are calculated by taking into account the heat demand, energy consumption limitations and safe operation thresholds of the heating film. This process needs to take into account both the voltage stability of the DC bus (to avoid excessive voltage fluctuations on the bus due to power changes) and the heat output efficiency of the heating film. The final target power must meet the heating requirements of the load and be compatible with the power supply capacity of the system and the long-term operational reliability of the equipment.

[0060] S203. Send the target power parameters to the battery management system; the target power parameters are used to control the heating of the battery in contact with the heating film.

[0061] In this embodiment, after obtaining the target power parameters, the target power parameters can be sent to the battery management system. After receiving the target power parameters, the battery management system can determine whether the target power parameters meet the heating conditions. If the target power parameters meet the heating conditions, the system controls the relay of the heating film to close, so as to start the heating film to heat the battery in contact with it.

[0062] In this embodiment, when the battery is operating at low temperatures, the power allocation parameters of the heating film are calculated based on the real-time voltage of the heating film. This ensures that the calculated power allocation parameters accurately match the actual power of the heating film, avoiding waste caused by over-allocation of power due to directly using the maximum theoretical power of the heating film, thereby improving the power utilization rate of the entire vehicle system. In addition, compared with the traditional technology of allocating power according to the maximum theoretical power of the heating film, this application significantly reduces the power allocation requirement of the heating film by calculating the target power parameters of the heating film in real time, making it easier for the vehicle to meet the working requirements of the heating film, thereby improving the stability of the heating film's operation.

[0063] In this embodiment, in the above Figure 2 Based on the illustrated embodiment, a detailed process for determining the target power parameters of the heating film based on the DC bus voltage and the resistance of the heating film will be explained. In an exemplary embodiment, such as Figure 3 As shown, the above S202 includes:

[0064] S301. Determine the initial power parameters of the heating film based on the DC bus voltage and the resistance of the heating film.

[0065] In this embodiment, after obtaining the DC bus voltage, the resistance of the heating film can be further obtained, and the initial power parameters of the heating film can be calculated based on the DC bus voltage and the resistance of the heating film.

[0066] Optionally, a method for determining the initial power parameters of the heating film based on the DC bus voltage and the resistance of the heating film is provided below. See [link to relevant documentation]. Figure 4 The aforementioned S301 includes:

[0067] S3011. Determine the operating current of the heating film based on the DC bus voltage and the resistance of the heating film.

[0068] In this embodiment, after obtaining the DC bus voltage and the resistance of the heating film, the ratio between the DC bus voltage and the resistance of the heating film can be determined as the operating current of the heating film.

[0069] Optionally, if the battery is operating under AC preheating conditions, the DC bus voltage at the power supply terminal of the heating film is the output voltage of the DC-DC converter. Based on the output voltage of the DC-DC converter and the resistance of the heating film, the operating current of the heating film can be determined.

[0070] Optionally, if the battery is operating in a battery heating mode, the DC bus voltage at the power supply terminal of the heating film is the power battery pack voltage, and the operating current of the heating film is determined based on the power battery pack voltage and the resistance of the heating film.

[0071] S3012. Determine the initial target power parameters based on the DC bus voltage and operating current.

[0072] In this embodiment, after obtaining the operating current of the heating film, the product between the DC bus voltage and the operating current can be determined as the target power parameter.

[0073] This provides a method for determining the initial power parameters of a heating film.

[0074] S302. Based on the voltage change parameters and voltage change rate of the heating film within a preset time period, the initial power parameters are corrected to obtain the target power parameters.

[0075] In this embodiment, after determining the initial power parameters, the voltage change parameters and voltage change rate of the heating film within a preset time period can also be obtained. Based on the voltage change parameters and voltage change rate of the heating film, the initial power parameters can be corrected to obtain the target power parameters.

[0076] Optionally, the following describes a detailed process for correcting the initial power parameters based on the voltage change parameters and voltage change rate of the heating film over a preset time period to obtain the target power parameters. (See [link to relevant documentation]). Figure 5The aforementioned S302 includes:

[0077] S3021. Determine the corresponding heating film power correction value based on the voltage change parameters and voltage change rate.

[0078] In this embodiment, after determining the initial power parameters, the voltage change parameters and voltage change rate of the heating film within a preset time period can be obtained. Based on the voltage change parameters and voltage change rate of the heating film, a preset correspondence table is queried to determine the corresponding heating film power correction value. The preset correspondence table refers to the correspondence between voltage change parameters, voltage change rate and power correction value.

[0079] For example, if the heating film drops from 300V to 260V within 5 seconds, then the voltage change parameter within these 5 seconds is -40V, and the voltage change rate is -8V / s. Based on the voltage change parameter -40V and the voltage change rate -8V / s, a preset correspondence table is consulted to determine the corresponding heating film power correction value.

[0080] S3022. Based on the heating film power correction value, correct the initial power parameters to obtain the target power parameters.

[0081] In this embodiment, after determining the heating film power correction value and the initial power parameter, the sum of the heating film power correction value and the initial power parameter can be determined as the target power parameter.

[0082] For example, if the heating film power correction value is 2W and the initial power parameter is 10W, then the determined target power parameter is the sum of the heating film power correction value of 2W and the initial power parameter of 10W, that is, the obtained target power parameter is 12W.

[0083] It should be noted that the initial power parameters are corrected based on the voltage change parameters and voltage change rate of the heating film within a preset time period. Then, through fuzzy control, the power distribution of the heating film is adjusted in advance according to the corrected target power parameters during the dynamic change of the battery voltage to ensure the stable operation of the heating film.

[0084] In addition, the actual power of the heating film is calculated based on the voltage across the heating film. Therefore, the power parameter correction scheme mentioned above can also achieve a precise match between the power allocation requirements of the heating film and the actual power of the heating film, avoiding excessive power allocation. Secondly, the remaining power between the rated maximum power of the heating film and the actual power of the heating film can be reasonably allocated to other accessories such as the positive temperature coefficient heater (PTC) in the passenger compartment, thereby improving power utilization efficiency. Compared with the theoretical maximum power allocation requirement of the heating film, this scheme reduces the power allocation requirement of the heating film, which to some extent reduces the phenomenon of the heating film failing to work due to insufficient battery discharge capacity.

[0085] This provides a method for determining the target power parameters by correcting the initial power parameters based on the power correction value of the heating film.

[0086] In this embodiment, the initial power is first calculated directly using the DC bus voltage and the heating film resistance. Then, the initial value is dynamically corrected based on the measured voltage change and its rate of change within a preset time period. This can offset disturbances such as line voltage drop, contact resistance fluctuations, and temperature drift in real time, ensuring that the final target power parameter always approximates the actual output power of the heating film. This avoids unreasonable power allocation and reduces the waste of power resources. In addition, by correcting the target power parameter of the heating film calculated in real time, this application significantly reduces the power allocation requirement of the heating film, making it easier for the vehicle to meet the working requirements of the heating film, thereby improving the stability of the heating film's operation.

[0087] In this embodiment, in the above Figure 2 Based on the illustrated embodiment, a detailed process will be described prior to obtaining the DC bus voltage at the heating film power supply terminal when the battery is operating under low-temperature conditions. In one exemplary embodiment, as... Figure 6 As shown, the above method also includes:

[0088] S204. Upon receiving a heating request from the battery management system, obtain the battery's operating status.

[0089] In this embodiment, the battery management system can obtain the current cell temperature of the battery in real time and determine whether the current cell temperature is lower than a preset temperature threshold. If the current cell temperature is lower than the preset temperature threshold, a heating request is sent to the vehicle controller. After receiving the heating request sent by the BMS, the vehicle controller can obtain the battery operating condition. In the case of low temperature operating condition, the controller can obtain the DC bus voltage of the heating film power supply terminal and then determine the subsequent power parameters.

[0090] In this embodiment, after receiving a heating request from the battery management system, the DC bus voltage of the heating film power supply terminal is collected only under low-temperature operating conditions. Based on this, the target power parameters are calculated in real time with the film resistance, and then the parameters are fed back for closed-loop control. This avoids false heating at room temperature and power estimation deviation, and realizes rapid, accurate and energy-saving battery preheating at low temperatures, which not only extends battery life, but also improves the energy utilization efficiency of the whole vehicle and the reliability of low-temperature start-up.

[0091] In one embodiment, see Figure 7 A heating film control method is also provided, applied to a vehicle controller, including:

[0092] T1. When the battery is operating under AC preheating conditions, obtain the DC-DC output voltage of the DC bus of the power supply system as the DC bus voltage of the heating film power supply terminal.

[0093] T2. When the battery is operating under battery heating conditions, the voltage of the power battery pack at the DC bus of the power supply system is obtained as the DC bus voltage at the power supply end of the heating film.

[0094] T3. Determine the operating current of the heating film based on the DC bus voltage at the power supply terminal of the heating film and the resistance of the heating film;

[0095] T4. Determine the initial power parameters based on the DC bus voltage and operating current at the power supply terminal of the heating film;

[0096] T5. Obtain the voltage change parameters and voltage change rate of the heating film within a preset time period;

[0097] T6. Determine the corresponding heating film power correction value based on the voltage change parameters and voltage change rate;

[0098] T7. Based on the heating film power correction value, correct the initial power parameters to obtain the target power parameters;

[0099] T8. Send the target power parameters to the battery management system; the target power parameters are used to control the heating film to heat the battery in contact with the battery.

[0100] It should be noted that the descriptions of T1-T8 above can be found in the relevant descriptions in the above embodiments, and their effects are similar, so they will not be repeated here.

[0101] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0102] Based on the same inventive concept, this application also provides a heating film control device for implementing the heating film control method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in one or more heating film control device embodiments provided below can be found in the limitations of the heating film control method described above, and will not be repeated here.

[0103] In one exemplary embodiment, such as Figure 8 As shown, a heating film control device is provided, comprising: an acquisition module 10, a determination module 11, and a transmission module 12, wherein:

[0104] The acquisition module 10 is used to acquire the DC bus voltage of the heating film power supply terminal when the battery is operating under low temperature conditions.

[0105] Module 11 is used to determine the target power parameters of the heating film based on the DC bus voltage and the resistance of the heating film.

[0106] The sending module 12 is used to send the target power parameters to the battery management system; the target power parameters are used to control the heating film to heat the battery.

[0107] In an exemplary embodiment, the determining module 11 includes:

[0108] The determination unit is specifically used to determine the initial power parameters of the heating film based on the DC bus voltage and the resistance of the heating film.

[0109] The correction unit is specifically used to correct the initial power parameters based on the voltage change parameters and voltage change rate of the heating film within a preset time period, so as to obtain the target power parameters.

[0110] In an exemplary embodiment, the correction unit is further configured to determine the corresponding heating film power correction value based on the voltage change parameter and the voltage change rate; and to correct the initial power parameter based on the heating film power correction value to obtain the target power parameter.

[0111] In an exemplary embodiment, the operating current of the heating film is determined based on the DC bus voltage and the resistance of the heating film; the initial power parameters are determined based on the DC bus voltage and the operating current.

[0112] In an exemplary embodiment, the aforementioned low-temperature operating condition is an AC preheating condition. The aforementioned acquisition module 10 is further configured to acquire the DC-DC output voltage of the DC bus of the power supply system as the DC bus voltage of the heating film power supply terminal when the battery operating condition is an AC preheating condition.

[0113] In an exemplary embodiment, the aforementioned low-temperature operating condition is a battery heating condition. The aforementioned acquisition module 10 is further configured to acquire the power battery pack voltage of the power supply system DC bus as the DC bus voltage of the heating film power supply terminal when the battery operating condition is a battery heating condition.

[0114] In an exemplary embodiment, the acquisition module 10 is further configured to acquire the battery operating condition when a heating request is received from the battery management system.

[0115] Each module in the aforementioned heating film control device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0116] In one exemplary embodiment, a vehicle controller is provided, which may be a server, and its internal structure diagram may be as follows. Figure 9As shown, the vehicle controller includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operating system and computer programs in the non-volatile storage media. The database stores heating film and battery data. The I / O interfaces allow the processor to exchange information with external devices. The communication interface allows communication with external terminals via a network connection. When the computer program is executed by the processor, it implements a heating film control method.

[0117] Those skilled in the art will understand that Figure 9 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the vehicle controller to which the present application is applied. A specific vehicle controller may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0118] In one exemplary embodiment, a vehicle controller is provided, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0119] Under the condition that the battery is operating at low temperature, obtain the DC bus voltage at the power supply terminal of the heating film;

[0120] The target power parameters of the heating film are determined based on the DC bus voltage and the resistance of the heating film.

[0121] The target power parameters are sent to the battery management system; the target power parameters are used to control the heating film to heat the battery in contact with it.

[0122] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0123] The initial power parameters of the heating film are determined based on the DC bus voltage and the resistance of the heating film.

[0124] Based on the voltage change parameters and voltage change rate of the heating film within a preset time period, the initial power parameters are corrected to obtain the target power parameters.

[0125] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0126] Determine the corresponding heating film power correction value based on the voltage change parameters and voltage change rate;

[0127] Based on the heating film power correction value, the initial power parameters are corrected to obtain the target power parameters.

[0128] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0129] The operating current of the heating film is determined based on the DC bus voltage and the resistance of the heating film.

[0130] The initial power parameters are determined based on the DC bus voltage and operating current.

[0131] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0132] When the battery is operating under AC preheating conditions, the DC bus output voltage of the power supply system is obtained as the DC bus voltage of the heating film power supply terminal.

[0133] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0134] When the battery is operating under battery heating conditions, the voltage of the power battery pack at the DC bus of the power supply system is obtained as the DC bus voltage at the power supply end of the heating film.

[0135] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0136] Upon receiving a heating request from the battery management system, the battery's operating status is obtained.

[0137] In one embodiment, a vehicle is also provided, which includes the vehicle controller described in the above embodiments.

[0138] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0139] Under the condition that the battery is operating at low temperature, obtain the DC bus voltage at the power supply terminal of the heating film;

[0140] The target power parameters of the heating film are determined based on the DC bus voltage and the resistance of the heating film.

[0141] The target power parameters are sent to the battery management system; the target power parameters are used to control the heating film to heat the battery in contact with it.

[0142] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0143] The initial power parameters of the heating film are determined based on the DC bus voltage and the resistance of the heating film.

[0144] Based on the voltage change parameters and voltage change rate of the heating film within a preset time period, the initial power parameters are corrected to obtain the target power parameters.

[0145] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0146] Determine the corresponding heating film power correction value based on the voltage change parameters and voltage change rate;

[0147] Based on the heating film power correction value, the initial power parameters are corrected to obtain the target power parameters.

[0148] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0149] The operating current of the heating film is determined based on the DC bus voltage and the resistance of the heating film.

[0150] The initial power parameters are determined based on the DC bus voltage and operating current.

[0151] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0152] When the battery is operating under AC preheating conditions, the DC bus output voltage of the power supply system is obtained as the DC bus voltage of the heating film power supply terminal.

[0153] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0154] When the battery is operating under battery heating conditions, the voltage of the power battery pack at the DC bus of the power supply system is obtained as the DC bus voltage at the power supply end of the heating film.

[0155] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0156] Upon receiving a heating request from the battery management system, the battery's operating status is obtained.

[0157] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0158] Under the condition that the battery is operating at low temperature, obtain the DC bus voltage at the power supply terminal of the heating film;

[0159] The target power parameters of the heating film are determined based on the DC bus voltage and the resistance of the heating film.

[0160] The target power parameters are sent to the battery management system; the target power parameters are used to control the heating film to heat the battery in contact with it.

[0161] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0162] The initial power parameters of the heating film are determined based on the DC bus voltage and the resistance of the heating film.

[0163] Based on the voltage change parameters and voltage change rate of the heating film within a preset time period, the initial power parameters are corrected to obtain the target power parameters.

[0164] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0165] Determine the corresponding heating film power correction value based on the voltage change parameters and voltage change rate;

[0166] Based on the heating film power correction value, the initial power parameters are corrected to obtain the target power parameters.

[0167] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0168] The operating current of the heating film is determined based on the DC bus voltage and the resistance of the heating film.

[0169] The initial power parameters are determined based on the DC bus voltage and operating current.

[0170] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0171] When the battery is operating under AC preheating conditions, the DC bus output voltage of the power supply system is obtained as the DC bus voltage of the heating film power supply terminal.

[0172] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0173] When the battery is operating under battery heating conditions, the voltage of the power battery pack at the DC bus of the power supply system is obtained as the DC bus voltage at the power supply end of the heating film.

[0174] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0175] Upon receiving a heating request from the battery management system, the battery's operating status is obtained.

[0176] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0177] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0178] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for controlling a heating film, characterized in that, Applied to a vehicle controller, the method includes: Under the condition that the battery is operating at low temperature, obtain the DC bus voltage at the power supply terminal of the heating film; The target power parameters of the heating film are determined based on the DC bus voltage and the resistance of the heating film. The target power parameter is sent to the battery management system; the target power parameter is used to control the heating film to heat the battery in contact with it.

2. The method according to claim 1, characterized in that, Determining the target power parameters of the heating film based on the DC bus voltage and the resistance of the heating film includes: The initial power parameters of the heating film are determined based on the DC bus voltage and the resistance of the heating film. Based on the voltage change parameters and voltage change rate of the heating film within a preset time period, the initial power parameters are corrected to obtain the target power parameters.

3. The method according to claim 2, characterized in that, The step of correcting the initial power parameters based on the voltage change parameters and voltage change rate of the heating film within a preset time period to obtain the target power parameters includes: Based on the voltage change parameters and the voltage change rate, determine the corresponding heating film power correction value; The initial power parameters are corrected based on the heating film power correction value to obtain the target power parameters.

4. The method according to claim 2, characterized in that, Determining the initial power parameters of the heating film based on the DC bus voltage and the resistance of the heating film includes: The operating current of the heating film is determined based on the DC bus voltage and the resistance of the heating film. The initial power parameters are determined based on the DC bus voltage and the operating current.

5. The method according to any one of claims 1-4, characterized in that, The low-temperature operating condition is an AC preheating condition. When the battery operating condition is a low-temperature operating condition, obtaining the DC bus voltage at the heating film power supply terminal includes: When the battery is operating under AC preheating conditions, the DC-DC output voltage of the DC bus of the power supply system is obtained as the DC bus voltage of the heating film power supply terminal.

6. The method according to any one of claims 1-4, characterized in that, The low-temperature operating condition is the battery heating condition. When the battery is operating in a low-temperature condition, obtaining the DC bus voltage at the heating film power supply terminal includes: When the battery is operating under the battery heating condition, the power battery pack voltage of the DC bus of the power supply system is obtained as the DC bus voltage of the heating film power supply terminal.

7. The method according to any one of claims 1-4, characterized in that, When the battery is operating under low-temperature conditions, before obtaining the DC bus voltage at the power supply terminal of the heating film, the method further includes: Upon receiving a heating request from the battery management system, the battery operating status is obtained.

8. A heating film control device, characterized in that, The device, applied to a vehicle controller, includes: The acquisition module is used to acquire the DC bus voltage of the heating film power supply terminal when the battery is operating at low temperature. The determination module is used to determine the target power parameters of the heating film based on the DC bus voltage and the resistance of the heating film; A transmitting module is used to send the target power parameters to the battery management system; the target power parameters are used to control the heating film to heat the battery in contact with the battery.

9. A vehicle controller, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 7.

10. A vehicle, characterized in that, The vehicle includes the vehicle controller as described in claim 9.

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