Control method for a battery heating system and battery heating system, electric vehicle

Abstract

The present disclosure relates to a control method for a battery heating system, a battery heating system, and an electric vehicle, wherein the battery heating system includes a supercapacitor and a pulse control unit, and the control method includes the steps of: obtaining a temperature value and a SOC value of a power battery; and when the temperature value is lower than a predetermined temperature threshold and the SOC value is higher than a predetermined electrical quantity threshold, issuing a heating command to the pulse control unit, so that the pulse control unit controls a bidirectional energy flow between the power battery and the supercapacitor in the form of a pulse current according to the heating command, thereby heating the power battery.

Description

Technical Field

[0001] This disclosure claims the priority of a Chinese patent application named "Control Method of Battery Heating System, Battery Heating System, and Electric Vehicle" with the patent application number 202211599149.7, filed on December 12, 2022, and the entire content thereof is incorporated herein by reference.

[0002] This disclosure relates to the technical field of power batteries, and particularly to a control method of a battery heating system, a battery heating system, and an electric vehicle.

Background Art

[0003] With the rapid development of new energy electric vehicles, the specific low-temperature range attenuation problem of pure electric vehicles has gradually become prominent. According to statistical data, the range attenuation of power batteries under low-temperature conditions generally represents about 40%, which has a great impact on the actual vehicle usage experience of users.

[0004] To solve the low-temperature range attenuation problem, currently, three power battery heating methods have been proposed. According to such heating methods, by heating the power battery, the range ability of the power battery can be improved. The three heating methods include external heating, internal heating, and combined internal and external heating, respectively. Here, internal heating primarily utilizes the power battery to generate pulsed current, completing the heating process of the power battery. However, when the power battery discharges, electrical energy can usually only be dissipated in the form of heat, leading to energy waste in the complete vehicle system. A specific example of an external heating means is to provide a heater for warming the battery, energize the heater, and raise the temperature of the battery. One specific example of an internal heating method is to effectively generate heat in the drive battery by repeatedly charging and discharging it.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] This disclosure aims to solve at least one of the technical problems of the related technologies. Therefore, one objective of this disclosure is to provide a control method for a battery heating system, thereby improving the utilization rate of electrical energy when heating the inside of a power battery, increasing the driving range of the finished vehicle under low-temperature conditions, and improving the user experience.

[0007] A second object of this disclosure is to provide a battery heating system.

[0008] A third objective of this disclosure is to provide an electric vehicle. [Means for solving the problem]

[0009] To achieve the above objective, a first embodiment of this disclosure proposes a control method for a battery heating system, the battery heating system comprising a supercapacitor and a pulse control unit, and the control method is The method includes the steps of: acquiring the temperature value and the SOC value of the power battery; and, when the temperature value is less than a preset temperature threshold and the SOC value is greater than a preset electrical quantity threshold, sending a heating command to the pulse control unit, thereby controlling the pulse control unit to perform bidirectional energy flow between the power battery and the supercapacitor in the form of a pulsed current in response to the heating command, and heating the power battery.

[0010] The control method for the battery heating system of the embodiment of this disclosure, when it is necessary to heat the power battery, first acquires the temperature value and SOC value of the power battery, and when the temperature value is smaller than a preset temperature threshold and the SOC value is larger than a preset electrical quantity threshold, sends a heating command to the pulse control unit, which controls the pulse control unit to perform bidirectional energy flow between the power battery and the supercapacitor in the form of a pulsed current in response to the heating command. By heating the power battery, the electrical energy output by the power battery can be stored in the supercapacitor, thereby improving the utilization rate of electrical energy, reducing energy waste in the finished vehicle system, and improving the driving range of the finished vehicle under low temperature conditions, thus improving the user experience.

[0011] In several feasible configurations, the energy flow between the power battery and the supercapacitor is performed alternately.

[0012] In several feasible configurations, during each heating cycle, the pulse control unit controls the power battery to output a pulsed current to the supercapacitor, and then controls the supercapacitor to output a pulsed current to the power battery.

[0013] In several feasible configurations, the width and frequency of the pulse current are determined according to the temperature and state of charge (SOC) of the power battery.

[0014] In some feasible configurations, when the temperature value is greater than or equal to a preset temperature threshold or the SOC value is less than or equal to a preset electrical threshold, the method further includes the step of sending a stop heating command to the pulse control unit to control the power battery to stop heating.

[0015] In some feasible configurations, the method further includes the step of controlling the supercapacitor to supply power to the vehicle's low-voltage electrical equipment after the power battery has stopped heating.

[0016] To achieve the above objectives, a second embodiment of the present disclosure provides a battery heating system comprising a supercapacitor, a heating control unit, and a pulse control unit, wherein the heating control unit is used to acquire a temperature value and a state of charge (SOC) value of a power battery and to issue a heating command when the temperature value is less than a preset temperature threshold and the SOC value is greater than a preset electrical threshold, and the pulse control unit is used to heat the power battery by controlling the power battery and the supercapacitor to perform bidirectional energy flow in the form of a pulsed current in response to the heating command.

[0017] The battery heating system of the embodiment of this disclosure acquires the temperature value and state of charge (SOC) value of the power battery by a heating control unit, and when the temperature value is less than a preset temperature threshold and the SOC value is greater than a preset electrical quantity threshold, a heating command is issued, and the pulse control unit controls the power battery to perform bidirectional energy flow between the power battery and the supercapacitor in the form of a pulsed current in response to the heating command, thereby heating the power battery and storing the electrical energy output by the power battery in the supercapacitor. This improves the utilization rate of electrical energy, reduces energy waste in the finished vehicle system, and improves the driving range of the finished vehicle under low temperature conditions, thereby improving the user experience.

[0018] To achieve the above objectives, a third embodiment of the present disclosure provides an electric vehicle and includes a battery heating system provided in the second embodiment of the present disclosure.

[0019] Additional aspects and benefits of this disclosure are partially shown in the following description, some of which will become apparent from the following description or will be understood through the implementation of this disclosure.

Brief Description of the Drawings

[0020] [Figure 1] It is a schematic structural diagram of a battery heating system according to an embodiment of the present disclosure. [Figure 2] It is a flowchart of a control method for a battery heating system according to an embodiment of the present disclosure. [Figure 3] It is a schematic diagram of a pulse current waveform according to an embodiment of the present disclosure. [Figure 4] It is a block diagram of a battery heating system according to another embodiment of the present disclosure.

Modes for Carrying Out the Invention

[0021] Hereinafter, embodiments of the present disclosure will be described in detail. Examples of the described embodiments are shown in the drawings, where throughout the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions. The embodiments described by referring to the following drawings are exemplary and are used only for the purpose of explaining the present disclosure and should not be construed as limiting the present disclosure.

[0022] Hereinafter, referring to the drawings, a control method for a battery heating system, a battery heating system, and an electric vehicle according to embodiments of the present disclosure will be described.

[0023] FIG. 1 is a schematic structural diagram of a battery heating system according to an embodiment of the present disclosure. To facilitate understanding of the battery heating system, first, the battery heating system will be specifically introduced below in combination with FIG. 1.

[0024] In this embodiment, the battery heating system includes a power battery, a pulse control unit, a supercapacitor, a heating control unit, and a thermal management control device. Here, the heating control unit establishes connections with the power battery, pulse control unit, supercapacitor, and thermal management control device, and the thermal management control unit, power battery, pulse control unit, and supercapacitor establish connections sequentially. The supercapacitor is further connected to the vehicle's low-voltage electrical equipment via a DC / DC converter.

[0025] The following describes the control method of the battery heating system according to an embodiment of the present disclosure, with reference to the structure of the battery heating system described above. Figure 2 is a flowchart of the control method of the battery heating system according to one embodiment of the present disclosure. The main entity executing the control method of the battery heating system according to an embodiment of the present disclosure is the heating control unit described above. As shown in Figure 2, the method includes the following steps: Step S210: The temperature value and SOC value of the power battery are obtained.

[0026] Specifically, after power is supplied to the completed vehicle, the power battery, supercapacitor, thermal management control device, and pulse control unit are first detected via the heating control unit, and it can be confirmed that the power battery, supercapacitor, thermal management control device, and pulse control unit are in a normal state. Here, a normal state means a state in which no malfunction occurs.

[0027] When the heating control unit detects that the power battery, supercapacitor, thermal management control device, and pulse control unit are all in a normal state, it can send a request to the thermal management control device and the power battery asking whether to heat. After receiving the request to heat, the thermal management control device can collect the temperature value of the power battery and transmit the temperature value to the heating control unit. In this embodiment, a temperature sensor can be provided on the power battery, and the thermal management control device can be connected to the temperature sensor. The thermal management control device can control the temperature sensor to collect the temperature value of the power battery.

[0028] After receiving a request to determine whether the power battery needs to be heated, the current SOC value (battery charge level) can be transmitted to the heating control unit. This allows the heating control unit to obtain the temperature and SOC values ​​of the power battery and determine whether the power battery needs to be heated based on these values.

[0029] In step S220, when the temperature value is less than a preset temperature threshold and the SOC value is greater than a preset electrical quantity threshold, a heating command is sent to the pulse control unit, which controls the pulse control unit to perform bidirectional energy flow between the power battery and the supercapacitor in the form of a pulsed current in response to the heating command, thereby heating the power battery.

[0030] After receiving the temperature and SOC values ​​of the power battery, the heating control unit determines whether to issue a heating command based on these values. Specifically, if the heating control unit determines that the temperature of the power battery is lower than a preset threshold, it indicates that the battery temperature is low and may affect the power battery's range. If the heating control unit determines that the SOC value of the power battery is greater than a preset threshold, it indicates that the remaining battery charge can meet the amount of electricity required for the heating process. Therefore, when the temperature is lower than a preset temperature threshold and the SOC value is greater than a preset electrical charge threshold, it is determined that the power battery needs to be heated and that the remaining battery charge can meet the required amount of electricity for heating. At this point, the heating control unit can issue a heating command to the pulse control unit.

[0031] Furthermore, the pre-set temperature threshold and the pre-set electricity threshold can both be artificially set according to actual demand and are not specifically limited here.

[0032] As one example, if a preset temperature threshold is set to 15°C and a preset electrical quantity threshold is set to 10% of the total electrical capacity of the power battery, the temperature value of the power battery received by the heating control unit is 10°C, and the state of charge (SOC) of the power battery is 12%. At this time, the heating control unit can send a heating command to the pulse control unit, thereby heating the power battery.

[0033] After the pulse control unit receives a heating command, it controls the power battery to charge and discharge in response to the heating command, thereby controlling the supercapacitor to charge and discharge. Furthermore, since the current output or input from the power battery is a pulsed current, and similarly the current output or input from the supercapacitor is also a pulsed current, bidirectional energy flow is realized, which in turn enables heating of the power battery.

[0034] In some implementations, the pulse current width and frequency are determined according to the temperature and state of charge (SOC) of the power battery. Specifically, the heating control unit can transmit the temperature and SOC values ​​to the pulse control unit. After receiving a heating command, the pulse control unit first determines the pulse current frequency and width according to the temperature and SOC values, and can then transmit the pulse current frequency and width to the power battery. The method for determining the pulse current frequency and width according to the temperature and SOC values ​​may involve providing a correspondence table for temperature, SOC values, frequency, and width values, and querying the required pulse current frequency and width values ​​corresponding to the current temperature and SOC values ​​according to the correspondence table.

[0035] After the power battery receives the frequency and width values, it can output a corresponding pulse current according to the frequency and width values. Similarly, the supercapacitor can output a pulse current to the power battery, and the pulse control unit can adjust the frequency and width values ​​of the pulse current output by the supercapacitor so that they match the frequency and width values ​​of the pulse current received by the power battery.

[0036] In several implementations, the energy flow between the power battery and the supercapacitor is alternating. Specifically, the power battery can be controlled to first output a pulsed current to the supercapacitor, and then the supercapacitor can be controlled to output a pulsed current to the power battery. Alternatively, the supercapacitor can be controlled to output a pulsed current to the power battery, and then the power battery can be controlled to output a pulsed current to the supercapacitor. This results in an alternating energy flow between the power battery and the supercapacitor. By adopting this configuration, the power battery is heated, and the electrical energy output by the power battery flows repeatedly between the power battery and the supercapacitor, thereby heating the power battery. This configuration effectively reduces the consumption of electrical energy and improves energy utilization efficiency.

[0037] In several implementations, during each heating cycle, the pulse control unit controls the power battery to output a pulsed current to the supercapacitor, and then controls the supercapacitor to output a pulsed current to the power battery. Specifically, the heating cycle can be defined as the process in which the power battery outputs a pulsed current to the supercapacitor, and the supercapacitor outputs a pulsed current to the power battery. When the pulse control unit receives a heating command, and the power battery receives the frequency and width values ​​transmitted by the pulse control unit, the power battery first outputs a pulsed current with the corresponding frequency and width values, and the pulsed current flows through the pulse control unit to the supercapacitor, causing the power battery to discharge. After a half-heating cycle, the pulse control unit adjusts the direction of the pulsed current, causing the supercapacitor to output a pulsed current. When the pulsed current passes through the pulse control unit, the pulse control unit can adjust the frequency and width values ​​of the pulsed current, thereby causing the adjusted pulsed current to flow to the power battery and cause the supercapacitor to discharge.

[0038] Furthermore, when using the above method to heat the power battery, it is not necessary to pre-store electrical energy in the supercapacitor, thus enabling the power battery to be heated via its internal electrical energy.

[0039] In some embodiments, the pulse current is a rectangular pulse current. Figure 3 is a schematic diagram of the pulse current waveform in an embodiment of the present disclosure. As shown in Figure 3, Figure 3a is the pulse current waveform output by the power battery, and Figure 3b is the pulse current waveform output by the supercapacitor.

[0040] Specifically, after receiving a heating command, the pulse control unit, power battery, and supercapacitor determine the frequency and width of the pulse current according to the temperature and SOC values, and transmit the frequency and width to the power battery. The power battery outputs a rectangular pulse current with the corresponding frequency and width. After half a cycle, the pulse control unit controls and adjusts the direction of the pulse current, causing the supercapacitor to output a rectangular pulse current to the power battery, and the pulse control unit can adjust the frequency and width of the rectangular pulse current output by the supercapacitor. After one cycle, the pulse control unit adjusts the direction of the rectangular pulse current, causing the power battery to output a rectangular pulse current to the supercapacitor. By repeating the above process, the heating of the power battery can be completed.

[0041] In some implementations, the control method further includes the step of sending a stop heating command to a pulse control unit when the temperature value is above a preset temperature threshold or the SOC value is below a preset electrical quantity threshold, thereby controlling the power battery to stop heating via the pulse control unit.

[0042] Specifically, during the process of heating the power battery, the thermal management control device can collect the temperature value of the power battery in real time and transmit the temperature value to the heating control unit. Similarly, the power battery can transmit its current SOC value to the heating control unit in real time. When the heating control unit detects that the temperature value is above a preset temperature threshold or that the SOC value is below a preset electrical quantity threshold, it sends a stop heating command to the pulse control unit. After receiving the stop heating command, the pulse control unit controls the power battery and supercapacitor to stop outputting pulse current, thereby stopping the heating of the power battery.

[0043] When the heating control unit detects that the temperature value is above a preset temperature threshold, it indicates that the current temperature value of the power battery has already reached the required temperature. When the SOC value is below a preset electrical quantity threshold, it indicates that the remaining battery charge of the power battery is no longer sufficient to support the heating process. Therefore, in both situations, it is necessary to stop heating the power battery.

[0044] In some implementations, after the power battery stops heating, the method further includes the step of controlling the supercapacitor to supply power to the vehicle's low-voltage electrical equipment. Specifically, after the power battery stops heating, the electrical energy discharged and output by the power battery can be stored in the supercapacitor. By using a DC / DC converter to convert the electrical energy stored in the supercapacitor to 12V low voltage and outputting that electrical energy to the vehicle's low-voltage electrical equipment, it is possible to supply power to the vehicle's low-voltage electrical equipment using the supercapacitor, thereby improving the utilization rate of electrical energy and reducing energy waste in the complete vehicle system.

[0045] To help you understand how to control a battery heating system, we will introduce a specific example of how to control a battery heating system.

[0046] After power is supplied to the completed vehicle, the heating control unit first detects whether the power battery, supercapacitor, thermal management control device, and pulse control unit are in a normal state. If all of the above equipment are in a normal state, the heating control unit can send a request to the thermal management control device and power battery to determine whether to heat.

[0047] After receiving a request to determine whether to heat, the thermal management control unit can collect the temperature value of the power battery and transmit the temperature value to the heating control unit. After receiving a request to determine whether the power battery should heat, it can also transmit the current state of charge (SOC) to the heating control unit. When the temperature value is less than a preset temperature threshold and the SOC value is greater than a preset electrical quantity threshold, the heating control unit transmits a heating command to the pulse control unit.

[0048] After receiving a heating command, the pulse control unit determines the frequency and width of the pulse current according to the temperature and SOC values, and transmits the frequency and width to the power battery. After receiving the frequency and width, the power battery outputs a rectangular pulse current with the corresponding frequency and width. This rectangular pulse current flows through the pulse control unit to the supercapacitor, completing the discharge of the power battery. After half a cycle, the pulse control unit adjusts the direction of the pulse current, causing the supercapacitor to output a rectangular pulse current to the power battery.

[0049] When the heating control unit detects that the current temperature of the power battery is greater than a preset temperature threshold or the SOC value is less than a preset electrical quantity threshold, it sends a stop heating command to the pulse control unit, thereby controlling the pulse control unit to stop heating the power battery.

[0050] After stopping the heating of the power battery, a DC / DC converter is used to convert the electrical energy stored in the supercapacitor to a low voltage of 12V, and this electrical energy is output to the vehicle's low-voltage electrical equipment, thereby supplying power to the vehicle's low-voltage electrical equipment.

[0051] This system controls the bidirectional energy flow between the power battery and the supercapacitor by controlling the pulse control unit, thereby heating the power battery and storing the excess electrical energy output by the supercapacitor during heating. The stored electrical energy can then be used to power the vehicle's low-voltage electrical equipment, reducing the consumption of electrical energy during the power battery heating process and improving the efficiency of electrical energy utilization. This reduces energy waste in the complete vehicle system and improves the vehicle's range under low-temperature conditions, thereby enhancing the user experience.

[0052] Figure 4 is a block diagram of a battery heating system according to another embodiment of the present disclosure.

[0053] As shown in Figure 4, the battery heating system 400 includes a supercapacitor 410, a heating control unit 420, and a pulse control unit 430. The heating control unit 420 acquires the temperature value and SOC value of the power battery and is used to issue a heating command when the temperature value is less than a preset temperature threshold and the SOC value is greater than a preset electrical threshold. The pulse control unit 430 is used to heat the power battery by controlling the power battery and the supercapacitor 410 to perform bidirectional energy flow in the form of a pulsed current in response to the heating command.

[0054] This allows the heating control unit 420 to acquire the temperature and state of charge (SOC) of the power battery, and when the temperature is lower than a preset temperature threshold and the SOC is higher than a preset electrical quantity threshold, it issues a heating command. The pulse control unit 430 then controls the system to perform bidirectional energy flow between the power battery and the supercapacitor 410 in the form of pulsed current in response to the heating command. By heating the power battery, the electrical energy output by the power battery can be stored in the supercapacitor 410, improving the utilization rate of electrical energy, reducing energy waste in the complete vehicle system, and improving the driving range of the complete vehicle under low-temperature conditions, thereby enhancing the user experience.

[0055] In some implementations, the energy flow between the power battery and the supercapacitor 410 is performed alternately.

[0056] In some implementations, during each heating cycle, the pulse control unit 430 controls the power battery to output a pulse current to the supercapacitor 410, and then controls the supercapacitor 410 to output a pulse current to the power battery.

[0057] In some implementations, the pulse control unit 430 is used to determine the width and frequency of the pulse current according to the temperature and state of charge (SOC) of the power battery.

[0058] In some implementations, the heating control unit 420 is further used to control the power battery to stop heating by sending a stop heating command to the pulse control unit 430 when the temperature value is above a preset temperature threshold or the SOC value is below a preset electrical quantity threshold.

[0059] In some implementations, the heating control unit 420 is further used to control the supercapacitor 410 to supply power to the vehicle's low-voltage electrical equipment after the power battery has stopped heating.

[0060] For the sake of brevity and ease of explanation, engineers in the relevant field will clearly understand that the specific work processes of the described module can be easily understood by referring to the corresponding processes in the method embodiments described above, and therefore, they are omitted here.

[0061] To realize the above embodiments, the Disclosure further provides an electric vehicle, which includes the battery heating system provided in the above embodiments.

[0062] Furthermore, other configurations and operations of the electric vehicle in the embodiments of this disclosure are known to those skilled in the art and are omitted here to reduce redundancy.

[0063] Furthermore, the logic and / or steps shown in the flowchart or otherwise described herein may be considered, for example, a command-executable sequence list for realizing a logical function and may be specifically implemented on any computer-readable medium for use in a command-execution system, apparatus or device (including, for example, a computer-based system, a processor system or a system that takes and executes commands from or in combination with such command-execution systems, apparatus or devices). For the purposes of this specification, “computer-readable medium” may include any command-execution system, apparatus or device or apparatus for use in combination with such command-execution systems, apparatus or devices that can contain, store, communicate, propagate or transmit any program. More specific examples of computer-readable mediums (a non-exclusive list) include electrical connections with one or more wires (electronic devices), portable computer disk enclosures (magnetic devices), random access memory (RAM), read-only memory (ROM), write-erase read-only memory (EPROM or flash memory), fiber optic devices, and portable CD-ROMs. Furthermore, the medium may be a computer-readable medium, or even paper or other suitable medium on which the program can be printed, because the program can be acquired electronically by, for example, optically scanning paper or other medium, and then editing, interpreting, or processing it in any other suitable way as needed, and then stored in computer memory.

[0064] Each part of this disclosure can be implemented in hardware, software, firmware, or a combination thereof. In the above implementation, multiple steps or methods can be implemented in software or firmware stored in memory and executed by an appropriate command execution system. For example, when implemented in hardware, it can be implemented in any one of the following, or a combination thereof, known in the art, such as discrete logic circuits having logic circuits for realizing logic functions in data signals, application-specific integrated circuits having appropriate combinational logic circuits, programmable gate arrays (PGAs), and field-programmable gate arrays (FPGAs), as in the other implementation.

[0065] In this specification, references to terms such as “one embodiment,” “several embodiments,” “example,” “specific example,” or “several examples” mean that the specific features, structures, materials, or properties described in the embodiment or example are included in at least one embodiment or example of this disclosure. In this specification, exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or properties described may be combined in appropriate ways in any one or more embodiments or examples.

[0066] Furthermore, in the description of this disclosure, the orientations or positional relationships indicated by terms such as "center," "vertical," "horizontal," "length," "width," "thickness," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" are orientations or positional relationships shown based on the drawings, and are merely intended to facilitate and simplify the description of this disclosure. They do not indicate or imply that the indicated devices or elements have a specific orientation, or that they are configured and operated in a specific orientation, and therefore should not be understood as limiting this disclosure.

[0067] Furthermore, the terms “first” and “second” are used solely for descriptive purposes and should not be understood as indicating or suggesting relative importance or specifying the number of technical features being referred to. Therefore, features designated as “first” or “second” may be explicitly or implicitly defined as including at least one such feature. In this disclosure, “plural” means at least two unless otherwise explicitly and specifically defined. For example, two or three pieces.

[0068] In this disclosure, unless otherwise expressly provided and limited, terms such as “attachment,” “connection,” “connection,” and “fixed” should be interpreted broadly, for example, and may include fixed connections, removable connections or integrations, mechanical connections or electrical connections, direct connections or indirect connections via an intermediary, internal communication between two parts, or the interaction relationship between two parts. A person skilled in the art will be able to understand the specific meaning of the above terms in this disclosure depending on the specific circumstances.

[0069] In this disclosure, unless otherwise explicitly stated or limited, if the first feature is "above" or "below" the second feature, the first and second features may be in direct contact or indirectly in contact through an intermediate medium. If the first feature is "above," "above," or "on the top surface" of the second feature, the first feature may be directly above or diagonally above the second feature, or the first feature may be at a higher horizontal altitude than the second feature. If the first feature is "below," "below," or "on the bottom surface" of the second feature, the first feature may be directly below or diagonally below the second feature, or the first feature may be at a lower horizontal altitude than the second feature.

[0070] Furthermore, although the above has already been explained by illustrating embodiments of the present disclosure, these embodiments are illustrative and cannot be understood as limitations to the present disclosure, and those skilled in the art can modify, alter, substitute, and transform the embodiments within the scope of the present disclosure.

Claims

1. A control method for a battery heating system, wherein the battery heating system includes a supercapacitor and a pulse control unit, and the control method is The steps include obtaining the temperature value and SOC value of the power battery, The step of heating the power battery is included in the following steps: When the temperature value is less than a preset temperature threshold and the SOC value is greater than a preset electrical quantity threshold, a heating command is sent to the pulse control unit, thereby controlling the pulse control unit to perform bidirectional energy flow between the power battery and the supercapacitor in the form of a pulsed current in response to the heating command, and heating the power battery. After the power battery stops heating, the method A method for controlling a battery heating system, further comprising the step of controlling the supercapacitor to supply power to an in-vehicle low-voltage electrical device.

2. A method for controlling a battery heating system according to claim 1, wherein the energy flow between the power battery and the supercapacitor is performed alternately.

3. Control method for a battery heating system according to claim 2, wherein in each heating cycle, the pulse control unit controls the power battery to output a pulse current to the supercapacitor, and then controls the supercapacitor to output a pulse current to the power battery.

4. The control method for a battery heating system according to claim 1, wherein the width and frequency of the pulse current are determined according to the temperature and SOC value of the power battery.

5. When the temperature value is greater than or equal to a preset temperature threshold or the SOC value is less than or equal to a preset electrical quantity threshold, the method is: A method for controlling a battery heating system according to any one of claims 1 to 4, further comprising the step of sending a stop heating command to the pulse control unit, thereby controlling the pulse control unit to stop heating the power battery.

6. The control method for a battery heating system according to claim 1, wherein the electricity supplied to the vehicle-mounted low-voltage electrical equipment is excess electrical energy output during heating and is stored by the supercapacitor.

7. A battery heating system, It includes a supercapacitor, a heating control unit, and a pulse control unit. The heating control unit is used to acquire the temperature value and SOC value of the power battery, and to issue a heating command when the temperature value is less than a preset temperature threshold and the SOC value is greater than a preset electrical quantity threshold. The pulse control unit is used to heat the power battery by controlling the energy flow between the power battery and the supercapacitor in the form of a pulsed current in response to the heating command, thereby enabling bidirectional energy flow. A battery heating system in which the heating control unit is further used to control the supercapacitor to supply power to vehicle-mounted low-voltage electrical equipment after the power battery has stopped heating.

8. The battery heating system according to claim 7, wherein the energy flow between the power battery and the supercapacitor is performed alternately.

9. The battery heating system according to claim 7, wherein in each heating cycle, the pulse control unit controls the power battery to output a pulse current to the supercapacitor, and then controls the supercapacitor to output a pulse current to the power battery.

10. The battery heating system according to claim 7, wherein the pulse control unit is further used to determine the width and frequency of the pulse current according to the temperature and SOC value of the power battery.

11. The battery heating system according to claim 7, wherein the heating control unit is further used to send a stop heating command to the pulse control unit when the temperature value is above a preset temperature threshold or the SOC value is below a preset electrical quantity threshold, thereby controlling the pulse control unit to stop heating the power battery.

12. The battery heating system according to claim 7, wherein the electricity supplied to the vehicle-mounted low-voltage electrical equipment is excess electrical energy output during heating and is stored by the supercapacitor.

13. An electric vehicle comprising a battery heating system according to any one of claims 7 to 12.

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