Electric vehicle and power battery self-heating system, control method and computer equipment

Abstract

The application discloses a self-heating control method for a power battery of an electric vehicle, which comprises the following steps: acquiring the temperature and the residual power of the power battery; connecting the power battery and a heating module based on the temperature and the residual power of the power battery; and controlling the heating module to generate an alternating current to make the power battery self-heat based on the temperature and the residual power of the power battery. The application generates the alternating current by controlling the heating module, charges and discharges the power battery, and the electric energy of the power battery is partially consumed on the internal resistance of the power battery, so that the power battery generates heat by relying on the self-resistance to realize the self-heating function, and the heating efficiency of the power battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle power battery, and particularly to an electric vehicle power battery self-heating system, a control method, computer equipment and an electric vehicle. BACKGROUND

[0002] When the temperature is low in winter, the output capacity of the power battery is reduced, and the performance of the power battery is limited in a low-temperature environment, so that the power battery cannot be charged and discharged at high power. Therefore, the power battery needs to be heated.

[0003] In the related art, the heating system is increased, such as electric heating wire, PTC material heating, and circulating water heating, which is difficult to realize, high in cost, occupies limited space and weight of the whole vehicle, and has low heat conduction efficiency and slow heating speed. SUMMARY

[0004] Therefore, the embodiments of the present application aim to provide an electric vehicle power battery self-heating system, a control method, computer equipment and an electric vehicle to improve the heating efficiency of the power battery.

[0005] To achieve the above-mentioned purpose, the technical solution of the embodiments of the present application is as follows:

[0006] In one aspect of the present application, an electric vehicle power battery self-heating control method is provided, comprising:

[0007] obtaining the temperature and the remaining capacity of the power battery;

[0008] based on the temperature and the remaining capacity of the power battery, connecting the power battery and a heating module;

[0009] based on the temperature and the remaining capacity of the power battery, controlling the heating module to generate an alternating current to heat the power battery.

[0010] Further, based on the temperature and the remaining capacity of the power battery, the step of controlling the heating module to generate an alternating current to heat the power battery specifically comprises:

[0011] determining a pulse width modulation signal according to a predetermined reference table, wherein the predetermined reference table indicates a mapping relationship between the temperature and the remaining capacity of the power battery and the pulse width modulation signal;

[0012] controlling the on-off of the switching element of the heating module to generate an alternating current to heat the power battery.

[0013] Further, the step of controlling the on-off of the switching element of the heating module specifically comprises:

[0014] controlling the two switch elements on the heating module H-bridge circuit to be turned on, wherein the series-connected switch elements are not turned on at the same time;

[0015] According to the pulse width modulation signal, two of the switch elements are closed, and the other two switch elements are turned on, so that the inductance between the bridge arms of the H-bridge circuit generates a sudden current.

[0016] Further, the control method comprises:

[0017] In the case that the temperature of the power battery reaches a first preset value or the remaining power of the power battery decreases to a second preset value, the connection between the power battery and the heating module is disconnected.

[0018] Further, when the electric vehicle is charging, the control method comprises:

[0019] According to the relationship between the remaining power of the power battery and a first threshold value and the relationship between the temperature of the power battery and a second threshold value, the connection between the power battery and the heating module and the connection between the power battery and the fast charging module are controlled.

[0020] Further, according to the relationship between the remaining power of the power battery and a first threshold value and the relationship between the temperature of the power battery and a second threshold value, the connection between the power battery and the heating module and the connection between the power battery and the fast charging module are controlled.

[0021] If the remaining power of the power battery is less than or equal to the first threshold value, the power battery and the heating module are disconnected, and the power battery and the fast charging module are connected;

[0022] If the remaining power of the power battery is greater than the first threshold value and the temperature of the power battery is less than the second threshold value, the power battery and the heating module are connected for self-heating, and the power battery and the fast charging module are disconnected;

[0023] If the remaining power of the power battery is greater than the first threshold value and the temperature of the power battery is greater than the second threshold value, the power battery and the heating module are disconnected, and the power battery and the fast charging module are connected for fast charging.

[0024] In a second aspect of the present application, an electric vehicle power battery self-heating system is provided, comprising:

[0025] a power battery;

[0026] a heating module connected to the power battery, the heating module comprising an H-bridge circuit for generating alternating current to self-heat the power battery;

[0027] A control system is electrically connected with the power battery and the heating module, and is configured to acquire the temperature and the remaining power of the power battery and control the operation of the heating module.

[0028] Further, the self-heating system comprises:

[0029] A first relay is connected between the power battery and the heating module, and is electrically connected with the control system, and is configured to control the on-off of the power battery and the heating module.

[0030] Further, the heating module comprises:

[0031] An inductor is arranged between two bridge arms of the H-bridge circuit;

[0032] A switching element is arranged on each bridge arm of the H-bridge circuit, and two switching elements are arranged in series on each bridge arm and arranged on both sides of the inductor, respectively.

[0033] A heating controller is electrically connected with the control system and the switching element, respectively, and is configured to control the opening and closing of the switching element according to the instruction of the control system.

[0034] Further, the self-heating system further comprises:

[0035] A fast charging module is electrically connected with the control system, and is configured to charge the power battery.

[0036] A second relay is connected between the power battery and the fast charging module, and is electrically connected with the control system, and is configured to control the on-off of the power battery and the fast charging module.

[0037] In a third aspect, the present application provides a computer device comprising one or more processing modules configured to execute computer instructions stored in a storage module to perform any of the above control methods.

[0038] In a fourth aspect, the present application provides an electric vehicle comprising any of the above self-heating systems and / or the above computer device.

[0039] The electric vehicle power battery self-heating system and the control method provided by the embodiments of the present application can acquire the temperature and the remaining power of the power battery, connect the power battery and the heating module based on the temperature and the remaining power of the power battery, and control the heating module to generate an alternating current to heat the power battery. The present application can control the heating module to generate an alternating current to charge and discharge the power battery. The electric energy of the power battery is partially consumed on the internal resistance of the power battery, so that the power battery can generate heat by itself to realize the self-heating function, and the heating efficiency of the power battery is improved. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 A flowchart of a self-heating control method of a power battery of an electric vehicle provided by an embodiment of the present application is shown in the figure.

[0041] Figure 2 A structural diagram of a battery management system of a power battery of an electric vehicle provided by an embodiment of the present application is shown in the figure.

[0042] Figure 3 A structural diagram of a self-heating system of a power battery of an electric vehicle provided by an embodiment of the present application is shown in the figure, wherein the heating module is shown in a dashed box.

[0043] Figure 4 A structural diagram of another self-heating system of a power battery of an electric vehicle provided by an embodiment of the present application is shown in the figure.

[0044] Figure 5 A schematic diagram of a first current flow direction of the power battery is shown in the figure. Figure 4

[0045] A schematic diagram of a second current flow direction of the power battery is shown in the figure. Figure 6 Figure 4 A schematic diagram of a second current flow direction of the power battery is shown in the figure.

[0046] Explanation of reference signs

[0047] Power battery 1; heating module 2; H-bridge circuit 21; inductor 22; switching element 23; heating controller 24; first relay 3; fast charging module 4; second relay 5. DETAILED DESCRIPTION

[0048] It should be noted that the embodiments and technical features in the present application can be combined with each other without conflict, and the detailed description in the specific embodiments should be understood as an explanation and description of the purpose of the present application, and should not be regarded as an improper limitation on the present application.

[0049] The present application will be further described in detail below in combination with the accompanying drawings and specific embodiments. The description of "first", "second", etc. in the embodiments of the present application is only for the purpose of description, and should not be understood as indicating or implying relative importance or implicitly including at least one feature. In the description of the embodiments of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0050] ​The performance of a battery is greatly affected by environmental factors. For example, the performance of a lithium ion battery, especially a lithium iron phosphate battery, is limited at low ambient temperature, and the charge and discharge capacity is greatly reduced. In the related art, a heating system, such as an electric heating wire, a PTC material heating, a circulating water heating, and the like, is added to the battery pack to achieve the heating. However, the implementation is difficult, the cost is high, the limited space and weight of the vehicle are occupied, and the heating efficiency and energy consumption efficiency are relatively low. For example, the PTC heating needs to pass through a working medium, a water cooling plate, and a shell to conduct heat to the battery, and thus the heating efficiency and energy consumption efficiency are relatively low.

[0051] Therefore, in a first aspect, an electric vehicle power battery self-heating control method is provided. Figure 1 The method comprises the following steps.

[0052] S1, obtaining the temperature and the remaining capacity of the power battery.

[0053] S2, connecting the power battery and the heating module based on the temperature and the remaining capacity of the power battery.

[0054] S3, controlling the heating module to generate an alternating current to heat the power battery based on the temperature and the remaining capacity of the power battery.

[0055] The electric vehicle power battery self-heating control method provided by the embodiments of the present application can connect the power battery 1 and the heating module 2 by judging the temperature and the remaining capacity of the power battery 1, and then generate an alternating current by controlling the heating module 2. The power of the power battery 1 is partially consumed on the internal resistance of the power battery 1, so that the power battery 1 generates heat by relying on its own impedance to realize self-heating function, thereby improving the heating efficiency of the power battery 1.

[0056] The electric vehicle of the embodiments of the present application can be an electric vehicle, an electric bicycle, or an electric tricycle, and specifically, the electric vehicle is an electric vehicle. Please refer to Figure 2 The structure of the battery management system (BMS, Battery Management System) of the power battery 1 is shown. The power battery 1 has a high-voltage output connected to a distribution box, which is connected to the electric drive assembly, PTC, electric air conditioner, and fast charging module 4 through the distribution box. The heating module 2 is arranged in the distribution box.

[0057] The control method of the embodiments of the present application will be described in detail in combination with specific embodiments.

[0058] S1, obtaining the temperature and the remaining capacity of the power battery.

[0059] In this step, the way to obtain the temperature and the remaining capacity of the power battery 1 is not limited. For example, the temperature of the power battery 1 can be obtained by a temperature sensor, and the temperature and the remaining capacity of the power battery 1 can also be detected in real time by a battery management system inside the power battery 1. For example, the temperature and the remaining capacity of the power battery 1 inside the battery management system are detected, and a heating request signal is sent to the heating module 2 according to the current state of the power battery 1. After receiving the heating request signal, the heating module 2 starts to start the self-heating function of the power battery 1.

[0060] S2, based on the temperature and the remaining capacity of the power battery, the power battery and the heating module are connected.

[0061] In this step, the power battery 1 and the heating module 2 are connected by judging the temperature and the remaining capacity of the power battery 1. Specifically, the power battery 1 and the heating module 2 can be controlled by a relay.

[0062] S3, based on the temperature and the remaining capacity of the power battery, the heating module generates an alternating current to heat the power battery.

[0063] In this step, the heating controller 24 in the heating module 2 is controlled to generate an alternating current in the circuit, and then the power battery 1 generates heat by itself to realize the self-heating function. It can be understood that the heating module 2 circuit is provided with an inductor 22 with a winding coil, and the on-off of the switching element 23 at both ends of the inductor 22 is controlled to make the inductor 22 and the winding coil resistance generate an alternating current.

[0064] In an embodiment, based on the temperature and the remaining capacity of the power battery 1, the step of controlling the heating module 2 to generate an alternating current to heat the power battery 1, specifically includes: determining a pulse width modulation signal according to a predetermined reference table, wherein the predetermined reference table indicates the mapping relationship between the temperature and the remaining capacity of the power battery and the pulse width modulation signal; controlling the on-off of the switching element 23 of the heating module 2 to generate an alternating current to heat the power battery 1.

[0065] Pulse width modulation is a kind of analog control method, which modulates the switching element 23, such as the base of a transistor or the gate of a MOS (Metal Oxide Semiconductor, insulated gate field effect) transistor, to change the on time of the transistor or MOS transistor, so as to change the output of the switching power supply.

[0066] The heating rate of the power battery 1 is related to the waveform, amplitude and frequency of the alternating current generated. It can be understood that the impedance of the power battery 1 changes at different temperatures and remaining capacities, thereby changing the waveform of the alternating current. By setting a predetermined reference table to determine the pulse width modulation signal, the required heating requirement is determined according to the temperature and remaining capacity of the power battery 1, and the current waveform, frequency and amplitude are calibrated, which is simple and fast, and improves the heating rate and efficiency of the power battery 1.

[0067] In an embodiment, the step of controlling the on-off of the switching element 23 of the heating module 2 specifically includes: controlling the two switching elements 23 on the H-bridge circuit 21 of the heating module 2 to conduct, wherein the series-connected switching elements 23 do not conduct at the same time; closing two of the switching elements 23 according to the pulse width modulation signal, and conducting the other two switching elements 23, so that the inductor 22 between the bridge arms of the H-bridge circuit 21 generates a sudden current.

[0068] It can be understood that the H-bridge circuit 21 is provided with four switching elements 23, two of which are connected in series on each bridge arm, and an inductor 22 with a winding coil is arranged between the two bridge arms. Specifically, please refer to Figures 4 to 6 The switching element 23 is a MOS tube, and the four MOS tubes are referred to as M1, M2, M3 and M4, wherein M1 and M2 are connected in series, and M3 and M4 are connected in series. Please refer to Figure 5 M1 and M4 conduct at the same time, at which time M2 and M3 are disconnected, and the arrow in the figure shows the current direction in the loop. Please refer to Figure 6 M2 and M3 conduct at the same time, at which time M1 and M4 are disconnected, and the arrow in the figure shows the current direction in the loop. It can be understood that the series-connected MOS tubes cannot conduct at the same time, and the pulse width modulation signal is determined according to the predetermined reference table to control the on-off of the MOS tubes. The on-off of the four MOS tubes is controlled through the pulse width modulation signal, so that the alternating current of the specified waveform is generated in the loop, and the heating rate and efficiency of the power battery 1 are improved.

[0069] It can be understood that the embodiment of the present application adds the H-bridge circuit 21 in the heating module 2, and generates alternating current through the switching element 23 and the configured inductor 22 and coil winding resistance. During the self-heating process, the power battery 1 can still provide stable voltage to the electric drive assembly at the port, so that the electric drive system and other electrical loads can still take power from the battery end to work. The present application does not need to use the motor controller to generate alternating current, and the motor does not need to be blocked. In this way, the power battery 1 self-heating function can be started during driving, reducing the influence of low ambient temperature on the performance of the power battery 1 during driving, and improving the reliability and driving safety of the power battery 1.

[0070] In an embodiment, the control method comprises: disconnecting the power battery 1 and the heating module 2 when the temperature of the power battery 1 reaches a first preset value or the remaining power of the power battery 1 decreases to a second preset value. The first preset value and the second preset value are calibrated by experiments or provided by the power battery cell manufacturer. It can be understood that the first preset value and the second preset value of different cells are different.

[0071] In an embodiment, when the electric vehicle is charging, the control method comprises: controlling the connection and disconnection of the power battery 1 and the heating module 2 and the connection and disconnection of the power battery 1 and the fast charging module 4 according to the relationship between the remaining power of the power battery 1 and a first threshold value and the relationship between the temperature of the power battery 1 and a second threshold value.

[0072] The first threshold value refers to the minimum value of the remaining power of the power battery 1 for starting self-heating. When the remaining power of the power battery 1 is lower than the first threshold value, starting the self-heating function will cause the power battery 1 to have an under-voltage failure. The second threshold value refers to the threshold temperature at which the battery can be charged at a high power. It can be understood that the second threshold value determines the fast charging rate of the electric vehicle, which needs to be calibrated by multiple experiments in advance.

[0073] In an embodiment, the step of controlling the connection and disconnection of the power battery 1 and the heating module 2 and the connection and disconnection of the power battery 1 and the fast charging module 4 according to the relationship between the remaining power of the power battery 1 and a first threshold value and the relationship between the temperature of the power battery 1 and a second threshold value comprises:

[0074] If the remaining power of the power battery 1 is less than or equal to the first threshold value, the power battery 1 and the heating module 2 are disconnected, and the power battery 1 and the fast charging module 4 are connected;

[0075] If the remaining power of the power battery 1 is greater than the first threshold value and the temperature of the power battery 1 is less than the second threshold value, the power battery 1 and the heating module 2 are connected for self-heating, and the power battery 1 and the fast charging module 4 are disconnected;

[0076] If the remaining power of the power battery 1 is greater than the first threshold value and the temperature of the power battery 1 is greater than the second threshold value, the power battery 1 and the heating module 2 are disconnected, and the power battery 1 and the fast charging module 4 are connected for fast charging.

[0077] It can be understood that the power battery 1 and the heating module 2 or the fast charging module 4 are connected through relays, and the connection and disconnection of the relays are controlled by a control system. Specifically, the control system is an electronic control unit (ECU), which can obtain the temperature and the remaining power of the power battery 1 obtained by a battery management system, and then control the connection and disconnection of the relays.

[0078] In the second aspect of the embodiments of the present application, please refer to Figure 3The application provides a self-heating system for a power battery of an electric vehicle, comprising a power battery 1, a heating module 2 and a control system.

[0079] The power battery 1 is not limited in type and can be a valve-regulated lead-acid storage battery, an open-tube lead-acid storage battery or a lithium iron phosphate storage battery.

[0080] The heating module 2 is connected to the power battery 1 and comprises an H-bridge circuit 21 for generating alternating current to heat the power battery 1. The H-bridge circuit 21 refers to a single-phase bridge inverter circuit comprising four switching elements 23 and a load connected to the middle of the two bridge arms. Exemplarily, the load is an inductor 22 with a winding coil to generate alternating current by opening and closing the switching elements 23.

[0081] The control system is electrically connected to the power battery 1 and the heating module 2 and is used to acquire the temperature and remaining capacity of the power battery 1 and control the operation of the heating module 2. It can be understood that the control system is a battery management system or an ECU.

[0082] In an embodiment, the self-heating system comprises a first relay 3 connected between the power battery 1 and the heating module 2 and electrically connected to the control system to control the on-off of the power battery 1 and the heating module 2. It can be understood that the control system controls the on-off of the first relay 3 by judging the temperature and remaining capacity of the power battery 1.

[0083] Exemplarily, when the electric vehicle is in a driving process or needs to use a PTC, an air conditioner or other loads, the first relay 3 can be closed to start the self-heating function so that the vehicle can normally start the self-heating function during the driving process or the operation of the load.

[0084] In an embodiment, the heating module 2 comprises the inductor 22 with the winding coil, the switching elements 23 and a heating controller 24. The inductor 22 is arranged in the middle of the two bridge arms of the H-bridge circuit 21 to generate alternating current. The switching elements 23 are arranged on the bridge arms of the H-bridge circuit 21, and two switching elements 23 are connected in series on each bridge arm and arranged on the two sides of the inductor 22. The heating controller 24 is electrically connected to the control system and the switching elements 23 to control the opening and closing of the switching elements 23 according to the instruction of the control system.

[0085] In an embodiment, the switching element 23 is an IGBT (Insulated Gate Bipolar Transistor), which is a composite full-control voltage-driven power semiconductor device composed of a bipolar transistor and a MOS tube and has the advantages of high input impedance of a MOSFET and low on-voltage drop of a power transistor.

[0086] In an embodiment, the switching element 23 is a MOS tube, which reduces the cost compared with the IGBT.

[0087] In an embodiment, the self-heating system further comprises a fast charging module 4 and a second relay 5, the fast charging module 4 is electrically connected with the control system and used for charging the power battery 1, the second relay 5 connects the power battery 1 and the fast charging module 4 and is electrically connected with the control system and used for controlling the on-off of the power battery 1 and the fast charging module 4.

[0088] Specifically, when the remaining power of the power battery 1 is less than or equal to the first threshold value, the first relay 3 is disconnected, the second relay 5 is closed, the power battery 1 and the heating module 2 are disconnected, and the power battery 1 and the fast charging module 4 are connected for charging. After a period of time, when the remaining power of the power battery 1 is greater than the first threshold value and the temperature of the power battery 1 is less than the second threshold value, the first relay 3 is closed, the second relay 5 is disconnected, the power battery 1 and the heating module 2 are connected for self-heating, and the power battery 1 and the fast charging module 4 are disconnected. When the remaining power of the power battery 1 is greater than the first threshold value and the temperature is greater than the second threshold value, the first relay 3 is disconnected, the second relay 5 is closed, the power battery 1 and the heating module 2 are disconnected, and the power battery 1 and the fast charging module 4 are connected for fast charging. In this way, energy is saved, the under-voltage failure of the power battery 1 is reduced, and the charging rate is improved.

[0089] In a third aspect, the embodiment of the present application provides a computer device, comprising one or more processing modules, the processing module is configured to execute computer instructions stored in a storage module to execute any control method of the present application. The computer device can be the control system of the above-mentioned embodiment.

[0090] In an embodiment, the embodiment of the present application provides a computer system, comprising: a programmable circuit; and software encoded on at least one computer readable medium, the software being used to program the programmable circuit to implement any control method of the present application. The computer device described above is installed with the computer system.

[0091] In an embodiment, the embodiment of the present application provides a computer readable medium, the computer readable medium has computer readable instructions thereon, the instructions, when executed by a computer, cause the computer to perform all steps of any control method of the present application. The computer readable medium can be one or more. The computer device described above is configured with the computer readable medium.

[0092] In a fourth aspect, the embodiment of the present application provides an electric vehicle, comprising any one of the above-mentioned self-heating systems; and / or the above-mentioned computer device.

[0093] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application is included in the protection scope of the present application.

Claims

1. A method for controlling the self-heating of an electric vehicle's power battery, characterized in that, include: To obtain the temperature and remaining charge of the power battery; Based on the temperature and remaining charge of the power battery, connect the power battery and the heating module; Based on the temperature and remaining charge of the power battery, a pulse width modulation signal is determined according to a predetermined lookup table, wherein the predetermined lookup table indicates the mapping relationship between the battery temperature and remaining charge of the power battery and the pulse width modulation signal; The switching elements of the H-bridge circuit of the heating module are controlled to turn on and off according to the pulse width modulation signal, so as to generate alternating current to self-heat the power battery.

2. The control method according to claim 1, characterized in that, The steps for controlling the on / off state of the switching element of the heating module specifically include: The two switching elements on the H-bridge circuit of the heating module are turned on, wherein the switching elements connected in series are not turned on at the same time; The pulse width modulation signal closes two of the switching elements and turns on the other two switching elements, causing a sudden current to be generated in the inductance between the arms of the H-bridge circuit.

3. The control method according to claim 1, characterized in that, The control method includes: When the temperature of the power battery reaches a first preset value or the remaining charge of the power battery decreases to a second preset value, the connection between the power battery and the heating module is disconnected.

4. The control method according to claim 1, characterized in that, When the electric vehicle is charging, the control method includes: Based on the relationship between the remaining charge of the power battery and a first threshold, and the relationship between the temperature of the power battery and a second threshold, the on / off state of the power battery and the heating module, as well as the on / off state of the power battery and the fast charging module, are controlled.

5. The control method according to claim 4, characterized in that, The steps for controlling the on / off switching of the power battery and the heating module, and the on / off switching of the power battery and the fast charging module, based on the relationship between the remaining charge of the power battery and a first threshold, and the relationship between the temperature of the power battery and a second threshold, specifically include: If the remaining power of the power battery is less than or equal to the first threshold, the power battery and the heating module are disconnected, and the power battery and the fast charging module are connected. If the remaining power of the power battery is greater than the first threshold and the temperature of the power battery is less than the second threshold, connect the power battery and the heating module for self-heating, and disconnect the power battery and the fast charging module. If the remaining power of the power battery is greater than the first threshold and the temperature of the power battery is greater than the second threshold, disconnect the power battery and the heating module, and connect the power battery and the fast charging module for fast charging.

6. A self-heating system for an electric vehicle power battery, characterized in that, include: Power battery; A heating module is connected to the power battery. The heating module includes an H-bridge circuit for generating alternating current to self-heat the power battery. The control system is electrically connected to the power battery and the heating module, and is used to acquire the temperature and remaining power of the power battery and control the operation of the heating module; The control system determines a pulse width modulation signal according to a predetermined lookup table, and controls the switching elements of the H-bridge circuit of the heating module to generate an alternating current to self-heat the power battery according to the pulse width modulation signal; wherein, the predetermined lookup table indicates the mapping relationship between the battery temperature and remaining power of the power battery and the pulse width modulation signal.

7. The self-heating system according to claim 6, characterized in that, The self-heating system includes: The first relay connects the power battery and the heating module, and is electrically connected to the control system, for controlling the on / off state of the power battery and the heating module.

8. The self-heating system according to claim 6, characterized in that, The heating module includes: An inductor is positioned between the two arms of the H-bridge circuit; Switching elements are disposed on the bridge arms of the H-bridge circuit, with two switching elements connected in series on each bridge arm, respectively disposed on both sides of the inductor; The heating controller is electrically connected to both the control system and the switching element, and is used to control the opening and closing of the switching element according to the instructions of the control system.

9. The self-heating system according to claim 8, characterized in that, The switching element is a MOSFET or an IGBT.

10. The self-heating system according to claim 6, characterized in that, The self-heating system also includes: A fast charging module, electrically connected to the control system, is used for charging the power battery; The second relay connects the power battery and the fast charging module, and is electrically connected to the control system, for controlling the on / off state of the power battery and the fast charging module.

11. A computer device, characterized in that, It includes one or more processing modules, the processing modules being configured to execute computer instructions stored in a storage module to perform the control method according to any one of claims 1 to 5.

12. An electric vehicle, characterized in that, Includes the self-heating system according to any one of claims 6 to 10; and / or the computer device according to claim 11.

Images