A power battery pack device, heating control system and electric vehicle

Abstract

A kind of power battery pack device, heating control system and electric vehicle, power battery pack device includes sequentially connected first power battery pack, first switch module and first energy storage module, and sequentially connected second power battery pack, second switch module and second energy storage module, first energy storage module is also connected with second energy storage module, the anode of first power battery pack is also connected with the anode of second power battery pack, or the cathode of first power battery pack is also connected with the cathode of second power battery pack.By forming loop between first power battery pack, first switch module, first energy storage module, second energy storage module, second switch module and second power battery pack, high-frequency pulse current can be formed in the loop by the alternate charge and discharge between two power battery packs, and then the high-frequency pulse current is used to heat power battery pack, the design does not need to set additional heating device, help to save cost, reduce the complexity of design.

Description

[0001] This application is a divisional application. The original application has the application number 202210147654.1 and the original application date is February 17, 2022. The entire contents of the original application are incorporated herein by reference. Technical Field

[0002] This application relates to the field of power battery heating technology, and in particular to a power battery pack device, a heating control system, and an electric vehicle. Background Technology

[0003] Lithium-ion batteries are a new type of high-voltage, high-energy-density rechargeable battery. They have advantages such as light weight, large energy storage, no pollution, no memory effect, and long service life. They have become the most commonly used battery material in the power battery packs of electric vehicles.

[0004] However, lithium batteries have a characteristic where their capacity and charging / discharging speed decrease as ambient temperature drops. Because of this, in low-temperature environments, electric vehicles typically require heating of the battery pack during startup to fully utilize its energy storage and charging / discharging capabilities. Currently, most electric vehicles on the market use heating devices around the battery pack for startup. However, this additional heating not only increases the cost of the electric vehicle but also adds complexity to its circuit design, negatively impacting the overall layout.

[0005] Therefore, further research is needed on heating solutions for power battery packs. Summary of the Invention

[0006] In view of this, this application provides a power battery pack device, a heating control system, and an electric vehicle, which form a circuit between two power battery packs and use the high-frequency pulse current generated in the circuit to heat the power battery packs, thereby solving the technical problem of high circuit cost and complexity that requires additional heating devices to heat the power battery packs.

[0007] In a first aspect, this application provides a power battery pack device, including a first battery unit and a second battery unit. The first battery unit includes a first power battery pack, a first switching module, and a first energy storage module. A first DC terminal of the first switching module is connected to the anode of the first power battery pack, a second DC terminal of the first switching module is connected to the cathode of the first power battery pack, and an AC terminal of the first switching module is connected to the first terminal of the first energy storage module. The second module includes a second power battery pack, a second switching module, and a second energy storage module. A first DC terminal of the second switching module is connected to the anode of the second power battery pack, a second DC terminal of the second switching module is connected to the cathode of the second power battery pack, and an AC terminal of the second switching module is connected to the first terminal of the second energy storage module. The second terminal of the first energy storage module is connected to the second terminal of the second energy storage module. The anode of the first power battery pack is connected to the anode of the second power battery pack, or the cathode of the first power battery pack is connected to the cathode of the second power battery pack.

[0008] In the above design, by forming a circuit between the two battery packs, a high-frequency pulse current is generated in the circuit through the alternating charging and discharging of the two battery packs. This high-frequency pulse current can then be used to heat the battery packs, achieving effective and rapid heating in low-temperature environments. This circuit design can be implemented by connecting the relevant nodes between the two battery packs with cables, without the need for additional heating devices, which helps save costs and reduce design complexity. Furthermore, by setting up dual battery packs, it is possible to switch to the other battery pack for discharge in a timely manner if one battery pack fails. In this way, the redundancy of the dual battery packs ensures the smooth operation of equipment (such as electric vehicles) using the battery packs.

[0009] In one possible design, the first switching module includes a first three-phase rectifier bridge, and the first energy storage module includes a first three-phase winding. The first ends of three windings in the first three-phase winding are connected to the three AC terminals of the first three-phase rectifier bridge, and the second ends of the three windings are connected to form the second terminal of the first energy storage module. In this design, by using a three-phase rectifier bridge as the first switching module, not only can the switching function of the first switching module be realized, but the rectification and filtering function unique to the three-phase rectifier bridge can also improve the stability of the current waveform and the energy utilization rate in the first battery cell.

[0010] In one possible design, the second switching module includes a second three-phase rectifier bridge, and the second energy storage module includes a second three-phase winding. The first ends of three windings in the second three-phase winding are connected to the three AC terminals of the second three-phase rectifier bridge, and the second ends of the three windings are connected to form the second terminal of the second energy storage module. In this design, by using a three-phase rectifier bridge as the second switching module, not only can the switching function of the second switching module be realized, but the rectification and filtering function unique to the three-phase rectifier bridge can also improve the stability of the current waveform and the energy utilization rate in the second battery cell.

[0011] In one possible design, the first three-phase winding and the second three-phase winding satisfy one of the following conditions: the first three-phase winding and the second three-phase winding are two three-phase motors; the first three-phase winding and the second three-phase winding belong to a six-phase motor; or, the first three-phase winding and the second three-phase winding belong to a motor with two independent sets of three-phase windings. Specifically, when the power battery pack is applied to an electric vehicle, the aforementioned motor can be an inherent motor in the electric vehicle. Thus, by using the inherent motor in the electric vehicle as the energy storage module in the power battery pack, the function of heating the power battery pack can be achieved using the inherent components of the electric vehicle, thereby avoiding the need for additional components and helping to save circuit costs and space.

[0012] In one possible design, the rectifier diodes in the first three-phase rectifier bridge and / or the second three-phase rectifier bridge are switching modules with anti-parallel diodes. In this way, even if the semiconductor devices in the switching module are turned off, the diodes connected in anti-parallel to the semiconductor devices can still provide freewheeling for the switching module.

[0013] In one possible design, the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module. The first and second switch modules are connected in series, the third and fourth switch modules are connected in series, and the fifth and sixth switch modules are connected in series. The non-series node of the first switch module relative to the second switch module, the non-series node of the third switch module relative to the fourth switch module, and the non-series node of the fifth switch module relative to the sixth switch module are respectively connected to the anode of the first power battery pack. The non-series node of the second switch module relative to the first switch module, the non-series node of the fourth switch module relative to the third switch module, and the non-series node of the sixth switch module relative to the fifth switch module are respectively connected to the cathode of the first power battery pack. The series nodes of the first and second switch modules, the series nodes of the third and fourth switch modules, and the series nodes of the fifth and sixth switch modules are connected to the first ends of three windings in the first three-phase winding. Accordingly, the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module, and a twelfth switch module. The seventh switch module and the eighth switch module are connected in series. The non-series node of the seventh switch module relative to the eighth switch module, the non-series node of the ninth switch module relative to the tenth switch module, and the non-series node of the eleventh switch module relative to the twelfth switch module are respectively connected to the anode of the second power battery pack. The non-series node of the eighth switch module relative to the seventh switch module, the non-series node of the tenth switch module relative to the ninth switch module, and the non-series node of the twelfth switch module relative to the eleventh switch module are respectively connected to the cathode of the second power battery pack. The series nodes of the seventh and eighth switch modules, the series nodes of the ninth and tenth switch modules, and the series nodes of the eleventh and twelfth switch modules are connected to the first ends of the three windings in the second three-phase winding. In this design, by designing the switching module as a three-phase full-wave rectifier bridge, the six switching modules on the three-phase full-wave rectifier bridge can be used to precisely control whether each connected winding is working or not, which facilitates the realization of energy storage function based on one or more windings.

[0014] Secondly, embodiments of this application provide a heating control system, including a control device and a power battery pack device as described in any of the first aspects above. The control device is used to: control a first switching module and a second switching module to control the alternating discharge of a first power battery pack and a second power battery pack, wherein the electricity discharged by the first power battery pack charges the second power battery pack, and the electricity discharged by the second power battery pack charges the first power battery pack. Thus, by controlling the alternating discharge of the two power battery packs, a high-frequency pulse current can be generated in the circuit to achieve effective and rapid heating of the power battery pack in a low-temperature environment.

[0015] In one possible design, the first energy storage module and the second energy storage module include a motor. The control device includes a main controller, a battery manager, and a motor controller. The battery manager is connected to the main controller, the first power battery pack, and the second power battery pack, respectively. The motor controller is connected to the main controller, the first switching module, the second switching module, the first energy storage module, and the second energy storage module, respectively. In this case, the battery manager is used to obtain the state of charge and current temperature of each power battery pack. The motor controller is used to obtain the operating state of each energy storage module. The main controller is also used to determine, based on the state of charge of each power battery pack, that the sum of the charges of each power battery pack is sufficient to start the electric vehicle; to determine, based on the current temperature of each power battery pack, that each power battery pack is in a low-temperature state; and to determine, based on the operating state of each energy storage module, that each energy storage module is not working. After this determination, a control signal is generated and sent to the motor controller, so that the motor controller, based on the control signal, controls the alternating discharge of the first power battery pack and the second power battery pack by controlling the conduction and cutoff of each switching module in the first switching module and the second switching module. With this design, the control device can perform heating control only when the state of the motor and battery meets the preset heating conditions, and will not perform heating control when the preset heating conditions are not met. This avoids meaningless heating operations and saves the processing resources of the control device.

[0016] In one possible design, when the first energy storage module includes a first three-phase winding and the second energy storage module includes a second three-phase winding, the control device can determine the target high-frequency pulse current based on the temperature difference between the ambient temperature and the target temperature, the preset heating time, and the preset correspondence between the temperature difference, the heating time, and the high-frequency pulse current. When the target high-frequency pulse current is less than a first current threshold, the first and second power battery packs are controlled to alternately discharge through one winding of their corresponding three-phase windings by controlling the first and second switching modules. When the target high-frequency pulse current is not less than the first current threshold and is less than the second current threshold, the first and second power battery packs are controlled to alternately discharge through two windings of their corresponding three-phase windings by controlling the first and second switching modules. When the target high-frequency pulse current is not less than the second current threshold, the first and second power battery packs are controlled to alternately discharge through three windings of their corresponding three-phase windings by controlling the first and second switching modules. In this design, by referring to the required target high-frequency pulse current, the fewest possible windings are selected from the windings that can provide the target high-frequency current to achieve heating. This ensures that the power battery pack is heated to the target temperature within the preset heating time, while minimizing the frequency of winding use and extending the motor's service life.

[0017] In one possible design, given a preset relationship between temperature difference, heating time, and high-frequency pulse current, where the temperature difference and preset heating time correspond to multiple high-frequency pulse currents, the control device first selects a target high-frequency pulse current from these multiple currents. Then, it acquires the first maximum current of the first three-phase winding at the frequency corresponding to the target high-frequency pulse current, the second maximum current of the second three-phase winding at the same frequency, and the third maximum current corresponding to the connection point of the first and second three-phase windings. If the target high-frequency pulse current is greater than the minimum of the first, second, and third maximum currents, a new target high-frequency pulse current is selected from the multiple currents. In this design, by reselecting the target high-frequency pulse current when the power battery pack cannot handle it, heating can be completed using a target high-frequency current that the power battery pack can handle, thus helping to protect the safety of the various components within the power battery pack.

[0018] In one possible design, an alternating cycle includes a first time period and a second time period, with the first time period preceding the second time period. The cathodes of the first and second power battery packs are connected, and the first switching module includes a first, second, third, fourth, fifth, and sixth switching module, while the second switching module includes a seventh, eighth, ninth, tenth, eleventh, and twelfth switching module. If the voltage of the first power battery pack is greater than the voltage of the second power battery pack, the control device is specifically used to: control the first, third, and fifth switching modules during the first sub-time period of the first time period. One or more of the switching modules are turned on, and the other switching modules are turned off except for the turned-on switching modules; during the second sub-period of the first time period, the first to twelfth switching modules are turned off; during the first sub-period of the second time period, one or more of the second, fourth, and sixth switching modules, and one or more of the seventh, ninth, and eleventh switching modules are turned on, and the other switching modules are turned off except for the turned-on switching modules; during the second sub-period of the second time period, one or more of the seventh, ninth, and eleventh switching modules are turned on, and the other switching modules are turned off except for the turned-on switching modules.

[0019] In the above design, when the first and second power battery packs share a common cathode and the voltage of the first power battery pack is greater than that of the second power battery pack, the switching modules are turned on or off according to the above control logic. This allows electrical energy to flow from the high-voltage first power battery pack to the low-voltage second power battery pack in the first period of a cycle, i.e., the power battery pack operates in Buck mode. In the second period of a cycle, electrical energy flows from the low-voltage second power battery pack to the high-voltage first power battery pack, i.e., the power battery pack operates in Boost mode. It can be seen that this design can achieve heating control in Buck mode followed by Boost mode.

[0020] In one possible design, an alternating cycle includes a first time period and a second time period, with the first time period following the second time period. The cathodes of the first and second power battery packs are connected, and the first switching module includes a first, second, third, fourth, fifth, and sixth switching module, while the second switching module includes a seventh, eighth, ninth, tenth, eleventh, and twelfth switching module. If the voltage of the first power battery pack is greater than the voltage of the second power battery pack, the control device is specifically used to: control the second, fourth, and sixth switching modules during the first sub-time period of the second time period. One or more of the switch modules, as well as one or more of the seventh, ninth, and eleventh switch modules, are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the second time period, one or more of the seventh, ninth, and eleventh switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the first sub-period of the first time period, one or more of the first, third, and fifth switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the first time period, the first to twelfth switch modules are turned off.

[0021] In the above design, when the first and second power battery packs share a common cathode and the voltage of the first power battery pack is greater than that of the second power battery pack, the switching on and off of each switching module is controlled according to the above control logic. This allows electrical energy to flow from the lower voltage second power battery pack to the higher voltage first power battery pack in the first period of a cycle, i.e., the power battery pack operates in Boost mode. In the second period of a cycle, electrical energy flows from the higher voltage first power battery pack to the lower voltage second power battery pack, i.e., the power battery pack operates in Buck mode. It can be seen that this design can achieve heating control of Boost mode followed by Buck mode.

[0022] In one possible design, an alternating cycle includes a first time period and a second time period, with the first time period preceding the second time period. The cathodes of the first and second power battery packs are connected, and the first switching module includes a first, second, third, fourth, fifth, and sixth switching module, while the second switching module includes a seventh, eighth, ninth, tenth, eleventh, and twelfth switching module. If the voltage of the second power battery pack is greater than the voltage of the first power battery pack, the control device is specifically used to: control the first, third, and fifth switching modules during the first sub-time period of the first time period. One or more of the switch modules, as well as one or more of the eighth, tenth, and twelfth switch modules, are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the first time period, one or more of the first, third, and fifth switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the first sub-period of the second time period, one or more of the seventh, ninth, and eleventh switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the second time period, the first to twelfth switch modules are turned off.

[0023] In the above design, when the first and second power battery packs share a common cathode and the voltage of the first power battery pack is lower than that of the second power battery pack, by controlling each switching module according to the above control logic, the electrical energy flows from the first power battery pack with lower voltage to the second power battery pack with higher voltage in the first period of a cycle, that is, the power battery pack device operates in Boost mode. In the second period of a cycle, the electrical energy flows from the second power battery pack with higher voltage to the first power battery pack with lower voltage, that is, the power battery pack device operates in Buck mode. It can be seen that this design can realize heating control of Boost mode followed by Buck mode.

[0024] In one possible design, an alternating cycle includes a first time period and a second time period, with the first time period following the second time period. The cathodes of the first and second power battery packs are connected, and the first switching module includes a first, second, third, fourth, fifth, and sixth switching module, while the second switching module includes a seventh, eighth, ninth, tenth, eleventh, and twelfth switching module. If the voltage of the second power battery pack is greater than the voltage of the first power battery pack, the control device is specifically used to: control the seventh, ninth, and eleventh switching modules during the first sub-time period of the second time period. One or more of the switching modules are turned on, and the other switching modules are turned off except for the turned-on switching modules; during the second sub-period of the second time period, the first to twelfth switching modules are turned off; during the first sub-period of the first time period, one or more of the first, third, and fifth switching modules, and one or more of the eighth, tenth, and twelfth switching modules are turned on, and the other switching modules are turned off except for the turned-on switching modules; during the second sub-period of the first time period, one or more of the first, third, and fifth switching modules are turned on, and the other switching modules are turned off except for the turned-on switching modules.

[0025] In the above design, when the first and second power battery packs share a common cathode and the voltage of the first power battery pack is lower than that of the second power battery pack, by controlling each switching module according to the above control logic, the electrical energy flows from the second power battery pack with higher voltage to the first power battery pack with lower voltage in the first period of a cycle, that is, the power battery pack device operates in Buck mode. In the second period of a cycle, the electrical energy flows from the first power battery pack with lower voltage to the second power battery pack with higher voltage, that is, the power battery pack device operates in Boost mode. It can be seen that this design can achieve heating in Buck mode followed by Boost mode.

[0026] In one possible design, an alternating cycle includes a first time period and a second time period, with the first time period preceding the second time period. The anodes of the first and second power battery packs are connected, and the first switching module includes a first, second, third, fourth, fifth, and sixth switching module, while the second switching module includes a seventh, eighth, ninth, tenth, eleventh, and twelfth switching module. If the voltage of the first power battery pack is greater than the voltage of the second power battery pack, the control device is specifically used to: control the second, fourth, and sixth switching modules during the first sub-time period of the first time period. One or more of the switching modules are turned on, and the other switching modules are turned off except for the turned-on switching modules; during the second sub-period of the first time period, the first to twelfth switching modules are turned off; during the first sub-period of the second time period, one or more of the first, third, and fifth switching modules, and one or more of the eighth, tenth, and twelfth switching modules are turned on, and the other switching modules are turned off except for the turned-on switching modules; during the second sub-period of the second time period, one or more of the eighth, tenth, and twelfth switching modules are turned on, and the other switching modules are turned off except for the turned-on switching modules.

[0027] In the above design, when the first and second power battery packs share a common anode and the voltage of the first power battery pack is greater than that of the second power battery pack, by controlling each switching module according to the above control logic, the electrical energy flows from the first power battery pack with higher voltage to the second power battery pack with lower voltage in the first period of a cycle, i.e., the power battery pack device operates in Buck mode. In the second period of a cycle, the electrical energy flows from the second power battery pack with lower voltage to the first power battery pack with higher voltage, i.e., the power battery pack device operates in Boost mode. It can be seen that this design can realize heating control of Buck mode followed by Boost mode.

[0028] In one possible design, an alternating cycle includes a first time period and a second time period, with the first time period following the second time period. The anodes of the first and second power battery packs are connected, and the first switching module includes a first, second, third, fourth, fifth, and sixth switching module, while the second switching module includes a seventh, eighth, ninth, tenth, eleventh, and twelfth switching module. If the voltage of the first power battery pack is greater than the voltage of the second power battery pack, the control device is specifically used to: control the first, third, and fifth switching modules during the first sub-time period of the second time period. One or more of the switch modules, as well as one or more of the eighth, tenth, and twelfth switch modules, are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the second time period, one or more of the eighth, tenth, and twelfth switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the first sub-period of the first time period, one or more of the second, fourth, and sixth switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the first time period, the first to twelfth switch modules are turned off.

[0029] In the above design, when the first and second power battery packs share a common anode and the voltage of the first power battery pack is greater than that of the second power battery pack, by controlling each switching module according to the above control logic, the electrical energy flows from the second power battery pack with lower voltage to the first power battery pack with higher voltage in the first period of a cycle, that is, the power battery pack device operates in Boost mode. In the second period of a cycle, the electrical energy flows from the first power battery pack with higher voltage to the second power battery pack with lower voltage, that is, the power battery pack device operates in Buck mode. It can be seen that this design can realize heating control of Boost mode followed by Buck mode.

[0030] In one possible design, an alternating cycle includes a first time period and a second time period, with the first time period preceding the second time period. The anodes of the first and second power battery packs are connected, and the first switching module includes a first, second, third, fourth, fifth, and sixth switching module, while the second switching module includes a seventh, eighth, ninth, tenth, eleventh, and twelfth switching module. If the voltage of the second power battery pack is greater than the voltage of the first power battery pack, the control device is specifically used to: control the second, fourth, and sixth switching modules during the first sub-time period of the first time period. One or more of the switch modules, as well as one or more of the seventh, ninth, and eleventh switch modules, are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the first time period, one or more of the second, fourth, and sixth switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the first sub-period of the second time period, one or more of the eighth, tenth, and twelfth switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the second time period, the first to twelfth switch modules are turned off.

[0031] In the above design, when the first and second power battery packs share a common anode and the voltage of the first power battery pack is lower than that of the second power battery pack, by controlling each switching module according to the above control logic, the electrical energy flows from the first power battery pack with lower voltage to the second power battery pack with higher voltage in the first period of a cycle, that is, the power battery pack device operates in Boost mode. In the second period of a cycle, the electrical energy flows from the second power battery pack with higher voltage to the first power battery pack with lower voltage, that is, the power battery pack device operates in Buck mode. It can be seen that this design can realize heating control of Boost mode followed by Buck mode.

[0032] In one possible design, an alternating cycle includes a first time period and a second time period, with the first time period following the second time period. The anodes of the first and second power battery packs are connected, and the first switching module includes a first, second, third, fourth, fifth, and sixth switching module, while the second switching module includes a seventh, eighth, ninth, tenth, eleventh, and twelfth switching module. If the voltage of the second power battery pack is greater than the voltage of the first power battery pack, the control device is specifically used to: control the eighth, tenth, and twelfth switching modules during the first sub-time period of the second time period. One or more of the switching modules are turned on, and the other switching modules are turned off except for the turned-on switching modules; during the second sub-period of the second time period, the first to twelfth switching modules are turned off; during the first sub-period of the first time period, one or more of the second, fourth, and sixth switching modules, and one or more of the seventh, ninth, and eleventh switching modules are turned on, and the other switching modules are turned off except for the turned-on switching modules; during the second sub-period of the first time period, one or more of the second, fourth, and sixth switching modules are turned on, and the other switching modules are turned off except for the turned-on switching modules.

[0033] In the above design, when the first and second power battery packs share a common anode and the voltage of the first power battery pack is lower than that of the second power battery pack, by controlling each switching module according to the above control logic, the electrical energy flows from the second power battery pack with higher voltage to the first power battery pack with lower voltage in the first period of a cycle, that is, the power battery pack device operates in Buck mode. In the second period of a cycle, the electrical energy flows from the first power battery pack with lower voltage to the second power battery pack with higher voltage, that is, the power battery pack device operates in Boost mode. It can be seen that this design can realize heating control of Buck mode followed by Boost mode.

[0034] Thirdly, this application provides a heating control method applicable to a control device connected to a power battery pack device as described in any of the first aspects above. The method includes: controlling a first power battery pack and a second power battery pack to discharge alternately by controlling a first switch module and a second switch module, wherein the electricity discharged by the first power battery pack is used to charge the second power battery pack, and the electricity discharged by the second power battery pack is used to charge the first power battery pack.

[0035] In one possible design, before controlling the first and second switching modules, the method further includes: acquiring the state of charge and current temperature of each power battery pack, as well as the operating state of each energy storage module; determining, based on the state of charge of each power battery pack, that the sum of the charges of each power battery pack is sufficient to start the electric vehicle; determining, based on the current temperature of each power battery pack, that each power battery pack is in a low-temperature state; and determining, based on the operating state of each energy storage module, that each energy storage module is not in operation.

[0036] In one possible design, when the first energy storage module includes a first three-phase winding and the second energy storage module includes a second three-phase winding, the first power battery pack and the second power battery pack are controlled to discharge alternately by controlling the first switching module and the second switching module. This includes: determining a target high-frequency pulse current based on the temperature difference between the ambient temperature and the target temperature, a preset heating time, and a preset correspondence between the temperature difference, the heating time, and the high-frequency pulse current; when the target high-frequency pulse current is less than a first current threshold, the first power battery pack and the second power battery pack are controlled to discharge alternately through one winding of their respective three-phase windings by controlling the first switching module and the second switching module; when the target high-frequency pulse current is not less than the first current threshold and is less than the second current threshold, the first power battery pack and the second power battery pack are controlled to discharge alternately through two windings of their respective three-phase windings by controlling the first switching module and the second switching module; when the target high-frequency pulse current is not less than the second current threshold, the first power battery pack and the second power battery pack are controlled to discharge alternately through three windings of their respective three-phase windings by controlling the first switching module and the second switching module.

[0037] In one possible design, where the temperature difference and the preset heating time correspond to multiple high-frequency pulse currents in the preset correspondence between temperature difference, heating time, and high-frequency pulse current, the method further includes: firstly selecting a target high-frequency pulse current from the multiple high-frequency pulse currents; then obtaining the first maximum current of the first three-phase winding at the frequency corresponding to the target high-frequency pulse current, the second maximum current of the second three-phase winding at the frequency corresponding to the target high-frequency pulse current, and the third maximum current corresponding to the connection node of the first three-phase winding and the second three-phase winding; and then, if the target high-frequency pulse current is less than the minimum value among the first maximum current, the second maximum current, and the third maximum current, reselecting the target high-frequency pulse current from the multiple high-frequency pulse currents.

[0038] In one possible design, an alternating cycle includes a first time period and a second time period, with the first time period preceding the second time period. The cathodes of the first and second power battery packs are connected, and the first switching module includes a first, second, third, fourth, fifth, and sixth switching module, while the second switching module includes a seventh, eighth, ninth, tenth, eleventh, and twelfth switching module. If the voltage of the first power battery pack is greater than the voltage of the second power battery pack, then controlling the first and second switching modules includes: controlling the first and third switching modules within the first sub-time period of the first time period. One or more of the block and the fifth switch module are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the first time period, the first to twelfth switch modules are turned off; during the first sub-period of the second time period, one or more of the second, fourth, and sixth switch modules, and one or more of the seventh, ninth, and eleventh switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the second time period, one or more of the seventh, ninth, and eleventh switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules.

[0039] In one possible design, an alternating cycle includes a first time period and a second time period, with the first time period following the second time period. The cathodes of the first and second power battery packs are connected, and the first switching module includes a first, second, third, fourth, fifth, and sixth switching module, while the second switching module includes a seventh, eighth, ninth, tenth, eleventh, and twelfth switching module. If the voltage of the first power battery pack is greater than the voltage of the second power battery pack, then controlling the first and second switching modules includes: during the first sub-time period of the second time period, controlling the second switching module, the fourth switching module, and the fifth switching module... One or more of the sixth switch module and one or more of the seventh, ninth and eleventh switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the second time period, one or more of the seventh, ninth and eleventh switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the first sub-period of the first time period, one or more of the first, third and fifth switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the first time period, the first to twelfth switch modules are turned off.

[0040] In one possible design, an alternating cycle includes a first time period and a second time period, with the first time period preceding the second time period. The cathodes of the first and second power battery packs are connected, and the first switching module includes a first, second, third, fourth, fifth, and sixth switching module, while the second switching module includes a seventh, eighth, ninth, tenth, eleventh, and twelfth switching module. If the voltage of the second power battery pack is greater than the voltage of the first power battery pack, then controlling the first and second switching modules includes: controlling the first and third switching modules within the first sub-time period of the first time period. One or more of the fifth switch module and one or more of the eighth, tenth and twelfth switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the first time period, one or more of the first, third and fifth switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the first sub-period of the second time period, one or more of the seventh, ninth and eleventh switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the second time period, the first to twelfth switch modules are turned off.

[0041] In one possible design, an alternating cycle may include a first time period and a second time period, with the first time period following the second time period. The cathodes of the first and second power battery packs are connected, and the first switching module includes a first, second, third, fourth, fifth, and sixth switching module, while the second switching module includes a seventh, eighth, ninth, tenth, eleventh, and twelfth switching module. If the voltage of the second power battery pack is greater than the voltage of the first power battery pack, then controlling the first and second switching modules includes: controlling the seventh and ninth switching modules during the first sub-time period of the second time period. One or more of the 11th switch module and the 12th switch module are turned on, and the other switch modules except those that are turned on are turned off; during the second sub-period of the second time period, the first to twelfth switch modules are turned off; during the first sub-period of the first time period, one or more of the first, third, and fifth switch modules, and one or more of the eighth, tenth, and twelfth switch modules are turned on, and the other switch modules except those that are turned on are turned off; during the second sub-period of the first time period, one or more of the first, third, and fifth switch modules are turned on, and the other switch modules except those that are turned on are turned off.

[0042] In one possible design, an alternating cycle includes a first time period and a second time period, with the first time period preceding the second time period. The anodes of the first and second power battery packs are connected, and the first switching module includes a first, second, third, fourth, fifth, and sixth switching module, while the second switching module includes a seventh, eighth, ninth, tenth, eleventh, and twelfth switching module. If the voltage of the first power battery pack is greater than the voltage of the second power battery pack, then controlling the first and second switching modules includes: controlling the second and fourth switching modules within the first sub-time period of the first time period. One or more of the block and the sixth switch module are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the first time period, the first to twelfth switch modules are turned off; during the first sub-period of the second time period, one or more of the first, third, and fifth switch modules, and one or more of the eighth, tenth, and twelfth switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the second time period, one or more of the eighth, tenth, and twelfth switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules.

[0043] In one possible design, an alternating cycle includes a first time period and a second time period, with the first time period following the second time period. The anodes of the first and second power battery packs are connected, and the first switching module includes a first, second, third, fourth, fifth, and sixth switching module, while the second switching module includes a seventh, eighth, ninth, tenth, eleventh, and twelfth switching module. If the voltage of the first power battery pack is greater than the voltage of the second power battery pack, then controlling the first and second switching modules includes: during the first sub-time period of the second time period, controlling the first and third switching modules... One or more of the fifth switch module and one or more of the eighth, tenth and twelfth switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the second time period, one or more of the eighth, tenth and twelfth switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the first sub-period of the first time period, one or more of the second, fourth and sixth switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the first time period, the first to twelfth switch modules are turned off.

[0044] In one possible design, an alternating cycle includes a first time period and a second time period, with the first time period preceding the second time period. The anodes of the first and second power battery packs are connected, and the first switching module includes a first, second, third, fourth, fifth, and sixth switching module, while the second switching module includes a seventh, eighth, ninth, tenth, eleventh, and twelfth switching module. If the voltage of the second power battery pack is greater than the voltage of the first power battery pack, then controlling the first and second switching modules includes: controlling the second and fourth switching modules within the first sub-time period of the first time period. One or more of the sixth switch module and one or more of the seventh, ninth and eleventh switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the first time period, one or more of the second, fourth and sixth switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the first sub-period of the second time period, one or more of the eighth, tenth and twelfth switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the second time period, the first to twelfth switch modules are turned off.

[0045] In one possible design, an alternating cycle includes a first time period and a second time period, with the first time period following the second time period. The anodes of the first and second power battery packs are connected, and the first switching module includes a first, second, third, fourth, fifth, and sixth switching module, while the second switching module includes a seventh, eighth, ninth, tenth, eleventh, and twelfth switching module. If the voltage of the second power battery pack is greater than the voltage of the first power battery pack, then controlling the first and second switching modules includes: during the first sub-time period of the second time period, controlling the eighth and tenth switching modules... One or more of the first and twelfth switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the second time period, the first to twelfth switch modules are turned off; during the first sub-period of the first time period, one or more of the second, fourth, and sixth switch modules, and one or more of the seventh, ninth, and eleventh switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules; during the second sub-period of the first time period, one or more of the second, fourth, and sixth switch modules are turned on, and the other switch modules are turned off except for the turned-on switch modules.

[0046] Fourthly, this application provides a heating control device including a processor connected to a memory, the processor being configured to execute a computer program stored in the memory, such that the heating control device performs the method described in any of the designs of the third aspect above.

[0047] Fifthly, this application provides a chip including a processor and a communication interface, wherein the processor can read instructions through the communication interface to execute the method corresponding to any of the designs in the third aspect above.

[0048] Sixthly, this application provides a computer-readable storage medium storing program code that, when run on a computer, causes the computer to perform the method corresponding to any of the designs in the third aspect above.

[0049] In a seventh aspect, this application provides a computer program product that, when run on a processor, implements the method corresponding to any of the designs in the third aspect above.

[0050] Eighthly, this application provides an electric vehicle including a heating control system as described in any of the designs in the second aspect above.

[0051] For the beneficial effects of the third to eighth aspects mentioned above, please refer to the technical effects that can be achieved by the corresponding designs in the first and second aspects mentioned above, which will not be repeated here. Attached Figure Description

[0052] Figure 1 An exemplary schematic diagram of an application scenario of an electric vehicle provided by an embodiment of this application is shown;

[0053] Figure 2 An exemplary schematic diagram of a possible heating control system architecture provided by the industry is shown;

[0054] Figure 3 This illustration shows a schematic diagram of the structure of a power battery pack device provided in Embodiment 1 of this application;

[0055] Figure 4 An exemplary schematic diagram of the architecture of a heating control system provided in Embodiment 1 of this application is shown;

[0056] Figure 5 An exemplary flowchart of a heating control method provided in Embodiment 1 of this application is shown.

[0057] Figure 6 An exemplary schematic diagram of the architecture of a heating control system provided in Embodiment 2 of this application is shown;

[0058] Figure 7 An exemplary circuit diagram of a heating control circuit using three windings is shown in Embodiment 2 of this application;

[0059] Figure 8 An exemplary circuit diagram of a heating control circuit using two windings is shown in Embodiment 2 of this application;

[0060] Figure 9 An exemplary circuit diagram of a heating control circuit via a winding is provided in Embodiment 2 of this application;

[0061] Figure 10 An exemplary circuit diagram of another heating control circuit using three windings is shown in Embodiment 2 of this application;

[0062] Figure 11 An exemplary circuit diagram of another heating control circuit using two windings is shown in Embodiment 2 of this application;

[0063] Figure 12 An exemplary circuit diagram of another heating control circuit provided in Embodiment 2 of this application is shown;

[0064] Figure 13An exemplary schematic diagram of the architecture of a heating control system provided in Embodiment 3 of this application is shown;

[0065] Figure 14 An exemplary circuit diagram of a heating control circuit using three windings is shown in Embodiment 3 of this application;

[0066] Figure 15 An exemplary circuit diagram of a heating control circuit using two windings is shown in Embodiment 3 of this application;

[0067] Figure 16 An exemplary circuit diagram of a heating control circuit via a winding is provided in Embodiment 3 of this application;

[0068] Figure 17 An exemplary circuit diagram of another heating control circuit using three windings is shown in Embodiment 3 of this application;

[0069] Figure 18 An exemplary circuit diagram of another heating control circuit using two windings is shown in Embodiment 3 of this application;

[0070] Figure 19 An exemplary circuit diagram of another heating control circuit provided in Embodiment 3 of this application is shown. Detailed Implementation

[0071] The solutions disclosed in this application can be applied to terminal devices that use power battery packs as their power source, particularly those using lithium-ion power battery packs. These terminal devices can be intelligent devices using power battery packs, including but not limited to: smart home devices such as televisions, robot vacuum cleaners, smart lamps, audio systems, smart lighting systems, electrical control systems, home background music systems, home theater systems, intercom systems, and video surveillance; intelligent transportation equipment such as electric vehicles, electric ships, electric drones, electric trains, electric freight trucks, and electric lorries; and intelligent manufacturing equipment such as robots, industrial equipment, intelligent logistics, and smart factories. Alternatively, terminal devices can also be computer devices using power battery packs, such as desktop computers, personal computers, and servers. It should also be understood that terminal devices can also be portable electronic devices using power battery packs, such as mobile phones, tablets, PDAs, headphones, speakers, wearable devices (such as smartwatches), in-vehicle devices, virtual reality devices, and augmented reality devices. Examples of portable electronic devices include, but are not limited to, those equipped with... Or other portable electronic devices with different operating systems. These portable electronic devices can also include, for example, laptops with touch-sensitive surfaces (such as touch panels).

[0072] In a specific application scenario, the solution disclosed in this application can be applied to electric vehicles, also known as new energy vehicles, which are vehicles driven by electric energy. Figure 1 This illustration illustrates an application scenario of an electric vehicle according to an embodiment of this application. In this example, the electric vehicle 10 mainly includes a main controller 111, a power battery pack 112, a motor control unit (MCU) 113, a motor 114, and wheels 12. The power battery pack 112 is a high-capacity, high-power battery, specifically a lithium-ion battery, often simply referred to as a lithium battery. The main controller 111 can also be called a vehicle controller. When the electric vehicle 10 is in motion, under the control of the main controller 111, the power battery pack 112 supplies power to the motor 114 through the motor controller 113. The motor 114 then converts the electrical energy provided by the power battery pack 112 into mechanical energy, thereby driving the wheels 12 to rotate and enabling the vehicle to move.

[0073] Currently, the optimal operating temperature for lithium batteries is around 20°C. When the ambient temperature is low, lithium batteries will face a series of problems, including but not limited to: (1) At low temperatures, the activity of the positive electrode material of the lithium battery cell decreases, resulting in a decrease in the number of lithium ions moving inside the cell and a loss of capacity; (2) At low temperatures, the electrolyte in the lithium battery solidifies, resulting in a decrease in the diffusion ability of charged ions in the positive and negative electrode materials of the cell, a decrease in the speed of energy transfer, and a decrease in the discharge speed of the lithium battery; (3) At low temperatures, the lattice of the negative electrode material of the lithium battery cell shrinks, making it difficult for lithium ions to intercalate and a decrease in the charging speed of the lithium battery. Therefore, when designing electric vehicles, it is necessary and important to know how to effectively and quickly heat the power battery pack in a low-temperature environment.

[0074] Currently, the industry typically places heating devices around the battery pack. When the electric vehicle starts, the heating devices are first activated to heat the battery pack to its optimal operating temperature before the battery pack discharges. However, this method requires additional heating devices within the electric vehicle, which not only increases the cost and space occupied but also adds to the design complexity and hinders the vehicle's installation layout.

[0075] To address the aforementioned issues, this application proposes utilizing high-frequency pulsed current to heat the power battery pack. High-frequency pulsed current is a type of current that generates a strong magnetic flux with instantaneous polarity changes in the circuit by frequently switching the direction of current flow. When a high-frequency pulsed current flows through the power battery pack, the strong magnetic flux permeates the entire pack, generating significant eddy currents within the battery pack in the opposite direction to the high-frequency pulsed current. This eddy current, under the resistance of the battery pack, generates Joule heating, causing the battery pack's temperature to rise rapidly, thus effectively and quickly heating the power battery pack.

[0076] For example, Figure 2 This diagram illustrates the architecture of a possible heating control system offered by the industry, such as... Figure 2 As shown in the example, the heating control system 11 includes a main controller 111, a motor controller 113, a power battery pack 112, a motor switch module 115 connected in parallel across the power battery pack 112, and a motor 114 connected to the AC terminal of the motor switch module 115. The motor 114 is specifically a three-phase motor. Specifically, the motor switch module 115 can be a three-phase rectifier bridge. The first DC terminal b1 of the three-phase rectifier bridge is connected to the anode of the power battery pack 112 (i.e., the terminal indicated by "+" in the figure), the second DC terminal b2 of the three-phase rectifier bridge is connected to the cathode of the power battery pack 112 (i.e., the terminal indicated by "-" in the figure), the first AC terminal a1 of the three-phase rectifier bridge is connected to the first terminal of the winding U in the three-phase motor 114, the second AC terminal a2 of the three-phase rectifier bridge is connected to the first terminal of the winding V in the three-phase motor 114, the third AC terminal a3 of the three-phase rectifier bridge is connected to the first terminal of the winding W in the three-phase motor 114, and the second terminals of the winding U, the second terminals of the winding V, and the second terminals of the winding W in the three-phase motor 114 are connected together.

[0077] Continue to refer to Figure 2As shown, when the power battery pack 112 needs to be heated, the main controller 111 can turn on or off the switch modules K1 to K6 in the motor switch module 115 through the motor controller 113, forming a circuit between the anode of the power battery pack 112, the motor switch module 115, the windings U, V and W in the three-phase motor 114, and the cathode of the power battery pack 112. This allows the electrical energy output from the anode of the power battery pack 112 to be transmitted in one direction in the circuit during the first half of a cycle, and in the opposite direction during the second half of a cycle. For example, in one instance: during the first half of a cycle, the main controller 111 controls switch modules K1, K3, and K6 to be turned on, and controls other switch modules to be turned off. Thus, the electrical energy released from the anode of the power battery pack 112 can be supplied to winding U through the turned-on switch module K1, and to winding V through the turned-on switch module K3. Afterwards, when the second ends of windings U and V are combined, the energy flows back to the cathode of the power battery pack 112 through winding W and the turned-on switch module K6. Conversely, during the first half of a cycle... During the latter half of the period, the main controller 111 controls the switching modules K2, K4, and K5 to conduct and controls the other switching modules to turn off. Thus, the electrical energy released from the anode of the power battery pack 112 can be supplied to winding W through the conducting switching module K5. Then, at the second end of winding W, it is split into two paths, supplying winding U and winding V. The electrical energy flowing from winding U flows back to the cathode of the power battery pack 112 through the conducting switching module K2, and the electrical energy flowing from winding V flows back to the cathode of the power battery pack 112 through the conducting switching module K4. Through this control method, the direction of the current in the circuit changes during the first and second halves of each cycle, thus forming a high-frequency pulse current in the circuit. This high-frequency pulse current generates heat through the internal resistance of the power battery pack 112, thereby heating the power battery pack 112.

[0078] Adopting such Figure 2 The heating control system shown can heat the power battery pack using high-frequency pulse current, but at least one of the three windings of the three-phase motor 114 has a different current direction than the other windings. In this case, the magnetic field in the three-phase motor 114 is asymmetrical, which will inevitably generate q-axis current (also known as direct axis current or longitudinal axis current, which refers to the current generated on the axis that coincides with the magnetic pole axis in the motor). The q-axis current will then generate torque on the motor shaft of the three-phase motor 114, which is not conducive to maintaining the life of the three-phase motor 114, and in severe cases, it may even directly burn out the three-phase motor 114.

[0079] In view of this, the present application provides a power battery pack device for forming a circuit between two power battery packs, and using the alternating charging and discharging between the two power battery packs to generate a high-frequency pulse current in the circuit, so as to ensure that the current direction on each winding of the motor is consistent while using the high-frequency pulse current to heat the power battery pack, thereby avoiding the generation of q-axis current and effectively maintaining the life of the motor.

[0080] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0081] It should be noted that the terms "system" and "network" in the embodiments of this application can be used interchangeably. "Multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or B exists alone, where A and B can be singular or plural. "One or more of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, one or more of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0082] Furthermore, unless otherwise specified, the ordinal numbers such as "first" and "second" mentioned in the embodiments of this application are used to distinguish multiple objects and are not used to limit the priority or importance of multiple objects. For example, "first power battery pack" and "second power battery pack" are only used to distinguish different power battery packs, and do not indicate that these power battery packs have different priorities or importance.

[0083] Example 1

[0084] Figure 3 An exemplary schematic diagram of a power battery pack device provided in Embodiment 1 of this application is shown, such as... Figure 3 As shown in this example, the power battery pack device 30 includes a first battery unit 310 and a second battery unit 320. The first battery unit 310 includes a first power battery pack 311, a first switching module 312, and a first energy storage module 313. The first DC terminal (a) of the first switching module 312... 11 Connect the anode (the electrode indicated by "+" in the diagram) of the first power battery pack 311, and the second DC terminal (a) of the first switching module 312. 12 Connect the cathode (electrode indicated by "-" in the diagram) of the first power battery pack 311, and the AC terminal (a) of the first switching module 312.13 ) connects to the first end (b) of the first energy storage module 313 11 Correspondingly, the second battery unit 320 includes a second power battery pack 321, a second switching module 322, and a second energy storage module 323. The first DC terminal (a) of the second switching module 322 21 The anode of the second power battery pack 321 is connected to the second DC terminal of the second switch module 322. 22 ) connects to the cathode of the second power battery pack 321, and the AC terminal (a) of the second switch module 322. 23 ) connects to the first end (b) of the second energy storage module 323 21 Furthermore, the second terminal (b) of the first energy storage module 313 12 ) and the second end (b) of the second energy storage module 323 22 The first power battery pack 311 and the second power battery pack 321 can be connected as follows: Figure 3 The anodes are connected as shown in (A) (also known as common anodes), or, as shown in [the diagram] Figure 3 The cathodes are connected as shown in (B) (also known as common cathode).

[0085] For example, the connection between any two of the above components can be achieved in various ways. For instance, in one example, the second terminal b of the first energy storage module 313... 12 The second end b of the second energy storage module 323 22 The connection can be achieved through cables or relays. The connection between the anode of the first power battery pack 311 and the anode of the second power battery pack 321, or the connection between the cathode of the first power battery pack 311 and the cathode of the second power battery pack 321, can be achieved through cables. Since cables and relays are relatively common and low-cost devices, connecting the relevant devices in the two battery cells using cables and relays can reduce circuit design costs while constructing a loop between the two battery cells. Of course, if cost is not a concern, these port connections can also be achieved through other components or combinations of components that can perform electrical connection functions; this application does not specifically limit this approach.

[0086] Exemplarily, the first switch module 312 and the second switch module 322 can be any component or combination of components capable of performing turn-on and turn-off functions. For example, in one example, the first switch module 312 and / or the second switch module 322 may include a three-phase rectifier bridge. The rectifier diodes in the three-phase rectifier bridge can be switch modules with anti-parallel diodes, such as insulated-gate bipolar transistors (IGBTs), silicon carbide (SiC), or other types of switch transistors with anti-parallel diodes. In this example, by using a three-phase rectifier bridge as the switch module, not only can the switching function of the switch module be realized, but also the rectification and filtering function unique to the three-phase rectifier bridge can improve the stability of the current waveform and the utilization rate of electrical energy in the battery cell.

[0087] For example, the first energy storage module 313 and the second energy storage module 323 can be any component or combination of components capable of realizing energy storage function. For instance, in one example, the first energy storage module 313 and / or the second energy storage module 323 may include a three-phase winding, specifically a three-phase winding in a motor, such as... Figure 1 The diagram illustrates the three-phase windings in the motor 114 of the electric vehicle 10. Furthermore, when both the first energy storage module 313 and the second energy storage module 323 include three-phase windings, these two three-phase windings can each belong to a separate three-phase motor, or they can both belong to a single six-phase motor, or they can both belong to a single motor with two three-phase windings, and the neutral points of the two three-phase windings in this motor (corresponding to the second end of the energy storage module) are connected. In this example, by using the inherent motor in the electric vehicle as the energy storage module in the power battery pack, the power battery pack can be implemented using the inherent components of the electric vehicle while avoiding the addition of extra components, thus helping to save circuit costs and space.

[0088] In the first embodiment described above, two battery cells are set up and the relevant nodes between the two battery cells are connected (including: the second terminal b of the first energy storage module 313). 12 The second end b of the second energy storage module 323 22The battery pack (including the anode of the first power battery pack 311 and the anode of the second power battery pack 321, or the cathode of the first power battery pack 311 and the cathode of the second power battery pack 321) can form a circuit between the two battery cells. This allows for the alternating discharge of the two power battery packs within the two battery cells to generate a high-frequency pulse current in the circuit. The heat generated when this high-frequency pulse current passes through the internal resistance of the power battery pack effectively and quickly heats the power battery pack. Therefore, using the power battery pack device in Embodiment 1, only the relevant nodes between the two battery cells need to be connected via cables or relays. This eliminates the need for additional heating devices, reducing costs and space requirements, and simplifying circuit design. It also ensures that each winding of the energy storage module has a consistent current direction, minimizing the generation of q-axis current in the energy storage module and effectively maintaining its lifespan. Furthermore, by using two power battery packs, when one battery pack fails, the system can switch to the power battery pack in the other battery cell for discharge. This redundancy ensures the smooth operation of the equipment using the power battery pack device.

[0089] Based on the above embodiment one, the heating control scheme in this application will be briefly introduced below.

[0090] by Figure 3 Taking the power battery pack device 30 shown in (B) as an example, Figure 4 This illustration shows a schematic diagram of the architecture of a heating control system provided in an embodiment of this application, as shown below. Figure 4 As shown, the heating control system includes a control device 40 and a power battery pack device 30. The cathodes of the first power battery pack 311 and the second power battery pack 321 in the power battery pack device 30 are connected. The control device 40 is connected to the first switch module 312 and the second switch module 322 in the power battery pack device 30. When the power battery pack needs to be heated, the control device 40 can control the switching modules in the first switch module 312 and the second switch module 322 to achieve alternating discharge between the first power battery pack 311 and the second power battery pack 321: when the first power battery pack 311 discharges, the released electrical energy is transmitted to the second power battery pack 321 along the V1 direction (or V2 direction) in the circuit shown in the figure to achieve charging of the second power battery pack 321; when the second power battery pack 321 discharges, the released electrical energy is transmitted in the reverse direction (or V1 direction) in the circuit to the first power battery pack 311 to achieve charging of the first power battery pack 311. Thus, by controlling the first power battery pack 311 and the second power battery pack 321 to discharge to each other alternately, a high-frequency pulse current can be generated in the circuit, and then the high-frequency pulse current is used to heat the first power battery pack 311 and the second power battery pack 321.

[0091] Furthermore, assuming that both the first energy storage module 313 and the second energy storage module 323 include three-phase windings in a motor, then Figure 5 This illustration shows a schematic flowchart of a heating control method provided in an embodiment of this application. The method is applicable to… Figure 4 The control device 40 shown is as follows: Figure 5 As shown, the method includes:

[0092] Step 501: If the control device determines that the power battery pack needs to be heated, it will acquire the battery parameters and motor parameters.

[0093] For example, continue to refer to Figure 4 As shown, the control device 40 may include a main controller 410, a battery manager 420, and a motor controller 430. The battery manager 420 and the motor controller 430 are respectively connected to the main controller 410. The battery manager 420 is also connected to the first power battery pack 311 and the second power battery pack 321. The motor controller 430 is also connected to the first switch module 312, the second switch module 322, the first energy storage module 313, and the second energy storage module 323.

[0094] In one possible scenario, in cold weather, before starting the electric vehicle, the driver can send a command to the main controller 410 to heat the power battery pack via the vehicle's LCD panel or a button on the car key. Upon receiving this command, the main controller 410 determines that the power battery pack needs to be heated, and then sends a first acquisition command to the battery manager 420 and a second acquisition command to the motor controller 430. The battery manager 420 acquires the battery parameters of each power battery pack according to the first acquisition command and sends the acquired battery parameters to the main controller 410. The battery parameters of any power battery pack may include, but are not limited to, the state of charge (SOC) of the power battery pack (also known as remaining capacity, used to indicate the ratio of the remaining capacity of the power battery pack after a period of use or long-term disuse to its fully charged capacity) and the current temperature of the power battery pack. Accordingly, the motor controller 430 acquires the motor parameters of each energy storage module according to the second acquisition instruction, and sends the acquired motor parameters to the main controller 410. The motor parameters of any energy storage module may include, but are not limited to, the operating status of the energy storage module, which is used to indicate whether the energy storage module is currently working, i.e. whether it is driving the electric vehicle.

[0095] Step 502: The control device determines whether the battery parameters and motor parameters meet the preset heating conditions. If not, proceed to step 503; if yes, proceed to step 504.

[0096] For example, the preset heating conditions may include one or more of the following conditions one to three:

[0097] Condition 1: The total charge of the power battery pack is higher than the charge required to start the electric vehicle;

[0098] Condition 2: The current temperature of the power battery pack is lower than the preset temperature threshold. The preset temperature threshold is used to indicate the highest temperature at which the power battery pack is in a low-temperature state. For example, it can be set to the lowest temperature in the temperature range that can basically exert the discharge performance of the power battery pack or a temperature slightly lower than the lowest temperature, such as 0°C or below 0°C.

[0099] Condition 3: None of the energy storage modules are in operation.

[0100] Assuming the preset heating conditions include conditions one through three above, after receiving the battery parameters of each power battery pack sent by the battery manager 420 and the motor parameters of each energy storage module sent by the motor controller 430, the main controller 410 can perform the following judgments: obtain the state of charge of the power battery pack contained in the battery parameters of each power battery pack, multiply the state of charge by the rated capacity of the power battery pack to obtain the remaining capacity of the power battery pack, and then determine whether the sum of the remaining capacity of the two power battery packs is greater than the amount of power required to start the electric vehicle; obtain the current temperature of the power battery pack contained in the battery parameters of each power battery pack, and determine whether the current temperature of each power battery pack is lower than the preset temperature threshold; obtain the operating status of the energy storage module contained in the motor parameters of each energy storage module, and determine whether each energy storage module is not running.

[0101] Furthermore, if all of the above judgments are true, it means that the motor in the electric vehicle is not running, both power battery packs in the electric vehicle are currently in a low-temperature state, and the sum of the charges of the two power battery packs is sufficient to start the electric vehicle. In this case, the main controller 410 can determine that the battery parameters and motor parameters meet the preset heating conditions. Conversely, if at least one of the above judgments is false, for example, at least one power battery pack may not be in a low-temperature state, so the electric vehicle can be started directly by discharging a power battery pack with a suitable temperature without the need for additional heating; or the motor in the electric vehicle may be running, thus making it impossible to use the motor's energy storage function to complete the above-mentioned high-frequency pulse heating operation; or the charges of the two power battery packs in the electric vehicle may not be sufficient to start the electric vehicle, so heating the power battery packs would be meaningless. In this case, the main controller 410 can determine that the battery parameters and motor parameters do not meet the preset heating conditions.

[0102] Step 503: The control device determines that an error has occurred in the process of heating the power battery pack.

[0103] In step 503 above, when the main controller 410 determines that the state of the motor and battery does not meet the preset heating conditions, it can determine that there is an error in the process of heating the power battery pack, and thus terminate the current heating control process. In this way, by only performing heating control when the state of the motor and battery meets the preset heating conditions, and not performing heating control when the preset heating conditions are not met, meaningless heating operations can be avoided, saving the processing resources of the control device.

[0104] For example, if the main controller 410 determines that an error has occurred in the process of heating the power battery pack, it can also perform other operations. For instance, if the main controller 410 determines that at least one power battery pack is not in a low-temperature state, it can directly use one or more of the at least one power battery pack to discharge to the motor, so as to quickly start the electric vehicle using the available power battery pack and improve starting efficiency. As another example, if the combined charge of the two power battery packs is insufficient to start the electric vehicle, even if all the charge from one power battery pack is transferred to the other, the charge of the other power battery pack is still insufficient to drive the motor. In this case, the main controller 410 can also send a low-charge response message to the driver so that the driver can charge the electric vehicle in time. As yet another example, if at least one energy storage module is operating, which usually means that the electric vehicle has already started and there is no need to restart it, the main controller 410 can also send a response message to the driver indicating that the energy storage module is working, so as to inform the driver that there is a problem with the current heating indication, even if all other preset heating conditions are met. The feedback response can be delivered via voice broadcast, screen display, or SMS notification. By employing different response methods for different heating scenarios, the main controller can be given more intelligent control logic, improving the overall intelligence of the electric vehicle, and saving time caused by manual intervention for subsequent operations.

[0105] Step 504: The control device determines the target high-frequency pulse current based on the temperature difference between the ambient temperature and the target temperature, the preset heating time and the preset temperature difference, and the correspondence between the heating time and the high-frequency pulse current.

[0106] For example, when the current temperatures of both power battery packs are below a preset temperature threshold and the current temperatures of the two power battery packs are different, the main controller 410 can select a target power battery pack from the two power battery packs according to actual needs and determine the current temperature of the target power battery pack as the ambient temperature. The target power battery pack could be, for example, the power battery pack with the highest current temperature, so as to heat up to the target temperature as quickly as possible, thereby starting the electric vehicle faster; or it could be the power battery pack with the most remaining charge, to improve the electric vehicle's range, etc. Conversely, when the current temperatures of both power battery packs are below the preset temperature threshold and the current temperatures of the two power battery packs are the same, the main controller 410 can determine this identical current temperature as the ambient temperature.

[0107] For example, the main controller 410 can calculate the temperature difference between the ambient temperature and the target temperature, and then, based on this temperature difference and a preset heating time, query the preset correspondence between the temperature difference, heating time, and high-frequency pulse current, and use the high-frequency pulse current corresponding to the queried temperature difference and preset heating time as the target high-frequency pulse current. The target temperature, preset heating time, and the preset correspondence between the temperature difference, heating time, and high-frequency pulse current can be pre-configured in the main controller 410 and can also be modified by the user, or they can be indicated to the main controller 410 in the aforementioned instruction for heating the power battery pack. For example, in one example, the target temperature can be pre-configured as the temperature that allows the power battery pack to perform at its best, such as 20°C. In one example, the preset heating time can be set in stages according to the ambient temperature, and the preset heating time for each stage can be reduced as the ambient temperature increases. For example, when the ambient temperature is below -20℃, the preset heating time can be set to 1 minute; when the ambient temperature is between -20℃ and -10℃, the preset heating time can be set to 0.5 minutes; and when the ambient temperature is between -10℃ and 0℃, the preset heating time can be set to 0.3 minutes. In this way, by further refining the time required for the heating process, the heating speed can be maximized while achieving heating. In another example, the correspondence between the preset temperature difference, heating time, and high-frequency pulse current can be obtained through experimental verification. For example, the heating control system can be placed under various ambient temperatures, and at each ambient temperature, the circuit in the power battery pack can be controlled to generate high-frequency pulse currents with different current frequencies and magnitudes. The heating time required to heat the power battery pack from the ambient temperature to the target temperature under each high-frequency pulse current with different current frequencies and magnitudes can be recorded. Finally, the correspondence between the temperature difference between various ambient temperatures and the target temperature, the high-frequency pulse current, and the heating time can be obtained by statistical analysis.

[0108] As further exemplified, since the high-frequency pulse current includes both current frequency and current magnitude, for the same temperature difference and preset heating time, querying the correspondence between the preset temperature difference, heating time, and high-frequency pulse current may yield multiple high-frequency pulse currents. Any two of these high-frequency pulse currents may have different current frequencies and / or current magnitudes. In this case, the main controller 410 can select one high-frequency pulse current from the multiple retrieved high-frequency pulse currents as the target high-frequency pulse current. The selection method can be random selection, selection of the high-frequency pulse current with the highest current frequency or magnitude to improve heating speed, selection of a high-frequency pulse current with a moderate current frequency or magnitude to improve heating stability, or selection of the high-frequency pulse current with the highest current frequency and magnitude from those that will not cause lithium plating (lithium plating refers to the phenomenon of lithium ions being deposited in a lithium battery at low temperatures; the lithium plating current of a lithium battery increases with increasing current frequency). This aims to maximize the heating speed while ensuring the lithium battery capacity remains unchanged, and so on.

[0109] Further exemplarily, after selecting a high-frequency pulse current as the target high-frequency pulse current in the manner described above, the main controller 410 can also obtain the first maximum current of the first energy storage module 313 at the current frequency of the target high-frequency pulse current, the second maximum current of the second energy storage module 323 at the current frequency of the target high-frequency pulse current, and the connection node (i.e., the connection node between the first energy storage module 313 and the second energy storage module 323) Figure 4 The indicated b 12 or b 22 If the magnitude of the target high-frequency pulse current is greater than the minimum of the first, second, and third maximum currents, it means that the selected target high-frequency pulse current exceeds the maximum current carrying capacity currently supported by the power battery pack. In this case, the main controller 410 can reselect a target high-frequency pulse current from the multiple high-frequency pulse currents obtained above, and then obtain a new first and second maximum current based on the current frequency of the reselected target high-frequency pulse current. When the magnitude of the reselected target high-frequency pulse current is not greater than the minimum of the third maximum current, the new first maximum current, and the second maximum current, the target high-frequency pulse current is used to perform subsequent calculations. Otherwise, the process continues to reselect a target high-frequency pulse current until a target high-frequency pulse current whose current magnitude meets the requirements is found. In this way, this example can select a target high-frequency pulse current that does not exceed the current carrying capacity of the power battery pack. Using this target high-frequency pulse current to heat the power battery pack can achieve effective and rapid heating of the power battery pack in low-temperature environments while ensuring the safety of the power battery pack.

[0110] In the above example, the first maximum current can be obtained by querying the correspondence between the current frequency and the maximum current of the first energy storage module based on the current frequency of the target high-frequency pulse current. The second maximum current can be obtained by querying the correspondence between the current frequency and the maximum current of the second energy storage module based on the current frequency of the target high-frequency pulse current. The third maximum current can be determined by the material and thickness of the cable used at the connection node. The above two correspondences and the third maximum current can be statistically obtained through experimental calibration after the power battery pack device is set up and can be configured in the main controller 410, and support certain process deviations or calibration errors.

[0111] Step 505: The control device controls each switch module in the first switch module and the second switch module according to the target high-frequency pulse current, so as to control the first power battery pack and the second power battery pack to discharge alternately.

[0112] In step 505 above, after determining the target high-frequency pulse current, the main controller 410 can generate a control signal based on the target high-frequency pulse current and send it to the motor controller 430, so that the motor controller 430 can control the conduction and cutoff of each switch module in the first switch module 312 and the second switch module 322 according to the control signal, so as to realize the alternating discharge of the first power battery pack 311 and the second power battery pack 321. For example, the alternating discharge of the first power battery pack 311 and the second power battery pack 321 can specifically refer to the first power battery pack 311 and the second power battery pack 321 discharging in a cyclical manner, with each power battery pack 311 and the second power battery pack 321 discharging once in each cycle. For instance, in the first period of a cycle, the first power battery pack 311 discharges while the second power battery pack 321 charges, and in the second period of the cycle, the second power battery pack 321 discharges while the first power battery pack 311 charges; or, in the first period of a cycle, the second power battery pack 321 discharges while the first power battery pack 311 charges, and in the second period of the cycle, the first power battery pack 311 discharges while the second power battery pack 321 charges. The duration of the first and second periods in any cycle can be the same or different, and there is no specific limitation.

[0113] In an optional embodiment, when both the first energy storage module 313 and the second energy storage module 323 are three-phase windings in a motor, either power battery pack can discharge through one or more windings of the three-phase windings, while the other power battery pack can be charged through one or more windings of the three-phase windings. Since the charging and discharging current increases with the number of windings, the main controller 410 can also be pre-configured with a first current threshold and a second current threshold. The first current threshold can, for example, be the maximum current supported by one winding of the three-phase windings as determined by experiment, and the second current threshold can, for example, be the sum of the maximum currents supported by two windings of the three-phase windings as determined by experiment. If the first current threshold is less than the second current threshold, in this case, after calculating the target high-frequency pulse current, the main controller 410 can also execute the corresponding heating control operation according to one of the following branches one to three:

[0114] Branch 1: If the target high-frequency pulse current is less than the first current threshold, it means that only a small current is needed for charging and discharging between the two power battery packs, and one winding of the three-phase winding is sufficient to provide this current. In this case, to minimize the impact of heating the power battery pack on the winding life, the main controller 410 can control the switching modules in the first switching module 312 and the second switching module 322 through the motor controller 430 to turn them on and off, so that the first power battery pack 311 and the second power battery pack 321 alternately discharge through one winding of their corresponding three-phase winding. This winding can be, for example, the winding with the least loss in the energy storage module. In this way, the target high-frequency pulse current required for alternating discharge can be achieved through one winding, and the wear of each winding can be balanced by reducing the number of times the winding with greater loss is used, thus maximizing the service life of the motor.

[0115] Branch 2: When the target high-frequency pulse current is not less than the first current threshold and less than the second current threshold, it means that a relatively moderate current is needed for charging and discharging between the two power battery packs. Using only one winding of the three-phase winding is insufficient to provide this current, but both windings are sufficient. In this case, the main controller 410 can control the switching modules in the first switching module 312 and the second switching module 322 via the motor controller 430, allowing the first power battery pack 311 and the second power battery pack 321 to alternately discharge through two windings of their corresponding three-phase windings. These two windings can, for example, be the two windings with the lowest losses in the energy storage module. This allows the flow of the target high-frequency pulse current required for alternating discharge to be achieved through two windings, while minimizing the use of windings with higher losses, ensuring the motor can be used for a longer period.

[0116] Branch 3: When the target high-frequency pulse current is not less than the second current threshold, it means that a relatively large current is needed for charging and discharging between the two power battery packs. Using only one or two windings of the three-phase windings is insufficient to provide this current; only three windings of the three-phase windings can be used. In this case, the main controller 410 can control the switching modules in the first switching module 312 and the second switching module 322 to turn on and off via the motor controller 430. This allows the first power battery pack 311 and the second power battery pack 321 to discharge alternately through the three windings of their respective three-phase windings, thus fully utilizing the maximum current carrying capacity supported by the three windings to meet the current rapid heating requirements.

[0117] It should be noted that in branch one, heating is achieved using three windings, resulting in current flowing in the same direction in all three windings. In this case, if the current magnitudes in the three windings are also the same, no q-axis current will be generated in the energy storage module; if the current magnitudes in the three windings are different, a q-axis current will be generated in the energy storage module. In contrast, branches two and three utilize one or two windings for heating, meaning that at least one winding will inevitably lack current. In this case, a q-axis current will be generated in the energy storage module.

[0118] In the above embodiments, by referring to the required target high-frequency pulse current, heating is achieved by selecting as few windings as possible from those capable of providing the target high-frequency current. This ensures that the power battery pack temperature is heated to the target temperature within the preset heating time while minimizing the frequency of winding use and maintaining the lifespan of the energy storage module. Furthermore, different numbers of windings participating in heating can generate high-frequency pulse currents of different magnitudes, thus expanding the range of pulse currents in the power battery pack device.

[0119] It should be understood that the above is only one optional implementation method. In other implementation methods, the main controller 410 may also select one, two or three windings to form a circuit and pass a high-frequency pulse current through the circuit to expand the pulse current adjustment range and improve the flexibility of heating control.

[0120] Furthermore, how to control the on / off state of the switching modules in each switching module to achieve alternating charging and discharging of the two power battery packs through one or more windings will be described in the following Embodiments 2 and 3, and will not be explained here.

[0121] Step 506: The control device determines whether the current temperature of the power battery pack is greater than or equal to the target temperature. If yes, proceed to step 507; otherwise, continue to step 505.

[0122] Step 507: The control device stops heating the power battery pack.

[0123] For example, during the heating of the power battery pack, the main controller 410 can also periodically acquire the current temperature of each power battery pack and compare the current temperature of each power battery pack with the target temperature. Once it is found that the current temperature of a power battery pack is greater than or equal to the target temperature, the heating of the power battery pack is stopped, and the power battery pack that first reaches the target temperature can be used to drive the motor to rotate, so as to start the electric vehicle as soon as possible. The current temperature of each power battery pack can be actively acquired and reported to the main controller 410 by the battery manager 420 periodically, or it can be acquired and reported by the battery manager 420 by the main controller 410 periodically. The specific method is not limited.

[0124] It should be noted that the above is only one possible example of stopping the heating of the power battery pack. In another example, when the ambient temperature in step 504 corresponds to the current temperature of the target power battery pack, the main controller 410 will only stop heating the power battery pack when the current temperature of the target power battery pack is greater than or equal to the target temperature. After stopping heating, the target power battery pack will be used to drive the motor to start the electric vehicle. It should be understood that there are many other possible stopping methods, and this application embodiment does not specifically limit them.

[0125] By adopting the above heating control scheme, a suitable target high-frequency pulse current is selected by referring to the ambient temperature and the target temperature, and a suitable number of windings are selected to form a circuit by referring to the target high-frequency pulse current. This allows for the rapid alternation of discharge between the two power battery packs without exceeding the actual current carrying capacity of the power battery pack, thereby automatically heating the power battery pack. The heating logic has good controllability and can effectively and quickly heat the power battery pack in low-temperature environments.

[0126] To further illustrate the specific implementation process of the heating control scheme, the following examples show that the first switch module 312 and the second switch module 322 both include a three-phase rectifier bridge, and the first energy storage module 313 and the second energy storage module 323 both include a three-phase winding. The specific control logic of the heating power battery pack will be further illustrated through Examples 2 and 3.

[0127]

Example 2

[0128] Figure 6 An exemplary schematic diagram of the architecture of a heating control system provided in Embodiment 2 of this application is shown, such as... Figure 6As shown, in this example, the heating control system includes a control device 40 and a power battery pack device 30. The power battery pack device 30 includes a first power battery pack 311, a first switching module 312, a first energy storage module 313, a second power battery pack 321, a second switching module 322, and a second energy storage module 323. The cathode of the first power battery pack 311 is connected to the cathode of the second power battery pack 321. The first switching module 312 includes a first three-phase rectifier bridge, and the second switching module 322 includes a second three-phase rectifier bridge. The rectifier diodes in the first and second three-phase rectifier bridges are switching modules with anti-parallel diodes, such as... Figure 6 The illustrated IGBT is a switching module that includes a diode and a transistor connected in parallel, with the transistor's conduction direction opposite to that of the diode. The first energy storage module 313 includes a first three-phase winding, comprising winding U1, winding V1, and winding W1. The second energy storage module 323 includes a second three-phase winding, comprising winding U2, winding V2, and winding W2. The control device 40 includes a main controller 410 and a battery manager 420 and a motor controller 430 connected to the main controller 410. The battery manager 420 is also connected to a first power battery pack 311 and a second power battery pack 321. The motor controller 430 is also connected to a first switching module 312, a first energy storage module 313, a second switching module 322, and a second energy storage module 323.

[0129] As further exemplified, see [link to previous article]. Figure 6 As shown, the first power battery pack 311 may include power battery packs V connected in series. 01 And resistor R1, the second power battery pack 321 may include a power battery pack V connected in series. 02 and resistor R2. Wherein, the power battery pack V 01 The anode of the battery is connected to the first terminal of resistor R1, and the second terminal of resistor R1 serves as the anode of the first power battery pack 311. The power battery pack V... 01 The cathode serves as the cathode of the first power battery pack 311, power battery pack V 02 The anode of the battery is connected to the first end of resistor R2, and the second end of resistor R2 serves as the anode of the second power battery pack 321. Power battery pack V... 02 The cathode serves as the cathode of the second power battery pack 321, and the power battery pack V 01 cathode and power battery pack V 02The cathodes can be connected by cables to achieve a common cathode for the two power battery packs. The resistor R1 in the first power battery pack 311 or the resistor R2 in the second power battery pack 321 can be used to adjust the current in the circuit. Specifically, resistor R1 or resistor R2 can also be set as variable resistors to increase the flexibility of current adjustment. It should be understood that in other examples, the first power battery pack 311 may also include only power battery pack V. 01 Excluding resistor R1, the second power battery pack 321 can also only include power battery pack V. 02 However, resistor R2 is not included, and this application does not specifically limit this aspect in the embodiments.

[0130] As further exemplified, see [link to previous article]. Figure 6 As shown, the power battery pack 30 may further include capacitor C1 and / or capacitor C2. Capacitor C1 is connected in parallel across the two ends of the first power battery pack 311, and capacitor C2 is connected in parallel across the two ends of the second power battery pack 321. In the circuit formed by the first power battery pack 311 and the second power battery pack 321, when the voltage drops due to some unstable factors, capacitor C1 or capacitor C2 will discharge; when the voltage rises due to some unstable factors, capacitor C1 or capacitor C2 will charge. Therefore, capacitor C1 or capacitor C2 is used to maintain the stability of the voltage in the circuit, thus protecting the circuit components.

[0131] As further exemplified, see [link to previous article]. Figure 6 As shown, the first switch module 312 may include a first switch module K connected in series. 11 Second switch module K 12 The third switch module K connected in series 13 and the fourth switch module K 14 and the fifth switch module K connected in series 15 and the sixth switch module K 16 The second switch module 322 may include a seventh switch module K connected in series. 21 and the eighth switch module K 22 The ninth switch module K connected in series 23 and the tenth switch module K 24 and the eleventh switch module K connected in series 25 and the twelfth switch module K 26 Among them, the first switch module K 11 Relative to the second switch module K 12 One end of the non-series node m 11 Third switch module K 13 Compared to the fourth switch module K 14 One end of the non-series node m 13 and the fifth switch module K 15Compared to the sixth switch module K 16 One end of the non-series node m 15 Connecting the anode of the first power battery pack 311, the second switch module K 12 Relative to the first switch module K 11 One end of the non-series node m 12 Fourth switch module K 14 Compared to the third switch module K 13 One end of the non-series node m 14 and the sixth switch module K 16 Compared to the fifth switch module K 15 One end of the non-series node m 16 Connect the cathode of the first power battery pack 311, and the first switch module K 11 Second switch module K 12 Serial node a 131 Connect the first terminal (terminal marked "1" in the diagram) of winding U1 in the first three-phase winding, and the third switch module K. 13 and the fourth switch module K 14 Serial node a 132 Connect the first terminal of winding V1 in the first three-phase winding, and the fifth switch module K 15 and the sixth switch module K 16 Serial node a 133 Connect the first terminal of winding W1 in the first three-phase winding. Correspondingly, the seventh switch module K... 21 Compared to the eighth switch module K 22 One end of the non-series node m 21 Ninth switch module K 23 Compared to the tenth switch module K 24 One end of the non-series node m 23 and the eleventh switch module K 25 Relative to the twelfth switch module K 26 One end of the non-series node m 25 Connect the anode of the second power battery pack 321, and the eighth switch module K 22 Compared to the seventh switch module K 21 One end of the non-series node m 22 10th Switch Module K 24 Compared to the ninth switch module K 23 One end of the non-series node m 24 and the twelfth switch module K 26 Compared to the eleventh switch module K 25 One end of the non-series node m 26 Connect the cathode of the second power battery pack 321, and the seventh switch module K 21 and the eighth switch module K 22Serial node a 231 Connect the first end of winding U2 in the second three-phase winding, and the ninth switch module K 23 and the tenth switch module K 24 Serial node a 232 Connect the first terminal of winding V2 in the second and third phase windings, and the eleventh switch module K. 25 and the twelfth switch module K 26 Serial node a 233 Connect the first end of winding W2 in the second three-phase winding. Furthermore, the second end of winding U1 (the end marked "2" in the diagram), the second end of winding V1, and the second end of winding W1 in the first three-phase winding are connected to form the second end b of the first energy storage module 313. 12 The second end of winding U2, the second end of winding V2, and the second end of winding W2 in the second three-phase winding are connected to form the second end b of the second energy storage module 323. 22 The second terminal b of the first energy storage module 313 12 After being connected to the second end, it forms the second end b of the second energy storage module 323. 22 Connections are made via cables or relays.

[0132] use Figure 6 The heating control system shown allows the main controller 410 to control the switching module K via the motor controller 430 when heating the power battery pack. 11 ~K 16 and switch module K 21 ~K 26 The switching on or off of the power battery pack V 01 One or more of the following components—resistor R1, winding U1, winding V1, winding W1, winding U2, winding V2, winding W2, resistor R2, and power battery pack V2—form a circuit under the action of a conducting switching module. This causes the current direction in the circuit to differ between the previous and subsequent periods within a cycle, thereby generating a high-frequency pulse current in the circuit. The Joule heat generated by the internal resistance of power battery packs V1 and V2 when the high-frequency pulse current flows through them is used to heat power battery packs V1 and V2.

[0133] In one optional embodiment, the main controller 410 controls the switch module K via the motor controller 430. 11 ~K 16 and switch module K 21 ~K 26Previously, the heating mode corresponding to the power battery pack 30 could also be obtained. This heating mode could be either a Buck-then-Boost mode or a Boost-then-Buck mode. This heating mode could be pre-configured in the main controller 410 or configured by the user, for example, the user could send it to the main controller 410 along with the command to heat the power battery pack. Specifically, the Buck-then-Boost mode means that in the first period of a cycle, the control loop forms a buck circuit (i.e., the output voltage is less than the input voltage), and in the second period of a cycle, the control loop forms a boost circuit (i.e., the output voltage is greater than the input voltage). Conversely, the Boost-then-Buck mode means that in the first period of a cycle, the control loop forms a boost circuit, and in the second period of a cycle, the control loop forms a buck circuit. In this case, the battery parameters acquired by the battery manager 420 may also include the voltage of each power battery pack. After determining the number of windings for alternating discharge based on the target high-frequency pulse current, the main controller 410 may also generate a corresponding control signal by combining the number of windings, the voltage relationship between the first power battery pack 311 and the second power battery pack 321, and the acquired heating mode, and send it to the motor controller 430 so that the motor controller 430 can control the switching module K according to the control signal. 11 ~K 16 and switch module K 21 ~K 26 This enables the voltage of the first power battery pack 311 and the second power battery pack 321 to be heated according to the corresponding number of windings in the corresponding heating mode.

[0134] According to the above implementation method, based on Figure 6 The heating control system shown is illustrated, and the specific control logic under different conditions is introduced:

[0135] When the voltage of the first power battery pack 311 is greater than the voltage of the second power battery pack 321:

[0136] In one example, if the heating mode is Buck-Boost first, the control signal generated by the main controller 410 is used to: control the switching module K in the first sub-period of the previous period of each cycle. 11 Switch module K 13 and switch module K 15 One or more of the switching modules are turned on, and all other switching modules except the one that is turned on are turned off; during the second sub-period of the period preceding each cycle, all switching modules are turned off; during the first sub-period of the period following each cycle, switching module K is controlled to turn off. 12 Switch module K 14 and switch module K 16One or more of them, and switch module K 21 Switch module K 23 and switch module K 25 One or more of the switching modules are turned on, and the other switching modules are turned off except for the ones that are turned on; in the second sub-period of the next period of each cycle, the switching module K is controlled to turn off. 21 Switch module K 23 and switch module K 25 One or more of the switching modules are turned on, and the switching modules other than the turned-on modules are turned off. The first sub-period of the previous period can refer to the on-time of the previous period, specifically represented by the product of the duration of the previous period and its corresponding duty cycle. The second sub-period of the previous period can refer to the off-time of the previous period, specifically represented by the difference between the duration of the previous period and the first sub-period of the previous period. Correspondingly, the first sub-period of the subsequent period can refer to the on-time of the subsequent period, specifically represented by the product of the duration of the subsequent period and its corresponding duty cycle. The second sub-period of the subsequent period can refer to the off-time of the subsequent period, specifically represented by the difference between the duration of the subsequent period and its first sub-period of the subsequent period. Furthermore, in this embodiment, the duration of the previous period and the duration of the subsequent period can be the same or different, and the duty cycle corresponding to the previous period and the duty cycle corresponding to the subsequent period can be the same or different; no specific limitation is imposed.

[0137] In the above example, one or more can be any one, two, or three. In the above switch control logic, switch module K is turned on during the first sub-period of the previous period. 11 Switch module K 13 and switch module K 15 There are one or more of these switching modules. There are 3 possibilities for activating one switching module, 3 possibilities for activating two switching modules, and 1 possibility for activating three switching modules. Therefore, there are a total of 7 switching control methods in the first sub-period of the previous period. Correspondingly, in the first sub-period of the next period, switching module K is activated... 12 Switch module K 14 and switch module K 16 One or more of them, and switch module K 21 Switch module K 23 and switch module K 25 One or more of the following, the on / off switch module K 12 Switch module K 14 and switch module K 16 One of the switching modules and the conducting switching module K 21 Switch module K 23 and switch module K 25There are 9 possible scenarios for a single switch module, including the conduction switch module K. 12 Switch module K 14 and switch module K 16 One of the switching modules and the conducting switching module K 21 Switch module K 23 and switch module K 25 There are 9 possible configurations for the two switch modules in the circuit, with switch module K being turned on. 12 Switch module K 14 and switch module K 16 One of the switching modules and the conducting switching module K 21 Switch module K 23 and switch module K 25 There are three possibilities for the three switch modules in the middle, with switch module K being turned on. 12 Switch module K 14 and switch module K 16 Two switching modules in the middle, and the switching module K is turned on. 21 Switch module K 23 and switch module K 25 There are 9 possible scenarios for a single switch module, including the conduction switch module K. 12 Switch module K 14 and switch module K 16 Two switching modules in the middle, and the switching module K is turned on. 21 Switch module K 23 and switch module K 25 There are 9 possible configurations for the two switch modules in the circuit, with switch module K being turned on. 12 Switch module K 14 and switch module K 16 Two switching modules in the middle and the switching module K is turned on. 21 Switch module K 23 and switch module K 25 There are three possibilities for the three switch modules in the middle, with switch module K being turned on. 12 Switch module K 14 and switch module K 16 The three switch modules in the middle and the conducting switch module K are connected. 21 Switch module K 23 and switch module K 25 There are three possibilities for the situation of a switch module, where switch module K is turned on. 12 Switch module K 14 and switch module K 16 The three switch modules in the middle and the conducting switch module K are connected. 21 Switch module K 23 and switch module K 25There are three possibilities for the two switch modules in the middle, with switch module K being turned on. 12 Switch module K 14 and switch module K 16 The three switch modules in the middle and the conducting switch module K are connected. 21 Switch module K 23 and switch module K 25 There is one possibility for the three switching modules in the above-mentioned heating control logic, therefore there are a total of 49 switching control methods in the first sub-period of the subsequent time period. Thus, the heating control logic has at least 7 × 49 = 343 switching control methods. It should be noted that the "at least" here refers to the number of switching modules K that are activated in the second sub-period of the subsequent time period. 21 Switch module K 23 and switch module K 25 One or more of the switching modules K that are turned on in the first sub-period of the next time period 21 Switch module K 23 and switch module K 25 One or more of them may also be different. As for how many possible differences there are, we can deduce them by referring to the above content. This application will not list them one by one.

[0138] To facilitate a clearer understanding of the heating control logic described above, the following example illustrates the specific circuit implementation of the heating control by using the same number of windings in two three-phase windings as much as possible.

[0139] In this example, assuming the preceding period of a cycle is T1 with a corresponding duty cycle of D1, and the following period of a cycle is T2 with a corresponding duty cycle of D2, then the first sub-period of the preceding period is represented as D1×T1, the second sub-period of the preceding period is represented as (1-D1)×T1, the first sub-period of the following period is represented as D2×T2, and the second sub-period of the following period is represented as (1-D2)×T2. Based on this:

[0140] Scenario 1: Heating via three windings

[0141] Assuming the main controller 410 determines that heating with three windings is used based on the target high-frequency pulse current, then Figure 7 An exemplary circuit diagram of a heating control circuit using three windings, provided in Embodiment 2 of this application, is shown, wherein:

[0142] Figure 7 Figure (A) shows the circuit diagram within the first sub-time period D1×T1 of the previous time period T1, referencing... Figure 7 As shown in (A), within the first sub-period D1×T1 of the previous time period T1, the switching module K 11Switch module K 13 and switch module K 15 The transistor in the circuit is turned on, while the transistors in other switching modules are turned off. In this situation, the power battery pack V... 01 The released electrical energy is divided into three paths, one of which passes through the switching module K. 11 The transistor flows into winding U1, and another path passes through switching module K. 13 The transistor flows into winding V1, and then through switching module K. 15 The transistor in the circuit draws energy into winding W1, thus storing energy in windings U1, V1, and W1. Afterward, the energy flows out through the second terminals of these three windings, then splits into three streams flowing into windings U2, V2, and W2, where it is stored. Finally, the energy flowing from winding U2 passes through switching module K. 21 The anti-parallel diode in the circuit outputs power, and the electrical energy flowing from winding V2 passes through the switching module K. 23 The anti-parallel diode in the circuit outputs power, and the electrical energy flowing from winding W2 passes through switching module K. 25 The current flows out from the anti-parallel diode in the middle and then flows into the power battery pack V. 02 The anode, and from the power battery pack V 02 The cathode process to the power battery pack V 01 The cathode. It can be seen that within the first sub-period D1×T1 of the previous time period T1, the power battery pack V... 01 The released electrical energy is fed into the power battery pack V through three windings in each three-phase winding. 02 It is charged, and three of the three-phase windings in each three-phase winding are also used for energy storage;

[0143] Figure 7 Figure (B) shows the circuit diagram within the second sub-time period (1-D1)×T1 of the previous time period T1, refer to... Figure 7 As shown in (B), during the second sub-period (1-D1)×T1 of the previous period T1, all transistors in the switching modules are turned off. In this case, since the three-phase windings in each three-phase winding have stored energy during the first sub-period D1×T1, when the power battery pack V... 01 After being disconnected, based on the characteristic that windings impede changes in current, in order to maintain the original direction of the current, windings U1, V1, W1, U2, V2, and W2 will release the previously stored electrical energy, which will then be transmitted via switching module K. 21 The anti-parallel diode and switching module K in the middle 23 The anti-parallel diodes and switching module K in 25 The current flows out from the anti-parallel diode in the middle and then flows into the power battery pack V. 02 The anode, and from the power battery pack V 02The cathode flows out and then passes through the switching module K. 12 The anti-parallel diode and switching module K in the middle 14 The anti-parallel diodes and switching module K in 16 The anti-parallel diodes in the circuit flow into windings U1, V1, and W1. It can be seen that within the second sub-period (1-D1)×T1 of the previous period T1, the electrical energy stored in the three windings of each three-phase winding is transferred to the power battery pack V. 02 Continue to provide power battery packs V 02 Charge;

[0144] Figure 7 The diagram shown in (C) is the circuit diagram within the first sub-time period D2×T2 of the subsequent time period T2, referencing... Figure 7 As shown in (C), within the first sub-time period D2×T2 of the subsequent time period T2, the switching module K 12 Switch module K 14 Switch module K 16 Switch module K 21 Switch module K 23 and switch module K 25 The transistor in the circuit is turned on, while the transistors in other switching modules are turned off. In this situation, the power battery pack V... 02 The released electrical energy is divided into three paths, one of which passes through the switching module K. 21 The transistor in the middle flows into the winding U2, and another path passes through the switching module K. 23 The transistor flows into winding V2, and then through switching module K. 25 The transistor in the circuit draws energy into winding W2, thus storing energy in windings U2, V2, and W2. Afterward, the energy flows out through the second terminals of these three windings, then splits into three streams flowing to windings U1, V1, and W1, where it is stored. Due to the power battery pack V... 01 The voltage is greater than the power battery pack V. 02 The voltage, therefore the switching module K 11 Switch module K 13 and switch module K 15 The electromotive force at one end of the non-series node is higher than that at one end of the series node, so the electrical energy flowing out of windings U1, V1, and W1 will not pass through the switching module K. 11 Switch module K 13 and switch module K 15 The anti-parallel diodes flow upwards as shown in the diagram, but instead flow through the switching module K. 12 Transistors and switching modules K 14 Transistor and switching module K 16 The transistor in the middle flows into the power battery pack V 02The cathode. It can be seen that within the first sub-period D2×T2 of the later time period T2, the power battery pack V... 02 The released electrical energy is stored in three windings of each three-phase winding;

[0145] Figure 7 The diagram shown in (D) is the circuit diagram within the second sub-time period (1-D2)×T2 of the subsequent time period T2, as referenced. Figure 7 As shown in (D), within the second sub-period (1-D2)×T2 of the subsequent time period T2, the switching module K 21 Switch module K 23 and switch module K 25 The transistor in the circuit is turned on, while the transistors in other switching modules are turned off. In this situation, the power battery pack V... 02 The released electrical energy is divided into three paths, which are respectively transmitted through the switching module K. 21 Switch module K 23 and switch module K 25 The transistors in the circuit flow into windings U2, V2, and W2. Furthermore, although the power battery pack V... 02 The voltage is less than the power battery pack V 01 The voltage is [not specified in the original text], but since windings U2, V2, W2, U1, V1, and W1 have stored energy during the first sub-period D2×T2, based on the characteristic of windings impeding current changes, windings U2, V2, W2, U1, V1, and W1 will release the previously stored electrical energy. The electrical energy released by the windings combines with the power battery pack V [not specified in the original text]. 02 The released electrical energy is then transmitted through the switching module K. 11 The anti-parallel diode and switching module K in the middle 13 The anti-parallel diodes and switching module K in 15 The anti-parallel diode in the middle flows into the power battery pack V 01 The anode, and from the power battery pack V 01 The cathode flows out to the power battery pack V 02 The cathode. It can be seen that within the second sub-period (1-D2)×T2 of the later time period T2, the power battery pack V... 02 The combined electrical energy stored in each three-phase winding powers the power battery pack V. 01 Charge.

[0146] Therefore, it can be concluded that during the first period T1 of a cycle, electrical energy flows from the high-voltage power battery pack V. 01 Flow to the low-voltage power battery pack V 02 The power battery pack 30 operates in Buck mode, and during the later period T2 of a cycle, electrical energy is transferred from the low-voltage power battery pack V. 02 Flow to high voltage power battery pack V01 The power battery pack 30 operates in Boost mode. It can be seen that within one cycle, the current flow direction in the power battery pack 30 changes, thereby generating a high-frequency pulse current in the power battery pack 30. This high-frequency pulse current flows through the power battery pack V. 01 and power battery pack V 02 At that time, due to the power battery pack V 01 and power battery pack V 02 The internal resistance of the battery pack generates Joule heat, which is then used to effectively heat the power battery pack V. 01 and power battery pack V 02 .

[0147] Scenario 2: Heating via two windings

[0148] Assuming the main controller 410 determines that two windings are used for heating based on the target high-frequency pulse current, then Figure 8 An exemplary circuit diagram of a heating control circuit using two windings, provided in Embodiment 2 of this application, is shown, wherein:

[0149] Figure 8 Figure (A) shows the circuit diagram within the first sub-time period D1×T1 of the previous time period T1, referencing... Figure 8 As shown in (A), within the first sub-period D1×T1 of the previous time period T1, in the switching module K 11 Switch module K 13 and switch module K 15 Select two switching modules, turn on the transistors in these two modules, and turn off the transistors in the other switching modules. For example, according to... Figure 8 As shown in (A), when the switching module K is turned on... 13 and switch module K 15 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 01 The released electrical energy is divided into two paths, one of which passes through the switching module K. 13 The transistor flows into winding V1, and another path passes through switching module K. 15 The energy flows into winding W1 through the transistor, thus storing energy in windings V1 and W1. Then, the energy is combined at the second terminals of windings V1 and W1, and then split into three streams flowing to windings U2, V2, and W2, where it is stored. The energy flowing out of winding U2 passes through switching module K. 21 The anti-parallel diode in the circuit outputs power, and the electrical energy flowing from winding V2 passes through the switching module K. 23 The anti-parallel diode in the circuit outputs power, and the electrical energy flowing from winding W2 passes through switching module K. 25The current flows out from the anti-parallel diode in the middle and then flows into the power battery pack V. 02 The anode, and from the power battery pack V 02 The cathode process to the power battery pack V 01 The cathode. It can be seen that within the first sub-period D1×T1 of the previous time period T1, the power battery pack V... 01 The released electrical energy is fed into the power battery pack V through two windings in the first three-phase winding and three windings in the second three-phase winding. 02 The device is charged, and two windings in the first three-phase winding and three windings in the second three-phase winding are also used for energy storage.

[0150] Figure 8 Figure (B) shows the circuit diagram within the second sub-time period (1-D1)×T1 of the previous time period T1, refer to... Figure 8 As shown in (B), during the second sub-period (1-D1)×T1 of the previous period T1, all transistors in the switching modules are turned off. In this case, since windings V1, W1, U2, V2, and W2 have stored energy during the first sub-period D1×T1, when the power battery pack V... 01 After being disconnected, based on the characteristic that windings impede changes in current, windings V1, W1, U2, V2, and W2 will release the previously stored electrical energy, which will then be transmitted through switching module K. 21 The anti-parallel diode and switching module K in the middle 23 The anti-parallel diodes and switching module K in 25 The anti-parallel diode in the middle flows into the power battery pack V 02 The anode, and from the power battery pack V 02 The cathode flows out and then passes through switch module K. 12 The anti-parallel diode and switching module K in the middle 14 The anti-parallel diodes and switching module K in 16 The anti-parallel diodes in the first three-phase winding flow into the first three-phase winding. It can be seen that within the second sub-period (1-D1)×T1 of the previous period T1, the electrical energy stored in the two windings of the first three-phase winding and the three windings of the second three-phase winding is transferred to the power battery pack V. 02 Continue to provide power battery packs V 02 Charge;

[0151] Figure 8 The diagram shown in (C) is the circuit diagram within the first sub-time period D2×T2 of the subsequent time period T2, referencing... Figure 8 As shown in (C), within the first sub-period D2×T2 of the subsequent time period T2, in the switching module K 12 Switch module K 14 and switch module K 16Select two switch modules, and in switch module K 21 Switch module K 23 and switch module K 25 Select two switching modules to turn on the transistors in these four switching modules, and turn off the transistors in the other switching modules. For example, according to... Figure 8 As shown in (C), when the switching module K is turned on... 12 Switch module K 16 Switch module K 23 and switch module K 25 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 02 The released electrical energy is divided into two paths, one of which passes through the switching module K. 23 The transistor in the middle flows into the winding V2, and another path passes through the switching module K. 25 The energy flows into winding W2 through the transistor, thus storing energy in windings V2 and W2. Then, the energy flows through the second terminals of windings V2 and W2 to windings U1 and W1, where it is stored. The energy flowing out of winding U1 passes through switching module K. 12 The electrical energy flowing out of the transistor and winding W1 passes through the switching module K. 16 The current flows out from the transistor and then into the power battery pack V. 02 The cathode. It can be seen that within the first sub-period D2×T2 of the later time period T2, the power battery pack V... 02 The released electrical energy is stored in two of the three-phase windings;

[0152] Figure 8 The diagram shown in (D) is the circuit diagram within the second sub-time period (1-D2)×T2 of the subsequent time period T2, as referenced. Figure 8 As shown in (D), within the second sub-period (1-D2)×T2 of the subsequent time period T2, in the switching module K 21 Switch module K 23 and switch module K 25 Select the two switching modules that are the same as those selected in the first sub-time period D2×T2, turn on the transistors in these two switching modules, and turn off the transistors in the other switching modules. For example, refer to Figure 8 As shown in (D), when the switching module K is turned on... 23 and switch module K 25 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 02 The released electrical energy is divided into two paths, which pass through the switching module K respectively. 23 and switch module K 25The transistors in the circuit flow into windings V2 and W2. Then, combining the previously stored electrical energy released from windings V2 and W2, and windings U1 and W1, the energy is transmitted via switching module K. 11 The anti-parallel diode and switching module K in the middle 13 The anti-parallel diodes and switching module K in 15 The anti-parallel diode in the middle flows into the power battery pack V 01 The anode, and from the power battery pack V 01 The cathode flows out to the power battery pack V 02 The cathode. It can be seen that within the second sub-period (1-D2)×T2 of the later time period T2, the power battery pack V... 02 The combined electrical energy stored in the two windings of each three-phase winding powers the power battery pack V. 01 Charge.

[0153] Therefore, the above implementation method can achieve alternating discharge between the two power battery packs by using two of the three-phase windings as much as possible. This helps to reduce the operating frequency of the windings while generating high-frequency pulse current to heat the power battery pack, thus extending the life of the motor as much as possible.

[0154] It should be understood that the above Figure 8 This is merely an illustrative description of one possible switching control method for heating via two windings. In this embodiment, since the previous time period T1 can select to turn on the switching module K... 11 Switch module K 13 and switch module K 15 For any two of them, that is, in the previous time period T1, there are a total of 3 possible switching control methods, namely: switching module K 11 and switch module K 13 Or switch module K 11 and switch module K 15 Or switch module K 13 and switch module K 15 The next time period can select the on / off switch module K. 12 Switch module K 14 and switch module K 16 Any two of them and the switch module K 21 Switch module K 23 and switch module K 25 For any two of them, that is, the later time period T2, there are a total of 9 possible switching control methods, namely: switching module K 12 Switch module K 14 Switch module K 21 and switch module K 23 Or switch module K 12 Switch module K 14Switch module K 21 and switch module K 25 Or switch module K 12 Switch module K 14 Switch module K 23 and switch module K 25 Or switch module K 12 Switch module K 16 Switch module K 21 and switch module K 23 Or switch module K 12 Switch module K 16 Switch module K 21 and switch module K 25 Or switch module K 12 Switch module K 16 Switch module K 23 and switch module K 25 Or switch module K 14 Switch module K 16 Switch module K 21 and switch module K 23 Or switch module K 14 Switch module K 16 Switch module K 21 and switch module K 25 Or switch module K 14 Switch module K 16 Switch module K 23 and switch module K 25 Thus, when heating is achieved through two windings, combined with the three switching control methods in the first time period and the nine switching control methods in the second time period, there are a total of 3 × 9 = 27 switching control methods in one cycle. The main controller 410 can randomly or according to a certain rule select one of these 27 switching control methods to perform heating control under the two windings. This application embodiment does not specifically limit this.

[0155] Scenario 3: Heating through a single winding

[0156] Assuming the main controller 410 determines that a single winding should be used for heating based on the target high-frequency pulse current, then Figure 9 An exemplary circuit diagram of a heating control circuit via a winding, provided in Embodiment 2 of this application, is shown, wherein:

[0157] Figure 9 Figure (A) shows the circuit diagram within the first sub-time period D1×T1 of the previous time period T1, referencing... Figure 9 As shown in (A), within the first sub-period D1×T1 of the previous time period T1, in the switching module K 11Switch module K 13 and switch module K 15 Select one switching module, turn on the transistor in that switching module, and turn off the transistors in the other switching modules. For example, according to... Figure 9 As shown in (A), when the switching module K is turned on... 15 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 01 The released electrical energy passes through the switching module K 15 The electrical energy flows into winding W1 through the transistor, thus storing energy in winding W1. Then, the electrical energy flows through the second terminal of winding W1 to windings U2, V2, and W2, thus storing energy in windings U2, V2, and W2. Furthermore, the electrical energy flowing out of winding U2 passes through switching module K. 21 The anti-parallel diode in the circuit outputs power, and the electrical energy flowing from winding V2 passes through the switching module K. 23 The anti-parallel diode in the circuit outputs power, and the electrical energy flowing from winding W2 passes through switching module K. 25 The current flows out from the anti-parallel diode in the middle and then flows into the power battery pack V. 02 The anode, and from the power battery pack V 02 The cathode process to the power battery pack V 01 The cathode. It can be seen that within the first sub-period D1×T1 of the previous time period T1, the power battery pack V... 01 The released electrical energy is fed into the power battery pack V through one winding of the first three-phase winding and three windings of the second three-phase winding. 02 The device is charged, and one winding of the first three-phase winding and three windings of the second three-phase winding are also used for energy storage.

[0158] Figure 9 Figure (B) shows the circuit diagram within the second sub-time period (1-D1)×T1 of the previous time period T1, refer to... Figure 9 As shown in (B), during the second sub-period (1-D1)×T1 of the previous period T1, all transistors in the switching modules are turned off. In this case, since windings W1, U2, V2, and W2 have stored energy during the first sub-period D1×T1, based on the characteristic that windings impede current changes, windings W1, U2, V2, and W2 will release the previously stored electrical energy, which will then be released through switching module K. 21 The anti-parallel diode and switching module K in the middle 23 The anti-parallel diodes and switching module K in 25 The anti-parallel diode in the middle flows into the power battery pack V 02 The anode, and from the power battery pack V 02 The cathode flows out and then passes through switch module K. 12The anti-parallel diode and switching module K in the middle 14 The anti-parallel diodes and switching module K in 16 The anti-parallel diode in the circuit flows to the first three-phase winding. It can be seen that within the second sub-period (1-D1)×T1 of the previous period T1, the electrical energy stored in one winding of the first three-phase winding and the three windings of the second three-phase winding is transferred to the power battery pack V. 02 Continue to provide power battery packs V 02 Charge;

[0159] Figure 9 The diagram shown in (C) is the circuit diagram within the first sub-time period D2×T2 of the subsequent time period T2, referencing... Figure 9 As shown in (C), within the first sub-period D2×T2 of the subsequent time period T2, in the switching module K 12 Switch module K 14 and switch module K 16 Select a switch module and in switch module K 21 Switch module K 23 and switch module K 25 Select one switching module, turn on the transistors in these two switching modules, and turn off the transistors in the other switching modules. For example, according to... Figure 9 As shown in (C), when the switching module K is turned on... 14 and switch module K 21 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 02 The released electrical energy passes through the switching module K 21 The electrical energy flows into winding U2 through the transistor, thus storing energy in winding U2. Then, the electrical energy flows through the second terminal of winding U2 to winding V1, where it is stored. Finally, the electrical energy flowing out of winding V1 passes through switching module K. 14 After the transistor flows out, it flows into the power battery pack V. 02 The cathode. It can be seen that within the first sub-period D2×T2 of the later time period T2, the power battery pack V... 02 The released electrical energy is stored in one winding of each three-phase winding;

[0160] Figure 9 The diagram shown in (D) is the circuit diagram within the second sub-time period (1-D2)×T2 of the subsequent time period T2, as referenced. Figure 9 As shown in (D), within the second sub-period (1-D2)×T2 of the subsequent time period T2, in the switching module K 21 Switch module K 23 and switch module K 25Select the same switching module selected within the first sub-time period D2×T2, turn on the transistor in that switching module, and turn off the transistors in other switching modules. For example, refer to... Figure 9 As shown in (D), when the switching module K is turned on... 21 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 02 The released electrical energy passes through the switching module K 21 The energy flows into winding U2, and then, combined with the previously stored electrical energy released from winding U2 and winding V1, it is distributed via switching module K. 11 The anti-parallel diode and switching module K in the middle 13 The anti-parallel diodes and switching module K in 15 The anti-parallel diode in the middle flows into the power battery pack V 01 The anode, and from the power battery pack V 01 The cathode flows out to the power battery pack V 02 The cathode. It can be seen that within the second sub-period (1-D2)×T2 of the later time period T2, the power battery pack V... 02 The electrical energy stored in one winding of each three-phase winding is combined to form the power battery pack V. 01 Charge.

[0161] Therefore, the above implementation method can achieve alternating discharge between the two power battery packs by using one winding in each three-phase winding as much as possible. This helps to further reduce the operating frequency of the windings and extend the life of the motor while generating high-frequency pulse current to heat the power battery pack.

[0162] It should be understood that the above Figure 9 This is merely an illustrative description of one possible switching control method for heating via two windings. In this embodiment, since the previous time period T1 can select to turn on the switching module K... 11 Switch module K 13 and switch module K 15 For any one of them, that is, in the previous time period T1, there are 3 possible switching control methods, namely: switching module K 11 Or switch module K 13 Or switch module K 15 The next time period can select the on / off switch module K. 12 Switch module K 14 and switch module K 16 Any one of them and the switch module K 21 Switch module K 23 and switch module K 25 For any one of them, that is, in the next time period T2, there are a total of 9 possible switching control methods, namely: switching module K 12and switch module K 21 Or switch module K 12 and switch module K 23 Or switch module K 12 and switch module K 25 Or switch module K 14 and switch module K 21 Or switch module K 14 and switch module K 23 Or switch module K 14 and switch module K 25 Or switch module K 16 and switch module K 21 Or switch module K 16 and switch module K 23 Or switch module K 16 and switch module K 25 Thus, when heating is performed through one winding, combined with the three switching control methods in the first time period and the nine switching control methods in the second time period, there are a total of 3 × 9 = 27 switching control methods in one cycle. The main controller 410 can randomly or according to a certain rule select one of these 27 switching control methods to perform heating control under one winding. This application embodiment does not specifically limit this.

[0163] Furthermore, it should be noted that scenarios one through three described above are merely examples of specific switching control methods implemented by controlling the two three-phase windings to use the same number of windings for heating. In actual operation, the main controller can control the two three-phase windings to use the same or different numbers of windings for heating, for example, by controlling the switching module K in the first switching module. 11 ~K 16 When any number of the three windings of the first three-phase winding are selected, the switching module K in the second switching module can be controlled. 21 ~K 26 Select any number of the three windings of the second and third phase windings, such as selecting three, two, or one winding of the three windings of the second and third phase windings. In this embodiment, there are no fewer than 343 possible switching control methods. The main controller can select any one of these 343 switching control methods to perform heating control, so as to use different winding combinations for heating. By changing the number of winding combinations, the adjustable range of the high-frequency pulse current used for heating in the power battery pack device can be effectively improved. It should be understood that the scheme of selecting different numbers of windings for heating can be directly derived from the schemes of Situations 1 to 3 above, without any creative effort. Therefore, this embodiment will not list them one by one.

[0164] In another example, if the heating mode is Boost followed by Buck, the control signal generated by the main controller 410 is used to: control the switching module K in the first sub-period of the previous period in each cycle. 12 Switch module K 14 and switch module K 16 One or more of them, and switch module K 21 Switch module K 23 and switch module K 25 One or more of the switching modules are turned on, and the other switching modules are turned off except for the ones that are turned on; in the second sub-period of the previous period of each cycle, the switching module K is controlled to turn off. 21 Switch module K 23 and switch module K 25 One or more of the switching modules are turned on, and the other switching modules are turned off except for the ones that are turned on; in the first sub-period of the next period of each cycle, the switching module K is controlled to turn off. 11 Switch module K 13 and switch module K 15 One or more of the switching modules are turned on, and all other switching modules are turned off except for the ones that are turned on; in the second sub-period of the next period of each cycle, all switching modules are turned off. In other words, compared with the control method corresponding to the Buck-then-Boost mode, the first period of the Boost-then-Buck mode adopts the control method of the second period of the Buck-then-Boost mode, and the second period of the Boost-then-Buck mode adopts the control method of the first period of the Buck-then-Boost mode. For the specific control implementation logic, please refer directly to the above. Figures 7 to 9 The embodiments of this application will not be repeated in detail.

[0165] In addition, similar to the Buck-then-Boost mode, when the voltage of the first power battery pack 311 is greater than the voltage of the second power battery pack 321, the Buck-then-Boost mode also has no fewer than 343 switching control methods. The main controller can select any of these 343 switching control methods to execute the heating control in the Buck-then-Boost mode, so as to use different winding combinations for heating. By changing the number of winding combinations, the adjustable range of the high-frequency pulse current used for heating in the power battery pack device can be effectively improved.

[0166] When the voltage of the first power battery pack 311 is less than the voltage of the second power battery pack 321:

[0167] In one example, if the heating mode is Boost followed by Buck, the control signal generated by the main controller 410 is used to: control the switching module K in the first sub-period of the preceding period in each cycle. 11 Switch module K 13 and switch module K 15 One or more of them, and switch module K 22 Switch module K 24 and switch module K 26 One or more corresponding switches in the circuit are turned on, and the other switches are turned off except for the ones that are turned on; in the second sub-period of the period preceding each cycle, the switch module K is controlled to turn off. 11 Switch module K 13 and switch module K 15 One or more of the switching modules are turned on, and the other switching modules are turned off except for the ones that are turned on; in the first sub-period of the next period of each cycle, the switching module K is controlled to turn off. 21 Switch module K 23 and switch module K 25 One or more of the switching modules are turned on, and the other switching modules are turned off except for the ones that are turned on; in the second sub-period of the next period of each cycle, all switching modules are turned off.

[0168] In the above example, one or more can be any one, two, or three. In the above switch control logic, switch module K is turned on during the first sub-period of the previous period. 11 Switch module K 13 and switch module K 15 One or more of them, and switch module K 22 Switch module K 24 and switch module K 26 One or more of the following, the on / off switch module K 11 Switch module K 13 and switch module K 15 One of the switching modules and the conducting switching module K 22 Switch module K 24 and switch module K 26 There are 9 possible scenarios for a single switch module, including the conduction switch module K. 11 Switch module K 13 and switch module K 15 One of the switching modules and the conducting switching module K 22 Switch module K 24 and switch module K 26 There are 9 possible configurations for the two switch modules in the circuit, with switch module K being turned on. 11 Switch module K13 and switch module K 15 One of the switching modules and the conducting switching module K 22 Switch module K 24 and switch module K 26 There are three possibilities for the three switch modules in the middle, with switch module K being turned on. 11 Switch module K 13 and switch module K 15 Two switching modules in the middle and the switching module K is turned on. 22 Switch module K 24 and switch module K 26 There are 9 possible scenarios for a single switch module, including the conduction switch module K. 11 Switch module K 13 and switch module K 15 Two switching modules in the middle and the switching module K is turned on. 22 Switch module K 24 and switch module K 26 There are 9 possible configurations for the two switch modules in the circuit, with switch module K being turned on. 11 Switch module K 13 and switch module K 15 Two switching modules in the middle and the switching module K is turned on. 22 Switch module K 24 and switch module K 26 There are three possibilities for the three switch modules in the middle, with switch module K being turned on. 11 Switch module K 13 and switch module K 15 The three switch modules in the middle and the conducting switch module K are connected. 22 Switch module K 24 and switch module K 26 There are three possibilities for the situation of a switch module, where switch module K is turned on. 11 Switch module K 13 and switch module K 15 The three switch modules in the middle and the conducting switch module K are connected. 22 Switch module K 24 and switch module K 26 There are three possibilities for the two switch modules in the middle, with switch module K being turned on. 11 Switch module K 13 and switch module K 15 The three switch modules in the middle and the conducting switch module K are connected. 22 Switch module K 24 and switch module K 26There is only one possibility for the three switching modules in the previous time period, therefore there are a total of 49 switching control methods in the first sub-time period of the previous time period. Correspondingly, in the first sub-time period of the next time period, the switching module K is turned on. 21 Switch module K 23 and switch module K 25 There are 3 possibilities for activating one switch module, 3 possibilities for activating two switch modules, and 1 possibility for activating three switch modules. Therefore, there are a total of 7 switching control methods in the first sub-period of the previous period. It can be seen that the above heating control logic has no fewer than 49 × 7 = 343 switching control methods. It should be noted that the "no fewer than" here refers to the number of switch modules K activated in the second sub-period of the previous period. 11 Switch module K 13 and switch module K 15 One or more of the switching modules K that were turned on in the first sub-period of the previous period. 11 Switch module K 13 and switch module K 15 One or more of them may also be different. As for how many possible differences there are, we can deduce them by referring to the above content. This application will not list them one by one.

[0169] To facilitate a clearer understanding of the heating control logic described above, the following example illustrates the specific circuit implementation of the heating control by using the same number of windings in two three-phase windings as much as possible.

[0170] In this example, assuming the first sub-period of the previous period is represented as D1×T1, the second sub-period of the previous period is represented as (1-D1)×T1, the first sub-period of the next period is represented as D2×T2, and the second sub-period of the next period is represented as (1-D2)×T2, then:

[0171] Scenario 1: Heating via three windings

[0172] Assuming the main controller 410 determines that heating with three windings is used based on the target high-frequency pulse current, then Figure 10 An exemplary circuit diagram of another heating control circuit using three windings provided in Embodiment 2 of this application is shown, wherein:

[0173] Figure 10 Figure (A) shows the circuit diagram within the first sub-time period D1×T1 of the previous time period T1, referencing... Figure 10 As shown in (A), within the first sub-period D1×T1 of the previous time period T1, the switching module K 11 Switch module K 13 Switch module K 15Switch module K 22 Switch module K 24 and switch module K 26 The transistor in the circuit is turned on, while the transistors in other switching modules are turned off. In this situation, the power battery pack V... 01 The released electrical energy is divided into three paths, one of which passes through the switching module K. 11 The transistor flows into winding U1, and another path passes through switching module K. 13 The transistor flows into winding V1, and then through switching module K. 15 The energy flows into winding W1 through the transistor, thus storing energy in windings U1, V1, and W1. Then, the energy flows through the second terminals of these three windings to windings U2, V2, and W2, where it is stored. Finally, the energy flowing out of winding U2 passes through switching module K. 22 The electrical energy flowing out from the transistor in the circuit, originating from winding V2, passes through the switching module K. 24 The electrical energy flowing out from the transistor in the circuit, and flowing from the winding W2, passes through the switching module K. 26 The current flows out of the transistor and then into the power battery pack V. 01 The cathode. It can be seen that within the first sub-period D1×T1 of the previous time period T1, the power battery pack V... 01 The released electrical energy is stored in three windings of each three-phase winding;

[0174] Figure 10 Figure (B) shows the circuit diagram within the second sub-time period (1-D1)×T1 of the previous time period T1, refer to... Figure 10 As shown in (B), within the second sub-period (1-D1)×T1 of the previous time period T1, the switching module K 11 Switch module K 13 and switch module K 15 The transistor in the circuit is turned on, while the transistors in other switching modules are turned off. In this situation, the power battery pack V... 01 The released electrical energy is divided into three paths, one of which passes through the switching module K. 11 The transistor flows into winding U1, and another path passes through switching module K. 13 The transistor flows into winding V1, and then through switching module K. 15 The transistor in the circuit flows into winding W1. Furthermore, although the power battery pack V... 01 The voltage is less than the power battery pack V 02The voltage is [not specified in the original text], but since windings U1, V1, W1, U2, V2, and W2 have stored energy during the first sub-period D1×T1, in order to maintain the original direction of the current, windings U1, V1, W1, U2, V2, and W2 will release the previously stored electrical energy. The electrical energy released by the windings combines with the power battery pack V [not specified in the original text]. 01 The released electrical energy is then transmitted through the switching module K. 21 The anti-parallel diode and switching module K in the middle 23 The anti-parallel diodes and switching module K in 25 The anti-parallel diode in the middle flows into the power battery pack V 02 The anode, and from the power battery pack V 02 The cathode flows out to the power battery pack V 01 The cathode. It can be seen that within the second sub-period (1-D1)×T1 of the previous period T1, the power battery pack V... 01 The combined electrical energy stored in the three windings of each three-phase winding powers the power battery pack V. 02 Charge;

[0175] Figure 10 The diagram shown in (C) is the circuit diagram within the first sub-time period D2×T2 of the subsequent time period T2, referencing... Figure 10 As shown in (C), within the first sub-time period D2×T2 of the subsequent time period T2, the switching module K 21 Switch module K 23 and switch module K 25 The transistor in the circuit is turned on, while the transistors in other switching modules are turned off. In this situation, the power battery pack V... 02 The released electrical energy is divided into three paths, one of which passes through the switching module K. 21 The transistor in the middle flows into the winding U2, and another path passes through the switching module K. 23 The transistor flows into winding V2, and then through switching module K. 25 The energy flows into winding W2 through the transistor, thus storing energy in windings U2, V2, and W2. Then, the energy flows through the second terminals of these three windings to windings U1, V1, and W1, where it is stored. Finally, the energy flowing out of winding U1 passes through switching module K. 11 The anti-parallel diode flows out, and the electrical energy flowing out of winding V1 passes through the switching module K. 13 The anti-parallel diode flows out, and the electrical energy flowing out of winding W1 passes through the switching module K. 15 The anti-parallel diode flows out, and then flows into the power battery pack V. 01 The anode of the power battery pack V 01 The cathode flows to the power battery pack V 02The cathode. It can be seen that within the first sub-period D2×T2 of the later time period T2, the power battery pack V... 02 The released electrical energy is the power battery pack V. 01 Charging, and energy storage is carried out in the three windings of each three-phase winding;

[0176] Figure 10 The diagram shown in (D) is the circuit diagram within the second sub-time period (1-D2)×T2 of the subsequent time period T2, as referenced. Figure 10 As shown in (D), during the second sub-period (1-D2)×T2 of the subsequent time period T2, all transistors in the switching modules are turned off. In this case, since windings U1, V1, W1, U2, V2, and W2 have stored energy during the first sub-period D2×T2, in order to maintain the original direction of the current, windings U2, V2, W2, U1, V1, and W1 will release the previously stored electrical energy, which will then flow through switching module K respectively. 11 The anti-parallel diode and switching module K in the middle 13 The anti-parallel diodes and switching module K in 15 The anti-parallel diode in the middle flows into the power battery pack V 01 The anode, and from the power battery pack V 01 The cathode flows out and passes through the switching module K. 22 The anti-parallel diode and switching module K in the middle 24 The anti-parallel diodes and switching module K in 26 The anti-parallel diodes in the circuit flow into windings U2, V2, and W2. Therefore, within the second sub-period (1-D2)×T2 of the subsequent time period T2, the electrical energy stored in the three windings of each three-phase winding is transferred to the power battery pack V. 01 Continue to provide power battery packs V 01 Charge.

[0177] Therefore, it can be seen that during the first period T1 of a cycle, electrical energy flows from the low-voltage power battery pack V. 01 Flow to high voltage power battery pack V 02 The power battery pack 30 operates in Boost mode, and during the later period T2 of a cycle, electrical energy is drawn from the high-voltage power battery pack V. 02 Flow to the low-voltage power battery pack V 01 The power battery pack 30 operates in Buck mode. It can be seen that within one cycle, the current flow direction in the power battery pack 30 changes, thereby generating a high-frequency pulse current in the power battery pack 30. This high-frequency pulse current flows through the power battery pack V. 01 and power battery pack V 02 At that time, due to the power battery pack V 01and power battery pack V 02 The internal resistance of the battery pack generates Joule heat, which is then used to effectively heat the power battery pack V. 01 and power battery pack V 02 .

[0178] Scenario 2: Heating via two windings

[0179] Assuming the main controller 410 determines that two windings are used for heating based on the target high-frequency pulse current, then Figure 11 An exemplary circuit diagram of another heating control circuit using two windings provided in Embodiment 2 of this application is shown, wherein:

[0180] Figure 11 Figure (A) shows the circuit diagram within the first sub-time period D1×T1 of the previous time period T1, referencing... Figure 11 As shown in (A), within the first sub-period D1×T1 of the previous time period T1, in the switching module K 11 Switch module K 13 and switch module K 15 Select two switch modules, in switch module K 22 Switch module K 24 and switch module K 26 Select two switching modules to turn on the transistors in these four switching modules and turn off the transistors in the other switching modules. For example, according to... Figure 11 As shown in (A), when the switching module K is turned on... 11 Switch module K 13 Switch module K 22 and switch module K 26 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 01 The released electrical energy is divided into two paths, one of which passes through the switching module K. 11 The transistor flows into winding U1, and another path passes through switching module K. 13 The energy flows into winding V1 through the transistor, thus storing energy in windings U1 and V1. Then, the energy flows through the second terminals of windings U1 and V1 to windings U2 and W2, where it is stored. Finally, the energy flowing out of winding U2 passes through switching module K. 22 The electrical energy flowing out from the transistor in the circuit, and flowing from the winding W2, passes through the switching module K. 26 The current flows out of the transistor and then into the power battery pack V. 01 The cathode. It can be seen that within the first sub-period D1×T1 of the previous time period T1, the power battery pack V... 01 The released electrical energy is stored in two of the three-phase windings;

[0181] Figure 11 Figure (B) shows the circuit diagram within the second sub-time period (1-D1)×T1 of the previous time period T1, refer to... Figure 11 As shown in (B), within the second sub-period (1-D1)×T1 of the previous time period T1, in the switching module K 11 Switch module K 13 and switch module K 15 Select two switching modules that are the same as the first sub-time period D1×T1, turn on the transistors in these two switching modules, and turn off the transistors in the other switching modules. For example, referring to 11(B), when switching module K is turned on... 11 and switch module K 13 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 01 The released electrical energy is divided into two paths, one of which passes through the switching module K. 11 The transistor flows into winding U1, and another path passes through switching module K. 13 The transistor in the middle flows into the winding V1. Furthermore, although the power battery pack V... 01 The voltage is less than the power battery pack V 02 The voltage is [not specified in the original text], but since windings U1, V1, U2, and W2 have stored energy during the first sub-period D1×T1, in order to maintain the original direction of the current, windings U1, V1, U2, and W2 will release the previously stored electrical energy. The electrical energy released by the windings combines with the power battery pack V [not specified in the original text]. 01 The released electrical energy is then transmitted through the switching module K. 21 The anti-parallel diode and switching module K in the middle 23 The anti-parallel diodes and switching module K in 25 The anti-parallel diode in the middle flows into the power battery pack V 02 The anode, and from the power battery pack V 02 The cathode flows out to the power battery pack V 01 The cathode. It can be seen that within the second sub-period (1-D1)×T1 of the previous period T1, the power battery pack V... 01 The combined electrical energy stored in the two windings of each three-phase winding powers the power battery pack V. 02 Charge;

[0182] Figure 11 The diagram shown in (C) is the circuit diagram within the first sub-time period D2×T2 of the subsequent time period T2, referencing... Figure 11 As shown in (C), within the first sub-period D2×T2 of the subsequent time period T2, in the switching module K 21 Switch module K 23 and switch module K 25Select two switching modules, turn on the transistors in these two modules, and turn off the transistors in the other switching modules. For example, according to... Figure 11 As shown in (C), when the switching module K is turned on... 23 and switch module K 25 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 02 The released electrical energy is divided into two paths, one of which passes through the switching module K. 23 The transistor in the middle flows into the winding V2, and another path passes through the switching module K. 25 The energy flows into winding W2 through the transistor, thus storing energy in windings V2 and W2. Then, the energy flows through the second terminals of windings V2 and W2 to windings U1, V1, and W1, where it is stored. Finally, the energy flowing out of winding U1 passes through switching module K. 11 The anti-parallel diode flows out, and the electrical energy flowing out of winding V1 passes through the switching module K. 13 The anti-parallel diode flows out, and the electrical energy flowing out of winding W1 passes through the switching module K. 15 The anti-parallel diode flows out, and then flows into the power battery pack V. 01 The anode of the power battery pack V 01 The cathode flows to the power battery pack V 02 The cathode. It can be seen that within the first sub-period D2×T2 of the later time period T2, the power battery pack V... 02 The released electrical energy is fed into the power battery pack V through two windings in the second three-phase winding and three windings in the first three-phase winding. 01 The device is charged, and two windings in the second three-phase winding and three windings in the first three-phase winding are used for energy storage.

[0183] Figure 11 The diagram shown in (D) is the circuit diagram within the second sub-time period (1-D2)×T2 of the subsequent time period T2, as referenced. Figure 11 As shown in (D), during the second sub-period (1-D2)×T2 of the subsequent time period T2, all transistors in the switching modules are turned off. In this case, since windings U1, V1, W1, V2, and W2 have stored energy during the first sub-period D2×T2, in order to maintain the original direction of the current, windings V2, W2, U1, V1, and W1 will release the previously stored energy, which will then flow through switching module K respectively. 11 The anti-parallel diode and switching module K in the middle 13 The anti-parallel diodes and switching module K in 15 The anti-parallel diode in the middle flows into the power battery pack V 01 The anode, and from the power battery pack V 01The cathode flows out and then passes through switch module K. 22 The anti-parallel diode and switching module K in the middle 24 The anti-parallel diodes and switching module K in 26 The anti-parallel diodes in the first three-phase winding flow into the second three-phase winding. It can be seen that within the second sub-period (1-D2)×T2 of the subsequent time period T2, the electrical energy stored in two windings of the second three-phase winding and three windings of the first three-phase winding is transferred to the power battery pack V. 01 Continue to provide power battery packs V 01 Charge.

[0184] Therefore, the above implementation method can achieve alternating discharge between the two power battery packs by using two windings in each three-phase winding. This helps to reduce the operating frequency of the windings while generating high-frequency pulse current to heat the power battery pack, thus extending the life of the motor as much as possible.

[0185] It should be understood that the above Figure 11 This is merely an illustrative description of one possible switching control method for heating via two windings. In this embodiment, since the previous time period T1 can select to turn on the switching module K... 11 Switch module K 13 and switch module K 15 Any two of them and the switch module K 22 Switch module K 24 and switch module K 26 For any two of them, that is, in the previous time period T1, there are a total of 9 possible switching control methods, namely: switching module K 11 Switch module K 13 Switch module K 22 and switch module K 24 Or switch module K 11 Switch module K 13 Switch module K 22 and switch module K 26 Or switch module K 11 Switch module K 13 Switch module K 24 and switch module K 26 Or switch module K 11 Switch module K 15 Switch module K 22 and switch module K 24 Or switch module K 11 Switch module K 15 Switch module K 22 and switch module K 26 Or switch module K 11 Switch module K 15Switch module K 24 and switch module K 26 Or switch module K 13 Switch module K 15 Switch module K 22 and switch module K 24 Or switch module K 13 Switch module K 15 Switch module K 22 and switch module K 26 Or switch module K 13 Switch module K 15 Switch module K 24 and switch module K 26 The next time period can select the on / off switch module K. 21 Switch module K 23 and switch module K 25 For any two of them, that is, the later time period T2, there are 3 possible switching control methods, namely: switching module K 21 and switch module K 23 Or switch module K 21 and switch module K 25 Or switch module K 23 and switch module K 25 Thus, when heating is achieved through two windings, combined with the nine switching control methods in the first time period and the three switching control methods in the second time period, there are a total of 9 × 3 = 27 switching control methods in one cycle. The main controller 410 can randomly or according to a certain rule select one of these 27 switching control methods to perform heating control for the two windings. This application embodiment does not specifically limit this.

[0186] Scenario 3: Heating through a single winding

[0187] Assuming the main controller 410 determines that a single winding should be used for heating based on the target high-frequency pulse current, then Figure 12 An exemplary circuit diagram of another heating control circuit via a winding, provided in Embodiment 2 of this application, is shown, wherein:

[0188] Figure 12 Figure (A) shows the circuit diagram within the first sub-time period D1×T1 of the previous time period T1, referencing... Figure 12 As shown in (A), within the first sub-period D1×T1 of the previous time period T1, in the switching module K 11 Switch module K 13 and switch module K 15 Select a switch module, in switch module K 22 Switch module K 24 and switch module K26 Select one corresponding switching module, turn on the transistors in those two switching modules, and turn off the transistors in the other switching modules. For example, according to... Figure 12 As shown in (A), when the switching module K is turned on... 13 and switch module K 24 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 01 The released electrical energy passes through the switching module K 13 The electrical energy flows into winding V1 through the transistor, thus storing energy in winding V1. Then, the electrical energy flows through the second end of winding V1 to winding V2, where it is stored. Finally, the electrical energy flowing out of winding V2 passes through switching module K. 24 The current flows out of the transistor and then into the power battery pack V. 01 The cathode. It can be seen that within the first sub-period D1×T1 of the previous time period T1, the power battery pack V... 01 The released electrical energy is stored in one winding of each three-phase winding;

[0189] Figure 12 Figure (B) shows the circuit diagram within the second sub-time period (1-D1)×T1 of the previous time period T1, refer to... Figure 12 As shown in (B), within the second sub-period (1-D1)×T1 of the previous time period T1, in the switching module K 11 Switch module K 13 and switch module K 15 Select a switching module that is identical to the first sub-time period D1×T1, turn on the transistor in that switching module, and turn off the transistors in the other switching modules. For example, refer to... Figure 12 As shown in (B), when the switching module K is turned on... 13 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 01 The released electrical energy passes through the switching module K 13 The transistor in the circuit flows into winding V1. Furthermore, windings V1 and V2 have stored energy during the first sub-period D1×T1. Therefore, to maintain the original direction of the current, windings V1 and V2 will release the previously stored energy. The energy released by the windings combines with the energy from the power battery pack V... 01 The released electrical energy is then transmitted through the switching module K. 21 The anti-parallel diode and switching module K in the middle 23 The anti-parallel diodes and switching module K in 25 The anti-parallel diode in the middle flows into the power battery pack V 02 The anode, and from the power battery pack V 02 The cathode flows out to the power battery pack V 01The cathode. It can be seen that within the second sub-period (1-D1)×T1 of the previous period T1, the power battery pack V... 01 The combined electrical energy stored in one winding of each three-phase winding powers the V power battery pack. 02 Charge;

[0190] Figure 12 The diagram shown in (C) is the circuit diagram within the first sub-time period D2×T2 of the subsequent time period T2, referencing... Figure 12 As shown in (C), within the first sub-period D2×T2 of the subsequent time period T2, in the switching module K 21 Switch module K 23 and switch module K 25 Select one switching module, turn on the transistor in that switching module, and turn off the transistors in the other switching modules. For example, according to... Figure 12 As shown in (C), when the switching module K is turned on... 25 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 02 The released electrical energy passes through the switching module K 25 The electrical energy flows into winding W2 through the transistor, thus storing energy in winding W2. Then, the electrical energy flows through the second end of winding W2 to windings U1, V1, and W1, thus storing energy in windings U1, V1, and W1. Finally, the electrical energy flowing out of winding U1 passes through switching module K. 11 The anti-parallel diode flows out, and the electrical energy flowing out of winding V1 passes through the switching module K. 13 The anti-parallel diode flows out, and the electrical energy flowing out of winding W1 passes through the switching module K. 15 The anti-parallel diode flows out, and then flows into the power battery pack V. 01 The anode of the power battery pack V 01 The cathode flows to the power battery pack V 02 The cathode. It can be seen that within the first sub-period D2×T2 of the later time period T2, the power battery pack V... 02 The released electrical energy is fed into the power battery pack V through one winding of the second three-phase winding and three windings of the first three-phase winding. 01 Charging, and one winding of the second three-phase winding and three windings of the first three-phase winding were used for energy storage;

[0191] Figure 12 The diagram shown in (D) is the circuit diagram within the second sub-time period (1-D2)×T2 of the subsequent time period T2, as referenced. Figure 12As shown in (D), during the second sub-period (1-D2)×T2 of the subsequent time period T2, all transistors in the switching modules are turned off. In this case, since windings W2, U1, V1, and W1 have stored energy during the first sub-period D2×T2, in order to maintain the original direction of the current, windings W2, U1, V1, and W1 will release the previously stored electrical energy, which will then flow through switching module K respectively. 11 The anti-parallel diode and switching module K in the middle 13 The anti-parallel diodes and switching module K in 15 The anti-parallel diode in the middle flows into the power battery pack V 01 The anode, and from the power battery pack V 01 The cathode flows out to the second and third phase windings. It can be seen that, within the second sub-period (1-D2)×T2 of the subsequent time period T2, the electrical energy stored in one winding of the second and third phase windings and three windings of the first and third phase windings is transferred to the power battery pack V. 01 Continue to provide power battery packs V 01 Charge.

[0192] Therefore, the above implementation method can achieve alternating discharge between two power battery packs through one winding of each three-phase winding, which helps to further reduce the operating frequency of the windings and further extend the life of the motor while generating high-frequency pulse current to heat the power battery pack.

[0193] It should be understood that the above Figure 12 This is merely an illustrative description of one possible switching control method for heating via a single winding. In this embodiment, since the previous time period T1 can select to turn on the switching module K... 11 Switch module K 13 and switch module K 15 Any one of them, and switch module K 22 Switch module K 24 and switch module K 26 For any one of them, that is, in the previous time period T1, there are a total of 9 possible switching control methods, namely: switching module K 11 and switch module K 22 Or switch module K 11 and switch module K 24 Or switch module K 11 and switch module K 26 Or switch module K 13 and switch module K 22 Or switch module K 13 and switch module K 24 Or switch module K 13 and switch module K 26 Or switch module K15 and switch module K 22 Or switch module K 15 and switch module K 24 Or switch module K 15 and switch module K 26 The next time period can select the on / off switch module K. 21 Switch module K 23 and switch module K 25 For any one of them, that is, in the next time period T2, there are 3 possible switching control methods, namely: switching module K 21 Or switch module K 23 Or switch module K 25 Thus, when heating is performed through one winding, combined with the 9 switching control methods in the first time period and the 3 switching control methods in the second time period, there are a total of 9×3=27 switching control methods in one cycle. The main controller 410 can randomly or according to a certain rule select one of these 27 switching control methods to perform heating control under one winding. This application embodiment does not specifically limit this.

[0194] Furthermore, it should be noted that scenarios one through three described above are merely examples of specific switching control methods implemented by controlling the two three-phase windings to use the same number of windings for heating. In actual operation, the main controller can control the two three-phase windings to use the same or different numbers of windings for heating. There are at least 343 possible switching control methods. The main controller can select any of these 343 methods to perform heating control, thereby employing different winding combinations for heating. By changing the number of winding combinations, the adjustable range of the high-frequency pulse current used for heating in the power battery pack can be effectively improved.

[0195] In another example, if the heating mode is Buck-Boost first, the control signal generated by the main controller 410 is used to: control the switching module K in the first sub-period of the previous period of each cycle. 21 Switch module K 23 and switch module K 25 One or more of the switching modules are turned on, and all other switching modules except the one that is turned on are turned off; in the second sub-period of the period before the current period of each cycle, all switching modules are turned off; in the first sub-period of the period after the current period of each cycle, switching module K is controlled to turn off. 11 Switch module K 13 and switch module K 15 One or more of them, and switch module K 22 Switch module K 24 and switch module K 26One or more of the switching modules are turned on, and the other switching modules are turned off except for the ones that are turned on; in the second sub-period of the next period of each cycle, the switching module K is controlled to turn off. 11 Switch module K 13 and switch module K 15 One or more of the switches are turned on, and the other switches are turned off except for the ones that are turned on. In other words, compared with the control method corresponding to the Boost-then-Buck mode, the control method of the Boost-then-Buck mode is used for the first period of the Buck-then-Boost mode, and vice versa. For the specific control implementation logic, please refer to the above. Figures 10 to 12 The embodiments of this application will not be repeated in detail.

[0196] Furthermore, when the voltage of the first power battery pack 311 is greater than the voltage of the second power battery pack 321, similar to the first boost then buck mode, the first buck then boost mode also has no less than 343 switching control methods. The main controller can select any one of these no less than 343 switching control methods to execute the heating control in the first buck then boost mode.

[0197] When the voltage of the first power battery pack 311 is equal to the voltage of the second power battery pack 321:

[0198] When the voltage of the first power battery pack 311 is equal to the voltage of the second power battery pack 321, the main controller 410 can execute the corresponding heating control logic according to the case where the voltage of the first power battery pack 311 is greater than the voltage of the second power battery pack 321, or it can execute the corresponding heating control logic according to the case where the voltage of the first power battery pack 311 is less than the voltage of the second power battery pack 321. The specific implementation is not limited.

[0199] In the above embodiment 2, by connecting the second ends of the two three-phase windings and connecting the cathodes of the two power battery packs, a circuit can be formed between the cathodes of the two power battery packs and the two three-phase windings, thereby facilitating the generation of high-frequency pulse current in the circuit to heat the two power battery packs.

[0200]

Example 3

[0201] Figure 13 An exemplary schematic diagram of a heating control system provided in Embodiment 3 of this application is shown, such as... Figure 13As shown, in this example, the heating control system includes a control device 40 and a power battery pack device 30. The specific structures of the control device 40 and the power battery pack device 30 can be referred to in Embodiment 2 above, except that: in Embodiment 2, the cathode of the first power battery pack 311 is connected to the cathode of the second power battery pack 321, while in Embodiment 3, the anode of the first power battery pack 311 is connected to the anode of the second power battery pack 321.

[0202] The following is based on Figure 13 The heating control system shown is illustrated, and the specific control logic under different conditions is introduced:

[0203] When the voltage of the first power battery pack 311 is greater than the voltage of the second power battery pack 321:

[0204] In one example, if the heating mode is Buck-Boost first, the control signal generated by the main controller 410 is used to: control the switching module K in the first sub-period of the previous period of each cycle. 12 Switch module K 14 and switch module K 16 One or more of the switching modules are turned on, and all other switching modules except the one that is turned on are turned off; in the second sub-period of the period before the current period of each cycle, all switching modules are turned off; in the first sub-period of the period after the current period of each cycle, switching module K is controlled to turn off. 11 Switch module K 13 and switch module K 15 One or more of them, and switch module K 22 Switch module K 24 and switch module K 26 One or more of the switching modules are turned on, and the other switching modules are turned off except for the ones that are turned on; in the second sub-period of the next period of each cycle, the switching module K is controlled to turn off. 22 Switch module K 24 and switch module K 26 One or more of the switches are turned on, and the other switches are turned off except for the ones that are turned on.

[0205] In the above example, one or more can be any one, two, or three. In the above switch control logic, switch module K is turned on during the first sub-period of the previous period. 12 Switch module K 14 and switch module K 16There are one or more of these switching modules. There are 3 possibilities for activating one switching module, 3 possibilities for activating two switching modules, and 1 possibility for activating three switching modules. Therefore, there are a total of 7 switching control methods in the first sub-period of the previous period. Correspondingly, in the first sub-period of the next period, switching module K is activated... 11 Switch module K 13 and switch module K 15 One or more of them, and switch module K 22 Switch module K 24 and switch module K 26 One or more of the following, the on / off switch module K 11 Switch module K 13 and switch module K 15 One of the switching modules and the conducting switching module K 22 Switch module K 24 and switch module K 26 There are 9 possible scenarios for a single switch module, including the conduction switch module K. 11 Switch module K 13 and switch module K 15 One of the switching modules and the conducting switching module K 22 Switch module K 24 and switch module K 26 There are 9 possible configurations for the two switch modules in the circuit, with switch module K being turned on. 11 Switch module K 13 and switch module K 15 One of the switching modules and the conducting switching module K 22 Switch module K 24 and switch module K 26 There are three possibilities for the three switch modules in the middle, with switch module K being turned on. 11 Switch module K 13 and switch module K 15 Two switching modules in the middle and the switching module K is turned on. 22 Switch module K 24 and switch module K 26 There are 9 possible scenarios for a single switch module, including the conduction switch module K. 11 Switch module K 13 and switch module K 15 Two switching modules in the middle and the switching module K is turned on. 22 Switch module K 24 and switch module K 26 There are 9 possible configurations for the two switch modules in the circuit, with switch module K being turned on. 11 Switch module K 13 and switch module K15 Two switching modules in the middle and the switching module K is turned on. 22 Switch module K 24 and switch module K 26 There are three possibilities for the three switch modules in the middle, with switch module K being turned on. 11 Switch module K 13 and switch module K 15 The three switch modules in the middle and the conducting switch module K are connected. 22 Switch module K 24 and switch module K 26 There are three possibilities for the situation of a switch module, where switch module K is turned on. 11 Switch module K 13 and switch module K 15 The three switch modules in the middle and the conducting switch module K are connected. 22 Switch module K 24 and switch module K 26 There are three possibilities for the two switch modules in the middle, with switch module K being turned on. 11 Switch module K 13 and switch module K 15 The three switch modules in the middle and the conducting switch module K are connected. 22 Switch module K 24 and switch module K 26 There is one possibility for the three switching modules in the above-mentioned heating control logic, therefore there are a total of 49 switching control methods in the first sub-period of the subsequent time period. Thus, the heating control logic has at least 7 × 49 = 343 switching control methods. It should be noted that the "at least" here refers to the number of switching modules K that are activated in the second sub-period of the subsequent time period. 22 Switch module K 24 and switch module K 26 One or more of the switching modules K that are turned on in the first sub-period of the next time period 22 Switch module K 24 and switch module K 26 One or more of them may also be different. As for how many possible differences there are, we can deduce them by referring to the above content. This application will not list them one by one.

[0206] To facilitate a clearer understanding of the heating control logic described above, the following example illustrates the specific circuit implementation of the heating control by using the same number of windings in two three-phase windings as much as possible.

[0207] In this example, assuming the first sub-period of the previous period is represented as D1×T1, the second sub-period of the previous period is represented as (1-D1)×T1, the first sub-period of the next period is represented as D2×T2, and the second sub-period of the next period is represented as (1-D2)×T2, then:

[0208] Scenario 1: Heating via three windings

[0209] Assuming the main controller 410 determines that heating with three windings is used based on the target high-frequency pulse current, then Figure 14 An exemplary circuit diagram of a heating control circuit using three windings, provided in Embodiment 3 of this application, is shown, wherein:

[0210] Figure 14 Figure (A) shows the circuit diagram within the first sub-time period D1×T1 of the previous time period T1, referencing... Figure 14 As shown in (A), within the first sub-period D1×T1 of the previous time period T1, the switching module K 12 Switch module K 14 and switch module K 16 The transistor in the circuit is turned on, while the transistors in other switching modules are turned off. In this situation, the power battery pack V... 01 The released electrical energy flows into the power battery pack V 02 The anode, then passes through the power battery pack V 02 The cathode is divided into three paths, one of which passes through the switch module K. 22 The anti-parallel diode in the circuit flows into winding U2, and another path passes through switching module K. 24 The anti-parallel diode in the circuit flows into winding V2, and then through the switching module K. 26 The anti-parallel diode in the circuit flows into winding W2, thus storing energy in windings U2, V2, and W2. Afterwards, the energy flows out through the second terminals of these three windings, then splits into three streams flowing to windings U1, V1, and W1, where it is stored. Finally, the energy flowing from winding U1 passes through switching module K. 12 The electrical energy flowing out from the transistor in the circuit, originating from winding V1, passes through the switching module K. 14 The electrical energy flowing out from the transistor in the circuit, and flowing from the winding W1, passes through the switching module K. 16 The current flows out of the transistor and then into the power battery pack V. 01 The cathode. It can be seen that within the first sub-period D1×T1 of the previous time period T1, the power battery pack V... 01 The released electrical energy is fed into the power battery pack V through three windings in each three-phase winding. 02 It is charged, and three of the three-phase windings in each three-phase winding are also used for energy storage;

[0211] Figure 14 Figure (B) shows the circuit diagram within the second sub-time period (1-D1)×T1 of the previous time period T1, refer to... Figure 14 As shown in (B), during the second sub-period (1-D1)×T1 of the previous period T1, all transistors in the switching modules are turned off. In this case, since the three-phase windings in each three-phase winding have stored energy during the first sub-period D1×T1, when the power battery pack V... 01 After being disconnected, in order to maintain the original direction of the current, three windings in each three-phase winding will release the previously stored electrical energy, which will then be transmitted through the switching module K. 11 The anti-parallel diode and switching module K in the middle 13 The anti-parallel diodes and switching module K in 15 The current flows out from the anti-parallel diode in the middle and then flows into the power battery pack V. 02 The anode, and from the power battery pack V 02 The cathode flows out and passes through the switching module K. 22 The anti-parallel diode and switching module K in the middle 24 The anti-parallel diodes and switching module K in 26 The anti-parallel diodes in the winding flow out to windings U2, V2, and W2. It can be seen that within the second sub-period (1-D1)×T1 of the previous period T1, the electrical energy stored in the three windings of each three-phase winding is transferred to the power battery pack V. 02 Continue to provide power battery packs V 02 Charge;

[0212] Figure 14 The diagram shown in (C) is the circuit diagram within the first sub-time period D2×T2 of the subsequent time period T2, referencing... Figure 14 As shown in (C), within the first sub-time period D2×T2 of the subsequent time period T2, the switching module K 11 Switch module K 13 Switch module K 15 Switch module K 22 Switch module K 24 and switch module K 26 The transistor in the circuit is turned on, while the transistors in other switching modules are turned off. In this situation, the power battery pack V... 02 The released electrical energy is divided into three paths, one of which passes through the switching module K. 11 The transistor flows into winding U1, and another path passes through switching module K. 13 The transistor flows into winding V1, and then through switching module K. 15The transistor in the circuit draws energy into winding W1, thus storing energy in windings U1, V1, and W1. Then, the energy flows out through the second terminals of these three windings, forming a single stream, which then splits into three streams flowing to windings U2, V2, and W2, where it is stored. Finally, the energy flowing out of winding U2 passes through switching module K. 22 The electrical energy flowing out of the transistor and winding V2 passes through the switching module K. 24 The electrical energy flowing out of the transistor and winding W2 passes through the switching module K. 26 The current flows out of the transistor and then into the power battery pack V. 02 The cathode. It can be seen that within the first sub-period D2×T2 of the later time period T2, the power battery pack V... 02 The released electrical energy is stored in three windings of each three-phase winding;

[0213] Figure 14 The diagram shown in (D) is the circuit diagram within the second sub-time period (1-D2)×T2 of the subsequent time period T2, as referenced. Figure 14 As shown in (D), within the second sub-period (1-D2)×T2 of the subsequent time period T2, the switching module K 22 Switch module K 24 and switch module K 26 The transistor in the circuit is turned on, while the transistors in other switching modules are turned off. In this situation, although the power battery pack V... 02 The voltage is less than the power battery pack V 01 The voltage is [not specified in the original text], but since windings U2, V2, W2, U1, V1, and W1 have stored energy during the first sub-period D2×T2, in order to maintain the original direction of the current, windings U2, V2, W2, U1, V1, and W1 will release the previously stored electrical energy. The electrical energy released by the windings combines with the power battery pack V [not specified in the original text]. 02 The electrical energy released from the anode flows into the power battery pack V. 01 The anode. Afterwards, the power battery pack V... 01 The electrical energy flowing from the cathode is divided into three paths, one of which passes through the switching module K. 12 The anti-parallel diode in the circuit flows into winding U1, and another path passes through switching module K. 14 The anti-parallel diode in the circuit flows into winding V1, and then through the switching module K. 16 The anti-parallel diode in the middle flows into winding W1. It can be seen that within the second sub-period (1-D2)×T2 of the later time period T2, the power battery pack V... 02 The combined electrical energy stored in the three windings of each three-phase winding powers the power battery pack V. 01 Charge.

[0214] Therefore, it can be concluded that during the first period T1 of a cycle, electrical energy flows from the high-voltage power battery pack V. 01 Flow to the low-voltage power battery pack V 02 The power battery pack 30 operates in Buck mode, and during the later period T2 of a cycle, electrical energy is transferred from the low-voltage power battery pack V. 02 Flow to high voltage power battery pack V 01 The power battery pack 30 operates in Boost mode. It can be seen that within one cycle, the current flow direction in the power battery pack 30 changes, thereby generating a high-frequency pulse current in the power battery pack 30. This high-frequency pulse current flows through the power battery pack V. 01 and power battery pack V 02 At that time, due to the power battery pack V 01 and power battery pack V 02 The internal resistance of the battery pack generates Joule heat, which is then used to effectively heat the power battery pack V. 01 and power battery pack V 02 .

[0215] Scenario 2: Heating via two windings

[0216] Assuming the main controller 410 determines that two windings are used for heating based on the target high-frequency pulse current, then Figure 15 An exemplary circuit diagram of a heating control circuit using two windings, provided in Embodiment 3 of this application, is shown, wherein:

[0217] Figure 15 Figure (A) shows the circuit diagram within the first sub-time period D1×T1 of the previous time period T1, referencing... Figure 15 As shown in (A), within the first sub-period D1×T1 of the previous time period T1, in the switching module K 12 Switch module K 14 and switch module K 16 Select two switching modules, turn on the transistors in these two modules, and turn off the transistors in the other switching modules. For example, according to... Figure 15 As shown in (A), when the switching module K is turned on... 14 and switch module K 16 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 01 The released electrical energy flows into the power battery pack V 02 The anode, then passes through the power battery pack V 02 The cathode is divided into three paths, one of which passes through the switch module K. 22 The anti-parallel diode in the circuit flows into winding U2, and another path passes through switching module K. 24 The anti-parallel diode in the circuit flows into winding V2, and then through the switching module K.26 The anti-parallel diode in the circuit flows into winding W2, thus storing energy in windings U2, V2, and W2. Afterward, the energy flows out through the second terminals of these three windings, combining into one path, and then splitting into two paths flowing to windings V1 and W1, where it is stored. Finally, the energy flowing out of winding V1 passes through switching module K. 14 The electrical energy flowing out from the transistor in the circuit, and flowing from the winding W1, passes through the switching module K. 16 The current flows out of the transistor and then into the power battery pack V. 01 The cathode. It can be seen that within the first sub-period D1×T1 of the previous time period T1, the power battery pack V... 01 The released electrical energy is fed into the power battery pack V through three windings in the second three-phase winding and two windings in the first three-phase winding. 02 It is charged, and three windings in the second three-phase winding and two windings in the first three-phase winding are also used for energy storage;

[0218] Figure 15 Figure (B) shows the circuit diagram within the second sub-time period (1-D1)×T1 of the previous time period T1, refer to... Figure 15 As shown in (B), during the second sub-period (1-D1)×T1 of the previous period T1, all transistors in the switching modules are turned off. In this case, since windings U2, V2, W2, V1, and W1 have stored energy during the first sub-period D1×T1, when the power battery pack V... 01 After being disconnected, in order to maintain the original direction of the current, windings U2, V2, W2, V1, and W1 will release the previously stored electrical energy, which will then flow through switching module K. 11 The anti-parallel diode and switching module K in the middle 13 The anti-parallel diodes and switching module K in 15 The current flows out from the anti-parallel diode in the middle and then flows into the power battery pack V. 02 The anode, and from the power battery pack V 02 The cathode flows out to windings U2, V2, and W2. It can be seen that within the second sub-period (1-D1)×T1 of the previous period T1, the electrical energy stored in three windings of the second three-phase winding and two windings of the first three-phase winding is transferred to the power battery pack V. 02 Continue to provide power battery packs V 02 Charge;

[0219] Figure 15 The diagram shown in (C) is the circuit diagram within the first sub-time period D2×T2 of the subsequent time period T2, referencing... Figure 15 As shown in (C), within the first sub-period D2×T2 of the subsequent time period T2, in the switching module K 11Switch module K 13 and switch module K 15 Select two switch modules, and in switch module K 22 Switch module K 24 and switch module K 26 Select two switching modules to turn on the transistors in these four switching modules and turn off the transistors in the other switching modules. For example, according to... Figure 15 As shown in (C), when the switching module K is turned on... 11 Switch module K 15 Switch module K 22 and switch module K 24 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 02 The released electrical energy is divided into two paths, one of which passes through the switching module K. 11 The transistor flows into winding U1, and another path passes through switching module K. 15 The transistor in the circuit draws energy into winding W1, thus storing energy in windings U1 and W1. Then, the energy flows out through the second terminals of windings U1 and W1, splitting into two streams flowing into windings U2 and V2, where it is stored. Finally, the energy flowing out of winding U2 passes through switching module K. 22 The power switch module K outputs power from the transistor and from the winding V2. 24 The current flows out of the transistor and then into the power battery pack V. 02 The cathode. It can be seen that within the first sub-period D2×T2 of the later time period T2, the power battery pack V... 02 The released electrical energy is stored in two of the three-phase windings;

[0220] Figure 15 The diagram shown in (D) is the circuit diagram within the second sub-time period (1-D2)×T2 of the subsequent time period T2, as referenced. Figure 15 As shown in (D), within the second sub-period (1-D2)×T2 of the subsequent time period T2, in the switching module K 22 Switch module K 24 and switch module K 26 Select two switching modules that are identical to the first sub-time period D2×T2, turn on the transistors in these two switching modules, and turn off the transistors in the other switching modules. For example, according to... Figure 15 As shown in (D), when the switching module K is turned on... 22 and switch module K 24 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are turned off, although the power battery pack V 02 The voltage is less than the power battery pack V 01The voltage is [not specified in the original text], but since windings U2, V2, U1, and W1 have stored energy during the first sub-period D2×T2, in order to maintain the original direction of the current, windings U2, V2, U1, and W1 will release the previously stored electrical energy. The electrical energy released by the windings combines with the power battery pack V [not specified in the original text]. 02 The electrical energy released from the anode flows into the power battery pack V. 01 The anode. Afterwards, the power battery pack V... 01 The electrical energy flowing from the cathode passes through the switching module K. 12 The anti-parallel diode and switching module K in the middle 14 The anti-parallel diodes and switching module K in 16 The anti-parallel diodes in the circuit flow into the first three-phase winding. It can be seen that within the second sub-period (1-D2)×T2 of the subsequent time period T2, the power battery pack V... 02 The combined electrical energy stored in the two windings of each three-phase winding powers the power battery pack V. 01 Charge.

[0221] Therefore, the above implementation method can achieve alternating discharge between the two power battery packs by using two of the three-phase windings as much as possible. This helps to reduce the operating frequency of the windings while generating high-frequency pulse current to heat the power battery pack, thus extending the life of the motor as much as possible.

[0222] It should be understood that the above Figure 15 This is merely an illustrative description of one possible switching control method for heating via two windings. In this embodiment, since the previous time period T1 can select to turn on the switching module K... 12 Switch module K 14 and switch module K 16 For any two of them, that is, in the previous time period T1, there are a total of 3 possible switching control methods, namely: switching module K 12 and switch module K 14 Or switch module K 12 and switch module K 16 Or switch module K 14 and switch module K 16 The next time period can select the on / off switch module K. 11 Switch module K 13 and switch module K 15 Any two of them and the switch module K 22 Switch module K 24 and switch module K 26 For any two of them, that is, the later time period T2, there are a total of 9 possible switching control methods, namely: switching module K 11 Switch module K 13 Switch module K 22and switch module K 24 Or switch module K 11 Switch module K 13 Switch module K 22 and switch module K 26 Or switch module K 11 Switch module K 13 Switch module K 24 and switch module K 26 Or switch module K 11 Switch module K 15 Switch module K 22 and switch module K 24 Or switch module K 11 Switch module K 15 Switch module K 22 and switch module K 26 Or switch module K 11 Switch module K 15 Switch module K 24 and switch module K 26 Or switch module K 13 Switch module K 15 Switch module K 22 and switch module K 24 Or switch module K 13 Switch module K 15 Switch module K 22 and switch module K 26 Or switch module K 13 Switch module K 15 Switch module K 24 and switch module K 26 Thus, when heating is achieved through two windings, combined with the three switching control methods in the first time period and the nine switching control methods in the second time period, there are a total of 3 × 9 = 27 switching control methods in one cycle. The main controller 410 can randomly or according to a certain rule select one of these 27 switching control methods to perform heating control under the two windings. This application embodiment does not specifically limit this.

[0223] Scenario 3: Heating through a single winding

[0224] Assuming the main controller 410 determines that a single winding should be used for heating based on the target high-frequency pulse current, then Figure 16 An exemplary circuit diagram of a heating control circuit via a winding, provided in Embodiment 3 of this application, is shown, wherein:

[0225] Figure 16 Figure (A) shows the circuit diagram within the first sub-time period D1×T1 of the previous time period T1, referencing... Figure 16 As shown in (A), within the first sub-period D1×T1 of the previous time period T1, in the switching module K 12 Switch module K 14 and switch module K 16 Select one switching module, turn on the transistor in that switching module, and turn off the transistors in the other switching modules. For example, according to... Figure 16 As shown in (A), when the switching module K is turned on... 14 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 01 The released electrical energy flows into the power battery pack V 02 The anode, then passes through the power battery pack V 02 The cathode is divided into three paths, one of which passes through the switch module K. 22 The anti-parallel diode in the circuit flows into winding U2, and another path passes through switching module K. 24 The anti-parallel diode in the circuit flows into winding V2, and then through the switching module K. 26 The anti-parallel diode in the circuit flows into winding W2, thus storing energy in windings U2, V2, and W2. Then, the energy flows through the second terminals of these three windings, combining into a single path before flowing out to winding V1, where it is stored. Finally, the energy flowing from winding V1 passes through switching module K. 14 The transistor in the middle flows out to the power battery pack V 01 The cathode. It can be seen that within the first sub-period D1×T1 of the previous time period T1, the power battery pack V... 01 The released electrical energy is fed into the power battery pack V through three windings of the second three-phase winding and one winding of the first three-phase winding. 02 The device is charged, and three windings in the second three-phase winding and one winding in the first three-phase winding are also used for energy storage.

[0226] Figure 16 Figure (B) shows the circuit diagram within the second sub-time period (1-D1)×T1 of the previous time period T1, refer to... Figure 16 As shown in (B), during the second sub-period (1-D1)×T1 of the previous period T1, all transistors in the switching modules are turned off. In this case, since windings U2, V2, W2, and V1 have stored energy during the first sub-period D1×T1, when the power battery pack V... 01 After being disconnected, in order to maintain the original direction of the current, windings U2, V2, W2, and V1 will release the previously stored electrical energy, which will then flow through switching module K. 11 The anti-parallel diode and switching module K in the middle 13 The anti-parallel diodes and switching module K in 15The current flows out from the anti-parallel diode in the middle and then flows into the power battery pack V. 02 The anode, and from the power battery pack V 02 The cathode flows out to windings U2, V2, and W2. It can be seen that within the second sub-period (1-D1)×T1 of the previous period T1, the electrical energy stored in three windings of the second three-phase winding and one winding of the first three-phase winding is transferred to the power battery pack V. 02 Continue to provide power battery packs V 02 Charge;

[0227] Figure 16 The diagram shown in (C) is the circuit diagram within the first sub-time period D2×T2 of the subsequent time period T2, referencing... Figure 16 As shown in (C), within the first sub-period D2×T2 of the subsequent time period T2, in the switching module K 11 Switch module K 13 and switch module K 15 Select a switch module, and in switch module K 22 Switch module K 24 and switch module K 26 Select one switching module, turn on the transistors in these two switching modules, and turn off the transistors in the other switching modules. For example, according to... Figure 16 As shown in (C), when the switching module K is turned on... 11 and switch module K 22 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 02 The released electrical energy passes through the switching module K 11 The energy flows into winding U1 through the transistor, thus storing energy in winding U1. Then, the energy flowing out of winding U1 flows to winding U2, where it is stored. Finally, the energy flowing out of winding U2 passes through switching module K. 22 The current flows out of the transistor and then into the power battery pack V. 02 The cathode. It can be seen that within the first sub-period D2×T2 of the later time period T2, the power battery pack V... 02 The released electrical energy is stored in one winding of each three-phase winding;

[0228] Figure 16 The diagram shown in (D) is the circuit diagram within the second sub-time period (1-D2)×T2 of the subsequent time period T2, as referenced. Figure 16 As shown in (D), within the second sub-period (1-D2)×T2 of the subsequent time period T2, in the switching module K 22 Switch module K 24 and switch module K 26Select a switching module that is the same as the first sub-time period D2×T2, turn on the transistor in that switching module, and turn off the transistors in the other switching modules. For example, according to Figure 16 As shown in (D), when the switching module K is turned on... 22 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are turned off, although the power battery pack V 02 The voltage is less than the power battery pack V 01 The voltage is [not specified], but since windings U2 and U1 have stored energy during the first sub-period D2×T2, in order to maintain the original direction of the current, windings U2 and U1 will release the previously stored electrical energy. The electrical energy released by the windings combines with the power battery pack V [not specified]. 02 The electrical energy released from the anode flows into the power battery pack V. 01 The anode. Afterwards, the power battery pack V... 01 The electrical energy flowing from the cathode passes through the switching module K. 12 The anti-parallel diode and switching module K in the middle 14 The anti-parallel diodes and switching module K in 16 The anti-parallel diodes in the circuit flow into the first three-phase winding. It can be seen that within the second sub-period (1-D2)×T2 of the subsequent time period T2, the power battery pack V... 02 The combined electrical energy stored in one winding of each three-phase winding powers the V power battery pack. 01 Charge.

[0229] Therefore, the above implementation method can achieve alternating discharge between the two power battery packs by using one winding in each three-phase winding as much as possible. This helps to further reduce the operating frequency of the windings and extend the life of the motor while generating high-frequency pulse current to heat the power battery pack.

[0230] It should be understood that the above Figure 16 This is merely an illustrative description of one possible switching control method for heating via a single winding. In this embodiment, since the previous time period T1 can select to turn on the switching module K... 12 Switch module K 14 and switch module K 16 For any one of them, that is, in the previous time period T1, there are 3 possible switching control methods, namely: switching module K 12 Or switch module K 14 Or switch module K 16 The next time period can select the on / off switch module K. 11 Switch module K 13 and switch module K 15 Any one of them and the switch module K 22 Switch module K 24 and switch module K26 For any one of them, that is, in the next time period T2, there are a total of 9 possible switching control methods, namely: switching module K 11 and switch module K 22 Or switch module K 11 and switch module K 24 Or switch module K 11 and switch module K 26 Or switch module K 13 and switch module K 22 Or switch module K 13 and switch module K 24 Or switch module K 13 and switch module K 26 Or switch module K 15 and switch module K 22 Or switch module K 15 and switch module K 24 Or switch module K 15 and switch module K 26 Thus, when heating is performed through one winding, combined with the three switching control methods in the first time period and the nine switching control methods in the second time period, there are a total of 3 × 9 = 27 switching control methods in one cycle. The main controller 410 can randomly or according to a certain rule select one of these 27 switching control methods to perform heating control under one winding. This application embodiment does not specifically limit this.

[0231] Furthermore, it should be noted that scenarios one through three described above are merely examples of specific switching control methods implemented by controlling the two three-phase windings to use the same number of windings for heating. In actual operation, the main controller can control the two three-phase windings to use the same or different numbers of windings for heating. There are at least 343 possible switching control methods. The main controller can select any of these 343 methods to perform heating control, thereby employing different winding combinations for heating. By changing the number of winding combinations, the adjustable range of the high-frequency pulse current used for heating in the power battery pack can be effectively improved.

[0232] In another example, if the heating mode is Boost followed by Buck, the control signal generated by the main controller 410 is used to: control the switching module K in the first sub-period of the previous period in each cycle. 11 Switch module K 13 and switch module K 15 One or more of them, and switch module K 22 Switch module K 24 and switch module K 26One or more of the switching modules are turned on, and the other switching modules are turned off except for the ones that are turned on; in the second sub-period of the previous period of each cycle, the switching module K is controlled to turn off. 22 Switch module K 24 and switch module K 26 One or more of the switching modules are turned on, and the other switching modules are turned off except for the ones that are turned on; in the first sub-period of the next period of each cycle, the switching module K is controlled to turn off. 12 Switch module K 14 and switch module K 16 One or more of the switching modules are turned on, and all other switching modules except those that are turned on are turned off; in the second sub-period of the next period of each cycle, all switching modules are turned off. In other words, compared with the control method corresponding to the Buck-then-Boost mode, the first period of the Boost-then-Buck mode adopts the control method of the second period of the Buck-then-Boost mode, and the second period of the Boost-then-Buck mode adopts the control method of the first period of the Buck-then-Boost mode. For the specific control implementation logic, please refer directly to the above. Figures 14 to 16 The embodiments of this application will not be repeated in detail.

[0233] Furthermore, when the voltage of the first power battery pack 311 is greater than the voltage of the second power battery pack 321, similar to the Buck-then-Boost mode, the Boost-then-Buck mode also has no fewer than 343 switching control methods. The main controller can select any of these no fewer than 343 switching control methods to execute the heating control in the Buck-then-Boost mode, so as to use different winding combinations for heating. By changing the number of winding combinations, the adjustable range of the high-frequency pulse current used for heating in the power battery pack device can be effectively improved.

[0234] When the voltage of the first power battery pack 311 is less than the voltage of the second power battery pack 321:

[0235] In one example, if the heating mode is Boost followed by Buck, the control signal generated by the main controller 410 is used to: control the switching module K in the first sub-period of the preceding period in each cycle. 12 Switch module K 14 and switch module K 16 One or more of them, and switch module K 21 Switch module K 23 and switch module K 25 One or more of the switching modules are turned on, and the other switching modules are turned off except for the ones that are turned on; in the second sub-period of the previous period of each cycle, the switching module K is controlled to turn off.12 Switch module K 14 and switch module K 16 One or more of the switching modules are turned on, and the other switching modules are turned off except for the ones that are turned on; in the first sub-period of the next period of each cycle, the switching module K is controlled to turn off. 22 Switch module K 24 and switch module K 26 One or more of the switching modules are turned on, and the other switching modules are turned off except for the ones that are turned on; in the second sub-period of the next period of each cycle, all switching modules are turned off.

[0236] In the above example, one or more can be any one, two, or three. In the above switch control logic, switch module K is turned on during the first sub-period of the previous period. 12 Switch module K 14 and switch module K 16 One or more of them, and switch module K 21 Switch module K 23 and switch module K 25 One or more of the following, the on / off switch module K 12 Switch module K 14 and switch module K 16 One of the switching modules and the conducting switching module K 21 Switch module K 23 and switch module K 25 There are 9 possible scenarios for a single switch module, including the conduction switch module K. 12 Switch module K 14 and switch module K 16 One of the switching modules and the conducting switching module K 21 Switch module K 23 and switch module K 25 There are 9 possible configurations for the two switch modules in the circuit, with switch module K being turned on. 12 Switch module K 14 and switch module K 16 One of the switching modules and the conducting switching module K 21 Switch module K 23 and switch module K 25 There are three possibilities for the three switch modules in the middle, with switch module K being turned on. 12 Switch module K 14 and switch module K 16 Two switching modules in the middle and the switching module K is turned on. 21 Switch module K 23 and switch module K 25There are 9 possible scenarios for a single switch module, including the conduction switch module K. 12 Switch module K 14 and switch module K 16 Two switching modules in the middle and the switching module K is turned on. 21 Switch module K 23 and switch module K 25 There are 9 possible configurations for the two switch modules in the circuit, with switch module K being turned on. 12 Switch module K 14 and switch module K 16 Two switching modules in the middle and the switching module K is turned on. 21 Switch module K 23 and switch module K 25 There are three possibilities for the three switch modules in the middle, with switch module K being turned on. 12 Switch module K 14 and switch module K 16 The three switch modules in the middle and the conducting switch module K are connected. 21 Switch module K 23 and switch module K 25 There are three possibilities for the situation of a switch module, where switch module K is turned on. 12 Switch module K 14 and switch module K 16 The three switch modules in the middle and the conducting switch module K are connected. 21 Switch module K 23 and switch module K 25 There are three possibilities for the two switch modules in the middle, with switch module K being turned on. 12 Switch module K 14 and switch module K 16 The three switch modules in the middle and the conducting switch module K are connected. 21 Switch module K 23 and switch module K 25 There is only one possibility for the three switching modules in the previous time period, therefore there are a total of 49 switching control methods in the first sub-time period of the previous time period. Correspondingly, in the first sub-time period of the next time period, the switching module K is turned on. 22 Switch module K 24 and switch module K 26 There are 3 possibilities for activating one switch module, 3 possibilities for activating two switch modules, and 1 possibility for activating three switch modules. Therefore, there are a total of 7 switching control methods in the first sub-period of the previous period. It can be seen that the above heating control logic has no fewer than 49 × 7 = 343 switching control methods. It should be noted that the "no fewer than" here refers to the number of switch modules K activated in the second sub-period of the previous period.12 Switch module K 14 and switch module K 16 One or more of the switching modules K that were turned on in the first sub-period of the previous period. 12 Switch module K 14 and switch module K 16 One or more of them may also be different. As for how many possible differences there are, we can deduce them by referring to the above content. This application will not list them one by one.

[0237] To facilitate a clearer understanding of the heating control logic described above, the following example illustrates the specific circuit implementation of the heating control by using the same number of windings in two three-phase windings as much as possible.

[0238] In this example, assuming the first sub-period of the previous period is represented as D1×T1, the second sub-period of the previous period is represented as (1-D1)×T1, the first sub-period of the next period is represented as D2×T2, and the second sub-period of the next period is represented as (1-D2)×T2, then:

[0239] Scenario 1: Heating via three windings

[0240] Assuming the main controller 410 determines that heating with three windings is used based on the target high-frequency pulse current, then Figure 17 An exemplary circuit diagram of another heating control circuit using three windings provided in Embodiment 3 of this application is shown, wherein:

[0241] Figure 17 Figure (A) shows the circuit diagram within the first sub-time period D1×T1 of the previous time period T1, referencing... Figure 17 As shown in (A), within the first sub-period D1×T1 of the previous time period T1, the switching module K 12 Switch module K 14 Switch module K 16 Switch module K 21 Switch module K 23 and switch module K 25 The transistor in the circuit is turned on, while the transistors in other switching modules are turned off. In this situation, the power battery pack V... 01 The electrical energy released from the anode is divided into three paths, one of which passes through the switching module K. 21 The transistor in the middle flows into the winding U2, and another path passes through the switching module K. 23 The transistor flows into winding V2, and then through switching module K. 25The energy flows into winding W2 through the transistor, thus storing energy in windings U2, V2, and W2. Afterward, the energy is combined at the second terminals of these three windings, then split into three streams flowing to windings U1, V1, and W1, where it is stored. Finally, the energy flowing from winding U1 passes through switching module K. 12 The electrical energy flowing out from the transistor in the circuit, originating from winding V1, passes through the switching module K. 14 The electrical energy flowing out from the transistor in the circuit, and flowing from the winding W1, passes through the switching module K. 16 The current flows out of the transistor and then into the power battery pack V. 01 The cathode. It can be seen that within the first sub-period D1×T1 of the previous time period T1, the power battery pack V... 01 The released electrical energy is stored in three windings of each three-phase winding;

[0242] Figure 17 Figure (B) shows the circuit diagram within the second sub-time period (1-D1)×T1 of the previous time period T1, refer to... Figure 17 As shown in (B), within the second sub-period (1-D1)×T1 of the previous time period T1, the switching module K 12 Switch module K 14 and switch module K 16 The transistor in the circuit is turned on, while the transistors in other switching modules are turned off. In this situation, although the power battery pack V... 01 The voltage is less than the power battery pack V 02 The voltage is [not specified in the original text], but since windings U1, V1, W1, U2, V2, and W2 have stored energy during the first sub-period D1×T1, in order to maintain the original direction of the current, windings U1, V1, W1, U2, V2, and W2 will release the previously stored electrical energy. The electrical energy released by the windings is respectively transmitted through the switching module K. 12 Transistors and switching modules K 14 The transistor and switching module K in 16 The transistor in the middle flows into the power battery pack V 01 The cathode, and then combined with the power battery pack V 01 The electrical energy released from the anode flows out together to the power battery pack V. 02 The anode. Then, from the power battery pack V... 02 The electrical energy flowing from the cathode passes through the switching module K. 22 The anti-parallel diode and switching module K in the middle 24 The anti-parallel diodes and switching module K in 26 The anti-parallel diodes in the winding flow into windings U2, V2, and W2. It can be seen that within the second sub-period (1-D1)×T1 of the previous period T1, the power battery pack V...01 The combined electrical energy stored in the three windings of each three-phase winding powers the power battery pack V. 02 Charge;

[0243] Figure 17 The diagram shown in (C) is the circuit diagram within the first sub-time period D2×T2 of the subsequent time period T2, referencing... Figure 17 As shown in (C), within the first sub-time period D2×T2 of the subsequent time period T2, the switching module K 22 Switch module K 24 and switch module K 26 The transistor in the circuit is turned on, while the transistors in other switching modules are turned off. In this situation, the power battery pack V... 02 The electrical energy released from the anode flows into the power battery pack V. 01 The anode of the power battery pack V 01 The electrical energy flowing from the cathode is divided into three paths, one of which passes through the switching module K. 12 The anti-parallel diode in the circuit flows into winding U1, and another path passes through switching module K. 14 The anti-parallel diode in the circuit flows into winding V1, and then through the switching module K. 16 The anti-parallel diode in the circuit flows into winding W1, thus storing energy in windings U1, V1, and W1. Then, the energy is combined at the second terminals of these three windings and then split into three separate flows to windings U2, V2, and W2, respectively, storing energy in windings U2, V2, and W2. Finally, the energy flowing out of winding U2 passes through switching module K. 22 The electrical energy flowing out of the transistor and the winding V2 passes through the switching module K. 24 The electrical energy flowing out of the transistor and the winding W2 passes through the switching module K. 26 The current flows out of the transistor and then into the power battery pack V. 02 The cathode. It can be seen that within the first sub-period D2×T2 of the later time period T2, the power battery pack V... 02 The released electrical energy is the power battery pack V. 01 Charging, and energy storage is carried out in the three windings of each three-phase winding;

[0244] Figure 17 The diagram shown in (D) is the circuit diagram within the second sub-time period (1-D2)×T2 of the subsequent time period T2, as referenced. Figure 17As shown in (D), during the second sub-period (1-D2)×T2 of the subsequent time period T2, all transistors in the switching modules are turned off. In this case, since windings U1, V1, W1, U2, V2, and W2 have stored energy during the first sub-period D2×T2, in order to maintain the original direction of the current, windings U2, V2, W2, U1, V1, and W1 will release the previously stored electrical energy, which will then flow through switching module K respectively. 21 The anti-parallel diode and switching module K in the middle 23 The anti-parallel diodes and switching module K in 25 The anti-parallel diode in the middle flows into the power battery pack V 01 The anode, and from the power battery pack V 01 The cathode flows out and then passes through switch module K. 12 The anti-parallel diode and switching module K in the middle 14 The anti-parallel diodes and switching module K in 16 The anti-parallel diodes in the circuit flow into windings U1, V1, and W1. It can be seen that within the second sub-period (1-D2)×T2 of the subsequent time period T2, the electrical energy stored in the three windings of each three-phase winding is transferred to the power battery pack V. 01 Continue to provide power battery packs V 01 Charge.

[0245] Therefore, it can be seen that during the first period T1 of a cycle, electrical energy flows from the low-voltage power battery pack V. 01 Flow to high voltage power battery pack V 02 The power battery pack 30 operates in Boost mode, and during the later period T2 of a cycle, electrical energy is drawn from the high-voltage power battery pack V. 02 Flow to the low-voltage power battery pack V 01 The power battery pack 30 operates in Buck mode. It can be seen that within one cycle, the current flow direction in the power battery pack 30 changes, thereby generating a high-frequency pulse current in the power battery pack 30. This high-frequency pulse current flows through the power battery pack V. 01 and power battery pack V 02 At that time, due to the power battery pack V 01 and power battery pack V 02 The internal resistance of the battery pack generates Joule heat, which is then used to effectively heat the power battery pack V. 01 and power battery pack V 02 .

[0246] Scenario 2: Heating via two windings

[0247] Assuming the main controller 410 determines that two windings are used for heating based on the target high-frequency pulse current, then Figure 18 An exemplary diagram illustrates another circuit diagram for heating control via two windings provided in Embodiment 3 of this application, wherein:

[0248] Figure 18 Figure (A) shows the circuit diagram within the first sub-time period D1×T1 of the previous time period T1, referencing... Figure 18 As shown in (A), within the first sub-period D1×T1 of the previous time period T1, in the switching module K 12 Switch module K 14 and switch module K 16 Select two switch modules, in switch module K 21 Switch module K 23 and switch module K 25 Select two switching modules to turn on the transistors in these four switching modules and turn off the transistors in the other switching modules. For example, according to... Figure 18 As shown in (A), when the switching module K is turned on... 12 Switch module K 14 Switch module K 21 and switch module K 25 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 01 The electrical energy released from the anode is divided into two paths, one of which passes through the switching module K. 21 The transistor in the middle flows into the winding U2, and another path passes through the switching module K. 25 The transistor in the circuit flows into winding W2, thus storing energy in windings U2 and W2. Then, the electrical energy is combined at the second end of windings U2 and W2, and then splits into two streams flowing to windings U1 and V1, where it is stored. Finally, the electrical energy flowing out of winding U1 passes through switching module K. 12 The electrical energy flowing out from the transistor in the circuit, originating from winding V1, passes through the switching module K. 14 The current flows out of the transistor and then into the power battery pack V. 01 The cathode. It can be seen that within the first sub-period D1×T1 of the previous time period T1, the power battery pack V... 01 The released electrical energy is stored in two of the three-phase windings;

[0249] Figure 18 Figure (B) shows the circuit diagram within the second sub-time period (1-D1)×T1 of the previous time period T1, refer to... Figure 18 As shown in (B), within the second sub-period (1-D1)×T1 of the previous time period T1, in the switching module K 12 Switch module K 14 and switch module K 16Select two switching modules that are the same as the first sub-time period D1×T1, turn on the transistors in these two switching modules, and turn off the transistors in the other switching modules. For example, referring to 18(B), when switching module K is turned on... 12 and switch module K 14 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are turned off, although the power battery pack V 01 The voltage is less than the power battery pack V 02 The voltage is [not specified in the original text], but since windings U1, V1, U2, and W2 have stored energy during the first sub-period D1×T1, in order to maintain the original direction of the current, windings U1, V1, U2, and W2 will release the previously stored electrical energy. The electrical energy released by the windings is respectively transmitted through the switching module K. 12 The transistor and switching module K in 14 The transistor in the middle flows into the power battery pack V 01 The cathode, and then combined with the power battery pack V 01 The released electrical energy flows out together to the power battery pack V 02 The anode. Afterwards, the power battery pack V... 02 The electrical energy flowing from the cathode passes through the switching module K. 22 The anti-parallel diode and switching module K in the middle 24 The anti-parallel diodes and switching module K in 26 The anti-parallel diode in the middle flows to the second three-phase winding. It can be seen that within the second sub-period (1-D1)×T1 of the previous time period T1, the power battery pack V... 01 The combined electrical energy stored in the two windings of each three-phase winding powers the power battery pack V. 02 Charge;

[0250] Figure 18 The diagram shown in (C) is the circuit diagram within the first sub-time period D2×T2 of the subsequent time period T2, referencing... Figure 18 As shown in (C), within the first sub-period D2×T2 of the subsequent time period T2, in the switching module K 22 Switch module K 24 and switch module K 26 Select two switching modules, turn on the transistors in these two modules, and turn off the transistors in the other switching modules. For example, according to... Figure 18 As shown in (C), when the switching module K is turned on... 22 and switch module K 24 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 02 The electrical energy released from the anode flows into the power battery pack V. 01 The anode of the power battery pack V 01The electrical energy flowing from the cathode is divided into three paths, one of which passes through the switching module K. 12 The anti-parallel diode in the circuit flows into winding U1, and another path passes through switching module K. 14 The anti-parallel diode in the circuit flows into winding V1, and then through the switching module K. 16 The anti-parallel diode in the circuit flows into winding W1, thus storing energy in windings U1, V1, and W1. Then, the energy is combined at the second terminals of these three windings and then split into two streams flowing to windings U2 and V2 respectively, where it is stored. Finally, the energy flowing out of winding U2 passes through switching module K. 22 The electrical energy flowing out of the transistor and the winding V2 passes through the switching module K. 24 The current flows out of the transistor and then into the power battery pack V. 02 The cathode. It can be seen that within the first sub-period D2×T2 of the later time period T2, the power battery pack V... 02 The released electrical energy is the power battery pack V. 01 The device is charged, and energy is stored in the three windings of the first three-phase winding and the two windings of the second three-phase winding.

[0251] Figure 18 The diagram shown in (D) is the circuit diagram within the second sub-time period (1-D2)×T2 of the subsequent time period T2, as referenced. Figure 18 As shown in (D), during the second sub-period (1-D2)×T2 of the subsequent time period T2, all transistors in the switching modules are turned off. In this case, since windings U1, V1, W1, U2, and V2 have stored energy during the first sub-period D2×T2, in order to maintain the original direction of the current, windings U1, V1, W1, U2, and V2 will release the previously stored energy, which will then flow through switching module K respectively. 21 The anti-parallel diode and switching module K in the middle 23 The anti-parallel diodes and switching module K in 25 The anti-parallel diode in the middle flows into the power battery pack V 01 The anode, and from the power battery pack V 01 The cathode flows out and then passes through switch module K. 12 The anti-parallel diode and switching module K in the middle 14 The anti-parallel diodes and switching module K in 16 The anti-parallel diodes in the first three-phase winding are connected to the second three-phase winding. It can be seen that during the second sub-period (1-D2)×T2 of the subsequent time period T2, the electrical energy stored in the three windings of the first three-phase winding and the two windings of the second three-phase winding is transferred to the power battery pack V. 01 Continue to provide power battery packs V 01 Charge.

[0252] Therefore, the above implementation method can achieve alternating discharge between the two power battery packs by using two windings in each three-phase winding. This helps to reduce the operating frequency of the windings while generating high-frequency pulse current to heat the power battery pack, thus extending the life of the motor as much as possible.

[0253] It should be understood that the above Figure 18 This is merely an illustrative description of one possible switching control method for heating via two windings. In this embodiment, since the previous time period T1 can select to turn on the switching module K... 12 Switch module K 14 and switch module K 16 Any two of them and the switch module K 21 Switch module K 23 and switch module K 25 For any two of them, that is, in the previous time period T1, there are a total of 9 possible switching control methods, namely: switching module K 12 Switch module K 14 Switch module K 21 and switch module K 23 Or switch module K 12 Switch module K 14 Switch module K 21 and switch module K 25 Or switch module K 12 Switch module K 14 Switch module K 23 and switch module K 25 Or switch module K 12 Switch module K 16 Switch module K 21 and switch module K 23 Or switch module K 12 Switch module K 16 Switch module K 21 and switch module K 25 Or switch module K 12 Switch module K 16 Switch module K 23 and switch module K 25 Or switch module K 14 Switch module K 16 Switch module K 21 and switch module K 23 Or switch module K 14 Switch module K 16 Switch module K 21 and switch module K 25 Or switch module K 14 Switch module K16 Switch module K 23 and switch module K 25 The next time period can select the on / off switch module K. 22 Switch module K 24 and switch module K 26 For any two of them, that is, the later time period T2, there are 3 possible switching control methods, namely: switching module K 22 and switch module K 24 Or switch module K 22 and switch module K 26 Or switch module K 24 and switch module K 26 Thus, when heating is achieved through two windings, combined with the nine switching control methods in the first time period and the three switching control methods in the second time period, there are a total of 9 × 3 = 27 switching control methods in one cycle. The main controller 410 can randomly or according to a certain rule select one of these 27 switching control methods to perform heating control for the two windings. This application embodiment does not specifically limit this.

[0254] Scenario 3: Heating through a single winding

[0255] Assuming the main controller 410 determines that a single winding should be used for heating based on the target high-frequency pulse current, then Figure 19 An exemplary circuit diagram of another heating control circuit via a winding, provided in Embodiment 3 of this application, is shown, wherein:

[0256] Figure 19 Figure (A) shows the circuit diagram within the first sub-time period D1×T1 of the previous time period T1, referencing... Figure 19 As shown in (A), within the first sub-period D1×T1 of the previous time period T1, in the switching module K 12 Switch module K 14 and switch module K 16 Select a switch module, in switch module K 21 Switch module K 23 and switch module K 25 Select one switching module, turn on the transistors in these two switching modules, and turn off the transistors in the other switching modules. For example, according to... Figure 19 As shown in (A), when the switching module K is turned on... 12 and switch module K 25 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 01 The electrical energy released from the anode passes through the switching module K 25The electrical energy flows into winding W2 through the transistor, thus storing energy in winding W2. Then, the electrical energy flows through the second end of winding W2 to winding U1, where it is stored. Finally, the electrical energy flowing out of winding U1 passes through switching module K. 12 After the transistor in the middle flows out, it flows into the power battery pack V. 01 The cathode. It can be seen that within the first sub-period D1×T1 of the previous time period T1, the power battery pack V... 01 The released electrical energy is stored in one winding of each three-phase winding;

[0257] Figure 19 Figure (B) shows the circuit diagram within the second sub-time period (1-D1)×T1 of the previous time period T1, refer to... Figure 19 As shown in (B), within the second sub-period (1-D1)×T1 of the previous time period T1, in the switching module K 12 Switch module K 14 and switch module K 16 Select a switching module that is the same as the first sub-time period D1×T1, turn on the transistor in that switching module, and turn off the transistors in the other switching modules. For example, referring to 19(B), when switching module K is turned on... 12 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are turned off, although the power battery pack V 01 The voltage is less than the power battery pack V 02 The voltage is [not specified], but since windings W2 and U1 have stored energy during the first sub-period D1×T1, in order to maintain the original direction of the current, windings W2 and U1 will release the previously stored electrical energy. The electrical energy released by the windings is transmitted through the switching module K. 12 The transistor in the middle flows into the power battery pack V 01 The cathode, and then combined with the power battery pack V 01 The released electrical energy flows out together to the power battery pack V 02 The anode. Afterwards, the power battery pack V... 02 The electrical energy flowing from the cathode passes through the switching module K. 22 The anti-parallel diode and switching module K in the middle 24 The anti-parallel diodes and switching module K in 26 The anti-parallel diodes in the circuit flow into the second three-phase winding. It can be seen that within the second sub-period (1-D1)×T1 of the previous period T1, the power battery pack V... 01 The combined electrical energy stored in one winding of each three-phase winding powers the V power battery pack. 02 Charge;

[0258] Figure 19 The diagram shown in (C) is the circuit diagram within the first sub-time period D2×T2 of the subsequent time period T2, referencing... Figure 19 As shown in (C), within the first sub-period D2×T2 of the subsequent time period T2, in the switching module K 22 Switch module K 24 and switch module K 26 Select one switching module, turn on the transistor in that switching module, and turn off the transistors in the other switching modules. For example, according to... Figure 19 As shown in (C), when the switching module K is turned on... 24 When the transistor in the power battery pack is turned off, and the transistors in other switching modules are also turned off, the power battery pack V... 02 The electrical energy released from the anode flows into the power battery pack V. 01 The anode of the power battery pack V 01 The electrical energy flowing from the cathode is divided into three paths, one of which passes through the switching module K. 12 The anti-parallel diode in the circuit flows into winding U1, and another path passes through switching module K. 14 The anti-parallel diode in the circuit flows into winding V1, and then through the switching module K. 16 The anti-parallel diode in the circuit flows into winding W1, thereby storing energy in windings U1, V1, and W1. Then, the energy is combined at the second terminals of these three windings and flows to winding V2, where it is stored. Finally, the energy flowing out of winding V2 passes through switching module K. 24 The transistor flows out and then into the power battery pack V. 02 The cathode. It can be seen that within the first sub-period D2×T2 of the later time period T2, the power battery pack V... 02 The released electrical energy is fed into the power battery pack V through the three windings of the first three-phase winding and one winding of the second three-phase winding. 01 The device is charged, and energy is stored in three windings of the first three-phase winding and one winding of the second three-phase winding.

[0259] Figure 19 The diagram shown in (D) is the circuit diagram within the second sub-time period (1-D2)×T2 of the subsequent time period T2, as referenced. Figure 19 As shown in (D), during the second sub-period (1-D2)×T2 of the subsequent time period T2, all transistors in the switching modules are turned off. In this case, since windings U1, V1, W1, and V2 have stored energy during the first sub-period D2×T2, in order to maintain the original direction of the current, windings U1, V1, W1, and V2 will release the previously stored energy, which will then flow through switching module K respectively. 21 The anti-parallel diode and switching module K in the middle 23 The anti-parallel diodes and switching module K in 25 The anti-parallel diode in the middle flows into the power battery pack V 01 The anode, and from the power battery pack V01 The cathode flows out and then passes through switch module K. 12 The anti-parallel diode and switching module K in the middle 14 The anti-parallel diodes and switching module K in 16 The anti-parallel diodes in the first three-phase winding flow into the first three-phase winding. It can be seen that during the second sub-period (1-D2)×T2 of the subsequent time period T2, the electrical energy stored in three windings of the first three-phase winding and one winding of the second three-phase winding is transferred to the power battery pack V. 01 Continue to provide power battery packs V 01 Charge.

[0260] Therefore, the above implementation method can achieve alternating discharge between two power battery packs through one winding of each three-phase winding, which helps to further reduce the operating frequency of the windings and further extend the life of the motor while generating high-frequency pulse current to heat the power battery pack.

[0261] It should be understood that the above Figure 19 This is merely an illustrative description of one possible switching control method for heating via a single winding. In this embodiment, since the previous time period T1 can select to turn on the switching module K... 12 Switch module K 14 and switch module K 16 Any one of them and the switch module K 21 Switch module K 23 and switch module K 25 For any one of them, that is, in the previous time period T1, there are a total of 9 possible switching control methods, namely: switching module K 12 and switch module K 21 Or switch module K 12 and switch module K 23 Or switch module K 12 and switch module K 25 Or switch module K 14 and switch module K 21 Or switch module K 14 and switch module K 23 Or switch module K 14 and switch module K 25 Or switch module K 16 and switch module K 21 Or switch module K 16 and switch module K 23 Or switch module K 16 and switch module K 25 The next time period can select the on / off switch module K. 22 Switch module K 24 and switch module K26 For any one of them, that is, in the next time period T2, there are 3 possible switching control methods, namely: switching module K 22 Or switch module K 24 Or switch module K 26 Thus, when heating is performed through one winding, combined with the 9 switching control methods in the first time period and the 3 switching control methods in the second time period, there are a total of 9×3=27 switching control methods in one cycle. The main controller 410 can randomly or according to a certain rule select one of these 27 switching control methods to perform heating control under one winding. This application embodiment does not specifically limit this.

[0262] Furthermore, it should be noted that scenarios one through three described above are merely examples of specific switching control methods implemented by controlling the two three-phase windings to use the same number of windings for heating. In actual operation, the main controller can control the two three-phase windings to use the same or different numbers of windings for heating. There are at least 343 possible switching control methods, and the main controller can select any one of these 343 methods to perform heating control.

[0263] In another example, if the heating mode is Buck-Boost first, the control signal generated by the main controller 410 is used to: control the switching module K in the first sub-period of the previous period of each cycle. 22 Switch module K 24 and switch module K 26 One or more of the switching modules are turned on, and all other switching modules except the one that is turned on are turned off; in the second sub-period of the period before the current period of each cycle, all switching modules are turned off; in the first sub-period of the period after the current period of each cycle, switching module K is controlled to turn off. 12 Switch module K 14 and switch module K 16 One or more of them, and switch module K 21 Switch module K 23 and switch module K 25 One or more of the switching modules are turned on, and the other switching modules are turned off except for the ones that are turned on; in the second sub-period of the next period of each cycle, the switching module K is controlled to turn off. 12 Switch module K 14 and switch module K 16One or more of the switches are turned on, and the other switches are turned off except for the ones that are turned on. In other words, compared with the control method corresponding to the Boost-then-Buck mode, the control method of the Boost-then-Buck mode is used for the first period of the Buck-then-Boost mode, and vice versa. For the specific control implementation logic, please refer to the above. Figures 17 to 19 The embodiments of this application will not be repeated in detail.

[0264] Furthermore, when the voltage of the first power battery pack 311 is greater than the voltage of the second power battery pack 321, similar to the first boost then buck mode, the first buck then boost mode also has no less than 343 switching control methods. The main controller can select any one of these no less than 343 switching control methods to execute the heating control in the first buck then boost mode.

[0265] When the voltage of the first power battery pack 311 is equal to the voltage of the second power battery pack 321:

[0266] When the voltage of the first power battery pack 311 is equal to the voltage of the second power battery pack 321, the main controller 410 can execute the corresponding heating control logic according to the case where the voltage of the first power battery pack 311 is greater than the voltage of the second power battery pack 321, or it can execute the corresponding heating control logic according to the case where the voltage of the first power battery pack 311 is less than the voltage of the second power battery pack 321. The specific implementation is not limited.

[0267] In the above embodiment three, by connecting the second ends of the two three-phase windings and connecting the anodes of the two power battery packs, a circuit can be formed between the anodes of the two power battery packs and the two three-phase windings, thereby facilitating the generation of high-frequency pulse current in the circuit to heat the two power battery packs.

[0268] It should be understood that the above embodiments two and three are only used as examples of IGBT as a switching module. In actual operation, other modules with anti-parallel diodes can also be selected as the switching module, and the corresponding control logic can be directly referred to the above content. This application does not make specific limitations on this.

[0269] According to the solution provided in the embodiments of this application, this application also provides an electric vehicle, including the heating control system described above.

[0270] According to the solution provided in the embodiments of this application, this application also provides a computer program product, which includes: computer program code, which, when run on a computer, causes the computer to implement the method executed by the control device described above.

[0271] According to the solution provided in the embodiments of this application, this application also provides a computer-readable storage medium storing program code, which, when run on a computer, causes the computer to implement the method executed by the control device described above.

[0272] According to the solution provided in the embodiments of this application, this application also provides an electronic device, which includes a processor connected to a memory. The processor is used to execute a computer program stored in the memory so that the electronic device implements the method executed by the control device described above.

[0273] The terms “component,” “module,” “system,” etc., used in this specification are used to refer to computer-related entities, hardware, firmware, combinations of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, and / or a computer. As illustrated, applications running on computing devices and computing devices can both be components. One or more components may reside in a process and / or an execution thread, and components may be located on a single computer and / or distributed among two or more computers. Furthermore, these components can be executed from various computer-readable media on which various data structures are stored. Components can communicate, for example, via local and / or remote processes based on signals having one or more data packets (e.g., data from two components interacting with another component between a local system, a distributed system, and / or a network, such as the Internet interacting with other systems via signals).

[0274] Those skilled in the art will recognize that the various illustrative logical blocks and steps described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this application.

[0275] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0276] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0277] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0278] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0279] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0280] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power battery pack device, characterized in that, include: First battery cell and second battery cell; The first battery unit includes a first power battery pack, a first three-phase rectifier bridge, and a first three-phase winding. The first DC terminal of the first three-phase rectifier bridge is connected to the anode of the first power battery pack, the second DC terminal of the first three-phase rectifier bridge is connected to the cathode of the first power battery pack, and the AC terminal of the first three-phase rectifier bridge is connected to the first terminal of the first three-phase winding. The second battery unit includes a second power battery pack, a second three-phase rectifier bridge, and a second three-phase winding. The first DC terminal of the second three-phase rectifier bridge is connected to the anode of the second power battery pack, the second DC terminal of the second three-phase rectifier bridge is connected to the cathode of the second power battery pack, and the AC terminal of the second three-phase rectifier bridge is connected to the first terminal of the second three-phase winding. The second end of the first three-phase winding is connected to the second end of the second three-phase winding; The first ends of the three windings in the first three-phase winding are connected to the three AC terminals of the first three-phase rectifier bridge; The first ends of the three windings in the second three-phase winding are connected to the three AC terminals of the second three-phase rectifier bridge.

2. The apparatus as claimed in claim 1, characterized in that, The rectifier diodes in the first three-phase rectifier bridge and / or the second three-phase rectifier bridge are switching modules with anti-parallel diodes. The device includes a first switching module and a second switching module, wherein: The first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module. The first switch module and the second switch module are connected in series, the third switch module and the fourth switch module are connected in series, and the fifth switch module and the sixth switch module are connected in series. The non-series node of the first switch module relative to the second switch module, the non-series node of the third switch module relative to the fourth switch module, and the non-series node of the fifth switch module relative to the sixth switch module are respectively connected to the anode of the first power battery pack. The non-series node of the second switch module relative to the first switch module, the non-series node of the fourth switch module relative to the third switch module, and the non-series node of the sixth switch module relative to the fifth switch module are respectively connected to the cathode of the first power battery pack. The series nodes of the first switch module and the second switch module, the series nodes of the third switch module and the fourth switch module, and the series nodes of the fifth switch module and the sixth switch module are connected to the first ends of the three windings in the first three-phase winding. The second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module, and a twelfth switch module. The seventh switch module and the eighth switch module are connected in series. The non-series node of the seventh switch module relative to the eighth switch module, the non-series node of the ninth switch module relative to the tenth switch module, and the non-series node of the eleventh switch module relative to the twelfth switch module are respectively connected to the anode of the second power battery pack. The non-series node of the eighth switch module relative to the seventh switch module, the non-series node of the tenth switch module relative to the ninth switch module, and the non-series node of the twelfth switch module relative to the eleventh switch module are respectively connected to the cathode of the second power battery pack. The series nodes of the seventh and eighth switch modules, the series nodes of the ninth and tenth switch modules, and the series nodes of the eleventh and twelfth switch modules are connected to the first ends of three windings in the second three-phase winding.

3. A heating control system, characterized in that, It includes a first three-phase rectifier bridge, a first three-phase winding, a second three-phase rectifier bridge, and a second three-phase winding. The first DC terminal of the first three-phase rectifier bridge is connected to the anode of the first power battery pack, the second DC terminal of the first three-phase rectifier bridge is connected to the cathode of the first power battery pack, and the AC terminal of the first three-phase rectifier bridge is connected to the first terminal of the first three-phase winding. The first DC terminal of the second three-phase rectifier bridge is connected to the anode of the second power battery pack, the second DC terminal of the second three-phase rectifier bridge is connected to the cathode of the second power battery pack, and the AC terminal of the second three-phase rectifier bridge is connected to the first terminal of the second three-phase winding. The second end of the first three-phase winding is connected to the second end of the second three-phase winding; The first ends of the three windings in the first three-phase winding are connected to the three AC terminals of the first three-phase rectifier bridge; The first ends of the three windings in the second three-phase winding are connected to the three AC terminals of the second three-phase rectifier bridge.

4. The system as described in claim 3, characterized in that, An alternation cycle includes a first period and a second period, wherein the first period is after the second period, or the first period is before the second period; The cathodes of the first power battery pack and the second power battery pack are connected. The system includes a first switch module and a second switch module. The first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module. The second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module, and a twelfth switch module. If the voltage of the first power battery pack is greater than the voltage of the second power battery pack, then: During the first sub-period of the first time period, one or more of the first switch module, the third switch module, and the fifth switch module are turned on, and the other switch modules except for the turned-on switch modules are turned off. During the second sub-period of the first time period, the first to the twelfth switch modules are turned off; During the first sub-period of the second time period, one or more of the second switch module, the fourth switch module, and the sixth switch module, as well as one or more of the seventh switch module, the ninth switch module, and the eleventh switch module, are turned on, and the other switch modules except for the turned-on switch modules are turned off. During the second sub-period of the second time period, one or more of the seventh switch module, the ninth switch module, and the eleventh switch module are turned on, and the other switch modules are turned off except for the turned-on switch modules.

5. The system as described in claim 3, characterized in that, An alternation cycle includes a first period and a second period, wherein the first period is after the second period, or the first period is before the second period; The cathodes of the first power battery pack and the second power battery pack are connected. The system includes a first switch module and a second switch module. The first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module. The second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module, and a twelfth switch module. If the voltage of the second power battery pack is greater than the voltage of the first power battery pack, then: During the first sub-period of the first time period, one or more of the first switch module, the third switch module, and the fifth switch module, as well as one or more of the eighth switch module, the tenth switch module, and the twelfth switch module, are turned on, and the other switch modules except for the turned-on switch modules are turned off. During the second sub-period of the first time period, one or more of the first switch module, the third switch module, and the fifth switch module are turned on, and the other switch modules except for the turned-on switch modules are turned off. During the first sub-period of the second time period, one or more of the seventh switch module, the ninth switch module, and the eleventh switch module are turned on, and the other switch modules except for the turned-on switch modules are turned off. During the second sub-period of the second time period, the first switch module to the twelfth switch module are turned off.

6. The system as described in claim 3, characterized in that, An alternation cycle includes a first period and a second period, wherein the first period is after the second period, or the first period is before the second period; The anodes of the first power battery pack and the second power battery pack are connected. The system includes a first switch module and a second switch module. The first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module. The second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module, and a twelfth switch module. If the voltage of the first power battery pack is greater than the voltage of the second power battery pack, then: During the first sub-period of the first time period, one or more of the second switch module, the fourth switch module, and the sixth switch module are turned on, and the other switch modules except the turned-on switch modules are turned off. During the second sub-period of the first time period, the first to the twelfth switch modules are turned off; During the first sub-period of the second time period, one or more of the first switch module, the third switch module, and the fifth switch module, as well as one or more of the eighth switch module, the tenth switch module, and the twelfth switch module, are turned on, and the other switch modules except for the turned-on switch modules are turned off. During the second sub-period of the second time period, one or more of the eighth switch module, the tenth switch module, and the twelfth switch module are turned on, and the other switch modules are turned off except for the turned-on switch modules.

7. The system as described in claim 3, characterized in that, An alternation cycle includes a first period and a second period, wherein the first period is after the second period, or the first period is before the second period; The anodes of the first power battery pack and the second power battery pack are connected. The system includes a first switch module and a second switch module. The first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module, and a sixth switch module. The second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module, and a twelfth switch module. If the voltage of the second power battery pack is greater than the voltage of the first power battery pack, then: During the first sub-period of the first time period, one or more of the second switch module, the fourth switch module, and the sixth switch module, as well as one or more of the seventh switch module, the ninth switch module, and the eleventh switch module, are turned on, and the other switch modules except for the turned-on switch modules are turned off. During the second sub-period of the first time period, one or more of the second switch module, the fourth switch module, and the sixth switch module are turned on, and the other switch modules except the turned-on switch modules are turned off. During the first sub-period of the second time period, one or more of the eighth switch module, the tenth switch module, and the twelfth switch module are turned on, and the other switch modules are turned off except for the turned-on switch modules; During the second sub-period of the second time period, the first switch module to the twelfth switch module are turned off.

8. A control device, characterized in that, The control device is used in a heating control system, which includes a first three-phase rectifier bridge, a first three-phase winding, a second three-phase rectifier bridge, and a second three-phase winding. The first DC terminal of the first three-phase rectifier bridge is connected to the anode of the first power battery pack, the second DC terminal of the first three-phase rectifier bridge is connected to the cathode of the first power battery pack, and the AC terminal of the first three-phase rectifier bridge is connected to the first terminal of the first three-phase winding. The first DC terminal of the second three-phase rectifier bridge is connected to the anode of the second power battery pack, the second DC terminal of the second three-phase rectifier bridge is connected to the cathode of the second power battery pack, and the AC terminal of the second three-phase rectifier bridge is connected to the first terminal of the second three-phase winding. The second end of the first three-phase winding is connected to the second end of the second three-phase winding; The first ends of the three windings in the first three-phase winding are connected to the three AC terminals of the first three-phase rectifier bridge; The first ends of the three windings in the second three-phase winding are connected to the three AC terminals of the second three-phase rectifier bridge; The control device includes a first switch module, a second switch module, a first energy storage module, a second energy storage module, a main controller, a battery manager, and a motor controller. The battery manager is connected to the main controller, the first power battery pack, and the second power battery pack, respectively. The motor controller is connected to the main controller, the first switch module, the second switch module, the first energy storage module, and the second energy storage module, respectively. The battery manager is used to obtain the state of charge and current temperature of each power battery pack; The motor controller is used to obtain the operating status of each energy storage module; The main controller is also configured to determine, based on the state of charge of each power battery pack, that the sum of the charges of each power battery pack is sufficient to start the electric vehicle; determine, based on the current temperature of each power battery pack, that each power battery pack is in a low-temperature state; and, based on the working state of each energy storage module, determine that each energy storage module is not working, generate a control signal and send it to the motor controller. The motor controller is used to control the alternating discharge of the first power battery pack and the second power battery pack by controlling the conduction and cutoff of each switch module in the first switch module and the second switch module according to the control signal.

9. The control device as described in claim 8, characterized in that, The control device is specifically used for: The target high-frequency pulse current is determined based on the temperature difference between the ambient temperature and the target temperature, the preset heating time, and the correspondence between the preset temperature difference, heating time, and high-frequency pulse current. When the target high-frequency pulse current is less than the first current threshold, the first power battery pack and the second power battery pack are controlled to alternately discharge through one of the corresponding three-phase windings by controlling the first switching module and the second switching module. When the target high-frequency pulse current is not less than the first current threshold and less than the second current threshold, the first power battery pack and the second power battery pack are controlled to alternately discharge through two windings of the corresponding three-phase winding by controlling the first switching module and the second switching module. When the target high-frequency pulse current is not less than the second current threshold, the first power battery pack and the second power battery pack are controlled to alternately discharge through the three windings of their corresponding three-phase windings by controlling the first switching module and the second switching module.

10. The control device as claimed in claim 9, characterized in that, In the preset relationship between temperature difference, heating time, and high-frequency pulse current, where the temperature difference and preset heating time correspond to multiple high-frequency pulse currents: The control device is also used for: Select the target high-frequency pulse current from the plurality of high-frequency pulse currents; Obtain the first maximum current of the first three-phase winding at the frequency corresponding to the target high-frequency pulse current, the second maximum current of the second three-phase winding at the frequency corresponding to the target high-frequency pulse current, and the third maximum current corresponding to the connection node of the first three-phase winding and the second three-phase winding; If the target high-frequency pulse current is greater than the minimum value among the first maximum current, the second maximum current, and the third maximum current, then the target high-frequency pulse current is reselected from the plurality of high-frequency pulse currents.

11. The control device as described in any one of claims 8 to 10, characterized in that, An alternation cycle includes a first period and a second period, wherein the first period is after the second period, or the first period is before the second period; The cathodes of the first power battery pack and the second power battery pack are connected, and the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module and a twelfth switch module; If the voltage of the first power battery pack is greater than the voltage of the second power battery pack, then the control device is specifically used for: During the first sub-period of the first time period, one or more of the first switch module, the third switch module, and the fifth switch module are turned on, and the other switch modules except the ones that are turned on are turned off. During the second sub-period of the first time period, the first to twelfth switch modules are controlled to turn off; During the first sub-period of the second time period, control one or more of the second switch module, the fourth switch module, and the sixth switch module, as well as one or more of the seventh switch module, the ninth switch module, and the eleventh switch module to be turned on, and control the other switch modules except the turned-on switch modules to be turned off. During the second sub-period of the second time period, one or more of the seventh switch module, the ninth switch module, and the eleventh switch module are controlled to be turned on, and the other switch modules except the ones that are turned on are controlled to be turned off.

12. The control device as described in any one of claims 8 to 10, characterized in that, An alternation cycle includes a first period and a second period, wherein the first period is after the second period, or the first period is before the second period; The cathodes of the first power battery pack and the second power battery pack are connected, and the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module and a twelfth switch module; If the voltage of the second power battery pack is greater than the voltage of the first power battery pack, then the control device is specifically used for: During the first sub-period of the first time period, control one or more of the first switch module, the third switch module, and the fifth switch module, as well as one or more of the eighth switch module, the tenth switch module, and the twelfth switch module to be turned on, and control other switch modules except the turned-on switch modules to be turned off. During the second sub-period of the first time period, one or more of the first switch module, the third switch module, and the fifth switch module are turned on, and the other switch modules except the ones that are turned on are turned off. During the first sub-period of the second time period, one or more of the seventh switch module, the ninth switch module, and the eleventh switch module are controlled to be turned on, and the other switch modules except the ones that are turned on are controlled to be turned off. During the second sub-period of the second time period, the first to the twelfth switch modules are controlled to turn off.

13. The control device as described in any one of claims 8 to 10, characterized in that, An alternation cycle includes a first period and a second period, wherein the first period is after the second period, or the first period is before the second period; The anode of the first power battery pack is connected to the anode of the second power battery pack, and the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module and a twelfth switch module; If the voltage of the first power battery pack is greater than the voltage of the second power battery pack, then the control device is specifically used for: During the first sub-period of the first time period, one or more of the second switch module, the fourth switch module, and the sixth switch module are turned on, and the other switch modules except the ones that are turned on are turned off. During the second sub-period of the first time period, the first to twelfth switch modules are controlled to turn off; During the first sub-period of the second time period, control one or more of the first switch module, the third switch module, and the fifth switch module, as well as one or more of the eighth switch module, the tenth switch module, and the twelfth switch module to be turned on, and control other switch modules except the turned-on switch modules to be turned off; During the second sub-period of the second time period, one or more of the eighth switch module, the tenth switch module, and the twelfth switch module are turned on, and the other switch modules except the ones that are turned on are turned off.

14. The control device as described in any one of claims 8 to 10, characterized in that, An alternation cycle includes a first period and a second period, wherein the first period is after the second period, or the first period is before the second period; The anode of the first power battery pack is connected to the anode of the second power battery pack, and the first switch module includes a first switch module, a second switch module, a third switch module, a fourth switch module, a fifth switch module and a sixth switch module, and the second switch module includes a seventh switch module, an eighth switch module, a ninth switch module, a tenth switch module, an eleventh switch module and a twelfth switch module; If the voltage of the second power battery pack is greater than the voltage of the first power battery pack, then the control device is specifically used for: During the first sub-period of the first time period, control one or more of the second switch module, the fourth switch module, and the sixth switch module, as well as one or more of the seventh switch module, the ninth switch module, and the eleventh switch module to be turned on, and control other switch modules except the turned-on switch modules to be turned off; During the second sub-period of the first time period, one or more of the second switch module, the fourth switch module, and the sixth switch module are turned on, and the other switch modules except the ones that are turned on are turned off. During the first sub-period of the second time period, one or more of the eighth switch module, the tenth switch module, and the twelfth switch module are turned on, and the other switch modules except the ones that are turned on are turned off. During the second sub-period of the second time period, the first to the twelfth switch modules are controlled to turn off.

15. An electric vehicle, characterized in that, It includes a heating control system as described in any one of claims 3 to 7, or a control device as described in any one of claims 8 to 14.

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