Control method of a heating system of a battery and heating system

Abstract

A control method (200) of a heating system (100) of a battery, the control method (200) comprising: alternately controlling a switching module (120) to be in a first switching state for a first duration and to be in a second switching state for a second duration, the first duration and the second duration are both 2T; discharging, by a first loop, an energy storage module to a power supply module (110) for a first half time T of the first duration, and charging, by the first loop, the power supply module (110) to the energy storage module for a second half time T of the first duration; discharging, by a second loop, the energy storage module to the power supply module (110) for a first half time T of the second duration, and charging, by the second loop, the power supply module (110) to the energy storage module for a second half time T of the second duration, the second loop being different from the first loop.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a control method and control circuit for a battery heating system, a heating system, and an electrical device. Background Technology

[0002] Due to their advantages such as high energy density, rechargeability, safety, and environmental friendliness, batteries are widely used in new energy vehicles, consumer electronics, energy storage systems, and other fields.

[0003] However, the use of power batteries in low-temperature environments is limited. For example, the discharge capacity of batteries will decline in low-temperature environments, and they may even be unable to charge and / or discharge. Therefore, it is necessary to heat the batteries in low-temperature environments. Summary of the Invention

[0004] This application provides a control method and control circuit for a battery heating system, a heating system, and an electrical device, which can achieve battery heating.

[0005] In a first aspect, a control method for a battery heating system is provided. The heating system includes an energy storage module, a switching module, and a power supply module. The control method includes: alternately controlling the switching module to be in a first switching state for a first duration and in a second switching state for a second duration, both the first and second durations being 2T. In the first switching state, a first circuit is formed between the power supply module, the switching module, and the energy storage module. During the first half of the first duration (T), the energy storage module discharges to the power supply module through the first circuit, and during the second half of the first duration (T), the power supply module charges the energy storage module through the first circuit. In the second switching state, a second circuit is formed between the power supply module, the switching module, and the energy storage module. During the first half of the second duration (T), the energy storage module discharges to the power supply module through the second circuit, and during the second half of the second duration (T), the power supply module charges the energy storage module through the second circuit. The second circuit is different from the first circuit.

[0006] In this embodiment, battery heating is achieved by generating pulsed currents that discharge from the energy storage module to the power supply module and charge from the power supply module to the energy storage module. Furthermore, by controlling the switching module to switch between a first switching state and a second switching state, and generating pulsed currents that discharge from the energy storage module to the power supply module and charge from the power supply module to the energy storage module in each switching state, the switching frequency of the switching module is f / 2, and the frequency of the pulsed current is f. Therefore, the service life of the switching module can be extended, and the temperature rise of the motor controller can be significantly reduced.

[0007] In one possible implementation, the control method further includes: before alternately controlling the switch module to be in a first switching state during a first duration and in a second switching state during a second duration, controlling the switch module to be in a third switching state during a third duration, the third duration being T; in the third switching state, a third loop is formed between the power supply module, the switch module, and the energy storage module, and during the third duration, the power supply module charges the energy storage module through the third loop, the third loop being different from the next loop of the third loop, the next loop being the loop formed by the power supply module, the switch module, and the energy storage module when the switch module switches from the third switching state to another switching state.

[0008] In this embodiment, by controlling the switch module to be in a third switch state before alternating between the first and second switch states, and setting the duration of the third switch state to T, the power supply module can be controlled to charge the energy storage module to its initial energy. This allows for the generation of pulse currents during the alternating second and third switch states for a duration of 2T, resulting in the energy storage module discharging to the power supply module and the power supply module charging the energy storage module. This generates heat to heat the battery, enabling the switch module to switch at a frequency of f / 2 and the pulse current to have a frequency of f. Consequently, the lifespan of the switch module can be extended, and the temperature rise of the motor controller can be significantly reduced.

[0009] In one possible implementation, the next loop of the third loop is the first loop, and the third loop is the same as the second loop; or, the next loop of the third loop is the second loop, and the third loop is the same as the first loop.

[0010] In this embodiment, since the switching of the switch state is only to prevent the power supply module from continuously charging the energy storage module, setting the third circuit to be the same as the non-adjacent circuit can reduce the control complexity of the heating system. In addition, it is also beneficial to balance the utilization rate of each switch in the switching module.

[0011] In one possible implementation, the control method further includes: after alternately controlling the switching module to be in a first switching state for a first duration and in a second switching state for a second duration, controlling the switching module to be in a fourth switching state for a fourth duration, the fourth duration being T; after controlling the switching module to be in the fourth switching state, controlling all switches in the switching module to be disconnected to stop heating the battery; in the fourth switching state, a fourth circuit is formed between the power supply module, the switching module, and the energy storage module, and during the fourth duration, the energy storage module discharges to the power supply module through the fourth circuit, the fourth circuit being different from the previous circuit, which is a circuit formed by the power supply module, the switching module, and the energy storage module in another switching state where the switching module switches to the fourth switching state.

[0012] In this embodiment, when the battery heating stops, after the control switch module alternately switches between the first switch state and the second switch state, the control switch module is in the fourth switch state, and the duration of the fourth switch state is set to T. This allows the energy stored by the power supply module charging the energy storage module in the second switch state or the third switch state to be released to 0, so that the current of the energy storage module can be 0, thereby avoiding damage to the switch module due to electrical stress.

[0013] In one possible implementation, the preceding loop of the fourth loop is the first loop, and the fourth loop is the same as the second loop; or, the preceding loop of the fourth loop is the second loop, and the fourth loop is the same as the first loop.

[0014] In this embodiment, since the switching of the switch state is only to prevent the power supply module from continuously charging the energy storage module, setting the fourth circuit to be the same as the non-adjacent circuit can reduce the control complexity of the heating system. In addition, it is also beneficial to balance the utilization rate of each switch in the switching module.

[0015] In one possible implementation, the energy storage module includes multiple windings and at least one inductor in a first motor. The switching module includes a first bridge arm group and a second bridge arm group. Each bridge arm in the first and second bridge arm groups includes an upper bridge arm and a lower bridge arm. The connection points of the upper and lower bridge arms of each bridge arm in the first bridge arm group are connected one-to-one with each of the multiple windings. The connection points of the upper and lower bridge arms of each bridge arm in the second bridge arm group are connected one-to-one with each of the at least one inductor. Both the first and second bridge arm groups are connected in parallel to the power supply module. The alternating control of the switching module to be in a first switching state during a first duration and to be in a second switching state during a second duration includes: alternatingly controlling all the components in the first bridge arm group... The lower bridge arm is turned on, all upper bridge arms in the first bridge arm group are turned off, all upper bridge arms in the second bridge arm group are turned on and all lower bridge arms in the second bridge arm group are turned off, and all upper bridge arms in the first bridge arm group are turned on, all lower bridge arms in the first bridge arm group are turned off, all lower bridge arms in the second bridge arm group are turned on and all upper bridge arms in the second bridge arm group are turned off; wherein, in the first switching state, the first circuit is formed between the power supply module, all lower bridge arms in the first bridge arm group, the plurality of windings, the at least one inductor and all upper bridge arms in the second bridge arm group; in the second switching state, the second circuit is formed between the power supply module, all upper bridge arms in the first bridge arm group, the plurality of windings, the at least one inductor and all lower bridge arms in the second bridge arm group.

[0016] In this embodiment, the energy storage module reuses the motor windings in the electrical device, which can reduce the cost of heating the battery of the electrical device.

[0017] In one possible implementation, the plurality of windings are all the windings in the first motor, and the at least one inductor is an external inductor independent of the first motor, and the at least one inductor is connected to the neutral point of the first motor.

[0018] In this embodiment, by controlling the current flowing through all windings of the first motor to be equal in magnitude and phase, the vibration noise generated when heating the power battery using the first motor circuit is effectively suppressed. Simultaneously, by preventing the first motor from operating, the problem of rotor overheating in the motor is also resolved, thereby extending the battery's self-heating lifespan.

[0019] In one possible implementation, the plurality of windings are all the windings in the first motor, the at least one inductor is all the windings in the second motor, and the neutral point of the first motor is connected to the neutral point of the second motor.

[0020] In this embodiment, by controlling the current flowing through all windings of the first motor to be of equal magnitude and phase, and the current flowing through all windings of the second motor to be of equal magnitude and phase, the vibration noise of the motors can be effectively suppressed when the circuits of the first and second motors are used to heat the power battery. Furthermore, the power battery heating system provided in this application does not cause the first and second motors to operate, thus solving the problem of rotor overheating in the motors and extending the battery's self-heating lifespan.

[0021] In one possible implementation, the first motor is a three-phase motor.

[0022] In one possible implementation, the first motor is a six-phase motor, the plurality of windings are three of the six-phase motor windings, the at least one inductor is another three of the six-phase motor windings, and the spatial phase difference between the three windings is 120°.

[0023] In this embodiment, by controlling the spatial phase difference between three windings of the six-phase motor and the spatial phase difference between the current flowing through the other three windings of the six-phase motor to be 120°, the vibration noise of the motor can be effectively suppressed when the circuit of the six-phase motor is used to heat the power battery. Furthermore, the power battery heating system provided in this application does not cause the motor to run, thus solving the problem of rotor overheating in the motor and extending the battery's self-heating lifespan.

[0024] In one possible implementation, controlling the switch module to be in a fourth switching state for a fourth duration includes: controlling the switch module to be in the fourth switching state for the fourth duration when it is determined that heating of the battery will stop.

[0025] In this embodiment, once it is determined that heating of the battery has stopped, the switching module can be controlled to the fourth switching state, thereby releasing the energy stored in the energy storage module to 0, thus avoiding damage to the switching module due to electrical stress.

[0026] In one possible implementation, the control method further includes determining whether to stop heating the battery based on the battery's temperature.

[0027] In this embodiment, the system determines whether to stop heating the battery based on its temperature, enabling timely control of the charging device to charge the battery and thus improving charging efficiency.

[0028] In one possible implementation, the control method further includes determining the first duration and / or the second duration based on the battery's temperature and / or state of charge (SOC).

[0029] In this embodiment, dynamically adjusting the first duration and / or the second duration based on the battery temperature and / or SOC is beneficial for improving the efficiency of battery heating.

[0030] In one possible implementation, the power supply module is the battery.

[0031] In a second aspect, a heating system for a battery is provided, the heating system comprising an energy storage module, a switching module, a power supply module, and a control module; the control module is used to execute the control methods as described in the first aspect and any possible implementation thereof.

[0032] Thirdly, a control circuit for a battery heating system is provided, including a processor for executing control methods as described in the first aspect and any possible implementation thereof.

[0033] Fourthly, an electrical device is provided, comprising a battery and a heating system for the battery in the second aspect, the heating system being used to heat the battery, the battery being used to provide power to the electrical device. Attached Figure Description

[0034] Figure 1 A schematic circuit diagram of a battery heating system is shown.

[0035] Figure 2 A schematic block diagram of a control method for a battery heating system provided in an embodiment of this application is shown.

[0036] Figure 3 Another schematic block diagram of a control method for a battery heating system provided in an embodiment of this application is shown.

[0037] Figure 4 A schematic circuit diagram of a battery heating system provided in an embodiment of this application is shown.

[0038] Figure 5 A schematic circuit diagram of another battery heating system provided in an embodiment of this application is shown.

[0039] Figure 6 A schematic circuit diagram of another battery heating system provided in an embodiment of this application is shown.

[0040] Figures 7 to 12 This application illustrates an embodiment based on... Figure 4 The schematic circuit diagrams for each stage of the control method of the heating system shown are presented.

[0041] Figures 13 to 18 This application illustrates an embodiment based on... Figure 5The schematic circuit diagrams for each stage of the control method of the heating system shown are presented.

[0042] Figures 19 to 24 This application illustrates an embodiment based on... Figure 4 The schematic circuit diagrams for each stage of the control method of the heating system shown are presented.

[0043] Figure 25 The timing diagrams of the drive signal-pulse current in various switching states in the embodiments of this application are shown.

[0044] Figure 26 A schematic block diagram of a battery heating system provided in an embodiment of this application is shown.

[0045] Figure 27 A schematic block diagram of the control circuit of the battery heating system provided in an embodiment of this application is shown. Detailed Implementation

[0046] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0047] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0048] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0049] It should be noted that the battery in this application embodiment can generally be referred to as a power battery, specifically a lithium-ion battery, lithium metal battery, lead-acid battery, nickel-metal hydride battery, lithium-sulfur battery, lithium-air battery, or sodium-ion battery, etc., without limitation. In terms of scale, the battery in this application embodiment can be a single cell, a battery module, or a battery pack, without limitation. In terms of application scenarios, the battery can be used in power devices such as automobiles and ships. For example, it can be used in electric vehicles to power the motor, serving as the power source for electric vehicles. The battery can also power other electrical components in electric vehicles, such as in-vehicle air conditioning and in-vehicle media players.

[0050] With the development of the times, new energy vehicles have huge market prospects due to their advantages such as environmental friendliness, low noise, and low operating costs. They can also effectively promote energy conservation and emission reduction, which is beneficial to social development and progress.

[0051] Due to the electrochemical characteristics of power batteries, their charging and discharging capabilities are significantly limited in low-temperature environments, severely impacting the customer's winter driving experience. Therefore, in order to ensure the normal operation of the power battery, it is necessary to heat it in low-temperature environments.

[0052] For ease of description, the following will use the application of power batteries in new energy vehicles (power vehicles) as an example.

[0053] The drive motor and its control system are among the core components of new energy vehicles, and their driving characteristics determine the main performance indicators of the vehicle. The motor drive system of a new energy vehicle mainly consists of a motor, power converter, inverter, various sensors, and power supply. A motor is a rotating electromagnetic machine that operates based on the principle of electromagnetic induction, used to convert electrical energy into mechanical energy. During operation, it absorbs electrical power from the electrical system and outputs mechanical power to the mechanical system.

[0054] To avoid increasing unnecessary costs when heating the power battery, the commonly used solution is to use the motor circuit to heat the power battery.

[0055] Figure 1 A circuit diagram of a battery heating system is shown. (For example...) Figure 1 As shown, the heating system 100 may include a power supply module 110, a switch module 120 connected to the power supply module 110, and a motor 130 connected to the switch module 120.

[0056] The power supply module 110 can be implemented not only by the battery itself, but also by an external power supply module such as a charging pile. The heating energy provided by this external power supply module can be, for example, output from an external DC charger, or output from an external AC charger after rectification; no specific restrictions are made here.

[0057] Various types of switches can be used to implement the switching module 120. For example, the switching module 120 can be implemented by an inverter in a motor drive system, wherein the inverter can be implemented using bridge arm switches of an insulated-gate bipolar transistor (IGBT). Specifically, the number of bridge arms of the inverter is the same as the number of windings in the motor winding 130. For example, if the motor 130 includes a three-phase winding, then the inverter includes three-phase bridge arms, namely, a U-phase bridge arm, a V-phase bridge arm, and a W-phase bridge arm. Each of the three-phase bridge arms has an upper bridge arm and a lower bridge arm, and each upper bridge arm and lower bridge arm is provided with a switching unit. That is, the switching module 120 includes an upper bridge arm switch 121 and a lower bridge arm switch 122 in the U-phase bridge arm, an upper bridge arm switch 123 and a lower bridge arm switch 124 in the V-phase bridge arm, and an upper bridge arm switch 125 and a lower bridge arm switch 126 in the W-phase bridge arm.

[0058] The motor 130 may specifically include: a winding 131 connected to the U-phase bridge arm, a winding 132 connected to the V-phase bridge arm, and a winding 133 connected to the W-phase bridge arm. One end of winding 131 is connected to the connection point between the upper and lower bridge arms of the U-phase bridge arm; one end of winding 132 is connected to the connection point between the upper and lower bridge arms of the C-phase bridge arm; and one end of winding 133 is connected to the connection point between the upper and lower bridge arms of the W-phase bridge arm. The other ends of windings 131, 132, and 133 are connected together.

[0059] It should be noted that the motor 130 is not limited to a three-phase motor, but can also be a six-phase motor, etc. Correspondingly, the switch module 120 may include a six-phase bridge arm.

[0060] In some embodiments, the heating system 100 further includes a motor controller 140, which modulates current by periodically switching switches in the switching module 120. For example, the motor controller 140 modulates current by periodically switching target upper arm switches and target lower arm switches in the inverter. In one example, if the target upper arm switch is upper arm switch 121, then the target lower arm switch is lower arm switch 124 and / or lower arm switch 126. In another example, if the target upper arm switch is upper arm switch 123, then the target lower arm switch is lower arm switch 122 and / or lower arm switch 126. In yet another example, if the target upper arm switch is upper arm switch 125, then the target lower arm switch is 122 and / or lower arm switch 124.

[0061] It should be noted that the target upper arm switch and target lower arm switch can be the same or different in each cycle, and this is not limited here. For example, the upper arm switch 121 and the lower arm switch 124 can be turned on and off in each cycle. Or, for example, in the first cycle, the upper arm switch 121 and the lower arm switch 124 can be turned on and off; in the second cycle, the upper arm switch 123 and the lower arm switch 122 can be turned on and off; and in the third cycle, the upper arm switch 121, the lower arm switch 124, and the lower arm switch 126 can be turned on and off. That is, the target upper arm switch and lower arm switch can be different in different cycles.

[0062] By periodically turning the target upper arm switch and the target lower arm switch on and off, the current directions in the different circuits formed between the power supply module, the target upper arm switch, the target lower arm switch, and the motor windings are different, thus generating pulse current, that is, charging the motor windings from the power supply module and discharging the motor windings from the power supply module.

[0063] The target switching device includes at least one upper bridge arm switch and at least one lower bridge arm switch, with the at least one upper bridge arm switch and at least one lower bridge arm switch located on different bridge arms.

[0064] Optionally, Figure 1 The heating system 100 of the battery shown also includes a capacitor C connected in parallel with the power supply module 110, which mainly serves to stabilize voltage and filter out noise.

[0065] As mentioned above, in adopting Figure 1 When the heating system 100 heats the battery, if the required pulse current frequency is f, the switching frequency of the switching module 120 also needs to reach f. In other words, the switching module 120 needs to switch once for every change in the direction of the pulse current. This results in relatively high losses in the three parts of the switching module 120: turn-on loss, turn-off loss, and drive loss. The temperature rise of the motor controller 140 will also be relatively high, increasing the overall difficulty of heat dissipation.

[0066] In view of this, embodiments of this application provide a control method for a battery heating system. This method alternately controls a switching module to a first switching state and a second switching state. In both the first and second switching states, the energy storage module first discharges to the power supply module, and then the power supply module charges the energy storage module, thereby generating heat to heat the battery. This control method achieves a switching frequency of f / 2 for the switching module, allowing the pulse current frequency to reach f. Therefore, it can extend the service life of the switching module and significantly reduce the temperature rise of the motor controller.

[0067] Figure 2A schematic block diagram of a control method 200 for a battery heating system according to an embodiment of this application is shown. The heating system may include an energy storage module, a switching module, and a power supply module. Figure 2 As shown, the control method 200 can be executed by a motor controller. Furthermore, the control method 200 can also be executed in conjunction with a battery management system (BMS) and / or a vehicle control unit (VCU). Specifically, the control method 200 may include the following.

[0068] S210, alternately control the switch module to be in a first switch state during a first duration and in a second switch state during a second duration, both the first duration and the second duration being 2T.

[0069] In the first switching state, a first circuit is formed between the power supply module, the switching module, and the energy storage module. During the first half of the first duration T, the energy storage module discharges to the power supply module through the first circuit, and during the second half of the first duration T, the power supply module charges the energy storage module through the first circuit. In the second switching state, a second circuit is formed between the power supply module, the switching module, and the energy storage module. During the first half of the second duration T, the energy storage module discharges to the power supply module through the second circuit, and during the second half of the second duration T, the power supply module charges the energy storage module through the second circuit. The second circuit is different from the first circuit.

[0070] The heating system used in the control method 200 can be... Figure 1 The heating system 100 shown. Specifically, the power supply module can be... Figure 1 The power supply module 110 is shown. For example, this power supply module can be the battery itself, or it can be other energy storage batteries or DC power supplies. The energy storage module can be... Figure 1 The windings in the motor 130 shown. This switching module can be... Figure 1 The switch module 120 shown.

[0071] Optionally, the energy storage module can be a motor winding or an inductor independent of the motor. In other words, the heating system to which the control method provided in this application applies may not use a drive motor found in electric vehicles or other electrical devices, thus allowing the battery to be heated during the operation of the electrical device.

[0072] In addition, as shown above, the switch module can have multiple switches. Different switch states refer to different closed switches in the switch module, which results in different circuits formed between the power supply module, the switch module, and the energy storage module. In other words, the first circuit and the second circuit are different, that is, the first switch state and the second switch state are different.

[0073] It should be noted that the energy storage module in the heating system needs to have initial energy before executing the control method 200. That is, the energy storage module must have the conditions to discharge to the power supply module before executing the control method 200. This ensures that when the control method 200 is executed, whether in the first switching state or the second switching state, the energy storage module can discharge to the power supply module for the first half of its duration.

[0074] In this embodiment, the duration of the first switching state and the duration of the second switching state are each divided into two parts, that is, the duration 2T is divided into a first half time T and a second half time T. During the first half time T, the energy storage module discharges to the power supply module, and during the second half time T, the power supply module charges the energy storage module, thereby generating energy to heat the battery. It should be understood that during the first half time T, the energy storage module needs to release its initial stored energy to zero, and during the second half time T, the energy storage module needs to be charged back to its initial energy. Therefore, by controlling the switching module to alternate between the first and second switching states, a switching between discharging from the energy storage module to the power supply module and charging from the power supply module to the energy storage module can be formed, that is, the pulse current described above is formed, thereby generating heat to heat the battery.

[0075] It should be understood that although pulse currents can be generated in both the first and second switching states, allowing the energy storage module to discharge to the power supply module and the power supply module to charge the energy storage module, without switching the switching states, the current will not automatically switch from charging the energy storage module to discharging back to the power supply module after charging. Therefore, the heat generated to heat the battery will not continue to be produced. In other words, the switching state switching in this embodiment is to change the direction of the pulse current from charging the energy storage module to discharging it back to the power supply module.

[0076] Therefore, the battery heating system control method provided in this application embodiment can heat the battery by generating pulse currents that discharge from the energy storage module to the power supply module and charge from the power supply module to the energy storage module. Furthermore, by controlling the switch module to switch between a first switch state and a second switch state, and generating pulse currents that discharge from the energy storage module to the power supply module and charge from the power supply module to the energy storage module in each switch state, the switching frequency of the switch module can be f / 2, and the frequency of the pulse current can be f. Therefore, the service life of the switch module can be extended, and the temperature rise of the motor controller can be significantly reduced.

[0077] Optionally, such as Figure 3 As shown, the control method 200 further includes: S220, before alternately controlling the switching module to be in a first switching state during a first duration and in a second switching state during a second duration, controlling the switching module to be in a third switching state during a third duration, the third duration being T; in the third switching state, a third loop is formed between the power supply module, the switching module, and the energy storage module, and during the third duration, the power supply module charges the energy storage module through the third loop, the third loop being different from the next loop of the third loop. In the above optional embodiments, the next loop can be the loop formed by the power supply module, the switching module, and the energy storage module when the switching module switches from the third switching state to another switching state. That is, when the switching module changes from the third switching state to another switching state, the loop formed by the power supply module, the switching module, and the energy storage module in that other switching state is the next loop of the third loop, and the other switching state refers to a switching state different from the third switching state.

[0078] As mentioned above, before executing the control method 200, the energy storage module in the heating system needs to have initial energy. Further, this initial energy can be obtained by controlling the switching module to charge the energy storage module before the switching module alternates between the first and second switching states. Specifically, the switching module can be controlled to be in a third switching state, forming a third circuit different from the first or second circuit. To ensure that the initial energy stored in the energy storage module is released to zero within the first half of the aforementioned duration 2T, the duration of the third switching state can be set to T. That is, during the duration T of the third switching state, the energy storage module is charged to its initial energy.

[0079] In this embodiment, by controlling the switch module to be in a third switch state before alternating between the first and second switch states, and setting the duration of the third switch state to T, the power supply module can be controlled to charge the energy storage module to its initial energy. This allows for the generation of pulse currents during the alternating second and third switch states for a duration of 2T, resulting in the energy storage module discharging to the power supply module and the power supply module charging the energy storage module. This generates heat to heat the battery, enabling the switch module to switch at a frequency of f / 2 and the pulse current to have a frequency of f. Consequently, the lifespan of the switch module can be extended, and the temperature rise of the motor controller can be significantly reduced.

[0080] Optionally, in this embodiment, the next circuit of the third circuit is the first circuit, and the third circuit is the same as the second circuit; or, the next circuit of the third circuit is the second circuit, and the third circuit is the same as the first circuit.

[0081] Therefore, if the switch module switches from the third switch state to the first switch state, the third switch state is the same as the second switch state and different from the first switch state; if the switch module switches from the third switch state to the second switch state, the third switch state is the same as the first switch state and different from the second switch state.

[0082] In this embodiment, since the switching of the switch state is only to prevent the power supply module from continuously charging the energy storage module, setting the third circuit to be the same as the non-adjacent circuit can reduce the control complexity of the heating system. In addition, it is also beneficial to balance the utilization rate of each switch in the switching module.

[0083] Optionally, the third circuit is different from both the first and second circuits. That is, the third switch state is different from both the first and second switch states.

[0084] Optionally, such as Figure 3The control method 200 further includes: S230, after alternately controlling the switching module to be in a first switching state for a first duration and in a second switching state for a second duration, controlling the switching module to be in a fourth switching state for a fourth duration, the fourth duration being T; after controlling the switching module to be in the fourth switching state, controlling all switches in the switching module to be disconnected to stop heating the battery; wherein, in the fourth switching state, a fourth circuit is formed between the power supply module, the switching module, and the energy storage module, and during the fourth duration, the energy storage module discharges to the power supply module through the fourth circuit, and the fourth circuit is different from the preceding circuit. In the above optional embodiment, the preceding circuit is the circuit formed by the power supply module, the switching module, and the energy storage module in another switching state when the switching module switches to the fourth switching state. That is, when the switching module switches from another switching state to the fourth switching state, the circuit formed by the power supply module, the switching module, and the energy storage module in that other switching state is the preceding circuit of the fourth circuit.

[0085] Specifically, when it is necessary to stop heating the battery, regardless of whether the switching module is in the first or second switching state, the power supply module charges the energy storage module for the latter half of the duration 2T. After the first or second switching state, the switching module switches to the fourth switching state to control the energy storage module to discharge to the power supply module. Furthermore, the duration of this fourth switching state can be set to T, during which the energy of the energy storage module can be released to 0. After the energy of the energy storage module is released to 0, all switches in the switching module are disconnected, so that no circuit is formed between the power supply module, the switching module, and the energy storage module, at which point heating ends.

[0086] Optionally, if the preceding circuit of the fourth circuit is the first circuit, then the fourth circuit is different from the first circuit; if the preceding circuit of the fourth circuit is the second circuit, then the fourth circuit is different from the second circuit. In other words, if the switch module switches from the first switch state to the fourth switch state, then the fourth switch state is different from the first switch state; if the switch module switches from the second switch state to the fourth switch state, then the fourth switch state is different from the second switch state.

[0087] In this embodiment, when the battery heating stops, after the control switch module alternately switches between the first switch state and the second switch state, the control switch module is in the fourth switch state, and the duration of the fourth switch state is set to T. This allows the energy stored by the power supply module charging the energy storage module in the second switch state or the third switch state to be released to 0, so that the current of the energy storage module can be 0, thereby avoiding damage to the switch module due to electrical stress.

[0088] Optionally, in this embodiment, the preceding circuit of the fourth circuit is the first circuit, and the fourth circuit is the same as the second circuit; or, the preceding circuit of the fourth circuit is the second circuit, and the fourth circuit is the same as the first circuit.

[0089] In other words, if the switch module switches from the first switch state to the fourth switch state, then the fourth switch state is the same as the second switch state; if the switch module switches from the second switch state to the fourth switch state, then the fourth switch state is the same as the first switch state.

[0090] In this embodiment, since the switching of the switch state is only to prevent the power supply module from continuously charging the energy storage module, setting the fourth circuit to be the same as the non-adjacent circuit can reduce the control complexity of the heating system. In addition, it is also beneficial to balance the utilization rate of each switch in the switching module.

[0091] In other words, during the entire control method 200 process, the switching module can switch between only two switching states, except that the duration of the initial switching state and the final switching state is half the duration of the intermediate switching state.

[0092] Optionally, the fourth circuit is different from both the first and second circuits. That is, the fourth switch state is different from both the first and second switch states.

[0093] Optionally, in other embodiments, the switching state may be different for each transition during the entire control method 200. Figure 1 For example, in the first switch state, upper bridge arm switch 121 and lower bridge arm switch 124 are closed, while upper bridge arm switches 123, 125, 122, and 126 are open. In the second switch state, upper bridge arm switches 123 and 126 are closed, while upper bridge arm switches 121, 125, 122, and 124 are open. In the third switch state, upper bridge arm switches 121, 125, and 124 are closed, while upper bridge arm switches 123, 122, and 126 are open. In the fourth switch state, upper bridge arm switches 121, 123, and 126 are closed, while upper bridge arm switches 125, 122, and 124 are open. As long as the switching state can achieve the switching of the pulse current direction from charging the energy storage module from the power supply module to discharging the energy storage module, the embodiments of this application are not limited in this respect.

[0094] Optionally, in this embodiment, the energy storage module includes multiple windings and at least one inductor in the first motor, and the switching module includes a first bridge arm group and a second bridge arm group. Each bridge arm in the first bridge arm group and the second bridge arm group includes an upper bridge arm and a lower bridge arm. The connection points of the upper and lower bridge arms of each bridge arm in the first bridge arm group are connected one-to-one with each of the multiple windings. The connection points of the upper and lower bridge arms of each bridge arm in the second bridge arm group are connected one-to-one with each of the at least one inductor. The multiple windings are at least some of the windings in the first motor, and both the first bridge arm group and the second bridge arm group are connected in parallel to the power supply module.

[0095] S210, alternately controlling the switching module to be in a first switching state during a first duration and in a second switching state during a second duration, specifically including: alternately controlling all lower bridge arms in the first bridge arm group to be turned on, all upper bridge arms in the first bridge arm group to be turned off, all upper bridge arms in the second bridge arm group to be turned on and all lower bridge arms in the second bridge arm group to be turned off, and all upper bridge arms in the first bridge arm group to be turned on, all lower bridge arms in the first bridge arm group to be turned off, all lower bridge arms in the second bridge arm group to be turned on and all upper bridge arms in the second bridge arm group to be turned off; wherein, in the first switching state, a first circuit is formed between the power supply module, all lower bridge arms in the first bridge arm group, the plurality of windings, the at least one inductor, and all upper bridge arms in the second bridge arm group; in the second switching state, a second circuit is formed between the power supply module, all upper bridge arms in the first bridge arm group, the plurality of windings, the at least one inductor, and all lower bridge arms in the second bridge arm group.

[0096] The embodiments of this application do not limit the order of the first switch state and the second switch state. That is, the switch module can be in the first switch state first and then in the second switch state, or the switch module can be in the second switch state first and then in the first switch state.

[0097] In one example, within the architecture of this heating system, the first switching state can be all lower arms in the first arm group turned on, all upper arms in the first arm group turned off, all upper arms in the second arm group turned on, and all lower arms in the second arm group turned off. The second switching state can be all upper arms in the first arm group turned on, all lower arms in the first arm group turned off, all upper arms in the second arm group turned off, and all lower arms in the second arm group turned on.

[0098] In another example, under the architecture of this heating system, the first switching state can be all upper bridge arms in the first bridge arm group turned on, all lower bridge arms in the first bridge arm group turned off, all upper bridge arms in the second bridge arm group turned off, and all lower bridge arms in the second bridge arm group turned on. The second switching state can be all lower bridge arms in the first bridge arm group turned on, all upper bridge arms in the first bridge arm group turned off, all upper bridge arms in the second bridge arm group turned on, and all lower bridge arms in the second bridge arm group turned off.

[0099] In this embodiment, the energy storage module reuses the motor windings in the electrical device, which can reduce the cost of heating the battery of the electrical device.

[0100] Taking a three-phase motor as an example, the magnetomotive force (MOF) of a single-phase winding is a pulsating MOF that is spatially distributed in a stepped manner and changes with time according to the current variation. The superposition of the MOFs of the three single-phase windings in a three-phase motor constitutes the combined magnetic field of the three-phase windings. Typically, in traditional heating systems, the currents flowing through the three-phase windings of a three-phase motor during heating are not completely equal in magnitude. The currents flowing through two of the windings are 180° out of phase, meaning the currents in the two phases without a phase difference are equal in magnitude. This leads to an asymmetry between the three phases of the current flowing through the motor windings, and the high current frequency causes significant motor vibration and noise during the heating process.

[0101] Therefore, the heating system in the embodiments of this application is Figure 1 The heating system 100 shown has been improved. By controlling the switch module, a circuit is formed between the power supply module, the switch module, the motor winding and at least one inductor. The combined magnetic field of the current flowing through the motor winding is controlled to be 0 to 0.5T, which can effectively reduce the problem of excessive motor vibration and noise during the process of heating the power battery using the motor circuit.

[0102] In one example, the plurality of windings are all the windings in the first motor, and the at least one inductor is an external inductor independent of the first motor, and the at least one inductor is connected to the neutral point of the first motor.

[0103] Optionally, the inductance of the external inductor can be 0H, meaning that the external inductor can also be replaced by an external wire.

[0104] Optionally, the current flowing through the multiple windings of the first motor can be made equal in magnitude and phase by controlling the switching module.

[0105] In this embodiment, by controlling the switching module, the current flowing through all windings of the first motor is made equal in magnitude and phase, thereby effectively suppressing the vibration and noise generated by the first motor when heating the power battery using the first motor circuit. Simultaneously, it can prevent the first motor from operating, thus solving the problem of rotor overheating in the motor and extending the battery's self-heating lifespan.

[0106] In another example, the plurality of windings are all the windings in a first motor, the at least one inductor is all the windings in a second motor, and the neutral point of the first motor is connected to the neutral point of the second motor.

[0107] Optionally, the current flowing through the multiple windings of the first motor can be made equal in magnitude and phase, and the current flowing through the multiple windings of the second motor can be made equal in magnitude and phase, by controlling the switching module.

[0108] In this embodiment, by controlling the switching module, the current flowing through all windings of the first motor is equal in magnitude and phase, and the current flowing through all windings of the second motor is also equal in magnitude and phase. This effectively suppresses motor vibration noise when the circuits of the first and second motors are used to heat the power battery. Furthermore, the heating system provided in this application can also cause the first and second motors to operate, solving the problem of rotor overheating in the motors and thus extending the battery's self-heating lifespan.

[0109] In another example, the first motor is a six-phase motor, the plurality of windings are three of the six-phase motor windings, the at least one inductor is another three of the six-phase motor windings, and the spatial phase difference between the three windings is 120°.

[0110] In this embodiment, by controlling the spatial phase difference between three windings of the six-phase motor and the spatial phase difference between the current flowing through the other three windings of the six-phase motor to be 120°, the vibration noise of the motor can be effectively suppressed when the circuit of the six-phase motor is used to heat the power battery. Furthermore, the heating system provided in this application can also cause the motor to run, thereby solving the problem of rotor overheating in the motor and extending the battery's self-heating lifespan.

[0111] In other examples, the first motor is a three-phase motor and the second motor is a six-phase motor. The energy storage module may include three windings of the first motor and six windings of the second motor. Alternatively, the energy storage module may also include three windings of the first motor and three windings of the second motor, as long as the spatial phase difference between the three windings of the second motor in the circuit is 120°.

[0112] Optionally, in this embodiment of the application, controlling the switch module to be in the fourth switching state during the fourth duration includes: when it is determined that heating of the battery will stop, controlling the switch module to be in the fourth switching state during the fourth duration.

[0113] In this embodiment, once it is determined that heating of the battery has stopped, the switch module can be controlled to the fourth switch state, which can release the energy stored in the energy storage module to 0, thereby avoiding damage to the switch module due to electrical stress.

[0114] Optionally, in this embodiment of the application, the control method 200 further includes: determining whether to stop heating the battery based on the temperature of the battery.

[0115] During the process of heating the battery using a heating system, the battery temperature can be monitored in real time. When the battery temperature rises to a level where it can be charged, the heating process can be stopped.

[0116] For example, when the VCU receives a heating request from the BMS, the VCU can send a first control signal to the motor controller. This first control signal instructs the motor controller to drive the switching module to switch between the various switching states mentioned above. When the BMS determines that the battery temperature has reached the required level, it sends a heating stop request to the VCU. The VCU can then send a second control signal to the motor controller, instructing the heating of the battery to stop. This second control signal instructs the motor controller to drive all switches in the switching module to open.

[0117] In this embodiment, the system determines whether to stop heating the battery based on its temperature, enabling timely control of the charging device to charge the battery and thus improving charging efficiency.

[0118] Optionally, in this embodiment of the application, the control method 200 further includes: determining the first duration and / or the second duration based on the temperature and / or state of charge (SOC) of the battery.

[0119] Specifically, when it is determined that battery heating is required, a battery heating request can be obtained. This heating request may include the frequency of the pulse current, which is the frequency at which the power supply module charges the energy storage module and the energy storage module discharges to the power supply module, as described in this paper. This frequency can be dynamically adjusted according to the battery's temperature and / or SOC. More specifically, a pulse current frequency requirement corresponding to different temperatures and different SOCs can be built into the BMS or VCU. This pulse current frequency requirement refers to the minimum frequency at which the power supply module charges the energy storage module and the energy storage module discharges to the power supply module. Furthermore, upon obtaining this pulse current frequency requirement, the frequency of the pulse current can be determined. Since the frequency of this pulse current is twice the switching frequency of the first and second switching states, the first duration and the second duration can be determined.

[0120] In this embodiment, dynamically adjusting the first duration and / or the second duration based on the battery temperature and / or SOC is beneficial for improving the efficiency of battery heating.

[0121] The following will combine Figures 4 to 6 Schematic circuit diagrams of three heating systems applicable to the embodiments of this application are described in detail.

[0122] Figure 4 A schematic circuit diagram of a heating system 300 is shown. (For example...) Figure 4 As shown, the heating system 300 includes a power supply module 310, a switch module 320, a motor 330, and an inductor 340.

[0123] The power supply module 310 can be a power battery, an energy storage battery, or other DC power source. The switch module 320 includes a first bridge arm 321, a second bridge arm 322, a third bridge arm 323, and a fourth bridge arm 324. Each bridge arm in the switch module 320 includes an upper bridge arm and a lower bridge arm. For example, the first bridge arm 321 includes an upper bridge arm 3211 and a lower bridge arm 3212, the second bridge arm 322 includes an upper bridge arm 3221 and a lower bridge arm 3222, the third bridge arm 323 includes an upper bridge arm 3231 and a lower bridge arm 3232, and the fourth bridge arm 324 includes an upper bridge arm 3241 and a lower bridge arm 3242. The motor 330 includes windings 331, 332, and 333, and the inductor 340 is an external inductor independent of the motor 330.

[0124] like Figure 4As shown, the connection point of the upper bridge arm 3211 and the lower bridge arm 3212 of the first bridge arm 321 is connected to one end of the winding 331; the connection point of the upper bridge arm 3221 and the lower bridge arm 3222 of the second bridge arm 322 is connected to one end of the winding 332; the connection point of the upper bridge arm 3231 and the lower bridge arm 3232 of the third bridge arm 323 is connected to one end of the winding 333; the connection point of the upper bridge arm 3241 and the lower bridge arm 3242 of the fourth bridge arm 324 is connected to one end of the inductor 340; and the other ends of the winding 331, the winding 332, the winding 333, and the inductor 340 are connected together.

[0125] Optionally, when the power supply module 310 is a battery, the heating system 300 may further include relays K1 and K2, wherein the closing and opening of relays K1 and K2 can control the high voltage power supply of the electrical device. The heating system 300 may further include a pre-charge resistor R and a pre-charge relay K3, wherein the pre-charge of the battery can be completed by controlling the closing and opening of the pre-charge relay K3.

[0126] Optionally, such as Figure 4 As shown, the heating system 300 may also include relays K4 and / or K7. When the fourth bridge arm 324 fails, disconnecting relay K4 ensures that the motor controller can normally control the electrical device. The presence of relay K7 allows an external power supply to be connected to the left side of relay K7, and by disconnecting relay K7, in conjunction with the windings of motor 330, the external power supply can be boosted or bucked to charge the battery.

[0127] Figure 5 A schematic circuit diagram of another heating system 400 is shown. (e.g.) Figure 5 As shown, the heating system 400 may include a power supply module 410, a switch module 420, a first motor 430, and a second motor 440.

[0128] The power supply module 410 can be a power battery, an energy storage battery, or other DC power source. The switch module 420 includes a first bridge arm 421, a second bridge arm 422, a third bridge arm 423, a fourth bridge arm 424, a fifth bridge arm 425, and a sixth bridge arm 426. Each bridge arm in the switch module 420 includes an upper bridge arm and a lower bridge arm. For example, the first bridge arm 421 includes an upper bridge arm 4211 and a lower bridge arm 4212, the second bridge arm 422 includes an upper bridge arm 4221 and a lower bridge arm 4222, the third bridge arm 423 includes an upper bridge arm 4231 and a lower bridge arm 4232, the fourth bridge arm 424 includes an upper bridge arm 4241 and a lower bridge arm 4242, the fifth bridge arm 425 includes an upper bridge arm 4251 and a lower bridge arm 4252, and the sixth bridge arm 426 includes an upper bridge arm 4261 and a lower bridge arm 4262. The first motor 430 includes windings 431, 432 and 433, and the second motor 440 includes windings 441, 442 and 443.

[0129] like Figure 5 As shown, the connection points of the upper bridge arm 4211 and the lower bridge arm 4212 of the first bridge arm 421 are connected to one end of the winding 431; the connection points of the upper bridge arm 4221 and the lower bridge arm 4222 of the second bridge arm 422 are connected to one end of the winding 432; the connection points of the upper bridge arm 4231 and the lower bridge arm 4232 of the third bridge arm 423 are connected to one end of the winding 433; and the connection points of the upper bridge arm 4241 and the lower bridge arm 4242 of the fourth bridge arm 424 are connected to one end of the winding 433. One end of 41 is connected, the connection point of the upper bridge arm 4251 and the lower bridge arm 4252 of the fifth bridge arm 425 is connected to one end of the winding 442, the connection point of the upper bridge arm 4261 and the lower bridge arm 4262 of the sixth bridge arm 426 is connected to one end of the winding 443, and the other ends of the winding 431, the winding 432, the winding 433, the winding 441, the winding 442 and the winding 443 are connected together.

[0130] Figure 6 A schematic circuit diagram of a reheating system 500 is shown. (For example...) Figure 6 As shown, the heating system 500 may include a power supply module 510, a switch module 520, and a six-phase motor 530.

[0131] The power supply module 510 can be a power battery, an energy storage battery, or other DC power source. The switch module 520 includes a first bridge arm 521, a second bridge arm 522, a third bridge arm 523, a fourth bridge arm 524, a fifth bridge arm 525, and a sixth bridge arm 526. Each bridge arm in the switch module 520 includes an upper bridge arm and a lower bridge arm. For example, the first bridge arm 521 includes an upper bridge arm 5211 and a lower bridge arm 5212, the second bridge arm 522 includes an upper bridge arm 5221 and a lower bridge arm 5222, the third bridge arm 523 includes an upper bridge arm 5231 and a lower bridge arm 5232, the fourth bridge arm 524 includes an upper bridge arm 5241 and a lower bridge arm 5242, the fifth bridge arm 525 includes an upper bridge arm 5251 and a lower bridge arm 5252, and the sixth bridge arm 526 includes an upper bridge arm 5261 and a lower bridge arm 5262. The six-phase motor 530 includes windings 531, 532, 533, 534, 535 and 536.

[0132] like Figure 6 As shown, the connection points of the upper bridge arm 5211 and the lower bridge arm 5212 of the first bridge arm 521 are connected to one end of the winding 531; the connection points of the upper bridge arm 5221 and the lower bridge arm 5222 of the second bridge arm 522 are connected to one end of the winding 532; the connection points of the upper bridge arm 5231 and the lower bridge arm 5232 of the third bridge arm 523 are connected to one end of the winding 533; and the connection points of the upper bridge arm 5251 and the lower bridge arm 5252 of the fourth bridge arm 525 are connected to one end of the winding 533. One end of 34 is connected, the connection point of the upper bridge arm 5251 and the lower bridge arm 5252 of the fifth bridge arm 525 is connected to one end of the winding 535, the connection point of the upper bridge arm 5261 and the lower bridge arm 5262 of the sixth bridge arm 526 is connected to one end of the winding 536, and the other ends of the winding 531, the winding 532, the winding 533, the winding 534, the winding 535 and the winding 534 are connected together.

[0133] Optionally, Figures 4 to 6 The heating system of the battery shown also includes a capacitor C connected in parallel with the power supply module, which mainly serves to stabilize voltage and filter out noise.

[0134] The following will introduce the adoption of... Figures 4 to 6 The heating system controls the battery heating process. This control process includes processes 1, 2, 3, and 4 sequentially. Processes 1 and 4 are executed only once, while processes 2 and 3 are executed alternately. Specifically, Figures 7 to 12 Corresponding to Figure 4 The heating system 300 shown is... Figures 13 to 18 Corresponding to Figure 5 The heating system 400 shown is... Figures 19 to 24 Corresponding to Figure 6 The heating system 500 shown.

[0135] Figure 4 The heating process of the battery by the heating system 300 shown may specifically include the following:

[0136] In process 1, the upper bridge arm 3211 of the first bridge arm 321, the upper bridge arm 3221 of the second bridge arm 322, the upper bridge arm 3231 of the third bridge arm 323, and the lower bridge arm 3242 of the fourth bridge arm 324 are closed, while the lower bridge arm 3212 of the first bridge arm 321, the lower bridge arm 3222 of the second bridge arm 322, the lower bridge arm 3232 of the third bridge arm 323, and the upper bridge arm 3241 of the fourth bridge arm 324 are disconnected, forming a circuit between the power supply module 310, the upper bridge arm 3211 of the first bridge arm 321, the upper bridge arm 3221 of the second bridge arm 322, the upper bridge arm 3231 of the third bridge arm 323, the motor 330, the inductor 340, and the lower bridge arm 3242 of the fourth bridge arm 324. The power supply module 310 charges the windings and inductor 340 in the motor 330 through this circuit, with the current direction being: 310(+)→(3211 / 3221 / 3231)→(331 / 332 / 333)→(340)→(3242)→310(-), as follows. Figure 7 As shown.

[0137] In process 2, the upper bridge arm 3211 of the first bridge arm 321, the upper bridge arm 3221 of the second bridge arm 322, the upper bridge arm 3231 of the third bridge arm 323, and the lower bridge arm 3242 of the fourth bridge arm 324 are disconnected, and the lower bridge arm 3212 of the first bridge arm 321, the lower bridge arm 3222 of the second bridge arm 322, the lower bridge arm 3232 of the third bridge arm 323, and the upper bridge arm 3241 of the fourth bridge arm 324 are closed, forming a circuit between the power supply module 310, the lower bridge arm 3212 of the first bridge arm 321, the lower bridge arm 3222 of the second bridge arm 322, the lower bridge arm 3232 of the third bridge arm 323, the first motor 330, the inductor 340, and the upper bridge arm 3241 of the fourth bridge arm 324.

[0138] Since the duration of process 2 is twice that of process 1, the current direction will switch during process 2. Specifically, in the first half of process 2, the windings of motor 330 and inductor 340 discharge to power supply module 310, with the current direction as follows: 310(-)→(3212 / 3222 / 3232)→(331 / 332 / 333)→(340)→(3241)→310(+), as shown below. Figure 8 As shown; in the latter half of process 2, the power supply module 310 charges the windings of the motor 330 and the inductor 340, with the current direction being: 310(+)→(3212 / 3222 / 3232)→(331 / 332 / 333)→(340)→(3241)→310(-), as Figure 9 As shown.

[0139] In process 3, the upper bridge arm 3211 of the first bridge arm 321, the upper bridge arm 3221 of the second bridge arm 322, the upper bridge arm 3231 of the third bridge arm 323, and the lower bridge arm 3242 of the fourth bridge arm 324 are closed, while the lower bridge arm 3212 of the first bridge arm 321, the lower bridge arm 3222 of the second bridge arm 322, the lower bridge arm 3232 of the third bridge arm 323, and the upper bridge arm 3241 of the fourth bridge arm 324 are disconnected, forming a circuit between the power supply module 310, the upper bridge arm 3211 of the first bridge arm 321, the upper bridge arm 3221 of the second bridge arm 322, the upper bridge arm 3231 of the third bridge arm 323, the first motor 330, the inductor 340, and the lower bridge arm 3242 of the fourth bridge arm 324.

[0140] Similar to process 2, since the duration of process 3 is twice that of process 1, the current direction will switch in process 3. Specifically, in the first half of process 2, the windings of motor 330 and inductor 340 discharge to power supply module 310, and the current direction is: 310(-)→(3211 / 3221 / 3231)→(331 / 332 / 333)→(340)→(3242)→310(+), as follows. Figure 10 As shown; in the latter half of process 2, the power supply module 310 charges the windings of the motor 330 and the inductor 340, with the current direction being: 310(+)→(3211 / 3221 / 3231)→(331 / 332 / 333)→(340)→(3242)→310(-), as Figure 11 As shown.

[0141] In process 4, the upper bridge arm 3211 of the first bridge arm 321, the upper bridge arm 3221 of the second bridge arm 322, the upper bridge arm 3231 of the third bridge arm 323, and the lower bridge arm 3242 of the fourth bridge arm 324 are disconnected, and the lower bridge arm 3212 of the first bridge arm 321, the lower bridge arm 3222 of the second bridge arm 322, the lower bridge arm 3232 of the third bridge arm 323, and the upper bridge arm 3241 of the fourth bridge arm 324 are closed, forming a circuit between the power supply module 310, the lower bridge arm 3212 of the first bridge arm 321, the lower bridge arm 3222 of the second bridge arm 322, the lower bridge arm 3232 of the third bridge arm 323, the first motor 330, the inductor 340, and the upper bridge arm 3241 of the fourth bridge arm 324. The windings and inductor 340 in motor 330 discharge to power supply module 310 through this circuit, with the current direction being: 310(-)→(3212 / 3222 / 3232)→(331 / 332 / 333)→(340)→(3241)→310(+), as follows. Figure 12 As shown.

[0142] Figure 5 The heating process of the battery by the heating system 400 shown may specifically include the following:

[0143] Process 1: Control the upper arm 4211 of the first bridge arm 421, the upper arm 4221 of the second bridge arm 422, the upper arm 4231 of the third bridge arm 423, the lower arm 4242 of the fourth bridge arm 424, the lower arm 4252 of the fifth bridge arm 425, and the lower arm 4262 of the sixth bridge arm 426 to close, and the lower arm 4212 of the first bridge arm 421, the lower arm 4222 of the second bridge arm 422, the lower arm 4232 of the third bridge arm 423, and the upper arm 4242 of the fourth bridge arm 426 to close. 41. The upper arm 4251 of the fifth bridge arm 425 and the upper arm 4261 of the sixth bridge arm 426 are disconnected, forming a circuit between the power supply module 310, the upper arm 3211 of the first bridge arm 321, the upper arm 3221 of the second bridge arm 322, the upper arm 3231 of the third bridge arm 323, the first motor 430, the second motor 440, the lower arm 4242 of the fourth bridge arm 424, the lower arm 4252 of the fifth bridge arm 425, and the lower arm 4262 of the sixth bridge arm 426. The power supply module 410 charges the windings of the first motor 430 and the second motor 440 through this circuit, with the current direction being: 410(+)→(4211 / 4221 / 4231)→(431 / 432 / 433)→(4242 / 4252 / 4262)→(441 / 442 / 443)→410(-), as follows. Figure 13 As shown.

[0144] Process 2: Control the upper arm 4211 of the first bridge arm 421, the upper arm 4221 of the second bridge arm 422, the upper arm 4231 of the third bridge arm 423, the lower arm 4242 of the fourth bridge arm 424, the lower arm 4252 of the fifth bridge arm 425, and the lower arm 4262 of the sixth bridge arm 426 to disconnect, and disconnect the lower arm 4212 of the first bridge arm 421, the lower arm 4222 of the second bridge arm 422, the lower arm 4232 of the third bridge arm 423, and the upper arm 4242 of the fourth bridge arm 426. 41. The upper arm 4251 of the fifth bridge arm 425 and the upper arm 4261 of the sixth bridge arm 426 are closed to form a circuit between the power supply module 310, the lower arm 4212 of the first bridge arm 421, the lower arm 4222 of the second bridge arm 422, the lower arm 4232 of the third bridge arm 423, the first motor 430, the second motor 440, the upper arm 4241 of the fourth bridge arm 424, the upper arm 4251 of the fifth bridge arm 425, and the upper arm 4261 of the sixth bridge arm 426.

[0145] Since the duration of process 2 is twice the duration of process 1, the current direction will switch during process 2. Specifically, in the first half of process 2, the first motor 430 and the second motor 440 discharge to the power supply module 310, and the current direction is: 410(-)→(4212 / 4222 / 4232)→(431 / 432 / 433)→(4241 / 4251 / 4261)→(441 / 442 / 443)→410(+), as shown below. Figure 14 As shown; in the latter half of process 2, the power supply module 410 charges the first motor 430 and the second motor 440, with the current direction as follows: 410(+)→(4212 / 4222 / 4232)→(431 / 432 / 433)→(4241 / 4251 / 4261)→(441 / 442 / 443)→410(-), as... Figure 15 As shown.

[0146] Process 3: Control the upper arm 4211 of the first bridge arm 421, the upper arm 4221 of the second bridge arm 422, the upper arm 4231 of the third bridge arm 423, the lower arm 4242 of the fourth bridge arm 424, the lower arm 4252 of the fifth bridge arm 425, and the lower arm 4262 of the sixth bridge arm 426 to close, and the lower arm 4212 of the first bridge arm 421, the lower arm 4222 of the second bridge arm 422, the lower arm 4232 of the third bridge arm 423, and the upper arm 4242 of the fourth bridge arm 426 to close. 41. The upper arm 4251 of the fifth bridge arm 425 and the upper arm 4261 of the sixth bridge arm 426 are disconnected, forming a circuit between the power supply module 310, the upper arm 3211 of the first bridge arm 321, the upper arm 3221 of the second bridge arm 322, the upper arm 3231 of the third bridge arm 323, the first motor 430, the second motor 440, the lower arm 4242 of the fourth bridge arm 424, the lower arm 4252 of the fifth bridge arm 425, and the lower arm 4262 of the sixth bridge arm 426.

[0147] Similar to process 2, since the duration of process 3 is twice that of process 1, the current direction will switch in process 3. Specifically, in the first half of process 3, the first motor 430 and the second motor 440 discharge to the power supply module 310, and the current direction is: 410(-)→(4211 / 4221 / 4231)→(431 / 432 / 433)→(4242 / 4252 / 4262)→(441 / 442 / 443)→410(+), as shown below. Figure 16As shown; in the latter half of process 2, the power supply module 410 charges the first motor 430 and the second motor 440, with the current direction as follows: 410(+)→(4211 / 4221 / 4231)→(431 / 432 / 433)→(4242 / 4252 / 4262)→(441 / 442 / 443)→410(-), as... Figure 17 As shown.

[0148] Process 4: Control the upper arm 4211 of the first bridge arm 421, the upper arm 4221 of the second bridge arm 422, the upper arm 4231 of the third bridge arm 423, the lower arm 4242 of the fourth bridge arm 424, the lower arm 4252 of the fifth bridge arm 425, and the lower arm 4262 of the sixth bridge arm 426 to disconnect, and disconnect the lower arm 4212 of the first bridge arm 421, the lower arm 4222 of the second bridge arm 422, the lower arm 4232 of the third bridge arm 423, and the upper arm 4242 of the fourth bridge arm 426. 41. The upper arm 4251 of the fifth bridge arm 425 and the upper arm 4261 of the sixth bridge arm 426 are closed to form a circuit between the power supply module 310, the lower arm 4212 of the first bridge arm 421, the lower arm 4222 of the second bridge arm 422, the lower arm 4232 of the third bridge arm 423, the first motor 430, the second motor 440, the upper arm 4241 of the fourth bridge arm 424, the upper arm 4251 of the fifth bridge arm 425, and the upper arm 4261 of the sixth bridge arm 426. The first motor 430 and the second motor 440 discharge to the power supply module 410 through this circuit. The current direction is: 410(-)→(4212 / 3222 / 3232)→(431 / 332 / 333)→(4241 / 4251 / 4261)→(441 / 442 / 443)→410(+), as shown. Figure 18 As shown.

[0149] Figure 6 The heating process of the battery by the heating system 500 shown may specifically include the following:

[0150] Process 1: Control the upper arm 5211 of the first bridge arm 521, the upper arm 5221 of the second bridge arm 522, the upper arm 5231 of the third bridge arm 523, the lower arm 5242 of the fourth bridge arm 524, the lower arm 5252 of the fifth bridge arm 525, and the lower arm 5262 of the sixth bridge arm 526 to close, and the lower arm 5212 of the first bridge arm 521, the lower arm 5222 of the second bridge arm 522, the lower arm 5232 of the third bridge arm 523, the upper arm 5241 of the fourth bridge arm 524, and the lower arm 5262 of the sixth bridge arm 526 to close. The upper bridge arm 5251 of the fifth bridge arm and the upper bridge arm 5261 of the sixth bridge arm 526 are disconnected, forming a circuit between the power supply module 510, the upper bridge arm 5211 of the first bridge arm 521, the upper bridge arm 5221 of the second bridge arm 522, the upper bridge arm 5231 of the third bridge arm 523, the windings 531 to 533 in the motor 530, the windings 534 to 536 in the motor 530, the lower bridge arm 5242 of the fourth bridge arm 524, the lower bridge arm 5252 of the fifth bridge arm 525, and the lower bridge arm 5262 of the sixth bridge arm 526. The power supply module 510 charges the windings 531 to 536 in the motor 530 through this circuit, with the current direction being: 510(+)→(5211 / 5221 / 3231)→(531 / 532 / 533)→(5242 / 5252 / 5262)→(534 / 535 / 536)→510(-), as follows. Figure 19 As shown.

[0151] Process 2: Control the upper arm 5211 of the first bridge arm 521, the upper arm 5221 of the second bridge arm 522, the upper arm 5231 of the third bridge arm 523, the lower arm 5242 of the fourth bridge arm 524, the lower arm 5252 of the fifth bridge arm 525, and the lower arm 5262 of the sixth bridge arm 526 to disconnect, and disconnect the lower arm 5212 of the first bridge arm 521, the lower arm 5222 of the second bridge arm 522, the lower arm 5232 of the third bridge arm 523, the upper arm 5241 of the fourth bridge arm 524, and the lower arm 5262 of the sixth bridge arm 526. The upper bridge arm 5251 of bridge 5 and the upper bridge arm 5261 of the sixth bridge arm 526 are closed to form a circuit between the power supply module 510, the lower bridge arm 5212 of the first bridge arm 521, the lower bridge arm 5222 of the second bridge arm 522, the lower bridge arm 5232 of the third bridge arm 523, the windings 531 to 533 in the motor 530, the windings 534 to 536 in the motor 530, the upper bridge arm 5241 of the fourth bridge arm 524, the upper bridge arm 5251 of the fifth bridge arm 525, and the upper bridge arm 5261 of the sixth bridge arm 526.

[0152] Since the duration of process 2 is twice the duration of process 1, the current direction will switch during process 2. Specifically, in the first half of process 2, windings 531-533 and windings 534-536 of motor 530 discharge to power supply module 510, with the current direction as follows: 510(-)→(5212 / 5222 / 3232)→(531 / 532 / 533)→(5241 / 5251 / 5261)→(534 / 535 / 536)→510(+), as shown below. Figure 20 As shown; in the latter half of process 2, the power supply module 410 charges the windings 531-533 and 534-536 of the motor 530, with the current direction being: 510(+)→(5212 / 5222 / 3232)→(531 / 532 / 533)→(5241 / 5251 / 5261)→(534 / 535 / 536)→510(-), as Figure 21 As shown.

[0153] Process 3: Control the upper arm 5211 of the first bridge arm 521, the upper arm 5221 of the second bridge arm 522, the upper arm 5231 of the third bridge arm 523, the lower arm 5242 of the fourth bridge arm 524, the lower arm 5252 of the fifth bridge arm 525, and the lower arm 5262 of the sixth bridge arm 526 to close, and the lower arm 5212 of the first bridge arm 521, the lower arm 5222 of the second bridge arm 522, the lower arm 5232 of the third bridge arm 523, the upper arm 5241 of the fourth bridge arm 524, and the lower arm 5262 of the sixth bridge arm 526 to close. The upper bridge arm 5251 of the fifth bridge arm and the upper bridge arm 5261 of the sixth bridge arm 526 are disconnected, forming a circuit between the power supply module 510, the upper bridge arm 5211 of the first bridge arm 521, the upper bridge arm 5221 of the second bridge arm 522, the upper bridge arm 5231 of the third bridge arm 523, the windings 531 to 533 in the motor 530, the windings 534 to 536 in the motor 530, the lower bridge arm 5242 of the fourth bridge arm 524, the lower bridge arm 5252 of the fifth bridge arm 525, and the lower bridge arm 5262 of the sixth bridge arm 526.

[0154] Similar to process 2, since the duration of process 3 is twice that of process 1, the current direction will switch in process 3. Specifically, in the first half of process 3, the windings 531-533 and 534-536 of motor 530 discharge to the power supply module 510, and the current direction is: 510(-)→521(1 / 5221 / 3231)→(531 / 532 / 533)→(5242 / 5252 / 5262)→(534 / 535 / 536)→510(+), as shown below. Figure 22As shown; in the latter half of process 2, the power supply module 410 charges the windings 531-533 and 534-536 of the motor 530, with the current direction being: 510(+)→5211 / 5221 / 3231)→(531 / 532 / 533)→(5242 / 5252 / 5262)→(534 / 535 / 536)→510(-), as Figure 23 As shown.

[0155] Process 4: Control the upper arm 5211 of the first bridge arm 521, the upper arm 5221 of the second bridge arm 522, the upper arm 5231 of the third bridge arm 523, the lower arm 5242 of the fourth bridge arm 524, the lower arm 5252 of the fifth bridge arm 525, and the lower arm 5262 of the sixth bridge arm 526 to disconnect, and disconnect the lower arm 5212 of the first bridge arm 521, the lower arm 5222 of the second bridge arm 522, the lower arm 5232 of the third bridge arm 523, the upper arm 5241 of the fourth bridge arm 524, and the lower arm 5262 of the sixth bridge arm 526. The upper bridge arm 5251 of bridge 5 and the upper bridge arm 5261 of the sixth bridge arm 526 are closed to form a circuit between the power supply module 510, the lower bridge arm 5212 of the first bridge arm 521, the lower bridge arm 5222 of the second bridge arm 522, the lower bridge arm 5232 of the third bridge arm 523, the windings 531 to 533 in the motor 530, the windings 534 to 536 in the motor 530, the upper bridge arm 5241 of the fourth bridge arm 524, the upper bridge arm 5251 of the fifth bridge arm 525, and the upper bridge arm 5261 of the sixth bridge arm 526. The power supply module 510 is discharged through this circuit via windings 531-533 and windings 534-536 in motor 530. The current direction is: 510(-)→(5212 / 5222 / 3232)→(531 / 532 / 533)→(5241 / 5251 / 5261)→(534 / 535 / 536)→510(+). Figure 24 As shown.

[0156] Figure 25 The diagram illustrates the timing of the drive signal-pulse current under various switching states according to embodiments of this application. The drive signal refers to the signal that closes the switch in the drive switching module. The direction of the pulse current can refer to the direction of current flow in the motor inductor; for example, it could be... Figures 7 to 12 Motor 330 in Figures 13 to 18 The first motor 430 and Figures 19 to 24 The direction of current flow in windings 531-533 of motor 530 is as follows: Figure 25 In this context, the direction of current flow from left to right is positive. For example... Figure 25As shown, the frequency of the pulse current is twice the frequency of the drive signal. This means that the switching frequency in the switching module only needs to be f / 2 for the pulse current frequency to reach f. Since the entire battery heating process typically lasts more than 5 minutes, while the pulse current frequency is generally several hundred hertz, and processes 1 and 4 are executed only once, occupying no more than 1 second of the entire heating process—far less than the execution time of processes 2 and 3—this solution can reduce the switching module's losses to half that of traditional solutions, extend the switching module's lifespan, and significantly reduce the temperature rise of the motor controller.

[0157] Additionally, it should be noted that the above four processes also involve the dead time issue of the switching module. For example, when switching from process 2 to process 3, since the switching module needs some time to fully turn on after receiving the drive signal, the dead time is the period after process 2 ends when all switches in the switching module are turned off for a very short time (on the order of microseconds or nanoseconds) before process 3 is executed.

[0158] Figure 26 A schematic block diagram of a battery heating system 600 provided in an embodiment of this application is shown. Figure 26 As shown, the heating system 600 includes: an energy storage module 610, a switch module 620, a power supply module 630, and a control module 640; the control module 640 is used to: alternately control the switch module to be in a first switching state during a first duration and in a second switching state during a second duration, both the first and second durations being 2T; in the first switching state, a first circuit is formed between the power supply module, the switch module, and the energy storage module, and the energy storage module discharges from the energy storage module to the power supply module through the first circuit during the first half of the first duration T, and charges the energy storage module through the power supply module through the first circuit during the second half of the first duration T; in the second switching state, a second circuit is formed between the power supply module, the switch module, and the energy storage module, and the energy storage module discharges from the energy storage module to the power supply module through the second circuit during the first half of the second duration T, and charges the energy storage module through the power supply module through the second circuit during the second half of the second duration T, the second circuit being different from the first circuit.

[0159] Optionally, in this embodiment, the control module 640 is further configured to: control the switch module to be in a third switch state for a third duration, T, before alternately controlling the switch module to be in a first switch state during a first duration and in a second switch state during a second duration; in the third switch state, a third circuit is formed between the power supply module, the switch module, and the energy storage module; during the third duration, the power supply module charges the energy storage module through the third circuit; the third circuit is different from the next circuit of the third circuit, and the next circuit may be a circuit formed by the power supply module, the switch module, and the energy storage module in another switch state that the switch module switches from the third switch state.

[0160] Optionally, in this embodiment, the next circuit of the third circuit is the first circuit, and the third circuit is the same as the second circuit; or, the next circuit of the third circuit is the second circuit, and the third circuit is the same as the first circuit.

[0161] Optionally, in this embodiment, the control module 640 is further configured to: after alternately controlling the switch module to be in a first switching state during a first duration and in a second switching state during a second duration, control the switch module to be in a fourth switching state during a fourth duration, the fourth duration being T; after controlling the switch module to be in the fourth switching state, control all switches in the switch module to be disconnected to stop heating the battery; in the fourth switching state, a fourth circuit is formed between the power supply module, the switch module, and the energy storage module, and during the fourth duration, the energy storage module discharges to the power supply module through the fourth circuit, the fourth circuit being different from the previous circuit, the previous circuit being a circuit formed by the power supply module, the switch module, and the energy storage module in another switching state where the switch module switches to the fourth switching state.

[0162] Optionally, in the embodiments of this application, the preceding circuit of the fourth circuit is the first circuit, and the fourth circuit is the same as the second circuit; or, the preceding circuit of the fourth circuit is the second circuit, and the fourth circuit is the same as the first circuit.

[0163] Optionally, in this embodiment, the energy storage module includes multiple windings and at least one inductor in a first motor, and the switching module includes a first bridge arm group and a second bridge arm group. Each bridge arm in the first and second bridge arm groups includes an upper bridge arm and a lower bridge arm. The connection points of the upper and lower bridge arms of each bridge arm in the first bridge arm group are connected one-to-one with each of the multiple windings, and the connection points of the upper and lower bridge arms of each bridge arm in the second bridge arm group are connected one-to-one with each of the at least one inductor. Both the first and second bridge arm groups are connected in parallel to the power supply module. The control module 640 is specifically used to: alternately control all lower bridge arms in the first bridge arm group to be turned on, and all lower bridge arms in the first bridge arm group to be turned on. The upper bridge arm is disconnected, all upper bridge arms in the second bridge arm group are turned on, and all lower bridge arms in the second bridge arm group are disconnected; and all upper bridge arms in the first bridge arm group are turned on, all lower bridge arms in the first bridge arm group are disconnected, all lower bridge arms in the second bridge arm group are turned on, and all upper bridge arms in the second bridge arm group are disconnected; wherein, in the first switching state, a first circuit is formed between the power supply module, all lower bridge arms in the first bridge arm group, the plurality of windings, the at least one inductor, and all upper bridge arms in the second bridge arm group; in the second switching state, a second circuit is formed between the power supply module, all upper bridge arms in the first bridge arm group, the plurality of windings, the at least one inductor, and all lower bridge arms in the second bridge arm group.

[0164] Optionally, in this embodiment of the application, the plurality of windings are all the windings in the first motor, the at least one inductor is an external inductor independent of the first motor, and the at least one inductor is connected to the neutral point of the first motor.

[0165] Optionally, in this embodiment of the application, the plurality of windings are all the windings in the first motor, the at least one inductor is all the windings in the second motor, and the neutral point of the first motor is connected to the neutral point of the second motor.

[0166] Optionally, in this embodiment, the first motor is a three-phase motor.

[0167] Optionally, in this embodiment of the application, the first motor is a six-phase motor, the plurality of windings are three windings of the six-phase motor, the at least one inductor is another three windings of the six-phase motor, the spatial phase difference between the three windings is 120°, and the spatial phase difference between the other three windings is 120°.

[0168] Optionally, in this embodiment of the application, the control module 640 is specifically used to: control the switch module to be in the fourth switch state during the fourth duration when it is determined that heating of the battery will stop.

[0169] Optionally, in this embodiment of the application, the control module 640 is further configured to: determine whether to stop heating the battery based on the temperature of the battery.

[0170] Optionally, in this embodiment of the application, the control module 640 is further configured to: determine the first duration and / or the second duration based on the temperature and / or state of charge (SOC) of the battery.

[0171] Optionally, in this embodiment, the power supply module 630 is the battery.

[0172] It should be understood that the heating system 600 can correspond to Figures 4 to 6 For any of the heating systems mentioned above, the specific implementation of heating system 600 can be found in the section on heating systems 600. Figures 4 to 6 The description of the heating system is omitted here for the sake of brevity.

[0173] Figure 27 A schematic block diagram of the control circuit 700 of a power battery heating system according to an embodiment of this application is shown. Figure 27 As shown, the control circuit 700 includes a processor 720. Optionally, the control circuit 700 also includes a memory 710, wherein the memory 710 is used to store instructions, and the processor 720 is used to read the instructions and execute the methods of the various embodiments of the present application based on the instructions.

[0174] Optionally, the processor 720 corresponds to Figure 26 The control module 640 of the heating system 600 shown.

[0175] Optionally, embodiments of this application also provide an electrical device, which includes a battery and a heating system as described above, the heating system being used to heat the battery, and the battery providing power to the electrical device.

[0176] Optionally, the electrical device is a motor vehicle.

[0177] This application also provides a readable storage medium for storing a computer program for performing the methods described in the various embodiments of this application.

[0178] Those skilled in the art will recognize that the units and algorithm steps of the various examples 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 implementation should not be considered beyond the scope of this application.

[0179] 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.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] 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.

[0184] 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 control method for a battery heating system, characterized in that, The heating system includes an energy storage module, a switch module, and a power supply module; The control method includes: The switching module is alternately controlled to be in a first switching state for a first duration and in a second switching state for a second duration, both of which are 2T. In the first switching state, a first circuit is formed between the power supply module, the switching module and the energy storage module. During the first half of the first duration T, the energy storage module discharges to the power supply module through the first circuit, and during the second half of the first duration T, the power supply module charges the energy storage module through the first circuit. In the second switching state, a second circuit is formed between the power supply module, the switching module, and the energy storage module. During the first half of the second duration T, the energy storage module discharges to the power supply module through the second circuit, and during the second half of the second duration T, the power supply module charges the energy storage module through the second circuit. The second circuit is different from the first circuit.

2. The control method according to claim 1, characterized in that, The control method further includes: Before alternately controlling the switch module to be in a first switching state during a first duration and in a second switching state during a second duration, the switch module is controlled to be in a third switching state during a third duration, the third duration being T; In the third switching state, a third circuit is formed between the power supply module, the switching module, and the energy storage module. During the third duration, the power supply module charges the energy storage module through the third circuit. The third circuit is different from the next circuit of the third circuit. The next circuit is the circuit formed by the power supply module, the switching module, and the energy storage module when the switching module switches from the third switching state to another switching state.

3. The control method according to claim 2, characterized in that, The next loop of the third loop is the first loop, and the third loop is the same as the second loop; or, the next loop of the third loop is the second loop, and the third loop is the same as the first loop.

4. The control method according to claim 1, characterized in that, The control method further includes: After alternately controlling the switch module to be in a first switching state during a first duration and in a second switching state during a second duration, the switch module is controlled to be in a fourth switching state during a fourth duration, the fourth duration being T; After controlling the switch module to be in the fourth switch state, control all switches in the switch module to be turned off to stop heating the battery; In the fourth switching state, a fourth circuit is formed between the power supply module, the switching module, and the energy storage module. During the fourth duration, the energy storage module discharges to the power supply module through the fourth circuit. The fourth circuit is different from the previous circuit, which is a circuit formed by the power supply module, the switching module, and the energy storage module in another switching state when the switching module switches to the fourth switching state.

5. The control method according to claim 4, characterized in that, The preceding circuit of the fourth circuit is the first circuit, and the fourth circuit is the same as the second circuit; or, the preceding circuit of the fourth circuit is the second circuit, and the fourth circuit is the same as the first circuit.

6. The control method according to claim 1, characterized in that, The energy storage module includes multiple windings and at least one inductor in the first motor. The switching module includes a first bridge arm group and a second bridge arm group. Each bridge arm in the first bridge arm group and the second bridge arm group includes an upper bridge arm and a lower bridge arm. The connection points of the upper and lower bridge arms of each bridge arm in the first bridge arm group are connected one-to-one with each of the multiple windings. The connection points of the upper and lower bridge arms of each bridge arm in the second bridge arm group are connected one-to-one with each of the at least one inductor. Both the first bridge arm group and the second bridge arm group are connected in parallel to the power supply module. The alternating control of the switching module to be in a first switching state during a first duration and in a second switching state during a second duration includes: Alternately control all lower bridge arms in the first bridge arm group to be on, all upper bridge arms in the first bridge arm group to be off, all upper bridge arms in the second bridge arm group to be on, and all lower bridge arms in the second bridge arm group to be off, and all upper bridge arms in the first bridge arm group to be on, all lower bridge arms in the first bridge arm group to be off, all lower bridge arms in the second bridge arm group to be on, and all upper bridge arms in the second bridge arm group to be off. In the first switching state, a first circuit is formed between the power supply module, all lower bridge arms in the first bridge arm group, the plurality of windings, the at least one inductor, and all upper bridge arms in the second bridge arm group; in the second switching state, a second circuit is formed between the power supply module, all upper bridge arms in the first bridge arm group, the plurality of windings, the at least one inductor, and all lower bridge arms in the second bridge arm group.

7. The control method according to claim 6, characterized in that, The plurality of windings are all the windings in the first motor, and the at least one inductor is an external inductor independent of the first motor, and the at least one inductor is connected to the neutral point of the first motor.

8. The control method according to claim 6, characterized in that, The plurality of windings are all the windings in the first motor, the at least one inductor is all the windings in the second motor, and the neutral point of the first motor is connected to the neutral point of the second motor.

9. The control method according to claim 6, characterized in that, The first motor is a three-phase motor.

10. The control method according to claim 6, characterized in that, The first motor is a six-phase motor, the plurality of windings are three windings of the six-phase motor, the at least one inductor is the other three windings of the six-phase motor, the spatial phase difference of the three windings is 120º, and the spatial phase difference of the other three windings is 120º.

11. The control method according to claim 4, characterized in that, The control of the switching module to be in a fourth switching state during a fourth duration includes: If it is determined that heating of the battery will be stopped, the switch module is controlled to be in the fourth switch state for the fourth duration.

12. The control method according to claim 11, characterized in that, The control method further includes: Based on the temperature of the battery, determine whether to stop heating the battery.

13. The control method according to any one of claims 1 to 12, characterized in that, The control method further includes: The first duration and / or the second duration are determined based on the battery's temperature and / or state of charge (SOC).

14. The control method according to any one of claims 1 to 12, characterized in that, The power supply module is the battery.

15. A heating system for a battery, characterized in that, It includes energy storage modules, switch modules, power supply modules, and control modules; The control module is used for: The switching module is alternately controlled to be in a first switching state for a first duration and in a second switching state for a second duration, both of which are 2T. In the first switching state, a first circuit is formed between the power supply module, the switching module and the energy storage module. During the first half of the first duration T, the energy storage module discharges to the power supply module through the first circuit, and during the second half of the first duration T, the power supply module charges the energy storage module through the first circuit. In the second switching state, a second circuit is formed between the power supply module, the switching module, and the energy storage module. During the first half of the second duration T, the energy storage module discharges to the power supply module through the second circuit, and during the second half of the second duration T, the power supply module charges the energy storage module through the second circuit. The second circuit is different from the first circuit.

16. The heating system according to claim 15, characterized in that, The control module is also used for: Before alternately controlling the switch module to be in a first switching state during a first duration and in a second switching state during a second duration, the switch module is controlled to be in a third switching state during a third duration, the third duration being T; In the third switching state, a third circuit is formed between the power supply module, the switching module, and the energy storage module. During the third duration, the power supply module charges the energy storage module through the third circuit. The third circuit is different from the next circuit of the third circuit. The next circuit is the circuit formed by the power supply module, the switching module, and the energy storage module in another switching state switched from the third switching state.

17. The heating system according to claim 16, characterized in that, The next loop of the third loop is the first loop, and the third loop is the same as the second loop; or, the next loop of the third loop is the second loop, and the third loop is the same as the first loop.

18. The heating system according to claim 15, characterized in that, The control module is also used for: After alternately controlling the switch module to be in a first switching state during a first duration and in a second switching state during a second duration, the switch module is controlled to be in a fourth switching state during a fourth duration, the fourth duration being T; After controlling the switch module to be in the fourth switch state, control all switches in the switch module to be turned off to stop heating the battery; In the fourth switching state, a fourth circuit is formed between the power supply module, the switching module, and the energy storage module. During the fourth duration, the energy storage module discharges to the power supply module through the fourth circuit. The fourth circuit is different from the previous circuit, which is a circuit formed by the power supply module, the switching module, and the energy storage module in another switching state when the switching module switches to the fourth switching state.

19. The heating system according to claim 18, characterized in that, The preceding circuit of the fourth circuit is the first circuit, and the fourth circuit is the same as the second circuit; or, the preceding circuit of the fourth circuit is the second circuit, and the fourth circuit is the same as the first circuit.

20. The heating system according to claim 15, characterized in that, The energy storage module includes multiple windings and at least one inductor in the first motor. The switching module includes a first bridge arm group and a second bridge arm group. Each bridge arm in the first bridge arm group and the second bridge arm group includes an upper bridge arm and a lower bridge arm. The connection points of the upper and lower bridge arms of each bridge arm in the first bridge arm group are connected one-to-one with each of the multiple windings. The connection points of the upper and lower bridge arms of each bridge arm in the second bridge arm group are connected one-to-one with each of the at least one inductor. Both the first bridge arm group and the second bridge arm group are connected in parallel to the power supply module. The control module is specifically used for: Alternately control all lower bridge arms in the first bridge arm group to be on, all upper bridge arms in the first bridge arm group to be off, all upper bridge arms in the second bridge arm group to be on, and all lower bridge arms in the second bridge arm group to be off, and all upper bridge arms in the first bridge arm group to be on, all lower bridge arms in the first bridge arm group to be off, all lower bridge arms in the second bridge arm group to be on, and all upper bridge arms in the second bridge arm group to be off. In the first switching state, a first circuit is formed between the power supply module, all lower bridge arms in the first bridge arm group, the plurality of windings, the at least one inductor, and all upper bridge arms in the second bridge arm group; in the second switching state, a second circuit is formed between the power supply module, all upper bridge arms in the first bridge arm group, the plurality of windings, the at least one inductor, and all lower bridge arms in the second bridge arm group.

21. The heating system according to claim 20, characterized in that, The plurality of windings are all the windings in the first motor, and the at least one inductor is an external inductor independent of the first motor, and the at least one inductor is connected to the neutral point of the first motor.

22. The heating system according to claim 20, characterized in that, The plurality of windings are all the windings in the first motor, the at least one inductor is all the windings in the second motor, and the neutral point of the first motor is connected to the neutral point of the second motor.

23. The heating system according to claim 20, characterized in that, The first motor is a three-phase motor.

24. The heating system according to claim 20, characterized in that, The first motor is a six-phase motor, the plurality of windings are three windings of the six-phase motor, the at least one inductor is the other three windings of the six-phase motor, the spatial phase difference of the three windings is 120º, and the spatial phase difference of the other three windings is 120º.

25. The heating system according to claim 18, characterized in that, The control module is specifically used for: If it is determined that heating of the battery will be stopped, the switch module is controlled to be in the fourth switch state for the fourth duration.

26. The heating system according to claim 25, characterized in that, The control module is also used for: Based on the temperature of the battery, determine whether to stop heating the battery.

27. The heating system according to any one of claims 15 to 26, characterized in that, The control module is also used for: The first duration and / or the second duration are determined based on the battery's temperature and / or state of charge (SOC).

28. The heating system according to any one of claims 15 to 26, characterized in that, The power supply module is the battery.

29. A control circuit for a battery heating system, characterized in that, Includes a processor for performing the control method as described in any one of claims 1 to 14.

30. An electrical device, characterized in that, It includes a battery and a heating system as described in any one of claims 15 to 28, the heating system being used to heat the battery, the battery being used to provide power to the electrical device.

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