CN112133987A - Heating control method and device for power battery - Google Patents
Heating control method and device for power battery Download PDFInfo
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- CN112133987A CN112133987A CN201910555891.XA CN201910555891A CN112133987A CN 112133987 A CN112133987 A CN 112133987A CN 201910555891 A CN201910555891 A CN 201910555891A CN 112133987 A CN112133987 A CN 112133987A
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a heating control method and a heating control device for a power battery, which are applied to a motor controller, wherein the motor controller is connected with the power battery through a direct current bus, and the heating control method for the power battery comprises the following steps: when a heating demand of a power battery is detected, generating a d-axis current instruction and a q-axis current instruction of the permanent magnet synchronous motor, wherein the d-axis current instruction indicates that a current with a periodical positive and negative alternation is generated, and the q-axis current instruction indicates that a current with a value of 0 is generated; and generating alternating current for heating the power battery on the direct current bus side according to the d-axis current command and the q-axis current command. According to the invention, the specific d-axis current instruction and the q-axis current instruction are generated, so that alternating current is generated, the power battery is heated in the power battery, and an external heat source is prevented from being arranged to heat the power battery.
Description
Technical Field
The invention relates to the field of power battery heating, in particular to a heating control method and device for a power battery.
Background
In general, most electrochemical cells, including lead-acid, nickel-cadmium, nickel-hydrogen, lithium ion or lithium polymer cells, have a maximum allowable power output that is temperature dependent and the cell is unable to deliver maximum power in cold climates. In the field of electric automobiles, by considering various factors such as the driving range of the automobile, the weight of the automobile and the like, lithium ion salt batteries are generally adopted as power batteries of the automobile by mainstream electric automobile manufacturers at present; compared with other types of batteries, such as lead-acid batteries, nickel-metal hydride batteries and the like, the new performance of the lithium ion batteries is influenced by the temperature more obviously. At the present stage, under the current situation that the electric automobile power battery technology is not broken through, the heating of the power battery at low temperature is a necessary function of the vehicle, so that the normal work of the vehicle under the low-temperature working condition is ensured.
Conventionally, known methods of heating a vehicle battery are mainly external heat source heating methods, in which heat is applied to a power battery from the outside by incorporating a special electric heating system, such as a heating jacket or a heater, in the power battery to perform a heating function of the power battery. Unfortunately, this approach does not provide satisfactory results because the battery power consumed to generate this additional heat is relatively high compared to a small increase in the internal temperature of the power battery, i.e., the power battery consumes only a portion of the energy used to raise the temperature of the power battery. Therefore, the energy utilization rate of the power battery is low in the process of heating the power battery by using the energy in the power battery. In addition, because all energy of the electric vehicle is derived from a power battery in the electric vehicle during the running process, under the condition that the 'mileage anxiety' problem of the electric vehicle is not completely eliminated, the electric energy consumed by the power battery is increased, the driving mileage of the vehicle is reduced, and the electric vehicle is subject to the following problems.
Disclosure of Invention
The invention provides a heating control method and device for a power battery, which are used for solving the problem of low energy utilization rate in the power battery caused by heating the power battery through an external heat source in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
according to one aspect of the present invention, there is provided a heating control method for a power battery, applied to a motor controller, the motor controller being connected to the power battery through a dc bus, the method including:
when a heating demand of a power battery is detected, generating a d-axis current instruction and a q-axis current instruction of the permanent magnet synchronous motor, wherein the d-axis current instruction indicates that a current with a periodical positive and negative alternation is generated, and the q-axis current instruction indicates that a current with a value of 0 is generated;
and generating alternating current for heating the power battery on the direct current bus side according to the d-axis current command and the q-axis current command.
Optionally, the step of generating a d-axis current command of the permanent magnet synchronous motor includes:
obtaining a d-axis current value according to a preset function and a pre-acquired d-axis current amplitude, wherein the preset function is a periodic function, and the function value of the first half period and the second half period in each period is positive or negative;
and generating a d-axis current command according to the d-axis current value.
Optionally, the preset function is a sine function.
Optionally, the step of obtaining the d-axis current amplitude in advance includes:
acquiring the required heating power of a power battery and the heating power of the power battery;
and according to the required heating power and the heating power, obtaining the d-axis current amplitude by PI (Proportional Integral) control.
Optionally, the step of obtaining the d-axis current amplitude through PI control according to the required heating power and the heating power includes:
subtracting the heating power from the required heating power to obtain a power deviation;
and obtaining the d-axis current amplitude according to the power deviation, a preset proportional coefficient and a preset integral coefficient.
Optionally, after the step of obtaining the d-axis current amplitude through PI control, the heating control method further includes:
limiting the d-axis current amplitude according to a preset safe current range to obtain a limited d-axis current amplitude;
the step of obtaining the d-axis current value according to the preset function and the pre-obtained d-axis current amplitude value comprises the following steps:
and obtaining a d-axis current value according to a preset function and the limited d-axis current amplitude.
Optionally, the step of generating, according to the d-axis current command and the q-axis current command, an alternating current for heating the power battery at the direct current bus side includes:
and according to the d-axis current instruction and the q-axis current instruction, controlling the turn-off and the turn-on of an insulated gate bipolar transistor module in the motor controller, and generating alternating current for heating a power battery at the side of the direct current bus.
According to another aspect of the present invention, there is provided a heating control device for a power battery, applied to a motor controller, the motor controller being connected to the power battery through a dc bus, including:
the generating module is used for generating a d-axis current instruction and a q-axis current instruction of the permanent magnet synchronous motor when the heating requirement of the power battery is detected, wherein the d-axis current instruction indicates that periodic positive and negative alternate current is generated, and the q-axis current instruction indicates that the current with the value of 0 is generated;
and the alternating current heating module is used for generating alternating current for heating the power battery on the direct current bus side according to the d-axis current instruction and the q-axis current instruction.
According to still another aspect of the present invention, there is provided a motor controller including: a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the heating control method of the power cell as described above.
According to yet another aspect of the present invention, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the heating control method of a power cell as described above.
The invention has the beneficial effects that:
according to the technical scheme, when the heating requirement of the power battery is detected, a d-axis current instruction and a q-axis current instruction of the permanent magnet synchronous motor are generated. Because the d-axis current instruction indicates that the periodic positive and negative alternating current is generated, and the q-axis current instruction indicates that the current with the value of 0 is generated, the alternating current can be generated on the direct current bus side of the power battery according to the d-axis current instruction and the q-axis current instruction, so that the power battery is heated by the inside of the power battery, and the power battery is prevented from being heated by an external heat source.
Drawings
Fig. 1 is a schematic diagram illustrating a heating control method for a power battery according to an embodiment of the present invention;
fig. 2 is a schematic control principle diagram of a heating control method for a power battery according to an embodiment of the invention;
fig. 3 shows a heating control device for a power battery according to an embodiment of the present invention.
Description of reference numerals:
31. a generation module; 32. and exchanging the heating module.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1, an embodiment of the present invention provides a method for controlling heating of a power battery, which is applied to a motor controller, where the motor controller is connected to the power battery through a dc bus, and the method for controlling heating of the power battery includes:
s11: when the heating requirement of the power battery is detected, generating a d-axis current instruction and a q-axis current instruction of the permanent magnet synchronous motor, wherein the d-axis current instruction indicates that periodic positive and negative alternate current is generated, and the q-axis current instruction indicates that the current with the value of 0 is generated;
it should be noted that the power battery heating requirement is generated when the power battery needs to be heated, for example, when the temperature of the power battery is lower than a preset temperature threshold, the power battery heating requirement is generated, but not limited thereto. The permanent magnet synchronous motor is connected with the motor controller. And the formula I is a permanent magnet synchronous motor torque calculation formula.
The formula I is as follows:
wherein, TeRepresenting motor output torque, p0Representing the number of pole pairs, ψ of the motorfDenotes the permanent magnet flux linkage idRepresenting d-axis current, i, of the motorqRepresenting the q-axis current, L, of the motordRepresenting d-axis inductance, L, of the machineqRepresenting the q-axis inductance of the motor. According to the formula I, when the q-axis current of the motor is 0, no matter how the d-axis current takes value, the motor outputs the torque TeAll are 0, so that the driving motor can be ensured not to output power in the heating process of the power battery.
S12: an alternating current for heating the power battery is generated on the direct current bus side based on the d-axis current command and the q-axis current command.
It should be noted that the step of generating the alternating current for heating the power battery on the direct current bus side in accordance with the d-axis current command and the q-axis current command includes: and according to the d-axis current instruction and the q-axis current instruction, controlling the on and off of an insulated gate bipolar transistor module in the motor controller, and generating alternating current for heating the power battery at the side of the direct current bus. The motor controller can generate current flowing to the power battery according to the d-axis current instruction and the q-axis current instruction, namely, the power battery is charged. For the power battery, firstly, the current can be output to the motor controller through the direct current bus, and then the current output by the motor controller is received through the direct current bus. The process is similar to continuous cyclic charge and discharge of the power battery, and the power battery repeatedly outputs and receives current, namely alternating current generated by the motor controller. The alternating current is mainly composed of reactive alternating current, and therefore, substantially no direct current component is formed. The alternating current acts on the internal resistance of the power battery to generate heat, and the power battery is heated through the inside of the power battery.
In the embodiment of the invention, when the heating requirement of the power battery is detected, a d-axis current instruction and a q-axis current instruction of the permanent magnet synchronous motor are generated. Because the d-axis current instruction indicates that the periodic positive and negative alternating current is generated, and the q-axis current instruction indicates that the current with the value of 0 is generated, the alternating current can be generated on the direct current bus side of the power battery according to the d-axis current instruction and the q-axis current instruction, so that the power battery is heated by the inside of the power battery, and the power battery is prevented from being heated by an external heat source.
In order to ensure that reactive power current is generated, on the basis of the above embodiment of the present invention, in the embodiment of the present invention, the step of generating the d-axis current command of the permanent magnet synchronous motor includes:
obtaining a d-axis current value according to a preset function and a pre-acquired d-axis current amplitude, wherein the preset function is a periodic function, and the function value of the first half period and the second half period in each period is positive and negative;
a d-axis current command is generated based on the d-axis current value.
It should be noted that the preset function is a sine function, but is not limited thereto. The d-axis current command includes a d-axis current value. Specifically, the preset function is multiplied by the d-axis current amplitude to obtain a d-axis current value. E.g. dcmdAsin ω t; wherein d iscmdRepresenting d-axis current value, a representing d-axis current amplitude, sin ω t representing a sine function, ω representing angular frequency, and t representing time. The d-axis current amplitude may be a fixed value, or may be a variable value, and the larger the d-axis current amplitude is, the larger the ac current amplitude generated on the dc bus side is.
In order to prevent the rotor demagnetization caused by maintaining a fixed value for the d-axis current amplitude, on the basis of the embodiment of the present invention, in the embodiment of the present invention, the step of obtaining the d-axis current amplitude in advance includes:
acquiring the required heating power of a power battery and the heating power of the power battery;
and according to the required heating power and the heating power, obtaining the d-axis current amplitude through PI control.
It should be noted that the step of obtaining the d-axis current amplitude through PI control according to the required heating power and heating power includes:
subtracting the heating power from the required heating power to obtain a power deviation;
and obtaining the d-axis current amplitude according to the power deviation, the preset proportionality coefficient and the preset integral coefficient.
Specifically, the d-axis current amplitude is calculated by a PI control formula. The PI control formula is as follows:
Aint＝KP×△P+KIx × [ Δ ] Pdt; wherein A isintRepresenting d-axis current amplitude, Δ P ═ Pb-Pn, KpIndicating the proportionality coefficient of PI control, KpGreater than 0, for example, 0.5, but not limited thereto, KIIntegral coefficient, K, representing PI controlIAnd > 0, for example, may be 0.8, but is not limited thereto, and t represents time. Pb represents the required heating power of the power battery calculated by the overall vehicle thermal management system, and Pn represents the heating power of the power battery.
Pn can be calculated from the thermal power formula: pn＝Rbatt(C)×|Idc|2Where Pn represents the heating power of the power battery, Rbatt(C) The internal resistance of the power battery is shown, and C shows the temperature of the power battery, wherein the internal resistance of the power battery is related to the temperature, and the internal resistance becomes larger along with the reduction of the temperature. Internal resistance R of power batterybatt(C) Can be calculated by a preset calibrated resistance-temperature curve.
In order to avoid that the d-axis current amplitude is too large to trigger the overcurrent fault of the motor controller, after the step of obtaining the d-axis current amplitude through PI control, the heating control method further comprises the following steps of:
limiting the d-axis current amplitude according to a preset safe current range to obtain a limited d-axis current amplitude;
it should be noted that the preset safe current range is determined according to the current value triggering the overcurrent fault of the motor controller, and the value of the preset safe current range cannot trigger the overcurrent fault of the motor controller. The limiting process is as follows: when the amplitude of the d-axis current is smaller than 0, setting the limited amplitude of the d-axis current to be 0; when the d-axis current amplitude is larger than the maximum value of the preset safe current range, setting the limited d-axis current amplitude as the maximum value of the preset safe current range; when the d-axis current amplitude is smaller than or equal to the maximum value of the preset safe current range and is larger than or equal to 0, setting the limited d-axis current amplitude as the d-axis current amplitude before limitation, namely, not limiting; the minimum value of the preset safe current range is 0.
Correspondingly, the step of obtaining the d-axis current value according to the preset function and the pre-obtained d-axis current amplitude value comprises the following steps:
and obtaining a d-axis current value according to a preset function and the limited d-axis current amplitude.
As shown in fig. 2, a schematic control principle diagram of a heating control method for a power battery according to an embodiment of the present invention is provided; the power battery is connected with the motor controller through a direct current bus, a pre-charging resistor R, a pre-charging capacitor C and a pre-charging switch S2 for controlling the short circuit of the pre-charging resistor R are connected between a positive direct current bus and a negative direct current bus of the power battery, a connecting switch S1 is arranged between the motor controllers of the power battery, the motor controllers can output three-phase alternating current and are respectively connected with the motor through a U-phase connecting point, a V-phase connecting point and a W-phase connecting point.
First, the connection switch S1 is controlled to be closed, the pre-charge switch S2 is opened, the power battery is pre-charged through the pre-charge resistor R and the pre-charge capacitor C, and the pre-charge switch S2 is closed after pre-charging is completed. The generated d-axis current instruction and the q-axis current instruction control the turn-off and the turn-on of an insulated gate bipolar transistor module in the motor controller, so that alternating current with positive and negative alternation is generated on the direct current bus side of the power battery, and the alternating current acts on the internal resistance of the power battery to complete the heating of the interior of the power battery.
As shown in fig. 3, according to another aspect of the present invention, there is provided a heating control device for a power battery, which is applied to a motor controller, the motor controller being connected to the power battery through a dc bus, the heating control device for the power battery comprising:
the generating module 31 is configured to generate a d-axis current instruction and a q-axis current instruction of the permanent magnet synchronous motor when a heating requirement of the power battery is detected, where the d-axis current instruction indicates that a periodic positive-negative alternating current is generated, and the q-axis current instruction indicates that a current with a value of 0 is generated;
and an alternating current heating module 32 for generating alternating current for heating the power battery on the direct current bus side according to the d-axis current command and the q-axis current command.
It should be noted that the generation module 31 includes:
the determining unit is used for obtaining a d-axis current value according to a preset function and a pre-acquired d-axis current amplitude, wherein the preset function is a periodic function, and the function values of the first half period and the second half period in each period are positive and negative;
and the generating unit is used for generating a d-axis current instruction according to the d-axis current value.
Preferably, the predetermined function is a sine function.
This power battery's heating control device still includes:
the acquisition module is used for acquiring the required heating power of the power battery and the heating power of the power battery;
and the PI adjusting module is used for obtaining the d-axis current amplitude through proportional adjustment and integral adjustment PI control according to the required heating power and heating power.
The limiting module is used for limiting the d-axis current amplitude according to a preset safe current range to obtain a limited d-axis current amplitude;
the determining unit is specifically used for obtaining a d-axis current value according to a preset function and the limited d-axis current amplitude;
the PI adjusting module is specifically used for subtracting the heating power from the required heating power to obtain a power deviation; and obtaining the d-axis current amplitude according to the power deviation, the preset proportionality coefficient and the preset integral coefficient.
The ac heating module 32 is specifically configured to control turn-off and turn-on of an insulated gate bipolar transistor module in the motor controller according to the d-axis current instruction and the q-axis current instruction, and generate ac power for heating the power battery on the dc bus side.
In the embodiment of the invention, when the heating requirement of the power battery is detected, a d-axis current instruction and a q-axis current instruction of the permanent magnet synchronous motor are generated. Because the d-axis current instruction indicates that the periodic positive and negative alternating current is generated, and the q-axis current instruction indicates that the current with the value of 0 is generated, the alternating current can be generated on the direct current bus side of the power battery according to the d-axis current instruction and the q-axis current instruction, so that the power battery is heated by the inside of the power battery, and the power battery is prevented from being heated by an external heat source.
According to still another aspect of the present invention, there is provided a motor controller including: the heating control method comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein when the computer program is executed by the processor, the steps of the heating control method of the power battery provided by the embodiments of the invention are realized.
In the embodiment of the invention, when the heating requirement of the power battery is detected, a d-axis current instruction and a q-axis current instruction of the permanent magnet synchronous motor are generated. Because the d-axis current instruction indicates that the periodic positive and negative alternating current is generated, and the q-axis current instruction indicates that the current with the value of 0 is generated, the alternating current can be generated on the direct current bus side of the power battery according to the d-axis current instruction and the q-axis current instruction, so that the power battery is heated by the inside of the power battery, and the power battery is prevented from being heated by an external heat source.
According to another aspect of the present invention, a computer-readable storage medium is provided, wherein a computer program is stored on the computer-readable storage medium, and when being executed by a processor, the computer program implements the steps of the heating control method for the power battery provided by the embodiments of the present invention.
In the embodiment of the invention, when the heating requirement of the power battery is detected, a d-axis current instruction and a q-axis current instruction of the permanent magnet synchronous motor are generated. Because the d-axis current instruction indicates that the periodic positive and negative alternating current is generated, and the q-axis current instruction indicates that the current with the value of 0 is generated, the alternating current can be generated on the direct current bus side of the power battery according to the d-axis current instruction and the q-axis current instruction, so that the power battery is heated by the inside of the power battery, and the power battery is prevented from being heated by an external heat source.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or terminal equipment comprising the element.
Claims (10)
1. A heating control method of a power battery is applied to a motor controller, the motor controller is connected with the power battery through a direct current bus, and the heating control method of the power battery is characterized by comprising the following steps:
when a heating demand of a power battery is detected, generating a d-axis current instruction and a q-axis current instruction of the permanent magnet synchronous motor, wherein the d-axis current instruction indicates that a current with a periodical positive and negative alternation is generated, and the q-axis current instruction indicates that a current with a value of 0 is generated;
and generating alternating current for heating the power battery on the direct current bus side according to the d-axis current command and the q-axis current command.
2. The method for controlling heating of a power battery according to claim 1, wherein the step of generating a d-axis current command for a permanent magnet synchronous motor comprises:
obtaining a d-axis current value according to a preset function and a pre-acquired d-axis current amplitude, wherein the preset function is a periodic function, and the function value of the first half period and the second half period in each period is positive or negative;
and generating a d-axis current command according to the d-axis current value.
3. The method for controlling heating of a power battery according to claim 2, wherein the preset function is a sinusoidal function.
4. The heating control method of the power battery according to claim 2, wherein the step of obtaining the d-axis current amplitude in advance comprises:
acquiring the required heating power of a power battery and the heating power of the power battery;
and according to the required heating power and the heating power, obtaining the d-axis current amplitude through proportional adjustment and integral adjustment PI control.
5. The heating control method of the power battery according to claim 4, wherein the step of obtaining the d-axis current amplitude through proportional regulation and integral regulation PI control according to the required heating power and the heating power comprises:
subtracting the heating power from the required heating power to obtain a power deviation;
and obtaining the d-axis current amplitude according to the power deviation, a preset proportional coefficient and a preset integral coefficient.
6. The heating control method of the power battery according to claim 4, wherein after the step of obtaining the d-axis current amplitude through proportional regulation and integral regulation PI control, the heating control method further comprises:
limiting the d-axis current amplitude according to a preset safe current range to obtain a limited d-axis current amplitude;
the step of obtaining the d-axis current value according to the preset function and the pre-obtained d-axis current amplitude value comprises the following steps:
and obtaining a d-axis current value according to a preset function and the limited d-axis current amplitude.
7. The method for controlling heating of a power battery according to claim 1, wherein the step of generating an alternating current for heating the power battery on the direct current bus side in accordance with the d-axis current command and the q-axis current command includes:
and according to the d-axis current instruction and the q-axis current instruction, controlling the turn-off and the turn-on of an insulated gate bipolar transistor module in the motor controller, and generating alternating current for heating a power battery at the side of the direct current bus.
8. The utility model provides a power battery's heating control device, is applied to machine controller, machine controller passes through the direct current generating line and links to each other with power battery, its characterized in that includes:
the generating module is used for generating a d-axis current instruction and a q-axis current instruction of the permanent magnet synchronous motor when the heating requirement of the power battery is detected, wherein the d-axis current instruction indicates that periodic positive and negative alternate current is generated, and the q-axis current instruction indicates that the current with the value of 0 is generated;
and the alternating current heating module is used for generating alternating current for heating the power battery on the direct current bus side according to the d-axis current instruction and the q-axis current instruction.
9. A motor controller, comprising: memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the heating control method of a power cell according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that a computer program is stored thereon, which, when being executed by a processor, carries out the steps of the heating control method of a power cell according to any one of claims 1 to 7.
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