CN114290961A - Heating control method and system for power battery of motor and electric vehicle - Google Patents

Heating control method and system for power battery of motor and electric vehicle Download PDF

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CN114290961A
CN114290961A CN202111636948.2A CN202111636948A CN114290961A CN 114290961 A CN114290961 A CN 114290961A CN 202111636948 A CN202111636948 A CN 202111636948A CN 114290961 A CN114290961 A CN 114290961A
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王海鑫
丰树帅
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Leadrive Technology Shanghai Co Ltd
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    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

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Abstract

The invention provides a heating control method and a heating control system for a power battery of a motor and an electric vehicle, wherein injected high-frequency current only has d-axis current, no high-frequency moment is generated, and mechanical noise generated by the high-frequency moment is avoided; a small voltage which is not 0 is input into the q axis, so that a small moment can be generated, the gear can lean against one side, and the noise problem caused by characteristic frequency secondary resonance due to gear backlash tooth beating of the finished vehicle when the moment passes through 0 point is avoided; by inputting square wave voltage with constant amplitude to the d axis, the current ripple at the direct current side is small, and the influence of capacitance is small, so that the current at the direct current side is approximately equal to the battery current, and the output capacity of the current is enhanced; the frequency of the high-frequency voltage is also adjusted in real time.

Description

Heating control method and system for power battery of motor and electric vehicle
Technical Field
The invention relates to the technical field of electric vehicles, in particular to a heating control method and system for a power battery of a motor and an electric vehicle.
Background
In recent years, with the rapid development of electric vehicles, the related technologies have been rapidly developed, and electric vehicle products have been accepted by the masses and have entered into thousands of households, and especially in large and medium-sized cities, electric vehicles have become a bright landscape in cities. Although the electric automobile technology has achieved the leapfrog development, some technologies have not been broken through, and among them, the high-power discharge of the power battery under the low-temperature condition is one of them. Most electrochemical cells, such as: the maximum allowable output power of lead-acid batteries, nickel-cadmium batteries, nickel-hydrogen batteries, lithium ion batteries and the like is related to the temperature, and the batteries cannot output the maximum power under the low-temperature condition.
In the field of electric automobiles, lithium ion batteries are the absolute mainstream of vehicle power batteries, but compared with other types of batteries, such as lead-acid batteries, nickel-cadmium batteries and the like, the degree of influence of temperature on the performance of the lithium ion batteries is more obvious, high-power output cannot be performed in a low-temperature state, and before the battery technology is broken through, the characteristic of the lithium ion power batteries is faced by all electric automobile manufacturers.
At present, regarding the problem of low-temperature performance degradation of the power battery, an external heating method is generally adopted, and a special electric heating system, such as an electric heater or a liquid heater, is added into the power battery to heat the power battery, so as to increase the temperature of the power battery from the outside to meet the performance requirement.
Disclosure of Invention
In order to overcome the technical defects, the invention aims to provide a heating control method and a heating control system for a power battery, which utilize a motor and a controller of an electric vehicle to rapidly charge and discharge the battery and utilize a resistor to heat the battery from the inside, and the electric vehicle.
The invention discloses a heating control method for a power battery of a motor, which comprises the following steps: inputting constant voltage V to q-axis of motorq，Vq＝Rs*IqWherein R issIs a resistance, IqIs the q axisCurrent flow; and IqThe first torque is smaller than a first preset torque threshold value, so that the motor generates a first torque; inputting periodic high-frequency voltage V with constant amplitude to d-axis of motordhBy generating an electric current I in the motordTo generate a high-frequency current I on a DC bus of an inverterdcBy said high-frequency current IdcHeating the power battery; the high frequency voltage VdhIs a square wave voltage.
Preferably, the high-frequency voltage VdhIs constant in amplitude of
Figure BDA0003442322280000021
Wherein, UdhIs the voltage of the power battery.
Preferably, the periodic high-frequency voltage V with constant amplitude is input to the d-axis of the motordhBy generating an electric current I in the motordTo generate a high-frequency current I on a DC bus of an inverterdcBy said high-frequency current IdcHeating the power cell further comprises: setting a d-axis current target value Id-rms(ii) a Real-time acquisition of d-axis current feedback value I of motord-fbkThe d-axis current target value Id-rmsAnd the d-axis current feedback value Id-fbkDifferencing to obtain the adjusted value Δ Id(ii) a Adjusting the adjustment value Δ IdThe input regulator performs closed-loop regulation to output high-frequency voltage VdhAccording to the frequency value, the input high-frequency voltage V is adjusted in real timedh。
Preferably, the d-axis current feedback value I of the motor is acquired in real timed-fbkAnd then also comprises: according to the formula
Figure BDA0003442322280000022
Calculating the d-axis current feedback value Id-fbkEffective value of (I)d-effThe d-axis current target value Id-rmsAnd said effective value Id-effDifferencing to obtain the adjusted value Δ Id。
Preferably, the adjustment value Δ I is setdThe input regulator performs closed-loop regulation to output high-frequency voltage VdhAccording to the frequency value, the input high-frequency voltage V is adjusted in real timedhFurther comprising: when the regulating value Δ IdLess than a predetermined limit value IsWhen so, the closed-loop regulation is stopped.
Preferably, the motor comprises a permanent magnet synchronous motor, an alternating current asynchronous motor, a direct current brushless motor and an excitation motor.
The invention also discloses a heating control system for the power battery of the motor, wherein the motor is connected with the power battery through the inverter; inputting a constant voltage V to a q-axis of the motorq，Vq＝Rs*IqWherein R issIs a resistance, IqIs the q-axis current; and IqThe first torque is smaller than a first preset torque threshold value, so that the motor generates a first torque; inputting periodic high-frequency voltage V with constant amplitude to d-axis of motordhBy generating an electric current I in the motordTo generate a high-frequency current I on a DC bus of an inverterdcBy said high-frequency current IdcHeating the power battery; the high frequency voltage VdhIs a square wave voltage with an amplitude of
Figure BDA0003442322280000031
Wherein, UdhIs the voltage of the power battery; setting a d-axis current target value Id-rms(ii) a Real-time acquisition of d-axis current feedback value I of motord-fbkAnd through the d-axis current feedback value Id-fbkCalculating to obtain an effective value Id-effThe d-axis current target value Id-rmsAnd said effective value Id-effDifferencing to obtain the adjusted value Δ Id(ii) a Adjusting the adjustment value Δ IdThe input regulator performs closed-loop regulation to output high-frequency voltage VdhAccording to the frequency value, the input high-frequency voltage V is adjusted in real timedh。
The invention also discloses an electric vehicle which comprises a motor, an inverter and a power battery, wherein the motor passes through the inverterIs connected with the power battery; inputting a constant voltage V to a q-axis of the motorq，Vq＝Rs*IqWherein R issIs a resistance, IqIs the q-axis current; and IqThe first torque is smaller than a first preset torque threshold value, so that the motor generates a first torque; inputting periodic high-frequency voltage V with constant amplitude to d-axis of motordhBy generating an electric current I in the motordTo generate a high-frequency current I on a DC bus of an inverterdcBy said high-frequency current IdcHeating the power battery; the high frequency voltage VdhIs a square wave voltage with an amplitude of
Figure BDA0003442322280000032
Wherein, UdhIs the voltage of the power battery; setting a d-axis current target value Id-rms(ii) a Real-time acquisition of d-axis current feedback value I of motord-fbkAnd through the d-axis current feedback value Id-fbkCalculating to obtain an effective value Id-effThe d-axis current target value Id-rmsAnd said effective value Id-effDifferencing to obtain the adjusted value Δ Id(ii) a Adjusting the adjustment value Δ IdThe input regulator performs closed-loop regulation to output high-frequency voltage VdhAccording to the frequency value, the input high-frequency voltage V is adjusted in real timedh。
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
1. the injected high-frequency current only has d-axis current, no high-frequency moment is generated, and mechanical noise generated by the high-frequency moment is avoided;
2. a small voltage which is not 0 is input into the q axis, so that a small moment can be generated, the gear can lean against one side, and the noise problem caused by characteristic frequency secondary resonance due to gear backlash tooth beating of the finished vehicle when the moment passes through 0 point is avoided;
3. by inputting the square wave voltage with constant amplitude to the d axis, the current ripple at the direct current side is small, and the influence of the capacitor is small, so that the current at the direct current side is approximately equal to the battery current, and the output capacity of the current is enhanced.
Drawings
Fig. 1 is a control flow diagram of a heating control method for a power battery of a motor provided by the invention;
FIG. 2 is a voltage diagram of one embodiment of a square wave voltage provided by the present invention;
FIG. 3 is a diagram illustrating the variation of the current of the battery after square wave voltage is applied in the heating control method for the power battery of the motor according to the present invention;
fig. 4 is a current change diagram of a d-axis current after a square wave voltage is adopted in the heating control method for the power battery of the motor provided by the invention;
FIG. 5 is a schematic flow chart of real-time feedback adjustment of the frequency of square wave voltage according to the present invention;
fig. 6 is a schematic structural diagram of a heating control system of a power battery for an electric machine provided by the invention, wherein Idc is a bus current and Ibat is a battery current.
Detailed Description
The advantages of the invention are further illustrated in the following description of specific embodiments in conjunction with the accompanying drawings.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in themselves. Thus, "module" and "component" may be used in a mixture.
Electric automobile includes motor controller, vehicle control unit, battery management system and the driving motor who is connected with motor controller respectively usually, and wherein, vehicle control unit mainly is responsible for the overall management of power battery self-heating control, contains: the method comprises the steps that a heating power instruction is sent according to the state of a power battery and the state of a vehicle, a motor controller receives the heating power instruction sent by a vehicle controller, the state of the power battery fed back by a battery management system and the state of a driving motor, and an Insulated Gate Bipolar Transistor (IGBT) module in the motor controller is controlled. The motor controller comprises two main hardware, namely a control board and a drive board, the control board is used for realizing a motor control algorithm, the drive board is used for responding to a control signal sent by the execution control board and driving the IGBT module to work so that the drive motor outputs a driving force, and therefore alternating current is generated at a high-voltage bus end of a power battery connected with the motor controller, and self-heating of the power battery is realized through the alternating current.
The invention discloses a heating control method for a power battery of a motor, which comprises the steps of firstly injecting a constant non-zero voltage into a q axis of a permanent magnet synchronous motor, then injecting a constant high-frequency square wave voltage into a d axis of the permanent magnet synchronous motor, controlling a motor controller to generate alternating current at a high-voltage bus end connected with the power battery by utilizing Space Vector Pulse Width Modulation (SVPWM), and heating the power battery by utilizing the heat generated by the internal resistance of the power battery through repeatedly enabling the power battery to be in a charging-discharging circulation state according to the rotor magnetic field orientation vector control principle of the permanent magnet synchronous motor.
Specifically, referring to fig. 1 and 6, a constant voltage V is input to the q-axis of the motorq，Vq＝Rs*IqWherein R issIs a resistance, IqIs the q-axis current. I isqAnd the first torque is smaller than a first preset torque threshold value, so that the motor generates a first torque. By injecting a constant non-zero voltage, a smaller torque is generated, the torque can enable the gear to lean against one side, and the noise problem caused by characteristic frequency sub-resonance of the whole vehicle due to gear backlash gear beating when the torque passes through 0 point is avoided. The first preset current threshold and the first preset torque threshold are used for generating small force by the teethThe threshold value of the moment is not limited to a specific value as long as the gear can be moved to one side without slipping back and forth to cause resonance noise.
Then, a periodic high-frequency voltage V with a constant amplitude is input to the d-axis of the motordhBy generating an electric current I in the motordTo generate a high-frequency current I on a DC bus of an inverterdcBy means of a high-frequency current IdcAnd heating the power battery. The periodic high-frequency voltage of the invention adopts square wave voltage, refer to fig. 2-4, fig. 2 is a voltage schematic diagram of an implementation situation of the square wave voltage, fig. 3 is a current variation diagram of the battery after adopting the square wave voltage, fig. 4 is a current variation diagram of d-axis current after adopting the square wave voltage, and as can be seen from the diagrams, the square wave voltage can ensure that the current ripple at the direct current side is small and is slightly influenced by the capacitor, so that the current at the direct current side is approximately equal to the battery current, and the output capacity of the current is enhanced.
It should be noted that the above processes are not in strict sequence, and if the above sequence is adopted, better effects can be usually achieved, but the achievement effect of the present invention is not limited to the sequence of the above steps.
In the present invention, the d-axis refers to the direct axis of the permanent magnet synchronous motor, and the q-axis refers to the quadrature axis of the permanent magnet synchronous motor.
Further, a high frequency voltage VdhIs constant in amplitude of
Figure BDA0003442322280000061
Wherein, UdhIs the voltage of the power battery.
Further, feedback regulation is performed on the d-axis current during the process of heating the power battery, and with reference to fig. 5, specifically:
firstly, a d-axis current target value I is setd-rms；
Then, a d-axis current feedback value I of the motor is acquired in real time in the process of heating the power batteryd-fbkD-axis current target value Id-rmsAnd d-axis current feedback value Id-fbkDifferencing to obtain the adjusted value Δ Id；
Will adjust the value Δ IdInput deviceThe PI regulator performs closed-loop regulation, and regulates the output high-frequency voltage V through an internal algorithmdhAccording to the frequency value, the input high-frequency voltage V is adjusted in real timedh。
The voltage is periodic square wave voltage, so the collected d-axis current feedback value Id-fbkUsually, the comparison with the target value cannot be made directly as a feedback value, but rather an effective value thereof needs to be calculated, which is understood to be an average value per unit time. Specifically, it can be based on formula
Figure BDA0003442322280000062
Calculating d-axis current feedback value Id-fbkEffective value of (I)d-effThen, the d-axis current target value I is calculatedd-rmsAnd a significant value Id-effDifferencing to obtain the adjusted value Δ Id。
Preferably, a predetermined limit value I is setsWhen adjusting the value Δ IdLess than a predetermined limit value IsTime, d-axis current feedback value Id-fbkAnd d-axis current target value Id-rmsThe difference is within the normal range and no further adjustment is required, and closed-loop adjustment is stopped.
Another preference is given to the d-axis current feedback value Id-fbkAnd d-axis current target value Id-rmsCannot be completely equal, and a difference not equal to 0 must exist between them, so the preset limit I may not be setsThrough d-axis current feedback value Id-fbkAnd d-axis current target value Id-rmsThe difference between them, the square wave voltage is adjusted without limit.
The motor of the invention comprises a permanent magnet synchronous motor, an alternating current asynchronous motor, a direct current brushless motor and an excitation motor.
The invention also discloses a heating control system for the power battery of the motor, wherein the motor is connected with the power battery through the inverter; inputting constant voltage V to q-axis of motorq，Vq＝Rs*IqWherein R issIs a resistance, IqIs the q-axis current; and IqLess than a first preset current threshold so that the motor generates a first torqueThe first torque is less than a first predetermined torque threshold. The generated smaller moment can enable the gear to lean against one side, and the noise problem caused by characteristic frequency sub-resonance due to gear backlash gear beating of the finished vehicle when the moment passes through 0 point is avoided.
Inputting periodic high-frequency voltage V with constant amplitude to d-axis of motordhBy generating an electric current I in the motordTo generate a high-frequency current I on a DC bus of an inverterdcBy means of a high-frequency current IdcHeating the power battery; high frequency voltage VdhIs a square wave voltage with an amplitude of
Figure BDA0003442322280000071
Wherein, UdhIs the voltage of the power cell; setting a d-axis current target value Id-rms. The current ripple at the direct current side can be small by injecting square wave voltage, and the influence of capacitance is small, so that the current at the direct current side is approximately equal to the battery current, and the output capacity of the current is enhanced.
Real-time acquisition of d-axis current feedback value I of motord-fbkAnd through d-axis current feedback value Id-fbkCalculating to obtain an effective value Id-effD-axis current target value Id-rmsAnd a significant value Id-effDifferencing to obtain the adjusted value Δ Id(ii) a Will adjust the value Δ IdThe input regulator performs closed-loop regulation to output high-frequency voltage VdhAccording to the frequency value, the input high-frequency voltage V is adjusted in real timedhTo adjust the frequency of the high frequency voltage in real time.
The invention also discloses an electric vehicle which comprises a motor, an inverter and a power battery, wherein the motor is connected with the power battery through the inverter.
Inputting constant voltage V to q-axis of motorq，Vq＝Rs*IqWherein R issIs a resistance, IqIs the q-axis current; and IqAnd the first torque is smaller than a first preset torque threshold value, so that the motor generates a first torque. The generated smaller moment can enable the gear to lean against one side, and the phenomenon that the moment is too large due to generation of the moment is avoidedAnd 0 point, the noise generated by characteristic frequency sub-resonance of the whole vehicle due to gear backlash and gear beating.
Inputting periodic high-frequency voltage V with constant amplitude to d-axis of motordhBy generating an electric current I in the motordTo generate a high-frequency current I on a DC bus of an inverterdcBy means of a high-frequency current IdcHeating the power battery; high frequency voltage VdhIs a square wave voltage with an amplitude of
Figure BDA0003442322280000072
Wherein, UdhIs the voltage of the power cell; setting a d-axis current target value Id-rms. The current ripple at the direct current side can be small by injecting square wave voltage, and the influence of capacitance is small, so that the current at the direct current side is approximately equal to the battery current, and the output capacity of the current is enhanced.
Real-time acquisition of d-axis current feedback value I of motord-fbkAnd through d-axis current feedback value Id-fbkCalculating to obtain an effective value Id-effD-axis current target value Id-rmsAnd a significant value Id-effDifferencing to obtain the adjusted value Δ Id(ii) a Will adjust the value Δ IdThe input regulator performs closed-loop regulation to output high-frequency voltage VdhAccording to the frequency value, the input high-frequency voltage V is adjusted in real timedhTo adjust the frequency of the high frequency voltage in real time.
It should be noted that the embodiments of the present invention have been described in terms of preferred embodiments, and not by way of limitation, and that those skilled in the art can make modifications and variations of the embodiments described above without departing from the spirit of the invention.

Claims (8)

1. A heating control method for a power battery of a motor is characterized by comprising the following steps:
q-axis input to an electric machineConstant voltage Vq，Vq＝Rs*IqWherein R issIs a resistance, IqIs the q-axis current; and IqThe first torque is smaller than a first preset torque threshold value, so that the motor generates a first torque;
inputting periodic high-frequency voltage V with constant amplitude to d-axis of motordhBy generating an electric current I in the motordTo generate a high-frequency current I on a DC bus of an inverterdcBy said high-frequency current IdcHeating the power battery;
the high frequency voltage VdhIs a square wave voltage.
2. The heating control method according to claim 1, wherein the high-frequency voltage VdhIs constant in amplitude of
Figure FDA0003442322270000011
Wherein, UdhIs the voltage of the power battery.
3. The heating control method according to claim 1, wherein the periodic high-frequency voltage V of constant amplitude is input to a d-axis of the motordhBy generating an electric current I in the motordTo generate a high-frequency current I on a DC bus of an inverterdcBy said high-frequency current IdcHeating the power cell further comprises:
setting a d-axis current target value Id-rms；
Real-time acquisition of d-axis current feedback value I of motord-fbkThe d-axis current target value Id-rmsAnd the d-axis current feedback value Id-fbkDifferencing to obtain the adjusted value Δ Id；
Adjusting the adjustment value Δ IdThe input regulator performs closed-loop regulation to output high-frequency voltage VdhAccording to the frequency value, the input high-frequency voltage V is adjusted in real timedh。
4. The heating control method according to claim 3, wherein the real-time acquisition of the d-axis current feedback value I of the motord-fbkAnd then also comprises:
according to the formula
Figure FDA0003442322270000012
Calculating the d-axis current feedback value Id-fbkEffective value of (I)d-effThe d-axis current target value Id-rmsAnd said effective value Id-effDifferencing to obtain the adjusted value Δ Id。
5. The heating control method according to claim 3, characterized in that the adjustment value Δ I is adjusteddThe input regulator performs closed-loop regulation to output high-frequency voltage VdhAccording to the frequency value, the input high-frequency voltage V is adjusted in real timedhFurther comprising:
when the regulating value Δ IdLess than a predetermined limit value IsWhen so, the closed-loop regulation is stopped.
6. The heating control method according to claim 1, wherein the motor includes a permanent magnet synchronous motor, an alternating current asynchronous motor, a direct current brushless motor, and an excitation motor.
7. A heating control system for a power battery of a motor is characterized in that the motor is connected with the power battery through an inverter;
inputting a constant voltage V to a q-axis of the motorq，Vq＝Rs*IqWherein R issIs a resistance, IqIs the q-axis current; and IqThe first torque is smaller than a first preset torque threshold value, so that the motor generates a first torque;
inputting periodic high-frequency voltage V with constant amplitude to d-axis of motordhBy generating an electric current I in the motordTo generate a high-frequency current I on a DC bus of an inverterdcBy said high-frequency current IdcHeating the power battery;
the high frequency voltage VdhIs a square wave voltage with an amplitude of
Figure FDA0003442322270000021
Wherein, UdhIs the voltage of the power battery;
setting a d-axis current target value Id-rms(ii) a Real-time acquisition of d-axis current feedback value I of motord-fbkAnd through the d-axis current feedback value Id-fbkCalculating to obtain an effective value Id-effThe d-axis current target value Id-rmsAnd said effective value Id-effDifferencing to obtain the adjusted value Δ Id(ii) a Adjusting the adjustment value Δ IdThe input regulator performs closed-loop regulation to output high-frequency voltage VdhAccording to the frequency value, the input high-frequency voltage V is adjusted in real timedh。
8. An electric vehicle is characterized by comprising a motor, an inverter and a power battery, wherein the motor is connected with the power battery through the inverter;
inputting a constant voltage V to a q-axis of the motorq，Vq＝Rs*IqWherein R issIs a resistance, IqIs the q-axis current; and IqThe first torque is smaller than a first preset torque threshold value, so that the motor generates a first torque;
inputting periodic high-frequency voltage V with constant amplitude to d-axis of motordhBy generating an electric current I in the motordTo generate a high-frequency current I on a DC bus of an inverterdcBy said high-frequency current IdcHeating the power battery;
the high frequency voltage VdhIs a square wave voltage with an amplitude of
Figure FDA0003442322270000031
Wherein, UdhIs the voltage of the power battery;
setting a d-axis current target value Id-rms(ii) a Real-time acquisition of d-axis current feedback value I of motord-fbkAnd through the d-axis current feedback value Id-fbkCalculating to obtain an effective value Id-effThe d-axis current target value Id-rmsAnd said effective value Id-effDifferencing to obtain the adjusted value Δ Id(ii) a Adjusting the adjustment value Δ IdThe input regulator performs closed-loop regulation to output high-frequency voltage VdhAccording to the frequency value, the input high-frequency voltage V is adjusted in real timedh。
CN202111636948.2A 2021-12-29 2021-12-29 Heating control method and system for power battery of motor and electric vehicle Pending CN114290961A (en)

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Publication number Priority date Publication date Assignee Title
CN116722780A (en) * 2023-06-07 2023-09-08 江苏威进智控科技有限公司 Active heating method of power battery based on motor current and PWM configuration
CN116722780B (en) * 2023-06-07 2024-02-13 江苏威进智控科技有限公司 Active heating method of power battery based on motor current and PWM configuration

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