CN113972707A - Vehicle, energy conversion device, and control method therefor - Google Patents

Vehicle, energy conversion device, and control method therefor Download PDF

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Publication number
CN113972707A
CN113972707A CN202010717036.7A CN202010717036A CN113972707A CN 113972707 A CN113972707 A CN 113972707A CN 202010717036 A CN202010717036 A CN 202010717036A CN 113972707 A CN113972707 A CN 113972707A
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CN
China
Prior art keywords
battery
charging
current
bridge arm
discharging frequency
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Pending
Application number
CN202010717036.7A
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Chinese (zh)
Inventor
凌和平
潘华
谢飞跃
谢朝
王刚
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BYD Co Ltd
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BYD Co Ltd
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Publication date
Application filed by BYD Co Ltd filed Critical BYD Co Ltd
Priority to CN202010717036.7A priority Critical patent/CN113972707A/en
Publication of CN113972707A publication Critical patent/CN113972707A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The technical scheme of the application provides a vehicle, an energy conversion device and a control method thereof, wherein the energy conversion device comprises a bridge arm converter, a motor winding and an energy storage element, the motor winding, the energy storage element and a battery are connected to form a battery heating circuit, and the control method comprises the following steps: when a battery heating instruction is obtained, controlling the bridge arm converter at an initial charging and discharging frequency to charge and discharge the battery and the energy storage element so as to self-heat the battery; in the battery heating process, battery parameters are obtained, the charging and discharging frequency of the battery heating circuit is adjusted according to the battery parameters, and the bridge arm converter is controlled to adjust the current flowing through the battery heating circuit according to the charging and discharging frequency so as to adjust the heating power of the battery. According to the bridge arm converter, the bridge arm converter is adjusted according to the change of the battery parameters, the charging and discharging frequency of the battery is adjusted, the heating power of the battery is controlled, and the problems of low heating efficiency and high noise of the battery in the heating process of the battery are solved.

Description

Vehicle, energy conversion device, and control method therefor
Technical Field
The present application relates to the field of vehicle technologies, and in particular, to a vehicle, an energy conversion apparatus, and a control method thereof.
Background
With the wide use of new energy, batteries can be used as a power source in various fields. The battery may be used as a power source in different environments, and the performance of the battery may be affected. For example, the performance of the battery in a low-temperature environment is greatly reduced from that at normal temperature. For example, the discharge capacity of the battery at the zero point temperature may decrease as the temperature decreases. At-30 ℃, the discharge capacity of the battery was substantially 0, resulting in the battery being unusable. In order to enable the battery to be used in a low-temperature environment, it is necessary to preheat the battery before using the battery.
As shown in fig. 1, the prior art includes a bridge arm inverter 101, a motor 102, and a battery 103, when the battery 103 is in a discharging process, a transistor VT1 and a transistor VT6 in the bridge arm inverter 101 are triggered to be simultaneously turned on, a current flows out from a positive electrode of the battery 103, returns to a negative electrode of the battery 103 through a transistor VT1, a transistor VT6, and two stator inductors of the motor 102, the current rises, and energy is stored in the two stator inductors; when the battery 103 is in a charging process, as shown in fig. 2, the transistor VT1 and the transistor VT6 are simultaneously turned off, the current returns to the battery 102 from the two stator inductances of the motor 102 and the bridge arm inverter 101 through the two bleeder diodes VD4 and VD3, and the current drops. The two processes are repeated, the battery is in a rapid charging and discharging alternating state, and due to the existence of the internal resistance of the battery, a large amount of heat is generated inside the battery, and the temperature is rapidly increased. However, the prior art has the following problems: in the process of heating the battery, because the charging and discharging frequency of the battery is fixed, along with the increase of the battery heating time and the change of the external environment, the ideal battery heating current cannot be output under the original battery charging and discharging frequency, so that the heating efficiency of the battery is influenced, and meanwhile, the noise generated by the motor is also very large, thereby seriously influencing the driving feeling of a driver.
Disclosure of Invention
The present application is directed to a vehicle, an energy conversion apparatus, and a control method thereof, which can adjust a heating efficiency of a battery by adjusting a bridge arm converter according to a battery parameter, thereby avoiding problems of low heating efficiency and high noise of the battery during a battery heating process.
The present application is achieved in that a first aspect of the present application provides a control method of an energy conversion apparatus including:
the bridge arm converter, the motor winding and the energy storage element are connected with a battery to form a battery heating circuit;
the control method comprises the following steps:
when a battery heating instruction is obtained, controlling the bridge arm converter at an initial charging and discharging frequency to charge and discharge the battery and the energy storage element so as to self-heat the battery;
in the battery heating process, the battery parameters are obtained, the charging and discharging frequency of the battery heating circuit is adjusted according to the battery parameters, and the bridge arm converter is controlled to adjust the current flowing through the battery heating circuit according to the charging and discharging frequency so as to adjust the heating power of the battery.
A second aspect of the present application provides an energy conversion apparatus comprising:
the bridge arm converter, the motor winding and the energy storage element are connected with a battery to form a battery heating circuit;
the energy conversion device further comprises a control module configured to:
when a battery heating instruction is obtained, controlling the bridge arm converter at an initial charging and discharging frequency to charge and discharge the battery and the energy storage element so as to self-heat the battery;
in the battery heating process, the battery parameters are obtained, the charging and discharging frequency of the battery heating circuit is adjusted according to the battery parameters, and the bridge arm converter is controlled to adjust the current flowing through the battery heating circuit according to the charging and discharging frequency so as to adjust the heating power of the battery.
A third aspect of the present application provides a vehicle including the energy conversion apparatus of the second aspect.
The technical scheme of the application provides a vehicle, an energy conversion device and a control method thereof, wherein the energy conversion device comprises a bridge arm converter, a motor winding and an energy storage element, the motor winding, the energy storage element and a battery are connected to form a battery heating circuit, and the control method comprises the following steps: when a battery heating instruction is obtained, controlling the bridge arm converter at an initial charging and discharging frequency to charge and discharge the battery and the energy storage element so as to self-heat the battery; in the battery heating process, battery parameters are obtained, the charging and discharging frequency of the battery heating circuit is adjusted according to the battery parameters, and the bridge arm converter is controlled to adjust the current flowing through the battery heating circuit according to the charging and discharging frequency so as to adjust the heating power of the battery. According to the bridge arm converter, the bridge arm converter is adjusted according to the change of the battery parameters, the charging and discharging frequency of the battery is adjusted, the heating power of the battery is controlled, and the problems of low heating efficiency and high noise of the battery in the heating process of the battery are solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a current flow diagram of a motor control circuit provided by the prior art;
FIG. 2 is another current flow diagram of a motor control circuit provided by the prior art;
fig. 3 is a circuit diagram of an energy conversion device according to an embodiment of the present application;
fig. 4 is another circuit diagram of an energy conversion device according to an embodiment of the present application;
fig. 5 is another circuit diagram of an energy conversion device according to an embodiment of the present application;
fig. 6 is a flowchart of a control method of an energy conversion apparatus according to an embodiment of the present disclosure;
fig. 7 is a flowchart illustrating a step S10 of a control method of an energy conversion apparatus according to an embodiment of the present application;
fig. 8 is a flowchart illustrating a step S20 of a control method of an energy conversion apparatus according to an embodiment of the present application;
fig. 9 is a current flow diagram of an energy conversion device according to an embodiment of the present application;
fig. 10 is another current flow diagram of an energy conversion device provided in an embodiment of the present application;
fig. 11 is another current flow diagram of an energy conversion device according to an embodiment of the present application;
fig. 12 is another current flow diagram of an energy conversion device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In order to explain the technical means of the present application, the following description will be given by way of specific examples.
An embodiment of the present application provides an energy conversion device, and the energy conversion device includes:
the bridge arm converter, the motor winding and the energy storage element are connected with the battery to form a battery heating circuit.
As a first embodiment of the connection relationship among the bridge arm inverter, the motor winding, and the energy storage element, as shown in fig. 3, the energy conversion device includes:
the bridge arm converter 101 is characterized in that first ends of all paths of bridge arms of the bridge arm converter 101 are connected together to form a first bus end, and second ends of all paths of bridge arms of the bridge arm converter 101 are connected together to form a second bus end;
the first end of the energy storage element C1 is connected with the first bus end, and the second end of the energy storage element C1 is connected with the second bus end;
a first end of the motor winding 102 is respectively connected with the middle point of each phase bridge arm of the bridge arm converter 101, a second end of the motor winding 102 is connected with the positive electrode of the battery 103 in a common mode, and the negative electrode of the battery 103 is connected with the first bus end;
the bridge arm converter 101 comprises M bridge arms, a first end of each bridge arm in the M bridge arms is connected with a first junction end of the bridge arm converter 101, a second end of each bridge arm in the M bridge arms is connected with a second junction end of the bridge arm converter 101, each bridge arm comprises two power switch units which are connected in series, the power switch units can be in the types of transistors, IGBTs, MOS tubes and the like, a middle point of each bridge arm is formed between the two power switch units, the motor comprises M-phase windings, the first end of each phase winding in the M-phase windings is connected with the middle point of each bridge arm in a group of the M bridge arms in a one-to-one correspondence mode, the second ends of each phase winding in the M-phase windings are connected with a neutral point, and the neutral point is connected with the positive electrode of the battery 103.
When M is equal to 3, the bridge arm converter 101 is a three-phase inverter, the three-phase inverter includes three bridge arms, a first end of each of the three bridge arms is connected together to form a first junction end of the bridge arm converter 101, and a second end of each of the three bridge arms is connected together to form a second junction end of the bridge arm converter 101; the three-phase inverter comprises a first power switch unit, a second power switch unit, a third power switch unit, a fourth power switch unit, a fifth power switch and a sixth power switch, wherein the first power switch unit and the fourth power switch unit form a first bridge arm, the second power switch unit and the fifth switch unit form a second bridge arm, the third power switch unit and the sixth switch unit form a third bridge arm, one ends of the first power switch unit, the third power switch unit and the fifth power switch unit are connected in common and form a first junction end of the three-phase inverter, and one ends of the second power switch unit, the fourth power switch unit and the sixth power switch unit are connected in common and form a second junction end of the three-phase inverter.
The motor winding 102 comprises three-phase windings, a first end of each phase winding in the three-phase windings is connected with a midpoint of each bridge arm in the three bridge arms in a one-to-one correspondence mode, second ends of each phase winding in the three-phase windings are connected together to form a neutral point, a first end of a first phase winding of the motor winding 102 is connected with the midpoint of the first bridge arm, a first end of a second phase winding of the motor winding 102 is connected with the midpoint of the second bridge arm, and a first end of a third phase winding of the motor winding 102 is connected with the midpoint of the third bridge arm.
The first power switch unit in the three-phase inverter comprises a first upper bridge arm VT1 and a first upper bridge diode VD1, the second power switch unit comprises a second lower bridge arm VT2 and a second lower bridge diode VD2, the third power switch unit comprises a third upper bridge arm VT3 and a third upper bridge diode VD3, the fourth power switch unit comprises a fourth lower bridge arm VT4 and a fourth lower bridge diode VD4, the fifth power switch unit comprises a fifth upper bridge arm VT5 and a fifth upper bridge diode VD5, the sixth power switch unit comprises a sixth lower bridge arm VT6 and a sixth lower bridge diode VD6, the motor is a three-phase four-wire system and can be a permanent magnet synchronous motor or an asynchronous motor, and a three-phase winding is connected to one point and connected with the positive electrode of the battery 103.
In another embodiment, as shown in fig. 4, the energy conversion device further comprises a first switch module 104 and a second switch module 105. A first end of the first switch module 104 is connected to a first end connected to the energy storage element C1, and a second end of the first switch module 104 is connected to the positive electrode of the battery 103; the second switching module 105 is connected between the neutral point of the motor winding 102 and the positive or negative pole of the battery 103.
The first switching module 104 is configured to implement conduction or disconnection between the battery 103 and the energy storage element C1 according to the control signal, so that the battery 103 charges or stops charging the energy storage element C1; the second switch module 105 is configured to implement conduction or disconnection between the motor winding 102 and the battery 103 according to the control signal, so that the battery 103 outputs electric energy to the motor winding 102 or stops outputting electric energy.
In this embodiment, the arm converter 101 and the motor winding 102 in the battery heating circuit can multiplex a three-phase inverter and a motor in the vehicle motor drive circuit, and the energy storage module multiplexes a bus capacitor of the motor drive circuit, and the same modules have different functions. Through the arrangement of the first switch module 104 and the second switch module 105, components are multiplexed to realize multi-function switching, the utilization rate of the bridge arm converter 101 and the motor winding 102 is increased, and the cost is saved.
When the first switch module 104 is turned on and the second switch module 105 is turned off, the battery 103, the first switch module 104, the arm converter 101, the energy storage element C1, and the motor winding 102 form a motor driving circuit, and at this time, the motor output power is realized by controlling the arm converter 101.
When the first switch module 104 is turned off and the second switch module 105 is turned on, the battery 103, the second switch module 105, the motor winding 102, the arm converter 101, and the energy storage element C1 form a battery heating circuit, and at this time, the arm converter 101 is controlled to charge and discharge the battery 101 and the energy storage element C1 to heat the battery.
When the first switch module 104 is turned off and the second switch module 105 is turned on, fig. 4 may be equivalent to fig. 3, the first bus end of the arm converter 101 is connected to the first end of the energy storage element C1, the second bus end of the arm converter 101 is connected to the second end of the energy storage element C1, the first end of the motor winding 102 is connected to the arm converter 101, the second end of the motor winding 102 is connected to the first end of the battery 101, and the second end of the battery 103 is connected to the second bus end of the arm converter 101, so as to form a battery heating circuit.
The battery heating circuit comprises a discharging circuit and a charging circuit, wherein the discharging circuit is that the battery 103 discharges the energy storage element C1 through the motor winding 102 and the bridge arm converter 101, at the moment, current flows out of the battery 103, and the current flows into the energy storage element C1 through the motor winding 102 and the bridge arm converter 101 so as to charge the energy storage element C1; the charging loop is that the energy storage element C1 charges the battery 103 through the motor and the bridge arm converter 101, at this time, current flows out from the energy storage element C1, the current flows into the battery 103 through the bridge arm converter 101 and the motor winding 102, and because internal resistance exists in the battery 103, when the current flows in and out of the battery 103 in the working process of the discharging loop and the charging loop, the internal resistance of the battery 103 generates heat, and further the temperature of the battery 103 is increased.
When the battery heating circuit works, the battery 103, the motor winding 102 and the bridge arm converter 101 form a discharging energy storage loop, and the battery 103, the motor winding 102, the bridge arm converter 101 and the energy storage element C1 form a discharging energy release loop; the energy storage element C1, the bridge arm converter 101, the motor winding 102 and the battery 103 form a charging energy storage loop, and the motor winding 102, the battery 103 and the bridge arm converter 101 form a charging energy release loop.
The discharging circuit comprises a discharging energy storage circuit and a discharging energy release circuit, the charging circuit comprises a charging energy storage circuit and a charging energy release circuit, and when the discharging energy storage circuit is controlled to work by the bridge arm converter 101, the battery 103 outputs electric energy to enable a winding of the motor to store energy; when the bridge arm converter 101 controls the discharging and energy releasing loop to work, the battery 103 discharges and the winding of the motor releases energy to charge the energy storage element C1; when the charging energy storage loop is controlled to work by the bridge arm converter 101, the energy storage element C1 discharges to charge the battery 103, and the winding of the motor winding 102 stores energy; when the charging and energy releasing loop is controlled to work through the bridge arm converter 101, the windings of the motor winding 102 release energy to charge the battery 103. The discharging process of the battery 103 to the energy storage element C1 and the charging process of the energy storage element C1 to the battery 103 are alternately performed by controlling the bridge arm converter 101, so that the temperature of the battery 103 is increased; in addition, the effective value of the current flowing through the battery heating circuit is adjusted by controlling the duty ratio of the PWM control signal of the arm converter 101, the control duty ratio is equivalent to controlling the on-time of the upper arm and the lower arm, and the current in the battery heating circuit is increased or decreased by controlling the on-time of the upper arm or the lower arm to be longer or shorter, so that the heating power generated by the battery 103 can be adjusted.
It should be noted that, in the process of controlling the discharge loop and the charge loop to work, the discharge energy storage loop, the discharge energy release loop, the charge energy storage loop and the charge energy release loop in the discharge loop may be controlled to work in sequence, the effective value of the current flowing through the battery heating circuit is adjusted by controlling the duty ratio of the PWM control signal of the bridge arm converter 101, or the discharge energy storage loop and the discharge energy release loop in the discharge loop may be controlled to be alternately turned on for discharging, the charge energy storage loop and the charge energy release loop in the charge loop are controlled to be alternately turned on for discharging, and the effective values of the current flowing through the discharge loop and the charge loop are respectively adjusted by controlling the duty ratio of the PWM control signal of the bridge arm converter 101.
In the present embodiment, the arm inverter 101 is controlled to operate the battery heating circuit, so that the battery 103 in the discharge circuit discharges the energy storage element C1 and the energy storage element C1 in the charge circuit charges the battery 103, thereby increasing the temperature of the battery 103, and the arm inverter 101 is controlled to adjust the current of the battery 103 from the heating circuit, thereby adjusting the heating power generated by the battery 103.
As a second embodiment of the connection relationship among the arm converter 101, the motor winding 102, and the energy storage element, as shown in fig. 5, a first bus end of the arm converter 101 is connected to a positive electrode of the battery 103, and a second bus end of the arm converter 101 is connected to a negative electrode of the battery 103; a first end of the motor winding 102 is connected with the bridge arm inverter 101, a second end of the motor winding 102 is connected with a first end of the energy storage element C2, and a second end of the energy storage element C2 is connected with a second bus end of the bridge arm inverter 101, so that a battery heating circuit is formed.
The present embodiment is different from the above embodiments in that the connection manner between the modules is different, and the specific structures of the modules are the same, which can be referred to the above embodiments and will not be described herein again.
For the battery heating circuit, the battery heating circuit comprises a discharging loop and a charging loop, wherein the discharging loop is that the battery 103 discharges the energy storage element C2 through the bridge arm converter 101 and the motor winding 102, at the moment, current flows out of the battery 103, and the current flows into the energy storage element C2 through the bridge arm converter 101 and the motor winding 102 to charge the energy storage element C2; the charging loop is that the energy storage element C2 charges the battery 103 through the motor winding 102 and the bridge arm converter 101, at this time, current flows out from the energy storage element C2, and the current flows into the battery 103 through the motor winding 102 and the bridge arm converter 101, because internal resistance exists in the battery 103, when the battery 103 has current flowing in and out in the working process of the discharging loop and the charging loop, the internal resistance of the battery generates heat, and further the temperature of the battery 103 is increased.
As shown in fig. 6, the control method of the energy conversion apparatus includes steps S10 and S20, and includes the following steps:
and S10, when a battery heating instruction is acquired, controlling the bridge arm converter with the initial charging and discharging frequency to charge and discharge the battery and the energy storage element so as to self-heat the battery.
The battery heating instruction is an instruction for enabling the battery and other modules to form a heating circuit and generate heat, when the battery heating instruction is acquired, the battery heating circuit formed by connecting the bridge arm converter, the motor winding and the energy storage element with the battery is in a working state, and the bridge arm converter is controlled through initial charging and discharging frequency to enable the battery heating circuit to be in the working state, wherein the initial charging and discharging frequency can be determined through a plurality of preset charging and discharging frequencies of the battery.
As shown in fig. 7, the step of obtaining the initial charging and discharging frequency includes step S101, step S102, and step S103, and the specific steps are as follows:
s101, acquiring a plurality of charging and discharging frequencies of the battery.
In step S101, the charge and discharge frequency of the battery may be a plurality of values, for example, 50HZ, 95HZ, 250HZ, and the like. There is a corresponding relationship between the charging and discharging frequency of the battery and the effective current value of the battery heating circuit, for example, 50HZ for 50A, 95HZ for 60A, 250HZ for 80A, and so on.
And S102, controlling the bridge arm converter by adjusting the duty ratio of the PWM control signal under each charging and discharging frequency of the battery to obtain a current effective value corresponding to each charging and discharging frequency.
The charging and discharging frequencies of the battery are different and correspond to current effective values in different battery heating circuits, and the duty ratios of different PWM control signals under the same charging and discharging frequency of the battery also correspond to current effective values of different battery heating circuits, so that the charging and discharging frequency of the battery is kept unchanged, and the current effective value flowing through the battery heating circuits can be adjusted by adjusting the duty ratios of the PWM control signals.
S103, obtaining a current effective value corresponding to each charging and discharging frequency, obtaining a maximum current effective value according to the current effective values, and taking the charging and discharging frequency corresponding to the maximum current effective value as an initial charging and discharging frequency.
The duty ratio of the PWM control signal is adjusted under each charging and discharging frequency in sequence, the current effective value corresponding to each duty ratio under the charging and discharging frequency is recorded through the current sensor, a plurality of current effective values corresponding to each charging and discharging frequency are obtained, the maximum current effective value is obtained, and the frequency corresponding to the maximum current effective value is obtained to control the bridge arm converter.
And S20, in the battery heating process, acquiring battery parameters, adjusting the charging and discharging frequency of the battery heating circuit according to the battery parameters, and controlling the bridge arm converter to adjust the current flowing through the battery heating circuit according to the charging and discharging frequency so as to adjust the heating power of the battery.
Wherein the battery parameter comprises the temperature of the battery, the effective current value of the battery or the heating time of the battery.
In step S20, adjusting the charging and discharging frequency of the battery heating circuit according to the battery parameter includes:
and when at least one of the temperature of the battery, the effective current value of the battery or the heating time of the battery reaches a preset condition, re-determining the target charging and discharging frequency corresponding to the maximum effective current under the current battery parameters.
The preset conditions corresponding to the temperature of the battery are as follows: temperature rise of battery C1;
the preset conditions corresponding to the effective current value of the battery are as follows: the effective current value of the battery drops a 1;
the preset conditions corresponding to the heating time of the battery are as follows: the heating time of the battery is increased by T1.
For example, the temperature of the battery is collected through a temperature sensor, and when the rise value of the temperature of the battery is detected to reach 5 ℃, the battery is regarded as reaching the preset condition; obtaining the effective current value of the battery through a current sensor, and when the effective current value of the battery is reduced to 5A, determining that a preset condition is reached; the heating time of the battery is detected through the timer, when the heating time of the battery reaches 3 minutes, the preset condition is considered to be reached, wherein the collection interval time of the battery temperature and the current collection is at least longer than one charge-discharge period of the battery. And when the parameters are detected to reach the preset conditions, adjusting the charging and discharging frequency of the battery.
As an embodiment, as shown in fig. 8, the re-determining the target charging and discharging frequency corresponding to the maximum effective current under the current battery parameters includes:
step S201, a plurality of charging and discharging frequencies of the battery are obtained again.
In step S201, a plurality of charging/discharging frequencies of the battery are newly acquired. For example, the charge/discharge frequencies are 50HZ, 95HZ, 250HZ, 500HZ, 666HZ, 760HZ, 850HZ, 1000HZ, and 1300 HZ.
And S202, controlling the bridge arm converter by adjusting the duty ratio of the PWM control signal under each charging and discharging frequency of the battery to obtain a current effective value corresponding to each charging and discharging frequency.
The charging and discharging frequency of the battery is kept unchanged, and the effective value of the current flowing through the battery heating circuit can be adjusted by adjusting the duty ratio of the PWM control signal.
Step S203, obtaining a current effective value corresponding to each charging and discharging frequency under the current battery parameters, obtaining a maximum current effective value according to the current effective value, and taking the charging and discharging frequency corresponding to the maximum current effective value as an initial charging and discharging frequency.
The duty ratio of the PWM control signal is adjusted under each charging and discharging frequency in sequence, the current effective value corresponding to each duty ratio under the charging and discharging frequency is recorded through the current sensor, a plurality of current effective values corresponding to each charging and discharging frequency are obtained, the maximum current effective value is obtained, and the frequency corresponding to the maximum current effective value is obtained to control the bridge arm converter.
The technical effect of the embodiment is that when the inductance and capacitance of the system circuit change, the charging and discharging frequency of the battery is adjusted in real time to change from dozens of hertz to one kilohertz, the duty ratio is adjusted in each charging and discharging frequency of the battery to obtain the effective current value, the effective current value is compared to obtain the maximum effective current value, the bridge arm converter is controlled according to the duty ratio corresponding to the maximum effective current value, and further the system performs battery self-heating at the charging and discharging frequency close to the resonant frequency point of the circuit, thereby ensuring the optimal value of the output battery heating current, and finally realizing better battery self-heating effect. In addition, the method can improve the heating speed, has high efficiency, and avoids the problems of adverse effects on electronic devices and battery packs in the circuit and reduction of the service life caused by motor torque pulsation and excessive current spike.
An embodiment of the present application provides a control method of an energy conversion device, where the energy conversion device includes a bridge arm converter, a motor winding and an energy storage element, the motor winding, the energy storage element and a battery are connected to form a battery heating circuit, and the control method includes: when a battery heating instruction is obtained, controlling the bridge arm converter at an initial charging and discharging frequency to charge and discharge the battery and the energy storage element so as to self-heat the battery; in the battery heating process, battery parameters are obtained, the charging and discharging frequency of the battery heating circuit is adjusted according to the battery parameters, and the bridge arm converter is controlled to adjust the current flowing through the battery heating circuit according to the charging and discharging frequency so as to adjust the heating power of the battery. According to the bridge arm converter, the bridge arm converter is adjusted according to the change of the battery parameters, the charging and discharging frequency of the battery is adjusted, the heating power of the battery is controlled, and the problems of low heating efficiency and high noise of the battery in the heating process of the battery are solved.
The present embodiment will be described in detail below with reference to specific circuit configurations:
as shown in fig. 3, the energy conversion device includes an arm converter 101, a motor winding 102, a bus capacitor C1, and a capacitor C1, where a first end of the arm converter 101 is connected to a first bus end of the arm converter 101, a midpoint of three arms of the arm converter 101 is connected to three coils of the motor winding 102, respectively, a connection point of the three coils of the motor winding 102 is connected to a first end of a battery 103, and a second end of the battery 103 is connected to a second bus end of the arm converter 101 and a second end of the bus capacitor C1.
Wherein, the bridge arm converter 101 comprises a first power switch unit, a second power switch unit, a third power switch unit, a fourth power switch unit, a fifth power switch unit and a sixth power switch unit, the first power switch unit and the fourth power switch unit form a first bridge arm, the third power switch unit and the sixth power switch unit form a second bridge arm, the fifth power switch unit and the second power switch unit form a third bridge arm, one end of the first power switch unit, one end of the third power switch unit and one end of the fifth power switch unit are connected in common and form a first current sink end of the bridge arm converter, one end of the second power switch unit, one end of the fourth power switch unit and one end of the sixth power switch unit are connected in common and form a second current sink end of the bridge arm converter, a first phase coil of the motor 102 is connected with a first bridge arm, a second phase coil of the motor 102 is connected with a midpoint of the second bridge arm, the third phase coil of motor 102 is connected to the midpoint of the third leg.
The first power switch unit in the bridge arm converter 101 comprises a first upper bridge arm VT1 and a first upper bridge diode VD1, the second power switch unit comprises a second lower bridge arm VT2 and a second lower bridge diode VD2, the third power switch unit comprises a third upper bridge arm VT3 and a third upper bridge diode VD3, the fourth power switch unit comprises a fourth lower bridge arm VT4 and a fourth lower bridge diode VD4, the fifth power switch unit comprises a fifth upper bridge arm VT5 and a fifth upper bridge diode VD5, the sixth power switch unit comprises a sixth lower bridge arm VT6 and a sixth lower bridge diode VD6, the three-phase alternating current motor is a three-phase four-wire system, can be a permanent magnet synchronous motor or an asynchronous motor, and a neutral line is led out from a connection midpoint of a three-phase coil.
The first stage is the work of a discharge energy storage loop: as shown in fig. 9, when the lower arm of arm converter 101 is on, a current flows from the positive electrode of battery 103, passes through motor 102 and the lower arm of arm converter 101 (second lower arm VT2, fourth lower arm VT4, and sixth lower arm VT6), and flows back to the negative electrode of battery 103, and the current increases.
The second stage is the work of a discharging follow current loop: as shown in fig. 10, when the lower arm of the arm converter 101 is turned off and the upper arm is turned on, the current starts from the positive electrode of the battery 103, and passes through the motor 102 and the upper arm (the first upper diode VD1, the third upper diode VD3, and the fifth upper diode VD5) of the arm converter 101 to charge the positive electrode of the bus capacitor C1, the current is continuously reduced to zero, the inductive energy storage is reduced to zero, the winding inductance of the battery 103 and the winding inductance of the motor 102 are jointly discharged to charge the bus capacitor C1, and the voltage of the bus capacitor C1 is increased to a certain maximum value.
The third stage is the work of the charging energy storage loop: as shown in fig. 11, when the lower arm of the arm converter 101 is controlled to be open, the upper arm is controlled to be closed, and the upper arm of the arm converter 101 is controlled to be open, the current starts from the positive electrode of the bus capacitor C1, passes through the upper arm (the first upper arm VT1, the third upper arm VT3, and the fifth upper arm VT5) of the arm converter 101, and the motor 102, and then charges the positive electrode of the battery 103, the current increases first and then decreases continuously, and the voltage of the bus capacitor C1 decreases continuously.
The fourth stage is that the charging follow current loop works: as shown in fig. 12, when the lower arm of the arm converter 101 is turned on, a current flows from the negative electrode of the battery 103, flows through the lower arm of the arm converter 101 (the second lower diode VD2, the fourth lower diode VD4, and the sixth lower diode VD6), and flows back to the positive electrode of the battery from the motor 102, and the current decreases, so that the voltage of the bus capacitor C1 decreases.
The battery 103 is discharged to the outside in the first stage and the second stage, and the discharge current reaches the maximum at the end of the first stage, the battery 103 is charged in the third stage and the fourth stage, and the charge current reaches the maximum at a certain time in the third stage; in the second stage, the bus capacitor C1 is charged, the voltage of the bus capacitor C1 is increased to the highest, in the third stage, the bus capacitor C1 is discharged, and the voltage of the bus capacitor C1 is reduced to the lowest.
The upper and lower arms of the arm converter 101 are controlled by complementary pulses, and on the premise that the control period is not changed, the longer the on-time of the lower arm, the larger the maximum value of the charging and discharging current of the battery 103, and at the same time, the higher the highest voltage of the bus capacitor C1, the larger the maximum value of the charging and discharging current of the battery 103 will be, and the larger the heating power of the internal resistance of the battery 103 will be. Conversely, the shorter the on-time of the lower arm, the smaller the maximum value of the charge/discharge current of battery 103, and the smaller the maximum voltage of bus capacitor C1, the smaller the maximum value of the charge/discharge current of battery 103, and the smaller the heat generation power of the internal resistance of battery 103.
From the above, on the premise of a certain control cycle, the charging and discharging current of the battery is mainly adjusted by controlling the duty ratio, and the internal heat generation power of the battery is in positive correlation with the conduction time of the lower bridge arm. The control period is mainly determined by the alternating current internal resistance of the battery, the control period is selected by taking the maximum heating power as a target, but the control period influences the variation range of the capacitor voltage, and the variation range of the capacitor voltage and the period are in a negative correlation relationship. The duty ratio of the lower bridge arm is increased, so that the charging and discharging current of the battery can be improved, namely the internal heating power of the battery is increased, and conversely, the duty ratio of the lower bridge arm is reduced, so that the charging and discharging current of the battery can be reduced, namely the internal heating power of the battery is reduced. In the whole heating process, the states of related parts such as an electric controller, a motor and the like are monitored in real time, and if the abnormal conditions of current, voltage and temperature occur, the heating is immediately stopped, so that the heating safety is ensured.
The four processes are continuously circulated, so that the battery is continuously and rapidly charged and discharged, and the battery is rapidly heated due to the large amount of heat generated by the internal resistance of the battery.
The control strategy that the charging and discharging frequency can be adjusted in real time provided by the application is that the IGBT is controlled through software so as to realize the self-heating function of the battery, and the specific implementation steps are as follows:
the debugging control phase of the system is introduced below, the main task of the debugging control phase is to control the IGBT according to the control strategy of the patent, so as to realize the charging and discharging functions of the battery, and the specific debugging steps are as follows:
step 1: the hardware circuitry of the connection system according to fig. 3 ensures that the various components function well.
Step 2: and (4) configuring the carrier frequency of the system, and calculating a corresponding period value T in the program.
And step 3: the charge and discharge frequency values of the given system are respectively F1-50 HZ, F2-95 HZ, F3-250 HZ, F4-500 HZ, F5-666 HZ, F6-760 HZ, F7-830 HZ, F8-1000 HZ, and F9-1250 HZ.
And 4, step 4: according to the input and output voltage levels, in combination with the control principle of the hardware circuit of the current system, an initial duty ratio M of a control signal is given, a counter of the control period configuration controller is calculated according to the step 2, and a comparison value of the counter (the comparison value is used for changing the duty ratio of the control signal) is determined.
And 5: according to the given 9 charge-discharge frequency values, a control signal is applied to an electrically controlled three-phase bridge arm in each charge-discharge frequency (the control of the three-phase bridge arm is kept consistent), the effective value of the charge-discharge current is changed by adjusting the duty ratio to achieve the charge-discharge function of the battery, and the maximum values of the battery heating current under the corresponding frequencies are respectively calculated and are respectively marked as T1, T2, T3, T4, T5, T6, T7, T8 and T9.
Step 6: and comparing the effective values of the heating currents of the 9 batteries, and selecting the charging and discharging frequency corresponding to the maximum value of the current to perform self-heating on the batteries. The frequency point is the resonance frequency point of the system circuit in the current capacitance inductance value state, namely, the effective current value of the battery is the maximum under the frequency.
And 7: in the charging and discharging process, state parameters such as battery temperature rise, battery heating current value, battery heating time, motor three-phase current value, C1 capacitor side current value, voltage values at two ends of a battery, voltage values at two ends of a C1 capacitor, temperature of a motor winding and an IGBT (insulated gate bipolar translator) are monitored at any time. When one of the following three cases is satisfied, the process returns to step 5, and 9 battery heating current values T1-T9 are recalculated. The three cases include: firstly, the temperature of the battery rises to be more than 5 ℃; the reduction value of the heating current value of the battery is 5A; and thirdly, the heating time of the battery is more than 3 min.
When the temperature sensor of the battery acquires that the temperature rise of the battery is more than 5 ℃, the charging and discharging frequency is adjusted once; after a further increase in temperature of 5 degrees celsius, the adjustment is carried out again.
The current sensor of the battery collects the effective current value drop value 5A of the battery, and then the charging and discharging frequency is adjusted once; after the effective current value is reduced by 5A again, adjusting again;
or when the battery heating timing exceeds 3min, the charging and discharging frequency is adjusted once; adjusting again when the heating time exceeds the next 3 min;
the collection interval time of the battery temperature collection and the current collection is at least more than one charge-discharge period.
And 8: and if the three conditions in the step 7 are not met, continuously performing subsequent battery self-heating at the current charging and discharging frequency until the heating is finished.
And step 9: after the self-heating of the battery is completed, the duty ratio of the control signals of the three-phase bridge arm of the bridge arm converter is gradually reduced to gradually reduce the effective value of the charging and discharging current of the battery until the effective value is 0, and the charging and discharging process of the battery is finished.
The upper bridge arm and the lower bridge arm of the three-phase bridge arm of the bridge arm converter are controlled by complementary pulses, and on the premise that the control period is not changed, the longer the switching-on time of the lower bridge arm is, the larger the maximum value of the charging and discharging current of the battery is, and meanwhile, the higher the highest voltage of the capacitor is, the larger the maximum value of the charging and discharging current of the battery is, and the larger the heating power of the internal resistance of the battery is. Conversely, the shorter the on-time of the lower arm, the smaller the maximum value of the charge and discharge current of the battery, and the smaller the maximum voltage of the capacitor, the smaller the maximum value of the charge and discharge current of the battery, and the smaller the heating power of the internal resistance of the battery.
The problem that when external conditions change, the effective value of the original ideal battery heating current cannot be output by the original battery charging and discharging frequency is solved. First, the system will output a more ideal effective value of the battery heating current only when the system is near its resonant frequency, for example, the resonant frequency of the system is around 760HZ under the current combination of the inductance and capacitance. The resonant frequency of the system is determined only by the inherent parameters of the circuit, namely the inductance and the capacitance, and when the internal inductance and the capacitance of the system hardware are changed, the resonant frequency of the system is changed. In the self-heating process of the battery, as the heating time is increased, the capacitance value in the system structure and the inductance value of the motor are changed. Likewise, as the vehicle ages, the inductance of the motor changes. When the vehicle is charged by the OBC, the inductance value of the system is changed after the charging cabinet is connected. For the three situations, when the capacitance and the inductance are changed, the corresponding system resonant frequency is also changed. Therefore, the ideal battery heating current cannot be output under the original battery charging and discharging frequency. The novel control method can adaptively adjust the charging and discharging frequency of the battery, so that when external conditions (such as ambient temperature, vehicle service life and whether OBC charging is carried out) change, the charging and discharging frequency around a resonance frequency point corresponding to different capacitance and inductance values is automatically searched, and a control system outputs a better battery heating current effective value around the resonance frequency point, so that a good battery self-heating effect is achieved.
An embodiment of the present invention further provides an energy conversion apparatus, where the energy conversion apparatus includes:
the bridge arm converter, the motor winding and the energy storage element are connected with the battery to form a battery heating circuit;
the energy conversion device further comprises a control module for:
acquiring a vehicle state;
when the vehicle is in a heating mode, controlling the bridge arm converter to regulate the current flowing through the battery heating circuit, so that the battery and the energy storage element are charged and discharged, and the battery is self-heated;
and acquiring battery parameters, and adjusting the bridge arm converter according to the battery parameters to adjust the heating power of the battery.
The specific control method of the controller may refer to the above control method, and is not described herein again.
The bridge arm converter comprises an N-phase bridge arm, the motor winding comprises N-phase windings, and the N-phase bridge arm and the N-phase windings are connected in a one-to-one corresponding mode.
In one embodiment, the bridge arm converter, the motor winding, the energy storage element and the battery are connected to form a battery heating circuit, which specifically includes: the first ends of the N-phase bridge arms are connected together to form a first bus end, the first bus end is connected with the first ends of the energy storage elements, the second ends of the N-phase bridge arms are connected together to form a second bus end, the second bus end is connected with the second ends of the energy storage elements, the first ends of the N-phase windings are respectively connected to the middle points of the N-phase bridge arms in a one-to-one correspondence mode, the second ends of the N-phase windings are connected to the positive electrode of the battery, and the negative electrode of the battery is connected to the second bus end.
In another embodiment, the bridge arm converter, the motor winding, the energy storage element and the battery are connected to form a battery heating circuit, which specifically comprises:
the first ends of the N-phase bridge arms are connected together to form a first bus end, the first bus end is connected with the anode of the battery, the second ends of the N-phase bridge arms are connected together to form a second bus end, the second bus end is connected with the cathode of the battery, the first ends of the N-phase windings are respectively connected to the middle points of the N-phase bridge arms in a one-to-one correspondence mode, the second ends of the N-phase windings are connected to the first ends of the energy storage elements, and the second ends of the energy storage elements are connected to the second bus end.
The third embodiment of the invention also provides a vehicle which comprises the energy conversion device provided by the first embodiment.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. A control method of an energy conversion apparatus, characterized in that the energy conversion apparatus includes:
the bridge arm converter, the motor winding and the energy storage element are connected with a battery to form a battery heating circuit;
the control method comprises the following steps:
when a battery heating instruction is obtained, controlling the bridge arm converter at an initial charging and discharging frequency to charge and discharge the battery and the energy storage element so as to self-heat the battery;
in the battery heating process, the battery parameters are obtained, the charging and discharging frequency of the battery heating circuit is adjusted according to the battery parameters, and the bridge arm converter is controlled to adjust the current flowing through the battery heating circuit according to the charging and discharging frequency so as to adjust the heating power of the battery.
2. The control method according to claim 1, wherein before the step of controlling the bridge arm converter at the initial charging and discharging frequency to charge and discharge the battery and the energy storage element, the method further comprises: acquiring the initial charging and discharging frequency;
the acquiring the initial charging and discharging frequency specifically includes:
acquiring a plurality of charging and discharging frequencies of the battery;
controlling the bridge arm converter to obtain a current effective value corresponding to each charging and discharging frequency by adjusting the duty ratio of a PWM control signal under each charging and discharging frequency of the battery;
and acquiring the current effective value corresponding to each charging and discharging frequency, acquiring a maximum current effective value according to the current effective value, and taking the charging and discharging frequency corresponding to the maximum current effective value as the initial charging and discharging frequency.
3. The control method of claim 2, wherein said obtaining the battery parameter comprises:
and acquiring the temperature of the battery, the effective current value of the battery or the heating time of the battery.
4. The control method of claim 3, wherein said adjusting a charging and discharging frequency of said battery heating circuit based on said battery parameter comprises:
when at least one of the temperature of the battery, the effective current value of the battery or the heating time of the battery reaches a corresponding preset condition, re-determining a target charging and discharging frequency corresponding to the maximum effective current under the current battery parameters;
and adjusting the charging and discharging frequency of the battery heating circuit to a target charging and discharging frequency.
5. The control method according to claim 4,
the preset conditions corresponding to the temperature of the battery are as follows: temperature rise of battery C1;
the preset conditions corresponding to the effective current value of the battery are as follows: the effective current value of the battery drops a 1;
the preset conditions corresponding to the heating time of the battery are as follows: the heating time of the battery is increased by T1.
6. The control method of claim 5, wherein said re-determining the target charge-discharge frequency corresponding to the maximum available current at the current battery parameter comprises:
reacquiring a plurality of charging and discharging frequencies of the battery;
controlling the bridge arm converter by adjusting the duty ratio of a PWM control signal under each charging and discharging frequency of the battery to obtain a current effective value corresponding to each charging and discharging frequency under the current battery parameter;
acquiring a current effective value corresponding to each charging and discharging frequency under the current battery parameters, and acquiring a maximum current effective value according to the current effective value;
and taking the charging and discharging frequency corresponding to the maximum current effective value as the target charging and discharging frequency.
7. The control method according to claim 1, wherein the bridge arm converter, the motor winding, the energy storage element and the battery are connected to form a battery heating circuit, and the control method specifically comprises: the first ends of the N-phase bridge arms are connected in common to form a first confluence end, the first confluence end is connected with the first end of the energy storage element, the second ends of the N-phase bridge arms are connected in common to form a second confluence end, the second confluence end is connected with the second end of the energy storage element, the first ends of the N-phase windings are respectively connected to the middle points of the N-phase bridge arms in a one-to-one correspondence mode, the second ends of the N-phase windings are connected to the positive electrode of the battery, and the negative electrode of the battery is connected to the second confluence end.
8. The control method according to claim 1, wherein the bridge arm converter, the motor winding, the energy storage element and the battery are connected to form a battery heating circuit, and the control method specifically comprises:
the first ends of the N-phase bridge arms are connected in common to form a first bus end, the first bus end is connected with the positive electrode of the battery, the second ends of the N-phase bridge arms are connected in common to form a second bus end, the second bus end is connected with the negative electrode of the battery, the first ends of the N-phase windings are respectively connected to the middle points of the N-phase bridge arms in a one-to-one correspondence mode, the second ends of the N-phase windings are connected to the first ends of the energy storage elements, and the second ends of the energy storage elements are connected to the second bus end.
9. An energy conversion device, characterized in that the energy conversion device comprises:
the bridge arm converter, the motor winding and the energy storage element are connected with a battery to form a battery heating circuit;
the energy conversion device further comprises a control module configured to:
when a battery heating instruction is obtained, controlling the bridge arm converter at an initial charging and discharging frequency to charge and discharge the battery and the energy storage element so as to self-heat the battery;
in the battery heating process, the battery parameters are obtained, the charging and discharging frequency of the battery heating circuit is adjusted according to the battery parameters, and the bridge arm converter is controlled to adjust the current flowing through the battery heating circuit according to the charging and discharging frequency so as to adjust the heating power of the battery.
10. A vehicle characterized by comprising the energy conversion apparatus of claim 9.
CN202010717036.7A 2020-07-23 2020-07-23 Vehicle, energy conversion device, and control method therefor Pending CN113972707A (en)

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WO2024066326A1 (en) * 2022-09-29 2024-04-04 比亚迪股份有限公司 Battery self-heating device and vehicle

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