WO2023202304A1 - 充放电电路的控制方法、装置、设备、系统及存储介质 - Google Patents

充放电电路的控制方法、装置、设备、系统及存储介质 Download PDF

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Publication number
WO2023202304A1
WO2023202304A1 PCT/CN2023/082750 CN2023082750W WO2023202304A1 WO 2023202304 A1 WO2023202304 A1 WO 2023202304A1 CN 2023082750 W CN2023082750 W CN 2023082750W WO 2023202304 A1 WO2023202304 A1 WO 2023202304A1
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WO
WIPO (PCT)
Prior art keywords
current
value
charge
bridge arm
current value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2023/082750
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English (en)
French (fr)
Inventor
赵元淼
黄孝键
李占良
颜昱
但志敏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co Ltd
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Filing date
Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Priority to EP23790965.0A priority Critical patent/EP4501694A4/en
Publication of WO2023202304A1 publication Critical patent/WO2023202304A1/zh
Priority to US18/896,941 priority patent/US20250018817A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B60L53/24—Using the vehicle's propulsion converter for charging
    • 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/50—Charging stations characterised by energy-storage or power-generation means
    • B60L53/53—Batteries
    • 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/50—Charging stations characterised by energy-storage or power-generation means
    • B60L53/55—Capacitors
    • 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries for charging batteries from AC mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering using capacitors as storage or buffering devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/90—Regulation of charging or discharging current or voltage
    • H02J7/94—Regulation of charging or discharging current or voltage in response to battery current
    • 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
    • B60L2210/00—Converter types
    • B60L2210/40—DC to AC converters
    • 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
    • B60L2220/00—Electrical machine types; Structures or applications thereof
    • B60L2220/50—Structural details of electrical machines
    • B60L2220/54—Windings for different functions
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Details of circuit arrangements for charging or discharging batteries or supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Details of circuit arrangements for charging or discharging batteries or supplying loads from batteries
    • H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/60—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements
    • H02J7/62—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements against overcurrent
    • 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

Definitions

  • This application relates to the field of battery technology, and specifically to a control method, device, equipment, system and storage medium for a charge and discharge circuit.
  • power batteries have become increasingly popular in many fields, especially in electric vehicles such as electric vehicles.
  • Power batteries have the advantages of high energy density and good environmental protection effect.
  • the charging and discharging power and capacity of the power battery are greatly attenuated at low temperatures. Therefore, it is usually necessary to charge and discharge the power battery to achieve self-heating of the power battery.
  • the existing technology lacks a control scheme to deal with abnormal current values in the charging and discharging of power batteries. When abnormal current values occur during the charging and discharging process of the power battery, the current cannot be adjusted in time, resulting in easy damage to the circuit.
  • this application provides a control method, device, equipment, system and storage medium for a charging and discharging circuit, which can solve the problem in the prior art that the current cannot be adjusted in time when abnormal current values occur during the charging and discharging process of the power battery. , leading to problems that easily damage the circuit.
  • a simplified summary is provided below. This summary is not intended to be an extensive review, nor is it intended to identify key/important elements or to delineate the scope of these embodiments. Its sole purpose is to present a few concepts in a simplified form as a prelude to the more detailed explanation that follows.
  • a first aspect of the embodiment of the present application provides a method for controlling a charge and discharge circuit.
  • the neutral line of the motor in the charge and discharge circuit is connected to the charge and discharge switching bridge arm group.
  • the method includes:
  • the first current value in the neutral line is obtained in real time
  • the first peak current and the second peak current regulate the size of the first current value
  • the first peak current is a known peak current of the charge-discharge switching bridge arm group
  • the second peak current is a known peak current of the neutral line
  • the control method in the embodiment of the present application switches the bridge arm according to the first current value in the neutral line, charge and discharge
  • the known peak current of the group and the known peak current of the neutral line regulate the size of the first current value, so that when an abnormal current value occurs during the charging and discharging process of the power battery, the current can be adjusted in time to avoid damaging the circuit.
  • regulating the size of the first current value according to the first current value, the first peak current and the second peak current includes:
  • each of the first preset values is less than or equal to the first peak current, and each of the second preset values is less than or equal to the second peak current; all of the first preset values and all of the The second preset values have a one-to-one correspondence; each first preset value is correspondingly set with a preset safety value.
  • the current size of charging and discharging can be controlled with higher accuracy.
  • the preset safety value corresponding to the first current value is determined based on the magnitude relationship between the first current value and all first preset values and all second preset values, include:
  • a maximum first preset value less than the first current value is determined from all first preset values, and a maximum second preset value less than the first current value is determined from all second preset values.
  • the method before obtaining the first current value in the neutral line in real time during the process of charging and discharging the power battery by the charging and discharging circuit, the method further includes:
  • each of the preset safety values is less than or equal to the requested current value. Limiting each preset safety value according to the requested current value sent by the battery management system can ensure that the setting of each preset safety value is more reasonable and improve the safety of charging and discharging.
  • obtaining the first current value in the neutral line in real time includes: receiving the first current value detected in real time by a current detection module.
  • the first current value is detected in real time by the current detection module to obtain an accurate first current value.
  • the real-time acquisition of the first current value in the neutral line includes:
  • the current value of each winding is detected in real time through the current detection module, and the first current value is obtained by summing, which is more accurate.
  • adjusting the first current value to the determined preset safety value includes:
  • the regulating the current charge and discharge cycle includes: regulating the alternating formation frequency of the charging circuit and the discharging circuit. Regulating the alternating frequency of the charging loop and the discharging loop can ensure higher control accuracy.
  • a second aspect of the embodiment of the present application provides a control device for a charge and discharge circuit.
  • the neutral line of the motor in the charge and discharge circuit is connected to the charge and discharge switching bridge arm group.
  • the device includes:
  • a current value acquisition module configured to acquire the first current value in the neutral line in real time during the process of charging and discharging the power battery by the charging and discharging circuit;
  • a current control module configured to control the size of the first current value according to the first current value, the first peak current and the second peak current
  • the first peak current is a known peak current of the charge-discharge switching bridge arm group
  • the second peak current is a known peak current of the neutral line
  • the control device of the second aspect can implement the control method of the first aspect, and regulate the first current according to the first current value in the neutral line, the known peak current of the charge-discharge switching bridge arm group, and the known peak current of the neutral line. value, so that when an abnormal current value occurs during the charging and discharging process of the power battery, the current can be adjusted in time to avoid damaging the circuit.
  • a third aspect of the embodiment of the present application provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor.
  • the processor executes the program to Implement the control method of the charging and discharging circuit of the first aspect.
  • the electronic device of the third aspect can implement the control method of the first aspect, and regulate the first current according to the first current value in the neutral line, the known peak current of the charge and discharge switching bridge arm group, and the known peak current of the neutral line. value, so that when an abnormal current value occurs during the charging and discharging process of the power battery, the current can be adjusted in time to avoid damaging the circuit.
  • a fourth aspect of the embodiment of the present application provides a control system for a charge and discharge circuit, including a control module and a charge and discharge circuit connected to each other.
  • the neutral line of the motor in the charge and discharge circuit is connected to the charge and discharge switching bridge arm group;
  • the control module is used to execute the control method of the charging and discharging circuit of the first aspect.
  • the control system of the fourth aspect can implement the control method of the first aspect, and regulate the first current according to the first current value in the neutral line, the known peak current of the charge-discharge switching bridge arm group, and the known peak current of the neutral line. value, so that when an abnormal current value occurs during the charging and discharging process of the power battery, the current can be adjusted in time to avoid damaging the circuit.
  • the charge-discharge switching bridge arm group includes an upper bridge arm and a lower bridge arm connected in series, and the connection point of the upper bridge arm and the lower bridge arm is connected to the neutral line.
  • the upper bridge arm includes a first switch and a first diode connected in parallel
  • the lower bridge arm includes a second switch and a second diode connected in parallel
  • the cathode of the first diode is connected to the anode of the power battery, the anode of the first diode is connected to the cathode of the second diode, and the anode of the second diode Connected to the negative pole of the power battery.
  • the motor is an M-phase motor;
  • the charge and discharge circuit also includes an M-phase bridge arm circuit, each phase bridge arm circuit includes an upper bridge arm and a lower bridge arm connected in series; the M-phase bridge arm The M upper and lower bridge arm connection points of the circuit are connected to the M-phase motor windings in one-to-one correspondence.
  • the charge and discharge circuit further includes a current detection module, which is connected in series between the neutral line and the charge and discharge switching bridge arm group.
  • the charge and discharge circuit further includes a capacitor connected in parallel with the power battery.
  • a fifth aspect of the embodiments of the present application provides a computer-readable storage medium on which a computer program is stored, and the program is executed by a processor to implement the control method of the charge and discharge circuit described in the first aspect.
  • the computer-readable storage medium of the fifth aspect can implement the control method of the first aspect, and regulate according to the first current value in the neutral line, the known peak current of the charge and discharge switching bridge arm group, and the known peak current of the neutral line.
  • the size of the first current value enables the current to be adjusted in time when an abnormal current value occurs during the charging and discharging process of the power battery to avoid damaging the circuit.
  • the control method of the charge and discharge circuit provided by the embodiment of the present application regulates the first current value according to the first current value in the neutral line, the known peak current of the charge and discharge switching bridge arm group, and the known peak current of the neutral line. size, so that when the current value is abnormal during the charging and discharging process of the power battery, the current can be adjusted in time to avoid damaging the circuit.
  • Figure 1 shows a flow chart of a control method for a charge and discharge circuit in some embodiments of the present application
  • Figure 2 shows a schematic diagram of a discharge circuit in some embodiments of the present application
  • FIG. 3 shows a schematic diagram of the charging circuit of some embodiments of the present application.
  • FIG 4 shows the flow chart of step S20 in Figure 1;
  • FIG. 5 shows the flow chart of step S201 in Figure 4.
  • Figure 6 shows a schematic diagram of the connection structure of the charge and discharge circuit, power battery and control module in some embodiments of the present application
  • Figure 7 shows a schematic diagram of the connection structure of the charge and discharge circuit, power battery and control module in some embodiments of the present application
  • Figure 8 shows a structural block diagram of a control device for a charge and discharge circuit in some embodiments of the present application
  • Figure 9 shows a structural block diagram of an electronic device according to some embodiments of the present application.
  • Figure 10 shows a schematic diagram of a computer-readable storage medium according to some embodiments of the present application.
  • an embodiment means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. This phrase appears inconsistently in various places in the instructions All refer to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.
  • multiple refers to more than two (including two).
  • multiple groups refers to two or more groups (including two groups), and “multiple pieces” refers to It is more than two pieces (including two pieces).
  • Power batteries have the advantages of high power, high energy density, and good environmental protection effect, and have been widely used in new energy vehicles, consumer electronics, energy storage systems and other technical fields. Power batteries can be used in, but are not limited to, vehicles, ships, aircraft and other electrical devices.
  • Electric vehicles powered by power batteries have the advantages of good environmental protection, low noise, low cost, and can effectively promote energy conservation and emission reduction. They have huge market application prospects and are conducive to sustainable economic development. Due to the electrochemical characteristics of power batteries, the performance of power batteries is greatly limited when the temperature is low, seriously affecting their use in low-temperature environments. Therefore, in order to use the power battery normally, the power battery needs to be heated in a low-temperature environment. The inventor found that when heating a power battery in the prior art, there is a lack of solutions for dealing with abnormal current conditions during the charging and discharging process, such as excessive current. When an abnormal current value occurs during the charging and discharging process of the power battery, it is impossible to respond promptly.
  • the current is adjusted, which can easily damage the circuit and easily cause safety hazards caused by abnormal current conditions, resulting in low charging and discharging safety. For example, if the current value is too large during the charging and discharging process and exceeds the safety threshold, it may cause problems such as circuit damage, and in severe cases, even cause safety accidents such as circuit fires. Therefore, there is an urgent need to solve these problems in the existing technology.
  • embodiments of the present application provide a control method for a charge and discharge circuit, based on the first current value in the neutral line, the known peak current of the charge and discharge switching bridge arm group, and the known peak current of the neutral line.
  • the size of the first current value is controlled, so that when an abnormal current value occurs during the charging and discharging process of the power battery, the current can be adjusted in time to avoid damaging the circuit.
  • one embodiment of the present application provides a control method for a charge and discharge circuit.
  • the neutral line of the motor in the charge and discharge circuit is connected to the charge and discharge switching bridge arm group.
  • the execution body of the control method for the charge and discharge circuit is Can be a control module.
  • the control module may be, for example, a controller, a processor, etc.
  • control method includes steps S10 to S20:
  • the charge and discharge circuit may include M-phase motor windings and M bridge arm groups of the motor inverter module. M is a positive integer.
  • the charge and discharge circuit may also include a capacitor connected in parallel with the battery. Each winding is connected to the upper and lower bridge arm connection points of the corresponding bridge arm group. M can be, for example, 3, or other positive integers. In this embodiment, M is 3 as an example, that is, a three-phase motor winding.
  • the first current value in the neutral line is the charge and discharge current value of the charge and discharge circuit.
  • the neutral line of the M-phase motor winding and the upper and lower bridge arm connection points of the charge and discharge switching bridge arm group are connected in sequence.
  • Each bridge arm group includes an upper bridge arm and a lower bridge arm connected in series.
  • the upper and lower bridge arm connection points of each bridge arm group are connected to the corresponding windings in the M-phase motor windings. .
  • the charge and discharge circuit may further include at least one energy storage element connected in series between the first current detection unit and the neutral line of the M-phase motor winding.
  • the energy storage element may be, for example, an inductor or a capacitor.
  • the upper and lower bridge arms of the charge and discharge switching bridge arm group are used to turn on or off when triggered by the charge and discharge enable signal.
  • the upper bridge arm includes a first switch and the lower bridge arm includes a second switch; or the upper bridge arm includes a first switch and a first diode connected in parallel, and the lower bridge arm includes a second switch and a second diode connected in parallel;
  • the cathode of the first diode is connected to the anode of the power battery, the anode of the first diode is connected to the cathode of the second diode, and the anode of the second diode is connected to the cathode of the power battery.
  • the power battery includes at least one battery pack.
  • V1, V2,...V8 are used as switches, and IGBT tubes and other components that can play a switching role can be used; D1, D2,...D8 can all use diodes.
  • the upper bridge arm of the charge and discharge switching bridge arm group is the parallel connected V7 and D7, and the lower bridge arm of the charge and discharge switching bridge arm group is the parallel connected V8 and D8.
  • the upper bridge arm of the first bridge arm group includes parallel connected V1 and D1
  • the lower bridge arm of the first bridge arm group includes parallel connected V4 and D4
  • the second bridge arm group The upper bridge arm of the second bridge arm group includes parallel V2 and D2
  • the lower bridge arm of the second bridge arm group includes parallel connection V5 and D5
  • the upper bridge arm of the third bridge arm group includes parallel connection V3 and D3
  • the lower bridge arm of the third bridge arm group includes parallel connection V3 and D3.
  • the bridge arm consists of V6 and D6 connected in parallel.
  • the negative poles of D1, D2, D3 and D7 are all connected to the positive pole of the power battery, and the positive poles of D4, D5, D6 and D8 are all connected to the negative pole of the power battery.
  • the charge and discharge circuit also includes a capacitor C1.
  • Capacitor C1 can eliminate interference.
  • a discharge circuit for discharging the power battery is formed through this charge and discharge circuit.
  • the current flow direction is: power battery positive electrode ⁇ V1, V2 and V3 ⁇ winding LA, winding LB and winding LC ⁇ V8 ⁇ Power battery negative pole.
  • V4, V5 and V6 are closed.
  • a charging circuit for charging the power battery is formed through this charge and discharge circuit.
  • the current flow direction is: power battery negative electrode ⁇ V4, V5 and V6 ⁇ winding LA, winding LB and winding LC ⁇ V7 ⁇ Power battery positive electrode.
  • V1, V2 and V3 are closed.
  • the first peak current is the known peak current of the charge-discharge switching bridge arm group
  • the second peak current is the known peak current of the neutral line.
  • the known peak current of the charge-discharge switching bridge arm group and the known peak current of the neutral line are both measured and calibrated in advance.
  • the control method of the embodiment of the present application regulates the size of the first current value according to the first current value in the neutral line, the known peak current of the charge-discharge switching bridge arm group, and the known peak current of the neutral line, so that it can When the current value is abnormal during the charging and discharging process of the power battery, the current should be adjusted in time to avoid damaging the circuit.
  • step S20 includes S201 and S202:
  • Each preset safety value may be preset according to actual needs, or may be set according to other parameter conditions, for example, may be set according to the request current value sent by the battery management system BMS.
  • each first preset value is less than or equal to the first peak current
  • each second preset value is less than or equal to the second peak current
  • all first preset values and all second preset values correspond one to one
  • each second preset value is less than or equal to the second peak current.
  • a preset value corresponds to a preset safety value. The first preset value and the second preset value corresponding to each other correspond to the same preset safety value.
  • the current size of charging and discharging can be controlled with higher accuracy.
  • the number of first preset values can be set according to actual needs, for example, it can be set to 3, 4, 5 or other positive integers.
  • the first peak current is expressed as I 1
  • the second peak current is expressed as I 2
  • the value I 1 *X 1 % corresponds to the second preset value I 2 *Y 1 %
  • the preset value I 1 *X 3 % corresponds to the second preset value I 2 *Y 3 %, where 0 ⁇ 2 % ⁇ Y 3 % ⁇ 100%.
  • step S201 includes steps S2011 to step S2013:
  • S2011 Determine a maximum first preset value smaller than the first current value from all first preset values, and determine a maximum second preset value smaller than the first current value from all second preset values.
  • first preset values a1, a2, a3,...an there are n sequentially increasing first preset values a1, a2, a3,...an, and n sequentially increasing second preset values b1, b2, b3,...bn.
  • S2012 Determine a first preset safety value corresponding to the maximum first preset value and a second preset safety value corresponding to the maximum second preset value.
  • a first preset safety value Sm corresponding to the maximum first preset value am and a second preset safety value Sp corresponding to the maximum second preset value bp are determined.
  • S2013 Determine the smaller value of the first preset safety value and the second preset safety value. If they are equal, use any one of them as the smaller value; the smaller value is the preset value corresponding to the first current value. Set a safe value. The charging and discharging current is adjusted to the determined smaller value. By determining the smaller of the first preset safety value and the second preset safety value as the preset safety value corresponding to the first current value, it can be ensured that the current value flowing through the neutral line is relative to the neutral line and the current value flowing through the neutral line.
  • the current value of the charge and discharge switching bridge arm group is safer than that of the charge and discharge switching bridge arm group. It can avoid overcurrent of the neutral line and the charge and discharge switching bridge arm group at the same time, ensuring higher current safety and avoiding overcurrent. current damages the circuit.
  • the method before the first current value in the neutral line is acquired in real time during the charging and discharging process of the power battery by the charging and discharging circuit, the method further includes:
  • each preset safety value is less than or equal to the requested current value. Limiting each preset safety value according to the requested current value sent by the battery management system can ensure that the setting of each preset safety value is more reasonable and improve the safety of charging and discharging.
  • the current state of the power battery may include, for example, the current state of charge SOC and current temperature.
  • the battery management system BMS calculates the requested current value I req based on the current state of the power battery, and sends I req to the control module.
  • X1 % 55%
  • X2 % 75%
  • X3 % 80%
  • Y1 % 70%
  • Y2 % 85%
  • Y3 % 90%
  • Z1 % 95%
  • Z2 % 85%
  • Z3 % 60%.
  • obtaining the first current value in the neutral line in real time includes: receiving the first current value detected in real time by the current detection module.
  • the first current value is detected in real time by the current detection module to obtain an accurate first current value.
  • the current detection module may be, for example, a current sensor, used to detect the first current value in the neutral line. As shown in Figure 6, the current sensor is connected in series between the neutral line and the upper and lower bridge arm connection points of the charge and discharge switching bridge arm group, detects the first current value, and sends the first current value to the control module.
  • the control module is provided with a wiring terminal for connecting the current sensor.
  • the interface terminal allows the current value of the current sensor to be quickly received by the control module, and the charge and discharge current is adjusted according to the currently collected current value, thereby protecting the charge and discharge circuit.
  • the control module may be, for example, a controller, a processor, etc.
  • obtaining the first current value in the neutral line in real time includes:
  • the current value of each winding is detected in real time through the current detection module, and the first current value is obtained by summing, which is more accurate.
  • the current detection module includes M current sensors.
  • the current sensor detects the current value of each winding of the motor in real time, and then calculates the sum of the current values in all windings to obtain the first current value.
  • Each current sensor is connected in series between the corresponding winding and the corresponding bridge arm group, and is used to detect the current value flowing through the corresponding winding.
  • the current detection module includes current sensor 1, current sensor 2 and current sensor 3.
  • Current sensor 1, current sensor 2, and current sensor 3 respectively detect the current value I1 of winding LA, the current value I2 of winding LB, and the current value I3 of winding LC.
  • the first current value I1+I2+I3.
  • the control module has three interface terminals. Each interface terminal is used to connect a current sensor.
  • the interface terminal allows the current value of the current sensor to be quickly received by the control module, and makes charging decisions based on the currently collected current value.
  • the discharge current is adjusted to protect the charge and discharge circuit.
  • the control module may be, for example, a controller, a processor, etc.
  • adjusting the first current value to the determined preset safety value includes:
  • regulating the current charge and discharge cycle includes: regulating the alternating formation frequency of the charging circuit and the discharging circuit.
  • Controlling the shortening of the charge and discharge cycle can be achieved by controlling and increasing the frequency of alternating formation of the charging circuit and the discharging circuit. Regulating the alternating frequency of the charging loop and the discharging loop can ensure higher control accuracy.
  • the conduction time of the charging circuit is T1
  • the conduction time of the discharge circuit is T2
  • the charge and discharge cycle T T1+T2.
  • Controlling the shortening of the charge and discharge cycle T can be achieved by shortening T1 and T2.
  • the charging process and the discharging process are balanced. During the discharging process of the power battery, all the electric energy stored in each winding and energy storage element is released and charged into the power battery during the charging process of the power battery.
  • the switching times of the switches V1 to V8 can be adjusted simultaneously, so that the on-time of the switches at a fixed frequency is reduced, thereby reducing the current in the inductor.
  • the duty cycle of V1 to V8 is reduced through the control signal.
  • the specific value of its regulation can be adjusted according to actual needs.
  • the duty cycle is proportional to the current value. Since the inductor alternately charges and discharges, it is necessary to ensure that V1 to V8 have the same duty cycle. Or by continuously adjusting the duty cycle, the equivalent duty cycles of the four switches V1, V2, V3 and V8 and the four switches V4, V5, V6 and V7 are the same over a period of time, thereby realizing charging and discharging. Evenly.
  • the duty cycle is adjusted to reduce the current, and the frequency of the switching tubes from V1 to V8 can also be increased to reduce the current.
  • the higher the frequency the smaller the current value, because the inductor needs to alternately charge and discharge so that V1 to V8 have The same frequency or by continuously adjusting the frequency so that the equivalent frequencies of the four switching tubes V1, V2, V3 and V8 and the four switching tubes V4, V5, V6 and V7 are the same over a period of time, thereby achieving charge and discharge. Evenly.
  • the four switches V1, V2, V3 and V8 need to be controlled at the same time.
  • the four switches V4, V5, V6 and V7 need to be controlled at the same time.
  • the four switches V1, V2, V3 and V8 and V4 The four switches of , V5, V6 and V7 can be controlled with different frequencies and duty cycles, as long as the equivalent frequency and duty cycle control are ensured to achieve uniform charging and discharging of the inductor.
  • the charging and discharging switching bridge arm group When charging and discharging, the charging and discharging switching bridge arm group needs to withstand the sum of the currents of the three bridge arm groups in the motor inverter module. Therefore, overcurrent is prone to occur and cause damage. Therefore, the control method in the embodiment of the present application can pass Regulating the size of the first current value has a good protective effect on the charge and discharge switching bridge arm group, and can also play a good protective role on the neutral line.
  • control device for a charge and discharge circuit.
  • the neutral line of the motor in the charge and discharge circuit is connected to the charge and discharge switching bridge arm group.
  • the control device includes:
  • the current value acquisition module is used to obtain the first current value in the neutral line in real time during the process of charging and discharging the power battery by the charging and discharging circuit;
  • the current control module is used to control the size of the first current value according to the first current value, the first peak current and the second peak current;
  • the first peak current is the known peak current of the charge-discharge switching bridge arm group
  • the second peak current is the known peak current of the neutral line.
  • the current regulation module includes:
  • a determination unit configured to determine a preset safety value corresponding to the first current value based on the magnitude relationship between the first current value and all first preset values and all second preset values;
  • a control unit used to control the charging and discharging current to a determined preset safe value
  • each first preset value is less than or equal to the first peak current
  • each second preset value is less than or equal to the second peak current
  • all first preset values and all second preset values correspond one to one
  • each second preset value is less than or equal to the second peak current.
  • a preset value corresponds to a preset safety value.
  • the determining unit includes:
  • the first determination subunit is used to determine the maximum first preset value that is less than the first current value from all the first preset values, and determine the maximum first preset value that is less than the first current value from all the second preset values. 2. Default value;
  • a second determination subunit configured to determine a first preset safety value corresponding to the maximum first preset value and a second preset safety value corresponding to the maximum second preset value
  • the third determination subunit is used to determine the smaller value of the first preset safety value and the second preset safety value. If the two are equal, then any one of the values is used as the smaller value; the smaller value is the corresponding The default safety value at the first current value.
  • control device further includes: a receiving module, configured to receive the battery management system's information based on the power before acquiring the first current value in the neutral line in real time during the charging and discharging process of the power battery by the charging and discharging circuit.
  • the requested current value obtained and sent by the current status of the battery; each preset safety value is less than or equal to the requested current value.
  • the step of obtaining the first current value in the neutral line in real time performed by the current value acquisition module includes: receiving the first current value detected in real time by the current detection module.
  • the step of obtaining the first current value in the neutral line in real time, performed by the current value acquisition module includes:
  • control unit adjusts the first current value to the determined preset safety value, including:
  • Regulating the current charge and discharge cycle includes: regulating the alternating formation frequency of the charging circuit and the discharging circuit.
  • the control device in the embodiment of the present application can implement the control method of the charge and discharge circuit in any of the above embodiments, and can be based on the first current value in the neutral line, the known peak current of the charge and discharge switching bridge arm group and the neutral line
  • the known peak current controls the size of the first current value, so that when an abnormal current value occurs during the charging and discharging process of the power battery, the current can be adjusted in time to avoid damaging the circuit.
  • Another embodiment of the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor.
  • the processor executes the program to implement any of the above embodiments. Control method of discharge circuit.
  • the electronic device 10 may include: a processor 100, a memory 101, a bus 102 and a communication interface 103.
  • the processor 100, the communication interface 103 and the memory 101 are connected through the bus 102; memory 101 stores a computer program that can be run on the processor 100.
  • the processor 100 runs the computer program, it executes the method provided by any of the foregoing embodiments of this application.
  • the memory 101 may include high-speed random access memory (RAM: Random Access Memory), or may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
  • RAM Random Access Memory
  • non-volatile memory such as at least one disk memory.
  • the communication connection between the system network element and at least one other network element is realized through at least one communication interface 103 (which can be wired or wireless), and the Internet, wide area network, local network, metropolitan area network, etc. can be used.
  • the bus 102 may be an ISA bus, a PCI bus, an EISA bus, etc.
  • the bus can be divided into address bus, data bus, control bus, etc.
  • the memory 101 is used to store a program, and the processor 100 executes the program after receiving the execution instruction.
  • the method disclosed in any of the embodiments of the present application can be applied to the processor 100 or implemented by the processor 100 .
  • the processor 100 may be an integrated circuit chip with signal processing capabilities. During the implementation process, each step of the above method can be completed by instructions in the form of hardware integrated logic circuits or software in the processor 100 .
  • the above-mentioned processor 100 can be a general-purpose processor, which can include a central processing unit (Central Processing Unit, CPU for short), a network processor (Network Processor, NP for short), etc.; it can also be a digital signal processor (DSP), a dedicated integrated processor Circuits (ASICs), off-the-shelf programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.
  • DSP digital signal processor
  • ASICs dedicated integrated processor Circuits
  • FPGAs off-the-shelf programmable gate arrays
  • Each method, step and logical block diagram disclosed in the embodiment of this application can be implemented or executed.
  • a general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.
  • the steps of the method disclosed in conjunction with the embodiments of the present application can be directly implemented by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other mature storage media in this field.
  • the storage medium is located in the memory 101.
  • the processor 100 reads the information in the memory 101 and completes the steps of the above method in combination with its hardware.
  • the electronic device provided by the embodiments of the present application and the method provided by the embodiments of the present application are based on the same inventive concept, and have the same beneficial effects as the methods adopted, run or implemented.
  • Another embodiment of the present application provides a control system for a charge and discharge circuit, including a control module and a charge and discharge circuit connected to each other.
  • the neutral line of the motor in the charge and discharge circuit is connected to the charge and discharge switching bridge arm group; the control module is To execute the control method of the charge and discharge circuit in any of the above embodiments.
  • the charging and discharging circuit may be, for example, the charging and discharging circuit used in any of the above embodiments.
  • the charge-discharge switching bridge arm group includes an upper bridge arm and a lower bridge arm connected in series, and the connection point of the upper bridge arm and the lower bridge arm is connected to the neutral line.
  • the upper bridge arm includes a first switch and a first diode connected in parallel
  • the lower bridge arm includes a second switch and a second diode connected in parallel
  • the cathode of the first diode is connected to the anode of the power battery.
  • the anode of the first diode is connected to the cathode of the second diode, and the anode of the second diode is connected to the cathode of the power battery.
  • the motor is an M-phase motor;
  • the charge and discharge circuit also includes an M-phase bridge arm circuit, M is a positive integer;
  • each phase bridge arm circuit includes an upper bridge arm and a lower bridge arm connected in series;
  • the M-phase bridge arm circuit The M upper and lower bridge arm connection points are connected to the M-phase motor windings in a one-to-one correspondence.
  • the charge and discharge circuit further includes a current detection module, and the current detection module is connected in series between the neutral line and the charge and discharge switching bridge arm group.
  • the charge and discharge circuit further includes a capacitor connected in parallel with the power battery. Capacitors can eliminate interference.
  • the control system provided by the embodiment of the present application can implement the control method of the charge and discharge circuit in any of the above embodiments, and can be based on the first current value in the neutral line, the known peak current of the charge and discharge switching bridge arm group and The known peak current of the neutral line regulates the size of the first current value, so that when an abnormal current value occurs during the charging and discharging process of the power battery, the current can be adjusted in time to avoid damaging the circuit.
  • Another embodiment of the present application provides a computer-readable storage medium on which a computer program is stored, and the program is executed by a processor to implement the control method of the charge and discharge circuit in any of the above embodiments.
  • the computer-readable storage medium shown is an optical disk 20, on which a computer program (i.e., a program product) is stored.
  • a computer program i.e., a program product
  • the computer program When the computer program is run by a processor, it will execute any of the foregoing embodiments. method.
  • examples of computer-readable storage media may also include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), and other types of random access memory.
  • PRAM phase change memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • RAM random access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable read-only memory
  • flash memory or other optical and magnetic storage media will not be described in detail here.
  • the computer-readable storage medium provided by the above embodiments of the present application is based on the same inventive concept as the method provided by the embodiments of the present application, and has the same beneficial effects as the methods adopted, run or implemented by the application programs stored therein.
  • module is not intended to be limited to a particular physical form. Depending on the specific application, modules may be implemented as hardware, firmware, software, and/or a combination thereof. Furthermore, different modules can share common components or even be implemented by the same components. There may or may not be clear boundaries between different modules.

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Abstract

本申请公开了一种充放电电路的控制方法、装置、设备、系统及存储介质。充放电电路中电机的中性线与充放电切换桥臂组连接，所述方法包括：在充放电电路对动力电池进行充放电的过程中，实时获取中性线中的第一电流值；根据第一电流值、第一峰值电流和第二峰值电流，调控第一电流值的大小；其中，第一峰值电流为充放电切换桥臂组的已知峰值电流，第二峰值电流为中性线的已知峰值电流。本申请的充放电电路的控制方法，根据中性线中的第一电流值、充放电切换桥臂组的已知峰值电流和中性线的已知峰值电流调控第一电流值的大小，从而能够在动力电池充放电过程中发生电流值异常时及时对电流进行调整，避免损坏电路。

Description

充放电电路的控制方法、装置、设备、系统及存储介质 技术领域
本申请涉及电池技术领域，具体涉及一种充放电电路的控制方法、装置、设备、系统及存储介质。
背景技术
随着科技的发展，动力电池已经越来越普及地应用于多个领域，尤其是应用于电动交通工具例如电动车辆等。动力电池具有高能量密度和环保效果好等优点。然而，在低温状态下动力电池的充放电功率和容量都有很大程度的衰减，因此，通常需要对动力电池进行充放电以实现动力电池自加热。现有技术缺乏应对动力电池充放电电流值异常的调控方案，在动力电池充放电过程中发生电流值异常时无法及时对电流进行调整，导致容易损坏电路。
发明内容
鉴于上述问题，本申请提供一种充放电电路的控制方法、装置、设备、系统及存储介质，能够解决现有技术中的在动力电池充放电过程中发生电流值异常时无法及时对电流进行调整，导致容易损坏电路的问题。为了对披露的实施例的一些方面有一个基本的理解，下面给出了简单的概括。该概括部分不是泛泛评述，也不是要确定关键/重要组成元素或描绘这些实施例的保护范围。其唯一目的是用简单的形式呈现一些概念，以此作为后面的详细说明的序言。
本申请实施例的第一方面，提供一种充放电电路的控制方法，所述充放电电路中电机的中性线与充放电切换桥臂组连接，所述方法包括：
在所述充放电电路对动力电池进行充放电的过程中，实时获取所述中性线中的第一电流值；
根据所述第一电流值、第一峰值电流和第二峰值电流，调控所述第一电流值的大小；
其中，所述第一峰值电流为所述充放电切换桥臂组的已知峰值电流，所述第二峰值电流为所述中性线的已知峰值电流。
本申请实施例的控制方法，根据中性线中的第一电流值、充放电切换桥臂 组的已知峰值电流和中性线的已知峰值电流调控第一电流值的大小，从而能够在动力电池充放电过程中发生电流值异常时及时对电流进行调整，避免损坏电路。
在一些实施例中，所述根据所述第一电流值、第一峰值电流和第二峰值电流，调控所述第一电流值的大小，包括：
根据所述第一电流值与所有第一预设值以及所有第二预设值之间的大小关系，确定对应于所述第一电流值的预设安全值；
将所述充放电的电流大小调控至所确定的预设安全值；
其中，各所述第一预设值小于或等于所述第一峰值电流，各所述第二预设值小于或等于所述第二峰值电流；所述所有第一预设值和所述所有第二预设值一一对应；每一所述第一预设值对应设置有一个预设安全值。
通过设定第一预设值和第二预设值以及对应的预设安全值，确定对应于第一电流值的预设安全值，对充放电的电流大小的调控精确度更高。
在一些实施例中，所述根据所述第一电流值与所有第一预设值以及所有第二预设值之间的大小关系，确定对应于所述第一电流值的预设安全值，包括：
从所有第一预设值中确定出小于所述第一电流值的最大第一预设值，以及从所有第二预设值中确定出小于所述第一电流值的最大第二预设值；
确定对应于所述最大第一预设值的第一预设安全值以及对应于所述最大第二预设值的第二预设安全值；
确定所述第一预设安全值和所述第二预设安全值中的较小值，若二者相等，则以其中任一值作为所述较小值；所述较小值为所述对应于所述第一电流值的预设安全值。通过确定第一预设安全值和第二预设安全值中的较小值作为对应于第一电流值的预设安全值，可以确保更高的电流安全度，避免过流损坏电路。
在一些实施例中，所述在所述充放电电路对动力电池进行充放电的过程中，实时获取所述中性线中的第一电流值之前，所述方法还包括：
接收电池管理系统根据动力电池当前状态所获取并发送的请求电流值；各所述预设安全值均小于或等于所述请求电流值。根据电池管理系统所发送的请求电流值限定各预设安全值，可以确保各预设安全值的设定更加合理，提高充放电的安全程度。
在一些实施例中，所述实时获取所述中性线中的第一电流值，包括：接收通过电流检测模块实时检测到的第一电流值。通过电流检测模块实时检测第一电流值，获得准确的第一电流值。
在一些实施例中，所述实时获取所述中性线中的第一电流值，包括：
接收通过电流检测模块实时检测到的所述电机中每一绕组的电流值；
计算所有所述绕组的电流值之和，得到所述第一电流值。通过电流检测模块实时检测每一绕组的电流值，求和获得第一电流值，较为准确。
在一些实施例中，所述将所述第一电流值调整至所确定的预设安全值，包括：
根据所述预设安全值与充放电周期之间的对应关系，确定对应于所述所确定的预设安全值的充放电周期值；
调控当前充放电周期至所确定的充放电周期值。调控当前充放电周期至所确定的充放电周期值，能够确保更高的调控准确度。
在一些实施例中，所述调控当前充放电周期包括：调控充电回路和放电回路的交替形成频率。调控充电回路和放电回路的交替形成频率，能够确保更高的调控准确度。
本申请实施例的第二方面，提供一种充放电电路的控制装置，所述充放电电路中电机的中性线与充放电切换桥臂组连接，所述装置包括：
电流值获取模块，用于在所述充放电电路对动力电池进行充放电的过程中，实时获取所述中性线中的第一电流值；
电流调控模块，用于根据所述第一电流值、第一峰值电流和第二峰值电流，调控所述第一电流值的大小；
其中，所述第一峰值电流为所述充放电切换桥臂组的已知峰值电流，所述第二峰值电流为所述中性线的已知峰值电流。
第二方面的控制装置能够实现第一方面的控制方法，根据中性线中的第一电流值、充放电切换桥臂组的已知峰值电流和中性线的已知峰值电流调控第一电流值的大小，从而能够在动力电池充放电过程中发生电流值异常时及时对电流进行调整，避免损坏电路。
本申请实施例的第三方面，提供一种电子设备，包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述处理器执行所述程序，以实现第一方面的充放电电路的控制方法。
第三方面的电子设备能够实现第一方面的控制方法，根据中性线中的第一电流值、充放电切换桥臂组的已知峰值电流和中性线的已知峰值电流调控第一电流值的大小，从而能够在动力电池充放电过程中发生电流值异常时及时对电流进行调整，避免损坏电路。
本申请实施例的第四方面，提供一种充放电电路的控制系统，包括互相连接的控制模块和充放电电路，所述充放电电路中电机的中性线与充放电切换桥臂组连接；所述控制模块用于执行第一方面的充放电电路的控制方法。
第四方面的控制系统能够实现第一方面的控制方法，根据中性线中的第一电流值、充放电切换桥臂组的已知峰值电流和中性线的已知峰值电流调控第一电流值的大小，从而能够在动力电池充放电过程中发生电流值异常时及时对电流进行调整，避免损坏电路。
在一些实施例中，所述充放电切换桥臂组包括串联的上桥臂和下桥臂，所述上桥臂和所述下桥臂的连接点与所述中性线相连接。
在一些实施例中，所述上桥臂包括并联的第一开关和第一二极管，所述下桥臂包括并联的第二开关和第二二极管；
所述第一二极管的负极与所述动力电池的正极相连接，所述第一二极管的正极与所述第二二极管的负极相连接，所述第二二极管的正极与所述动力电池的负极相连接。
在一些实施例中，所述电机为M相电机；所述充放电电路还包括M相桥臂电路，每一相桥臂电路包括串联的上桥臂和下桥臂；所述M相桥臂电路的M个上下桥臂连接点与所述M相电机绕组一一对应连接。
在一些实施例中，所述充放电电路还包括电流检测模块，所述电流检测模块串联在所述中性线与所述充放电切换桥臂组之间。
在一些实施例中，所述充放电电路还包括与所述动力电池并联的电容。
本申请实施例的第五方面，提供一种计算机可读存储介质，其上存储有计算机程序，该程序被处理器执行，以实现第一方面所述的充放电电路的控制方法。
第五方面的计算机可读存储介质能够实现第一方面的控制方法，根据中性线中的第一电流值、充放电切换桥臂组的已知峰值电流和中性线的已知峰值电流调控第一电流值的大小，从而能够在动力电池充放电过程中发生电流值异常时及时对电流进行调整，避免损坏电路。
本申请实施例的其中一个方面提供的技术方案可以包括以下有益效果：
本申请实施例提供的充放电电路的控制方法，根据中性线中的第一电流值、充放电切换桥臂组的已知峰值电流和中性线的已知峰值电流调控第一电流值的大小，从而能够在动力电池充放电过程中发生电流值异常时及时对电流进行调整，避免损坏电路。
本申请的其他特征和优点将在随后的说明书中阐述，并且，部分地从说明书中变得显而易见，或者，部分特征和优点可以从说明书中推知或毫无疑义地确定，或者通过实施本申请实施例了解。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请中记载的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1示出了本申请一些实施方式的充放电电路的控制方法流程图；
图2示出了本申请一些实施方式的放电回路示意图；
图3示出了本申请一些实施方式的充电回路示意图；
图4示出了图1中步骤S20的流程图；
图5示出了图4中步骤S201的流程图；
图6示出了本申请一些实施方式的充放电电路、动力电池和控制模块的连接结构示意图；
图7示出了本申请一些实施方式的充放电电路、动力电池和控制模块的连接结构示意图；
图8示出了本申请一些实施方式的充放电电路的控制装置的结构框图；
图9示出了本申请一些实施方式的电子设备的结构框图；
图10示出了本申请一些实施方式的计算机可读存储介质的示意图。
本申请的目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
下面将结合附图对本申请技术方案的实施例进行详细的描述。以下实施例仅用于更加清楚地说明本申请的技术方案，因此只作为示例，而不能以此来限制本申请的保护范围。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本文中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。
在本申请实施例的描述中，技术术语“第一”“第二”等仅用于区别不同对象，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量、特定顺序或主次关系。在本申请实施例的描述中，“多个”的含义是两个以上，除非另有明确具体的限定。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一 定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
在本申请实施例的描述中，术语“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如A和/或B，可以表示：存在A，同时存在A和B，存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请实施例的描述中，术语“多个”指的是两个以上(包括两个)，同理，“多组”指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。
在本申请实施例的描述中，技术术语“中心”“纵向”“横向”“长度”“宽度”“厚度”“上”“下”“前”“后”“左”“右”“竖直”“水平”“顶”“底”“内”“外”“顺时针”“逆时针”“轴向”“径向”“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请实施例和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请实施例的限制。
在本申请实施例的描述中，除非另有明确的规定和限定，技术术语“安装”“相连”“连接”“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；也可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请实施例中的具体含义。
动力电池具有高功率、高能量密度、环保效果好等优点，已经被广泛应用于新能源车辆、消费电子、储能系统等技术领域中。动力电池能够但不限用于车辆、船舶或飞行器等用电装置中。
以电动车辆为例，以动力电池提供动力的电动车辆具有环保效果好、噪音小、成本低、能够有效促进节能减排等优点，具有巨大的市场应用前景，有利于经济的可持续发展。由于动力电池的电化学特性，在温度较低时，动力电池的性能被大大限制，严重影响在低温环境中使用。因此，为了能够正常使用动力电池，需要在低温环境中对动力电池进行加热。发明人发现，现有技术中对动力电池进行加热时，缺少对充放电过程中的电流异常状况例如电流过大等状况的处理方案，在动力电池充放电过程中发生电流值异常时无法及时对电流进行调整，导致容易损坏电路，以及容易产生由电流异常状况所导致的安全隐患，导致充放电安全性较低。例如，在充放电过程中如果电流值过大，超过安全阈值，则可能导致电路损坏等问题，严重时甚至引发电路起火等安全事故，因此亟待解决现有技术中存在的这些问题。
针对上述问题，本申请实施例提供了一种充放电电路的控制方法，根据中性线中的第一电流值、充放电切换桥臂组的已知峰值电流和中性线的已知峰值电流调控第一电流值的大小，从而能够在动力电池充放电过程中发生电流值异常时及时对电流进行调整，避免损坏电路。
如图1所示，本申请的一个实施例提供了一种充放电电路的控制方法，充放电电路中电机的中性线与充放电切换桥臂组连接，充放电电路的控制方法的执行主体可以为控制模块。控制模块例如可以是控制器、处理器等。
在一些实施方式中，该控制方法包括步骤S10至步骤S20：
S10、在充放电电路对动力电池进行充放电的过程中，实时获取中性线中的第一电流值。
充放电电路可以包括M相电机绕组以及电机逆变器模块的M个桥臂组。M为正整数。充放电电路还可以包括与电池并联的电容。每一绕组与对应桥臂组的上下桥臂连接点相连接。M例如可以为3，也可以为其他正整数。本实施例中以M为3为例，即三相电机绕组。中性线中的第一电流值即充放电回路的充放电电流值。
M相电机绕组的中性线和充放电切换桥臂组的上下桥臂连接点依次连接。
电机逆变器模块的M个桥臂组，每一桥臂组包括串联的上桥臂和下桥臂，每一桥臂组的上下桥臂连接点与M相电机绕组中的对应绕组相连接。
该充放电电路还可以包括至少一个储能元件，该至少一个储能元件串联在第一电流检测单元与M相电机绕组的中性线之间。储能元件例如可以是电感或电容等。
充放电切换桥臂组的上桥臂和下桥臂，用于在充放电使能信号的触发下导通或截止。
上桥臂包括第一开关，下桥臂包括第二开关；或者，上桥臂包括并联的第一开关和第一二极管，下桥臂包括并联的第二开关和第二二极管；
第一二极管的负极与动力电池的正极相连接，第一二极管的正极与第二二极管的负极相连接，第二二极管的正极与动力电池的负极相连接。动力电池包括至少一个电池组。
参考图2和图3所示的电路图，V1、V2、……V8作为开关，可以采用IGBT管等能够起到开关作用的元件；D1、D2、……D8均可以采用二极管。充放电切换桥臂组的上桥臂为并联的V7和D7，充放电切换桥臂组的下桥臂为并联的V8和D8。
电机逆变器模块的三个桥臂组中，第一桥臂组的上桥臂包括并联的V1和D1，第一桥臂组的下桥臂包括并联的V4和D4；第二桥臂组的上桥臂包括并联的V2和D2，第二桥臂组的下桥臂包括并联的V5和D5；第三桥臂组的上桥臂包括并联的V3和D3，第三桥臂组的下桥臂包括并联的V6和D6。
D1、D2、D3和D7的负极均连接到动力电池的正极，D4、D5、D6和D8的正极均连接到动力电池的负极。
如图2和图3所示，该充放电电路还包括电容C1。电容C1能够起到消除干扰的作用。
如图2所示，通过该充放电电路形成的一个用于对动力电池进行放电的放电回路，其电流流向为：动力电池正极→V1、V2和V3→绕组LA、绕组LB和绕组LC→V8→动力电池负极。在对动力电池进行放电的放电回路中，V4、V5和V6是关闭的。
如图3所示，通过该充放电电路形成的一个用于对动力电池进行充电的充电回路，其电流流向为：动力电池负极→V4、V5和V6→绕组LA、绕组LB和绕组LC→V7→动力电池正极。在充电回路中，V1、V2和V3是关闭的。
S20、根据第一电流值、第一峰值电流和第二峰值电流，调控第一电流值的大小。
其中，第一峰值电流为充放电切换桥臂组的已知峰值电流，第二峰值电流为中性线的已知峰值电流。充放电切换桥臂组的已知峰值电流和中性线的已知峰值电流均为预先测量标定的。
本申请实施例的控制方法，根据中性线中的第一电流值、充放电切换桥臂组的已知峰值电流和中性线的已知峰值电流调控第一电流值的大小，从而能够在动力电池充放电过程中发生电流值异常时及时对电流进行调整，避免损坏电路。
如图4所示，在一些实施方式中，步骤S20包括S201和S202：
S201、根据第一电流值与所有第一预设值以及所有第二预设值之间的大小关系，确定对应于第一电流值的预设安全值。
各预设安全值可以是根据实际需要预先设定的，也可以是根据其他参数条件设定的，例如可以是根据电池管理系统BMS所发送的请求电流值设定的。
S202、将充放电的电流大小调控至所确定的预设安全值。
其中，各第一预设值小于或等于第一峰值电流，各第二预设值小于或等于第二峰值电流；所有第一预设值和所有第二预设值一一对应；每一第一预设值对应设置有一个预设安全值。互相对应的第一预设值和第二预设值对应于同一预设安全值。
通过设定第一预设值和第二预设值以及对应的预设安全值，确定对应于第一电流值的预设安全值，对充放电的电流大小的调控精确度更高。第一预设值的数目可以根据实际需要进行设定，例如可以设置为3个、4个、5个或者其他正整数个。
在一个具体示例中，第一峰值电流表示为I1，第二峰值电流表示为I2，设置有一一对应的3个第一预设值和3个第二预设值，第一预设值I1*X1％与第二预设值I2*Y1％相对应，第一预设值I1*X2％与第二预设值I2*Y2％相对应，第一预设值I1*X3％与第二预设值I2*Y3％相对应，其中，0≤X1％＜X2％＜X3％≤100％，0≤Y1％＜Y2％＜Y3％≤100％。
例如，X1％＝50％，X2％＝70％，X3％＝90％，Y1％＝65％，Y2％＝80％，Y3％＝95％；或者，X1％＝55％，X2％＝75％，X3％＝80％，Y1％＝70％，Y2％＝85％，Y3％＝90％；或者，X1％＝60％，X2％＝80％，X3％＝90％，Y1％＝50％，Y2％＝75％，Y3％＝85％；或者其他值，具体可以根据实际需要进行设定。
如图5所示，在一些实施方式中，步骤S201包括步骤S2011至步骤S2013：
S2011、从所有第一预设值中确定出小于第一电流值的最大第一预设值，以及从所有第二预设值中确定出小于第一电流值的最大第二预设值。
例如，假设共有n个依次增大的第一预设值a1、a2、a3、……an，以及n个依次增大的第二预设值b1、b2、b3、……bn。将第一电流值与a1、a2、a3、……an进行比较，得到a1＜a2＜a3＜……＜am＜第一电流值＜ad，其中d＝m+1，则确定最大第一预设值为am。将第二电流值与b1、b2、b3、……bn进行比较，得到b1＜b2＜b3＜……＜bp＜第一电流值＜bq，其中q＝p+1，则确定最大第二预设值为bp。
S2012、确定对应于最大第一预设值的第一预设安全值以及对应于最大第二预设值的第二预设安全值。
确定对应于最大第一预设值am的第一预设安全值Sm，对应于最大第二预设值bp的第二预设安全值Sp。
S2013、确定第一预设安全值和第二预设安全值中的较小值，若二者相等，则以其中任一值作为较小值；较小值为对应于第一电流值的预设安全值。将充放电的电流大小调控至所确定的该较小值。通过确定第一预设安全值和第二预设安全值中的较小值作为对应于第一电流值的预设安全值，能够确保流经中性线的电流值相对于中性线以及流经充放电切换桥臂组的电流值相对于充放电切换桥臂组均是安全的，可以同时避免中性线和充放电切换桥臂组过流，可以确保更高的电流安全度，避免过流损坏电路。
比较第一预设安全值Sm和第二预设安全值Sp的大小，确定较小的一个作为较小值，例如，若Sm＞Sp，则确定Sp为较小值，若Sm＜Sp，则确定Sm为较小值；若Sm＝Sp，则确定Sm或Sp为较小值。
例如，在前述的具体示例中，可以设置：
当It3＞I1*X3％(即最大第一预设值为I1*X3％)或It3＞I2*Y3％(即最大第二预设值为I2*Y3％)时，对应的预设安全值为It33，将当前的It3调整至与I1*X3％和I2*Y3％相对应的预设安全值It33；
当I1*X3％≥It3＞I1*X2％(即最大第一预设值为I1*X2％)或I2*Y3％≥It3＞I2*Y2％(即最大第二预设值为I2*Y2％)时，对应的预设安全值It32，将当前的It3调整至与X2％和Y2％相对应的预设安全值It32；
当I1*X2％≥It3＞I1*X1％(即最大第一预设值为I1*X1％)或I2*Y2％≥It3＞I2*Y1％(即最大第一预设值为I2*Y1％)时，对应的预设安全值It31，将当前的It3调整至与X1％和Y1％相对应的预设安全值It31。
在一些实施方式中，在充放电电路对动力电池进行充放电的过程中，实时获取中性线中的第一电流值之前，该方法还包括：
S00、接收电池管理系统根据动力电池当前状态所获取并发送的请求电流值；各预设安全值均小于或等于请求电流值。根据电池管理系统所发送的请求电流值限定各预设安全值，可以确保各预设安全值的设定更加合理，提高充放电的安全程度。
动力电池的当前状态例如可以包括当前荷电状态SOC和当前温度等，电池管理系统BMS根据动力电池的当前状态计算得到请求电流值Ireq，并将Ireq发送到控制模块。
各预设安全值例如可以是It31＝Ireq*Z1％、It32＝Ireq*Z2％和It33＝Ireq*Z3％，其中，100％≥Z1％＞Z2％＞Z3％≥0。例如，Z1％＝90％，Z2％＝80％，Z3％＝50％；或者，Z1％＝95％，Z2％＝85％，Z3％＝60％；或者，Z1％＝85％，Z2％＝80％，Z3％＝65％；或者还可以根据实际需要设定其他值。
例如，当I1*X2％≥It3＞I1*X1％或I2*Y2％≥It3＞I2*Y1％时，It31＝Ireq*Z1％；
当I1*X3％≥It3＞I1*X2％或I2*Y3％≥It3＞I2*Y2％时，It32＝Ireq*Z2％；
当It3＞I1*X3％或It3＞I2*Y3％时，It33＝Ireq*Z3％。
在一个具体示例中，X1％＝55％，X2％＝75％，X3％＝80％，Y1％＝70％，Y2％＝85％，Y3％＝90％，Z1％＝95％，Z2％＝85％，Z3％＝60％。
在一些实施方式中，实时获取中性线中的第一电流值，包括：接收通过电流检测模块实时检测到的第一电流值。通过电流检测模块实时检测第一电流值，获得准确的第一电流值。电流检测模块例如可以为电流传感器，用于检测中性线中的第一电流值。如图6所示，电流传感器串联在中性线与充放电切换桥臂组的上下桥臂连接点之间，检测得到第一电流值，将第一电流值发送给控制模块。控制模块上设置有一个接线端子，用于连接电流传感器，接口端子使得电流传感器的电流值能够被控制模块快速接收，并根据当前采集的电流值做出充放电电流调节，从而保护充放电电路。控制模块例如可以为控制器、处理器等。
在一些实施方式中，实时获取中性线中的第一电流值，包括：
接收通过电流检测模块实时检测到的电机中每一绕组的电流值；
计算所有绕组的电流值之和，得到第一电流值。通过电流检测模块实时检测每一绕组的电流值，求和获得第一电流值，较为准确。
例如，对于一个M相电机，电流检测模块包括M个电流传感器，通过电流传感器实时检测电机每一绕组的电流值，然后计算所有绕组中的电流值的和，得到第一电流值。每一电流传感器串联在对应的绕组以及对应的桥臂组之间，用于检测流经对应绕组的电流值。
如图7所示，电流检测模块包括电流传感器1、电流传感器2和电流传感器3。电流传感器1、电流传感器2、电流传感器3分别检测绕组LA的电流值I1、绕组LB的电流值I2、绕组LC的电流值I3。第一电流值＝I1+I2+I3。
如图7所示，控制模块具有三个接口端子，每一接口端子用于连接一个电流传感器，接口端子使得电流传感器的电流值能够被控制模块快速接收，并根据当前采集的电流值做出充放电电流调节，从而保护充放电电路。控制模块例如可以为控制器、处理器等。
在一些实施方式中，将第一电流值调整至所确定的预设安全值，包括：
根据预设安全值与充放电周期之间的对应关系，确定对应于所确定的预设安全值的充放电周期值；
调控当前充放电周期至所确定的充放电周期值。调控当前充放电周期至所确定的充放电周期值，能够确保更高的调控准确度。
在一些实施方式中，调控当前充放电周期包括：调控充电回路和放电回路的交替形成频率。
控制缩短充放电周期可以通过控制提高充电回路和放电回路的交替形成频率来实现。调控充电回路和放电回路的交替形成频率，能够确保更高的调控准确度。例如，充电回路的导通时间为T1，放电回路的导通时间为T2，充放电周期T＝T1+T2。控制缩短充放电周期T可以通过缩短T1和T2来实现。充电过程与放电过程是均衡的，动力电池在放电过程中存储到各绕组以及储能元件中的电能在对动力电池充电过程中全部释放充入动力电池中。
在一个具体示例中，可以同时调控开关V1至V8的开关时间，使得开关在固定频率下的导通时间减少，从而使电感的电流减小。通过控制信号减少V1至V8的占空比，其调控的具体值可根据实际需求进行调控，占空比与电流值成正比，由于电感交替充放电需要确保V1至V8具有相同的占空比，或者通过不断地调控占空比，使得在一段时间下的V1、V2、V3和V8这4个开关以及V4、V5、V6和V7这4个开关的等效占空比相同，从而实现充放电均匀。
在一个具体示例中，采用调控占空比减少电流，还可以采用提升V1至V8的开关管频率来降低电流，频率越高其电流值越小，由于电感需要交替充放电以使V1至V8具有相同的频率或者通过不断地调控频率使得在一段时间下的V1、V2、V3和V8这4个开关管以及V4、V5、V6和V7这4个开关管的等效频率相同，从而实现充放电均匀。
在这两个示例中，V1、V2、V3和V8这4个开关需要同时调控，V4、V5、V6和V7这4个开关需要同时调控，V1、V2、V3、V8这4个开关以及V4、V5、V6和V7这4个开关之间可以采用不同的频率和占空比进行调控，只要确保其等效的频率和占空比调控使得电感实现充放电均匀即可。
在进行充放电时，充放电切换桥臂组需要承受电机逆变器模块中的三个桥臂组的电流总和，因此容易发生电流过流而导致损坏，因此本申请实施例的控制方法能够通过调控第一电流值的大小，对充放电切换桥臂组起到很好的保护作用，而且也能够对中性线起到很好的保护作用。
本申请的另一个实施例提供了一种充放电电路的控制装置，充放电电路中电机的中性线与充放电切换桥臂组连接，如图8所示，该控制装置包括：
电流值获取模块，用于在充放电电路对动力电池进行充放电的过程中，实时获取中性线中的第一电流值；
电流调控模块，用于根据第一电流值、第一峰值电流和第二峰值电流，调控第一电流值的大小；
其中，第一峰值电流为充放电切换桥臂组的已知峰值电流，第二峰值电流为中性线的已知峰值电流。
在一些实施方式中，电流调控模块包括：
确定单元，用于根据第一电流值与所有第一预设值以及所有第二预设值之间的大小关系，确定对应于第一电流值的预设安全值；
调控单元，用于将充放电的电流大小调控至所确定的预设安全值；
其中，各第一预设值小于或等于第一峰值电流，各第二预设值小于或等于第二峰值电流；所有第一预设值和所有第二预设值一一对应；每一第一预设值对应设置有一个预设安全值。
在一些实施方式中，确定单元包括：
第一确定子单元，用于从所有第一预设值中确定出小于第一电流值的最大第一预设值，以及从所有第二预设值中确定出小于第一电流值的最大第二预设值；
第二确定子单元，用于确定对应于最大第一预设值的第一预设安全值以及对应于最大第二预设值的第二预设安全值；
第三确定子单元，用于确定第一预设安全值和第二预设安全值中的较小值，若二者相等，则以其中任一值作为较小值；该较小值为对应于第一电流值的预设安全值。
在一些实施方式中，本控制装置还包括：接收模块，用于在充放电电路对动力电池进行充放电的过程中，实时获取中性线中的第一电流值之前，接收电池管理系统根据动力电池当前状态所获取并发送的请求电流值；各预设安全值均小于或等于请求电流值。
在一些实施方式中，电流值获取模块所执行的实时获取中性线中的第一电流值的步骤，包括：接收通过电流检测模块实时检测到的第一电流值。
在一些实施方式中，电流值获取模块所执行的实时获取中性线中的第一电流值的步骤，包括：
接收通过电流检测模块实时检测到的电机中每一绕组的电流值；
计算所有绕组的电流值之和，得到第一电流值。
在一些实施方式中，调控单元将第一电流值调整至所确定的预设安全值，包括：
根据预设安全值与充放电周期之间的对应关系，确定对应于所确定的预设安全值的充放电周期值；
调控当前充放电周期至所确定的充放电周期值。
调控当前充放电周期包括：调控充电回路和放电回路的交替形成频率。
本申请实施例的控制装置，能够实现上述任一实施方式的充放电电路的控制方法，能够根据中性线中的第一电流值、充放电切换桥臂组的已知峰值电流和中性线的已知峰值电流调控第一电流值的大小，从而能够在动力电池充放电过程中发生电流值异常时及时对电流进行调整，避免损坏电路。
本申请的另一个实施例提供了一种电子设备，包括存储器、处理器及存储在存储器上并可在处理器上运行的计算机程序，处理器执行该程序，以实现上述任一实施方式的充放电电路的控制方法。
如图9所示，电子设备10可以包括：处理器100，存储器101，总线102和通信接口103，处理器100、通信接口103和存储器101通过总线102连接；存储器 101中存储有可在处理器100上运行的计算机程序，处理器100运行该计算机程序时执行本申请前述任一实施方式所提供的方法。
其中，存储器101可能包含高速随机存取存储器(RAM：Random Access Memory)，也可能还可以包括非不稳定的存储器(non-volatile memory)，例如至少一个磁盘存储器。通过至少一个通信接口103(可以是有线或者无线)实现该系统网元与至少一个其他网元之间的通信连接，可以使用互联网、广域网、本地网、城域网等。
总线102可以是ISA总线、PCI总线或EISA总线等。总线可以分为地址总线、数据总线、控制总线等。其中，存储器101用于存储程序，处理器100在接收到执行指令后，执行该程序，前述本申请实施例任一实施方式揭示的方法可以应用于处理器100中，或者由处理器100实现。
处理器100可能是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法的各步骤可以通过处理器100中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器100可以是通用处理器，可以包括中央处理器(Central Processing Unit，简称CPU)、网络处理器(Network Processor，简称NP)等；还可以是数字信号处理器(DSP)、专用集成电路(ASIC)、现成可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器101，处理器100读取存储器101中的信息，结合其硬件完成上述方法的步骤。
本申请实施例提供的电子设备与本申请实施例提供的方法出于相同的发明构思，具有与其采用、运行或实现的方法相同的有益效果。
本申请的另一个实施例提供了一种充放电电路的控制系统，包括互相连接的控制模块和充放电电路，充放电电路中电机的中性线与充放电切换桥臂组连接；控制模块用于执行上述任一实施方式的充放电电路的控制方法。
充放电电路例如可以是上述任一实施方式中所采用的充放电电路。
在一些实施方式中，充放电切换桥臂组包括串联的上桥臂和下桥臂，上桥臂和下桥臂的连接点与中性线相连接。
在一些实施方式中，上桥臂包括并联的第一开关和第一二极管，下桥臂包括并联的第二开关和第二二极管；第一二极管的负极与动力电池的正极相连接，第一二极管的正极与第二二极管的负极相连接，第二二极管的正极与动力电池的负极相连接。
在一些实施方式中，电机为M相电机；充放电电路还包括M相桥臂电路，M为正整数；每一相桥臂电路包括串联的上桥臂和下桥臂；M相桥臂电路的M个上下桥臂连接点与M相电机绕组一一对应连接。
在一些实施方式中，充放电电路还包括电流检测模块，电流检测模块串联在中性线与充放电切换桥臂组之间。
在一些实施方式中，充放电电路还包括与动力电池并联的电容。电容能够起到消除干扰的作用。
本申请实施例提供的控制系统，能够实现上述任一实施方式的充放电电路的控制方法，能够根据中性线中的第一电流值、充放电切换桥臂组的已知峰值电流和 中性线的已知峰值电流调控第一电流值的大小，从而能够在动力电池充放电过程中发生电流值异常时及时对电流进行调整，避免损坏电路。
本申请的另一个实施例提供了一种计算机可读存储介质，其上存储有计算机程序，该程序被处理器执行，以实现上述任一实施方式的充放电电路的控制方法。
参考图10所示，其示出的计算机可读存储介质为光盘20，其上存储有计算机程序(即程序产品)，该计算机程序在被处理器运行时，会执行前述任意实施方式所提供的方法。
需要说明的是，计算机可读存储介质的例子还可以包括，但不限于相变内存(PRAM)、静态随机存取存储器(SRAM)、动态随机存取存储器(DRAM)、其他类型的随机存取存储器(RAM)、只读存储器(ROM)、电可擦除可编程只读存储器(EEPROM)、快闪记忆体或其他光学、磁性存储介质，在此不再一一赘述。
本申请的上述实施例提供的计算机可读存储介质与本申请实施例提供的方法出于相同的发明构思，具有与其存储的应用程序所采用、运行或实现的方法相同的有益效果。
需要说明的是：
术语“模块”并非意图受限于特定物理形式。取决于具体应用，模块可以实现为硬件、固件、软件和/或其组合。此外，不同的模块可以共享公共组件或甚至由相同组件实现。不同模块之间可以存在或不存在清楚的界限。
在此提供的算法和显示不与任何特定计算机、虚拟装置或者其它设备固有相关。各种通用装置也可以与基于在此的示例一起使用。根据上面的描述，构造这类装置所要求的结构是显而易见的。此外，本申请也不针对任何特定编程语言。应当明白，可以利用各种编程语言实现在此描述的本申请的内容，并且上面对特定语言所做的描述是为了披露本申请的最佳实施方式。
应该理解的是，虽然附图的流程图中的各个步骤按照箭头的指示依次显示，但是这些步骤并不是必然按照箭头指示的顺序依次执行。除非本文中有明确的说明，这些步骤的执行并没有严格的顺序限制，其可以以其他的顺序执行。而且，附图的流程图中的至少一部分步骤可以包括多个子步骤或者多个阶段，这些子步骤或者阶段并不必然是在同一时刻执行完成，而是可以在不同的时刻执行，其执行顺序也不必然是依次进行，而是可以与其他步骤或者其他步骤的子步骤或者阶段的至少一部分轮流或者交替地执行。
以上所述实施例仅表达了本申请的实施方式，其描述较为具体和详细，但并不能因此而理解为对本申请专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请的保护范围应以所附权利要求为准。

Claims (17)

  1. 一种充放电电路的控制方法，其特征在于，所述充放电电路中电机的中性线与充放电切换桥臂组连接，所述方法包括：
    在所述充放电电路对动力电池进行充放电的过程中，实时获取所述中性线中的第一电流值；
    根据所述第一电流值、第一峰值电流和第二峰值电流，调控所述第一电流值的大小；
    其中，所述第一峰值电流为所述充放电切换桥臂组的已知峰值电流，所述第二峰值电流为所述中性线的已知峰值电流。
  2. 根据权利要求1所述的方法，其特征在于，所述根据所述第一电流值、第一峰值电流和第二峰值电流，调控所述第一电流值的大小，包括：
    根据所述第一电流值与所有第一预设值以及所有第二预设值之间的大小关系，确定对应于所述第一电流值的预设安全值；
    将所述充放电的电流大小调控至所确定的预设安全值；
    其中，各所述第一预设值小于或等于所述第一峰值电流，各所述第二预设值小于或等于所述第二峰值电流；所述所有第一预设值和所述所有第二预设值一一对应；每一所述第一预设值对应设置有一个预设安全值。
  3. 根据权利要求2所述的方法，其特征在于，所述根据所述第一电流值与所有第一预设值以及所有第二预设值之间的大小关系，确定对应于所述第一电流值的预设安全值，包括：
    从所有第一预设值中确定出小于所述第一电流值的最大第一预设值，以及从所有第二预设值中确定出小于所述第一电流值的最大第二预设值；
    确定对应于所述最大第一预设值的第一预设安全值以及对应于所述最大第二预设值的第二预设安全值；
    确定所述第一预设安全值和所述第二预设安全值中的较小值，若二者相等，则以其中任一值作为所述较小值；所述较小值为所述对应于所述第一电流值的预设安全值。
  4. 根据权利要求1所述的方法，其特征在于，
    所述在所述充放电电路对动力电池进行充放电的过程中，实时获取所述中性线中的第一电流值之前，所述方法还包括：
    接收电池管理系统根据动力电池当前状态所获取并发送的请求电流值；各所述预设安全值均小于或等于所述请求电流值。
  5. 根据权利要求1所述的方法，其特征在于，所述实时获取所述中性线中的第一电流值，包括：接收通过电流检测模块实时检测到的第一电流值。
  6. 根据权利要求1所述的方法，其特征在于，所述实时获取所述中性线中的第一电流值，包括：
    接收通过电流检测模块实时检测到的所述电机中每一绕组的电流值；
    计算所有所述绕组的电流值之和，得到所述第一电流值。
  7. 根据权利要求1-6中任一项所述的方法，其特征在于，所述将所述第一电流值调整至所确定的预设安全值，包括：
    根据所述预设安全值与充放电周期之间的对应关系，确定对应于所述所确定的预设安全值的充放电周期值；
    调控当前充放电周期至所确定的充放电周期值。
  8. 根据权利要求7所述的方法，其特征在于，所述调控当前充放电周期包括：
    调控充电回路和放电回路的交替形成频率。
  9. 一种充放电电路的控制装置，其特征在于，所述充放电电路中电机的中性线与充放电切换桥臂组连接，所述装置包括：
    电流值获取模块，用于在所述充放电电路对动力电池进行充放电的过程中，实时获取所述中性线中的第一电流值；
    电流调控模块，用于根据所述第一电流值、第一峰值电流和第二峰值电流，调控所述第一电流值的大小；
    其中，所述第一峰值电流为所述充放电切换桥臂组的已知峰值电流，所述第二峰值电流为所述中性线的已知峰值电流。
  10. 一种电子设备，其特征在于，包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述处理器执行所述程序，以实现如权利要求1-8中任一所述的充放电电路的控制方法。
  11. 一种充放电电路的控制系统，其特征在于，包括互相连接的控制模块和充放电电路，所述充放电电路中电机的中性线与充放电切换桥臂组连接；所述控制模块用于执行如权利要求1-8中任一项所述的充放电电路的控制方法。
  12. 根据权利要求11所述的系统，其特征在于，所述充放电切换桥臂组包括串联的上桥臂和下桥臂，所述上桥臂和所述下桥臂的连接点与所述中性线相连接。
  13. 根据权利要求12所述的系统，其特征在于，所述上桥臂包括并联的第一开关和第一二极管，所述下桥臂包括并联的第二开关和第二二极管；
    所述第一二极管的负极与所述动力电池的正极相连接，所述第一二极管的正极与所述第二二极管的负极相连接，所述第二二极管的正极与所述动力电池的负极相连接。
  14. 根据权利要求11-13任一项所述的系统，其特征在于，所述电机为M相电机；所述充放电电路还包括M相桥臂电路，每一相桥臂电路包括串联的上桥臂和下桥臂；所述M相桥臂电路的M个上下桥臂连接点与所述M相电机绕组一一对应连接。
  15. 根据权利要求11-13任一项所述的系统，其特征在于，所述充放电电路还包括电流检测模块，所述电流检测模块串联在所述中性线与所述充放电切换桥臂组之间。
  16. 根据权利要求11-13任一项所述的系统，其特征在于，所述充放电电路还包括与所述动力电池并联的电容。
  17. 一种计算机可读存储介质，其上存储有计算机程序，其特征在于，该程序被处理器执行，以实现如权利要求1-8中任一所述的充放电电路的控制方法。
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