CN115276175A - Control method and device for battery charging and discharging, electric vehicle and readable storage medium - Google Patents

Control method and device for battery charging and discharging, electric vehicle and readable storage medium Download PDF

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Publication number
CN115276175A
CN115276175A CN202210988687.9A CN202210988687A CN115276175A CN 115276175 A CN115276175 A CN 115276175A CN 202210988687 A CN202210988687 A CN 202210988687A CN 115276175 A CN115276175 A CN 115276175A
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China
Prior art keywords
battery
state
battery pack
fault
charge
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CN202210988687.9A
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Chinese (zh)
Inventor
牛高产
张晓庆
章欣
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202210988687.9A priority Critical patent/CN115276175A/en
Publication of CN115276175A publication Critical patent/CN115276175A/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
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00036—Charger exchanging data with 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
    • 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
    • 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
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/14—Preventing excessive discharging
    • 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
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/15—Preventing overcharging
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/443—Methods for charging or discharging in response to temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00302—Overcharge protection
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00306—Overdischarge protection
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00309—Overheat or overtemperature protection
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • 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
    • 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
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention relates to the technical field of battery management, and discloses a battery charging and discharging control method and device, an electric automobile and a readable storage medium. Wherein, the method comprises the following steps: acquiring state parameters of each battery monomer in the battery pack; analyzing the state parameters of each single battery, and determining the temperature limit value of each single battery, the total voltage of the battery pack, the charge state of the battery pack and the fault state of the battery; and controlling the charging power and the discharging power of the battery based on the temperature limit value of the battery cell, the total voltage of the battery pack, the charge state of the battery pack and the fault state of the battery. By implementing the invention, the battery can be effectively prevented from being overcharged or overdischarged, the utilization efficiency of the battery energy is improved, the power output capability of the battery is ensured, the operation stability of the battery system is improved, and the use safety of the battery system and the driving safety of the electric automobile are ensured.

Description

Control method and device for battery charging and discharging, electric vehicle and readable storage medium
Technical Field
The invention relates to the technical field of battery management, in particular to a battery charging and discharging control method and device, an electric automobile and a readable storage medium.
Background
At present, environmental protection and sustainable energy development are vigorously advocated, and the electric automobile has important significance for replacing an automobile depending on fuel oil. The high-speed development of the new energy automobile market also puts higher requirements on the power battery for the automobile, and although the battery materials and the manufacturing technology are continuously improved to solve the problems of driving range and the like to a certain extent, the battery is used as a power core and key parts of the electric automobile, and safe and reliable battery management is required to avoid the performance deterioration of the battery and prevent the occurrence of damage or serious explosion.
When the battery system works, the battery management system needs to monitor data such as voltage, current and battery temperature of the battery in real time, and power performance, safety and durability of the battery system are guaranteed. The battery management system monitors the battery state by acquiring the battery parameters in real time and controls the charging and discharging power of the battery so as to achieve the purpose of protecting and limiting the working state of the battery.
The overcharge or overdischarge of the battery of the electric automobile can not only damage the battery, but also cause serious safety accidents such as combustion and explosion and the like, and damage the safety of the driver of the electric automobile. Scientific and reasonable battery charge and discharge control can not only ensure the power output capability of the power battery, but also ensure the safety of the battery in the using process, improve the energy utilization efficiency of the battery, slow down the reduction rate of the battery performance and prolong the service life of the battery; and the charge and discharge power control of the battery not only influences the exertion of the power capacity of the battery system, but also can ensure that the electric automobile does not lose power due to faults in the driving process. Therefore, how to control the charging and discharging of the battery to avoid the overcharge or overdischarge of the battery is an urgent technical problem to be solved.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and an apparatus for controlling battery charging and discharging, an electric vehicle, and a readable storage medium, so as to solve the problem that it is difficult to implement battery charging and discharging control in the prior art.
According to a first aspect, an embodiment of the present invention provides a method for controlling charging and discharging of a battery, including: acquiring state parameters of each battery monomer in the battery pack; analyzing the state parameters of each single battery, and determining the temperature limit value of each single battery, the total voltage of the battery pack, the charge state of the battery pack and the battery fault state; and controlling the charging power and the discharging power of the battery based on the temperature limit value of the battery monomer, the total voltage of the battery pack, the charge state of the battery pack and the fault state of the battery.
According to the control method for battery charging and discharging provided by the embodiment of the invention, the temperature limit value of each battery monomer, the charge state of the total voltage battery pack of the battery pack and the battery fault state are determined by analyzing the state parameters of each battery monomer in the battery pack, and the reasonable charging probability and discharging probability are determined according to the analysis result, so that the battery can be effectively prevented from being overcharged or overdischarged, the utilization efficiency of the battery energy is improved, the power output capability of the battery is ensured, the operation stability of the battery system is improved, and the use safety of the battery system and the driving safety of the electric automobile are ensured.
With reference to the first aspect, in a first implementation manner of the first aspect, the controlling charging power and discharging power of a battery based on the temperature limit value of the battery cell, the total voltage of the battery pack, the state of charge of the battery pack, and the battery fault state includes: acquiring a charging power map and a discharging power map corresponding to the battery pack; controlling a discharge current and a discharge power of the battery pack based on the discharge power map; determining a target discharge power based on the battery fault status and the discharge power; controlling a charging current and a charging power of the battery pack based on the charging power map; determining a target charging power based on the battery fault status and the charging power; wherein the charging power map is generated based on a relationship between charging power, charging current, battery state of charge, and temperature; the discharge power map is generated based on a relationship between discharge power, discharge current, battery state of charge, and temperature.
According to the control method for charging and discharging the battery, the discharge power map and the charge power map are constructed, so that the power characteristics of the battery system can be accurately acquired offline, the corresponding charge and discharge power can be conveniently determined according to the charge and discharge state of the battery system, and the overcharge or over-discharge of the battery can be avoided.
With reference to the first embodiment of the first aspect, in a second embodiment of the first aspect, the discharge power map includes a first map of instantaneous discharge current rate with respect to battery state of charge and temperature, and a second map of sustained discharge current rate with respect to battery state of charge and temperature; the controlling of the discharge current and the discharge power of the battery pack based on the discharge power map includes: acquiring the rated capacity of the battery; determining an instantaneous discharge current rate of the battery pack based on the temperature limit value, the state of charge of the battery pack and the first map; multiplying the rated capacity of the battery by the multiplying power of the instantaneous discharge current to obtain the instantaneous discharge current; multiplying the instantaneous discharge current by the total voltage of the battery pack, the current discharge power; determining a continuous discharge current rate of the battery pack based on the temperature limit value, the state of charge of the battery pack and the second map; and multiplying the rated capacity of the battery by the multiplying power of the continuous discharge current to obtain the continuous discharge current.
According to the control method for charging and discharging the battery, provided by the embodiment of the invention, the instantaneous discharge maximum current, the continuous discharge maximum current and the current maximum discharge power of the battery are determined through the first map and the second map, so that the discharge characteristic of the battery can be determined, the discharge state of a battery system can be conveniently controlled according to the discharge characteristic of the battery, the overdischarge of the battery is avoided, the service life of the battery is prolonged, meanwhile, the discharge state of the battery is reasonably controlled, the power loss of an electric automobile due to faults in the driving process can be avoided, and the driving stability of the electric automobile is further ensured.
With reference to the second embodiment of the first aspect, in a third embodiment of the first aspect, the charging power map includes a third map of instantaneous charging power with respect to battery state of charge and temperature, and a fourth map of continuous charging current rate with respect to battery state of charge and temperature; the controlling the charging current and the charging power of the battery pack based on the charging power map includes: determining an instantaneous charge power of the battery pack based on the temperature limit, the state of charge of the battery pack, and the third map; dividing the instantaneous charging power by the total voltage of the battery pack to obtain instantaneous charging maximum current; determining a continuous charging current rate of the battery pack based on the temperature limit value, the state of charge of the battery pack and the fourth map; and multiplying the rated capacity of the battery by the multiplying power of the continuous charging current to obtain the maximum continuous charging current.
According to the control method for charging and discharging the battery, provided by the embodiment of the invention, the instantaneous charging power, the instantaneous charging maximum current and the continuous charging maximum current of the battery are determined through the third map and the fourth map, so that the charging characteristic of the battery can be determined, the charging state of a battery system can be conveniently controlled according to the charging characteristic of the battery, the overcharge of the battery is avoided, the efficient charging of the battery can be realized, and the service life of the battery is prolonged.
With reference to the second or third embodiment of the first aspect, in a fourth embodiment of the first aspect, the method further comprises: and when the temperature limit value of the battery monomer exceeds a preset temperature threshold value, controlling the temperature limit value of the battery monomer within the preset temperature threshold value.
According to the control method for charging and discharging the battery, which is provided by the embodiment of the invention, the temperature limit value of the single battery is controlled within the preset temperature threshold value, so that the charging and discharging performance is prevented from being influenced by overhigh temperature of the battery.
With reference to the first implementation manner of the first aspect, in a fifth implementation manner of the first aspect, the determining a target charging power based on the battery fault status and the charging power includes: determining a target charging coefficient corresponding to the fault level based on the fault level corresponding to the battery fault state; and multiplying the target charging coefficient by the charging power to obtain the target charging power.
According to the control method for charging and discharging the battery, the target charging coefficient of the battery is determined according to the current fault level so as to determine the target charging power, the charging fault caused by overcharge of the battery is avoided, and the charging safety of the battery is ensured.
With reference to the first implementation manner of the first aspect, in a sixth implementation manner of the first aspect, the determining a target discharge power based on the battery fault state and the discharge power includes: determining a target discharge coefficient corresponding to the fault level based on the fault level corresponding to the battery fault state; and multiplying the target discharge coefficient by the discharge power to obtain the target discharge power.
According to the control method for charging and discharging the battery, the target discharging coefficient of the battery is determined according to the current fault level, so that the target discharging power is determined, the discharging fault caused by over-discharging of the battery is avoided, and the discharging safety of the battery and the driving safety of the electric automobile are guaranteed.
With reference to the first aspect, in a seventh implementation form of the first aspect, the state parameters include voltage, current, and temperature of the battery cell; analyzing the state parameters of each single battery, and determining the temperature limit value of each single battery, the total voltage of the battery pack, the state of charge of the battery pack and the battery fault state, wherein the analyzing method comprises the following steps: sequencing the temperature of each single battery, and determining the temperature limit value of each single battery; performing superposition processing on the voltage of each battery monomer to obtain the total voltage of the battery pack; determining the state of charge of the battery pack based on the temperature, the voltage and the current of each single battery by adopting a preset state of charge estimation algorithm; determining the battery fault state based on the temperature limit of the battery cells, the total voltage of the battery pack, the state of charge of the battery pack, and the voltage of the battery cells.
According to the control method for battery charging and discharging provided by the embodiment of the invention, the current state of the battery pack is convenient to monitor by analyzing the state parameters of each battery monomer, so that the charging and discharging power is convenient to control according to the current state of the battery pack, and the battery is protected in a stable working state to the greatest extent.
With reference to the seventh implementation manner of the first aspect, in the eighth implementation manner of the first aspect, the fault state includes a temperature fault of a battery cell, a voltage fault of a battery pack, a state of charge fault of the battery pack, and a voltage fault of the battery cell; the determining the battery fault state based on the temperature limit value of the battery cell, the total voltage of the battery pack, the state of charge of the battery pack, and the voltage of the battery cell includes: judging whether the temperature limit value of the single battery meets a preset temperature threshold value or not; when the temperature limit value of the single battery does not meet the preset temperature threshold value, determining the temperature fault of the single battery based on the deviation between the temperature limit value and the preset temperature threshold value; judging whether the total voltage of the battery pack meets a preset voltage value or not; when the total voltage of the battery pack does not meet the preset voltage value, determining a voltage fault of the battery pack based on a deviation between the total voltage and the preset voltage value; judging whether the charge state of the battery pack meets a preset charge state or not; when the state of charge of the battery pack does not meet the preset state of charge, determining the state of charge fault of the battery pack based on the deviation between the state of charge of the battery pack and the preset state of charge; judging whether the voltage of the battery monomer meets a preset monomer voltage value or not; and when the voltage of the single battery does not meet the preset single voltage value, determining the voltage fault of the single battery based on the deviation between the voltage of the single battery and the preset single voltage value.
According to the control method for charging and discharging the battery, provided by the embodiment of the invention, the temperature limit value of the single battery, the total voltage of the battery pack, the state of charge of the battery pack and the voltage of the single battery are analyzed to determine the temperature fault of the single battery, the voltage fault of the battery pack, the state of charge of the battery pack and the voltage fault of the single battery, so that the charging and discharging of the battery can be conveniently controlled according to the fault state of the battery, and the efficient charging and discharging of the battery can be conveniently realized.
With reference to the eighth embodiment of the first aspect, in the ninth embodiment of the first aspect, the method further comprises: determining the temperature fault level of the single battery, the voltage fault level of the battery pack, the state of charge fault level of the battery pack and the voltage fault level of the single battery; sequencing the temperature fault level of the single battery, the voltage fault level of the battery pack, the state of charge fault level of the battery pack and the voltage fault level of the single battery to determine the maximum fault level; and determining the maximum fault level as a target fault level.
According to the control method for charging and discharging the battery, the maximum fault level is used as the target fault level, so that the charging and discharging power can be determined according to the current fault level of the battery, and the problem that the charging and discharging of the battery are unreasonable due to faults is avoided to the greatest extent.
According to a second aspect, an embodiment of the present invention provides a battery charging and discharging control apparatus, including: the parameter acquisition module is used for acquiring the state parameters of each battery monomer in the battery pack; the state analysis module is used for analyzing the state parameters of the single batteries and determining the temperature limit value of the single batteries, the total voltage of the battery pack, the charge state of the battery pack and the battery fault state; and the control module is used for controlling the charging power and the discharging power of the battery based on the temperature limit value of the single battery, the total voltage of the battery pack, the charge state of the battery pack and the fault state of the battery.
According to a third aspect, an embodiment of the present invention provides an electric vehicle, including: the battery charging and discharging control method according to the first aspect or any one of the embodiments of the first aspect is implemented by executing the computer instructions.
According to a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where computer instructions are stored, and the computer instructions are configured to cause a computer to execute the method for controlling charging and discharging of a battery according to the first aspect or any of the embodiments of the first aspect.
It should be noted that, for the control device for battery charging and discharging, the electric vehicle, and the computer-readable storage medium provided in the embodiment of the present invention, please refer to the description of the corresponding contents in the control method for battery charging and discharging, which is not described herein again.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 shows a block diagram of a battery management system in an embodiment of the invention;
fig. 2 is a flowchart of a control method of charging and discharging a battery according to an embodiment of the present invention;
fig. 3 is another flowchart of a control method of charging and discharging a battery according to an embodiment of the present invention;
fig. 4 is still another flowchart of a control method of charging and discharging a battery according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a first MAP according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a second MAP according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a third MAP according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a fourth MAP according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of the control of discharge power according to an embodiment of the present invention;
FIG. 10 is a control schematic of charging power according to an embodiment of the invention;
fig. 11 is a block diagram of a control apparatus for charging and discharging a battery according to an embodiment of the present invention;
fig. 12 is a schematic diagram of a hardware structure of an electric vehicle according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
When the battery system works, the battery management system needs to monitor data such as voltage, current and battery temperature of the battery in real time, and power performance, safety and durability of the battery system are guaranteed. The battery management system monitors the battery state by acquiring the battery parameters in real time and controls the charging and discharging power of the battery so as to achieve the purpose of protecting and limiting the working state of the battery. The overcharge or overdischarge of the battery of the electric automobile can not only damage the battery, but also cause serious safety accidents such as combustion and explosion, and the like, and damage the safety of the driver of the electric automobile.
Based on the technical scheme, the temperature limit value of each battery monomer, the charge state of the total voltage of the battery pack and the battery fault state are determined by analyzing the state parameters of each battery monomer in the battery pack, and the reasonable charging probability and discharging probability are determined according to the analysis result, so that the overcharge or over-discharge of the battery can be effectively prevented, the utilization efficiency of the energy of the battery is improved, the power output capacity of the battery is ensured, the running stability of the battery system is improved, and the use safety of the battery system and the driving safety of the electric automobile are ensured.
The embodiment of the invention provides a battery management system, which is arranged in an electric automobile. As shown in fig. 1, the system is composed of a data acquisition module, a battery state monitoring module, a state of charge (SOC) estimation module, a fault diagnosis module, a data transmission module and a charge-discharge power control module. The data acquisition module mainly comprises an acquisition device for the voltage, current, temperature and other parameters of the single battery, and is used for completing the information acquisition of the single battery. The data transmission module mainly comprises a CANBus bus and sends the acquired single battery data to the battery state monitoring module, the SOC estimation module and the fault diagnosis module. The battery state monitoring module receives the voltage and the temperature of the battery monomer and calculates to obtain the monomer temperature limit value and the total voltage of the battery; the SOC estimation module calculates the SOC value of the battery pack (namely the state of charge of the battery pack) according to the received battery current, voltage and temperature; and the fault diagnosis module obtains the fault grade of the system according to the set threshold value after obtaining parameters such as the temperature limit value of the single battery, the total voltage of the battery and the like. The charging and discharging power control module obtains the temperature limit value of the battery monomer, the SOC value of the battery pack, the total voltage and the fault grade of the battery pack and the like, obtains the charging and discharging power and the instantaneous/continuous charging and discharging current of the battery system by inquiring a pre-constructed MAP (MAP), and transmits the charging and discharging power and the instantaneous/continuous charging and discharging current to the vehicle control unit through the data transmission module, and the vehicle control unit and the battery management system respectively perform corresponding control to realize real-time charging and discharging power control.
Wherein the map comprises: the MAP of the power battery is characterized by comprising a MAP diagram of instantaneous charging power of the power battery relative to variables such as SOC and temperature, a MAP diagram of instantaneous discharging current multiplying power of the power battery relative to variables such as SOC and temperature, a MAP diagram of continuous charging current multiplying power of the power battery relative to variables such as SOC and temperature, and a MAP diagram of continuous discharging current multiplying power of the power battery relative to variables such as SOC and temperature.
In accordance with an embodiment of the present invention, there is provided an embodiment of a method for controlling battery charging and discharging, where the steps illustrated in the flowchart of the figure may be performed in a computer system such as a set of computer executable instructions, and where a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than that described herein.
In this embodiment, a method for controlling charging and discharging of a battery is provided, which may be used in a battery management system of an electric vehicle, for example, an electric vehicle, and fig. 2 is a flowchart of a method for controlling charging and discharging of a battery according to an embodiment of the present invention, as shown in fig. 2, where the flowchart includes the following steps:
s11, acquiring the state parameters of each battery cell in the battery pack.
The battery pack comprises a plurality of battery cells, as shown in fig. 1. Each battery cell has corresponding state parameters, and the state parameters of the battery cells may be the same or different. The battery management system is provided with a data acquisition module, and the state parameters of each battery monomer in the battery pack are acquired through a state parameter acquisition device arranged in the data acquisition module.
Specifically, the data acquisition module is provided with a temperature acquisition device, a current acquisition device and a voltage acquisition device, and the temperature acquisition device can be used for acquiring the temperature state of each battery cell, the current acquisition device is used for acquiring the current value of each battery cell, and the voltage acquisition device is used for acquiring the voltage value of each battery cell.
And S12, analyzing the state parameters of each single battery, and determining the temperature limit value of each single battery, the total voltage of the battery pack, the charge state of the battery pack and the fault state of the battery.
A battery state monitoring module in the battery management system can determine a temperature limit value according to the temperature of each battery cell, namely the maximum temperature value and the minimum temperature value of each battery cell. Meanwhile, data calculation is carried out according to the voltage of each battery monomer, and the total voltage of the current battery pack is obtained.
The SOC estimation module in the battery management system can adopt algorithms such as an open-circuit voltage method, an ampere-hour integration method or an extended Kalman filtering method to estimate the charge state of the battery pack according to the temperature of each battery cell, the voltage of each battery cell and the current of each battery cell so as to determine the charge state of the battery pack.
The fault diagnosis module in the battery management system can compare the temperature limit value of the battery cell, the total voltage of the battery pack and the state of charge of the battery pack with corresponding threshold values to determine the deviation of the temperature limit value of the battery cell, the total voltage of the battery pack and the state of charge of the battery pack relative to the threshold values, and determine the current battery fault state according to the deviation.
And S13, controlling the charging power and the discharging power of the battery based on the temperature limit value of the single battery, the total voltage of the battery pack, the charge state of the battery pack and the fault state of the battery.
A charging and discharging power control module in the battery management system controls charging current, charging power, discharging current and discharging power of a battery pack according to the temperature limit value of a single battery, the total voltage of the battery pack, the state of charge of the battery pack and the fault state of the battery, and limits the charging current, the charging power, the discharging current and the discharging power within a given current range and a given power range. When the battery is in a charging state, performing charging control according to the charging current and the charging power, and implementing a charging process; and when the battery is in a charging state, performing discharge control according to the discharge current and the discharge power to implement a discharge process.
According to the control method for battery charging and discharging, the temperature limit value of each battery cell, the state of charge of the total voltage of the battery pack and the battery fault state are determined by analyzing the state parameters of each battery cell in the battery pack, and the reasonable charging probability and discharging probability are determined according to the analysis result, so that the battery can be effectively prevented from being overcharged or overdischarged, the utilization efficiency of the battery energy is improved, the power output capacity of the battery is ensured, the operation stability of the battery system is improved, and the use safety of the battery system and the driving safety of the electric automobile are ensured.
In the present embodiment, a method for controlling charging and discharging of a battery is provided, which may be used in the above-mentioned electric vehicle, such as an electric vehicle, regarding a battery management system, etc., fig. 3 is a flowchart of a method for controlling charging and discharging of a battery according to an embodiment of the present invention, and as shown in fig. 3, the flowchart includes the following steps:
and S21, acquiring the state parameters of each battery cell in the battery pack.
For a detailed description, refer to the corresponding related description of the above embodiments, which is not repeated herein.
And S22, analyzing the state parameters of each single battery, and determining the temperature limit value of each single battery, the total voltage of the battery pack, the charge state of the battery pack and the fault state of the battery.
For a detailed description, refer to the corresponding related description of the above embodiments, which is not repeated herein.
And S23, controlling the charging power and the discharging power of the battery based on the temperature limit value of the single battery, the total voltage of the battery pack, the charge state of the battery pack and the fault state of the battery.
Specifically, the step S23 may include:
and S231, acquiring a charging power map and a discharging power map corresponding to the battery pack.
Wherein the charging power map is generated based on a relationship between charging power, charging current, battery state of charge, and temperature; the discharge power map is generated based on a relationship between a discharge current, a battery state of charge, and a temperature.
As an alternative embodiment, the discharge current includes an instantaneous discharge current and a sustained discharge current, and the discharge power map includes a first map of instantaneous discharge current rate with respect to battery state of charge and temperature, and a second map of sustained discharge current rate with respect to battery state of charge and temperature.
Specifically, as shown in fig. 5, a first MAP (MAP is represented by "MAP") constructed with respect to SOC (5% -100%), temperature (-25 ℃ -45 ℃) of instantaneous discharge current rate of the power battery was established according to a plurality of experimental tests; as shown in fig. 6, a second MAP constructed with the sustained discharge current rate of the power battery with respect to SOC (5% -100%), temperature (-25 ℃ -48 ℃) was established according to a plurality of experimental tests. It should be noted that the different "x" in the first MAP and the second MAP may be the same or different, which is specifically determined by actual experimental tests.
As an alternative embodiment, the charging power comprises an instantaneous charging power and the charging current comprises a continuous charging current. The charging power map includes a third map of instantaneous charging power with respect to battery state of charge and temperature, and a fourth map of continuous charging current rate with respect to battery state of charge and temperature.
Specifically, as shown in fig. 7, a third MAP constructed with the instantaneous charging power of the power battery with respect to SOC (5% -100%), temperature (-20 ℃ -50 ℃) was established according to a plurality of experimental tests; as shown in fig. 8, a fourth MAP constructed with the continuous charging current rate of the power battery with respect to SOC (5% -100%), temperature (-10 ℃ -46 ℃) was established according to a plurality of experimental tests. It should be noted that the different "x" in the third MAP and the fourth MAP may be the same or different, and is determined by actual experimental tests.
And S232, controlling the discharge current and the discharge power of the battery pack based on the discharge power map.
Discharge current being the instant allowed by the present battery maximum current for discharge and maximum current for sustained discharge; the discharge power is the maximum discharge power allowed by the current battery.
The charge and discharge power control module in the battery management system may include a charge control module and a discharge control module. The discharging control module can determine the current discharging power and the instantaneous/continuous discharging maximum current by combining the temperature limit value, the state of charge of the battery pack, the first map and the second map.
Specifically, the step S232 may include:
(1) And acquiring the rated capacity of the battery.
The rated capacity of the battery is the rated capacity of the battery pack, namely the amount of electricity which can be discharged by the battery pack. The rated electric quantity of the battery is used as a performance index of the battery, and the performance index information of the battery can be stored in a battery management system. The battery management system can acquire the rated capacity of the battery by reading the performance index information of the battery.
(2) And determining the instantaneous discharge current multiplying power of the battery pack based on the temperature limit value, the charge state of the battery pack and the first map.
(3) And multiplying the rated capacity of the battery by the multiplying power of the instantaneous discharge current to obtain the instantaneous discharge maximum current.
(4) The instantaneous discharge maximum current is multiplied by the total voltage of the battery pack, the current maximum discharge power.
Inquiring a first MAP according to the temperature limit value and the state of charge of the battery pack (namely the SOC value of the battery pack), determining the instantaneous discharge current multiplying power of the current battery pack from the first MAP, and multiplying the instantaneous discharge current multiplying power obtained by inquiring the first MAP by the rated capacity of the battery to obtain the instantaneous discharge maximum current; then, based on the relationship "power = current × voltage", the maximum instantaneous discharge current is multiplied by the total voltage of the battery pack, so as to obtain the maximum discharge power of the current battery pack, as shown in fig. 9.
(5) And determining the continuous discharge current multiplying power of the battery pack based on the temperature limit value, the charge state of the battery pack and the second map.
(6) And multiplying the rated capacity of the battery by the rate of the continuous discharge current to obtain the maximum continuous discharge current.
Querying a second MAP according to the temperature limit value and the state of charge of the battery pack (i.e., the SOC value of the battery pack), determining a continuous discharge current multiplying factor of the current battery pack from the second MAP, and multiplying the continuous discharge current multiplying factor obtained by querying the second MAP by the rated capacity of the battery to obtain the maximum continuous discharge current, as shown in fig. 9.
The instantaneous discharge maximum current, the continuous discharge maximum current and the current maximum discharge power of the battery are determined through the first map and the second map, so that the discharge characteristic of the battery can be determined, the discharge state of the battery system is controlled conveniently according to the discharge characteristic of the battery, the overdischarge of the battery is avoided, the service life of the battery is prolonged, meanwhile, the discharge state of the battery is reasonably controlled, the phenomenon that the electric automobile loses power due to faults in the driving process can be avoided, and the driving stability of the electric automobile is further ensured.
It should be noted that, when the temperature limit value of the battery cell exceeds the preset temperature threshold value, the temperature limit value of the battery cell is controlled within the preset temperature threshold value.
The preset temperature threshold is two preset thresholds related to temperature, namely a highest temperature threshold and a lowest temperature threshold. The preset temperature threshold is determined by those skilled in the art according to the actual performance of the battery pack, and is not particularly limited herein. The temperature limit value of the battery monomer is the maximum temperature value and the minimum temperature value of the battery monomer acquired in real time. If the maximum temperature value of the single battery is larger than the maximum temperature threshold value, limiting the maximum temperature value of the single battery at the maximum temperature threshold value; and if the temperature minimum value of the battery cell is smaller than the lowest temperature threshold value, limiting the temperature minimum value of the battery cell at the lowest temperature threshold value. Then, the discharge current and the discharge power are determined according to the currently limited temperature limit value, and for specific description, refer to the above embodiments, which are not described herein again.
The temperature limit value of the single battery is controlled within the preset temperature threshold value, so that the charging and discharging performance is prevented from being influenced by overhigh temperature of the battery.
S233, a target discharge power is determined based on the battery fault state and the discharge power.
Different battery fault states can correspond to different discharge coefficients, so that the target discharge power can be determined according to the current discharge coefficient and the discharge power. Specifically, the step S233 may include:
(1) And determining a target discharge coefficient corresponding to the fault grade based on the fault grade corresponding to the battery fault state.
The battery fault state can be characterized by a fault grade, the fault grade is determined by the degree of deviation of a battery state parameter value from a standard value, and different discharge coefficients are used for different fault grades. Specifically, the temperature limit value of the battery cell, the total voltage of the battery pack, the state of charge of the battery pack, and the voltage of the battery cell have corresponding standard values. The standard value is determined by a technician according to the performance index of the battery pack, and is not particularly limited herein.
If the fault grades are divided into a primary fault, a secondary fault, a tertiary fault and a 0-level fault according to the degree of deviation of the battery state parameter values from the standard values, the primary fault, the secondary fault, the tertiary fault and the 0-level fault respectively have corresponding discharge coefficients.
Accordingly, the discharging module in the battery management system may determine a target discharging coefficient corresponding to a fault level corresponding to the current fault state according to the fault level.
(2) And multiplying the target discharge coefficient by the discharge power to obtain the target discharge power.
As shown in fig. 9, if for a primary fault, the corresponding discharge coefficient is 50%; for the secondary fault and the tertiary fault, the corresponding discharge coefficient is 0 percent; for a class 0 fault, the corresponding discharge coefficient is 100%.
Specifically, when the fault grade corresponding to the current fault state is one grade, the target discharge power is controlled to be 50% of the current maximum discharge power; when the fault grade corresponding to the current fault state is two-level or three-level, the current fault grade is high, and at the moment, in order to ensure the use safety of the battery, the target discharge power is controlled to be 0% of the current maximum discharge power; and when the fault grade corresponding to the current fault state is 0 grade, the current battery state is better, and the target discharge power is controlled to be 100% of the current maximum discharge power. The discharging power is the maximum discharging power allowed currently.
And determining a target discharge coefficient of the battery through the current fault level to determine target discharge power, so that discharge faults caused by over-discharge of the battery are avoided, and the discharge safety of the battery and the running safety of the electric automobile are ensured.
And S234, controlling the charging current and the charging power of the battery pack based on the charging power map.
The charging current is the maximum instantaneous charging current and the maximum continuous charging current allowed by the current battery; the charging power is the maximum charging power allowed by the current battery.
The charging control module in the battery management system can determine the current charging power and the instantaneous/continuous charging maximum current by combining the temperature limit value, the state of charge of the battery pack, the third map and the fourth map.
In particular, the amount of the solvent to be used, the step S234 may include:
(1) And determining the instantaneous charging power of the battery pack based on the temperature limit value, the state of charge of the battery pack and the third map.
(2) And (4) dividing the instantaneous charging power by the total voltage of the battery pack to obtain the instantaneous charging maximum current.
And querying a third MAP according to the temperature limit value and the state of charge of the battery pack (namely the SOC value of the battery pack), and determining the instantaneous charging power (namely the current maximum charging power) of the current battery pack from the third MAP. Based on the relationship "current power = power ÷ voltage", the instantaneous charging power obtained by querying the third MAP is divided by the total voltage of the battery pack to obtain the instantaneous charging maximum current, as shown in fig. 10.
(3) And determining the continuous charging current multiplying power of the battery pack based on the temperature limit value, the charge state of the battery pack and the fourth map.
(4) And multiplying the rated capacity of the battery by the multiplying power of the continuous charging current to obtain the maximum continuous charging current.
The fourth MAP is queried according to the temperature limit value and the state of charge of the battery pack (i.e., the SOC value of the battery pack), the continuous charging current multiplying power of the current battery pack is determined from the fourth MAP, and the continuous charging current multiplying power obtained by querying the fourth MAP is multiplied by the rated capacity of the battery to obtain the maximum continuous charging current, as shown in fig. 10.
Through the third map and the fourth map, the instantaneous charging power, the instantaneous charging maximum current and the continuous charging maximum current of the battery are determined, so that the charging characteristic of the battery can be determined, the charging state of the battery system is controlled conveniently according to the charging characteristic of the battery, the overcharge of the battery is avoided, the efficient charging of the battery can be realized, and the service life of the battery is prolonged.
It should be noted that, when the temperature limit value of the battery cell exceeds the preset temperature threshold value, the temperature limit value of the battery cell is controlled within the preset temperature threshold value.
For a detailed description of the preset temperature threshold and the temperature limit, reference is made to the above-mentioned embodiments, which are not described herein again. If the maximum temperature value of the battery monomer is larger than the maximum temperature threshold value, limiting the maximum temperature value of the battery monomer at the maximum temperature threshold value; and if the temperature minimum value of the battery cell is smaller than the lowest temperature threshold value, limiting the temperature minimum value of the battery cell at the lowest temperature threshold value. Then, the charging current and the charging power are determined according to the currently limited temperature limit value, and for specific description, refer to the above embodiments, which are not described herein again.
The temperature limit value of the single battery is controlled within the preset temperature threshold value, so that the charging and discharging performance is prevented from being influenced by overhigh temperature of the battery.
And S235, determining a target charging power based on the battery fault state and the charging power.
Different battery fault states can correspond to different charging coefficients, and therefore the target charging power can be determined according to the current charging coefficient and the charging power. Specifically, the step S235 may include:
(1) And determining a target charging coefficient corresponding to the fault level based on the fault level corresponding to the battery fault state. For detailed description, refer to the related description of the above embodiments, and are not repeated herein.
(2) And multiplying the target charging coefficient by the charging power to obtain the target charging power.
As shown in fig. 10, if for a primary fault, the corresponding charge factor is 50%; for the second-level fault and the third-level fault, the corresponding charging coefficient is 0%; for a class 0 fault, the corresponding discharge coefficient is 100%.
Specifically, when the fault grade corresponding to the current fault state is one level, the target charging power is controlled to be 50% of the current maximum charging power; when the fault grade corresponding to the current fault state is two-grade or three-grade, the current fault grade is higher, and at the moment, in order to ensure the charging safety of the battery, the target charging power is controlled to be 0% of the current maximum charging power; and when the fault grade corresponding to the current fault state is 0 grade, the current battery state is better, and the target charging power is controlled to be 100% of the current maximum charging power. And the charging power is the maximum charging power allowed currently.
The target charging coefficient of the battery is determined according to the current fault level so as to determine the target charging power, thereby avoiding charging faults caused by overcharge of the battery and ensuring the charging safety of the battery.
According to the control method for charging and discharging the battery, the power characteristics of the battery system can be accurately acquired offline by constructing the discharge power map and the charge power map, so that the corresponding charge and discharge power can be conveniently determined according to the charge and discharge state of the battery system, and the overcharge or over-discharge of the battery can be avoided.
In the present embodiment, a method for controlling charging and discharging of a battery is provided, which may be used in the above-mentioned electric vehicle, such as an electric vehicle, regarding a battery management system, etc., fig. 4 is a flowchart of a method for controlling charging and discharging of a battery according to an embodiment of the present invention, and as shown in fig. 4, the flowchart includes the following steps:
and S31, acquiring the state parameters of each battery cell in the battery pack.
For a detailed description, refer to the corresponding related description of the above embodiments, which is not repeated herein.
And S32, analyzing the state parameters of each single battery, and determining the temperature limit value of each single battery, the total voltage of the battery pack, the charge state of the battery pack and the fault state of the battery.
As an alternative embodiment, the state parameters may include the voltage, current and temperature of the battery cell. Accordingly, the step S32 may include:
s321, sorting the temperatures of the battery cells, and determining the temperature limit value of the battery cells.
The temperature limit includes a maximum temperature of the battery cell and a minimum temperature of the battery cell. A battery state monitoring module in the battery management system can sequence the temperature of each battery monomer acquired by the data acquisition module from low to high or from high to low, and the maximum temperature value and the minimum temperature value of each battery monomer can be determined according to a sequencing result.
And S322, performing superposition processing on the voltage of each battery cell to obtain the total voltage of the battery pack.
The total voltage of the battery pack is the total voltage which can be output by the battery pack at present. The battery state monitoring module in the battery management system can accumulate the voltage of each battery monomer acquired by the data acquisition module, and the voltage accumulation result is the total voltage of the battery pack.
And S323, determining the charge state of the battery pack based on the temperature, the voltage and the current of each battery cell by adopting a preset charge state estimation algorithm.
The state of charge of the battery pack is used to characterize the ratio of the remaining dischargeable charge of the battery to its fully charged state. The preset state-of-charge estimation algorithm comprises an open-circuit voltage method, an ampere-hour integration method, an extended Kalman filtering method and other algorithms, and a person skilled in the art can determine the required algorithm according to actual requirements. For example, the SOC estimation module in the battery management system may calculate the state of charge of the battery pack, that is, the SOC value of the battery pack, according to the temperature, the voltage and the current of the battery cell by using an open-circuit voltage method in combination with an ampere-hour integration method.
And S324, determining the battery fault state based on the temperature limit value of the battery cell, the total voltage of the battery pack, the charge state of the battery pack and the voltage of the battery cell.
The fault diagnosis module in the battery management system can sequentially compare the temperature limit value of the battery monomer, the total voltage of the battery pack, the state of charge of the battery pack and the voltage of the battery monomer with corresponding threshold values, and determine the current battery fault state according to the threshold value comparison result.
As an alternative embodiment, the fault state includes a temperature fault of the battery cell, a voltage fault of the battery pack, a state of charge fault of the battery pack, and a voltage fault of the battery cell. Accordingly, the step S324 may include:
(1) And judging whether the temperature limit value of the battery monomer meets a preset temperature threshold value.
(2) When the temperature limit value of the battery cell does not meet the preset temperature threshold value, determining the temperature fault of the battery cell based on the deviation between the temperature limit value and the preset temperature threshold value.
The preset temperature threshold is a preset maximum temperature threshold and a preset minimum temperature threshold, and the preset temperature threshold may be set according to actual requirements, and is not specifically limited herein. The temperature fault is characterized by a temperature fault level that is determined based on the extent to which the temperature limit deviates from a preset temperature threshold.
A fault diagnosis module in the battery management system compares the temperature limit value with a preset temperature threshold value to determine whether the maximum temperature value is greater than the maximum temperature threshold value and whether the minimum temperature value is less than the minimum temperature threshold value. If the maximum temperature value is greater than the maximum temperature threshold value and/or the minimum temperature value is less than the minimum temperature threshold value, the temperature limit value of the battery monomer does not meet the preset temperature threshold value. At this time, the fault diagnosis module may determine the temperature fault of the battery cell according to a deviation between the maximum temperature value and the maximum temperature threshold value, and/or a deviation between the minimum temperature value and the minimum temperature threshold value.
For example, when the range in which the temperature limit value deviates from the preset temperature threshold value is in [ T1, T2), the temperature fault level may be set to 1 level; when the range of the temperature limit value deviating from the preset temperature threshold value is [ T2, T3), [ 2 ] grade of temperature fault can be set; when the range of the temperature limit value deviating from the preset temperature threshold value is [ T3, T4), [ 3 ] grade of temperature fault can be set; the temperature fault level may be set to level 0 when the range of the temperature limit value deviating from the preset temperature threshold value is [0, T1'). The values of T1, T2, T3, and T4 may be determined according to actual requirements, and are not specifically shown here. For example, T1=2 ℃, T2=5 ℃, T3=8 ℃, T4=10 ℃.
(3) And judging whether the total voltage of the battery pack meets a preset voltage value or not.
(4) When the total voltage of the battery pack does not satisfy the preset voltage value, determining a voltage fault of the battery pack based on a deviation between the total voltage and the preset voltage value.
The preset voltage value is a preset voltage threshold, which can be set according to actual requirements, and is not limited specifically here. The voltage fault of the battery pack is characterized by a voltage fault level that is determined based on the degree to which the total voltage of the battery pack deviates from a predetermined voltage threshold.
A fault diagnosis module in the battery management system compares the total voltage of the battery pack with a preset voltage threshold to determine whether the total voltage of the battery pack is within the preset voltage threshold. If the total voltage of the battery pack is not within the preset voltage threshold, the total voltage of the battery pack does not meet the preset voltage threshold. At this time, the fault diagnosis module may determine the voltage fault of the battery cell according to a deviation between the total voltage of the battery pack and a preset voltage threshold.
For example, when the range of the total voltage of the battery pack deviating from the preset voltage threshold is at [ V1, V2), the voltage fault level may be set to level 1; when the range of the voltage limit value deviating from the preset voltage threshold value is in [ V2, V3), the voltage fault level can be set to be 2 level; when the range of the voltage limit value deviating from the preset voltage threshold value is [ V3, V4 ], the voltage fault level can be set to be 3 levels; the range in which the voltage limit value deviates from the preset voltage threshold value is in [0, V1), the voltage fault level may be set to 0 level. The values of V1, V2, V3 and V4 may be determined according to actual requirements, and are not specifically shown here. For example, V1=3v, v2=5v, v3=10v, v4=15v.
(5) And judging whether the charge state of the battery pack meets a preset charge state or not.
(6) And when the state of charge of the battery pack does not meet the preset state of charge, determining the state of charge fault of the battery pack based on the deviation between the state of charge of the battery pack and the preset state of charge.
The preset state of charge is a ratio of a preset remaining dischargeable electric quantity of the battery to an electric quantity of a fully charged state of the battery, and the preset state of charge may be set according to an actual requirement, and is not specifically limited herein. The state of charge fault is characterized by a state of charge fault level, which is determined according to the degree to which the state of charge of the battery pack deviates from a preset state of charge.
The fault diagnosis module in the battery management system compares the charge state of the battery pack with a preset charge state to determine whether the charge state of the battery pack is in the preset charge state. And if the state of charge of the battery pack does not meet the preset state of charge. At this time, the fault diagnosis module may determine the state of charge fault of the battery cell according to a deviation degree between the state of charge of the battery pack and a preset state of charge.
Specifically, when the range of the state of charge of the battery pack deviating from the preset state of charge is [ S1, S2 ], the state of charge fault level may be set to level 1; when the range of the state of charge of the battery pack deviating from the preset state of charge is in the range of [ S2, S3 ], the state of charge fault level can be set to be 2 level; when the range of the state of charge of the battery pack deviating from the preset state of charge is in the range of [ S3, S4 ], the failure level of the state of charge can be set to be 3 level; when the range of the state of charge of the battery pack deviating from the preset state of charge is [0, S1 ], the state of charge fault level can be set to 0. The values of S1, S2, S3, and S4 may be determined according to actual requirements, and are not specifically shown here. For example, S1=5%, T2=10%, T3=15%, T4=20%.
(7) And judging whether the voltage of the battery monomer meets a preset monomer voltage value or not.
(8) And when the voltage of the single battery does not meet the preset single voltage value, determining the voltage fault of the single battery based on the deviation between the voltage of the single battery and the preset single voltage value.
The preset cell voltage value is a preset maximum voltage value of the battery cell, and the preset cell voltage value may be set according to actual requirements, and is not specifically limited herein. The voltage faults of the battery cells are characterized by a voltage fault grade, which is determined according to the degree to which the voltage of the battery cells deviates from a preset cell voltage value.
A fault diagnosis module in the battery management system compares the voltage of the battery monomer with a preset monomer voltage value to determine whether the voltage of the battery monomer is larger than the preset monomer voltage value. If the voltage of the single battery is larger than the preset voltage value of the single battery, the voltage of the single battery does not meet the preset voltage value of the single battery. At this time, the fault diagnosis module may determine the voltage fault of the battery cell according to a degree of deviation between the voltage of the battery cell and a preset cell voltage value.
Specifically, when the voltage of the battery cell deviates from the preset cell voltage value within the range of [ U1, U2), the voltage fault level of the battery cell may be set to level 1; when the voltage of the battery monomer deviates from the preset monomer voltage value within the range of [ U2, U3 ], setting the voltage fault level of the battery monomer to be 2 level; when the voltage of the battery monomer deviates from the preset monomer voltage value within the range of [ U3, U4 ], the voltage fault level of the battery monomer can be set to be 3 grade; when the voltage of the battery cell deviates from the preset cell voltage value within the range of [0, U1), the voltage fault level of the battery cell can be set to 0 level. The values of U1, U2, U3, and U4 may be determined according to actual requirements, and are not specifically shown here. For example, U1=3v, u2=5v, u3=10v, and u4=15v.
The temperature limit value of the single battery, the total voltage of the battery pack, the charge state of the battery pack and the voltage of the single battery are analyzed to determine the temperature fault of the single battery, the voltage fault of the battery pack, the charge state fault of the battery pack and the voltage fault of the single battery, so that the charging and discharging of the battery can be controlled conveniently according to the fault state of the battery, and the efficient charging and discharging of the battery can be realized.
As an optional implementation, the method may further include:
(1) And determining the temperature fault level of the single battery, the voltage fault level of the battery pack, the state of charge fault level of the battery pack and the voltage fault level of the single battery.
(2) And sequencing the temperature fault level of the single battery, the voltage fault level of the battery pack, the state of charge fault level of the battery pack and the voltage fault level of the single battery to determine the maximum fault level.
(3) And determining the maximum fault level as a target fault level.
The target fault level is the current battery fault level. And a fault diagnosis module in the battery management system sequences the temperature fault level of the single battery, the voltage fault level of the battery pack, the state of charge fault level of the battery pack and the voltage fault level of the single battery determined by the fault diagnosis module so as to determine the maximum fault level. And determining the charging and discharging power by taking the maximum fault level as a target fault level. For example, if the temperature fault level of the battery cell is 3 levels, the voltage fault level of the battery pack is 1 level, the state of charge fault level of the battery pack is 2 levels, and the voltage fault level of the battery cell is 1 level, the target fault level is 3 levels, and at this time, the charge and discharge power control module in the battery management system may control the charge and discharge power of the battery according to the 3 levels of faults.
The maximum fault level is used as the target fault level, so that the charging and discharging power can be determined according to the current battery fault level, and the problem that the battery is unreasonably charged and discharged due to faults is avoided to the greatest extent.
And S33, controlling the charging power and the discharging power of the battery based on the temperature limit value of the single battery, the total voltage of the battery pack, the charge state of the battery pack and the fault state of the battery.
For a detailed description, refer to the corresponding related description of the above embodiments, which is not repeated herein.
According to the control method for charging and discharging the battery, the current state of the battery pack is conveniently monitored by analyzing the state parameters of each battery cell, so that the charging and discharging power is controlled according to the current state of the battery pack, and the battery is protected to be in a stable working state to the greatest extent.
In this embodiment, a battery charging and discharging control device is further provided, and the device is used to implement the foregoing embodiments and preferred embodiments, and the description of the device is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
The present embodiment provides a battery charge/discharge control device, as shown in fig. 11, including:
and the parameter acquisition module 41 is configured to acquire state parameters of each battery cell in the battery pack.
And the state analysis module 42 is configured to analyze the state parameters of each battery cell, and determine a temperature limit value of each battery cell, a total voltage of the battery pack, a state of charge of the battery pack, and a battery fault state.
And the control module 43 is used for controlling the charging power and the discharging power of the battery based on the temperature limit value of the battery cell, the total voltage of the battery pack, the state of charge of the battery pack and the fault state of the battery.
Specifically, the control module 43 is configured to obtain a charging power map and a discharging power map corresponding to the battery pack; controlling a discharge current and a discharge power of the battery pack based on the discharge power map; determining a target discharge power based on the battery fault state and the discharge power; controlling a charging current and a charging power of the battery pack based on the charging power map; determining a target charging power based on a battery fault state and the charging power; wherein the charging power map is generated based on a relationship between charging power, charging current, battery state of charge, and temperature; the discharge power map is generated based on a relationship between a discharge current, a battery state of charge, and a temperature.
Specifically, the discharge power map includes a first map of an instantaneous discharge current rate with respect to a state of charge and a temperature of the battery, and a second map of a continuous discharge current rate with respect to the state of charge and the temperature of the battery, and accordingly, the control module 43 is further specifically configured to obtain a rated capacity of the battery; determining the instantaneous discharge current multiplying power of the battery pack based on the temperature limit value, the charge state of the battery pack and the first map; multiplying the rated capacity of the battery by the multiplying power of the instantaneous discharge current to obtain the instantaneous discharge maximum current; multiplying the instantaneous discharge current by the total voltage of the battery pack to obtain the current maximum discharge power; determining the continuous discharge current multiplying power of the battery pack based on the temperature limit value, the charge state of the battery pack and the second map; and multiplying the rated capacity of the battery by the rate of the continuous discharge current to obtain the maximum continuous discharge current.
Specifically, the charging power map includes a third map of instantaneous charging power with respect to battery state of charge and temperature, and a fourth map of continuous charging current rate with respect to battery state of charge and temperature. Correspondingly, the control module 43 is further specifically configured to determine the instantaneous charging power of the battery pack based on the temperature limit value, the state of charge of the battery pack, and the third map; dividing the instantaneous charging power by the total voltage of the battery pack to obtain instantaneous charging maximum current; determining the continuous charging current multiplying power of the battery pack based on the temperature limit value, the charge state of the battery pack and the fourth map; and multiplying the rated capacity of the battery by the multiplying power of the continuous charging current to obtain the maximum continuous charging current.
As an optional embodiment, the control device for charging and discharging the battery further includes:
and the limiting module is used for controlling the temperature limit value of the battery monomer within the preset temperature threshold value when the temperature limit value of the battery monomer exceeds the preset temperature threshold value.
Optionally, the control module 43 is further specifically configured to determine a target charging coefficient corresponding to a fault level based on the fault level corresponding to the battery fault state; and multiplying the target charging coefficient by the charging power to obtain the target charging power.
Optionally, the control module 43 is further specifically configured to determine a target discharge coefficient corresponding to a fault level based on the fault level corresponding to the battery fault state; and multiplying the target discharge coefficient by the discharge power to obtain the target discharge power.
Optionally, the state parameters include voltage, current and temperature of the battery cell. Correspondingly, the parameter acquisition module 41 is specifically configured to sequence the temperatures of the battery cells and determine the temperature limit value of the battery cell; performing superposition processing on the voltage of each battery monomer to obtain the total voltage of the battery pack; determining the charge state of the battery pack based on the temperature, voltage and current of each battery cell by adopting a preset charge state estimation algorithm; the battery fault state is determined based on the temperature limit of the battery cells, the total voltage of the battery pack, the state of charge of the battery pack, and the voltage of the battery cells.
Optionally, the fault state includes a temperature fault of the battery cell, a voltage fault of the battery pack, a state of charge fault of the battery pack, and a voltage fault of the battery cell. Correspondingly, the parameter collecting module 41 is further specifically configured to determine whether the temperature limit value of the battery cell meets a preset temperature threshold value; when the temperature limit value of the single battery does not meet the preset temperature threshold value, determining the temperature fault of the single battery based on the deviation between the temperature limit value and the preset temperature threshold value; judging whether the total voltage of the battery pack meets a preset voltage value or not; when the total voltage of the battery pack does not meet a preset voltage value, determining a voltage fault of the battery pack based on a deviation between the total voltage and the preset voltage value; judging whether the charge state of the battery pack meets a preset charge state or not; when the state of charge of the battery pack does not meet the preset state of charge, determining the state of charge fault of the battery pack based on the deviation between the state of charge of the battery pack and the preset state of charge; judging whether the voltage of the battery monomer meets a preset monomer voltage value or not; and when the voltage of the single battery does not meet the preset single voltage value, determining the voltage fault of the single battery based on the deviation between the voltage of the single battery and the preset single voltage value.
As an optional embodiment, the control device for charging and discharging the battery further includes:
the first determining module is used for determining the temperature fault level of the single battery, the voltage fault level of the battery pack, the state of charge fault level of the battery pack and the voltage fault level of the single battery.
And the sequencing module is used for sequencing the temperature fault level of the single battery, the voltage fault level of the battery pack, the state of charge fault level of the battery pack and the voltage fault level of the single battery to determine the maximum fault level.
And the second determining module is used for determining the maximum fault level as the target fault level.
The battery charging and discharging control device in this embodiment is in the form of a functional unit, where the unit refers to an ASIC circuit, a processor and a memory executing one or more software or fixed programs, and/or other devices that can provide the above functions.
Further functional descriptions of the modules are the same as those of the corresponding embodiments, and are not repeated herein.
An embodiment of the present invention further provides an electric vehicle, which includes the battery charging and discharging control apparatus shown in fig. 11.
Referring to fig. 12, fig. 12 is a schematic structural diagram of an electric vehicle according to an alternative embodiment of the present invention, and as shown in fig. 12, the electric vehicle may include: at least one processor 501, such as a CPU (Central Processing Unit), at least one communication interface 503, memory 504, and at least one communication bus 502. Wherein a communication bus 502 is used to enable connective communication between these components. The communication interface 503 may include a Display (Display) and a Keyboard (Keyboard), and the optional communication interface 503 may also include a standard wired interface and a standard wireless interface. The Memory 504 may be a Random Access Memory (RAM) or a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The memory 504 may optionally be at least one storage device located remotely from the processor 501. Wherein the processor 501 may be in connection with the apparatus described in fig. 11, an application program is stored in the memory 504, and the processor 501 calls the program code stored in the memory 504 for performing any of the method steps described above.
The communication bus 502 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The communication bus 502 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 12, but this is not intended to represent only one bus or type of bus.
The memory 504 may include a volatile memory (RAM), such as a random-access memory (RAM); the memory may also include a non-volatile memory (english: flash memory), such as a Hard Disk Drive (HDD) or a solid-state drive (SSD); the memory 504 may also comprise a combination of the above types of memory.
The processor 501 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of CPU and NP.
The processor 501 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.
Optionally, the memory 504 is also used to store program instructions. The processor 501 may call program instructions to implement the method for controlling charging and discharging of a battery as shown in the embodiments of fig. 2 to 4 of the present application.
The embodiment of the invention also provides a non-transitory computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions can execute the control method for charging and discharging the battery in any method embodiment. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims (13)

1. A method for controlling charging and discharging of a battery, comprising:
acquiring state parameters of each battery monomer in the battery pack;
analyzing the state parameters of each single battery, and determining the temperature limit value of each single battery, the total voltage of the battery pack, the charge state of the battery pack and the battery fault state;
and controlling the charging power and the discharging power of the battery based on the temperature limit value of the battery monomer, the total voltage of the battery pack, the charge state of the battery pack and the fault state of the battery.
2. The method of claim 1, wherein controlling the charging power and the discharging power of the battery based on the temperature limit value of the battery cells, the total voltage of the battery pack, the state of charge of the battery pack, and the battery fault state comprises:
acquiring a charging power map and a discharging power map corresponding to the battery pack;
controlling a discharge current and a discharge power of the battery pack based on the discharge power map;
determining a target discharge power based on the battery fault status and the discharge power;
controlling a charging current and a charging power of the battery pack based on the charging power map;
determining a target charging power based on the battery fault status and the charging power;
wherein the charging power map is generated based on a relationship between charging power, charging current, battery state of charge, and temperature; the discharge power map is generated based on a relationship between a discharge current, a battery state of charge, and a temperature.
3. The method of claim 2, wherein the discharge power map comprises a first map of instantaneous discharge current rate versus battery state of charge and temperature, and a second map of sustained discharge current rate versus battery state of charge and temperature; the controlling of the discharge current and the discharge power of the battery pack based on the discharge power map includes:
acquiring the rated capacity of the battery;
determining an instantaneous discharge current rate of the battery pack based on the temperature limit value, the state of charge of the battery pack and the first map;
multiplying the rated capacity of the battery by the multiplying power of the instantaneous discharge current to obtain the instantaneous discharge maximum current;
multiplying the instantaneous discharge current by the total voltage of the battery pack, the current maximum discharge power;
determining a continuous discharge current rate of the battery pack based on the temperature limit value, the state of charge of the battery pack and the second map;
and multiplying the rated capacity of the battery by the rate of the continuous discharge current to obtain the maximum continuous discharge current.
4. The method of claim 3, wherein the charging power map comprises a third map of instantaneous charging power versus battery state of charge and temperature, and a fourth map of continuous charging current rate versus battery state of charge and temperature; the controlling the charging current and the charging power of the battery pack based on the charging power map includes:
determining an instantaneous charge power of the battery pack based on the temperature limit, the state of charge of the battery pack, and the third map;
dividing the instantaneous charging power by the total voltage of the battery pack to obtain instantaneous charging maximum current;
determining a continuous charging current rate of the battery pack based on the temperature limit value, the state of charge of the battery pack and the fourth map;
and multiplying the rated capacity of the battery by the multiplying power of the continuous charging current to obtain the maximum continuous charging current.
5. The method of claim 3 or 4, further comprising:
and when the temperature limit value of the battery monomer exceeds a preset temperature threshold value, controlling the temperature limit value of the battery monomer within the preset temperature threshold value.
6. The method of claim 2, wherein determining a target charging power based on the battery fault status and the charging power comprises:
determining a target charging coefficient corresponding to the fault level based on the fault level corresponding to the battery fault state;
and multiplying the target charging coefficient by the charging power to obtain the target charging power.
7. The method of claim 2, wherein determining a target discharge power based on the battery fault status and the discharge power comprises:
determining a target discharge coefficient corresponding to the fault level based on the fault level corresponding to the battery fault state;
and multiplying the target discharge coefficient by the discharge power to obtain the target discharge power.
8. The method of claim 1, wherein the state parameters include voltage, current, and temperature of the battery cell; the analyzing the state parameters of each single battery to determine the temperature limit value of the single battery, the total voltage of the battery pack, the state of charge of the battery pack and the battery fault state comprises the following steps:
sequencing the temperature of each single battery, and determining the temperature limit value of each single battery;
performing superposition processing on the voltage of each battery monomer to obtain the total voltage of the battery pack;
determining the state of charge of the battery pack based on the temperature, the voltage and the current of each single battery by adopting a preset state of charge estimation algorithm;
determining the battery fault state based on the temperature limit of the battery cells, the total voltage of the battery pack, the state of charge of the battery pack, and the voltage of the battery cells.
9. The method of claim 8, wherein the fault conditions include a temperature fault of a cell, a voltage fault of a battery pack, a state of charge fault of a battery pack, and a voltage fault of a cell; the determining the battery fault state based on the temperature limit value of the battery cell, the total voltage of the battery pack, the state of charge of the battery pack, and the voltage of the battery cell includes:
judging whether the temperature limit value of the single battery meets a preset temperature threshold value or not;
when the temperature limit value of the single battery does not meet the preset temperature threshold value, determining the temperature fault of the single battery based on the deviation between the temperature limit value and the preset temperature threshold value;
judging whether the total voltage of the battery pack meets a preset voltage value or not;
when the total voltage of the battery pack does not meet the preset voltage value, determining a voltage fault of the battery pack based on a deviation between the total voltage and the preset voltage value;
judging whether the charge state of the battery pack meets a preset charge state or not;
when the state of charge of the battery pack does not meet the preset state of charge, determining the state of charge fault of the battery pack based on the deviation between the state of charge of the battery pack and the preset state of charge;
judging whether the voltage of the battery monomer meets a preset monomer voltage value or not;
and when the voltage of the single battery does not meet the preset single voltage value, determining the voltage fault of the single battery based on the deviation between the voltage of the single battery and the preset single voltage value.
10. The method of claim 9, further comprising:
determining the temperature fault level of the single battery, the voltage fault level of the battery pack, the state of charge fault level of the battery pack and the voltage fault level of the single battery;
sequencing the temperature fault level of the single battery, the voltage fault level of the battery pack, the state of charge fault level of the battery pack and the voltage fault level of the single battery to determine the maximum fault level;
and determining the maximum fault level as a target fault level.
11. A battery charge/discharge control device, comprising:
the parameter acquisition module is used for acquiring the state parameters of each battery monomer in the battery pack;
the state analysis module is used for analyzing the state parameters of the single batteries and determining the temperature limit value of the single batteries, the total voltage of the battery pack, the charge state of the battery pack and the battery fault state;
and the control module is used for controlling the charging power and the discharging power of the battery based on the temperature limit value of the single battery, the total voltage of the battery pack, the charge state of the battery pack and the fault state of the battery.
12. An electric vehicle, comprising:
a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the method for controlling charging and discharging of the battery according to any one of claims 1 to 10.
13. A computer-readable storage medium storing computer instructions for causing a computer to execute the method for controlling charge and discharge of a battery according to any one of claims 1 to 10.
CN202210988687.9A 2022-08-17 2022-08-17 Control method and device for battery charging and discharging, electric vehicle and readable storage medium Pending CN115276175A (en)

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CN116885320A (en) * 2023-09-08 2023-10-13 宁德时代新能源科技股份有限公司 Battery power output method, device, equipment, medium and product
CN117559010A (en) * 2023-11-16 2024-02-13 浙江启辰新能科技有限公司 Power control device and method of energy storage system, storage medium and energy storage system
CN118099479A (en) * 2024-04-29 2024-05-28 中科嘉鸿(佛山市)新能源科技有限公司 Start-stop method based on high-temperature methanol fuel cell stack
CN118651119A (en) * 2024-08-19 2024-09-17 福建百城新能源科技有限公司 Electric automobile overcharge system and control method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116885320A (en) * 2023-09-08 2023-10-13 宁德时代新能源科技股份有限公司 Battery power output method, device, equipment, medium and product
CN116885320B (en) * 2023-09-08 2024-03-15 宁德时代新能源科技股份有限公司 Battery power output method, device, equipment and medium
CN117559010A (en) * 2023-11-16 2024-02-13 浙江启辰新能科技有限公司 Power control device and method of energy storage system, storage medium and energy storage system
CN117559010B (en) * 2023-11-16 2024-08-06 浙江启辰新能科技有限公司 Power control device and method of energy storage system, storage medium and energy storage system
CN118099479A (en) * 2024-04-29 2024-05-28 中科嘉鸿(佛山市)新能源科技有限公司 Start-stop method based on high-temperature methanol fuel cell stack
CN118099479B (en) * 2024-04-29 2024-08-23 中科嘉鸿(佛山市)新能源科技有限公司 Start-stop method based on high-temperature methanol fuel cell stack
CN118651119A (en) * 2024-08-19 2024-09-17 福建百城新能源科技有限公司 Electric automobile overcharge system and control method

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