CN116540115B - Battery energy state monitoring method and battery system - Google Patents
Battery energy state monitoring method and battery system Download PDFInfo
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- CN116540115B CN116540115B CN202310793447.8A CN202310793447A CN116540115B CN 116540115 B CN116540115 B CN 116540115B CN 202310793447 A CN202310793447 A CN 202310793447A CN 116540115 B CN116540115 B CN 116540115B
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- 238000000034 method Methods 0.000 title claims abstract description 115
- 238000012544 monitoring process Methods 0.000 title claims abstract description 23
- 238000007599 discharging Methods 0.000 claims abstract description 92
- 230000008569 process Effects 0.000 claims abstract description 71
- 238000001514 detection method Methods 0.000 description 10
- 238000004590 computer program Methods 0.000 description 7
- 230000010354 integration Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
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- 238000004146 energy storage Methods 0.000 description 1
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- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- 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]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- H—ELECTRICITY
- 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
-
- 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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/005—Detection of state of health [SOH]
-
- 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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
Abstract
The application relates to a battery energy state monitoring method and a battery system. The method includes obtaining a first initial energy state of the battery corresponding to a charging process; acquiring a second initial energy state of the battery corresponding to a discharging process; acquiring an initial energy state estimation value of the battery according to the first initial energy state and the second initial energy state; if the working state of the battery system is a charging state, acquiring a current time charging current value and a current time charging voltage value of the battery, and acquiring a current charging energy state real-time value of the battery according to the internal resistance value, the current time charging current value, the current time charging voltage value, the first initial energy state and the rated energy of the battery; and if the current charging energy state real-time value is greater than or equal to the initial energy state estimated value, taking the current charging energy state real-time value as the current energy state real-time value of the battery. The application has the advantages of short time consumption, high efficiency and high accuracy.
Description
Technical Field
The present application relates to the field of battery technologies, and in particular, to a battery energy state monitoring method and a battery system.
Background
Along with the national confirmation of the carbon-to-carbon neutralization target, new energy development becomes a necessary trend, and the lithium ion battery is widely applied in the fields of electric automobiles, energy storage systems, aerospace, military and the like, so that effective control and management of the battery pack are necessary in order to ensure that the battery pack always works in a good state and prolong the cycle service life of the battery pack as much as possible.
The battery management system (Battery Management System, BMS) is mainly configured to ensure that the battery operates within a proper parameter range, and after processing the collected information such as the voltage, the temperature, the current, etc. of the battery, perform functions such as Charge and discharge management, equalization control, thermal management and control, battery information display, and fault diagnosis and processing of the battery, and in addition, estimate the State of Charge (SOC), state of Health (SOH), state of peak Power (SOP), and State of Energy (SOE) of the battery in real time.
The State of battery Energy (SOE) reflects the relationship between the remaining battery Energy and the total Energy, usually expressed in percentages. For example, in the field of new energy electric vehicles, the corresponding relation exists between the remaining energy of the battery and the endurance mileage, and the accurate battery energy state estimation can improve the reliability of the battery remaining energy prediction, so as to accurately predict the endurance mileage of the electric vehicle. In the whole vehicle control, the battery energy state can provide basis for whole vehicle energy optimization, the battery energy is reasonably distributed, the output power of the motor is optimally matched, the battery energy utilization rate is improved, the power performance of the whole vehicle is met, and the endurance mileage is prolonged. However, currently, open circuit voltage methods or watt-hour integration methods for estimating the battery energy state are used, which are either time consuming or not capable of accurately calculating the battery energy state.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a battery energy state monitoring method and a battery system that can take a short time and have high accuracy.
A battery energy state monitoring method, the method comprising the steps of:
acquiring a first voltage-energy state curve of a battery charging process, a second voltage-energy state curve of a battery discharging process and an internal resistance value of the battery;
when a battery system starts to work, collecting an initial voltage value of a battery;
acquiring a first initial energy state of the battery corresponding to a charging process based on the first voltage-energy state curve and the initial voltage value;
acquiring a second initial energy state of the battery corresponding to a discharging process based on the second voltage-energy state curve and the initial voltage value;
acquiring an initial energy state estimation value of the battery according to the first initial energy state and the second initial energy state;
if the working state of the battery system is a charging state, acquiring a current time charging current value and a current time charging voltage value of the battery, and acquiring a current charging energy state real-time value of the battery according to the internal resistance value, the current time charging current value, the current time charging voltage value, the first initial energy state and the rated energy of the battery;
If the current charging energy state real-time value is greater than or equal to the initial energy state estimated value, the current charging energy state real-time value is used as the current energy state real-time value of the battery;
if the current charging energy state real-time value is smaller than the initial energy state estimated value, updating the first initial energy state into the current charging energy state real-time value, and acquiring the next charging energy state real-time value of the battery according to the internal resistance value, the next charging current value, the next charging voltage value, the updated first initial energy state and the rated energy of the battery until the next charging energy state real-time value is larger than or equal to the updated initial energy state estimated value.
In one embodiment, the method further comprises the steps of:
if the working state of the battery system is a discharging state, acquiring a current discharging current value and a current discharging voltage value of the battery, and acquiring a real-time value of the current discharging energy state of the battery according to the internal resistance value, the current discharging current value, the current discharging voltage value, the second initial energy state and the rated energy of the battery;
and if the current discharge energy state real-time value is smaller than or equal to the initial energy state estimated value, taking the current discharge energy state real-time value as the current energy state real-time value of the battery.
In one embodiment, the method further comprises the steps of:
if the current discharge energy state real-time value is larger than the initial energy state estimated value, updating the second initial energy state to the current discharge energy state real-time value, and acquiring the next discharge energy state real-time value of the battery according to the internal resistance value, the next discharge current value, the next discharge voltage value, the updated second initial energy state and the rated energy of the battery until the next discharge energy state real-time value is smaller than or equal to the updated initial energy state estimated value.
In one embodiment, in the step of acquiring the first voltage-energy state curve of the battery charging process, the second voltage-energy state curve of the battery discharging process, and the internal resistance value of the battery, the internal resistance value is acquired based on the following steps:
controlling the battery to be discharged, and controlling the battery to be fully charged after the battery is discharged;
controlling the energy of the fully charged battery to discharge the preset proportion according to the preset multiplying power, and standing for a preset time;
circularly controlling the battery after standing to discharge and charge according to a preset multiplying power, and standing for a preset time between the discharging process and the charging process until the energy state of the battery is smaller than the preset ending energy;
Collecting a discharge average current value, a charge average current value, a voltage value before discharge, a voltage value after discharge, a voltage value before charge and a voltage value after charge in the process of cyclic discharge and charge of the battery;
obtaining a discharge internal resistance value of the battery according to the discharge average current value, the voltage value before discharge and the voltage value after discharge;
acquiring a charging internal resistance value of the battery according to the charging average current value, the pre-charging voltage value and the post-charging voltage value;
and obtaining an average value of the discharge internal resistance value and the charge internal resistance value, and taking the average value as the internal resistance value.
In one embodiment, in the step of acquiring a first voltage-energy state curve of a battery charging process, a second voltage-energy state curve of a battery discharging process, and an internal resistance value of the battery, the first voltage-energy state curve is acquired based on the following steps:
controlling the battery to discharge;
controlling the battery to charge the energy of a preset proportion according to a preset charging multiplying power;
controlling the charged battery to stand for preset standing time, and collecting the first current voltage and the first current residual energy of the battery after the battery is subjected to standing for the preset standing time;
acquiring a first current energy state of the battery according to the first current residual energy;
The battery is controlled to be charged with energy in a preset proportion according to a preset charging rate in sequence until the battery is fully charged, and a plurality of groups of first current voltage and first current energy states are obtained;
and fitting a plurality of groups of first current time voltages and first current time energy states to obtain a first voltage-energy state curve.
In one embodiment, in the step of acquiring a first voltage-energy state curve of a battery charging process, a second voltage-energy state curve of a battery discharging process, and an internal resistance value of the battery, the second voltage-energy state curve is acquired based on the steps of:
controlling the battery to be fully charged;
controlling the battery to discharge the energy of a preset proportion according to a preset discharge multiplying power;
controlling the discharged battery to stand for a preset standing time, and collecting the second current voltage and the second current residual energy of the battery after the battery is subjected to standing for the preset standing time;
acquiring a second current energy state of the battery according to the second current residual energy;
the battery is controlled to discharge energy in a preset proportion according to a preset discharge rate in sequence until the cut-off voltage of the battery is reached, and a plurality of groups of second current voltage and second current energy states are obtained;
and fitting a plurality of groups of second current voltage and second current energy state to obtain a second voltage-energy state curve.
In one embodiment, if the working state of the battery system is a charging state, the current time charging current value and the current time charging voltage value of the battery are obtained, and the current charging energy state real-time value of the battery is obtained according to the internal resistance value, the current time charging current value, the current time charging voltage value, the first initial energy state and the rated energy of the battery, in the step of obtaining the current charging energy state real-time value of the battery, according to the following formula:
wherein ,representing a current charge energy status real-time value; />Representing a first initial energy state;ending the time point; />Indicating a charging start time point; />Representing a time point; />Representing a present charging current; />Representing a current charging voltage; />Representing the internal resistance value; />Indicating the rated energy of the battery.
In one embodiment, if the working state of the battery system is a discharging state, the current discharging current value and the current discharging voltage value of the battery are obtained, and in the step of obtaining the current discharging energy state real-time value of the battery according to the internal resistance value, the current discharging current value, the current discharging voltage value, the second initial energy state and the rated energy of the battery, the current discharging energy state real-time value is obtained according to the following formula:
wherein ,representing a current discharge energy state real-time value; />Representing a second initial energy state; />Indicating a discharge end time point; />Indicating a discharge start time point; />Representing a time point; />Representing the present discharge current; />Representing a current discharge voltage; />Representing the internal resistance value; />Indicating the rated energy of the battery.
A battery system comprises a battery management module, a battery and a charging and discharging module; the battery management module is respectively and electrically connected with the battery and the charge-discharge module; the charge-discharge module is electrically connected with the battery; the battery management module is used for realizing the following steps:
acquiring a first voltage-energy state curve of a battery charging process, a second voltage-energy state curve of a battery discharging process and an internal resistance value of the battery;
when a battery system starts to work, collecting an initial voltage value of a battery;
acquiring a first initial energy state of the battery corresponding to a charging process based on the first voltage-energy state curve and the initial voltage value;
acquiring a second initial energy state of the battery corresponding to a discharging process based on the second voltage-energy state curve and the initial voltage value;
acquiring an initial energy state estimation value of the battery according to the first initial energy state and the second initial energy state;
If the working state of the battery system is a charging state, acquiring a current time charging current value and a current time charging voltage value of the battery, and acquiring a current charging energy state real-time value of the battery according to the internal resistance value, the current time charging current value, the current time charging voltage value, the first initial energy state and the rated energy of the battery;
if the current charging energy state real-time value is greater than or equal to the initial energy state estimated value, the current charging energy state real-time value is used as the current energy state real-time value of the battery;
and if the current charging energy state real-time value is smaller than the initial energy state estimated value, updating the first initial energy state into the current charging energy state real-time value, and acquiring the next charging energy state real-time value of the battery according to the internal resistance value, the next charging current value, the next charging voltage value, the updated first initial energy state and the rated energy of the battery until the next charging energy state real-time value is larger than or equal to the updated initial energy state estimated value.
One of the above technical solutions has the following advantages and beneficial effects:
According to the battery energy state detection method provided by the embodiments of the application, when a battery system starts to work when being electrified, an initial voltage value of the battery is acquired, a first initial energy state of the battery corresponding to a charging process is acquired based on a first voltage-energy state curve and the initial voltage value, a second initial energy state of the battery corresponding to a discharging process is acquired based on a second voltage-energy state curve and the initial voltage value, then an initial energy state estimated value of the battery is acquired according to the first initial energy state and the second initial energy state, and the first initial energy state is used as an initial value of the energy state in the battery charging process. And if the working state of the battery system is a charging state, acquiring a current time charging current value and a current time charging voltage value of the battery, and acquiring a current charging energy state real-time value of the battery according to the internal resistance value, the current time charging current value, the current time charging voltage value, the first initial energy state and the rated energy of the battery. And if the current charging energy state real-time value is greater than or equal to the initial energy state estimated value, taking the current charging energy state real-time value as the current energy state real-time value of the battery. The application solves the problem that the traditional open-circuit voltage method needs to stand for a plurality of times for a long time to cause long detection time consumption, solves the problem that the traditional open-circuit voltage method cannot detect the energy state of the battery in real time, takes the initial energy state as the initial value of the energy state detection, and avoids the problem that the traditional watt-hour integration method cannot accurately detect the energy state because the initial value cannot be accurately obtained.
Drawings
Fig. 1 is a schematic flow chart of a method for monitoring a battery energy state according to an embodiment of the application.
Fig. 2 is a flowchart illustrating a step of obtaining an internal resistance value according to an embodiment of the present application.
Fig. 3 is a flowchart illustrating a step of acquiring a first voltage-energy state curve according to an embodiment of the present application.
Fig. 4 is a flowchart illustrating a step of obtaining a second voltage-energy state curve according to an embodiment of the application.
Fig. 5 is a schematic flow chart of another method for monitoring a battery energy state according to an embodiment of the application.
Fig. 6 is a schematic flow chart of a battery energy state monitoring method according to an embodiment of the application.
Fig. 7 is an internal structural diagram of a computer device in an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
In order to solve the problem that the open circuit voltage method or the watt-hour integration method for estimating the energy state of the battery is adopted at present, which is either long in time or cannot accurately calculate the energy state of the battery, in one embodiment, as shown in fig. 1, a method for monitoring the energy state of the battery is provided, which comprises the following steps:
Step S110, a first voltage-energy state curve of the battery charging process, a second voltage-energy state curve of the battery discharging process, and an internal resistance value of the battery are obtained.
The internal resistance value of a battery refers to the resistance that the battery receives when operating with current flowing through the battery. In one example, the internal resistance value of the battery may be stored in a storage medium of the battery management module in advance. In another example, the internal resistance value of the battery may be sent to the battery management module by an external device (e.g., an external computer device) before the method of the present application is run.
In one example, as shown in fig. 2, in the step of acquiring a first voltage-energy state curve of a battery charging process, a second voltage-energy state curve of a battery discharging process, and an internal resistance value of a battery, the internal resistance value is acquired based on the following steps:
and step S210, controlling the battery to be discharged, and controlling the battery after the battery is discharged to be fully charged. The discharging refers to discharging the battery to a cut-off voltage. Fully charged means that the battery is charged to 100%.
Step S220, discharging the fully charged battery according to a preset ratio, and standing for a preset time. The preset multiplying power can be determined according to actual requirements, for example, the preset multiplying power is one multiplying power, 1.5 multiplying power or 2 multiplying power. The preset proportion of energy can be determined according to actual requirements, for example, the preset proportion of energy is 10%, 15% or 20% of rated energy, etc.
Step S230, circularly controlling the battery after standing to discharge and charge according to a preset multiplying power, and standing for a preset time between the discharging process and the charging process until the energy state of the battery is smaller than the preset ending energy. In other words, the battery is controlled to discharge once, kept stand for a preset time, charged once, kept stand for a preset time, and circulated.
Step S240, collecting a discharge average current value, a charge average current value, a pre-discharge voltage value, a post-discharge voltage value, a pre-charge voltage value and a post-charge voltage value in the battery cyclic discharge and charge process.
Step S250, obtaining the discharge internal resistance value of the battery according to the discharge average current value, the voltage value before discharge and the voltage value after discharge.
In one example, the discharge internal resistance value is obtained based on the following formula:
wherein ,representing the discharge internal resistance value.
Step S260, obtaining the internal resistance value of the battery according to the average charging current value, the voltage value before charging and the voltage value after charging.
In one example, the internal charge resistance value is obtained based on the following formula:
wherein ,representing the value of the internal resistance of charge.
Obtaining total internal resistance based on the following formula）：
wherein ,indicating the total internal resistance.
Step S270, an average value of the discharge internal resistance value and the charge internal resistance value is obtained, and the average value is taken as the internal resistance value.
The first voltage-energy state curve may be a curve with voltage as an abscissa and energy state as an ordinate, and the second voltage-energy state curve may be a curve with voltage as an abscissa and energy state as an ordinate. Of course, the first voltage-energy state curve may be a curve with voltage on the ordinate and energy state on the abscissa, and the second voltage-energy state curve may be a curve with voltage on the ordinate and energy state on the abscissa. The first voltage-energy state curve is a curve drawn based on a charging process of the battery, and the second voltage-energy state curve is a curve drawn based on a discharging process of the battery. In one example, the first voltage-energy state curve and the second voltage-energy state curve may be pre-stored in a storage medium of the battery management module. In another example, the first voltage-energy state curve and the second voltage-energy state curve may also be sent by an external device (e.g., an external computer device) to the battery management module before the method of the present application operates.
In one example, as shown in fig. 3, in the step of acquiring a first voltage-energy state curve of a battery charging process, a second voltage-energy state curve of a battery discharging process, and an internal resistance value of a battery, the first voltage-energy state curve is acquired based on the following steps:
Step S310, controlling the battery to discharge. The discharging refers to discharging the battery to a cut-off voltage.
Step S320, controlling the battery to charge the energy of the preset proportion according to the preset charging multiplying power. The preset charging rate may be determined according to actual requirements, for example, the preset charging rate is one-time rate, 1.5-time rate or 2-time rate. The preset proportion of energy can be determined according to actual requirements, for example, the preset proportion of energy is 10%, 15% or 20% of rated energy, etc.
Step S330, the charged battery is controlled to stand for a preset standing time, and after the preset standing time is kept, the first current voltage and the first current residual energy of the battery are collected. The preset rest time is for stabilizing the voltage and remaining energy of the battery, and may be according to actual demands, for example, 1 hour, 1.5 hours, or 2 hours. And collecting the first current voltage and the first current residual energy at the time when the battery is kept still for a preset standing time. In one example, the first current remaining capacity is determined by accumulating the charged preset proportional energy.
Step S340, obtaining the first current energy state of the battery according to the first current remaining energy.
In one example, the first current energy state is obtained based on the following formula:
×100%
wherein ,representing the first current energy state. />Is the maximum energy that the battery can store.
Step S350, the battery is controlled to be charged with energy in a preset proportion according to a preset charging rate in sequence until the battery is fully charged, and a plurality of groups of first current voltage and first current energy states are obtained. And repeating the charging and standing processes for a plurality of times, wherein each charging is performed by charging the energy of a preset proportion according to a preset charging multiplying power. A plurality of sets of first current sub-voltages and first current sub-energy states of the corresponding relationship are obtained.
In step S360, a plurality of sets of the first current time voltage and the first current time energy state are fitted to obtain a first voltage-energy state curve.
In one example, as shown in fig. 4, in the step of acquiring a first voltage-energy state curve of a battery charging process, a second voltage-energy state curve of a battery discharging process, and an internal resistance value of the battery, the second voltage-energy state curve is acquired based on the following steps:
in step S410, the battery is controlled to be fully charged. Fully charged means that the battery is charged to 100%.
Step S420, the battery is controlled to discharge the energy of the preset proportion according to the preset discharge multiplying power. The preset discharge rate may be determined according to actual requirements, for example, the preset discharge rate is a double rate. The preset proportion of energy can be determined according to actual requirements, for example, the preset proportion of energy is 10%, 15% or 20% of rated energy, etc.
And S430, controlling the discharged battery to stand for a preset standing time, and collecting the second current voltage and the second current residual energy of the battery after the preset standing time. The preset rest time is for stabilizing the voltage and remaining energy of the battery, and may be according to actual demands, for example, 1 hour, 1.5 hours, or 2 hours. And collecting the second current voltage and the second current residual energy at the time when the battery is kept still for a preset standing time. In one example, the second current remaining capacity is determined by the difference between the rated capacity and the accumulated released preset proportional energy.
Step S440, obtaining the second current energy state of the battery according to the second current residual energy.
In one example, the first current energy state is obtained based on the following formula:
×100%
wherein ,representing the second current energy state. />Is the maximum energy that the battery can store.
And S450, controlling the battery to discharge the energy in a preset proportion according to a preset discharge rate in sequence until the cut-off voltage of the battery is reached, and obtaining a plurality of groups of second current voltage and second current energy state. Repeating the discharging and standing processes for a plurality of times, wherein each discharging discharges the energy of a preset proportion according to a preset discharging multiplying power. And obtaining a plurality of groups of second current time voltages and second current charge states of the corresponding relations.
Step S460, fitting a plurality of groups of second current voltage and second current energy state to obtain a second voltage-energy state curve.
Step S120, when the battery system starts to operate, the initial voltage value of the battery is collected. The battery system starts working when being electrified, and the voltage value of the battery at the time of electrification is acquired, namely the initial voltage value. In other words, the battery system starts to operate as a starting point for detecting the state of charge of the battery.
Step S130, based on the first voltage-energy state curve and the initial voltage value, obtains a first initial energy state of the battery corresponding to the charging process. Substituting the initial voltage value into the first voltage-energy state curve may correspond to obtaining a first initial energy state.
Step S140, based on the second voltage-energy state curve and the initial voltage value, obtains a second initial energy state of the battery corresponding to the discharging process. Substituting the initial voltage value into the second voltage-energy state curve may correspond to obtaining a second initial energy state.
Step S150, obtaining an initial energy state estimation value of the battery according to the first initial energy state and the second initial energy state. The initial energy state estimate is the energy state estimated based on the method of the present application. In one example, a sum of the first initial energy state and the second initial energy state is obtained, and one half of the sum is taken as the initial energy state estimate.
Step S160, if the working state of the battery system is a charging state, a current time charging current value and a current time charging voltage value of the battery are obtained, and a current charging energy state real-time value of the battery is obtained according to the internal resistance value, the current time charging current value, the current time charging voltage value, the first initial energy state and the rated energy of the battery.
The battery system starts to work when being electrified, and the working state of the work when the electrification starts is a charging state. And collecting the current time charging current value and the current time charging voltage value of the battery in real time from the starting working time as the basis for obtaining the current charging energy state real-time value of the battery, and detecting the energy state of the battery in real time.
After the current time charging current value and the current time charging voltage value are obtained, a current charging energy state real-time value of the battery is obtained according to the internal resistance value, the current time charging current value, the current time charging voltage value, the first initial energy state and rated energy of the battery. In one example, if the operating state of the battery system is a charging state, the current time charging current value and the current time charging voltage value of the battery are obtained, and the current charging energy state real-time value of the battery is obtained according to the internal resistance value, the current time charging current value, the current time charging voltage value, the first initial energy state and the rated energy of the battery, in the step of obtaining the current charging energy state real-time value of the battery, according to the following formula:
wherein ,representing a current charge energy status real-time value; />Representing a first initial energy state;ending the time point; />Indicating a charging start time point; />Representing a time point; />Representing a present charging current; />Representing a current charging voltage; />Representing the internal resistance value; />Indicating the rated energy of the battery.
In step S170, if the current charging energy status real value is greater than or equal to the initial energy status estimated value, the current charging energy status real value is used as the current energy status real value of the battery. After the current charging energy state real-time value is obtained, the current charging energy state real-time value is compared with the initial energy state estimated value, and when the current charging energy state real-time value is larger than or equal to the initial energy state estimated value, the current charging energy state real-time value is used as the current energy state real-time value of the battery. As shown in fig. 5, the battery energy state monitoring method further includes step S580: if the current charging energy state real-time value is smaller than the initial energy state estimated value, updating the first initial energy state into the current charging energy state real-time value, and acquiring the next charging energy state real-time value of the battery according to the internal resistance value, the next charging current value, the next charging voltage value, the updated first initial energy state and the rated energy of the battery until the next charging energy state real-time value is larger than or equal to the initial energy state estimated value. In other words, when the current charge energy state real-time value is smaller than the initial energy state estimated value, the current charge energy state real-time value is taken as the first initial energy state, the charge energy state real-time value is recalculated, the next charge energy state real-time value is obtained, and when the next charge energy state real-time value is larger than or equal to the initial energy state estimated value, the next charge energy state real-time value is taken as the current energy state real-time value of the battery. If the next charging energy state real-time value is still smaller than the initial energy state estimated value, the next charging energy state real-time value is taken as the first initial energy state, and the charging energy state real-time value is recalculated.
When the real-time value of the charging energy state is smaller than the estimated value of the initial energy state, the first initial energy state is updated, namely the detection starting point of the energy state is updated, the initial value of the calculated energy state is corrected, error accumulation is avoided, and the accuracy of energy state detection is improved.
In one embodiment, as shown in fig. 6, the battery energy state monitoring method further includes the steps of:
step S690, if the working state of the battery system is a discharging state, obtaining a current discharging current value and a current discharging voltage value of the battery, and obtaining a real-time value of the current discharging energy state of the battery according to the internal resistance value, the current discharging current value, the current discharging voltage value, the second initial energy state and the rated energy of the battery.
The battery system starts to work when being electrified, and the working state of the work when the electrification starts is a discharging state. The method comprises the steps of collecting a current discharging current value and a current discharging voltage value of a battery in real time from a starting working time as a basis for obtaining a current discharging state real-time value of the battery, and detecting the energy state of the battery in real time.
After the current discharge current value and the current discharge voltage value are obtained, a real-time value of the current charge energy state of the battery is obtained according to the internal resistance value, the current discharge current value, the current discharge voltage value, the second initial energy state and the rated energy of the battery. In one example, if the working state of the battery system is a discharging state, a current discharging current value and a current discharging voltage value of the battery are obtained, and in the step of obtaining a current discharging energy state real-time value of the battery according to the internal resistance value, the current discharging current value, the current discharging voltage value, the second initial energy state and the rated energy of the battery, the current discharging energy state real-time value is obtained according to the following formula:
wherein ,representing a current discharge energy state real-time value; />Representing a second initial energy state; />Indicating a discharge end time point; />Indicating a discharge start time point; />Representing a time point; />Representing the present discharge current; />Representing a current discharge voltage; />Representing the internal resistance value; />Indicating the rated energy of the battery.
In step S600, if the current discharge energy state real value is less than or equal to the initial energy state estimated value, the current discharge energy state real value is used as the current energy state real value of the battery. And after the current charge state real-time value is obtained, the current charge state real-time value and the initial charge state estimated value are used, and when the current charge state real-time value is smaller than or equal to the initial charge state estimated value, the current charge state real-time value is used as the current charge state real-time value of the battery. As shown in fig. 6, the battery energy state monitoring method further includes step S601: if the current discharge energy state real-time value is larger than the initial energy state estimated value, updating the second initial energy state to the current discharge energy state real-time value, and acquiring the next discharge energy state real-time value of the battery according to the internal resistance value, the next discharge current value, the next discharge voltage value, the updated second initial energy state and the rated energy of the battery until the next discharge energy state real-time value is smaller than or equal to the initial energy state estimated value. In other words, when the current real-time value of the discharging energy state is larger than the initial energy state estimated value, the current real-time value of the discharging energy state is taken as the second initial energy state, the discharging energy state real-time value is recalculated, the next discharging energy state real-time value is obtained, and when the next discharging energy state real-time value is smaller than or equal to the more initial energy state estimated value, the next discharging energy state real-time value is taken as the current energy state real value of the battery. If the real-time value of the next discharging energy state is still larger than the estimated value of the initial energy state, the real-time value of the next discharging energy state is taken as a second initial energy state, and the real-time value of the discharging energy state is recalculated.
When the real-time value of the discharge energy state is larger than the estimated value of the initial energy state, updating the second initial energy state, namely updating the detection starting point of the energy state, correcting the initial value of the calculated energy state, avoiding error accumulation and improving the accuracy of energy state detection.
According to the battery energy state detection method provided by the embodiments of the application, when a battery system starts to work when being electrified, an initial voltage value of the battery is acquired, a first initial energy state of the battery corresponding to a charging process is acquired based on a first voltage-energy state curve and the initial voltage value, a second initial energy state of the battery corresponding to a discharging process is acquired based on a second voltage-energy state curve and the initial voltage value, then an initial energy state estimated value of the battery is acquired according to the first initial energy state and the second initial energy state, and the first initial energy state is used as an initial value of the energy state in the battery charging process. And if the working state of the battery system is a charging state, acquiring a current time charging current value and a current time charging voltage value of the battery, and acquiring a current charging energy state real-time value of the battery according to the internal resistance value, the current time charging current value, the current time charging voltage value, the first initial energy state and the rated energy of the battery. And if the current charging energy state real-time value is greater than or equal to the initial energy state estimated value, taking the current charging energy state real-time value as the current energy state real-time value of the battery. The application solves the problem that the traditional open-circuit voltage method needs to stand for a plurality of times for a long time to cause long detection time consumption, solves the problem that the traditional open-circuit voltage method cannot detect the energy state of the battery in real time, takes the initial energy state as the initial value of the energy state detection, and avoids the problem that the traditional watt-hour integration method cannot accurately detect the energy state because the initial value cannot be accurately obtained.
It should be understood that, although the steps in the flowcharts of fig. 1-6 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 1-6 may include multiple sub-steps or phases that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the sub-steps or phases are performed necessarily occur sequentially, but may be performed alternately or alternately with at least a portion of the sub-steps or phases of other steps or other steps.
In one embodiment, a battery system includes a battery management module, a battery, and a charge-discharge module; the battery management module is respectively and electrically connected with the battery and the charge-discharge module; the charge-discharge module is electrically connected with the battery. The battery management module is used for ensuring that the battery works in a proper parameter range, and after the collected information such as the battery voltage, the temperature, the current and the like is processed, the functions of charge and discharge management, balance control, heat management and control, battery information display, fault diagnosis and processing and the like of the battery pack are completed, and the state of charge, the state of health, the state of discharge peak power and the state of energy of the battery pack can be estimated in real time. The battery is used for storing and discharging electricity, and is formed by connecting a plurality of battery units in parallel or in series. The charging and discharging module is used for controlling the discharging or charging of the battery.
The battery management module is used for realizing the following steps:
acquiring a first voltage-energy state curve of a battery charging process, a second voltage-energy state curve of a battery discharging process and an internal resistance value of the battery;
when a battery system starts to work, collecting an initial voltage value of a battery;
acquiring a first initial energy state of the battery corresponding to a charging process based on the first voltage-energy state curve and the initial voltage value;
acquiring a second initial energy state of the battery corresponding to a discharging process based on the second voltage-energy state curve and the initial voltage value;
acquiring an initial energy state estimation value of the battery according to the first initial energy state and the second initial energy state;
if the working state of the battery system is a charging state, acquiring a current time charging current value and a current time charging voltage value of the battery, and acquiring a current charging energy state real-time value of the battery according to the internal resistance value, the current time charging current value, the current time charging voltage value, the first initial energy state and the rated energy of the battery;
and if the current charging energy state real-time value is greater than or equal to the initial energy state estimated value, taking the current charging energy state real-time value as the current energy state real-time value of the battery.
It should be noted that the battery management module is also used for other steps of the battery state of charge monitoring method of the present application.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure of which may be as shown in fig. 7. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a battery energy state monitoring method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in FIG. 7 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor when executing the computer program performing the steps of:
acquiring a first voltage-energy state curve of a battery charging process, a second voltage-energy state curve of a battery discharging process and an internal resistance value of the battery;
when a battery system starts to work, collecting an initial voltage value of a battery;
acquiring a first initial energy state of the battery corresponding to a charging process based on the first voltage-energy state curve and the initial voltage value;
acquiring a second initial energy state of the battery corresponding to a discharging process based on the second voltage-energy state curve and the initial voltage value;
acquiring an initial energy state estimation value of the battery according to the first initial energy state and the second initial energy state;
If the working state of the battery system is a charging state, acquiring a current time charging current value and a current time charging voltage value of the battery, and acquiring a current charging energy state real-time value of the battery according to the internal resistance value, the current time charging current value, the current time charging voltage value, the first initial energy state and the rated energy of the battery;
and if the current charging energy state real-time value is greater than or equal to the initial energy state estimated value, taking the current charging energy state real-time value as the current energy state real-time value of the battery.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring a first voltage-energy state curve of a battery charging process, a second voltage-energy state curve of a battery discharging process and an internal resistance value of the battery;
when a battery system starts to work, collecting an initial voltage value of a battery;
acquiring a first initial energy state of the battery corresponding to a charging process based on the first voltage-energy state curve and the initial voltage value;
acquiring a second initial energy state of the battery corresponding to a discharging process based on the second voltage-energy state curve and the initial voltage value;
Acquiring an initial energy state estimation value of the battery according to the first initial energy state and the second initial energy state;
if the working state of the battery system is a charging state, acquiring a current time charging current value and a current time charging voltage value of the battery, and acquiring a current charging energy state real-time value of the battery according to the internal resistance value, the current time charging current value, the current time charging voltage value, the first initial energy state and the rated energy of the battery;
if the current charging energy state real-time value is greater than or equal to the initial energy state estimated value, the current charging energy state real-time value is used as the current energy state real-time value of the battery;
and if the current charging energy state real-time value is smaller than the initial energy state estimated value, updating the first initial energy state into the current charging energy state real-time value, and acquiring the next charging energy state real-time value of the battery according to the internal resistance value, the next charging current value, the next charging voltage value, the updated first initial energy state and the rated energy of the battery until the next charging energy state real-time value is larger than or equal to the updated initial energy state estimated value.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (9)
1. A method of monitoring battery energy status, the method comprising the steps of:
acquiring a first voltage-energy state curve of a battery charging process, a second voltage-energy state curve of a battery discharging process and an internal resistance value of the battery;
when a battery system starts to work, collecting an initial voltage value of a battery;
acquiring a first initial energy state of the battery corresponding to a charging process based on the first voltage-energy state curve and the initial voltage value;
Acquiring a second initial energy state of the battery corresponding to a discharging process based on the second voltage-energy state curve and the initial voltage value;
acquiring an initial energy state estimation value of the battery according to the first initial energy state and the second initial energy state;
if the working state of the battery system is a charging state, acquiring a current time charging current value and a current time charging voltage value of the battery, and acquiring a current charging energy state real-time value of the battery according to the internal resistance value, the current time charging current value, the current time charging voltage value, the first initial energy state and rated energy of the battery;
if the current charging energy state real-time value is greater than or equal to the initial energy state estimated value, the current charging energy state real-time value is used as the current energy state real-time value of the battery;
and if the current charging energy state real-time value is smaller than the initial energy state estimated value, updating the first initial energy state into the current charging energy state real-time value, and acquiring the next charging energy state real-time value of the battery according to the internal resistance value, the next charging current value, the next charging voltage value, the updated first initial energy state and the rated energy of the battery until the next charging energy state real-time value is larger than or equal to the updated initial energy state estimated value.
2. The battery energy status monitoring method of claim 1, further comprising the steps of:
if the working state of the battery system is a discharging state, acquiring a current discharging current value and a current discharging voltage value of the battery, and acquiring a current discharging energy state real-time value of the battery according to the internal resistance value, the current discharging current value, the current discharging voltage value, the second initial energy state and the rated energy of the battery;
and if the current discharge energy state real-time value is smaller than or equal to the initial energy state estimated value, taking the current discharge energy state real-time value as the current energy state real-time value of the battery.
3. The battery energy status monitoring method of claim 2, further comprising the steps of:
and if the current discharge energy state real-time value is larger than the initial energy state estimated value, updating the second initial energy state to the current discharge energy state real-time value, and acquiring the next discharge energy state real-time value of the battery according to the internal resistance value, the next discharge current value, the next discharge voltage value, the updated second initial energy state and the rated energy of the battery until the next discharge energy state real-time value is smaller than or equal to the updated initial energy state estimated value.
4. The battery energy state monitoring method according to claim 1, wherein in the step of acquiring a first voltage-energy state curve of a battery charging process, a second voltage-energy state curve of a battery discharging process, and an internal resistance value of the battery, the internal resistance value is acquired based on the steps of:
controlling the battery to be discharged, and controlling the battery to be fully charged after the battery is discharged;
controlling the energy of the fully charged battery in a preset proportion according to a preset multiplying power, and standing for a preset time;
circularly controlling the battery after standing to discharge and charge according to the preset multiplying power, and standing for the preset time between the discharging process and the charging process until the energy state of the battery is smaller than the preset ending energy;
collecting a discharge average current value, a charge average current value, a voltage value before discharge, a voltage value after discharge, a voltage value before charge and a voltage value after charge in the process of circularly discharging and charging the battery;
acquiring a discharge internal resistance value of the battery according to the discharge average current value, the pre-discharge voltage value and the post-discharge voltage value;
acquiring a charging internal resistance value of the battery according to the charging average current value, the pre-charging voltage value and the post-charging voltage value;
And obtaining an average value of the discharge internal resistance value and the charge internal resistance value, and taking the average value as the internal resistance value.
5. The battery energy state monitoring method according to claim 1, wherein in the step of acquiring a first voltage-energy state curve of a battery charging process, a second voltage-energy state curve of a battery discharging process, and an internal resistance value of a battery, the first voltage-energy state curve is acquired based on the steps of:
controlling the battery to discharge;
controlling the battery to charge the energy of a preset proportion according to a preset charging multiplying power;
controlling the charged battery to stand for a preset standing time, and collecting a first current voltage and a first current residual energy of the battery after standing for the preset standing time;
acquiring a first current energy state of the battery according to the first current residual energy;
controlling the battery to charge the preset proportion energy according to the preset charging multiplying power in sequence until the battery is fully charged, and obtaining a plurality of groups of first current voltage and first current energy states;
and fitting a plurality of groups of the first current time voltage and the first current time energy state to obtain a first voltage-energy state curve.
6. The battery energy state monitoring method according to claim 1, wherein in the step of acquiring a first voltage-energy state curve of a battery charging process, a second voltage-energy state curve of a battery discharging process, and an internal resistance value of the battery, the second voltage-energy state curve is acquired based on the steps of:
controlling the battery to be fully charged;
controlling the energy of the battery in a preset discharging ratio according to a preset discharging multiplying power;
controlling the discharged battery to stand for a preset standing time, and collecting a second current voltage and a second current residual energy of the battery after standing for the preset standing time;
acquiring a second current energy state of the battery according to the second current residual energy;
controlling the battery to discharge the energy of the preset proportion according to the preset discharge rate in sequence until the cut-off voltage of the battery is reached, and obtaining a plurality of groups of second current voltage and second current energy state;
and fitting a plurality of groups of second current time voltage and second current time energy state to obtain a second voltage-energy state curve.
7. The battery energy state monitoring method according to any one of claims 1 to 6, wherein, if the operating state of the battery system is a charged state, a current time charging current value and a current time charging voltage value of the battery are obtained, and the current charged energy state real value is obtained according to the internal resistance value, the current time charging current value, the current time charging voltage value, the first initial energy state and the rated energy of the battery, in the step of obtaining the current charged energy state real value of the battery, according to the following formula:
wherein ,representing the current charge energy status real-time value; />Representing a first initial energy state;ending the time point; />Indicating a charging start time point; />Representing a time point; />Representing a present charging current; />Representing a current charging voltage; />Representing the internal resistance value; />Indicating the rated energy of the battery.
8. The battery energy state monitoring method according to claim 2 or 3, wherein, if the operating state of the battery system is a discharge state, a current discharge current value and a current discharge voltage value of the battery are obtained, and the current discharge energy state real-time value is obtained according to the internal resistance value, the current discharge current value, the current discharge voltage value, the second initial energy state and the rated energy of the battery, in the step of obtaining the current discharge energy state real-time value of the battery, according to the following formula:
wherein ,representing the current discharge energy state real-time value; />Representing a second initial energy state; />Indicating a discharge end time point; />Indicating a discharge start time point; />Representing a time point; />Representing the present discharge current; />Representing a current discharge voltage; / >Representing the internal resistance value; />Indicating the rated energy of the battery.
9. A battery system, characterized by comprising a battery management module, a battery and a charge-discharge module; the battery management module is respectively and electrically connected with the battery and the charge-discharge module; the charge-discharge module is electrically connected with the battery; the battery management module is used for realizing the following steps:
acquiring a first voltage-energy state curve of a battery charging process, a second voltage-energy state curve of a battery discharging process and an internal resistance value of the battery;
when a battery system starts to work, collecting an initial voltage value of a battery;
acquiring a first initial energy state of the battery corresponding to a charging process based on the first voltage-energy state curve and the initial voltage value;
acquiring a second initial energy state of the battery corresponding to a discharging process based on the second voltage-energy state curve and the initial voltage value;
acquiring an initial energy state estimation value of the battery according to the first initial energy state and the second initial energy state;
if the working state of the battery system is a charging state, acquiring a current time charging current value and a current time charging voltage value of the battery, and acquiring a current charging energy state real-time value of the battery according to the internal resistance value, the current time charging current value, the current time charging voltage value, the first initial energy state and rated energy of the battery;
If the current charging energy state real-time value is greater than or equal to the initial energy state estimated value, the current charging energy state real-time value is used as the current energy state real-time value of the battery;
and if the current charging energy state real-time value is smaller than the initial energy state estimated value, updating the first initial energy state into the current charging energy state real-time value, and acquiring the next charging energy state real-time value of the battery according to the internal resistance value, the next charging current value, the next charging voltage value, the updated first initial energy state and the rated energy of the battery until the next charging energy state real-time value is larger than or equal to the updated initial energy state estimated value.
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