CN112731187A - Battery capacity correction method and battery management system - Google Patents
Battery capacity correction method and battery management system Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000012937 correction Methods 0.000 title claims abstract description 18
- 238000007600 charging Methods 0.000 claims abstract description 109
- 238000007599 discharging Methods 0.000 claims description 14
- 230000036541 health Effects 0.000 claims description 8
- 125000004122 cyclic group Chemical group 0.000 claims description 6
- 238000012986 modification Methods 0.000 claims description 3
- 230000004048 modification Effects 0.000 claims description 3
- 230000006870 function Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 238000010277 constant-current charging Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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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
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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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]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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Abstract
The embodiment of the application provides a battery capacity correction method, which comprises the following steps: acquiring a first capacity corresponding to a first charging curve of the battery and a second capacity corresponding to a second charging curve of the battery according to the first voltage, acquiring a third capacity corresponding to the first charging curve and a fourth capacity corresponding to the second charging curve according to a second voltage, setting the product of the ratio of the second capacity to the first capacity and the rated capacity of the battery as the current rated capacity of the battery if the absolute value of the difference between the ratio of the second capacity to the fourth capacity and the ratio of the first capacity to the third capacity is smaller than a first preset threshold, wherein the first charging curve is an initial charging curve of the battery, the second charging curve is a charging curve of the battery after the battery is circularly charged and discharged for a preset number of times, the first voltage is less than the second voltage, and the second voltage is less than a charge cutoff voltage of the battery.
Description
Technical Field
The present disclosure relates to the field of battery technologies, and in particular, to a battery capacity correction method and a battery management system.
Background
With the development of economy and the demand of energy conservation and emission reduction of society, new energy automobiles become a development consensus in the automobile field, and electric automobiles are an important technical route in the development direction. The electric automobile is a vehicle powered by a power battery, and the performance of the power battery, which is an important component of the electric automobile, directly affects the performance of the electric automobile.
A Battery Management System (BMS) is a core controller of a Battery system of an electric vehicle, and controls high-voltage power supply and discharge, discharge capacity control, charge control, high-voltage safety control, equalization control, service life monitoring, and the like of the Battery system. The service life monitoring is a core function for controlling the discharging depth of a vehicle battery system in the middle and later periods of the use of the vehicle. At present, a service life monitoring method usually refers to battery service life test data for service life estimation based on actual vehicle charge and discharge capacity. However, due to different use conditions of the vehicle and different consistency of the battery system, the service life of the battery system calculated by the method can generate certain deviation along with use, and the performance of the whole vehicle is influenced.
Disclosure of Invention
In view of this, the present application provides a battery capacity correction method and a battery management system, which improve accuracy of battery capacity by correcting the battery capacity, thereby improving performance of the entire vehicle.
In one implementation, the present application provides a battery capacity correction method, the method comprising: acquiring a first capacity corresponding to a first charging curve of a battery and a second capacity corresponding to a second charging curve of the battery according to a first voltage; acquiring a third capacity corresponding to the first charging curve and a fourth capacity corresponding to the second charging curve according to a second voltage; the first charging curve is an initial charging curve of the battery, the second charging curve is a charging curve of the battery after the battery is subjected to cyclic charging and discharging for a preset number of times, the first voltage is smaller than the second voltage, and the second voltage is smaller than a charging cut-off voltage of the battery; acquiring the rated capacity of the battery; and if the absolute value of the difference value between the ratio of the second capacity to the fourth capacity and the ratio of the first capacity to the third capacity is smaller than a first preset threshold, setting the product of the ratio of the second capacity to the first capacity and the rated capacity as the current rated capacity of the battery.
Further, if the absolute value of the difference between the ratio of the second capacity to the fourth capacity and the ratio of the first capacity to the third capacity is smaller than a first preset threshold, and the absolute value of the difference between the ratio of the second capacity to the first capacity and the battery state of health SOH of the battery is smaller than a second preset threshold, the product of the ratio of the second capacity to the first capacity and the rated capacity is used as the current rated capacity of the battery.
Optionally, the battery is charged to a charging cut-off voltage within a preset temperature range according to a first preset current; discharging the battery to a discharge cut-off voltage according to a second preset current; and the first charging curve of the voltage and the battery capacity is obtained by charging according to a third preset current.
Optionally, a plurality of voltage data and a plurality of corresponding battery capacity data are obtained, where the plurality of voltage data includes the first voltage and the second voltage, the first voltage is a minimum value of the plurality of voltage data, and the second voltage is a maximum value of the plurality of voltage data; acquiring a second charging curve according to the plurality of voltage data and the plurality of corresponding battery capacity data; the plurality of voltage data satisfy the following condition: within a preset time, the temperature corresponding to each voltage of the plurality of voltage data is within the preset temperature range, and the absolute value of the difference of the temperatures corresponding to each voltage of the plurality of voltage data is smaller than a preset temperature threshold; the absolute value of the difference between the charging current corresponding to each of the plurality of voltage data and the third preset current is smaller than a first current threshold, and the absolute value of the difference between the charging current corresponding to each of the plurality of voltage data is smaller than a second current threshold.
Further, the third predetermined current is 1/3C.
In another implementation, the present application further provides a battery management system, which includes a unit for implementing the above battery capacity correction, wherein each step may be implemented by a separate unit, or all or part of the units may be integrated together. These units may be logic units, stored in the form of software or hardware, for example, in a memory in the form of a program, which is called by a processor to implement the functions of the respective units; as another example, the instructions may be implemented in hardware circuitry, such as may be implemented by logic gates.
In one example, the present application provides a battery management system comprising: the device comprises an acquisition unit, a storage unit and a control unit, wherein the acquisition unit is used for acquiring a first capacity corresponding to a first charging curve of a battery and a second capacity corresponding to a second charging curve of the battery according to a first voltage; acquiring a third capacity corresponding to the first charging curve and a fourth capacity corresponding to the second charging curve according to a second voltage; the first charging curve is an initial charging curve of the battery, the second charging curve is a charging curve of the battery after the battery is subjected to cyclic charging and discharging for a preset number of times, the first voltage is smaller than the second voltage, and the second voltage is smaller than a charging cut-off voltage of the battery; the acquisition unit is further used for acquiring the rated capacity of the battery; and the correction unit is used for setting the product of the ratio of the second capacity to the first capacity and the rated capacity as the current rated capacity of the battery if the absolute value of the difference value of the ratio of the second capacity to the fourth capacity and the ratio of the first capacity to the third capacity is smaller than a first preset threshold.
Further, the correction unit is configured to: and if the absolute value of the difference between the ratio of the second capacity to the fourth capacity and the ratio of the first capacity to the third capacity is smaller than a first preset threshold, and the absolute value of the difference between the ratio of the second capacity to the first capacity and the state of health (SOH) of the battery is smaller than a second preset threshold, taking the product of the ratio of the second capacity to the first capacity and the rated capacity as the current rated capacity of the battery.
In another example, the present application also provides a battery management system including a processor for calling a program stored in a memory to implement the above battery capacity correction method.
In yet another implementation, the present application further provides a storage medium having stored therein program code, which when called by a processor, causes the processor to implement the above battery capacity correction method.
Through the method, the battery capacity can be corrected, the accuracy of the battery capacity is improved, and therefore the performance of the whole vehicle is improved.
Drawings
The following description of specific embodiments of the present application will be made with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a method for correcting a capacity of a battery according to an embodiment of the present disclosure;
fig. 2 is a schematic view of a charging curve according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a battery management system according to an embodiment of the present application;
fig. 4 is a schematic diagram of another battery management system according to an embodiment of the present disclosure.
Detailed Description
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the present application, and that for a person skilled in the art, other drawings and other embodiments can be obtained from these drawings without inventive effort. For the sake of simplicity, the drawings only schematically show the parts relevant to the present application, and they do not represent the actual structure as a product.
The BMS determines the state of the whole power battery system by detecting the states of all the single batteries in the battery pack, and performs corresponding control adjustment and strategy implementation on the power battery system according to the states of the single batteries, so that the charging and discharging management of the power battery system and all the single batteries is realized to ensure that the power battery system operates safely and stably.
The functions of the BMS include, but are not limited to, the following:
(1) measurement of battery terminal voltage;
(2) energy balance among the single batteries;
(3) measuring the total voltage of the battery pack;
(4) measuring the total current of the battery pack;
(5) calculating the SOC;
accurately estimating the State of Charge (SOC), namely the residual electric quantity of the battery, of the power battery pack, ensuring that the SOC is maintained in a reasonable range, preventing the damage to the battery due to overcharge or overdischarge,
(6) dynamically monitoring the working state of the power battery pack;
in the process of charging and discharging the batteries, the terminal voltage and temperature, the charging and discharging current and the total voltage of the battery pack of each battery in the battery pack are collected in real time, so that the overcharge or overdischarge phenomenon of the batteries is prevented.
(7) Displaying the real-time data;
(8) and (4) recording and analyzing data, and simultaneously selecting the problematic battery, so that the reliability and the high efficiency of the operation of the whole battery set are maintained.
The battery of the embodiment of the present application may be a lithium iron phosphate battery, a ternary battery, or a power battery of the type thereof, and the battery of the embodiment of the present application may refer to a cell, a battery module, or a battery pack, and the embodiment of the present application is not limited.
The scheme of the embodiment of the application is described below with reference to the attached drawings.
Please refer to fig. 1, which is a schematic diagram of a battery capacity correction method according to an embodiment of the present disclosure. As shown in fig. 1, the method is performed by a BMS or a chip within the BMS, and includes the steps of:
s110: acquiring a first capacity corresponding to a first charging curve of the battery and a second capacity corresponding to a second charging curve of the battery according to the first voltage;
acquiring a third capacity corresponding to the first charging curve and a fourth capacity corresponding to the second charging curve according to a second voltage;
s120: obtaining the rated capacity of the battery;
s130: setting the product of the ratio of the second capacity to the first capacity and the rated capacity as the current rated capacity of the battery if the absolute value of the difference between the ratio of the second capacity to the fourth capacity and the ratio of the first capacity to the third capacity is less than a first preset threshold;
the first charging curve is an initial charging curve of the battery, the second charging curve is a charging curve of the battery after the battery is subjected to cyclic charging and discharging for a preset number of times, the first voltage is smaller than the second voltage, and the second voltage is smaller than a charging cut-off voltage of the battery.
Through the method, the battery capacity can be corrected according to the actual service condition of the battery, so that the battery capacity is closer to the true value, the accuracy of the battery capacity is improved, and the performance of the whole vehicle is improved.
In the above example shown in fig. 1, in some embodiments, the accuracy of the battery capacity may be further improved by considering the influence of the battery health in the battery capacity correction. The method S130 may specifically be: setting a product of a ratio of the second capacity to the first capacity and the rated capacity as the current rated capacity of the battery if an absolute value of a difference between a ratio of the second capacity to the fourth capacity and a ratio of the first capacity to the third capacity is smaller than a first preset threshold and an absolute value of a difference between a ratio of the second capacity to the first capacity and a battery State of Health (SOH) of the battery is smaller than a second preset threshold.
The SOH of a battery is the ratio of the capacity of a power battery discharged from a fully charged state to a cut-off voltage at a certain rate under standard conditions to its corresponding nominal capacity, which is a reflection of the state of health of the battery.
From the perspective of the remaining capacity of the battery, the SOH may be a ratio of the maximum capacity currently available to the battery to the maximum capacity when the battery is not in use;
from the perspective of releasing the starting power from the battery energy, the SOH may be a ratio of a difference between the starting power discharged from the battery in real time and a minimum starting power required by the electric vehicle to a difference between the starting power discharged from the battery predicted at a State of Charge (SOC) and the minimum starting power;
from a battery capacity perspective, the SOH may be the ratio of the measured capacity of the battery to the nominal capacity of the battery;
from the perspective of the internal resistance of the battery, the SOH may be a ratio of a difference between the internal resistance at the end of the battery life and the internal resistance of the current state of the battery to a difference between the internal resistance at the end of the battery life and the internal resistance of the battery when the battery leaves the factory.
In some embodiments, the first charging curve of the battery, i.e. the initial charging curve of the battery, may be obtained by:
charging the battery to a charging cut-off voltage according to a first preset current within a preset temperature range;
then discharging the battery to a discharge cut-off voltage according to a second preset current;
finally, the battery is charged according to a third preset current, namely the first charging curve of the available voltage and the battery capacity.
Optionally, the battery is subjected to constant current charging to a charging cut-off voltage according to a first preset current of 0.04 to 0.2C.
Optionally, the battery is subjected to constant current discharge to a discharge cut-off voltage according to a second preset current of 0.2-0.6C.
Optionally, the battery is charged with a constant current according to a third preset current of 1/3C.
Where C represents the ratio of the magnitude of current at the time of charge and discharge of the battery, i.e., the rate.
Optionally, the preset temperature range is-15 ℃ to 55 ℃.
Optionally, in the process of acquiring the first charging curve, in order to ensure accuracy, the battery needs to be left standing.
In some embodiments, the second charging curve of the battery, i.e. the charging curve of the battery after the battery is charged and discharged for a preset number of cycles, may be obtained as follows:
acquiring a plurality of voltage data and a plurality of corresponding battery capacity data, wherein the plurality of voltage data comprise the first voltage and the second voltage, the first voltage is the minimum value of the plurality of voltage data, and the second voltage is the maximum value of the plurality of voltage data;
acquiring the second charging curve according to the plurality of voltage data and the plurality of corresponding battery capacity data;
the plurality of voltage data satisfy the following conditions:
within a preset time, the temperature corresponding to each voltage of the plurality of voltage data is within the preset temperature range, and the absolute value of the difference between the temperatures corresponding to each voltage of the plurality of voltage data is smaller than a preset temperature threshold;
an absolute value of a difference between the charging current corresponding to each of the plurality of voltage data and the third preset current is smaller than a first current threshold, and an absolute value of a difference between the charging current corresponding to each of the plurality of voltage data is smaller than a second current threshold.
To further illustrate aspects of embodiments of the present application, reference is made to FIG. 2 for a detailed description.
Please refer to fig. 2, which is a schematic diagram of a charging curve according to an embodiment of the present disclosure. In fig. 2, the ordinate represents the charging voltage of the battery system, and the abscissa represents the charging capacity of the battery. Curve 1 is the initial charging curve of the battery, and curve 2 is the charging curve of the battery after the battery is charged and discharged for a preset number of cycles.
For curve 1, the battery capacity corresponding to the minimum voltage V _ fixmin is Cap _ Normal1, and the battery capacity corresponding to the maximum voltage V _ fixmax is Cap _ Normal 1; for curve 2, the battery capacity corresponding to V _ fixmin is Cap _ fix1, the battery capacity corresponding to V _ fixmax is Cap _ fix2, and V _ Stop is the charge cut-off voltage.
When the following conditions are satisfied:
(1) | Cap _ fix1/Cap _ fix2-Cap _ Normal1/Cap _ Normal2| is less than Δ 1,
(2) | Cap _ fix1/Cap _ Normal1-SOH | is less than Δ 2,
then Cap _ Now ═ Cap _ Normal ═ Cap _ fix1/Cap _ Normal 1;
wherein, Cap _ Normal is the rated capacity of the battery, Cap _ Now is the corrected current rated capacity of the battery, and SOH is the battery state of health of the battery.
Therefore, in the scheme of the embodiment of the application, the difference between the current battery capacity and the initial capacity can be calculated in real time, and the capacity can be corrected, so that the current battery capacity reflects the real battery state.
Based on the same inventive concept, the embodiment of the present application further provides a battery management system, which includes a unit for implementing the above battery capacity correction, wherein each step may be implemented by an independent unit, or all or part of the units may be integrated together. These units may be logic units for performing the methods performed by the battery management system in the above method embodiments.
In one implementation, please refer to fig. 3, which is a schematic diagram of a battery management system according to an embodiment of the present disclosure. As shown in fig. 3, the battery management system 300 includes an obtaining unit 310 and a correcting unit 320.
The obtaining unit 310 is configured to obtain a first capacity corresponding to a first charging curve of a battery and a second capacity corresponding to a second charging curve of the battery according to a first voltage; acquiring a third capacity corresponding to the first charging curve and a fourth capacity corresponding to the second charging curve according to a second voltage;
the obtaining unit 310 is further configured to obtain a rated capacity of the battery.
A correcting unit 320, configured to set a product of a ratio of the second capacity to the first capacity and the rated capacity as a current rated capacity of the battery if an absolute value of a difference between a ratio of the second capacity to the fourth capacity and a ratio of the first capacity to the third capacity is smaller than a first preset threshold;
the first charging curve is an initial charging curve of the battery, the second charging curve is a charging curve of the battery after the battery is subjected to cyclic charging and discharging for a preset number of times, the first voltage is smaller than the second voltage, and the second voltage is smaller than a charging cut-off voltage of the battery.
Further, the correcting unit 320 is configured to set a product of the ratio of the second capacity to the first capacity and the rated capacity as the current rated capacity of the battery if an absolute value of a difference between the ratio of the second capacity to the fourth capacity and the ratio of the first capacity to the third capacity is smaller than a first preset threshold, and an absolute value of a difference between the ratio of the second capacity to the first capacity and the SOH of the battery is smaller than a second preset threshold.
The method for the operation performed by each unit may specifically refer to the method embodiment shown in fig. 1, and is not described herein again.
The division of each unit of the battery management system is only a division of a logic function, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. And these units can be realized in the form of software called by processor; or may be implemented entirely in hardware; and part of the units can be realized in the form of calling by a processor through software, and part of the units can be realized in the form of hardware.
For example, the functions of the above units may be stored in a memory in the form of program codes, which are scheduled by a processor to implement the functions of the above units. The Processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling programs. As another example, the above units may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more Digital Signal Processors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), etc. For another example, in combination with the above two methods, part of the functions is implemented in the form of a scheduler code of the processor, and part of the functions is implemented in the form of a hardware integrated circuit. And when the above functions are integrated together, the functions can be realized in the form of a system-on-a-chip (SOC).
In yet another implementation, please refer to fig. 4, which is a schematic diagram of another battery management system provided in the embodiment of the present application. As shown in fig. 4, the battery management system includes a processor 410 and a memory 420, and the processor is configured to call a program stored in the memory to implement the above-described battery capacity correction method.
Based on the same inventive concept, embodiments of the present application also provide a program product, such as a computer-readable storage medium, which includes program code, when called by a processor, causes the processor to implement the above battery capacity correction method.
Those skilled in the art will understand that: all or part of the steps of implementing the above method embodiments may be implemented by hardware associated with program instructions, and the above program may be stored in a computer-readable storage medium, where the program codes are called by a processor, and the processor is used to execute the methods executed by the BMS in the above method embodiments. The embodiment of the present application does not limit the form and number of the memory and the processor, for example, the memory may be a CPU or other processor capable of calling a program, and the memory may be various media capable of storing program codes, such as a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (10)
1. A battery capacity correction method, characterized by comprising:
acquiring a first capacity corresponding to a first charging curve of a battery and a second capacity corresponding to a second charging curve of the battery according to a first voltage;
acquiring a third capacity corresponding to the first charging curve and a fourth capacity corresponding to the second charging curve according to a second voltage; the first charging curve is an initial charging curve of the battery, the second charging curve is a charging curve of the battery after the battery is subjected to cyclic charging and discharging for a preset number of times, the first voltage is smaller than the second voltage, and the second voltage is smaller than a charging cut-off voltage of the battery;
acquiring the rated capacity of the battery;
and if the absolute value of the difference value between the ratio of the second capacity to the fourth capacity and the ratio of the first capacity to the third capacity is smaller than a first preset threshold, setting the product of the ratio of the second capacity to the first capacity and the rated capacity as the current rated capacity of the battery.
2. The method according to claim 1, wherein if the absolute value of the difference between the ratio of the second capacity to the fourth capacity and the ratio of the first capacity to the third capacity is smaller than a first preset threshold, taking the product of the ratio of the second capacity to the first capacity and the rated capacity as the current rated capacity of the battery comprises:
and if the absolute value of the difference between the ratio of the second capacity to the fourth capacity and the ratio of the first capacity to the third capacity is smaller than a first preset threshold, and the absolute value of the difference between the ratio of the second capacity to the first capacity and the state of health (SOH) of the battery is smaller than a second preset threshold, setting the product of the ratio of the second capacity to the first capacity and the rated capacity as the current rated capacity of the battery.
3. The method of claim 1 or 2, wherein the obtaining of the first charging profile comprises:
the battery is charged to a charging cut-off voltage within a preset temperature range according to a first preset current;
discharging the battery to a discharge cut-off voltage according to a second preset current;
and the first charging curve of the voltage and the battery capacity is obtained by charging according to a third preset current.
4. The method of claim 3, wherein the obtaining of the second charging profile comprises:
acquiring a plurality of voltage data and a plurality of corresponding battery capacity data, wherein the plurality of voltage data comprise the first voltage and the second voltage, the first voltage is the minimum value of the plurality of voltage data, and the second voltage is the maximum value of the plurality of voltage data;
acquiring a second charging curve according to the plurality of voltage data and the plurality of corresponding battery capacity data;
the plurality of voltage data satisfy the following condition:
within a preset time, the temperature corresponding to each voltage of the plurality of voltage data is within the preset temperature range, and the absolute value of the difference of the temperatures corresponding to each voltage of the plurality of voltage data is smaller than a preset temperature threshold;
the absolute value of the difference between the charging current corresponding to each of the plurality of voltage data and the third preset current is smaller than a first current threshold, and the absolute value of the difference between the charging current corresponding to each of the plurality of voltage data is smaller than a second current threshold.
5. The method of claim 3, wherein the third predetermined current is 1/3C.
6. A Battery Management System (BMS), comprising:
the device comprises an acquisition unit, a storage unit and a control unit, wherein the acquisition unit is used for acquiring a first capacity corresponding to a first charging curve of a battery and a second capacity corresponding to a second charging curve of the battery according to a first voltage;
acquiring a third capacity corresponding to the first charging curve and a fourth capacity corresponding to the second charging curve according to a second voltage; the first charging curve is an initial charging curve of the battery, the second charging curve is a charging curve of the battery after the battery is subjected to cyclic charging and discharging for a preset number of times, the first voltage is smaller than the second voltage, and the second voltage is smaller than a charging cut-off voltage of the battery;
the acquisition unit is further used for acquiring the rated capacity of the battery;
and the correction unit is used for setting the product of the ratio of the second capacity to the first capacity and the rated capacity as the current rated capacity of the battery if the absolute value of the difference value of the ratio of the second capacity to the fourth capacity and the ratio of the first capacity to the third capacity is smaller than a first preset threshold.
7. The BMS of claim 6, wherein the modification unit is to:
and if the absolute value of the difference between the ratio of the second capacity to the fourth capacity and the ratio of the first capacity to the third capacity is smaller than a first preset threshold, and the absolute value of the difference between the ratio of the second capacity to the first capacity and the state of health (SOH) of the battery is smaller than a second preset threshold, taking the product of the ratio of the second capacity to the first capacity and the rated capacity as the current rated capacity of the battery.
8. The BMS of claim 6 or 7, wherein the obtaining unit is further configured to: the battery is charged to a charging cut-off voltage within a preset temperature range according to a first preset current;
discharging the battery to a discharge cut-off voltage according to a second preset current;
and the first charging curve of the voltage and the battery capacity is obtained by charging according to a third preset current.
9. The BMS of claim 8, wherein the obtaining unit is further configured to:
acquiring a plurality of voltage data and a plurality of corresponding battery capacity data, wherein the plurality of voltage data comprise the first voltage and the second voltage, the first voltage is the minimum value of the plurality of voltage data, and the second voltage is the maximum value of the plurality of voltage data;
acquiring a second charging curve according to the plurality of voltage data and the plurality of corresponding battery capacity data;
the plurality of voltage data satisfy the following condition:
within a preset time, the temperature corresponding to each voltage of the plurality of voltage data is within the preset temperature range, and the absolute value of the difference of the temperatures corresponding to each voltage of the plurality of voltage data is smaller than a preset temperature threshold;
the absolute value of the difference between the charging current corresponding to each of the plurality of voltage data and the third preset current is smaller than a first current threshold, and the absolute value of the difference between the charging current corresponding to each of the plurality of voltage data is smaller than a second current threshold.
10. The BMS of claim 8, wherein the third predetermined current is 1/3C.
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| CN117471328A (en) * | 2023-12-27 | 2024-01-30 | 高新兴科技集团股份有限公司 | Method, system and terminal equipment for determining capacity of lead-acid battery |
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