CN114035083B - Method, device, system and storage medium for calculating total capacity of battery - Google Patents
Method, device, system and storage medium for calculating total capacity of battery Download PDFInfo
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- CN114035083B CN114035083B CN202111520995.0A CN202111520995A CN114035083B CN 114035083 B CN114035083 B CN 114035083B CN 202111520995 A CN202111520995 A CN 202111520995A CN 114035083 B CN114035083 B CN 114035083B
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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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- 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
Abstract
The invention discloses a method, a device, a system and a storage medium for calculating total capacity of a battery. The method for calculating the total capacity of the battery comprises the following steps: acquiring battery current input into a battery to be tested or output by the battery to be tested; determining battery capacity input to the battery to be tested or output by the battery to be tested in the preset duration based on the battery current; acquiring aging compensation information, temperature compensation information and current residual electric quantity of the battery to be tested; and determining the total battery capacity of the battery to be tested based on the aging compensation information, the temperature compensation information, the input or output battery capacity and the current residual electric quantity of the battery to be tested. By adopting the scheme, complicated steps for calibrating the total capacity of the battery are not needed, the output total capacity of the battery can be refreshed in time according to the changes of the running state and the use working condition of the battery, the influence of aging and temperature change of the battery on the calculation of the total capacity can be reduced, and the effect that the calculated total capacity is accurate is realized.
Description
Technical Field
The embodiment of the invention relates to a battery capacity calculation technology, in particular to a method, a device, a system and a storage medium for calculating the total capacity of a battery.
Background
Currently, batteries used in daily life in the market can be roughly classified into two types, a lead-acid battery and a lithium battery; the lead-acid battery has the advantages of low price, safety, reliability and stable discharge, so that the lead-acid battery has a good market application range and is widely used as a vehicle-mounted battery. The total capacity of the lead-acid battery is the basis for calculating the residual capacity of the battery, and the residual capacity (SOC) of the lead-acid battery can intuitively display the battery state and directly influence the use of the vehicle and the battery by a user, so that the accuracy of the total capacity of the battery is necessarily improved to improve the calculation accuracy of the residual capacity of the battery, thereby improving the user experience and the use efficiency of the battery. However, lead-acid batteries are affected by problems such as manufacturing process, temperature changes, battery aging, etc., and the actual total capacity of the battery varies greatly and is inconsistent with the nominal capacity and is difficult to determine.
The traditional battery total capacity calibration adopts a constant current discharge method, namely, a group of batteries are subjected to constant current discharge by using 0.5C current until the voltage is reduced to a cut-off voltage, and the total capacity released in the process is the battery total capacity; however, in the practical application scene, the discharge current of the battery is continuously changed, and meanwhile, the smaller the discharge current is, the more the capacity can be released when the discharge current reaches the cut-off voltage due to the characteristic relation between the voltage and the current of the lead-acid battery; the total capacity of the battery calibrated under the constant current working condition cannot be matched with the actual working condition, the difference between the total capacity released by the battery and the nominal capacity is large, and the calculation of the residual capacity (SOC) is abnormal due to the error of the data of the total capacity of the battery; the phenomenon that the battery can not discharge when the residual electric quantity is higher, can still discharge for a long time when the residual electric quantity is lower, or can still display lower residual electric quantity after full charge easily occurs, so that a user can not charge the battery in time or continuously charge the battery after full charge in daily use, the over-discharge and over-charge problems of the battery are caused, and the service life and the use safety of the battery are seriously influenced.
Disclosure of Invention
The invention provides a method, a device, a system and a storage medium for calculating the total capacity of a battery, so as to realize the effect of avoiding the complicated step of calibrating the total capacity of the battery and ensuring that the calculated total capacity is more accurate.
In a first aspect, an embodiment of the present invention provides a method for calculating a total battery capacity, where the method includes:
acquiring battery current input into a battery to be tested or output by the battery to be tested;
determining battery capacity input to the battery to be tested or output by the battery to be tested in the preset duration based on the battery current;
acquiring aging compensation information, temperature compensation information and current residual electric quantity of the battery to be tested;
and determining the total battery capacity of the battery to be tested based on the aging compensation information, the temperature compensation information, the input or output battery capacity and the current residual electric quantity of the battery to be tested.
In an optional embodiment of the present invention, the obtaining the aging compensation information of the battery to be tested includes:
acquiring the battery internal resistance Ri of the battery to be measured at the current moment and the total use time t of the battery to be measured at the current moment, wherein the current moment is the moment corresponding to the battery current;
the aging compensation information of the battery to be tested is determined by the following formula:
wherein, R0 is the minimum value of the internal resistance of the preset battery, t0 is the maximum value of the allowable use time of the preset battery, kr is the ageing compensation information, and Ri is the current internal resistance of the battery.
In an optional embodiment of the present invention, before the obtaining the aging compensation information of the battery to be tested, the method includes:
determining whether the battery internal resistance Ri is larger than a preset battery internal resistance minimum value R0 which is 2 times larger than the battery internal resistance Ri; or whether the total time of use t is greater than t0;
if yes, the aging compensation information is 0.
In an optional embodiment of the present invention, the obtaining temperature compensation information of the battery to be measured includes:
acquiring the current temperature Ti of the battery to be measured at the current moment, and determining the temperature compensation information of the battery to be measured according to the following formula;
wherein T0 is the preset battery operating temperature, ti is the current temperature of the battery, and Kt is the temperature compensation information.
In an optional embodiment of the present invention, the determining the total battery capacity of the battery to be measured based on the aging compensation information, the temperature compensation information, the input or output battery capacity, and the current remaining power of the battery to be measured includes:
calculating the total capacity of the battery according to a total capacity calculation formula of the battery:
the calculation formula of the total capacity of the battery is as follows:
wherein, SOC is the current residual electric quantity, K is the capacity compensation information, ci is the input or output battery capacity, and C is the total capacity of the battery;
the capacity compensation information is k=epsilon+gamma×kt; wherein, gamma is more than 0 and epsilon is more than 0.
In an alternative embodiment of the present invention, before the calculating the total capacity of the battery by the capacity calculation formula, the method further includes:
determining whether the capacity compensation information exceeds a preset capacity compensation range;
if yes, taking the total capacity of the historical battery as the total capacity of the battery to output;
and if not, outputting the total capacity of the battery.
In an alternative embodiment of the present invention, before the outputting the total capacity of the battery, the method further includes:
determining whether the total capacity of the battery exceeds a preset battery capacity range;
if yes, taking the total capacity of the historical battery as the total capacity of the battery to output;
and if not, outputting the total capacity of the battery.
In an alternative embodiment of the present invention, the determining, based on the battery current, a battery capacity of the battery under test or the battery under test output at the preset time period includes:
calculating the battery capacity input to the battery to be tested or the battery to be tested output through a battery capacity calculation formula:
the battery capacity calculation formula is as follows: ci=η++i dt;
wherein eta is charge-discharge efficiency, i is battery current, and Ci is battery capacity input into or output from the battery to be tested.
In an optional embodiment of the present invention, the obtaining the current remaining power of the battery to be measured includes:
acquiring the battery current, the historical residual capacity and the total capacity of the historical battery, and determining the current residual capacity of the battery to be tested according to the following formula;
wherein, SOC is the current residual electric quantity, SOC 0 C is the historical residual electric quantity 0 I is the battery current, which is the historical battery total capacity.
In an alternative embodiment of the invention, the method further comprises:
and when the total battery capacity is calculated and recalculated at the next moment of the moment, calculating the current residual capacity at the next moment based on the total battery capacity at the current moment as the historical total battery capacity.
In a second aspect, an embodiment of the present invention further provides a battery total capacity calculation apparatus, including:
the current acquisition module is used for acquiring battery current input into a battery to be detected or output by the battery to be detected;
the capacity determining module is used for determining the battery capacity input into the battery to be tested or output by the battery to be tested in the preset duration based on the battery current;
the acquisition module is used for acquiring the aging compensation information, the temperature compensation information and the current residual electric quantity of the battery to be tested;
and the total capacity determining module is used for determining the total battery capacity of the battery to be tested based on the aging compensation information, the temperature compensation information, the input or output battery capacity and the current residual capacity of the battery to be tested.
According to the invention, the battery current input into the battery to be tested or output by the battery to be tested is obtained; determining battery capacity input to the battery to be tested or output by the battery to be tested in the preset duration based on the battery current; then, ageing compensation information, temperature compensation information and current residual electric quantity of the battery to be tested are obtained; and finally, determining the total battery capacity of the battery to be tested based on the aging compensation information, the temperature compensation information, the input or output battery capacity and the current residual capacity of the battery to be tested, so that complicated steps of calibrating the total battery capacity are not needed, the battery current of the battery to be tested in the charging and discharging processes is obtained in real time, the output total battery capacity can be refreshed in time according to the change of the battery running state and the use working condition, the influence of the battery aging and the temperature change on the total capacity calculation can be reduced, and the effect that the calculated total capacity is more accurate is realized.
Drawings
Fig. 1 is a flowchart of a method for calculating total capacity of a battery according to a first embodiment of the present invention;
fig. 2 is a flowchart of a method for calculating total capacity of a battery according to a second embodiment of the present invention;
fig. 3 is a flowchart of a method for calculating total capacity of a battery according to a third embodiment of the present invention;
fig. 4 is a block diagram of a battery total capacity calculating device according to a fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of a battery total capacity computing system according to a fifth embodiment of the present invention.
61, a current acquisition module; 62. a capacity determination module; 63. an acquisition module; 64. a total capacity determination module; 70. a processor; 71. a memory; 72. an input device; 73. and an output device.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a flowchart of a method for calculating total capacity of a battery according to an embodiment of the present invention, where the method may be executed by a system for calculating total capacity of a lead-acid battery, and as shown in fig. 1, the method for calculating total capacity of a battery specifically includes the following steps:
s110, obtaining battery current input into a battery to be tested or output by the battery to be tested.
The battery to be measured is a battery with total capacity to be measured; the input battery current refers to the current value of the loop of the battery to be tested when the battery to be tested charges and inputs electric energy, and the output battery current refers to the current value of the loop of the battery to be tested when the battery to be tested discharges and outputs electric energy. Because the battery to be measured may be in different states of charge or discharge, the battery current input into the battery to be measured or output by the battery to be measured is obtained in real time according to the different states of the battery to be measured. There are various ways of obtaining the battery current, for example, a charging circuit or a discharging circuit of the battery to be tested is connected with an ammeter, and the way of obtaining the battery current is not specifically limited herein, but only exemplified.
And S120, determining the battery capacity input into the battery to be tested or output from the battery to be tested in the preset time length based on the battery current.
The input battery capacity refers to the electric quantity received when the battery to be tested is charged, and the output battery capacity refers to the electric quantity which can be discharged to other electric appliances when the battery to be tested is discharged. According to the current battery current, the corresponding input or output battery capacity is correspondingly different, so that the battery capacity of the battery to be tested or the battery to be tested output can be input for a preset time length under different conditions according to the battery current.
And S130, acquiring aging compensation information, temperature compensation information and current residual electric quantity of the battery to be tested.
The aging compensation information refers to information reflecting the aging degree of the battery to be measured. The temperature compensation information refers to information reflecting the current temperature condition of the battery to be measured. The current residual capacity (SOC) of the battery to be measured represents the percentage of the remaining available capacity of the battery to the total capacity, is one of the most important states in the battery management system, and provides an important reference for the functions of battery safety management, charge and discharge control, whole vehicle energy management and the like of the electric automobile. The method for determining the current remaining power may be various, such as an open circuit voltage method, an ampere-hour integration method, an internal resistance method, a kalman filtering method, a neural network method, etc., and the specific manner of determining the current remaining power is not limited.
And S140, determining the total battery capacity of the battery to be tested based on the aging compensation information, the temperature compensation information, the input or output battery capacity and the current residual electric quantity of the battery to be tested.
The current total capacity of the battery is generally related to the input or output battery capacity and the current residual capacity, and meanwhile, the aging degree and the current temperature condition of the battery also affect the calculation accuracy of the total capacity of the battery, so that the total capacity of the battery to be measured, which is determined based on the aging compensation information, the temperature compensation information, the input or output battery capacity and the current residual capacity of the battery to be measured, is accurate, and the current total capacity of the battery can be accurately reflected.
According to the scheme, the battery current input into the battery to be tested or output by the battery to be tested is obtained; determining battery capacity input to the battery to be tested or output by the battery to be tested in the preset duration based on the battery current; then, ageing compensation information, temperature compensation information and current residual electric quantity of the battery to be tested are obtained; and finally, determining the total battery capacity of the battery to be tested based on the aging compensation information, the temperature compensation information, the input or output battery capacity and the current residual capacity of the battery to be tested, so that complicated steps of calibrating the total battery capacity are not needed, the battery current of the battery to be tested in the charging and discharging processes is obtained in real time, the output total battery capacity can be refreshed in time according to the change of the battery running state and the use working condition, the influence of the battery aging and the temperature change on the total capacity calculation can be reduced, and the effect that the calculated total capacity is more accurate is realized.
In an optional embodiment of the present invention, the obtaining the aging compensation information of the battery to be tested includes:
acquiring the battery internal resistance Ri of the battery to be measured at the current moment and the total use time t of the battery to be measured at the current moment, wherein the current moment is the moment corresponding to the battery current;
the aging compensation information of the battery to be tested is determined by the following formula:
wherein R0 is the minimum value of the internal resistance of the preset battery, t0 is the maximum value of the allowable use time of the preset battery, kr is the ageing compensation information, ri is the current internal resistance of the battery, and alpha is more than 0 and beta is more than 0.
The battery internal resistance of the battery to be measured at the current moment refers to the resistance of the battery in the current flowing through the battery in the current working state, wherein the resistance comprises ohmic internal resistance and polarization internal resistance, and the polarization internal resistance comprises electrochemical polarization internal resistance and concentration polarization internal resistance. The total use time of the battery to be tested at the current moment refers to the time from the beginning of the use of the battery to the moment when the battery to be tested is in a working state, and the maximum allowable use time of the preset battery refers to the preset maximum service life of the battery to be tested.
Alpha and beta are engineering coefficients measured through experiments, and the larger the total use time t of the current battery is, the larger the internal resistance Ri of the current battery is, the more serious the aging degree is, and the smaller Kr is; when Ri > 2×r0, or t > t0, the battery to be tested has been deeply aged, and kr=0. Therefore, by knowing the internal resistance Ri of the battery to be measured at the current moment and the total use time t of the battery to be measured at the current moment, the aging compensation information of the battery to be measured can be conveniently calculated, and the calculation of the aging compensation information is more convenient and accurate.
Based on the foregoing embodiment, before the obtaining the aging compensation information of the battery to be tested, the method includes:
determining whether the battery internal resistance Ri is larger than a preset battery internal resistance minimum value R0 which is 2 times larger than the battery internal resistance Ri; or whether the total time of use t is greater than t0.
If yes, the aging compensation information is 0.
Wherein, the battery has a certain service life, and the larger the total service time and the larger the internal resistance of the battery, the more serious the aging degree of the battery is. The preset battery internal resistance minimum value refers to the internal resistance value of the battery when the preset battery resistance to be tested is in the initial use state, and when the battery internal resistance Ri is larger than 2 times of the preset battery internal resistance minimum value R0 or the total use time t is larger than the maximum value t0 of the allowable use time of the preset battery, the battery is deeply aged, so that the step of deeply aging the battery to make the aging compensation information be 0 can be executed at the moment, and the aging condition of the battery to be tested can be timely known.
In an optional embodiment of the present invention, the obtaining temperature compensation information of the battery to be measured includes:
and acquiring the current temperature Ti of the battery to be measured at the current moment, and determining the temperature compensation information of the battery to be measured according to the following formula.
Wherein T0 is the preset battery operating temperature, ti is the current temperature of the battery, and Kt is the temperature compensation information.
The current temperature of the battery refers to the temperature of the battery in the current working state, and the preset battery running temperature refers to the temperature of the battery in the normal running condition. When the current temperature of the battery is greater than the preset battery operation temperature, the battery temperature is indicated to be increased, the total capacity of the battery is increased, and when the current temperature of the battery is less than the preset battery operation temperature, the battery temperature is indicated to be reduced, and the total capacity of the battery is reduced, so that the temperature compensation information of the battery to be detected can be conveniently determined according to the current temperature of the battery and the preset battery operation temperature.
When Kt is more than 1, representing that the temperature of the battery is increased, the total capacity of the battery is increased; when Kt is less than 1, the temperature of the battery is reduced, and the total capacity of the battery is reduced, so that the temperature compensation information of the battery to be measured can be conveniently obtained according to the formula.
Example two
Fig. 2 is a flowchart of a method for calculating total capacity of a battery according to a second embodiment of the present invention, which is optimized based on the first embodiment. As shown in fig. 2, the method includes:
s210, obtaining battery current input into a battery to be tested or output by the battery to be tested.
And S220, determining the battery capacity input into the battery to be tested or output from the battery to be tested in the preset time length based on the battery current.
And S230, acquiring aging compensation information, temperature compensation information and current residual electric quantity of the battery to be tested.
S240, determining whether the capacity compensation information exceeds a preset capacity compensation range.
If yes, go to step S250, if no, go to steps S260 and S270.
Wherein the capacity compensation information is k=epsilon+kr+gamma; wherein, gamma is more than 0 and epsilon is more than 0.
The higher the battery aging degree is, the lower the total battery capacity is, the battery temperature is increased, the total battery capacity is increased, the battery temperature is reduced, and the total battery capacity is reduced. Therefore, the aging degree and the temperature condition of the battery can influence the actual total capacity of the battery, and the capacity compensation information refers to information for compensating the deviation of the aging degree and the temperature condition of the battery to the actual total capacity of the battery.
And gamma and epsilon are compensation coefficient weights obtained according to the battery characteristics and experimental tests. Through the formula, under the condition that the ageing compensation information Kr and the temperature compensation information Kt are known, capacity calculation compensation information can be conveniently and accurately obtained, and the reliability of the total capacity of the output battery is high.
The preset capacity compensation range refers to the fluctuation range of the capacity compensation information when the total capacity of the battery is credible.
S250, outputting the historical battery total capacity as the battery total capacity.
And S260, calculating the total capacity of the battery through a total capacity calculation formula of the battery.
The calculation formula of the total capacity of the battery is as follows:
wherein, SOC is the current residual electric quantity, K is the capacity compensation information, ci is the input or output battery capacity, and C is the total battery capacity.
The total capacity calculation formula refers to a specific algorithm capable of reflecting how to obtain the total calculated capacity of the battery through capacity compensation information, the input or output battery capacity and the current residual capacity, and the total calculated capacity of the battery can be conveniently and accurately calculated under the condition that the capacity calculation compensation information, the input or output battery capacity and the current residual capacity are known through the total capacity calculation formula of the battery.
And S270, outputting the total capacity of the battery.
When the capacity compensation information exceeds a preset capacity compensation range, the calculated total capacity value of the battery is not credible, for example, in a specific embodiment, the preset capacity compensation range is [ Kmin, kmax ], and when the capacity compensation information K satisfies K > Kmax or K < Kmin, the calculated total capacity of the battery is not credible, and the historical total capacity value of the battery is maintained; and outputting the historical battery total capacity as the battery total capacity at the moment. When the capacity calculation compensation information does not exceed the preset capacity calculation compensation range, the calculated battery calculation total capacity value is credible, and therefore the battery total capacity calculated through the battery total capacity calculation formula is output as the battery total capacity. Therefore, the total capacity of the battery can be accurately output.
Example III
Fig. 3 is a flowchart of a method for calculating total capacity of a battery according to a third embodiment of the present invention, which is optimized based on the second embodiment. As shown in fig. 3, the method includes:
s310, obtaining battery current input into a battery to be tested or output by the battery to be tested.
And S320, determining the battery capacity input into the battery to be tested or output by the battery to be tested in the preset time length based on the battery current.
S330, obtaining aging compensation information, temperature compensation information and current residual electric quantity of the battery to be tested.
S340, determining whether the capacity compensation information exceeds a preset capacity compensation range.
If yes, go to step S250, if no, go to steps S260 and S270.
And S350, outputting the historical battery total capacity as the battery total capacity.
S360, calculating the total capacity of the battery through a total capacity calculation formula of the battery.
And S370, determining whether the total capacity of the battery exceeds a preset battery capacity range.
If yes, go to step S350, if no, go to step S380.
The fluctuation range of the total capacity value obtained when the calculated total capacity of the battery is credible is indicated as the preset battery capacity range, when the total capacity of the battery exceeds the preset battery capacity range, the calculated total capacity value of the battery at the moment is not credible, for example, in a specific embodiment, when the preset battery capacity range [ Cmin, cmax ] and the total capacity C of the battery meet C > Cmax or C < Cmin, the calculated total capacity of the battery at the moment is considered to be not credible, and the historical total capacity value of the battery is maintained; and outputting the historical battery total capacity as the battery total capacity at the moment. When the total capacity of the battery does not exceed the preset battery capacity range, the calculated total capacity value of the battery is credible, and the total capacity of the battery is output. Therefore, the total capacity of the battery can be accurately output.
And S380, outputting the total capacity of the battery.
In an alternative embodiment of the present invention, the determining, based on the battery current, a battery capacity of the battery under test or the battery under test output at the preset time period includes:
and calculating the battery capacity input to the battery to be tested or output by the battery to be tested through a battery capacity calculation formula.
The battery capacity calculation formula is as follows: ci=η++i dt;
wherein eta is charge-discharge efficiency, i is battery current, and Ci is battery capacity input into or output from the battery to be tested.
Through the formula, the input or output battery capacity can be conveniently and accurately calculated.
In an optional embodiment of the present invention, the obtaining the current remaining power of the battery to be measured includes:
acquiring the battery current, the historical residual capacity and the total capacity of the historical battery, and determining the current residual capacity of the battery to be tested according to the following formula;
wherein, SOC is the current residual electric quantity, SOC 0 C is the historical residual electric quantity 0 I is the battery current, which is the historical battery total capacity.
The historical residual capacity refers to the residual capacity obtained by the last calculation, and the historical total battery capacity refers to the total battery capacity output last time. Through the formula, the current residual electric quantity can be conveniently calculated.
In an alternative embodiment of the invention, the method further comprises:
and when the total battery capacity is calculated and recalculated at the next moment of the moment, calculating the current residual capacity at the next moment based on the total battery capacity at the current moment as the historical total battery capacity.
For example, in a specific embodiment, the preset total capacity is the total capacity of a battery preset in advance, the battery is mounted on the vehicle, and when the vehicle is started for the first time, the battery can be used as C through the preset total capacity 0 Calculating the current residual capacity SOC, further obtaining the first output battery total capacity and outputting the battery total capacity on the display equipment of the vehicle, and when the vehicle is started for the second time, taking the current residual capacity SOC obtained by the first starting calculation of the vehicle as the historical residual capacity SOC 0 Taking the total capacity of the battery output by the first starting of the vehicle as C 0 Further, the current residual electricity of the vehicle during the second starting is calculatedQuantity SOC. Therefore, through the mode, the current residual electric quantity can be conveniently and accurately calculated. Meanwhile, the current residual electric quantity can be updated in real time during daily use, so that the total capacity can be updated in real time, and timeliness is achieved.
In an optional embodiment of the invention, after the obtaining the battery current input to the battery to be tested or output by the battery to be tested, the method further includes:
determining whether the battery current exceeds a preset current range; if yes, judging that the battery is in a fault state, and ending the total capacity calculation flow of the battery.
The preset current range refers to a fluctuation range of current of the battery in a normal running state, for example, the preset current range is [ Imin, imax ], when the battery current I exceeds the range, the battery is judged to be in a fault state at the moment, so that the total capacity calculation flow is ended, and the subsequent flow is not executed to calculate the total capacity of the battery. When the battery current does not exceed the preset current range, the step of calculating the total capacity of the battery can be continuously executed. In one specific embodiment, the historical battery total capacity may be output as the battery total capacity when the battery current exceeds a preset current range. By the scheme, the situation that the total capacity of the battery to be tested is still calculated when the battery to be tested fails can be avoided.
In an alternative embodiment of the invention, the method further comprises:
acquiring battery voltage input into a battery to be tested or output by the battery to be tested in real time; determining whether the battery voltage exceeds a preset voltage range; if yes, judging that the battery is in a fault state, and ending the total capacity calculation flow of the battery.
The input battery voltage refers to the voltage value of the loop of the battery to be tested when the battery to be tested charges and inputs electric energy, and the output battery voltage refers to the voltage value of the loop of the battery to be tested when the battery to be tested discharges and outputs electric energy. Because the battery to be measured may be in different states of charge or discharge, the battery voltage input into the battery to be measured or output by the battery to be measured is obtained according to the different states of the battery to be measured. There are various ways of obtaining the battery voltage, for example, a voltmeter is connected to a charging circuit or a discharging circuit of the battery to be tested, and the way of obtaining the battery voltage is not specifically limited herein, but only exemplified.
The preset voltage range refers to a voltage fluctuation range of the battery in a normal running state, for example, the preset voltage range is [ Vmin, vmax ], when the battery voltage V exceeds the range, the battery is judged to be in a fault state at the moment, so that the total capacity calculation flow is ended, and the subsequent flow is not executed to calculate the total capacity of the battery. When the battery current does not exceed the preset voltage range, the step of calculating the total battery capacity may be continuously performed to calculate the total battery capacity. In one embodiment, the historical battery total capacity may be output as the battery total capacity when the battery voltage exceeds a preset voltage range. By the scheme, the battery to be tested can be prevented from calculating the total calculated capacity of the battery when the battery to be tested fails.
Example IV
Fig. 4 is a block diagram of a battery total capacity calculation device according to a fourth embodiment of the present invention, where the battery total capacity calculation device according to the fourth embodiment of the present invention may execute the battery total capacity calculation method according to any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method. As shown in fig. 4, the battery total capacity calculation device includes:
a current acquisition module 61, configured to acquire a battery current input to a battery to be measured or output from the battery to be measured;
a capacity determining module 62 for determining a battery capacity input to the battery under test or output from the battery under test for the preset time period based on the battery current;
an obtaining module 63, configured to obtain aging compensation information, temperature compensation information, and a current remaining power of the battery to be tested;
the total capacity determining module 64 is configured to determine a total battery capacity of the battery to be measured based on the aging compensation information, the temperature compensation information, the input or output battery capacity, and the current remaining power of the battery to be measured.
In an optional embodiment of the present invention, the obtaining module 63 is further configured to obtain a battery internal resistance Ri of the battery to be measured at a current time and a total time t of use of the battery to be measured at the current time, where the current time is a time when the battery current is obtained.
The aging compensation information of the battery to be tested is determined by the following formula:
wherein R0 is a preset minimum internal resistance value of the battery, t0 is a maximum allowable use time of the preset battery, and Kr is aging compensation information.
In an alternative embodiment of the invention, the battery total capacity calculation device further comprises an aging compensation determination module.
The aging compensation determining module is used for determining whether the battery internal resistance Ri is more than 2 times of a preset battery internal resistance minimum value R0; or whether the total time of use t is greater than t0.
If yes, the aging compensation information is 0.
In an alternative embodiment of the present invention, the obtaining module 63 is further configured to obtain the current temperature Ti of the battery to be measured at the current moment, and determine the temperature compensation information of the battery to be measured according to the following formula.
Wherein T0 is the preset battery operating temperature, ti is the current temperature of the battery, and Kt is the temperature compensation information.
In an alternative embodiment of the present invention, the total capacity determining module 64 is further configured to calculate the total capacity of the battery according to a total capacity calculation formula of the battery:
the calculation formula of the total capacity of the battery is as follows:
wherein, SOC is the current residual electric quantity, K is the capacity compensation information, ci is the input or output battery capacity, and C is the total battery capacity.
The capacity compensation information is k=epsilon+gamma×kt; wherein, gamma is more than 0 and epsilon is more than 0.
In an alternative embodiment of the invention, the battery total capacity calculation device further comprises a capacity compensation range determination module.
And the capacity compensation range determining module is used for determining whether the capacity compensation information exceeds a preset capacity compensation range.
If yes, the historical battery total capacity is taken as the battery total capacity to be output.
And if not, outputting the total capacity of the battery.
In an alternative embodiment of the invention, the battery total capacity calculation device further comprises a battery capacity range determination module.
And the battery capacity range determining module is used for determining whether the total capacity of the battery exceeds a preset battery capacity range.
If yes, the historical battery total capacity is taken as the battery total capacity to be output.
And if not, outputting the total capacity of the battery.
In an alternative embodiment of the present invention, the capacity determining module 62 is further configured to calculate the battery capacity input to the battery under test or the battery under test output according to a battery capacity calculation formula.
The battery capacity calculation formula is as follows: ci=η×ζ.
Wherein eta is charge-discharge efficiency, i is battery current, and Ci is battery capacity input into or output from the battery to be tested.
In an alternative embodiment of the present invention, the obtaining module 63 is further configured to obtain the battery current, the historical remaining capacity, and the historical total battery capacity, and determine the current remaining capacity of the battery to be tested by the following formula.
Wherein, SOC is the current residual electric quantity, SOC 0 C is the historical residual electric quantity 0 I is the battery current, which is the historical battery total capacity.
In an alternative embodiment of the present invention, the battery total capacity calculation device further includes a remaining power calculation module.
And the remaining capacity calculation module is used for calculating the current remaining capacity at the next moment based on the battery total capacity at the current moment as the historical battery total capacity when the battery total capacity is calculated and recalculated at the next moment at the moment.
Example five
Fig. 5 is a schematic structural diagram of a battery total capacity computing system according to a fifth embodiment of the present invention, and as shown in fig. 5, the battery total capacity computing system includes a processor 70, a memory 71, an input device 72 and an output device 73; the number of processors 70 in the battery total capacity computing system may be one or more, one processor 70 being exemplified in fig. 5; the processor 70, memory 71, input device 72, and output device 73 in the battery total capacity computing system may be connected by a bus or other means, for example by a bus connection in fig. 5.
The memory 71 is a computer-readable storage medium that can be used to store software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the battery total capacity calculation method in the embodiment of the present invention (for example, the current acquisition module 61, the capacity determination module 62, the acquisition module 63, and the total capacity determination module 64 in the battery total capacity calculation device). The processor 70 executes various functional applications of the battery total capacity calculation system and data processing by executing software programs, instructions and modules stored in the memory 71, i.e., implements the battery total capacity calculation method described above.
The memory 71 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for functions; the storage data area may store data created according to the use of the terminal, etc. In addition, memory 71 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, memory 71 may further include memory remotely located with respect to processor 70, which may be connected to the battery total capacity computing system through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 72 may be used to receive entered numeric or character information and to generate key signal inputs related to user settings and function control of the battery total capacity computing system. The output means 73 may comprise a display device such as a display screen.
Example six
A sixth embodiment of the present invention also provides a storage medium containing computer-executable instructions, which when executed by a computer processor, are for performing a method of calculating a total capacity of a battery, the method comprising:
acquiring battery current input into a battery to be tested or output by the battery to be tested;
determining battery capacity input to the battery to be tested or output by the battery to be tested in the preset duration based on the battery current;
acquiring aging compensation information, temperature compensation information and current residual electric quantity of the battery to be tested;
and determining the total battery capacity of the battery to be tested based on the aging compensation information, the temperature compensation information, the input or output battery capacity and the current residual electric quantity of the battery to be tested.
Of course, the storage medium containing the computer executable instructions provided in the embodiments of the present invention is not limited to the method operations described above, and may also perform the related operations in the method for calculating the total capacity of the battery provided in any embodiment of the present invention.
From the above description of embodiments, it will be clear to a person skilled in the art that the present invention may be implemented by means of software and necessary general purpose hardware, but of course also by means of hardware, although in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, etc., and include several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments of the present invention.
It should be noted that, in the embodiment of the battery total capacity calculation device, each unit and module included are only divided according to the functional logic, but not limited to the above-mentioned division, so long as the corresponding functions can be implemented; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (7)
1. A method for calculating total capacity of a battery, comprising:
acquiring battery current input into a battery to be tested or output by the battery to be tested;
determining battery capacity input to the battery to be tested or output by the battery to be tested in a preset duration based on the battery current;
acquiring aging compensation information, temperature compensation information and current residual electric quantity of the battery to be tested;
determining the total battery capacity of the battery to be tested based on the aging compensation information, the temperature compensation information, the input or output battery capacity and the current residual electric quantity of the battery to be tested;
the obtaining the aging compensation information of the battery to be tested includes:
obtaining the internal resistance of the battery to be tested at the current momentThe total use time t of the battery to be tested at the current moment, wherein the current moment is the moment corresponding to the battery current;
the aging compensation information of the battery to be tested is determined by the following formula:
；
wherein,is the minimum value of preset battery internal resistance +.>Maximum value of permitted use time for preset battery, < >>For ageing compensation information +.>Alpha and beta are engineering coefficients measured by experiments for the current internal resistance of the battery;
before the obtaining the aging compensation information of the battery to be tested, the method comprises the following steps:
determining the internal resistance of the batteryWhether or not is greater than 2 times a preset minimum value of internal resistance of the battery +.>The method comprises the steps of carrying out a first treatment on the surface of the Or whether said total time of use t is greater than +.>；
If yes, the ageing compensation information is 0;
the obtaining the temperature compensation information of the battery to be measured includes:
acquiring the current temperature of the battery to be tested at the current momentDetermining temperature compensation information of the battery to be tested through the following formula;
；
wherein,for presetting the battery operating temperature, +.>For the current temperature of the battery, ">Is temperature compensation information;
the determining the total battery capacity of the battery to be measured based on the aging compensation information, the temperature compensation information, the input or output battery capacity and the current residual capacity of the battery to be measured comprises the following steps:
calculating the total capacity of the battery according to a total capacity calculation formula of the battery:
the calculation formula of the total capacity of the battery is as follows:；
wherein,k is capacity compensation information for the current remaining capacity, < ->The battery capacity is input or output, and C is the total battery capacity;
the capacity compensation information isThe method comprises the steps of carrying out a first treatment on the surface of the Wherein, gamma and epsilon are compensation coefficient weights obtained by experimental test according to the battery characteristics, and ++>、/>。
2. The method of calculating the total capacity of a battery according to claim 1, wherein before calculating the total capacity of the battery by a capacity calculation formula, the method further comprises:
determining whether the capacity compensation information exceeds a preset capacity compensation range;
if yes, taking the total capacity of the historical battery as the total capacity output of the battery;
and if not, outputting the total capacity of the battery.
3. The battery total capacity calculation method according to claim 2, wherein before the outputting of the battery total capacity, the method further comprises:
determining whether the total capacity of the battery exceeds a preset battery capacity range;
if yes, taking the total capacity of the historical battery as the total capacity of the battery to output;
and if not, outputting the total capacity of the battery.
4. The method according to claim 1, wherein the determining the battery capacity input to the battery under test or the battery output under test for the preset time period based on the battery current includes:
calculating the battery capacity input to the battery to be tested or the battery to be tested output through a battery capacity calculation formula:
the battery capacity calculation formula is as follows:；
wherein,for charge and discharge efficiency, i is battery current, < +.>And inputting the battery capacity of the battery to be tested or outputting the battery to be tested.
5. The method of claim 1, wherein the obtaining the current remaining capacity of the battery to be measured comprises:
acquiring the battery current, the historical residual capacity and the total capacity of the historical battery, and determining the current residual capacity of the battery to be tested according to the following formula;
；
wherein,for the current remaining power, ">Is the historical residual electric quantity>I is the battery current, which is the historical battery total capacity.
6. The method of calculating the total capacity of a battery according to claim 1, further comprising:
and when the total battery capacity is calculated and recalculated at the next moment of the moment, calculating the current residual capacity at the next moment based on the total battery capacity at the current moment as the historical total battery capacity.
7. A battery total capacity calculation apparatus, comprising:
a current acquisition module (61) for acquiring a battery current input into a battery to be measured or output by the battery to be measured;
a capacity determination module (62) for determining a battery capacity input to the battery under test or output from the battery under test for a preset duration based on the battery current;
the acquisition module (63) is used for acquiring aging compensation information, temperature compensation information and current residual electric quantity of the battery to be tested;
a total capacity determination module (64) for determining a total battery capacity of the battery to be measured based on the aging compensation information, the temperature compensation information, the input or output battery capacity, and the current remaining power of the battery to be measured;
an acquisition module (63) for acquiring the internal resistance of the battery to be measured at the current momentThe total use time t of the battery to be tested at the current moment, wherein the current moment is the moment corresponding to the battery current;
the aging compensation information of the battery to be tested is determined by the following formula:
；
wherein,is the minimum value of preset battery internal resistance +.>Maximum value of permitted use time for preset battery, < >>For ageing compensation information +.>Alpha and beta are engineering coefficients measured by experiments for the current internal resistance of the battery;
the battery total capacity calculation apparatus further includes an aging compensation determination module,
an aging compensation determining module for determining the internal resistance of the batteryWhether or not is greater than 2 times a preset minimum value of internal resistance of the battery +.>The method comprises the steps of carrying out a first treatment on the surface of the Or whether said total time of use t is greater than +.>；
If yes, the ageing compensation information is 0;
the acquisition module (63) is further configured to acquire a current temperature of the battery to be measured at a current timeDetermining temperature compensation information of the battery to be tested through the following formula;
；
wherein,for presetting the battery operating temperature, +.>For the current temperature of the battery, ">Is temperature compensation information;
the total capacity determination module (64) is further configured to calculate the total capacity of the battery according to a total capacity calculation formula of the battery: the calculation formula of the total capacity of the battery is as follows:
；
wherein,k is capacity compensation information for the current remaining capacity, < ->The battery capacity is input or output, and C is the total battery capacity; the capacity compensation information is +.>The method comprises the steps of carrying out a first treatment on the surface of the Wherein, gamma and epsilon are compensation coefficient weights obtained by experimental test according to the battery characteristics, and ++>、/>。
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| CN115097311B (en) * | 2022-06-20 | 2023-10-03 | 广东高标电子科技有限公司 | Method and device for calculating residual electric quantity of battery |
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