CN114184969B - Method and device for testing reversible self-discharge capacity loss of battery cell - Google Patents
Method and device for testing reversible self-discharge capacity loss of battery cell Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 102
- 230000002441 reversible effect Effects 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 47
- 230000032683 aging Effects 0.000 claims abstract description 60
- 238000000418 atomic force spectrum Methods 0.000 claims description 26
- 230000002427 irreversible effect Effects 0.000 claims description 20
- 230000015654 memory Effects 0.000 claims description 20
- 238000010280 constant potential charging Methods 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 11
- 238000007600 charging Methods 0.000 claims description 9
- 238000010277 constant-current charging Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 210000004027 cell Anatomy 0.000 description 193
- 230000015556 catabolic process Effects 0.000 description 5
- 238000006731 degradation reaction Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
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- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
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- 239000003792 electrolyte Substances 0.000 description 1
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- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- 238000010295 mobile communication Methods 0.000 description 1
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- 238000007086 side reaction Methods 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]
- G01R31/385—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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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a method and a device for testing reversible self-discharge capacity loss of a battery cell, wherein the method comprises the following steps: acquiring a first maximum capacity of a target battery cell in an initial state; performing self-discharge aging test on the target battery cell based on the set battery cell capacity influence parameters, and calculating the total self-discharge capacity loss of the target battery cell; calculating a second maximum capacity of the target battery cell after the self-discharge aging test; and determining the reversible self-discharge capacity loss of the target battery cell under the set battery cell capacity influence parameters based on the first maximum capacity, the second maximum capacity and the total self-discharge capacity loss. Therefore, the accurate calculation of the reversible self-discharge capacity loss is realized, the reversible self-discharge capacity of the battery cell at any temperature and in any state of SOC and during any storage time can be accurately obtained, and an accurate data base is provided for formulating a more reasonable battery use management strategy, more accurately predicting the service life of the battery and more efficiently optimizing the battery cell manufacturing process and improving the consistency of the battery cell.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a method and a device for testing reversible self-discharge capacity loss of a battery cell.
Background
The lithium ion battery has a self-discharge phenomenon in both storage and use states. The self-discharge not only causes the decrease of the battery capacity, but also causes the deterioration of the consistency of the battery cells. The battery pack contains tens or even hundreds of electric cells, and when the capacity of each electric cell and the consistency of the SoC state are poor, the capacity of the whole battery pack is quickly degraded, and the service life of the battery pack is finally quickly ended. The self-discharge of the battery cell is caused by various reasons, such as metal foreign matters introduced in the manufacturing process of the battery cell, lithium dendrites in the use process of the battery cell, side reactions of electrolyte and anode and cathode, and the like, which all cause the self-discharge phenomenon. The self-discharge can be classified into a reversible self-discharge and an irreversible self-discharge in terms of restorability after degradation of the capacity. The capacity loss caused by reversible self-discharge is called reversible capacity loss. The reversible capacity loss is influenced by factors such as the manufacturing process, the use condition and the like, has strong randomness, and is difficult to obtain.
At present, there are various methods for detecting the self-discharge of the battery cell, for example, the battery cell is discharged to the state of charge soc=0, then the battery cell is stored in different ambient temperatures, the change condition of the voltage value of the battery cell and the storage time are recorded, and the self-discharge rate of the battery is calculated through the change of the voltage and the storage time. However, the self-discharge capacity losses obtained by these methods are all total capacity losses, and it is not possible to distinguish between reversible self-discharge and irreversible self-discharge capacity losses.
Therefore, how to realize the quantitative calculation of reversible capacity loss caused by reversible self-discharge has important significance for researching the consistency degradation rule and life degradation rule of the battery, improving the manufacturing process of the battery core and the like.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a method and a device for testing reversible self-discharge capacity loss of a battery cell, so as to solve the problem that a quantitative calculation method for realizing reversible capacity loss caused by reversible self-discharge is lacking in the prior art.
The embodiment of the invention provides a reversible self-discharge capacity loss test method for a battery cell, which comprises the following steps:
acquiring a first maximum capacity of a target battery cell in an initial state;
performing self-discharge aging test on the target battery cell based on the set battery cell capacity influence parameters, and calculating total self-discharge capacity loss of the target battery cell;
calculating a second maximum capacity of the target battery cell after the self-discharge aging test;
and determining the reversible self-discharge capacity loss of the target battery cell under the set battery cell capacity influence parameters based on the first maximum capacity, the second maximum capacity and the total self-discharge capacity loss.
Optionally, the obtaining the first maximum capacity of the target cell in the initial state includes:
performing charge and discharge test on the target battery cell in an initial state, and determining a discharge electromotive force curve of the target battery cell in the initial state;
and calculating the first maximum capacity of the target battery cell in the initial state based on the charge cut-off voltage of the target battery cell and the discharge electromotive force curve of the target battery cell in the initial state.
Optionally, the setting the cell capacity influence parameter includes: the state of charge, temperature and constant voltage charge time, based on set cell capacity influence parameter carry out self discharge aging test to target cell, calculate the total self discharge capacity loss of target cell, include:
discharging the target battery cell constant current to a discharge cut-off voltage at the target temperature;
performing constant-current charging on the target battery cell to a target charge state, and then converting the target battery cell into constant-voltage charging;
after the constant voltage charge reaches the target constant voltage charge time, recording the total charge capacity;
discharging the target battery cell to a discharge cut-off voltage again in a constant current manner, and recording the discharge capacity;
and calculating the total self-discharge capacity loss of the target battery cell based on the total charge capacity and the discharge capacity.
Optionally, the calculating the second maximum capacity of the target cell after the self-discharge aging test includes:
performing charge-discharge test on the target battery cell after the self-discharge aging test, and determining a discharge electromotive force curve of the target battery cell after the self-discharge aging test;
and calculating a second maximum capacity of the target battery cell after the self-discharge aging test based on the charge cut-off voltage of the target battery cell and the discharge electromotive force curve of the target battery cell after the self-discharge aging test.
Optionally, the determining the reversible self-discharge capacity loss of the target cell under the set cell capacity influence parameter based on the first maximum capacity, the second maximum capacity, and the total self-discharge capacity loss includes:
calculating an irreversible self-discharge capacity loss of the target cell based on the first maximum capacity and the second maximum capacity;
the reversible self-discharge capacity loss is calculated based on the total self-discharge capacity loss and the irreversible self-discharge capacity loss.
Optionally, the initial state includes: the initial temperature, the charge and discharge test is performed on the target battery cell in the initial state, and the determination of the discharge electromotive force curve of the target battery cell in the initial state includes:
charging the target battery cell to a charging cut-off voltage at the initial temperature;
respectively carrying out charge and discharge tests of different discharge currents on the target battery cell to obtain a discharge voltage curve corresponding to the target battery cell under the different discharge currents;
and calculating a discharge electromotive force curve of the target battery cell in an initial state based on the discharge voltage curves corresponding to the target battery cell under different discharge currents.
Optionally, the performing a charge-discharge test on the target cell after the self-discharge aging test, determining a discharge electromotive force curve of the target cell after the self-discharge aging test includes:
charging the target battery cell after the self-discharge aging test to a charge cut-off voltage at the initial temperature;
respectively carrying out charge and discharge tests of different discharge currents on the target battery cell after the self-discharge aging test to obtain a discharge voltage curve corresponding to the aged target battery cell under the different discharge currents;
and calculating a discharge electromotive force curve of the target battery cell after the self-discharge aging test based on the discharge voltage curves corresponding to the aged target battery cell under different discharge currents.
The embodiment of the invention also provides a device for testing the reversible self-discharge capacity loss of the battery cell, which comprises the following components:
the acquisition module is used for acquiring the first maximum capacity of the target battery cell in the initial state;
the first processing module is used for carrying out self-discharge aging test on the target battery cell based on the set battery cell capacity influence parameter, and calculating the total self-discharge capacity loss of the target battery cell;
the second processing module is used for calculating a second maximum capacity of the target battery cell after the self-discharge aging test;
and the third processing module is used for determining the reversible self-discharge capacity loss of the target battery cell under the set battery cell capacity influence parameters based on the first maximum capacity, the second maximum capacity and the total self-discharge capacity loss.
The embodiment of the invention also provides electronic equipment, which comprises: the device comprises a memory and a processor, wherein the memory and the processor are in communication connection, the memory stores computer instructions, and the processor executes the computer instructions so as to execute the method provided by the embodiment of the invention.
The embodiment of the invention also provides a computer readable storage medium, which stores computer instructions for causing the computer to execute the method provided by the embodiment of the invention.
The technical scheme of the invention has the following advantages:
the embodiment of the invention provides a method and a device for testing reversible self-discharge capacity loss of a battery cell, which are used for acquiring a first maximum capacity of a target battery cell in an initial state; performing self-discharge aging test on the target battery cell based on the set battery cell capacity influence parameters, and calculating the total self-discharge capacity loss of the target battery cell; calculating a second maximum capacity of the target battery cell after the self-discharge aging test; and determining the reversible self-discharge capacity loss of the target battery cell under the set battery cell capacity influence parameters based on the first maximum capacity, the second maximum capacity and the total self-discharge capacity loss. The total self-discharge capacity of the battery cell is obtained by means of self-discharge testing of the battery cell, the maximum capacity of the battery cell in different aging states is tested, the irreversible self-discharge capacity loss of the battery cell is obtained, the reversible self-discharge capacity loss is obtained through calculation, and the accurate calculation of the reversible self-discharge capacity loss is realized, so that the reversible self-discharge capacity of the battery cell at any temperature, in any state of SOC and in any storage time can be accurately obtained, and an accurate data basis is provided for formulating a more reasonable battery use management strategy, more accurately predicting the service life of the battery and more efficiently optimizing the battery cell manufacturing process, and improving the consistency of the battery cell.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for testing reversible self-discharge capacity loss of a battery cell according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a self-discharge burn-in test according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing a specific operation process of the reversible self-discharge capacity loss test of the battery cell according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of a reversible self-discharge capacity loss test device of a battery cell according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The technical features of the different embodiments of the invention described below may be combined with one another as long as they do not conflict with one another.
At present, there are various methods for detecting the self-discharge of the battery cell, for example, the battery cell is discharged to a state of charge, that is, soc=0, and then the battery cell is stored in different ambient temperatures, the change condition of the voltage value of the battery cell and the storage time are recorded, and the self-discharge rate of the battery is calculated through the change of the voltage and the storage time. However, the self-discharge capacity losses obtained by these methods are all total capacity losses, and it is not possible to distinguish between reversible self-discharge and irreversible self-discharge capacity losses. Therefore, how to realize the quantitative calculation of reversible capacity loss caused by reversible self-discharge has important significance for researching the consistency degradation rule and life degradation rule of the battery, improving the manufacturing process of the battery core and the like.
Based on the above-mentioned problems, the embodiment of the invention provides a method for testing reversible self-discharge capacity loss of a battery cell, as shown in fig. 1, which specifically comprises the following steps:
step S101: and acquiring a first maximum capacity of the target battery cell in an initial state.
Wherein, the initial state includes: in the embodiment of the present invention, the initial temperature is described by taking the initial temperature as the ambient temperature T as an example, and in practical application, the initial temperature can be flexibly set according to the test requirement of the battery cell, which is not limited by the present invention.
Step S102: and carrying out self-discharge aging test on the target battery cell based on the set battery cell capacity influence parameters, and calculating the total self-discharge capacity loss of the target battery cell.
Wherein, set for electric core capacity influence parameter, include: state of charge, temperature, and constant voltage charge time. Specifically, the specific value of the capacity influence parameter of the battery cell can be flexibly set according to the reversible self-discharge capacity loss test requirement of the battery cell, if the battery cell needs to be tested, the battery cell is required to be tested at the ambient temperature T, the state of charge is SOC, the constant voltage charging time is N, namely the reversible self-discharge capacity loss of the battery cell is caused under the aging time of the battery cell placement, and the like.
Step S103: and calculating a second maximum capacity of the target battery cell after the self-discharge aging test.
In practical application, when the battery cell is placed for a period of time, the maximum capacity of the battery cell is reduced due to the influence of irreversible self-discharge capacity loss, so that the irreversible self-discharge capacity loss of the battery cell can be calculated by calculating the maximum capacity of the battery cell after the self-discharge aging test.
Step S104: and determining the reversible self-discharge capacity loss of the target battery cell under the set battery cell capacity influence parameters based on the first maximum capacity, the second maximum capacity and the total self-discharge capacity loss.
Specifically, the irreversible self-discharge capacity loss of the battery cell is calculated through the maximum capacity of the battery cell before and after the self-discharge aging test, and then the reversible self-discharge capacity loss of the target battery cell under the set battery cell capacity influence parameters can be calculated approximately accurately by combining the total self-discharge capacity loss.
By executing the steps, the method for testing the reversible self-discharge capacity loss of the battery cell obtains the total self-discharge capacity of the battery cell by performing the self-discharge test on the battery cell, then tests the maximum capacity of the battery cell in different aging states to obtain the irreversible self-discharge capacity loss of the battery cell, further calculates the reversible self-discharge capacity loss, realizes the accurate calculation of the reversible self-discharge capacity loss, can accurately obtain the reversible self-discharge capacity of the battery cell at any temperature and in any state of SOC and at any time, and provides an accurate data basis for formulating a more reasonable battery use management strategy, more accurately predicting the service life of the battery and more efficiently optimizing the battery cell manufacturing process and improving the consistency of the battery cell.
Specifically, in an embodiment, the step S101 specifically includes the following steps:
step S201: and (3) performing charge and discharge test on the target battery cell in the initial state, and determining a discharge electromotive force curve of the target battery cell in the initial state.
Specifically, the step S201 described above is to charge the target cell to the charge cutoff voltage by charging the target cell at the initial temperature; respectively carrying out charge and discharge tests of different discharge currents on the target battery cell to obtain a discharge voltage curve corresponding to the target battery cell under the different discharge currents; and calculating a discharge electromotive force curve of the target battery cell in an initial state based on the corresponding discharge voltage curves of the target battery cell under different discharge currents.
Illustratively, at ambient temperature T, the cell will charge to a charge cutoff voltage at a constant current of 1/3C, turning to constant voltage charge to a current of 0.05C; standing for 0.5 hour, and then performing constant current discharge at 0.1C to discharge cutoff voltage; the above procedure was repeated, changing the discharge current to 0.2c,0.3c,0.5c in this order. After the discharge voltage curves under different multiplying powers are obtained, calculating a voltage curve when the discharge current is constant equal to 0 through a regression algorithm, wherein the voltage curve at the moment is the discharge electromotive force curve, namely the EMF, of the battery cell in an initial state.
Step S202: and calculating the first maximum capacity of the target battery cell in the initial state based on the charge cut-off voltage of the target battery cell and the discharge electromotive force curve of the target battery cell in the initial state.
Specifically, the capacity corresponding to the charging cut-off voltage on the EMF curve is the first maximum capacity of the target cell in the initial state.
Specifically, in an embodiment, the step S102 specifically includes the following steps:
constant-current discharging the target battery cell to a discharge cut-off voltage at a target temperature; performing constant-current charging on the target battery cell to a target charge state, and then converting the target battery cell into constant-voltage charging; after the constant voltage charge reaches the target constant voltage charge time, recording the total charge capacity; discharging the target battery cell to a discharge cut-off voltage again in a constant current manner, and recording the discharge capacity; based on the total charge capacity and discharge capacity, the total self-discharge capacity loss of the target cell is calculated.
The target temperature, the target state of charge and the target constant voltage charging time can be flexibly set according to the reversible self-discharge capacity test requirement of the battery cell, and the invention is not limited to this.
Illustratively, as shown in FIG. 2, at ambient temperature T, the cell is discharged to a cut-off voltage at a constant current of 1/3C, and after standing for 5 minutes, the constant current is charged to any SoC (x i ) State, then turn to constant voltage charge for N days (N>30 days), the total charge capacity was recorded, and the charge current was smaller and smaller during constant voltage charging, and the battery was also closer and closer to the equilibrium state. If the battery does not have a self-discharging process, the constant voltage charging current is reduced to 0; if there is a self-discharging process in the battery, the current is greater than 0 during constant voltage charging, and the charging current is used to compensate the voltage drop caused by self-discharging. After constant voltage charging for N days, discharge was performed at 1/3C constant current to a cutoff voltage, and discharge capacity was recorded.
The total self-discharge capacity loss of the target cell is calculated by the following formula (1):
ΔQ t ＝Q oh -Q d (1)
wherein DeltaQ t Represents the total self-discharge capacity loss, Q ch Represents the total charge capacity, Q d The discharge capacity is shown.
Therefore, the total self-discharge capacity loss of the target battery cell is calculated through the self-discharge aging test, an accurate data basis is provided for the subsequent calculation of the reversible self-discharge capacity loss of the target battery cell, and the accuracy of the final reversible self-discharge capacity loss calculation result is further improved.
Specifically, in one embodiment, the step S103 specifically includes the following steps:
step S401: and carrying out charge and discharge test on the target battery cell after the self-discharge aging test, and determining a discharge electromotive force curve of the target battery cell after the self-discharge aging test.
Specifically, step S401 charges the target cell after the self-discharge aging test to a charge cutoff voltage at an initial temperature; respectively carrying out charge and discharge tests of different discharge currents on the target battery cell after the self-discharge aging test to obtain a discharge voltage curve corresponding to the aged target battery cell under the different discharge currents; and calculating a discharge electromotive force curve of the target battery cell after the self-discharge aging test based on the discharge voltage curves corresponding to the aged target battery cell under different discharge currents.
Illustratively, at an ambient temperature T, the battery cell after the self-discharge aging test is charged to a charge cut-off voltage at a constant current of 1/3C, and the current is charged to 0.05C from a constant voltage; standing for 0.5 hour, and then performing constant current discharge at 0.1C to discharge cutoff voltage; the above procedure was repeated, changing the discharge current to 0.2c,0.3c,0.5c in this order. After the discharge voltage curves under different multiplying powers are obtained, calculating a voltage curve when the discharge current is constant equal to 0 through a regression algorithm, wherein the voltage curve at the moment is the discharge electromotive force curve of the target battery cell after the self-discharge aging test. The specific process is the same as the principle of the discharge electromotive force curve of the target cell in the initial state, and no description is repeated here.
Step S402: and calculating a second maximum capacity of the target battery cell after the self-discharge aging test based on the charge cut-off voltage of the target battery cell and the discharge electromotive force curve of the target battery cell after the self-discharge aging test.
Specifically, the capacity corresponding to the charge cutoff voltage on the discharge electromotive force curve of the battery cell after the self-discharge aging test is the second maximum capacity of the target battery cell after the self-discharge aging test.
Specifically, in an embodiment, the step S104 specifically includes the following steps:
step S501: based on the first maximum capacity and the second maximum capacity, an irreversible self-discharge capacity loss of the target cell is calculated.
Specifically, the irreversible self-discharge capacity loss of the target cell is calculated by the following formula (2):
wherein DeltaQ ir Indicating an irreversible self-discharge capacity loss,representing a first maximum capacity, +.>Representing a second maximum capacity.
Step S502: based on the total self-discharge capacity loss and the irreversible self-discharge capacity loss, the reversible self-discharge capacity loss was calculated.
Specifically, the reversible self-discharge capacity loss of the target cell is calculated by the following formula (3):
ΔQ re ＝ΔQ t -ΔQ ir (3)
wherein DeltaQ re Represents reversible self-discharge capacity loss, deltaQ t Represents the total self-discharge capacity loss, deltaQ ir Indicating irreversible self-discharge capacity loss.
Since the EMF curve is the voltage curve when the battery is in equilibrium (when the current is equal to 0), the calculated capacity from the EMF curve can be considered the actual capacity of the cell, as well as the maximum capacity that the cell can release. The irreversible self-discharge capacity of the battery can be calculated through the maximum capacity in the initial state and the maximum capacity after the self-discharge aging test.
In the embodiment of the invention, in the self-discharge aging test, constant voltage charging is selected to be performed in different SoCs, so that the self-discharge capacity of the battery cell in different SoCs can be obtained; the self-discharge capacity of the battery cell under different time can be obtained by adjusting the constant-voltage charging time; and the self-discharge capacity of the battery cell at different temperatures can be obtained by selecting different test temperatures. As shown in fig. 3, the method for testing the reversible self-discharge capacity loss of the battery cell provided by the implementation of the invention can obtain corresponding reversible self-discharge capacities under the above conditions respectively. The flexibility of the reversible self-discharge capacity loss test of the core is greatly improved, and an accurate data basis is further provided for formulating a more reasonable battery use management strategy, more accurately predicting the service life of the battery and more efficiently optimizing the manufacturing process of the battery core, so that the consistency of the battery core is improved.
By executing the steps, the method for testing the reversible self-discharge capacity loss of the battery cell obtains the total self-discharge capacity of the battery cell by performing the self-discharge test on the battery cell, then tests the maximum capacity of the battery cell in different aging states to obtain the irreversible self-discharge capacity loss of the battery cell, further calculates the reversible self-discharge capacity loss, realizes the accurate calculation of the reversible self-discharge capacity loss, can accurately obtain the reversible self-discharge capacity of the battery cell at any temperature and in any state of SOC and at any time, and provides an accurate data basis for formulating a more reasonable battery use management strategy, more accurately predicting the service life of the battery and more efficiently optimizing the battery cell manufacturing process and improving the consistency of the battery cell.
The embodiment of the invention also provides a device for testing the reversible self-discharge capacity loss of the battery cell, as shown in fig. 4, which comprises:
the obtaining module 101 is configured to obtain a first maximum capacity of the target cell in an initial state. For details, refer to the related description of step S101 in the above method embodiment, and no further description is given here.
The first processing module 102 is configured to perform a self-discharge aging test on the target battery cell based on the set battery cell capacity influence parameter, and calculate a total self-discharge capacity loss of the target battery cell. For details, refer to the related description of step S102 in the above method embodiment, and no further description is given here.
And the second processing module 103 is used for calculating a second maximum capacity of the target battery cell after the self-discharge aging test. For details, see the description of step S103 in the above method embodiment, and the details are not repeated here.
The third processing module 104 is configured to determine a reversible self-discharge capacity loss of the target cell under the set cell capacity influence parameter based on the first maximum capacity, the second maximum capacity, and the total self-discharge capacity loss. For details, refer to the related description of step S104 in the above method embodiment, and no further description is given here.
Through the cooperation of the components, the device for testing the reversible self-discharge capacity loss of the battery cell provided by the embodiment of the invention obtains the total self-discharge capacity of the battery cell by performing the self-discharge test on the battery cell, then tests the maximum capacity of the battery cell in different aging states to obtain the irreversible self-discharge capacity loss of the battery cell, further calculates the reversible self-discharge capacity loss, realizes the accurate calculation of the reversible self-discharge capacity loss, and can accurately obtain the reversible self-discharge capacity of the battery cell at any temperature and at any state of SOC and at any time of storage, thereby providing an accurate data basis for formulating a more reasonable battery use management strategy, more accurately predicting the service life of the battery cell and more efficiently optimizing the battery cell manufacturing process and improving the consistency of the battery cell.
Further functional descriptions of the above respective modules are the same as those of the above corresponding method embodiments, and are not repeated here.
There is also provided in accordance with an embodiment of the present invention, an electronic device, as shown in fig. 5, which may include a processor 901 and a memory 902, wherein the processor 901 and the memory 902 may be connected via a bus or otherwise, as exemplified by the bus connection in fig. 5.
The processor 901 may be a central processing unit (Central Processing Unit, CPU). The processor 901 may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination thereof.
The memory 902 is used as a non-transitory computer readable storage medium for storing non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the methods in the method embodiments of the present invention. The processor 901 executes various functional applications of the processor and data processing, i.e., implements the methods in the above-described method embodiments, by running non-transitory software programs, instructions, and modules stored in the memory 902.
The memory 902 may include a storage program area and a storage data area, wherein the storage program area may store an operating device, at least one application program required for a function; the storage data area may store data created by the processor 901, and the like. In addition, the memory 902 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 902 optionally includes memory remotely located relative to processor 901, which may be connected to processor 901 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
One or more modules are stored in the memory 902 that, when executed by the processor 901, perform the methods of the method embodiments described above.
The specific details of the electronic device may be correspondingly understood by referring to the corresponding related descriptions and effects in the above method embodiments, which are not repeated herein.
It will be appreciated by those skilled in the art that implementing all or part of the above-described embodiment method may be implemented by a computer program to instruct related hardware, and the program may be stored in a computer readable storage medium, and the program may include the above-described embodiment method when executed. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a Flash Memory (Flash Memory), a Hard Disk (HDD), or a Solid State Drive (SSD); the storage medium may also comprise a combination of memories of the kind described above.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations are within the scope of the invention as defined by the appended claims.
Claims (9)
1. The method for testing the reversible self-discharge capacity loss of the battery cell is characterized by comprising the following steps of:
acquiring a first maximum capacity of a target battery cell in an initial state;
performing self-discharge aging test on the target battery cell based on the set battery cell capacity influence parameters, and calculating total self-discharge capacity loss of the target battery cell;
calculating a second maximum capacity of the target battery cell after the self-discharge aging test;
determining a reversible self-discharge capacity loss of the target battery cell under a set battery cell capacity influence parameter based on the first maximum capacity, the second maximum capacity and the total self-discharge capacity loss;
the setting of the cell capacity influence parameter includes: the state of charge, temperature and constant voltage charge time, based on set cell capacity influence parameter carry out self discharge aging test to target cell, calculate the total self discharge capacity loss of target cell, include:
discharging the target battery cell constant current to a discharge cut-off voltage at the target temperature;
performing constant-current charging on the target battery cell to a target charge state, and then converting the target battery cell into constant-voltage charging;
after the constant voltage charge reaches the target constant voltage charge time, recording the total charge capacity;
discharging the target battery cell to a discharge cut-off voltage again in a constant current manner, and recording the discharge capacity;
and calculating the total self-discharge capacity loss of the target battery cell based on the difference value of the total charge capacity and the discharge capacity.
2. The method of claim 1, wherein the obtaining the first maximum capacity of the target cell in the initial state comprises:
performing charge and discharge test on the target battery cell in an initial state, and determining a discharge electromotive force curve of the target battery cell in the initial state;
and calculating the first maximum capacity of the target battery cell in the initial state based on the charge cut-off voltage of the target battery cell and the discharge electromotive force curve of the target battery cell in the initial state.
3. The method of claim 2, wherein calculating the second maximum capacity of the target cell after the self-discharge aging test comprises:
performing charge-discharge test on the target battery cell after the self-discharge aging test, and determining a discharge electromotive force curve of the target battery cell after the self-discharge aging test;
and calculating a second maximum capacity of the target battery cell after the self-discharge aging test based on the charge cut-off voltage of the target battery cell and the discharge electromotive force curve of the target battery cell after the self-discharge aging test.
4. The method of claim 1, wherein the determining the reversible self-discharge capacity loss of the target cell at the set cell capacity-affecting parameter based on the first maximum capacity, the second maximum capacity, and the total self-discharge capacity loss comprises:
calculating an irreversible self-discharge capacity loss of the target cell based on the first maximum capacity and the second maximum capacity;
the reversible self-discharge capacity loss is calculated based on the total self-discharge capacity loss and the irreversible self-discharge capacity loss.
5. A method according to claim 3, wherein the initial state comprises: the initial temperature, the charge and discharge test is performed on the target battery cell in the initial state, and the determination of the discharge electromotive force curve of the target battery cell in the initial state includes:
charging the target battery cell to a charging cut-off voltage at the initial temperature;
respectively carrying out charge and discharge tests of different discharge currents on the target battery cell to obtain a discharge voltage curve corresponding to the target battery cell under the different discharge currents;
and calculating a discharge electromotive force curve of the target battery cell in an initial state based on the discharge voltage curves corresponding to the target battery cell under different discharge currents.
6. The method of claim 5, wherein said performing a charge-discharge test on said target cell after a self-discharge aging test, determining a discharge electromotive force curve of said target cell after a self-discharge aging test, comprises:
charging the target battery cell after the self-discharge aging test to a charge cut-off voltage at the initial temperature;
respectively carrying out charge and discharge tests of different discharge currents on the target battery cell after the self-discharge aging test to obtain a discharge voltage curve corresponding to the aged target battery cell under the different discharge currents;
and calculating a discharge electromotive force curve of the target battery cell after the self-discharge aging test based on the discharge voltage curves corresponding to the aged target battery cell under different discharge currents.
7. The utility model provides a reversible self discharge capacity loss testing arrangement of electric core which characterized in that includes:
the acquisition module is used for acquiring the first maximum capacity of the target battery cell in the initial state;
the first processing module is used for carrying out self-discharge aging test on the target battery cell based on the set battery cell capacity influence parameter, and calculating the total self-discharge capacity loss of the target battery cell; the setting of the cell capacity influence parameter includes: the state of charge, temperature and constant voltage charge time, based on set cell capacity influence parameter carry out self discharge aging test to target cell, calculate the total self discharge capacity loss of target cell, include: discharging the target battery cell constant current to a discharge cut-off voltage at the target temperature; performing constant-current charging on the target battery cell to a target charge state, and then converting the target battery cell into constant-voltage charging; after the constant voltage charge reaches the target constant voltage charge time, recording the total charge capacity; discharging the target battery cell to a discharge cut-off voltage again in a constant current manner, and recording the discharge capacity; calculating the total self-discharge capacity loss of the target battery cell based on the difference between the total charge capacity and the discharge capacity;
the second processing module is used for calculating a second maximum capacity of the target battery cell after the self-discharge aging test;
and the third processing module is used for determining the reversible self-discharge capacity loss of the target battery cell under the set battery cell capacity influence parameters based on the first maximum capacity, the second maximum capacity and the total self-discharge capacity loss.
8. An electronic device, comprising:
a memory and a processor, the memory and the processor being communicatively coupled to each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the method of any of claims 1-6.
9. A computer readable storage medium having stored thereon computer instructions for causing a computer to perform the method of any one of claims 1-6.
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