CN113671396A - Method and device for determining service life of battery cell - Google Patents
Method and device for determining service life of battery cell Download PDFInfo
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- CN113671396A CN113671396A CN202110920839.7A CN202110920839A CN113671396A CN 113671396 A CN113671396 A CN 113671396A CN 202110920839 A CN202110920839 A CN 202110920839A CN 113671396 A CN113671396 A CN 113671396A
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- 238000000034 method Methods 0.000 title claims abstract description 71
- 230000000875 corresponding effect Effects 0.000 claims description 36
- 238000012360 testing method Methods 0.000 claims description 9
- 230000002596 correlated effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000008707 rearrangement Effects 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]
- G01R31/392—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]
- G01R31/385—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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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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
Abstract
The embodiment of the invention discloses a method and a device for determining the service life of a battery cell, wherein the method for determining the service life of the battery cell comprises the following steps: acquiring the minimum value of the negative electrode potential of the battery cell to be tested in the quick charging process; when the minimum value of the negative electrode potential is larger than or equal to a value corresponding to the preset reserved potential, performing quick charge circulation on the electric core to be tested, and acquiring the minimum value of the negative electrode potential of the electric core to be tested every preset cycle number in the quick charge circulation process until the negative electrode potential is smaller than zero; and determining the service life of the battery cell to be tested according to the minimum value of the negative electrode potential of every preset cycle and the cycle times of the quick charge cycle of the battery cell to be tested. The method and the device for determining the service life of the battery cell provided by the embodiment of the invention can improve the reliability of determining the service life of the battery cell.
Description
Technical Field
The embodiment of the invention relates to a battery testing technology, in particular to a method and a device for determining the service life of a battery core.
Background
Batteries are used as power supply devices for various electronic devices such as mobile phones and computers, and are increasingly widely used. The performance of the battery is a factor that affects the normal power supply of the battery and even the normal operation of the electronic device in which the battery is located, and the battery cell is an important component of the battery, so that the service life of the battery cell also becomes an important index of the performance of the battery, and the service life of the battery is affected, therefore, the service life of the battery cell of the battery needs to be reliably tested.
At present, in a conventional method for determining the service life of a battery cell, the service life of the battery cell is usually determined according to a capacity change corresponding to a voltage, the capacity change and a cycle number in a cycle test process of normal charging and discharging, but for quick charging of the battery cell, a factor influencing the service life of the battery cell is mainly a lithium precipitation problem of a negative electrode of the battery cell, and if the service life of the battery cell is still determined through the capacity change, reliability of determining the service life of the battery cell is influenced.
Disclosure of Invention
The embodiment of the invention provides a method and a device for determining the service life of a battery cell, which are used for improving the reliability of determining the service life of the battery cell.
In a first aspect, an embodiment of the present invention provides a method for determining a lifetime of a battery cell, including:
acquiring the minimum value of the negative electrode potential of the battery cell to be tested in the quick charging process;
when the minimum value of the negative electrode potential is larger than or equal to a value corresponding to the preset reserved potential, performing quick charge circulation on the electric core to be tested, and acquiring the minimum value of the negative electrode potential of the electric core to be tested every preset cycle number in the quick charge circulation process until the negative electrode potential is smaller than zero;
and determining the service life of the battery cell to be tested according to the minimum value of the negative electrode potential of every preset cycle and the cycle times of the quick charge cycle of the battery cell to be tested.
Optionally, determining the service life of the to-be-tested battery cell according to the minimum value of the negative electrode potential of every preset cycle and the cycle of the to-be-tested battery cell for fast charge cycle, including:
determining the corresponding relation between the cycle times and the minimum value of the negative electrode potential according to the minimum value of the negative electrode potential of the cell to be tested every preset cycle time and the cycle times of the cell to be tested for performing quick charge cycle;
and fitting the minimum value of the negative electrode potential and the cycle number of every preset cycle number according to the corresponding relation, and determining the service life of the battery cell to be tested.
Optionally, fitting the minimum value of the negative electrode potential and the cycle number of every preset cycle number to determine the service life of the battery cell to be tested, including:
fitting the minimum value of the negative electrode potential every preset cycle and the cycle to obtain a fitting curve;
and determining the cycle number when the negative electrode potential is zero in the fitting curve according to the fitting curve, and taking the cycle number at the moment as the service life of the battery cell to be tested.
Optionally, after determining the lifetime of the battery cell to be tested, the method includes:
determining the negative electrode potential when the cycle number corresponding to the preset target life is zero according to the fitting curve and the preset target life;
and taking the negative electrode potential when the cycle number corresponding to the preset target life is zero as the preset reserved potential.
Optionally, before obtaining the minimum value of the negative electrode potential of the electric core to be tested in the fast charging process, the method includes:
performing quick charge on the electric core to be tested according to a preset quick charge strategy to obtain the minimum value of the negative electrode potential of the electric core to be tested;
and taking the minimum value of the negative electrode potential of the test battery cell as a preset reserved potential.
Optionally, after determining the lifetime of the battery cell to be tested, the method includes:
comparing the preset target life with the life of the battery cell to be tested according to the preset target life;
and if the preset target service life is longer than the service life of the battery cell to be tested, determining a preset reserved potential according to the preset target service life.
Optionally, the preset reserved potential is positively correlated with the service life of the battery cell to be tested.
Optionally, the preset reserved potential is greater than zero.
In a second aspect, an embodiment of the present invention further provides a device for determining a lifetime of a battery cell, including:
the potential acquisition module is used for acquiring the minimum value of the negative electrode potential of the battery cell to be tested in the quick charging process;
the battery cell quick-charging module is used for performing quick-charging circulation on the battery cell to be tested when the minimum value of the negative electrode potential is greater than or equal to a value corresponding to the preset reserved potential, and acquiring the minimum value of the negative electrode potential of the battery cell to be tested every preset cycle number in the quick-charging circulation process until the negative electrode potential is less than zero;
and the service life determining module is used for determining the service life of the to-be-tested battery cell according to the minimum value of the negative electrode potential of every preset cycle and the cycle times of the to-be-tested battery cell for quick charge cycle.
Optionally, the lifetime determination module includes:
the relation determining unit is used for determining the corresponding relation between the cycle times and the minimum value of the negative electrode potential according to the minimum value of the negative electrode potential of the to-be-tested battery cell every preset cycle time and the cycle times of the to-be-tested battery cell for performing quick charge cycle;
and the service life determining unit is used for fitting the minimum value of the negative electrode potential and the cycle number of every preset cycle number according to the corresponding relation, and determining the service life of the battery cell to be tested.
According to the method and the device for determining the service life of the battery cell, provided by the embodiment of the invention, the minimum value of the negative electrode potential of the battery cell to be tested in the quick charging process is obtained; when the minimum value of the negative electrode potential is larger than or equal to a value corresponding to the preset reserved potential, performing quick charge circulation on the electric core to be tested, and acquiring the minimum value of the negative electrode potential of the electric core to be tested every preset cycle number in the quick charge circulation process until the negative electrode potential is smaller than zero; and determining the service life of the battery cell to be tested according to the minimum value of the negative electrode potential of every preset cycle and the cycle times of the quick charge cycle of the battery cell to be tested. Compared with the existing method for determining the service life of the battery core, the method and the device for determining the service life of the battery core provided by the embodiment determine the service life of the battery core to be tested according to the minimum value of the negative electrode potential every preset cycle number and the cycle number of the quick charge cycle of the battery core to be tested, solve the problem that the determination reliability of the service life of the battery core is influenced by determining the service life of the battery core through capacity change for the quick charge of the battery core, and therefore can improve the determination reliability of the service life of the battery core.
Drawings
Fig. 1 is a flowchart of a method for determining a lifetime of a battery cell according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for determining a lifetime of a battery cell according to a second embodiment of the present invention;
FIG. 3 is a schematic diagram of the potential variation of the negative electrode according to the second embodiment of the present invention;
FIG. 4 is a schematic diagram of a fitting curve provided in the second embodiment of the present invention;
fig. 5 is a block diagram of a structure of a device for determining a lifetime of a battery cell according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a method for determining a battery life according to an embodiment of the present invention, where the embodiment is applicable to aspects such as testing a battery life, and the method may be executed by a device for determining a battery life, where the device may be implemented by software and/or hardware, and the device may be integrated into an electronic device, such as a computer, having a function of determining a battery life, and the method specifically includes the following steps:
and step 110, acquiring the minimum value of the negative electrode potential of the battery cell to be tested in the quick charging process.
The actual potential of the negative electrode can be continuously reduced along with the continuous increase of polarization and internal resistance in the quick charging process of the battery cell to be tested. The device for determining the service life of the battery cell can be electrically connected with the three electrodes of the battery cell to be tested so as to acquire the negative electrode potential of the battery cell in the quick charging process in real time and monitor the change of the negative electrode potential, thereby determining the minimum value of the negative electrode potential.
And 120, when the minimum value of the negative electrode potential is greater than or equal to a value corresponding to the preset reserved potential, performing fast charge cycle on the to-be-tested electric core, and acquiring the minimum value of the negative electrode potential of the to-be-tested electric core every preset cycle number in the fast charge cycle process until the negative electrode potential is less than zero.
The preset reserved potential can be stored in the device for determining the service life of the battery cell in advance, and for the lithium ion battery, if the negative electrode potential of the battery cell is lower than 0V, the risk of lithium deposition can occur, so that the preset reserved potential is usually greater than 0V. And when the minimum value of the negative electrode potential is not less than the potential value of the preset reserved potential, such as 20mV, performing quick charge circulation on the test core to be tested, namely discharging after finishing quick charge, and continuously and quickly charging after finishing discharging, so that the circulation is performed. And recording the minimum value of the negative electrode potential in 50 cycles if every 50 cycles until the negative electrode potential is less than zero.
It should be noted that the magnitude of the preset reserved potential and the specific value of the preset cycle number may be determined according to actual requirements, and are not limited herein.
And step 130, determining the service life of the battery cell to be tested according to the minimum value of the negative electrode potential every preset cycle and the cycle of the quick charge cycle of the battery cell to be tested.
Specifically, the service life of the battery cell in this embodiment is the cycle life of the battery cell for performing the fast charging, that is, the number of times that the battery cell can perform the fast charging cycle. The method comprises the steps of determining the corresponding relation between the cycle number and the minimum value of the negative electrode potential of the to-be-tested battery cell every preset cycle number according to the minimum value of the negative electrode potential of the to-be-tested battery cell and the cycle number of the to-be-tested battery cell for quick charge cycle, fitting the minimum value of the negative electrode potential and the cycle number of every preset cycle number according to the corresponding relation to obtain a fitting curve, determining the cycle number when the negative electrode potential is zero in the fitting curve according to the fitting curve, and taking the cycle number at the moment as the service life of the to-be-tested battery cell.
In the method for determining the service life of the electrical core provided in this embodiment, the minimum value of the negative electrode potential of the electrical core to be tested in the quick charge process is obtained, when the minimum value of the negative electrode potential is greater than or equal to a value corresponding to the preset reserved potential, the quick charge cycle is performed on the electrical core to be tested, the minimum value of the negative electrode potential of the electrical core to be tested every preset cycle number in the quick charge cycle process is obtained, until the negative electrode potential is less than zero, and the service life of the electrical core to be tested is determined according to the minimum value of the negative electrode potential every preset cycle number and the cycle number of the electrical core to be tested performing the quick charge cycle. Compared with the existing method for determining the service life of the battery core, the method for determining the service life of the battery core provided by the embodiment determines the service life of the battery core to be tested according to the minimum value of the negative electrode potential every preset cycle number and the cycle number of the quick charge cycle of the battery core to be tested, solves the problem that the determination reliability of the service life of the battery core is influenced by determining the service life of the battery core through capacity change for the quick charge of the battery core, and can improve the determination reliability of the service life of the battery core.
Example two
Fig. 2 is a flowchart of a method for determining a battery life according to a second embodiment of the present invention, where this embodiment is applicable to aspects such as testing a battery life, and the method may be executed by a device for determining a battery life, where the device may be implemented by software and/or hardware, and the device may be integrated into an electronic device, such as a computer, having a function of determining a battery life, and the method specifically includes the following steps:
and step 210, obtaining the minimum value of the negative electrode potential of the battery cell to be tested in the quick charging process.
The actual potential of the negative electrode can be continuously reduced along with the continuous increase of polarization and internal resistance in the quick charging process of the battery cell to be tested. The device for determining the service life of the battery cell can be electrically connected with the three electrodes of the battery cell to be tested so as to acquire the negative electrode potential of the battery cell in the quick charging process in real time and monitor the change of the negative electrode potential, thereby determining the minimum value of the negative electrode potential.
In addition, before the minimum value of the negative electrode potential of the electric core to be tested in the quick charging process is obtained, the electric core to be tested can be quickly charged according to a preset quick charging strategy, and the minimum value of the negative electrode potential of the electric core to be tested is obtained; and taking the minimum value of the negative electrode potential of the test battery cell as a preset reserved potential.
Fig. 3 is a schematic diagram of a change in negative electrode potential provided in an embodiment of the present invention, in a process of fast charging an electric core, the electric core may pass through a plurality of charging stages, fig. 3 exemplarily shows four charging stages a to D, an initial stage, that is, the stage a employs a large current for charging, when the negative electrode potential reaches 20mV, the current is reduced to continue charging (stage B), the negative electrode potential is increased and then decreased, when the negative electrode potential reaches 20mV, the current is further reduced to continue charging (stage C), the change in negative electrode potential is shown in fig. 3 until the charging ratio of the electric core reaches 80%, and finally the electric core is fully charged with a constant current and a constant voltage of 0.5C (stage D). The overall trend of the negative electrode potential is gradually reduced until the minimum value is 20mV, and then 20mV can be used as the potential value of the reserved potential.
And step 220, when the minimum value of the negative electrode potential is greater than or equal to a value corresponding to the preset reserved potential, performing fast charge circulation on the to-be-tested electric core, and acquiring the minimum value of the negative electrode potential of the to-be-tested electric core every preset cycle number in the fast charge circulation process until the negative electrode potential is less than zero.
The preset reserved potential is larger than zero, and the size of the preset reserved potential is positively correlated with the service life of the battery cell to be tested. And when the minimum value of the negative electrode potential is not less than the potential value of the preset reserved potential, performing fast charge circulation on the to-be-tested core, and recording the minimum value of the negative electrode potential in 50 cycles every 50 cycles until the negative electrode potential is less than zero.
And step 230, determining the corresponding relation between the cycle times and the minimum value of the negative electrode potential according to the minimum value of the negative electrode potential of the to-be-tested battery cell every preset cycle time and the cycle times of the to-be-tested battery cell for performing quick charge cycle.
Illustratively, the minimum value of the negative electrode potential is recorded every 50 cycles, if the cycle number is 1000 times in total, 20 negative electrode potentials can be obtained, and the data of each negative electrode potential corresponds to a range of the cycle number, such as the minimum value of the negative electrode potential in 0-50 times and the minimum value of the negative electrode potential in 50-100 times, so as to obtain the corresponding relation between the determined cycle number and the minimum value of the negative electrode potential.
And 240, fitting the minimum value of the negative electrode potential and the cycle number every preset cycle number according to the corresponding relation to obtain a fitting curve.
Specifically, the minimum value of the negative electrode potential every preset cycle number is gradually decreased with the increase of the cycle number, and the decreasing speed is generally slow and then fast. During fitting, a fitting curve can be obtained by adopting a common fitting mode such as a least square method, and the specific fitting process can refer to the fitting process of the existing fitting mode and is not repeated here.
And 250, determining the cycle number when the negative electrode potential in the fitting curve is zero according to the fitting curve, and taking the cycle number at the moment as the service life of the battery cell to be tested.
Exemplarily, fig. 4 is a schematic diagram of a fitted curve provided by the second embodiment of the present invention, and it can be seen from fig. 4 that the minimum value of the anode potential decreases with the increase of the cycle number, and the decreasing speed increases first and then slowly. When the minimum value of the negative electrode potential on the curve is zero, the cycle number at this time is the service life of the battery cell to be tested, for example, 1500 times.
In addition, after the service life of the battery cell to be tested is determined, the negative pole potential when the cycle number corresponding to the preset target service life is zero can be determined according to the fitting curve and the preset target service life, such as 2000 times; and taking the negative electrode potential when the cycle number corresponding to the preset target life is zero as the preset reserved potential.
In one embodiment, after determining the lifetime of the battery cell to be tested, the preset target lifetime may be compared with the lifetime of the battery cell to be tested according to the preset target lifetime; and if the preset target service life is longer than the service life of the battery cell to be tested, determining a preset reserved potential according to the preset target service life. Specifically, referring to fig. 4, if the preset target life is 2000 times, and the intersection point between the fitting curve and the horizontal axis is 1500 times, that is, the actual life is 1500 times, the fitting curve is shifted to the right until the intersection point between the fitting curve and the horizontal axis is 2000 times, and at this time, the numerical value corresponding to the intersection point between the fitting curve and the vertical axis may be used as the potential value of the preset reserved potential.
According to the method for determining the service life of the battery cell, the minimum value of the negative electrode potential and the cycle number of every preset cycle number are fitted according to the corresponding relation between the cycle number and the minimum value of the negative electrode potential to obtain a fitting curve, the cycle number when the negative electrode potential is zero in the fitting curve is determined according to the fitting curve, the cycle number at the moment is used as the service life of the battery cell to be tested, the problem that the reliability of determining the service life of the battery cell is influenced by the quick charging of the battery cell and the determination of the service life of the battery cell through the capacity change is solved, and therefore the reliability of determining the service life of the battery cell can be improved.
EXAMPLE III
Fig. 5 is a block diagram of a device for determining a lifetime of a battery cell according to a third embodiment of the present invention, where the device includes a potential obtaining module 310, a battery cell fast-charging module 320, and a lifetime determining module 330; the potential obtaining module 310 is configured to obtain a minimum value of a negative electrode potential of the battery cell to be tested in the quick charging process; the battery cell fast charging module 320 is configured to perform fast charging cycle on the battery cell to be tested when the minimum value of the negative electrode potential is greater than or equal to a value corresponding to a preset reserved potential, and acquire the minimum value of the negative electrode potential of the battery cell to be tested every preset cycle number in the fast charging cycle process until the negative electrode potential is less than zero; the life determining module 330 is configured to determine the life of the battery cell to be tested according to the minimum value of the negative electrode potential every preset cycle and the cycle of the battery cell to be tested performing the fast charging cycle.
On the basis of the above embodiment, the lifetime determination module 330 includes: a relationship determination unit and a lifetime determination unit; the relation determining unit is used for determining the corresponding relation between the cycle times and the minimum value of the negative electrode potential according to the minimum value of the negative electrode potential of the to-be-tested battery cell every preset cycle time and the cycle times of the to-be-tested battery cell for performing quick charge cycle; and the service life determining unit is used for fitting the minimum value of the negative electrode potential and the cycle number of every preset cycle number according to the corresponding relation, and determining the service life of the battery cell to be tested.
Preferably, the lifetime determination unit comprises a curve fitting subunit and a lifetime determination subunit; the curve fitting subunit is used for fitting the minimum value of the negative electrode potential every preset cycle and the cycle to obtain a fitting curve; and the life determining subunit is used for determining the cycle number when the negative electrode potential in the fitting curve is zero according to the fitting curve, and taking the cycle number at the moment as the life of the battery cell to be tested.
In one embodiment, the device further comprises a negative electrode potential determining module and a reserved potential determining module; the negative electrode potential determining module is used for determining the negative electrode potential when the cycle number corresponding to the preset target life is zero according to the fitting curve and the preset target life; and the reserved potential determining module is used for taking the negative electrode potential when the cycle number corresponding to the preset target life is zero as the preset reserved potential.
Optionally, the apparatus further includes a potential obtaining module and a first potential determining module; the potential acquisition module is used for performing quick charge on the electric core to be tested according to a preset quick charge strategy to acquire the minimum value of the negative electrode potential of the electric core to be tested; the first potential determination module is used for taking the minimum value of the negative electrode potential of the test battery cell as a preset reserved potential.
Optionally, the apparatus further includes a life comparison module and a second potential determination module; the service life comparison module is used for comparing the preset target service life with the service life of the battery cell to be tested according to the preset target service life; the second potential determining module is used for determining a preset reserved potential according to the preset target life if the preset target life is longer than the life of the battery cell to be tested.
The device for determining the service life of the battery cell provided in this embodiment and the method for determining the service life of the battery cell provided in any embodiment of the present invention belong to the same inventive concept, and have corresponding beneficial effects, and detailed technical details in this embodiment are not described in the method for determining the service life of the battery cell provided in any embodiment of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. 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 modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method for determining a cell life, comprising:
acquiring the minimum value of the negative electrode potential of the battery cell to be tested in the quick charging process;
when the minimum value of the negative electrode potential is larger than or equal to a value corresponding to a preset reserved potential, performing quick charge circulation on the battery cell to be tested, and acquiring the minimum value of the negative electrode potential of the battery cell to be tested every preset cycle number in the quick charge circulation process until the negative electrode potential is smaller than zero;
and determining the service life of the battery cell to be tested according to the minimum value of the negative electrode potential every preset cycle number and the cycle number of the quick charge cycle of the battery cell to be tested.
2. The method for determining the service life of the battery cell according to claim 1, wherein the determining the service life of the battery cell to be tested according to the minimum value of the negative electrode potential every preset cycle number and the cycle number of the battery cell to be tested performing the fast charging cycle comprises:
determining a corresponding relation between the cycle times and the minimum value of the negative electrode potential according to the minimum value of the negative electrode potential of the to-be-tested battery cell every preset cycle time and the cycle times of the to-be-tested battery cell for performing quick charge cycle;
and fitting the minimum value of the negative electrode potential every preset cycle number and the cycle number according to the corresponding relation, and determining the service life of the to-be-tested battery cell.
3. The method for determining the service life of the battery cell according to claim 2, wherein the fitting the minimum value of the negative electrode potential every preset cycle number and the cycle number to determine the service life of the battery cell to be tested comprises:
fitting the minimum value of the negative electrode potential every preset cycle number and the cycle number to obtain a fitting curve;
and determining the cycle number when the negative electrode potential is zero in the fitting curve according to the fitting curve, and taking the cycle number at the moment as the service life of the battery cell to be tested.
4. The method for determining the life of the battery cell of claim 3, wherein after determining the life of the battery cell to be tested, the method comprises:
determining the negative electrode potential when the cycle number corresponding to the preset target life is zero according to the fitting curve and the preset target life;
and taking the negative electrode potential when the cycle number corresponding to the preset target life is zero as the preset reserved potential.
5. The method for determining the battery cell life according to claim 1, wherein the obtaining the minimum value of the negative electrode potential of the battery cell to be tested in the fast charging process before the minimum value of the negative electrode potential comprises:
performing fast charging on the electric core to be tested according to a preset fast charging strategy to obtain the minimum value of the negative electrode potential of the electric core to be tested;
and taking the minimum value of the negative electrode potential of the test battery cell as the preset reserved potential.
6. The method for determining the life of the battery cell of claim 1, wherein after determining the life of the battery cell to be tested, the method comprises:
comparing the preset target life with the life of the battery cell to be tested according to the preset target life;
and if the preset target service life is longer than the service life of the battery cell to be tested, determining the preset reserved potential according to the preset target service life.
7. The method for determining the service life of the battery cell of claim 1, wherein the magnitude of the preset reserved potential is positively correlated with the service life of the battery cell to be tested.
8. The method for determining the service life of the battery cell of claim 1, wherein the preset reserved potential is greater than zero.
9. An apparatus for determining cell life, comprising:
the potential acquisition module is used for acquiring the minimum value of the negative electrode potential of the battery cell to be tested in the quick charging process;
the battery cell quick-charging module is used for performing quick-charging circulation on the battery cell to be tested when the minimum value of the negative electrode potential is greater than or equal to a value corresponding to a preset reserved potential, and acquiring the minimum value of the negative electrode potential of the battery cell to be tested every preset cycle number in the quick-charging circulation process until the negative electrode potential is less than zero;
and the service life determining module is used for determining the service life of the to-be-tested battery cell according to the minimum value of the negative electrode potential of every preset cycle and the cycle times of the to-be-tested battery cell for quick charge cycle.
10. The apparatus of claim 9, wherein the lifetime determination module comprises:
the relation determining unit is used for determining the corresponding relation between the cycle times and the minimum value of the negative electrode potential according to the minimum value of the negative electrode potential of the to-be-tested battery cell every preset cycle times and the cycle times of the to-be-tested battery cell for performing quick charge cycle;
and the service life determining unit is used for fitting the minimum value of the negative electrode potential of every preset cycle number and the cycle number according to the corresponding relation, and determining the service life of the battery cell to be tested.
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