CN114062932B - Battery lithium precipitation detection method - Google Patents
Battery lithium precipitation detection method Download PDFInfo
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- CN114062932B CN114062932B CN202111446673.6A CN202111446673A CN114062932B CN 114062932 B CN114062932 B CN 114062932B CN 202111446673 A CN202111446673 A CN 202111446673A CN 114062932 B CN114062932 B CN 114062932B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 87
- 238000001556 precipitation Methods 0.000 title claims abstract description 73
- 238000001514 detection method Methods 0.000 title abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 53
- 230000015556 catabolic process Effects 0.000 claims description 7
- 238000006731 degradation reaction Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims 2
- 229910001416 lithium ion Inorganic materials 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 16
- 238000005259 measurement Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000007 visual effect 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]
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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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- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The embodiment of the invention discloses a method for detecting lithium precipitation of a battery. The method comprises the following steps: detecting and recording data of voltage change of the battery to be detected in a first standing time after charging to form a first data curve; detecting and recording data of voltage change in a second standing time after the battery to be detected is charged after the battery to be detected is used for a first period of time, and forming a second data curve; detecting and recording data of voltage change in a third standing time after the battery to be detected is charged after the second period of time is used, and forming a third data curve; judging whether lithium precipitation occurs in the battery to be tested or not and whether lithium precipitation worsens or not according to the first data curve, the second data curve and the third data curve. Compared with the existing detection method for lithium precipitation of the battery, the method can detect and monitor whether lithium precipitation occurs and whether lithium precipitation worsens in the use process of the battery in the full life cycle in real time on the premise of not damaging the battery.
Description
Technical Field
The embodiment of the invention relates to the technical field of battery detection, in particular to a method for detecting lithium precipitation of a battery.
Background
At present, two main detection methods for lithium precipitation of an electric core exist, namely, a first method is as follows: a three electrode method; the second method is as follows: and (5) cell disassembly. However, both methods have respective disadvantages, wherein the three-electrode method is used for judging whether the battery core is out of lithium by monitoring the potential of the negative electrode of the battery core, and the three-electrode method needs to damage the body structure of the battery core in the practical application process, so that the three-electrode method can only be used for researching and analyzing the battery core and cannot be widely used for practical application. The battery cell disassembly method is a most visual lithium separation judgment method for judging whether the battery cell separates lithium according to the specific state of the battery cell after the battery cell is fully charged, but for the case of micro lithium separation, the battery cell disassembly method cannot accurately judge whether the battery cell separates lithium, because when the lithium separation amount of the battery cell is very small, the lithium separated from the battery cell cathode can be dissolved into the battery cell cathode, so that the battery cell can not accurately judge whether the battery cell separates lithium when the battery cell is disassembled. In addition, the battery cell lithium-precipitation detection method cannot detect the lithium-precipitation state of the battery cell in real time in the use process of the battery cell.
Disclosure of Invention
The embodiment of the invention provides a method for detecting lithium precipitation of a battery, which is used for detecting whether the lithium precipitation of the battery occurs and whether the lithium precipitation is deteriorated in real time on the premise of not damaging the battery.
The embodiment of the invention provides a method for detecting lithium precipitation of a battery, which comprises the following steps:
detecting and recording data of voltage change of the battery to be detected in a first standing time after charging to form a first data curve;
detecting and recording data of voltage change in a second standing time after the battery to be detected is charged after the battery to be detected is used for a first period of time, and forming a second data curve;
detecting and recording data of voltage change in a third standing time after the battery to be detected is charged after the second period of time is used, and forming a third data curve;
judging whether lithium precipitation occurs in the battery to be tested or not and whether lithium precipitation worsens or not according to the first data curve, the second data curve and the third data curve.
Optionally, before detecting and recording the data of the voltage change of the battery to be tested in the first standing time after charging and forming the first data curve, the method further includes:
and discharging the battery to be tested at the first charge-discharge multiplying power until the battery to be tested reaches the first charge state.
Optionally, the first charge-discharge rate range is 0.05C-2C;
the first state of charge is 0% -80% state of charge.
Optionally, before detecting and recording the data of the voltage change of the battery to be tested in the first standing time after charging and forming the first data curve, the method further includes:
charging the battery to be tested with a second charge-discharge multiplying power until the battery to be tested reaches a second charge state;
after detecting and recording the data of the voltage change in the second standing time after the battery to be detected is charged for a first period of time, and before forming a second data curve, the method further comprises the steps of:
charging the battery to be tested which is used for a first period of time with a second charge-discharge multiplying power until the battery to be tested reaches a second charge state;
after detecting and recording the second period of time, the method further comprises the steps of:
and charging the battery to be tested which is used for a second period of time with a second charge-discharge multiplying power until the battery to be tested reaches a second charge state.
Optionally, the second charge-discharge rate range is 0.2C-5C;
the first state of charge is less than the second state of charge.
Optionally, judging whether the lithium precipitation occurs in the battery to be tested and whether the lithium precipitation worsens according to the first data curve, the second data curve and the third data curve, including:
respectively carrying out data processing on the first data curve, the second data curve and the third data curve to obtain a first change curve, a second change curve and a third change curve;
judging whether the battery to be tested is subjected to lithium precipitation or not and whether the battery to be tested is subjected to lithium precipitation or not is deteriorated according to the first change curve, the second change curve and the third change curve.
Optionally, performing data processing on the first data curve, the second data curve and the third data curve to obtain a first change curve, a second change curve and a third change curve, which include:
deriving a first data curve to obtain a first change curve;
deriving a second data curve to obtain a second change curve;
and deriving the third data curve to obtain a third change curve.
Optionally, the first rest time, the second rest time and the third rest time are all equal;
judging whether the lithium precipitation occurs in the battery to be tested and whether the lithium precipitation worsens or not according to the first change curve, the second change curve and the third change curve, comprising:
acquiring a first difference value of the second change curve and the first change curve;
if the first difference value is larger than a first threshold value, judging that lithium precipitation occurs in the battery to be tested in a first period of time;
acquiring a second difference value of the third change curve and the second change curve;
obtaining a third difference value between the second difference value and the first difference value;
and if the third difference value is larger than the second threshold value, judging that the lithium precipitation of the battery to be tested is deteriorated in the second period of time.
Optionally, detecting and recording data of voltage change of the battery to be measured in a first standing time after charging to form a first data curve, including:
the time interval for detecting and recording the voltage change of the battery to be detected at each time is less than 10S;
detecting and recording data of voltage change in a second standing time after the battery to be detected is charged after the battery to be detected is used for a first period of time, forming a second data curve, and comprising the following steps:
the time interval for detecting and recording the voltage change of the battery to be detected at each time is less than 10S;
detecting and recording data of voltage change in a third standing time after the battery to be detected is charged after the second period of time is used, and forming a third data curve, wherein the method comprises the following steps of:
the time interval for detecting and recording the voltage change of the battery to be detected each time is less than 10S.
Optionally, the second period of time is greater than the first period of time.
According to the embodiment of the invention, the first data curve is formed by detecting and recording the data of the voltage change of the battery to be detected in the first standing time after charging; detecting and recording data of voltage change in a second standing time after the battery to be detected is charged after the battery to be detected is used for a first period of time, and forming a second data curve; detecting and recording data of voltage change in a third standing time after the battery to be detected is charged after the second period of time is used, and forming a third data curve; and comparing whether the variation trend of the first data curve, the second data curve and the third data curve is consistent, so as to judge whether the lithium precipitation occurs and whether the lithium precipitation worsens in the battery to be tested. Compared with the existing detection method for lithium precipitation of the battery, the method can detect and monitor whether lithium precipitation occurs and whether lithium precipitation worsens in the use process of the whole life cycle of the battery in real time on the premise of not damaging the battery, so that the lithium precipitation state of the battery is reflected in time, and early warning is made on the conditions of lithium precipitation and lithium precipitation worsening of the battery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, a brief description will be given below of the drawings required for the embodiments or the description of the prior art, and it is obvious that although the drawings in the following description are specific embodiments of the present invention, it is obvious to those skilled in the art that the basic concepts of the device structure, the driving method and the manufacturing method, which are disclosed and suggested according to the various embodiments of the present invention, are extended and extended to other structures and drawings, and it is needless to say that these should be within the scope of the claims of the present invention.
Fig. 1 is a schematic flow chart of a method for detecting lithium precipitation of a battery according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a first data curve according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a second data curve according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a third data curve according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of another method for detecting lithium precipitation of a battery according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a first variation curve derived from the first data curve of FIG. 2;
FIG. 7 is a schematic diagram of a second variation curve derived from the second data curve of FIG. 3;
FIG. 8 is a schematic diagram of a third variation curve derived from the third data curve of FIG. 4;
FIG. 9 is a schematic diagram of the difference curves of FIGS. 7 and 6, and the difference curves of FIGS. 8 and 7;
fig. 10 is a schematic diagram of a difference curve of the second difference and the third difference in fig. 9.
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 be within the scope of the invention.
Fig. 1 is a flow chart of a method for detecting lithium precipitation of a battery according to an embodiment of the present invention, where the embodiment is applicable to real-time detection of a lithium precipitation state of a battery during use, and the method specifically includes the following steps:
s110, detecting and recording data of voltage change of the battery to be detected in a first standing time after charging, and forming a first data curve.
The battery to be tested is a storage battery capable of being charged and discharged. The first rest time is a recording time for detecting the change of the voltage of the battery to be tested from the polar state to the steady state after charging, and for example, the first rest time can be 1min-120min. The method comprises the steps of detecting and recording data of voltage change of a battery to be detected in a first standing time after charging, and substantially detecting and recording a change trend of the voltage of the battery to be detected along with time in the process that the voltage of the battery to be detected is recovered from an polar state to a steady state after charging, namely a first data curve formed by voltage data of the voltage of the battery to be detected along with time.
Fig. 2 is a schematic diagram of a first data curve provided by the embodiment of the invention, as shown in fig. 2, in which a battery to be tested is charged to a state of charge of 80% at a current of 0.2C-0.5C and then is left for 1min-120min to obtain the first data curve. The abscissa of the first data curve is time and the ordinate is voltage. As can be seen from the figure, the battery voltage of the battery to be measured gradually returns from the polar voltage a to the steady voltage B within the first rest time (800S-2000S) after charging.
And S120, detecting and recording data of voltage change in a second standing time after the battery to be detected is charged after the battery to be detected is used for a first period of time, and forming a second data curve.
The first period of time refers to the time that the battery to be tested is used, and the measurement unit of the first period of time takes days as the measurement unit, for example, the first period of time may refer to 3 days to 180 days. The second standing time is a recording time for detecting that the voltage of the battery to be tested changes from the polar state to the steady state after the battery to be tested is used for a first period of time, for example, the first standing time can be 1min-120min. The data of the voltage change of the battery to be measured in the second standing time after charging is detected and recorded, and the data is actually detected and recorded, namely a second data curve formed by the voltage data of the voltage change of the battery to be measured along with time in the process that the voltage of the battery to be measured is recovered from an polar state to a steady state after charging.
Fig. 3 is a schematic diagram of a second data curve provided in an embodiment of the present invention, as shown in fig. 3, in which the battery to be tested is a second data curve obtained by charging at a current of 0.2C-0.5C to a state of charge of 80% after 15 days of use and then standing for 1min-120min. The abscissa of the second data curve is time, the ordinate is voltage, and the battery voltage of the battery to be tested after the battery to be tested is charged after the first period of time is gradually recovered from the polar voltage A1 to the steady-state voltage B1 within the second standing time (800S-2000S).
And S130, detecting and recording data of voltage change in a third standing time after the battery to be detected is charged after the second period of time is used, and forming a third data curve.
The second period of time refers to the time that the battery to be tested is used, and the measurement unit of the second period of time takes days as the measurement unit, for example, the second period of time can refer to 3 days to 180 days. (note that the second period of time should be longer than the first period of time.) the third rest time is a recording time for detecting the change of the voltage from the polar state to the steady state after the use of the battery to be measured for the second period of time, and for example, the third rest time may be 1min to 120min. The data of the voltage change of the battery to be measured in the third standing time after charging is detected and recorded, and the third data curve formed by the voltage data of the voltage change of the battery to be measured along with time in the process that the voltage of the battery to be measured is recovered from the polar state to the steady state after charging is substantially detected and recorded.
Fig. 4 is a schematic diagram of a third data curve provided in an embodiment of the present invention, as shown in fig. 4, in which the battery to be tested is a third data curve obtained by charging at a current of 0.2C-0.5C to a state of charge of 80% after 15 days of re-use and then standing for 1min-120min. The abscissa of the third data curve is time, the ordinate is voltage, and the battery voltage of the battery to be tested after being charged in the second period of time gradually recovers from the polar voltage A2 to the steady-state voltage B2 in the third standing time (800S-2000S).
And S140, judging whether the lithium precipitation occurs in the battery to be tested or not and whether the lithium precipitation worsens or not according to the first data curve, the second data curve and the third data curve.
The change trend of the voltage of the battery to be measured, which is not subjected to lithium precipitation, from the polar state to the steady state after charging is kept consistent, so that whether lithium precipitation occurs and whether lithium precipitation degradation occurs in the battery to be measured can be determined by comparing the change curves of the voltage of the battery to be measured, which is detected in the standing time, with time, namely, comparing whether the change trends of the first data curve, the second data curve and the third data curve are consistent or not.
According to the embodiment of the invention, the first data curve is formed by detecting and recording the data of the voltage change of the battery to be detected in the first standing time after charging; detecting and recording data of voltage change in a second standing time after the battery to be detected is charged after the battery to be detected is used for a first period of time, and forming a second data curve; detecting and recording data of voltage change in a third standing time after the battery to be detected is charged after the second period of time is used, and forming a third data curve; and comparing whether the variation trend of the first data curve, the second data curve and the third data curve is consistent, so as to judge whether the lithium precipitation occurs and whether the lithium precipitation worsens in the battery to be tested. Compared with the existing detection method for lithium precipitation of the battery, the method can detect and monitor whether lithium precipitation occurs and whether lithium precipitation worsens in the use process of the whole life cycle of the battery in real time on the premise of not damaging the battery, so that the lithium precipitation state of the battery is reflected in time, and early warning is made on the conditions of lithium precipitation and lithium precipitation worsening of the battery.
Fig. 5 is a flow chart of another method for detecting lithium precipitation of a battery according to an embodiment of the present invention, which specifically includes the following steps:
and S210, discharging the battery to be tested at a first charge-discharge multiplying power until the battery to be tested reaches a first charge state.
The battery to be tested needs to be discharged before being charged, and the battery to be tested is discharged at a fixed first charge-discharge multiplying power, so that the discharge time of the battery to be tested can be accurately obtained according to the first charge-discharge multiplying power, a first charge state reached by the discharge of the battery to be tested, a discharge current and other parameters, and whether the battery to be tested reaches the first charge state can be determined through time.
Optionally, the first charge-discharge rate range is 0.05C-2C; the first state of charge is 0% -80% state of charge.
The first charge-discharge multiplying power is set to be 0.05C-2C, and the discharge time of the battery to be measured can be adjusted by adjusting the discharge current of the battery to be measured. The first state of charge is 0% -80% of the state of charge, so that the first state of charge is not too large, and the battery to be measured can be charged continuously.
And S220, charging the battery to be tested with a second charge-discharge multiplying power until the battery to be tested reaches a second charge state.
And S230, detecting and recording data of voltage change of the battery to be detected in a first standing time after charging to form a first data curve.
And S240, charging the battery to be tested which is used for a first period of time with a second charge-discharge multiplying power until the battery to be tested reaches a second charge state.
And S250, detecting and recording data of voltage change in a second standing time after the battery to be detected is charged after the battery to be detected is used for a first period of time, and forming a second data curve.
And S260, charging the battery to be tested which is used for a second period of time with a second charge-discharge multiplying power until the battery to be tested reaches a second charge state.
And S270, detecting and recording the data of the voltage change in a third standing time after the battery to be detected is charged after the second period of time is used, and forming a third data curve.
The battery to be measured is charged at a fixed second charge-discharge multiplying power, and the charging time of the battery to be measured can be accurately obtained according to the second charge-discharge multiplying power, the second charge state required to be achieved by the discharging of the battery to be measured, the discharging current and other parameters, so that whether the battery to be measured achieves the second charge state can be determined through time. It should be noted that: the second state of charge of the battery under test is greater than the first state of charge of the battery under test.
Optionally, the second charge-discharge multiplying power range is 0.2-5C; the first state of charge is less than the second state of charge.
The setting range of the second charge-discharge multiplying power is 0.2C-5C, and the charging time of the battery to be tested can be adjusted by adjusting the charging current of the battery to be tested. Since the battery to be measured is charged to the second charge state under the first charge state, the first charge state of the battery to be measured is smaller than the second charge state of the battery to be measured.
And S280, respectively carrying out data processing on the first data curve, the second data curve and the third data curve to obtain a first change curve, a second change curve and a third change curve.
And respectively carrying out data processing on the first data curve, the second data curve and the third data curve, so that the change trend of each data curve is more intuitively reflected.
Specifically, data processing is performed on the first data curve, the second data curve and the third data curve respectively to obtain a first change curve, a second change curve and a third change curve, which comprises the following steps: deriving a first data curve to obtain a first change curve; deriving a second data curve to obtain a second change curve; and deriving the third data curve to obtain a third change curve.
The first change curve obtained by deriving the first data curve is a change rate curve of data of voltage change relative to time in the first standing time. Fig. 6 is a schematic diagram of a first variation curve derived from the first data curve of fig. 2, and as shown in fig. 6, the abscissa represents time, and the ordinate represents a rate of change of the battery voltage to be measured with respect to time.
The second change curve obtained by deriving the second data curve is a change rate curve of data of voltage change in the second standing time relative to time. Fig. 7 is a schematic diagram of a second variation curve derived from the second data curve of fig. 3, where, as shown in fig. 7, the abscissa is time and the ordinate is the rate of change of the battery voltage to be measured with respect to time.
The third change curve obtained by deriving the third data curve is a change rate curve of the data of the voltage change in the third standing time with respect to time. Fig. 8 is a schematic diagram of a third variation curve derived from the third data curve of fig. 4, where, as shown in fig. 8, the abscissa is time and the ordinate is the rate of change of the battery voltage to be measured with respect to time.
And S290, judging whether the battery to be tested generates lithium precipitation or not and judging whether the lithium precipitation is deteriorated or not according to the first change curve, the second change curve and the third change curve.
The change of the degree of the voltage change trend along with the time is intuitively obtained through the first change curve, the second change curve and the third change curve, and whether the degree of the change trend of the first change curve, the second change curve and the third change curve is consistent can be intuitively judged, so that whether lithium is separated from the battery to be tested and whether lithium separation degradation occurs or not can be determined.
Specifically, the first rest time, the second rest time and the third rest time are all equal; judging whether the lithium precipitation occurs in the battery to be tested and whether the lithium precipitation worsens or not according to the first change curve, the second change curve and the third change curve, comprising:
a first difference between the second variation curve and the first variation curve is obtained.
If the first difference value is larger than a first threshold value, judging that lithium precipitation occurs in the battery to be tested in a first period of time;
acquiring a second difference value of the third change curve and the second change curve;
obtaining a third difference value between the second difference value and the first difference value;
and if the third difference value is larger than the second threshold value, judging that the lithium precipitation of the battery to be tested is deteriorated in the second period of time.
Fig. 9 is a schematic diagram of the difference curves of fig. 7 and 6 and the difference curves of fig. 8 and 7, and as shown in fig. 9, the abscissa is time, and the ordinate is the change rate difference of the battery voltage to be measured with respect to time. The solid line is the first difference curve of the difference curves of fig. 7 and 6, and the dotted line is the second difference curve of the difference curves of fig. 8 and 7.
If the difference value corresponding to the first difference curve in fig. 9 is greater than the first threshold value, determining that lithium precipitation occurs in the battery to be tested within a first period of time; if the difference corresponding to the first difference curve in fig. 9 is less than or equal to the first threshold, it is determined that lithium precipitation does not occur in the battery to be measured within a first period of time. It should be noted that the first threshold is related to the second charging rate of the battery to be tested and the time interval of voltage data acquisition, and thus the first threshold needs to be set according to the detected specific practical situation. Assuming that the first threshold is 0.0006, according to the first difference curves in fig. 9, the differences of the first difference curves are smaller than 0.006, which indicates that the lithium is not separated from the battery to be tested in the first period of time.
Fig. 10 is a schematic diagram of a difference curve of the second difference and the third difference in fig. 9, where, as shown in fig. 10, the abscissa is time, and the ordinate is a change rate difference of the voltage of the battery to be measured with respect to time. The difference curve of the second difference and the third difference is the third difference curve.
If the difference corresponding to the third difference curve in fig. 10 is greater than the second threshold, determining that lithium precipitation degradation occurs in the battery to be tested in the second period of time; if the difference value corresponding to the third difference curve in fig. 10 is smaller than or equal to the second threshold value, it is determined that lithium precipitation degradation does not occur in the battery to be tested in the second period of time. It should be noted that the second threshold is related to the second charging rate of the battery to be tested and the time interval of voltage data acquisition, so that the second threshold needs to be set according to the detected specific practical situation. Assuming that the second threshold is 0.0002, as can be seen from the third difference curve in fig. 10, the difference portion of the third difference curve is greater than 0.002, which indicates that the lithium precipitation degradation occurs in the battery under test during the second period of time. Optionally, detecting and recording data of voltage change of the battery to be measured in a first standing time after charging to form a first data curve, including: the time interval for detecting and recording the voltage change of the battery to be detected at each time is less than 10S;
detecting and recording data of voltage change in a second standing time after the battery to be detected is charged after the battery to be detected is used for a first period of time, forming a second data curve, and comprising the following steps: the time interval for detecting and recording the voltage change of the battery to be detected at each time is less than 10S;
detecting and recording data of voltage change in a third standing time after the battery to be detected is charged after the second period of time is used, and forming a third data curve, wherein the method comprises the following steps of: the time interval for detecting and recording the voltage change of the battery to be detected each time is less than 10S.
The time interval for detecting and recording the voltage change of the battery to be detected each time is set to be smaller than 10S, and the accuracy of the first data curve, the second data curve and the third data curve formed by the data of the voltage change of the battery to be detected can be higher by increasing the number of times of data acquisition, so that whether lithium precipitation occurs and whether lithium precipitation deterioration occurs in the battery to be detected can be judged more accurately according to the first data curve, the second data curve and the third data curve.
Optionally, the second period of time is greater than the first period of time.
The second period of time is longer than the first period of time, so that the voltage change data of the battery to be measured after different periods of time are ensured, and whether lithium precipitation degradation of the battery to be measured occurs can be accurately judged according to the second data curve and the third data curve obtained by measuring the battery to be measured after different periods of time.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A method for detecting lithium precipitation of a battery, comprising:
detecting and recording data of voltage change of the battery to be detected in a first standing time after charging to form a first data curve;
detecting and recording data of voltage change in a second standing time after the battery to be detected is charged after the battery to be detected is used for a first period of time, and forming a second data curve;
detecting and recording data of voltage change in a third standing time after the battery to be detected is charged after the second period of time is used, and forming a third data curve;
judging whether lithium precipitation occurs to the battery to be tested and whether lithium precipitation degradation occurs to the battery to be tested according to the first data curve, the second data curve and the third data curve, wherein the method comprises the following steps of:
respectively carrying out data processing on the first data curve, the second data curve and the third data curve to obtain a first change curve, a second change curve and a third change curve;
judging whether the lithium of the battery to be tested is separated or not and whether the lithium separation is deteriorated or not according to the first change curve, the second change curve and the third change curve;
the first rest time, the second rest time and the third rest time are all equal;
judging whether the lithium is separated from the battery to be tested and whether lithium separation is deteriorated according to the first change curve, the second change curve and the third change curve, wherein the method comprises the following steps:
acquiring a first difference value of the second change curve and the first change curve;
if the first difference value is larger than a first threshold value, judging that lithium is separated from the battery to be tested in the first period of time;
acquiring a second difference value of the third change curve and the second change curve;
acquiring a third difference value between the second difference value and the first difference value;
and if the third difference value is larger than a second threshold value, judging that the lithium precipitation of the battery to be tested is deteriorated in the second period of time.
2. The method for detecting lithium precipitation of a battery according to claim 1, wherein before detecting and recording data of voltage change of the battery to be detected in a first rest time after charging, forming a first data curve, further comprising:
and discharging the battery to be tested at a first charge-discharge multiplying power until the battery to be tested reaches a first charge state.
3. The method for detecting lithium ion battery according to claim 2, wherein the first charge-discharge rate range is 0.05C-2C;
the first state of charge is a state of charge of 0% -80%.
4. The method for detecting lithium precipitation of a battery according to claim 2, wherein before detecting and recording data of voltage change of the battery to be detected in a first rest time after charging, forming a first data curve, further comprising:
charging the battery to be tested with a second charge-discharge multiplying power until the battery to be tested reaches a second charge state;
after detecting and recording the data of the voltage change in the second standing time after the battery to be tested is charged for a first period of time, before forming a second data curve, the method further comprises:
charging the battery to be tested after being used for a first period of time with a second charge-discharge multiplying power until the battery to be tested reaches a second charge state;
after detecting and recording the second period of time, the data of the voltage change in the third standing time after the battery to be tested is charged, and before forming the third data curve, the method further comprises:
and charging the battery to be tested which is used for a second period of time with a second charge-discharge multiplying power until the battery to be tested reaches a second charge state.
5. The method according to claim 4, wherein the second charge-discharge rate range is 0.2C to 5C;
the first state of charge is less than the second state of charge.
6. The method for detecting lithium ion battery according to claim 1, wherein the data processing is performed on the first data curve, the second data curve, and the third data curve, respectively, to obtain a first change curve, a second change curve, and a third change curve, and the method comprises:
deriving the first data curve to obtain a first change curve;
deriving the second data curve to obtain a second change curve;
and deriving the third data curve to obtain a third change curve.
7. The method for detecting lithium precipitation of a battery according to claim 1, wherein detecting and recording data of voltage change of the battery to be detected in a first rest time after charging to form a first data curve comprises:
the time interval for detecting and recording the voltage change of the battery to be detected every time is smaller than 10S;
detecting and recording data of voltage change in a second standing time after the battery to be detected is charged after the battery to be detected is used for a first period of time, forming a second data curve, and comprising the following steps:
the time interval for detecting and recording the voltage change of the battery to be detected every time is smaller than 10S;
detecting and recording data of voltage change in a third standing time after the battery to be detected is charged after the second period of time is used, and forming a third data curve, wherein the method comprises the following steps of:
and the time interval for detecting and recording the voltage change of the battery to be detected each time is smaller than 10S.
8. The method of claim 1, wherein the second period of time is greater than the first period of time.
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