CN113125974A - Method and device for detecting lithium separation of battery - Google Patents
Method and device for detecting lithium separation of battery Download PDFInfo
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- CN113125974A CN113125974A CN202110438295.0A CN202110438295A CN113125974A CN 113125974 A CN113125974 A CN 113125974A CN 202110438295 A CN202110438295 A CN 202110438295A CN 113125974 A CN113125974 A CN 113125974A
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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
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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]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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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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Abstract
The embodiment of the invention discloses a method and a device for detecting lithium separation of a battery, which comprises the following steps: charging the three-electrode battery by adopting a preset first current to obtain a first charge state when the negative electrode potential of the three-electrode battery is the negative cut-off potential; charging the three-electrode battery by adopting a preset second current to obtain a second charge state when the negative electrode potential of the three-electrode battery is the negative cut-off potential; determining a first negative electrode potential and a second negative electrode potential respectively corresponding to the first charge state and the second charge state based on the corresponding relation between the charge states and the negative electrode potentials; and determining the relation between the negative electrode potential and the current according to the preset first current, the preset second current, the first negative electrode potential and the second negative electrode potential, and determining lithium precipitation windows corresponding to different currents based on the relation between the negative electrode potential and the current and the corresponding relation between the charge state and the negative electrode potential. The method and the device for detecting the lithium separation of the battery provided by the embodiment of the invention can improve the efficiency and convenience of the lithium separation detection of the battery.
Description
Technical Field
The embodiment of the invention relates to a battery detection technology, in particular to a battery lithium separation detection method and device.
Background
In recent years, with the rapid development of electric vehicles, mileage anxiety becomes a key factor limiting the large-scale popularization of electric vehicles, and two directions for solving the endurance of electric vehicles are mainly to increase the energy density of batteries and shorten the charging time of the batteries. The key risk point of shortening the battery charging time, namely, the rapid charging, is that lithium is separated from the negative electrode, and the state of charge which can be reached by the battery under different current charging conditions needs to be obtained.
At present, the existing lithium analysis detection method for the battery generally tests lithium analysis windows under different currents, and when the lithium analysis windows under different currents are tested, the charging states of the batteries corresponding to the currents need to be tested one by one, so that the workload is large, and the detection efficiency and convenience are influenced.
Disclosure of Invention
The embodiment of the invention provides a method and a device for detecting battery lithium separation, which are used for improving the efficiency and convenience of the battery lithium separation detection.
In a first aspect, an embodiment of the present invention provides a method for detecting lithium deposition in a battery, including:
acquiring the corresponding relation between the charge state and the negative electrode potential of the three-electrode battery in the charging process;
charging the three-electrode battery by adopting a preset first current to obtain a first charge state when the negative electrode potential of the three-electrode battery is the negative cut-off potential;
charging the three-electrode battery by adopting a preset second current to obtain a second charge state when the negative electrode potential of the three-electrode battery is the negative cut-off potential;
determining a first negative electrode potential and a second negative electrode potential respectively corresponding to the first charge state and the second charge state based on the corresponding relation between the charge states and the negative electrode potentials; wherein the negative electrode potential is positively correlated with the logarithm of the current;
and determining the relation between the negative electrode potential and the current according to the preset first current, the preset second current, the first negative electrode potential and the second negative electrode potential, and determining lithium precipitation windows corresponding to different currents based on the relation between the negative electrode potential and the current and the corresponding relation between the charge state and the negative electrode potential.
Optionally, determining a first negative electrode potential and a second negative electrode potential corresponding to the first state of charge and the second state of charge respectively based on the corresponding relationship between the state of charge and the negative electrode potential includes:
drawing a relation curve of the charge state and the negative electrode potential based on the obtained corresponding relation of the charge state and the negative electrode potential;
and determining a first negative electrode potential and a second negative electrode potential respectively corresponding to the first charge state and the second charge state according to a relation curve of the charge states and the negative electrode potentials.
Optionally, determining a relationship between the negative electrode potential and the current according to a preset first current, a preset second current, the first negative electrode potential and the second negative electrode potential includes:
will preset a first current I1And a first negative electrode potential OCVMinus 1Substituted OCVNegative poleA + blgI, and a second current I is preset2And a second negative electrode potential OCVMinus 2Substituted OCVNegative poleA + blgI, yielding values for a and b;
determining the relation between the potential of the negative electrode and the current according to the values of a and b; wherein, the negative electrode potential OCV of the three-electrode batteryNegative poleI is the current, and a and b are both coefficients.
Optionally, determining lithium separation windows corresponding to different currents based on a relationship between a negative electrode potential and a current and a corresponding relationship between a state of charge and the negative electrode potential, including:
determining a corresponding relation between the current and the charge state based on the relation between the negative electrode potential and the current and the corresponding relation between the charge state and the negative electrode potential;
and determining lithium analysis windows corresponding to different currents according to the corresponding relation between the current and the charge state.
Optionally, before obtaining the corresponding relationship between the state of charge and the negative electrode potential of the three-electrode battery in the charging process, the method includes:
and charging the three-electrode battery by using the preset multiplying power of the capacity of the three-electrode battery, and determining the corresponding relation between the charge state and the negative electrode potential of the three-electrode battery in the charging process.
Optionally, the three-electrode battery is charged at a rate of C1 of the capacity C of the three-electrode battery, and the value range of C1 is 0.01C-0.1C.
Optionally, the preset first current and the preset second current are respectively a minimum current and a maximum current corresponding to the target lithium analysis window.
Optionally, the negative cut-off potential of the three-electrode cellNegative pole＝ELi+/Li-ηLi+/Li,ELi+/LiIs 0V,. etaLi+/LiIs 0-200 mV.
In a second aspect, an embodiment of the present invention further provides a device for detecting lithium deposition in a battery, including:
the potential acquisition module is used for acquiring the corresponding relation between the charge state and the negative electrode potential of the three-electrode battery in the charging process;
the first charge state acquisition module is used for charging the three-electrode battery by adopting a preset first current and acquiring a first charge state when the negative electrode potential of the three-electrode battery is a negative electrode cut-off potential;
the second charge state acquisition module is used for charging the three-electrode battery by adopting a preset second current and acquiring a second charge state when the negative electrode potential of the three-electrode battery is a negative electrode cut-off potential;
the potential determining module is used for determining a first negative electrode potential and a second negative electrode potential respectively corresponding to the first charge state and the second charge state based on the corresponding relation between the charge states and the negative electrode potentials; wherein the negative electrode potential is positively correlated with the logarithm of the current;
and the window determining module is used for determining the relation between the negative electrode potential and the current according to the preset first current, the preset second current, the first negative electrode potential and the second negative electrode potential, and determining lithium analysis windows corresponding to different currents based on the relation between the negative electrode potential and the current and the corresponding relation between the charge state and the negative electrode potential.
Optionally, the potential determining module includes:
the curve drawing unit is used for drawing a relation curve of the charge state and the negative electrode potential based on the acquired corresponding relation of the charge state and the negative electrode potential;
and the potential determining unit is used for determining a first negative electrode potential and a second negative electrode potential corresponding to the first charge state and the second charge state respectively according to the relation curve of the charge states and the negative electrode potentials.
According to the method and the device for detecting the lithium separation of the battery, provided by the embodiment of the invention, the corresponding relation between the charge state and the negative electrode potential of the three-electrode battery in the charging process is obtained; charging the three-electrode battery by adopting a preset first current to obtain a first charge state when the negative electrode potential of the three-electrode battery is the negative cut-off potential; charging the three-electrode battery by adopting a preset second current to obtain a second charge state when the negative electrode potential of the three-electrode battery is the negative cut-off potential; determining a first negative electrode potential and a second negative electrode potential respectively corresponding to the first charge state and the second charge state based on the corresponding relation between the charge states and the negative electrode potentials; wherein the negative electrode potential is positively correlated with the logarithm of the current; and determining the relation between the negative electrode potential and the current according to the preset first current, the preset second current, the first negative electrode potential and the second negative electrode potential, and determining lithium precipitation windows corresponding to different currents based on the relation between the negative electrode potential and the current and the corresponding relation between the charge state and the negative electrode potential. Compared with the existing battery lithium analysis detection method, the battery lithium analysis detection method and the device provided by the embodiment of the invention can determine the lithium analysis windows corresponding to different currents based on the relationship between the negative electrode potential and the current and the corresponding relationship between the charge state and the negative electrode potential, and do not need to test the charge state of the battery corresponding to each current one by one, thereby improving the efficiency and convenience of battery lithium analysis detection.
Drawings
Fig. 1 is a flowchart of a method for detecting lithium deposition in a battery according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for detecting lithium deposition in a battery according to a second embodiment of the present invention;
fig. 3 is a schematic diagram illustrating changes in negative electrode potential and state of charge when a battery is charged with different currents according to a second embodiment of the present invention;
fig. 4 is a schematic diagram of a corresponding relationship between a state of charge and a negative electrode potential according to a second embodiment of the present invention;
FIG. 5 is a schematic diagram of a corresponding relationship between current and negative electrode potential according to a second embodiment of the present invention;
fig. 6 is a block diagram of a battery lithium analysis detection device 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 detecting lithium deposition from a battery according to an embodiment of the present invention, where the embodiment is applicable to aspects of lithium deposition detection for a battery, such as a three-electrode battery, and the method may be executed by a device for detecting lithium deposition from a battery, where the device may be implemented by software and/or hardware, and the device may be integrated in an electronic device with a function of detecting lithium deposition from a battery, such as a computer, and the method specifically includes the following steps:
and 110, acquiring the corresponding relation between the charge state and the negative electrode potential of the three-electrode battery in the charging process.
The three-electrode battery comprises a positive electrode, a negative electrode and a reference electrode, wherein the reference electrode is arranged between the positive electrode and the negative electrode. The three-electrode battery can be assembled in advance through an assembly process, and the specific assembly process refers to the existing assembly method of the three-electrode battery, which is not described herein again. The state of charge of the three-electrode battery reflects the residual capacity of the three-electrode battery, and the voltage and the capacity of the battery are in a nonlinear relation, so that the corresponding relation between the state of charge and the negative electrode potential of the three-electrode battery in the charging process is in the nonlinear relation, the three-electrode battery can be charged through a battery testing system, and if a charging power supply is arranged in the battery testing system, the charging power supply can be electrically connected with the positive electrode, the negative electrode and the reference electrode of the three-electrode battery to charge the three-electrode battery. The battery lithium precipitation detection device can acquire parameters such as the capacity, the positive and negative electrode potentials, the battery voltage and the like of the three-electrode battery in the charging process through an input port electrically connected with the three-electrode battery, the difference between the positive electrode potential and the negative electrode potential is the battery voltage, the acquired capacity is the residual capacity of the three-electrode battery, the ratio of the residual capacity to the total capacity is the value of the charge state, and therefore the charge state and the negative electrode potential of the three-electrode battery in the charging process can be acquired, namely the corresponding relation between the charge state and the negative electrode potential of the three-electrode battery in the charging process is acquired.
And 120, charging the three-electrode battery by adopting a preset first current, and acquiring a first charge state when the negative electrode potential of the three-electrode battery is the negative cut-off potential.
The preset first current may be a minimum current in a target lithium analysis window, a value range of a state of charge in the target lithium analysis window is a preset target range, and the minimum current in the target lithium analysis window is a current corresponding to the maximum value of the state of charge in the target lithium analysis window. The battery testing system can charge the three-electrode battery, in the charging process of the three-electrode battery by adopting the preset first current, the battery lithium analysis detection device can acquire parameters such as the capacity, the voltage and the like of the three-electrode battery in the charging process through an input port electrically connected with the three-electrode battery, when the acquired negative electrode potential is the negative electrode cut-off potential, the acquired capacity is the capacity when the negative electrode potential of the three-electrode battery is the negative electrode cut-off potential, and the ratio of the acquired capacity to the total capacity of the three-electrode battery is the value of the charge state, so that the first charge state when the negative electrode potential of the three-electrode battery is the negative electrode cut-off potential can be acquired.
And step 130, charging the three-electrode battery by adopting a preset second current, and obtaining a second charge state when the negative electrode potential of the three-electrode battery is the negative electrode cut-off potential.
The preset second current may be a maximum current in the target lithium analysis window, a value range of a state of charge in the target lithium analysis window is a preset target range, and the maximum current in the target lithium analysis window is a current corresponding to the minimum value of the state of charge in the target lithium analysis window. The battery lithium precipitation detection device can acquire parameters such as capacity, voltage and the like of the three-electrode battery in the charging process through an input port electrically connected with the three-electrode battery in the preset second current charging process of the three-electrode battery, when the acquired negative electrode potential is the negative electrode cut-off potential, the acquired capacity is the capacity when the negative electrode potential of the three-electrode battery is the negative electrode cut-off potential, and the ratio of the acquired capacity to the total capacity of the three-electrode battery is the value of the state of charge, so that the second state of charge when the negative electrode potential of the three-electrode battery is the negative electrode cut-off potential can be acquired.
It should be noted that the specific value of the negative cut-off potential can be set according to the specification and model of the three-electrode battery and the size of the performance parameter during actual detection, and is not limited herein.
And 140, determining a first negative electrode potential and a second negative electrode potential respectively corresponding to the first charge state and the second charge state based on the corresponding relation between the charge states and the negative electrode potentials.
According to the obtained corresponding relation between the charge state and the negative electrode potential, a corresponding relation curve between the charge state and the negative electrode potential can be determined, and if any charge state on the corresponding relation curve corresponds to the negative electrode potential, a first negative electrode potential and a second negative electrode potential corresponding to the first charge state and the second charge state respectively can be determined according to the corresponding relation curve.
And 150, determining the relation between the negative electrode potential and the current according to the preset first current, the preset second current, the first negative electrode potential and the second negative electrode potential, and determining lithium precipitation windows corresponding to different currents based on the relation between the negative electrode potential and the current and the corresponding relation between the charge state and the negative electrode potential.
Specifically, the relationship between the negative electrode potential and the current is a linear function of the negative electrode potential as a logarithm of the current, one corresponding point of the linear function in a planar rectangular coordinate system can be determined according to a preset logarithm of the first current and the first negative electrode potential, another corresponding point of the linear function in the planar rectangular coordinate system can be determined according to a preset logarithm of the second current and the second negative electrode potential, a straight line can be determined by the two points, an image of the linear function in the planar rectangular coordinate system can be determined by the two points, the relationship between the negative electrode potential and the current can be determined, and the corresponding relationship between the current and the charge state can be determined by combining the corresponding relationship between the charge state and the negative electrode potential, so that lithium analysis windows corresponding to different currents can be determined.
In the method for detecting lithium deposition in a battery according to this embodiment, based on the obtained correspondence between the states of charge and the negative electrode potentials, a first negative electrode potential and a second negative electrode potential respectively corresponding to the obtained first state of charge and the obtained second state of charge are determined, and according to the preset first current, the preset second current, the first negative electrode potential and the second negative electrode potential, the relationship between the negative electrode potentials and the currents is determined, so as to determine lithium deposition windows corresponding to different currents based on the relationship between the negative electrode potentials and the currents and the correspondence between the states of charge and the negative electrode potentials. Compared with the existing battery lithium analysis detection method, the battery lithium analysis detection method provided by the embodiment can determine the lithium analysis windows corresponding to different currents based on the relationship between the negative electrode potential and the current and the corresponding relationship between the charge state and the negative electrode potential, and does not need to test the charge state of the battery corresponding to each current one by one, so that the efficiency and convenience of battery lithium analysis detection are improved.
Example two
Fig. 2 is a flowchart of a battery lithium analysis detection method according to a second embodiment of the present invention, where this embodiment is applicable to aspects of lithium analysis detection and the like of a battery, such as a three-electrode battery, and the method may be executed by a battery lithium analysis detection apparatus, where the apparatus may be implemented by software and/or hardware, and the apparatus may be integrated in an electronic device with a battery lithium analysis detection function, such as a computer, and the method specifically includes the following steps:
and step 210, acquiring the corresponding relation between the charge state and the negative electrode potential of the three-electrode battery in the charging process.
Specifically, the battery test system can charge the three-electrode battery at a preset multiplying power of the capacity of the three-electrode battery, for example, the three-electrode battery is charged at a multiplying power of C1 of the capacity C of the three-electrode battery, and the value range of C1 is 0.01C-0.1C. The battery lithium precipitation detection device can acquire parameters such as the capacity, the positive and negative electrode potentials, the battery voltage and the like of the three-electrode battery in the charging process through a port electrically connected with the three-electrode battery, the difference between the positive electrode potential and the negative electrode potential is the battery voltage, the acquired capacity is the residual capacity of the three-electrode battery, the ratio of the residual capacity to the total capacity is the value of the charge state, the charge state and the negative electrode potential of the three-electrode battery in the charging process can be acquired, and the corresponding relation between the charge state and the negative electrode potential of the three-electrode battery in the charging process is determined.
The preset first current is the minimum current in the target lithium analysis window, the value range of the state of charge in the target lithium analysis window is the preset target range, and the minimum current in the target lithium analysis window is the current corresponding to the maximum value of the state of charge in the target lithium analysis window. Negative cut-off potential of three-electrode battery
Is 0V,. etaLi+/LiIs 0-200 mV. The battery lithium analysis detection device can acquire parameters such as capacity, voltage and the like of the three-electrode battery in the charging process through the input port electrically connected with the three-electrode battery in the process that the three-electrode battery adopts the preset second current to charge, and when the acquired negative electrode potential is the negative electrode cut-off potential, the acquired capacity is the capacity of the three-electrode battery when the negative electrode potential is the negative electrode cut-off potentialThe ratio is the value of the state of charge, so that the first state of charge when the negative electrode potential of the three-electrode battery is the negative electrode cut-off potential can be obtained.
And step 230, charging the three-electrode battery by adopting a preset second current, and obtaining a second charge state when the negative electrode potential of the three-electrode battery is the negative cut-off potential.
And presetting the second current as the maximum current in the target lithium extraction window. The value range of the state of charge in the target lithium analysis window is a preset target range, and the maximum current in the target lithium analysis window is the current corresponding to the minimum value of the state of charge in the target lithium analysis window. The battery lithium precipitation detection device can acquire parameters such as capacity, voltage and the like of the three-electrode battery in the charging process through an input port electrically connected with the three-electrode battery in the preset second current charging process of the three-electrode battery, when the acquired negative electrode potential is the negative electrode cut-off potential, the acquired capacity is the capacity when the negative electrode potential of the three-electrode battery is the negative electrode cut-off potential, and the ratio of the acquired capacity to the total capacity of the three-electrode battery is the value of the state of charge, so that the second state of charge when the negative electrode potential of the three-electrode battery is the negative electrode cut-off potential can be acquired.
Specifically, fig. 3 is a schematic diagram of changes in negative electrode potential and state of charge when a battery is charged with different currents according to the second embodiment of the present invention, as shown in fig. 3, a preset first current I is adopted1Charging the three-electrode battery, wherein the negative electrode potential of the three-electrode battery is the negative cut-off potential
Corresponding to the first charge state, and adopting a preset second current I2Charging the three-electrode battery, wherein the negative electrode potential of the three-electrode battery is the negative cut-off potential
Corresponding to a second charge state, and presetting a first current I1And presetting a second current I2The respective first and second states of charge are different.
And 240, drawing a relation curve of the charge state and the negative electrode potential based on the acquired corresponding relation of the charge state and the negative electrode potential.
Specifically, fig. 4 is a schematic diagram of a corresponding relationship between a state of charge and a negative electrode potential according to a second embodiment of the present invention, and as shown in fig. 4, an OCV of the negative electrode potential of the three-electrode battery is obtained in a process in which a value of the state of charge SOC is from 0% to 100%Negative poleGradually decreases and approaches 0V. Taking the SOC value as 50% as the abscissa of a point in a rectangular planar coordinate system, and the corresponding negative electrode potential as the ordinate of the point, the position of the point in the rectangular planar coordinate system can be determined, and then a relation curve of the SOC and the negative electrode potential can be drawn by a plurality of different points, the curve in FIG. 4 is the relation curve of the SOC and the negative electrode potential, and the negative electrode potential corresponding to any SOC and the SOC corresponding to any negative electrode potential can be determined by the drawn curves.
And step 250, determining a first negative electrode potential and a second negative electrode potential respectively corresponding to the first charge state and the second charge state according to a relation curve of the charge states and the negative electrode potentials.
Specifically, referring to fig. 4, when the battery lithium separation detection device obtains the first state of charge and the second state of charge, the first negative electrode potential corresponding to the first state of charge and the second negative electrode potential corresponding to the second state of charge may be determined according to the relationship curve between the state of charge and the negative electrode potential shown in fig. 4.
Wherein, the negative electrode potential OCV of the three-electrode batteryNegative poleI is the current of the three-electrode cell, a and b are both coefficients, i.e. the negative electrode potential of the three-electrode cell is a linear function of the logarithm of the current, the values of a and b can be determined from the two sets of current and negative electrode potential values, e.g. -226.08 for a and 123.31 for b.
And step 270, determining the relation between the anode potential and the current according to the values of a and b.
Specifically, fig. 5 is a schematic diagram of a corresponding relationship between current and negative electrode potential according to a second embodiment of the present invention, and when values of a and b are determined, for example, a is-226.08 and b is 123.31, OCV of negative electrode potential of a three-electrode battery can be determinedNegative poleThe logarithm of the current and the negative electrode potential as shown in fig. 5 can be plotted as 123.31 lgI-226.08.
Step 280, determining the corresponding relation between the current and the charge state based on the relation between the negative electrode potential and the current and the corresponding relation between the charge state and the negative electrode potential.
Specifically, with reference to fig. 4 and 5, the negative electrode potential corresponding to the current may be determined according to the corresponding relationship shown in fig. 5, and the state of charge corresponding to the negative electrode potential may be determined according to the relationship curve shown in fig. 4, so that the corresponding relationship between the current and the state of charge may be determined.
And 290, determining lithium analysis windows corresponding to different currents according to the corresponding relation between the current and the charge state.
Specifically, when the current is 120A, the corresponding negative electrode potential in fig. 5 is 52.0mV, and the corresponding state of charge SOC in fig. 4 is 65%, and the state of charge SOC value corresponding to the current I is shown in table 1.
TABLE 1 lithium analysis windows for different currents
| I/A | OCV/ | SOC | |
| 130 | 56.3 | 61％ | |
| 120 | 52.0 | 65％ | |
| 110 | 47.4 | 69％ | |
| 100 | 42.3 | 73％ | |
| 90 | 36.6 | 76％ | |
| 80 | 30.3 | 80％ |
The battery lithium deposition detection method provided in this embodiment draws a relation curve between the state of charge and the negative electrode potential based on the obtained correspondence between the state of charge and the negative electrode potential, determines a first negative electrode potential and a second negative electrode potential corresponding to the first state of charge and the second state of charge respectively according to the relation curve between the state of charge and the negative electrode potential, determines a relation between the negative electrode potential and the current according to a preset first current, a preset second current, the first negative electrode potential and the second negative electrode potential, and determines a correspondence between the current and the state of charge based on the relation between the negative electrode potential and the current and the correspondence between the state of charge and the negative electrode potential, thereby determining lithium deposition windows corresponding to different currents according to the correspondence between the current and the state of charge. Compared with the existing battery lithium analysis detection method, the battery lithium analysis detection method provided by the embodiment can determine the lithium analysis windows corresponding to different currents based on the relationship between the negative electrode potential and the current and the corresponding relationship between the charge state and the negative electrode potential, and does not need to test the charge state of the battery corresponding to each current one by one, so that the efficiency and convenience of battery lithium analysis detection are improved.
EXAMPLE III
Fig. 6 is a block diagram of a battery lithium analysis detection device according to a third embodiment of the present invention, where the battery lithium analysis detection device includes: a potential acquisition module 310, a first state of charge acquisition module 320, a second state of charge acquisition module 330, a potential determination module 340, and a window determination module 350; the potential acquiring module 310 is configured to acquire a corresponding relationship between a charge state and a negative potential of the three-electrode battery during charging; the first charge state acquisition module 320 is configured to charge the three-electrode battery by using a preset first current, and acquire a first charge state when a negative electrode potential of the three-electrode battery is a negative cut-off potential; the second state of charge obtaining module 330 is configured to charge the three-electrode battery with a preset second current, and obtain a second state of charge when the negative electrode potential of the three-electrode battery is a negative cut-off potential; the potential determining module 340 is configured to determine a first negative electrode potential and a second negative electrode potential corresponding to the first charge state and the second charge state, respectively, based on a corresponding relationship between the charge states and the negative electrode potentials; wherein the negative electrode potential is positively correlated with the logarithm of the current; the window determining module 350 is configured to determine a relationship between the negative electrode potential and the current according to a preset first current, a preset second current, the first negative electrode potential and the second negative electrode potential, and determine lithium analysis windows corresponding to different currents based on the relationship between the negative electrode potential and the current and a corresponding relationship between the state of charge and the negative electrode potential.
Optionally, the potential determining module 340 includes a curve drawing unit and a potential determining unit; the curve drawing unit is used for drawing a relation curve of the charge state and the negative electrode potential based on the acquired corresponding relation of the charge state and the negative electrode potential; the potential determining unit is used for determining a first negative electrode potential and a second negative electrode potential corresponding to the first charge state and the second charge state respectively according to a relation curve of the charge states and the negative electrode potentials.
In one embodiment, the window determination module 350 includes a numerical determination unit and a relationship determination unit;wherein the value determination unit is used for presetting the first current I1And a first negative electrode potential OCVMinus 1Substituted OCVNegative poleA + blgI, and a second current I is preset2And a second negative electrode potential OCVMinus 2Substituted OCVNegative poleA + blgI, yielding values for a and b; the relation determining unit is used for determining the relation between the negative electrode potential and the current according to the values of a and b; wherein, the negative electrode potential OCV of the three-electrode batteryNegative poleI is the current, and a and b are both coefficients.
Preferably, the window determining module 350 includes a correspondence determining unit and a window determining unit; the corresponding relation determining unit is used for determining the corresponding relation between the current and the charge state based on the relation between the negative electrode potential and the current and the corresponding relation between the charge state and the negative electrode potential; the window determining unit is used for determining lithium analysis windows corresponding to different currents according to the corresponding relation between the current and the charge state.
Preferably, the battery lithium analysis detection device further comprises a corresponding relation determination module, and the corresponding relation determination module is configured to charge the three-electrode battery with a preset multiplying power of the capacity of the three-electrode battery, and determine a corresponding relation between the state of charge of the three-electrode battery and the negative electrode potential during the charging process. The three-electrode battery is charged at the rate of C1 of the capacity C of the three-electrode battery, and the value range of C1 is 0.01C-0.1C.
The battery lithium analysis detection device provided by the embodiment and the battery lithium analysis detection method provided by any embodiment of the invention belong to the same inventive concept, have corresponding beneficial effects, and detailed technical details in the embodiment are not shown in the battery lithium analysis detection method provided by any embodiment of the 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 detecting lithium deposition in a battery, comprising:
acquiring the corresponding relation between the charge state and the negative electrode potential of the three-electrode battery in the charging process;
charging the three-electrode battery by adopting a preset first current to obtain a first charge state when the negative electrode potential of the three-electrode battery is a negative cut-off potential;
charging the three-electrode battery by adopting a preset second current to obtain a second charge state when the negative electrode potential of the three-electrode battery is a negative cut-off potential;
determining a first negative electrode potential and a second negative electrode potential respectively corresponding to the first charge state and the second charge state based on the corresponding relation between the charge states and the negative electrode potentials; wherein the negative electrode potential is positively correlated with the logarithm of the current;
and determining the relation between the negative electrode potential and the current according to the preset first current, the preset second current, the first negative electrode potential and the second negative electrode potential, and determining lithium precipitation windows corresponding to different currents based on the relation between the negative electrode potential and the current and the corresponding relation between the charge state and the negative electrode potential.
2. The method according to claim 1, wherein the determining, based on the correspondence between the states of charge and the negative electrode potentials, a first negative electrode potential and a second negative electrode potential corresponding to the first state of charge and the second state of charge, respectively, comprises:
drawing a relation curve of the charge state and the negative electrode potential based on the obtained corresponding relation of the charge state and the negative electrode potential;
and determining a first negative electrode potential and a second negative electrode potential respectively corresponding to the first charge state and the second charge state according to a relation curve of the charge states and the negative electrode potentials.
3. The method according to claim 1, wherein the determining a relationship between a negative electrode potential and a current according to the preset first current, the preset second current, the first negative electrode potential and the second negative electrode potential comprises:
setting the preset first current I1And said first negative electrode potential OCVMinus 1Substituted OCVNegative poleA + blgI and applying said preset second current I2And said second negative electrode potential OCVMinus 2Substituted OCVNegative poleA + blgI, yielding values for a and b;
determining the relation between the potential of the negative electrode and the current according to the values of a and b; wherein the negative electrode potential OCV of the three-electrode batteryNegative poleI is the current, and a and b are both coefficients.
4. The method for detecting lithium deposition from a battery according to claim 1, wherein the determining lithium deposition windows corresponding to different currents based on the relationship between the negative electrode potential and the current and the corresponding relationship between the state of charge and the negative electrode potential comprises:
determining a corresponding relation between the current and the charge state based on the relation between the negative electrode potential and the current and the corresponding relation between the charge state and the negative electrode potential;
and determining lithium analysis windows corresponding to different currents according to the corresponding relation between the current and the charge state.
5. The method for detecting lithium evolution in a battery according to claim 1, wherein before obtaining the corresponding relationship between the state of charge and the negative electrode potential of the three-electrode battery during charging, the method comprises:
and charging the three-electrode battery by using the preset multiplying power of the capacity of the three-electrode battery, and determining the corresponding relation between the charge state and the negative electrode potential of the three-electrode battery in the charging process.
6. The method for detecting lithium deposition in a battery of claim 5, wherein the three-electrode battery is charged at a rate of C1 of the capacity C of the three-electrode battery, and the value range of C1 is 0.01C-0.1C.
7. The method for detecting lithium extracted from a battery according to claim 1, wherein the preset first current and the preset second current are respectively a minimum current and a maximum current corresponding to a target lithium extraction window.
8. The method for detecting lithium deposition from a battery according to claim 1, wherein the negative cut-off potential Φ of the three-electrode batteryNegative pole＝ELi+/Li-ηLi+/Li，ELi+/LiIs 0V,. etaLi+/LiIs 0-200 mV.
9. A battery lithium deposition detection device, comprising:
the potential acquisition module is used for acquiring the corresponding relation between the charge state and the negative electrode potential of the three-electrode battery in the charging process;
the first charge state acquisition module is used for charging the three-electrode battery by adopting a preset first current and acquiring a first charge state when the negative electrode potential of the three-electrode battery is a negative cut-off potential;
the second charge state acquisition module is used for charging the three-electrode battery by adopting a preset second current and acquiring a second charge state when the negative electrode potential of the three-electrode battery is a negative cut-off potential;
the potential determining module is used for determining a first negative electrode potential and a second negative electrode potential which respectively correspond to the first charge state and the second charge state based on the corresponding relation between the charge states and the negative electrode potentials; wherein the negative electrode potential is positively correlated with the logarithm of the current;
and the window determining module is used for determining the relation between the negative electrode potential and the current according to the preset first current, the preset second current, the first negative electrode potential and the second negative electrode potential, so as to determine lithium analysis windows corresponding to different currents based on the relation between the negative electrode potential and the current and the corresponding relation between the charge state and the negative electrode potential.
10. The battery lithium analysis detection device according to claim 9, wherein the potential determination module comprises:
the curve drawing unit is used for drawing a relation curve of the charge state and the negative electrode potential based on the acquired corresponding relation of the charge state and the negative electrode potential;
and the potential determining unit is used for determining a first negative electrode potential and a second negative electrode potential corresponding to the first charge state and the second charge state respectively according to the relation curve of the charge states and the negative electrode potentials.
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