CN112180260A - Battery lithium analysis window analysis method, lithium analysis detection method, device and storage medium - Google Patents
Battery lithium analysis window analysis method, lithium analysis detection method, device and storage medium Download PDFInfo
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- 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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- G—PHYSICS
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- 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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- G—PHYSICS
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- 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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Abstract
The invention discloses a battery lithium analysis window analysis method, a lithium analysis detection method, equipment and a storage medium, wherein the battery lithium analysis window analysis method comprises the following steps: acquiring a plurality of test potential values of lithium precipitation of the test cell under different preset charge state values, different preset temperatures and different preset current values; constructing a lithium analysis relational expression according to a plurality of test potential values corresponding to different preset charge state values, different preset temperatures and different preset current values; and receiving and substituting the test state of charge value and the test temperature value into a lithium analysis relational expression to obtain a lithium analysis window. According to the invention, the lithium analysis relational expression is constructed according to a plurality of test potential values corresponding to different preset charge state values, different preset temperatures and different preset current values, and then the test charge state values and the test temperatures are substituted into the lithium analysis relational expression to obtain an accurate lithium analysis window, so that a user can conveniently and accurately judge whether the lithium analysis phenomenon occurs in the battery cell according to the lithium analysis window.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a battery lithium analysis window analysis method, a lithium analysis detection method, a device and a storage medium.
Background
Lithium ion batteries cannot be charged in environments with temperatures below 0 c, although normal charging may be shown, metallic lithium may precipitate on the surface of the anode. This process is irreversible, and if the charging is repeated at a low temperature, damage may be caused to the battery, and the safety of the battery may be lowered, particularly when the battery is subjected to external impact, or the like.
The lithium analysis detection means commonly used in the industry at present are a morphology observation method and an external characteristic method. The topography method requires a large number of disassembled batteries, which can damage the batteries and increase the cost of battery testing. The external characteristic method is easy to operate, the electric core does not need to be disassembled, but the electric signal response is weak, and the test cost is high. Because the main reasons for lithium precipitation are the kinetics of Li + intercalation reaction and the reduction of diffusion rate in the solid phase of the negative electrode material, the polarization increases, resulting in a larger overpotential of the negative electrode, and lithium precipitation and lithium crystallization occur when the negative electrode potential reaches the lithium precipitation potential. At present, the lithium deposition potential is considered to be 0V, but negative lithium deposition potential shift caused by polarization in the actual charging process results in that the charging current is slightly small and part of pulse performance is lost in the BMS application strategy, so that deviation exists in the judgment of the lithium deposition potential, and further, errors also exist in the judgment of the lithium deposition of the battery.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a battery lithium separation window analysis method which can break a battery lithium separation window, so that whether the battery separates lithium is simple and easy to judge.
The invention also provides a battery lithium analysis detection method.
The invention further provides the electronic equipment.
The invention also provides a computer readable storage medium.
In a first aspect, an embodiment of the present invention provides a method for analyzing a lithium analysis window of a battery, including:
acquiring a plurality of test potential values of lithium precipitation of the test cell under different preset charge state values, different preset temperatures and different preset current values;
constructing a lithium analysis relational expression according to a plurality of test potential values corresponding to different preset charge state values, different preset temperatures and different preset current values;
and receiving and substituting the test state of charge value and the test temperature value into the lithium analysis relational expression to obtain a lithium analysis window.
The battery lithium analysis window analysis method provided by the embodiment of the invention at least has the following beneficial effects: the lithium analysis relational expression is constructed according to a plurality of test potential values corresponding to different preset charge state values, different preset temperatures and different preset current values, and then the test charge state values and the preset test temperatures are substituted into the lithium analysis relational expression to obtain an accurate lithium analysis window, so that a user can accurately judge whether the lithium analysis phenomenon occurs in the battery cell according to the lithium analysis window.
According to other embodiments of the present invention, the lithium analysis window comprises a lithium analysis current window and a lithium analysis voltage window.
According to another embodiment of the present invention, a method for analyzing a lithium analysis window of a battery, which constructs a lithium analysis relation according to a plurality of test potential values corresponding to different preset state of charge values, different preset temperatures, and different preset current values, includes:
acquiring a lithium analysis potential value of the test cell when the test cell is charged at the same preset state of charge value and the same preset temperature at different preset current values to generate lithium analysis;
acquiring a lithium analysis current value corresponding to the lithium analysis bit values according to the lithium analysis bit values;
and obtaining a plurality of lithium analysis current values at different preset charge state values and different preset temperatures, and fitting to obtain a lithium analysis relational expression.
According to another embodiment of the present invention, the method for analyzing a lithium analysis window of a battery, wherein the method for constructing a lithium analysis relation according to a plurality of test potential values corresponding to different preset state of charge values, different preset temperatures, and different preset current values further includes:
and adjusting the capacity of the test cell to the preset charge state value, and obtaining the lithium precipitation potential value after the test cell is static at the preset temperature for the preset time.
According to other embodiments of the present invention, a method for analyzing a lithium analysis window of a battery further comprises:
substituting a preset test state of charge value and a test temperature into the lithium analysis relational expression to obtain a lithium analysis voltage window;
acquiring the inspection state of charge value and an inspection potential value when the inspection cell is charged with different preset inspection current values at the inspection temperature and performs lithium precipitation on the inspection cell;
and if the check potential value is positioned in the lithium analysis voltage window, acquiring the check current value corresponding to the check potential value to determine an optimized lithium analysis current window.
According to another embodiment of the present invention, a method for analyzing a lithium analysis window of a battery, the test cell is a three-electrode cell, and the three-electrode cell includes: the substrate is a copper wire pretreated by sulfuric acid.
According to the battery lithium separation window analysis method in other embodiments of the present invention, the reference electrode of the three-electrode cell is a lithium metal reference electrode, and the lithium metal reference electrode is determined by uniformly plating a copper wire with lithium through a preset low-current constant current charging for 8 hours.
In a second aspect, an embodiment of the present invention provides a method for detecting lithium deposition in a battery, including:
obtaining a lithium analysis window of the battery lithium analysis window analysis method according to the first aspect;
and acquiring the negative electrode potential of the test battery cell, and if the negative electrode potential is positioned in the lithium analysis window, judging that the lithium analysis occurs in the test battery cell.
The battery lithium analysis detection method provided by the embodiment of the invention at least has the following beneficial effects: through the lithium analysis window obtained through the first aspect, a user can directly judge whether the lithium analysis phenomenon occurs in the battery cell according to the lithium analysis window, so that the lithium analysis phenomenon is easy to judge.
In a third aspect, an embodiment of the present invention provides a battery lithium deposition control apparatus including:
at least one processor, and,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a battery analysis window analysis method as in the first aspect or a battery analysis detection method as in the second aspect.
The battery lithium separation control device provided by the embodiment of the invention at least has the following beneficial effects: the battery lithium analysis window analysis method according to the first aspect or the battery lithium analysis detection method according to the second aspect is executed by a processor, so that the battery lithium analysis window analysis method or the battery lithium analysis detection method is easy to implement.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions for causing a computer to perform a battery analysis window analysis method as in the first aspect or a battery analysis lithium detection method as in the second aspect.
The computer-readable storage medium of the embodiment of the invention has at least the following beneficial effects: the computer-executable instructions are used for causing a computer to execute the battery analysis lithium window analysis method according to the first aspect or the battery analysis lithium detection method according to the second aspect, so that the battery analysis lithium window analysis method or the battery analysis lithium detection method is easy to operate.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
FIG. 1 is a schematic flow chart diagram illustrating an exemplary method for analyzing a window for lithium deposition in a battery according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating another embodiment of a method for analyzing a window for analyzing lithium ions in a battery according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart diagram illustrating another embodiment of a method for analyzing a window for analyzing lithium ions in a battery according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart diagram illustrating another embodiment of a method for analyzing a window for analyzing lithium ions from a battery according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart illustrating an embodiment of a method for detecting lithium deposition in a battery according to the present invention;
FIG. 6 is a block diagram of an embodiment of an electronic device;
fig. 7 is a schematic diagram of corresponding lithium analysis potential values at the same preset temperature in an implementation of the method for analyzing a lithium analysis window of a battery according to the embodiment of the present invention;
fig. 8 is a schematic diagram of lithium deposition potential values at different temperatures and different states of charge in an embodiment of the method for analyzing a lithium deposition window of a battery in the embodiment of the present invention.
Detailed Description
The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.
In the description of the present invention, if an orientation description is referred to, for example, the orientations or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", etc. are based on the orientations or positional relationships shown in the drawings, only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. If a feature is referred to as being "disposed," "secured," "connected," or "mounted" to another feature, it can be directly disposed, secured, or connected to the other feature or indirectly disposed, secured, connected, or mounted to the other feature.
In the description of the embodiments of the present invention, if "a number" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "greater than", "lower" or "inner" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.
The lithium battery is widely applied to 3C products and electric vehicles, but the phenomenon of lithium precipitation of the negative electrode can occur under the working conditions of overcharge, quick charge, low-temperature charge and the like, and the service life and the safety of the lithium battery are seriously influenced. Therefore, it is necessary to monitor the lithium deposition rapidly, accurately and reliably.
At present, the lithium analysis detection means commonly used by industry has mainly been a morphology observation method, an external characteristic method and the like. The appearance observation method needs a large amount of disassembled electric cores, which has large destructiveness, increased cost and low efficiency; although the external characteristic method is simple to operate and does not need to disassemble the cell, the electrochemical signal is correspondingly weak, and the method is only suitable for the condition of serious lithium precipitation. In addition, some detection means are used for detecting lithium deposition of the battery, such as nuclear magnetic resonance technology and neutron technology, but the nuclear magnetic resonance technology and the neutron technology are expensive in equipment, high in test cost and not suitable for commercial use.
The main reasons for the lithium separation of the battery are that the kinetics of Li + intercalation reaction and the diffusion rate in the solid phase of the negative electrode material are reduced, the polarization is increased, the over potential of the negative electrode is larger, and the lithium separation and the generation of lithium dendrite can occur when the potential of the negative electrode reaches the lithium separation potential. At present, the potential of the lithium analysis is considered to be 0V, and the potential change of the lithium analysis caused by polarization in the actual charging process is not considered, so that the charging current in the application strategy of the CMS is smaller, and part of pulse performance is lost. Therefore, the judgment of the lithium analysis potential is wrong, and the judgment of whether the lithium analysis of the battery is inaccurate is further carried out.
Based on the above, the application discloses a lithium battery lithium analysis window analysis method, which can calculate a lithium analysis window of a battery cell according to a state of lithium analysis of the battery cell so as to obtain an accurate lithium analysis window.
In a first aspect, referring to fig. 1, an embodiment of the present invention discloses a method for analyzing a lithium deposition window of a battery, including:
s100, obtaining a plurality of test potential values for testing lithium precipitation of the battery cell under different preset charge state values, different preset temperatures and different preset current values;
s200, constructing a lithium analysis relational expression according to a plurality of test potential values corresponding to different preset charge state values, different preset temperatures and different preset current values;
s300, receiving and substituting the test state of charge value and the test temperature value into a lithium analysis relational expression to obtain a lithium analysis window.
Because the negative pole lithium analysis phenomenon can only occur under the conditions of overcharging, quick charging and low temperature of the test battery cell, the lithium analysis window of the test battery cell is determined according to the relevant factors of the lithium analysis phenomenon generated by the test battery cell. Because the phenomenon of lithium separation of the test battery core belongs to the internal phenomenon, the test battery core needs to be disassembled to judge whether the battery core has lithium separation, and a large number of batteries can be damaged. Based on the above, the lithium separation phenomenon occurs under different charge state values, temperatures and currents according to the test cell, and then the potential value of the lithium separation phenomenon occurring under the condition is obtained. Therefore, the potential value of the test cell under the corresponding state of charge value, temperature and current is only needed to be judged, and if the potential value of the test cell is lower than the potential value obtained by measurement in advance, the test cell can be considered to generate lithium analysis, so that the judgment of whether the test cell generates the lithium analysis phenomenon is simple.
Because the lithium separation phenomenon can occur when the test battery cell is overcharged under different charge states, the lithium separation phenomenon can also occur when the test battery cell is overcharged under different temperatures, and the lithium separation can also occur when the current for charging the test battery cell is too high. Therefore, the test cell is charged by using different preset current values at different preset charge state values and different preset temperatures, a plurality of test potential values corresponding to lithium analysis of the test cell at different preset charge state values, different preset temperatures and different preset current values are obtained, and then the lithium analysis relation is constructed according to the different preset charge state values, the different preset temperatures and the plurality of test potential values corresponding to the different preset current values to obtain a lithium analysis relation, wherein the lithium analysis relation is a three-dimensional relation, and the lithium analysis relation is a lithium analysis window corresponding to the different charge state values and the different temperatures. Therefore, if the lithium analysis window of a certain test cell needs to be judged, the test state of charge value and the test temperature of the test cell are obtained, and then the test state of charge value and the test temperature are substituted into the lithium analysis relational expression to obtain the lithium analysis window of the test cell. Therefore, a plurality of test cells are selected to be charged at different preset current values at different preset charge state values and different preset temperatures so as to obtain test potential values of the test cells for lithium analysis, and then a lithium analysis relational expression of the test cells can be constructed through a plurality of test potential values corresponding to different preset charge state values, different preset temperatures and different preset current values, so that the lithium analysis window corresponding to any one test cell at any charge state value and at any temperature can be calculated according to the constructed lithium analysis relational expression, whether the lithium analysis phenomenon occurs in the test cell can be conveniently judged according to the lithium analysis window of the test cell, whether the lithium analysis phenomenon occurs in the test cell is judged by the test cell, the test cell does not need to be detached, the operation is simple, and the cost is saved.
In some embodiments, the test cell is a three-electrode cell comprising a substrate, and the substrate is a sulfuric acid pretreated copper wire. The three-electrode cell comprises a soft-package three-electrode cell or an aluminum-shell three-electrode cell. The three-electrode cell is adopted as a test cell, so that the test cell can be reused, and further the cost is saved.
In some embodiments, the reference electrode of the three-electrode cell is a lithium metal reference electrode, and the lithium metal reference electrode is determined by uniformly lithium-plating the copper wire through preset low-current constant current charging for 8 hours.
Wherein, the reference electrode is used as a reference electrode for comparison when measuring various electrode potentials. The electrode potential of the electrode to be measured can be calculated by forming a cell by the electrode to be measured and a reference electrode with an accurately known electrode potential value and measuring the electromotive force value of the cell. By using the lithium metal reference electrode as the reference electrode of the test battery cell, the test potential value of the test battery cell can be detected more accurately.
In some embodiments, the lithium analysis window includes a lithium analysis current window and a lithium analysis voltage window, and the lithium analysis current window is obtained to control the charging current of the test cell at the corresponding state of charge value and temperature, so as to avoid the lithium analysis phenomenon of the cell. The potential value of the lithium analysis phenomenon of the test cell under the corresponding charge state value and temperature can be judged through the lithium analysis voltage window, and whether the lithium analysis phenomenon of the test cell occurs or not can be judged without disassembling the test cell.
Referring to fig. 2, in some embodiments, step S200 includes:
s210, acquiring a lithium precipitation potential value of a test cell when the test cell is charged at different preset current values at the same preset charge state value and the same preset temperature to cause lithium precipitation;
s220, acquiring a plurality of lithium analysis current values corresponding to the plurality of lithium analysis current values according to the plurality of lithium analysis current values;
and S230, obtaining different preset charge state values and a plurality of lithium analysis current values at different preset temperatures, and fitting to obtain a lithium analysis relational expression.
The test cell is charged at different preset current values under the same preset state of charge value and the same preset temperature, a lithium analysis current value corresponding to the lithium analysis current value is obtained according to the lithium analysis current value, and the lithium analysis current value of the lithium analysis phenomenon which can occur by the test cell under the preset state of charge value and preset temperature is obtained. And then, according to the same manner of obtaining the lithium analysis current values, obtaining a plurality of corresponding lithium analysis current values at different charge state values and different temperatures, and then fitting according to the plurality of lithium analysis current values to construct a lithium analysis relational expression between the lithium analysis current values and the charge state values and the temperatures, so that the lithium analysis relational expression is accurate.
For example, the SOC is 40%, the test battery cell is charged with different preset current values at a constant temperature room of 25 ℃, specifically, the test battery cell is charged with pulses of 40/250/260/270/280a, test voltage values corresponding to different preset current values are obtained, and then the test battery cell is disassembled and verified to obtain a lithium analysis potential value when the test battery analyzes lithium. According to the lithium analysis potential value, a lithium analysis current value corresponding to the lithium analysis potential value can be obtained, and a lithium analysis current window and a lithium analysis voltage window of the battery under the conditions that the SOC is 40% and the temperature is 25 ℃ can be known. According to the traditional method, the value of the lithium analysis potential is considered to be 0, the corresponding value of the lithium analysis current is 123A, the SOC is 40%, and the value of the lithium analysis voltage obtained by a constant temperature test at 25 ℃ is-141 mV, so that the corresponding value of the lithium analysis current is 260A, and the traditional method can be used for judging that the lithium analysis phenomenon of the tested battery cell has great deviation with the lithium analysis phenomenon of the actually tested battery cell. And according to the mode of obtaining the lithium analysis current value, obtaining the corresponding lithium analysis current values at different preset charge state values and different preset temperatures. In this embodiment, the test cell is an HEV cell, and the negative lithium-out potentials of the HEV cell at 0 ℃ and-30 ℃ are about-130 mV and-120 mV, respectively, and the lithium-out current values obtained at different preset state of charge values and different preset temperatures are shown in table 1, and the corresponding lithium-out potential values at the same preset temperature according to different preset state of charge values are shown in fig. 7. As can be seen from the graph, the higher the SOC, the lower the negative electrode OCV, the more the releasable pulse performance, and therefore the lower the lithium deposition voltage value.
TABLE 1 lithium extraction Window map of certain HEV cell
| T/ |
40％ | 50％ | 60％ | 70％ | 80％ | 90％ |
| -30℃ | 9 | 9 | 8 | 7 | 6 | 5 |
| -25℃ | 14 | 13 | 12 | 10 | 9 | 7 |
| -20℃ | 22 | 20 | 17 | 16 | 14 | 12 |
| -15℃ | 30 | 28 | 25 | 23 | 20 | 18 |
| -10℃ | 42 | 40 | 38 | 34 | 30 | 26 |
| -5 |
60 | 57 | 53 | 47 | 41 | 34 |
| 0℃ | 85 | 80 | 75 | 65 | 55 | 45 |
| 5℃ | 118 | 112 | 106 | 92 | 78 | 64 |
| 10℃ | 165 | 157 | 150 | 130 | 110 | 90 |
| 15℃ | 192 | 182 | 175 | 155 | 132 | 110 |
| 20℃ | 223 | 211 | 205 | 185 | 158 | 135 |
| 25℃ | 260 | 245 | 240 | 220 | 190 | 165 |
According to the table 1, the lithium analysis current values are fitted to construct a lithium analysis relational expression among the state of charge value, the temperature and the lithium analysis current values, wherein the lithium analysis current values correspond to the lithium analysis current values at different preset states of charge values and different preset temperatures. Fig. 8 shows a three-dimensional model of fig. 8, and it can be seen from fig. 5 that the higher the temperature, the higher the value of the lithium deposition current, and the higher the value of the state of charge, the lower the value of the lithium deposition current. Therefore, a lithium analysis relational expression is constructed through lithium analysis current values obtained by different preset state of charge values and different preset temperature values, and a lithium analysis window corresponding to the type of test cell at which state of charge value and which temperature can be obtained.
Referring to fig. 3, in some embodiments, step S200 further comprises:
s240, adjusting the capacity of the test cell to a preset state of charge value, and obtaining a lithium analysis cell value after the test cell is static at a preset temperature for a preset time.
When the lithium analysis electric potential value is obtained, the capacity of the test electric core is adjusted to the preset charge state value, and then the test electric core is static for the preset time to obtain the lithium analysis electric potential value, so that the obtained lithium analysis electric potential value is more accurate.
For example, after the test cell is adjusted to have an SOC of 40%, the test cell is controlled to be stationary in a constant temperature room at 25 ℃ for a preset time, in this embodiment, the preset time is 1 hour, and then the test cell is charged at different preset current values. The test cells are charged with different preset current values as pulse charging, and the pulse charging time is 10S in the embodiment, so that the condition that lithium analysis can occur when each test cell is subjected to different preset current values can be quickly judged, and the lithium analysis potential value can be quickly obtained.
Referring to fig. 4, in some embodiments, the battery lithium analysis window analysis method further comprises:
s400, substituting a preset test state of charge value and a test temperature into a lithium analysis relational expression to obtain a lithium analysis voltage window;
s500, acquiring a test state of charge value and a test potential value when different preset test current values charge a test cell at a test temperature and the cell separates lithium;
s600, if the plurality of inspection potential values are located in the lithium analysis voltage window, acquiring a plurality of inspection current values corresponding to the inspection potential values to determine an optimized lithium analysis current window.
Because the lithium analysis relational expression is directly obtained and then the lithium analysis window obtained by directly substituting the lithium analysis relational expression into the test state of charge value and the test temperature does not necessarily accord with each battery, whether the lithium analysis window is correct or not needs to be further verified so as to improve the accuracy of the lithium analysis window.
Specifically, a lithium analysis current window is obtained by substituting a preset inspection state of charge value and an inspection temperature into a lithium analysis relational expression, and a lithium analysis voltage window is correspondingly obtained according to the lithium analysis window. And then, charging the inspection cell at different inspection current values at an inspection temperature and an inspection state of charge value, disassembling and verifying the inspection cell to obtain an inspection voltage value corresponding to a lithium analysis phenomenon of the inspection cell, judging that the inspection is successful if the inspection potential value is smaller than a lithium analysis voltage window, and optimizing the lithium analysis current window corresponding to the inspection voltage window. And if the inspection potential value is larger than the lithium analysis voltage window, the lithium analysis voltage window is considered to be incorrect, and the lithium analysis relational expression is recalculated to obtain the lithium analysis window again. Therefore, whether the lithium analysis window obtained by the currently obtained lithium analysis relational expression is correct or not is checked through the checking cell, so that the accuracy of the lithium analysis window analysis is improved.
The method for analyzing a lithium deposition window of a battery according to an embodiment of the present invention is described in detail with reference to fig. 1 to 4 as a specific example. It is to be understood that the following description is only exemplary, and not a specific limitation of the invention.
The copper wire pretreated by sulfuric acid is used as a substrate of the three-electrode cell, and then the copper wire is uniformly plated with lithium by charging for 8 hours at a preset low current constant current so as to determine the lithium metal reference electrode. The testing battery cell is static at the same preset charge state value and the same preset temperature for preset time, then the testing battery cell is charged by different preset current values, a lithium analysis current value when the testing battery cell generates a lithium analysis phenomenon is obtained, and a lithium analysis current value corresponding to the lithium analysis current value is obtained according to the lithium analysis current value. And then acquiring a plurality of lithium analysis current values corresponding to different preset charge state values and different preset temperatures, and fitting the plurality of lithium analysis current values to construct a lithium analysis relation among the charge state values, the temperatures and the lithium analysis current values. And substituting the preset test state of charge value and the test temperature into the lithium analysis relational expression to obtain a lithium analysis current window, and correspondingly obtaining a lithium analysis voltage window according to the lithium analysis window. The method comprises the steps of obtaining different inspection current values for charging an inspection electric core at an inspection temperature and an inspection state of charge value, then disassembling and verifying the inspection electric core to obtain an inspection voltage value corresponding to the phenomenon that lithium is analyzed in the inspection electric core, judging that the inspection is successful if the inspection potential value is smaller than a lithium analysis voltage window, and analyzing the lithium current window by optimizing the lithium analysis current window corresponding to the inspection voltage window.
Referring to fig. 5, in a second aspect, an embodiment of the present invention further discloses a method for detecting lithium deposition in a battery, including:
s700, obtaining a lithium analysis window of the battery lithium analysis window analysis method in the first aspect;
and S800, acquiring the negative electrode potential of the test battery cell, and if the negative electrode potential is located in the lithium analysis window, judging that lithium analysis occurs in the test battery cell.
By obtaining the lithium analysis window of the battery lithium analysis window analysis method of the first aspect, when the lithium analysis phenomenon is judged for the test battery cell, only the corresponding lithium analysis window under the state of charge value and the temperature needs to be obtained, whether the negative electrode potential of the current test battery cell is located in the lithium analysis window is judged, if so, the test battery cell is considered to generate lithium analysis, and whether the lithium analysis phenomenon is generated by the battery cell is judged simply.
And the operation process of the battery lithium analysis window analysis method is as the battery lithium analysis window analysis method of the first aspect, which is not described herein again.
Referring to fig. 6, in a third aspect, an embodiment of the present invention further discloses an electronic device, including:
at least one processor 100, and,
a memory 200 communicatively coupled to the at least one processor; wherein,
the memory 200 stores instructions executable by the at least one processor 100 to enable the at least one processor 100 to perform a battery analysis window analysis method as the first aspect or a battery analysis detection method as the second aspect.
The electronic device may be a mobile terminal device or a non-mobile terminal device. The mobile terminal equipment can be a mobile phone, a tablet computer, a notebook computer, a palm computer, vehicle-mounted terminal equipment, wearable equipment, a super mobile personal computer, a netbook, a personal digital assistant, CPE, UFI (wireless hotspot equipment) and the like; the non-mobile terminal equipment can be a personal computer, a television, a teller machine or a self-service machine and the like; the embodiments of the present invention are not particularly limited.
The memory 200 may be an external memory or an internal memory, and the external memory is an external memory card, such as a Micro SD card. The external memory card communicates with the processor through the external memory interface to realize the data storage function. For example, files such as music, video, etc. are saved in an external memory card. The internal memory may be used to store computer-executable program code, which includes instructions.
In a fourth aspect, an embodiment of the present invention further discloses a computer-readable storage medium, in which computer-executable instructions are stored, and the computer-executable instructions are configured to enable a computer to execute the battery lithium analysis window analysis method according to the first aspect or the battery lithium analysis detection method according to the second aspect.
The computer-executable instructions are used for causing a computer to execute the battery analysis window analysis method according to the first aspect or the battery analysis lithium detection method according to the second aspect, so that the battery analysis window analysis method or the battery analysis lithium detection method is easy to operate.
The above-described embodiments of the apparatus are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may also be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (10)
1. A battery lithium analysis window analysis method, comprising:
acquiring a plurality of test potential values of lithium precipitation of the test cell under different preset charge state values, different preset temperatures and different preset current values;
constructing a lithium analysis relational expression according to a plurality of test potential values corresponding to different preset charge state values, different preset temperatures and different preset current values;
and receiving and substituting the test state of charge value and the test temperature value into the lithium analysis relational expression to obtain a lithium analysis window.
2. The battery lithium analysis window analysis method according to claim 1, wherein the lithium analysis window comprises a lithium analysis current window and a lithium analysis voltage window.
3. The battery lithium analysis window analysis method according to claim 1 or 2, wherein the step of constructing a lithium analysis relation according to a plurality of test potential values corresponding to different preset state of charge values, different preset temperatures and different preset current values comprises:
acquiring a lithium analysis potential value of the test cell when the test cell is charged at the same preset state of charge value and the same preset temperature at different preset current values to generate lithium analysis;
acquiring a plurality of lithium analysis current values corresponding to the plurality of lithium analysis current values according to the plurality of lithium analysis current values;
and obtaining a plurality of lithium analysis current values at different preset charge state values and different preset temperatures, and fitting to obtain a lithium analysis relational expression.
4. The battery lithium analysis window analysis method according to claim 3, wherein the step of constructing a lithium analysis relation according to a plurality of test potential values corresponding to different preset state of charge values, different preset temperatures and different preset current values further comprises:
and adjusting the capacity of the test cell to the preset charge state value, and obtaining the lithium precipitation potential value after the test cell is static at the preset temperature for the preset time.
5. The battery lithium analysis window analysis method of claim 2, further comprising:
substituting a preset test state of charge value and a test temperature into the lithium analysis relational expression to obtain a lithium analysis voltage window;
acquiring the inspection state of charge value and an inspection potential value when the inspection cell is charged with different preset inspection current values at the inspection temperature and performs lithium precipitation on the inspection cell;
and if the check potential value is positioned in the lithium analysis voltage window, acquiring the check current value corresponding to the check potential value to determine an optimized lithium analysis current window.
6. The battery lithium analysis window analysis method of claim 1, wherein the test cell is a three-electrode cell comprising: the substrate is a copper wire pretreated by sulfuric acid.
7. The battery lithium separation window analysis method according to claim 6, wherein the reference electrode of the three-electrode cell is a lithium metal reference electrode, and the lithium metal reference electrode is determined by uniformly lithium-plating a copper wire through preset low-current constant current charging for 8 hours.
8. A method for detecting lithium deposition in a battery, comprising:
obtaining a lithium analysis window of the battery lithium analysis window analysis method according to any one of claims 1 to 7;
and acquiring the negative electrode potential of the test battery cell, and if the negative electrode potential is positioned in the lithium analysis window, judging that the lithium analysis occurs in the test battery cell.
9. An electronic device, comprising:
at least one processor, and,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the battery window analysis method of any one of claims 1 to 7 or the battery lithium analysis detection method of claim 8.
10. A computer-readable storage medium storing computer-executable instructions for causing a computer to perform the battery lithium analysis window analysis method according to any one of claims 1 to 7 or the battery lithium analysis detection method according to claim 8.
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