CN115508723B - Method and related device for determining charge and discharge cut-off voltage of battery cell - Google Patents
Method and related device for determining charge and discharge cut-off voltage of battery cell Download PDFInfo
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 9
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Classifications
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
According to the method and the related device for determining the charge and discharge cut-off voltage of the battery cell, the analysis equipment obtains the second safety coefficient of the second material according to the preset battery cell safety coefficient of the target battery cell and the first safety coefficient of the first material; and obtaining the cut-off voltage of the target battery cell according to the first voltage and the second voltage of the two materials determined by the two safety coefficients. The first safety coefficient and the first voltage have a first safety relationship which characterizes the change trend of the safety degree of the first material along with the open-circuit voltage during charging; the second safety coefficient and the second voltage have a second safety relationship which represents the change trend of the safety degree of the second material along with the open-circuit voltage during discharging, and the two safety coefficients and the battery cell safety coefficient meet the positively-related constraint condition; therefore, if the two materials are used as the battery cell electrodes, the cut-off voltage required to be provided by the target battery cell can be determined according to the constraint conditions, so that the battery cell reaches the corresponding battery cell safety coefficient.
Description
Technical Field
The application relates to the field of batteries, in particular to a method and a related device for determining a cut-off voltage of charge and discharge of a battery cell.
Background
The lithium ion battery is widely applied to our daily life at present, but different lithium ion batteries have different charge and discharge cut-off voltages and different discharge voltage equalizing values, and the charge and discharge voltage interval of the common lithium ion battery in daily life, such as a lithium iron phosphate battery, is mainly 2V-3.65V; the charge-discharge voltage interval of the ternary lithium ion battery is mainly 2.5V-4.3V.
Wherein, the charge-discharge cut-off voltage of different types of lithium ion batteries is related to the composition of the anode and cathode materials of the lithium batteries. For example, the positive electrode material is a ternary material, the negative electrode material is silicon carbon, and the overall discharge cut-off voltage of the battery can be reduced to 2.5V, 2.3V or even 2V along with the increase of the silicon content in the negative electrode material.
However, with continuous research on lithium ion battery materials, at present, conventional charge-discharge cut-off voltage cannot predict a safe charge-discharge cut-off voltage interval of a battery core when new positive and negative materials possibly appearing in the future are mutually matched into the battery core.
Disclosure of Invention
In order to overcome at least one defect in the prior art, the application provides a method and a related device for determining the charge and discharge cut-off voltage of a battery cell, which are used for determining the safe charge and discharge cut-off voltage of a battery made of a new material so as to ensure that the battery cell reaches a battery cell safety coefficient which needs to be met. The method specifically comprises the following steps:
In a first aspect, the present application provides a method for determining a cut-off voltage of charge and discharge of a battery cell, which is applied to an analysis device, and the method includes:
Acquiring a preset battery cell safety coefficient of a target battery cell and a first safety coefficient of a first material, wherein the first material is used as a first electrode of the target battery cell;
obtaining a second safety coefficient of the second material according to the battery cell safety coefficient and the constraint relation between the first safety coefficient and the second safety coefficient of the second material; the second material is used as a second electrode of the target battery cell, and the first safety coefficient and the second safety coefficient are respectively in positive correlation with the battery cell safety coefficient;
Determining a first voltage when the first material is used as the first electrode according to the first safety coefficient; the first safety coefficient and the first voltage have a first safety relationship, and the first safety relationship represents the change trend of the safety degree of the first material along with the open-circuit voltage during charging;
Determining a second voltage when the second material is the second electrode according to the second safety coefficient; the second safety coefficient and the second voltage have a second safety relationship, and the second safety relationship represents the variation trend of the safety degree of the second material along with the open-circuit voltage during discharge;
and obtaining the cut-off voltage of the target battery cell according to the first voltage and the second voltage.
In a second aspect, the present application provides a device for determining a cut-off voltage of charge and discharge of a battery cell, the device comprising:
The safety coefficient module is used for acquiring a preset battery cell safety coefficient of a target battery cell and a first safety coefficient of a first material, wherein the first material is used as a first electrode of the target battery cell;
The safety coefficient module is further used for obtaining a second safety coefficient of the second material according to the battery cell safety coefficient and the constraint relation between the first safety coefficient and the second safety coefficient of the second material; the second material is used as a second electrode of the target battery cell, and the first safety coefficient and the second safety coefficient are respectively in positive correlation with the battery cell safety coefficient;
A voltage calculation module for determining a first voltage when the first material is the first electrode according to the first safety factor; the first safety coefficient and the first voltage have a first safety relationship, and the first safety relationship represents the change trend of the safety degree of the first material along with the open-circuit voltage during charging;
The voltage calculation module is further used for determining a second voltage when the second material is used as the second electrode according to the second safety coefficient; the second safety coefficient and the second voltage have a second safety relationship, and the second safety relationship represents the variation trend of the safety degree of the second material along with the open-circuit voltage during discharge;
the voltage calculation module is further configured to obtain a cutoff voltage of the target battery cell according to the first voltage and the second voltage.
In a third aspect, the present application provides a computer readable storage medium storing a computer program, which when executed by a processor, implements the method for determining a cut-off voltage of charge and discharge of a battery cell.
In a fourth aspect, the present application provides an analysis apparatus, the analysis apparatus including a processor and a memory, the memory storing a computer program, the computer program implementing the method for determining a cut-off voltage of charge and discharge of a battery cell when executed by the processor.
Compared with the prior art, the application has the following beneficial effects:
According to the method and the related device for determining the charge and discharge cut-off voltage of the battery cell, the analysis equipment obtains the second safety coefficient of the second material according to the preset battery cell safety coefficient of the target battery cell and the first safety coefficient of the first material; determining the first voltage and the second voltage of each of the two materials according to the two safety coefficients respectively; and finally, obtaining the cut-off voltage of the target battery cell according to the first voltage and the second voltage. The first safety coefficient and the first voltage have a first safety relationship which characterizes the change trend of the safety degree of the first material along with the open-circuit voltage during charging; the second safety coefficient and the second voltage have a second safety relationship which represents the change trend of the safety degree of the second material along with the open-circuit voltage during discharging, and the two safety coefficients and the battery cell safety coefficient meet the positively-related constraint condition; therefore, if the two materials are used as the battery cell electrodes, the cut-off voltage required to be provided by the target battery cell can be determined according to the constraint conditions, so that the battery cell reaches the corresponding battery cell safety coefficient.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a charge curve dividing effect according to an embodiment of the present application;
FIG. 3 is a second schematic diagram illustrating a charge curve dividing effect according to an embodiment of the present application;
FIG. 4 is a schematic diagram showing a discharge curve dividing effect according to an embodiment of the present application;
FIG. 5 is a second schematic diagram illustrating a discharge curve dividing effect according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a device according to an embodiment of the present application;
Fig. 7 is a schematic diagram of an apparatus structure according to an embodiment of the present application.
Icon: 101-a safety coefficient module; 102-a voltage calculation module; 201-a memory; 202-a processor; 203-a communication unit.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Based on the above statement, it should be understood that, first, if the section of the charge/discharge cutoff voltage of the battery cell is designed to be narrow, the entire capacity of the battery cannot be exhibited, and if the section of the charge/discharge cutoff voltage is designed to be wide, there is a possibility that overcharge or overdischarge may occur.
For example, in a common lithium ion battery in daily life, such as a lithium iron phosphate battery, the charge-discharge voltage interval is mainly 2V-3.65V; the charge-discharge voltage interval of the ternary lithium ion battery is mainly 2.5V-4.3V. That is, for a lithium iron phosphate battery, the highest voltage when it is charged is limited to 3.65V, and the lowest voltage when it is discharged is limited to 2V; and for a ternary lithium battery, the highest voltage during charging is limited to 4.3V, and the lowest voltage during discharging is limited to 2.5V.
The cut-off voltage of the charge and discharge of the battery is mainly related to the materials of the positive electrode and the negative electrode of the battery cell. For example, the positive electrode material is a ternary material, the negative electrode material is silicon carbon, and the overall discharge cut-off voltage of the battery can be reduced to 2.5V, 2.3V or even 2V along with the increase of the silicon content in the negative electrode material. With continuous research on lithium ion battery materials, the conventional charge-discharge cut-off voltage at present cannot predict the safe charge-discharge cut-off voltage interval of the battery core when new positive and negative materials possibly appearing in the future are mutually matched into the battery core.
It should be noted that the above prior art solutions have all the drawbacks that the inventors have obtained after practice and careful study, and thus the discovery process of the above problems and the solutions to the problems that the embodiments of the present application hereinafter propose should not be construed as what the inventors have made in the inventive process of the present application, but should not be construed as what is known to those skilled in the art.
Therefore, the embodiment provides a method for determining the charge and discharge cut-off voltage of a battery cell, which is applied to analysis equipment, and is used for determining the safe charge and discharge cut-off voltage of the battery cell made of a new material so as to ensure that the battery cell reaches the battery cell safety coefficient to be met. The analysis device may be a user terminal, for example, a mobile terminal, a tablet computer, a laptop computer, a desktop computer, or the like. The mobile terminal may include a smart phone, a Personal digital assistant (Personal DIGITAL ASSISTANT, PDA), or the like, among others.
Based on the above related description, the steps of the method are explained in detail below in connection with fig. 1.
As shown in fig. 1, the method includes:
S101, acquiring a preset battery cell safety coefficient of a target battery cell and a first safety coefficient of a first material.
S102, obtaining a second safety coefficient of the second material according to the battery cell safety coefficient and the constraint relation among the first safety coefficient and the second safety coefficient of the second material.
The first material is used as a first electrode of the target battery cell; the second material is used as a second electrode of the target battery cell, and the first safety coefficient and the second safety coefficient are respectively in positive correlation with the battery cell safety coefficient.
It should be understood here that the battery cell includes a positive electrode and a negative electrode, and when the first electrode in the embodiment is the positive electrode, the second electrode is the negative electrode, and the calculated cut-off voltage is the charging cut-off voltage of the battery cell; when the first electrode is a negative electrode, the second electrode is a positive electrode, and the calculated cut-off voltage is the discharge cut-off voltage of the battery cell.
In addition, the safety coefficient of the battery cell is used for representing the safety degree of the battery cell, and the greater the safety coefficient of the battery cell is, the higher the safety degree of the battery cell is; the first safety coefficient is used for representing the safety degree of the first material, and if the first safety coefficient is large, the higher the safety degree of the first material serving as the first electrode of the battery cell is in operation; the second safety coefficient is used for representing the safety degree of the second material, and the greater the second safety coefficient is, the higher the safety degree of the second material is when the second electrode serving as the battery cell works.
It should also be appreciated that the different first safety factors correspond to different first voltages; the second, different safety factor corresponds to a second, different voltage. Therefore, when the safety level of the battery cell is high, it means that a narrower charge-discharge cut-off voltage interval needs to be set for the first material and the second material, so as to ensure that the battery cell can work in a relatively stable state when the two materials are used as the positive electrode and the negative electrode of the battery cell. When the safety degree of the battery cell is low, it means that a wider charge-discharge cut-off voltage interval needs to be set for the first material and the second material, so that the battery cell can exert more battery capacity as much as possible.
Therefore, a specific constraint relation exists between the battery cell safety coefficient and the first safety coefficient and the second safety coefficient. For this constraint relationship, the present implementation is represented by the following expression:
C＝αC1+βC2
wherein C represents a battery cell safety factor, C 1 represents a first safety factor, α represents a weight of the first safety factor, C 2 represents a second safety factor, and β represents a weight of the second safety factor.
For the purpose, technical solutions and advantages of the embodiments of the present application, it is assumed that the first electrode is a positive electrode and the second electrode is a negative electrode. When a developer develops a material as the positive electrode of the cell and a material as the negative electrode of the cell, it is necessary to specify a matched charge-discharge cutoff voltage for the scenario in which the cell is used.
For the charge cut-off voltage, if the use scene of the battery core has a high requirement on the safety of the battery core, a larger value, for example, c=0.5, can be selected from the value range of 0 to 1 for C in the expression; conversely, smaller values may be taken from them. Then, if the safety of the material of the positive electrode is low and the material cannot bear a larger charging voltage, C 1 in the expression can be selected to have a larger value from the value range of 0 to 1, for example, C 1 =0.9; conversely, smaller values may be taken from them. Since the weights α and β in the expression are both preset values (for example, α=0.5, β=0.5), C 2 can be calculated, where the value range of C 2 is also in the value range of 0 to 1. That is, C, α, β, and C 1 in the above expression are specified according to the requirements by the usage scenario of the battery cell and the characteristics of the material itself; c 2 is calculated based on the specified parameters.
For the discharge cut-off voltage, the implementation process is similar to that of the charge cut-off voltage, and the description of the embodiment is omitted.
Based on the above description regarding the cell safety factor, the first safety factor, and the second safety factor, with continued reference to fig. 1, the method further includes:
s103, determining a first voltage when the first material is used as the first electrode according to the first safety coefficient.
The first safety coefficient and the first voltage have a first safety relationship, and the first safety relationship characterizes the change trend of the safety degree of the first material along with the open-circuit voltage during charging.
The first safety relationship includes a correspondence relationship between a plurality of first coefficients and a plurality of first open-circuit voltages, so that the analysis device can determine the first safety coefficient from the plurality of first coefficients according to the material safety characteristics of the first material, thereby taking the open-circuit voltage corresponding to the first safety coefficient as the first voltage.
It is worth noting here that the first security relationship is obtained by testing the first material. In a specific embodiment, the analysis device acquires a first state sequence acquired during charging of a first half-cell made of a first material, the first state sequence comprising a plurality of pairs of charging-related information, each pair of charging-related information comprising a first open-circuit voltage corresponding to a specific capacity of the first half-cell; the open circuit voltage of the two poles of the first half battery is gradually increased along with the continuous increase of the charging time.
The analysis device then determines pairs of target charging correlation information from the sequence segments located at the end of the first state sequence.
Finally, the analysis device establishes a correspondence between a first open-circuit voltage in the plurality of pairs of target charging-related information and a plurality of first coefficients, wherein the values of the plurality of first coefficients are inversely related to the values of the first open-circuit voltage in the plurality of pairs of target charging-related information.
Illustratively, it is assumed that the first electrode is the positive electrode and the first material is prepared by mixing lithium nickel cobalt manganate, PVDF (polyvinylidene fluoride), SP (conductive carbon black), CNTs (carbon nanotubes) according to 95:4:0.5: adding NMP in a proportion of 0.5, mixing and stirring to prepare positive electrode active slurry; then, the metal lithium sheet is coated on an aluminum foil, rolled, punched and the like, and the metal lithium sheet and the aluminum foil are assembled into the button positive half-cell.
And carrying out a charging test on the positive half-cell, and collecting a first state sequence of the positive half-cell in the charging process, namely establishing a corresponding relation between the specific capacity and the open-circuit voltage in charging. In order to ensure the safety of the positive half-cell during charging, the charging is stopped when the voltage boosting rate is more than or equal to 30mV/mAh.g -1 and the total specific charging capacity is more than or equal to 150 mAh/g.
For convenience of explanation, the first state sequence of the first material is shown in the form of a graph, and the effect thereof is shown in fig. 2. Since this embodiment focuses only on the charge cutoff voltage of the positive half-cell, which is related to the state when the capacity of the positive half-cell is about to be full, this embodiment only needs to intercept the last sequence segment from the first sequence.
As an alternative to the clipping, continuing with fig. 2, the "specific capacity-open circuit voltage" curve shown in fig. 2 is divided by 10 equally by the sitting axis where the specific capacity is located, and the dividing effect shown in fig. 2 indicates that the first sequence is divided into 10 sequence segments.
Then, the last curve in fig. 2 is further divided by 10 equally, so as to obtain the dividing effect shown in fig. 3, and the dividing effect shown in fig. 3 indicates that the last sequence segment in the 10 sequence segments is divided into 10 sub-segments.
And finally, as at least one pair of charging association information is included in each sub-segment, the last pair of charging association information in each sub-segment is used as target charging association information, and a corresponding relation between a plurality of first coefficients and open circuit voltages in the target charging association information is established. That is, the 10 dividing lines of the last curve in fig. 3 correspond to 10 first coefficients, and the 10 first coefficients correspond to 10 open circuit voltages on the coordinate axis where the open circuit voltages are located.
As further shown in fig. 3, the first plurality of coefficients is set to 1.0, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1. Wherein 1.0 corresponds to an open circuit voltage in the first target charging correlation information, the open circuit voltage being minimum; and 0.1 corresponds to the open circuit voltage in the last target charge related information, which is the largest. Therefore, the values of the first coefficients and the voltages of the open-circuit voltages are inversely related, namely, the larger the first coefficient is, the smaller the corresponding open-circuit voltage is, and the higher the safety of the positive electrode material during operation is; conversely, the less safe the positive electrode material is in operation.
It should be noted that the above description of the first security relationship is merely for the convenience of understanding the illustrated example, and the technician may perform other number of equal divisions on the curve in the first state sequence corresponding chart when implementing the present embodiment. Of course, charging related information at other positions in each sub-segment may be selected as target charging related information, or a plurality of charging related information may be selected from the last sequence segment according to a certain screening rule as a plurality of target charging related information, which is not limited in this embodiment. In addition, it should be noted that the above sequence relationship expressed by the "first", "last pair", and "last" is determined in order from small to large based on the timing at which the charging-related information is acquired.
After the correspondence between the first coefficients and the first open-circuit voltages of the positive electrode material is established, the first open-circuit voltage corresponding to the first safety coefficient can be determined as the first voltage according to the first coefficients. It should be understood that the first voltage is the absolute voltage of the positive electrode (physical meaning is for lithium potential), and the charge cut-off voltage of the target cell is obtained after comparing with the open circuit voltage at the time of discharging the negative electrode.
Based on the above description of the relationship between the first safety factor and the first voltage, continuing as shown in fig. 1, the method further comprises:
s104, determining a second voltage when the second material is used as the second electrode according to the second safety coefficient.
The second safety coefficient and the second voltage have a second safety relationship, and the second safety relationship represents the change trend of the safety degree of the second material along with the open-circuit voltage during discharge.
The second safety relationship includes a correspondence between a plurality of second coefficients and a plurality of discharge voltages, and therefore, the analysis apparatus determines a second safety coefficient from the plurality of second coefficients according to a material safety characteristic of the second material, and uses a second open-circuit voltage corresponding to the second safety coefficient as the second voltage.
Similar to the first material as the first electrode, the analysis device acquires a second state sequence acquired during discharge based on a second half-cell made of a second material, the second state sequence including pairs of discharge-related information, each pair of discharge-related information including a second open-circuit voltage corresponding to a specific capacity of the second half-cell.
Then, the analysis device determines pairs of target discharge-related information from the second sequence segment located at the end of the second state sequence;
Finally, the analysis device establishes a corresponding relation between a second open-circuit voltage in the plurality of pairs of target discharge related information and a plurality of second coefficients, wherein the values of the plurality of second coefficients are positively correlated with the magnitudes of the second open-circuit voltages in the plurality of pairs of target discharge related information.
Illustratively, since the first electrode serves as the positive electrode in the above example regarding the first electrode, the second electrode serves as the negative electrode in the present example, the second material is prepared by mixing silicon carbon, PAA (polyacrylic acid), CMC (sodium carboxymethyl cellulose), SBR (styrene butadiene rubber), SP (conductive carbon black), CNTs (carbon nanotubes) according to 94:1.2:1:2:1.3: adding deionized water in a proportion of 0.5, mixing and stirring to prepare anode active slurry, coating the anode active slurry on a copper foil, rolling, punching and the like, and assembling the anode active slurry and a metal lithium sheet into the button anode half battery.
And carrying out discharge test on the cathode half battery, and collecting a first state sequence of the cathode half battery in the discharge process, namely establishing a corresponding relation between specific capacity and open-circuit voltage in discharge.
For convenience of explanation, the second state sequence of the second material is shown in the form of a graph, and the effect thereof is shown in fig. 4. Since this embodiment focuses only on the discharge cutoff voltage of the negative half-cell, which is related to the state when the capacity of the negative half-cell is about to be exhausted, this embodiment only needs to intercept the last sequence segment from the first sequence.
As an alternative to the clipping, continuing with fig. 4, the "specific capacity-open circuit voltage" curve shown in fig. 4 is divided by 10 equally by the sitting axis where the specific capacity is located, and the dividing effect shown in fig. 4 indicates that the second sequence is divided into 10 sequence segments.
Then, the last curve in fig. 4 is further divided by 10 equally, so as to obtain the dividing effect shown in fig. 5, and the dividing effect shown in fig. 5 indicates that the last sequence segment in the 10 sequence segments is divided into 10 sub segments.
And finally, as at least one pair of discharge association information is included in each sub-segment, the last pair of discharge association information in each sub-segment is used as target discharge association information, and a corresponding relation between a plurality of second coefficients and a second open circuit voltage in the target discharge association information is established. I.e. the 10 dividing lines of the last curve in fig. 5 correspond to 10 second coefficients, and the 10 second coefficients correspond to 10 second open circuit voltages on the second open circuit voltage axis.
As further shown in fig. 5, the plurality of second coefficients are set to 1.0, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1. Wherein 1.0 corresponds to a second open-circuit voltage in the first target discharge-related information, the second open-circuit voltage being the largest; and 0.1 corresponds to a second open circuit voltage in the last target discharge related information, which is the smallest. Therefore, positive correlation is formed between the second coefficients and the second open-circuit voltages, that is, the larger the second coefficient is, the larger the corresponding second open-circuit voltage is, and the higher the safety of the cathode material during operation is; conversely, the less safe the negative electrode material is in operation.
It should be noted that the above description of the second security relationship is merely for the convenience of understanding the illustrated example, and the technician may perform other number of equal divisions on the curve in the second state sequence corresponding chart when implementing the present embodiment. Of course, the discharge related information at other positions in each sub-segment may be selected as the target discharge related information, or a plurality of discharge related information may be selected from the last sequence segment according to a certain screening rule as a plurality of target discharge related information, which is not limited in this embodiment. In addition, it should be noted that the above sequence relation expressed by the "first", "last pair", and "last" is determined in order from small to large based on the timing at which the discharge-related information is acquired.
After the correspondence between the plurality of second coefficients and the plurality of second open-circuit voltages of the anode material is established, the second safety coefficient can be determined according to the plurality of second coefficients, and the second open-circuit voltage corresponding to the second safety coefficient is used as the second voltage. It should be understood that the second voltage is an absolute voltage of the negative electrode, and the charging cut-off voltage of the target cell needs to be obtained after the comparison with the open circuit voltage during charging of the positive electrode.
Based on the above description of the relationship between the second safety factor and the second voltage, the method further comprises, as shown in fig. 1:
S105, obtaining the charge-discharge cut-off voltage of the target battery cell according to the first voltage and the second voltage.
As described in the above embodiment, the first voltage and the second voltage are both absolute voltages, and therefore, the absolute value of the difference between the two is taken as the cutoff voltage of the target cell.
Continuing with the curves shown in fig. 2-5 as an example, if α=0.5, β=0.5, and c=0.5 in c=αc 1+βC2, the expression becomes 1=c 1+C2.
If the selected positive electrode material has poor overcharge resistance, the first safety coefficient of the positive electrode material may be C 1 =0.9, and the second safety coefficient of the negative electrode material may be C 2 =0.1, where the first voltage at C 1 =0.9 in fig. 3 is 4.18V, and the second voltage at C 2 =0.1 in fig. 5 is 0V, and the charge cutoff voltage of the target cell is 4.18-0=4.18V.
For another example, if the positive electrode material is selected to have a good overcharge resistance, the first safety factor of the positive electrode material may be C 1 =0.2, the second safety factor of the negative electrode material may be C 2 =0.8, and in this case, the first voltage at C 1 =0.2 in fig. 3 is 4.27V, and the second voltage at C 2 =0.8 in fig. 5 is 0.03V, so that the charge cutoff voltage of the target cell is 4.27 to 0.03=4.24V.
The above only gives an example of obtaining the target cell charge cutoff voltage, and if the first electrode is a negative electrode and the second electrode is a positive electrode, the discharge cutoff voltage of the target cell can be obtained according to the above embodiment. For example, if the discharge cut-off voltage of the battery cell under the anode and cathode materials corresponding to fig. 2-5 is to be obtained, the corresponding first sequence may be obtained by performing the charge test on the anode half-cell, the corresponding second sequence may be obtained by performing the discharge test on the cathode half-cell, and the discharge cut-off voltage of the anode may be obtained according to the above embodiment, so that the description of this embodiment is omitted.
In order to ensure the safety of the positive half-cell and the negative half-cell, the discharge cut-off voltage of the positive half-cell is judged at a step-down rate, and when the step-down rate of the voltage is more than or equal to 180mV/mAh.g -1 and the total discharge specific capacity is more than or equal to 150mAh/g, the discharge is stopped.
And for the negative half battery, the charge cut-off voltage is judged according to the boost rate, and when the boost rate of the voltage is more than or equal to 29mV/mAh.g -1 and the total specific charge capacity is more than or equal to 300mAh/g, the charging is stopped.
In summary, in the above embodiment of the method for determining a cut-off voltage of charge and discharge of a battery cell, the analysis device obtains the second safety coefficient of the second material according to the preset battery cell safety coefficient of the target battery cell and the constraint relationship between the first safety coefficient of the first material and the second safety coefficient of the second material; determining the first voltage and the second voltage of each of the two materials according to the two safety coefficients respectively; finally, according to the first voltage and the second voltage, the charge/discharge cut-off voltage of the target battery cell is obtained. The first safety coefficient and the first voltage have a first safety relationship which characterizes the change trend of the safety degree of the first material along with the open-circuit voltage during charging; the second safety coefficient and the second voltage have a second safety relationship which characterizes the change trend of the safety degree of the second material along with the open-circuit voltage during discharge, and the two safety coefficients and the battery cell safety coefficient respectively meet the positively-related constraint condition; therefore, if the two materials are used as the battery cell electrode, the cut-off voltage required to be provided by the target battery cell can be determined according to the constraint conditions, so that the battery cell reaches the corresponding battery cell safety coefficient.
Based on the same inventive concept as the method for determining the cut-off voltage of the battery cell, the embodiment also provides a device for determining the cut-off voltage of the battery cell, which is applied to analysis equipment. The cell charge-discharge cut-off voltage determining means comprises at least one software functional module which may be stored in the memory 201 in the form of software or solidified in an Operating System (OS) of the analysis device. The processor 202 in the analysis device is arranged to execute executable modules stored in the memory 201. For example, a software function module included in the cell charge/discharge cutoff voltage determination device, a computer program, and the like. Referring to fig. 6, functionally divided, the cell charge/discharge cutoff voltage determining device may include:
The safety factor module 101 is configured to obtain a preset battery cell safety factor of a target battery cell and a first safety factor of a first material, where the first material is used as a first electrode of the target battery cell;
the safety coefficient module 101 is further configured to obtain a second safety coefficient of the second material according to the cell safety coefficient and a constraint relationship between the first safety coefficient and the second safety coefficient of the second material; the second material is used as a second electrode of the target battery cell, and the first safety coefficient and the second safety coefficient are respectively in positive correlation with the battery cell safety coefficient.
In the present embodiment, the security coefficient module 101 is used to implement steps S101-S102 in fig. 1, and for a detailed description of the security coefficient module 101, reference may be made to the description of steps S101-S102.
A voltage calculation module 102 for determining a first voltage when the first material is the first electrode according to the first safety factor; the first safety coefficient and the first voltage have a first safety relationship, and the first safety relationship represents the change trend of the safety degree of the first material along with the open-circuit voltage during charging;
The voltage calculation module 102 is further configured to determine a second voltage when the second material is used as the second electrode according to a second safety factor; the second safety coefficient and the second voltage have a second safety relationship, and the second safety relationship represents the change trend of the safety degree of the second material along with the open-circuit voltage during discharge;
the voltage calculation module 102 is further configured to obtain a cut-off voltage of the target cell according to the first voltage and the second voltage.
In the present embodiment, the voltage calculation module 102 is used to implement steps S103-S105 in fig. 1, and a detailed description of the voltage calculation module 102 can be found in the description of steps S103-S105.
It should be noted that, since the device for determining a cutoff voltage of charge and discharge of a battery cell and the method for determining a cutoff voltage of charge and discharge of a battery cell have the same inventive concept, the above safety factor module 101 and the voltage calculation module 102 can also be used for implementing other steps and sub-steps of the method for determining a cutoff voltage of charge and discharge of a battery cell.
In addition, functional modules in the embodiments of the present application may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part.
It should also be appreciated that the above embodiments, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored on a computer readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application.
Accordingly, the present embodiment also provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the method for determining a cutoff voltage of charge and discharge of a battery cell provided in the present embodiment. The computer readable storage medium may be any of various media capable of storing program codes, such as a usb (universal serial bus), a removable hard disk, a read-only memory (ROM), a random access memory (RAM, random Access Memory), a magnetic disk, or an optical disk.
The present embodiment also provides an analysis apparatus, as shown in fig. 7, which may include a processor 202 and a memory 201. The processor 202 and the memory 201 may communicate via a system bus. The memory 201 stores a computer program, and the processor reads and executes the computer program corresponding to the above embodiment in the memory 201 to realize the method for determining the battery cell charge/discharge cutoff voltage provided in the present embodiment.
With continued reference to fig. 7, the analysis device may further include a communication unit, where the memory 201, the processor 202, and the communication unit 203 are electrically connected directly or indirectly to each other to implement data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines.
The memory 201 may be an information recording device based on any electronic, magnetic, optical or other physical principle for recording execution instructions, data, etc. In some embodiments, the memory 201 may be, but is not limited to, volatile memory, non-volatile memory, storage drives, and the like.
The volatile memory may be, for example only, random access memory (Random Access Memory, RAM). The nonvolatile memory may be Read Only Memory (ROM), programmable read only memory (Programmable Read-only memory, PROM), erasable read only memory (Erasable Programmable Read-only memory, EPROM), electrically erasable read only memory (Electric Erasable Programmable Read-only memory, EEPROM), flash memory, or the like; the storage drive may be a magnetic disk drive, a solid state disk, any type of storage disk (e.g., optical disk, DVD, etc.), or a similar storage medium, or a combination thereof, etc.
The communication unit 203 is used for transmitting and receiving data through a network. In some embodiments, the network may include a wired network, a wireless network, a fiber optic network, a telecommunications network, an intranet, the internet, a local area network (Local Area Network, LAN), a wide area network (Wide Area Network, WAN), a wireless local area network (Wireless Local Area Networks, WLAN), a metropolitan area network (Metropolitan Area Network, MAN), a wide area network (Wide Area Network, WAN), a public switched telephone network (Public Switched Telephone Network, PSTN), a bluetooth network, a ZigBee network, a near field communication (NEAR FIELD communication, NFC) network, or the like, or any combination thereof. In some embodiments, the network may include one or more network access points. For example, the network may include wired or wireless network access points, such as base stations and/or network switching nodes, through which one or more components of the service request processing system may connect to the network to exchange data and/or information.
The processor 202 may be an integrated circuit chip with signal processing capabilities and may include one or more processing cores (e.g., a single-core processor or a multi-core processor). By way of example only, the processor may include a central processing unit (Central Processing Unit, CPU), application SPECIFIC INTEGRATED Circuit (ASIC), special purpose instruction set processor (Application Specific Instruction-set processor, ASIP), graphics processing unit (Graphics Processing Unit, GPU), physical processing unit (Physics Processing Unit, PPU), digital signal processor (DIGITAL SIGNAL processor, DSP), field programmable gate array (Field Programmable GATE ARRAY, FPGA), programmable logic device (Programmable Logic Device, PLD), controller, microcontroller unit, reduced instruction set computer (Reduced Instruction Set Computing, RISC), microprocessor, or the like, or any combination thereof.
It should be understood that the apparatus and method disclosed in the above embodiments may be implemented in other manners. The apparatus embodiments described above are merely illustrative, for example, of the flowcharts and block diagrams in the figures that illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The above description is merely illustrative of various embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the scope of the present application, and the application is intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (7)
1. A method for determining a cut-off voltage of a battery cell, the method comprising:
Acquiring a preset battery cell safety coefficient of a target battery cell and a first safety coefficient of a first material, wherein the first material is used as a first electrode of the target battery cell; the first safety coefficient is one of a plurality of first coefficients, and the corresponding relation between the first coefficients and the first open-circuit voltages is obtained through a charging test of a first half cell made of the first material;
Obtaining a second safety coefficient of the second material according to the battery cell safety coefficient and the constraint relation between the first safety coefficient and the second safety coefficient of the second material; the second material is used as a second electrode of the target battery cell, and the first safety coefficient and the second safety coefficient are respectively in positive correlation with the battery cell safety coefficient; the second safety coefficient is one of a plurality of second coefficients, and the corresponding relation between the second coefficients and the second open-circuit voltages is obtained through discharge test of a second half battery made of the second material;
taking the first open-circuit voltage corresponding to the first safety coefficient as a first voltage; taking the second open-circuit voltage corresponding to the second safety coefficient as a second voltage;
and taking the absolute value of the difference between the first voltage and the second voltage as the charge cut-off voltage or the discharge cut-off voltage of the target battery cell.
2. The method of determining a cell charge-discharge cutoff voltage according to claim 1, further comprising:
Acquiring a first state sequence acquired during charging of a first half-cell made of the first material, wherein the first state sequence comprises a plurality of pairs of charging related information, and each pair of charging related information comprises a first open-circuit voltage of the specific capacity of the first half-cell corresponding to the specific capacity;
Determining a plurality of pairs of target charging related information from sequence segments located at the tail of the first state sequence, wherein the sequence segments at the tail of the first state sequence represent the state of the first half battery when the first half battery is about to be fully charged;
and establishing a corresponding relation between the first open-circuit voltage in the plurality of pairs of target charging related information and the plurality of first coefficients, wherein the plurality of first coefficients are inversely related to the first open-circuit voltage in the plurality of pairs of target charging related information.
3. The method of determining a cell charge-discharge cutoff voltage according to claim 1, further comprising:
acquiring a second state sequence acquired during discharging of a second half battery made of the second material, wherein the second state sequence comprises a plurality of pairs of discharging related information, and each pair of discharging related information comprises a second open-circuit voltage corresponding to the specific capacity of the second half battery;
Determining a plurality of pairs of target discharge related information from a second sequence segment positioned at the tail of the second state sequence, wherein the second sequence segment at the tail of the second state sequence represents the state of the second half battery when the second half battery is about to be discharged;
And establishing a corresponding relation between a second open-circuit voltage in the pairs of target discharge related information and the second coefficients, wherein the second coefficients are positively correlated with the second open-circuit voltage in the pairs of target discharge related information.
4. The method for determining a cutoff voltage for charge and discharge of a battery cell according to claim 1, wherein the first safety factor, the second safety factor, and the battery cell safety factor satisfy the following constraint relation:
C＝αC1+βC2
Wherein C represents the battery cell safety coefficient, C 1 represents the first safety coefficient, α represents the weight of the first safety coefficient, C 2 represents the second safety coefficient, and β represents the weight of the second safety coefficient.
5. A device for determining a cut-off voltage of a battery cell, the device comprising:
The safety coefficient module is used for acquiring a preset battery cell safety coefficient of a target battery cell and a first safety coefficient of a first material, wherein the first material is used as a first electrode of the target battery cell, the first safety coefficient is one of a plurality of first coefficients, and the corresponding relation between the plurality of first coefficients and a plurality of first open-circuit voltages is obtained through a charging test of a first half battery made of the first material;
The safety coefficient module is further used for obtaining a second safety coefficient of the second material according to the battery cell safety coefficient and the constraint relation between the first safety coefficient and the second safety coefficient of the second material; the second material is used as a second electrode of the target battery cell, and the first safety coefficient and the second safety coefficient are respectively in positive correlation with the battery cell safety coefficient; the second safety coefficient is one of a plurality of second coefficients, and the corresponding relation between the second coefficients and the second open-circuit voltages is obtained through discharge test of a second half battery made of the second material;
The voltage calculation module is used for taking the first open-circuit voltage corresponding to the first safety coefficient as a first voltage; taking the second open-circuit voltage corresponding to the second safety coefficient as a second voltage;
The voltage calculation module is further configured to use an absolute value of a difference between the first voltage and the second voltage as a charge cutoff voltage or a discharge cutoff voltage of the target battery cell.
6. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program, which when executed by a processor, implements the method for determining a cell charge-discharge cut-off voltage according to any one of claims 1 to 4.
7. An analysis device comprising a processor and a memory, the memory storing a computer program which, when executed by the processor, implements the method of determining a cut-off voltage for a cell according to any one of claims 1 to 4.
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