CN115508723A - Battery cell charging and discharging cut-off voltage determination method and related device - Google Patents
Battery cell charging and discharging cut-off voltage determination method and related device Download PDFInfo
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
In the cell charge-discharge cutoff voltage determining method and the related device, the analysis equipment obtains a second safety coefficient of a second material according to a preset cell safety coefficient of a target cell and a first safety coefficient of a first material; and obtaining the cut-off voltage of the target battery cell according to the respective first voltage and second voltage of the two materials determined by the two safety factors. The first safety relation between the first safety factor and the first voltage represents the change trend of the safety degree of the first material along with the open-circuit voltage during charging; a second safety relation between the second safety coefficient and the second voltage represents a 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 cell safety coefficient meet a positive correlation constraint condition; therefore, if the two materials are used as the cell electrodes, the cut-off voltage required to be provided by the target cell can be determined according to the constraint conditions, so that the cell reaches the corresponding cell safety factor.
Description
Technical Field
The application relates to the field of batteries, in particular to a method for determining charge-discharge cut-off voltage of a battery core and a related device.
Background
Lithium ion batteries are widely applied to daily life at present, but different lithium ion batteries have different charge-discharge cut-off voltages and different discharge voltage-sharing voltages, and common lithium ion batteries in daily life, such as lithium iron phosphate batteries, have a charge-discharge voltage interval mainly ranging from 2V to 3.65V; the ternary lithium ion battery has a charge-discharge voltage interval of mainly 2.5V-4.3V.
The charge-discharge cut-off voltages of different types of lithium ion batteries are related to the composition of positive and negative electrode materials of the lithium batteries. For example, the cathode material is a ternary material, the anode 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 anode material.
However, with the continuous research on lithium ion battery materials, the conventional charge/discharge cut-off voltage cannot predict the safe charge/discharge cut-off voltage interval of the battery cell when the new positive and negative materials that may appear in the future are matched with each other to form the battery cell.
Disclosure of Invention
In order to overcome at least one of the defects in the prior art, the application provides a method and a related device for determining the charge-discharge cut-off voltage of a battery cell, which are used for determining the safe charge-discharge cut-off voltage of a battery made of a new material, so that the battery cell reaches the battery cell safety coefficient required to be met. The method specifically comprises the following steps:
in a first aspect, the present application provides a method for determining a charge/discharge cutoff voltage of a battery cell, which is applied to an analysis device, and the method includes:
acquiring a preset cell safety factor of a target cell and a first safety factor of a first material, wherein the first material is used as a first electrode of the target cell;
obtaining a second safety factor of a second material according to the constraint relation among the battery cell safety factor, the first safety factor and a second safety factor of the second material; wherein the second material is used as a second electrode of the target cell, and the first safety factor and the second safety factor are respectively in positive correlation with the cell safety factor;
determining a first voltage when the first material is used as the first electrode according to the first safety factor; wherein the first safety factor and the first voltage have a first safety relation, and the first safety relation represents the variation 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 used as the second electrode according to the second safety factor; the second safety factor and the second voltage have a second safety relation, and the second safety relation represents the change trend of the safety degree of the second material along with the open-circuit voltage during discharging;
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 battery cell charge and discharge cutoff voltage determination apparatus, including:
the safety factor module is used for acquiring a preset cell safety factor of a target cell and a first safety factor of a first material, wherein the first material is used as a first electrode of the target cell;
the safety coefficient module is further used for obtaining a second safety coefficient of a second material according to the constraint relation among the cell safety coefficient, the first safety coefficient and the second safety coefficient of the second material; wherein the second material is used as a second electrode of the target cell, and the first safety factor and the second safety factor are respectively in positive correlation with the cell safety factor;
the voltage calculation module is used for determining a first voltage when the first material is used as the first electrode according to the first safety factor; wherein the first safety factor and the first voltage have a first safety relation, and the first safety relation represents the variation trend of the safety degree of the first material along with the open-circuit voltage during charging;
the voltage calculation module is further configured to determine a second voltage when the second material is used as the second electrode according to the second safety factor; the second safety factor and the second voltage have a second safety relation, and the second safety relation represents the change trend of the safety degree of the second material along with the open-circuit voltage during discharging;
the voltage calculation module is further configured to obtain a cut-off voltage of the target electric core according to the first voltage and the second voltage.
In a third aspect, the present application provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the method for determining a charge/discharge cutoff voltage of a battery cell is implemented.
In a fourth aspect, the present application provides an analysis device, where the analysis device includes a processor and a memory, where the memory stores a computer program, and the computer program, when executed by the processor, implements the method for determining the cell charge/discharge cutoff voltage.
Compared with the prior art, the method has the following beneficial effects:
in the cell charge-discharge cutoff voltage determining method and the related device, the analysis equipment obtains a second safety coefficient of a second material according to a preset cell safety coefficient of a target cell and a first safety coefficient of a first material; determining respective first voltage and second voltage of the two materials according to the two safety factors; and finally, obtaining the cut-off voltage of the target battery cell according to the first voltage and the second voltage. The first safety relation between the first safety factor and the first voltage represents the change trend of the safety degree of the first material along with the open-circuit voltage during charging; a second safety relation between the second safety coefficient and the second voltage represents a 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 cell safety coefficient meet a positive correlation constraint condition; therefore, if the two materials are used as the cell electrodes, the cut-off voltage required to be provided by the target cell can be determined according to the constraint conditions, so that the cell reaches the corresponding cell safety factor.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic flow chart of a method provided by an embodiment of the present application;
fig. 2 is a schematic view illustrating a charge curve segmentation effect according to an embodiment of the present disclosure;
fig. 3 is a second schematic view illustrating a charging curve dividing effect according to an embodiment of the present application;
fig. 4 is a schematic view illustrating a discharge curve segmentation effect provided in an embodiment of the present application;
FIG. 5 is a second schematic view illustrating a discharge curve dividing effect provided by the embodiment of the present application;
FIG. 6 is a schematic diagram of an apparatus according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of an apparatus provided in an embodiment of the present application.
An icon: 101-a safety factor module; 102-a voltage calculation module; 201-a memory; 202-a processor; 203-communication unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
In the description of the present application, it is noted that the terms "first", "second", "third", and the like are used merely for distinguishing between descriptions and are not intended to indicate or imply 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 a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
Based on the above statement, it should be understood that, if the interval of the charge/discharge cutoff voltage of the battery cell is designed to be narrow, the full capacity of the battery cannot be exerted, and if the interval of the charge/discharge cutoff voltage is designed to be wide, the risk of overcharge or overdischarge may occur.
For example, in a lithium ion battery common in daily life, such as a lithium iron phosphate battery, the charging and discharging voltage interval is mainly 2V to 3.65V; the ternary lithium ion battery has a charge-discharge voltage interval of mainly 2.5V-4.3V. That is, for the lithium iron phosphate battery, the maximum voltage during charging is limited to 3.65V, and the minimum voltage during discharging is limited to 2V; and for the 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 anode and the cathode of the battery core. For example, the cathode material is a ternary material, the anode 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 anode material. With the continuous research on lithium ion battery materials, the conventional charge-discharge cutoff voltage cannot predict the safe charge-discharge cutoff voltage interval of the battery cell when the new positive and negative materials possibly appearing in the future are matched with each other to form the battery cell.
It should be noted that the above prior art solutions have shortcomings which are the results of practical and careful study of the inventor, therefore, the discovery process of the above problems and the solutions proposed by the embodiments of the present application in the following description should be the contribution of the inventor to the present application in the course of the invention creation process, and should not be understood as technical contents known by those skilled in the art.
Therefore, this embodiment provides a method for determining a charge/discharge cut-off voltage of a battery cell applied to an analysis device, so as to determine a safe charge/discharge cut-off voltage for a battery cell made of a new material, so that the battery cell reaches a battery cell safety coefficient that needs to be met. Wherein the analysis device may be a user terminal, e.g. a mobile terminal, a tablet computer, a laptop computer, a desktop computer, etc. The mobile terminal may include a smart phone, a Personal Digital Assistant (PDA), and the like.
Based on the above description, the steps of the method are described in detail below with reference to fig. 1.
As shown in fig. 1, the method includes:
s101, cell safety factors preset by a target cell and first safety factors of a first material are obtained.
And S102, obtaining a second safety factor of the second material according to the constraint relation among the cell safety factor, the first safety factor and the second safety factor of the second material.
Wherein the first material is for a first electrode that is a target cell; the second material is used as a second electrode of the target battery cell, and the first safety factor and the second safety factor are respectively in positive correlation with the battery cell safety factor.
It should be understood here that the battery cell includes a positive electrode and a negative electrode, and when the first electrode in this embodiment is the positive electrode, the second electrode is the negative electrode, and the calculated cut-off voltage is the charge cut-off voltage of the battery cell; and 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 cell safety factor is used for representing the safety degree of the cell, and the higher the cell safety factor is, the higher the safety degree of the cell is; the first safety factor is used for representing the safety degree of the first material, and if the first safety factor is large, the safety degree of the first material serving as the first electrode of the battery cell during working is higher; the second safety factor is used for representing the safety degree of the second material, and the larger the second safety factor is, the higher the safety degree of the second material serving as the second electrode of the battery cell during working is.
It should also be appreciated that different first safety factors correspond to different first voltages; the different second safety factors correspond to different second voltages. Therefore, when the safety degree 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 to ensure that the battery cell can operate 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 relationship exists among the cell safety factor, the first safety factor and the second safety factor. For this constraint relationship, the present implementation is represented by the following expression:
C＝αC 1 +βC 2
wherein C represents the cell safety factor, C 1 Representing a first safety factor, alpha representing a weight of the first safety factor, C 2 Representing a second safety factor and beta represents a weight of the second safety factor.
To make the objects, technical solutions and advantages of the embodiments of the present application clearer, it is assumed that the first electrode is a positive electrode and the second electrode is a negative electrode. After research and development personnel research and develop a material as the positive electrode of the battery cell and a material as the negative electrode of the battery cell, the matched charge-discharge cut-off voltage needs to be specified for the scene used by the battery cell.
For the charge cut-off voltage, if the usage scenario of the battery cell has a high requirement on the safety of the battery cell, C in the expression may be selected from a value range of 0 to 1 to have a larger value, for example, C =0.5; conversely, smaller values may be taken from them. Then, if the material of the positive electrode itself is low in safety and cannot withstand a large charging voltage, C in the expression may be used 1 Selecting a larger value from the range of 0-1, e.g. 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 (e.g., α =0.5, β = 0.5), C can be calculated 2 Wherein, C 2 The value range of (a) is also in the value range of 0 to 1. That is, C, α, β and C in the above expression 1 The battery cell is specified according to requirements by using scenes of the battery cell and the characteristics of the material; c 2 It is calculated based on the specified parameters.
For the discharging cut-off voltage, the implementation process is similar to the charging cut-off voltage, and the description of this embodiment is omitted.
Based on the above related descriptions regarding the cell safety factor, the first safety factor, and the second safety factor, with continued reference to fig. 1, the method further includes:
and S103, determining a first voltage when the first material is used as the first electrode according to the first safety factor.
The first safety factor and the first voltage have a first safety relation, and the first safety relation represents the change trend of the safety degree of the first material along with the open-circuit voltage during charging.
This first safety relation includes the corresponding relation between a plurality of first coefficients and a plurality of first open circuit voltage, therefore, this analytical equipment can be according to the material safety characteristic of first material, determines first factor of safety from a plurality of first coefficients to with the open circuit voltage that first factor of safety corresponds, as first voltage.
It is worth mentioning here that the first safety 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 including a plurality of pairs of charging correlation information, each pair of charging correlation information including a specific capacity of the first half-cell and a first open-circuit voltage corresponding to the specific capacity; wherein, 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.
Then, the analysis device determines a plurality of pairs of target charging-related information from the sequence segment located at the end of the first state sequence.
Finally, the analysis device establishes a correspondence between the first open-circuit voltage in the plurality of pairs of target charging-related information and a plurality of first coefficients, wherein values of the plurality of first coefficients are inversely correlated with values of the first open-circuit voltage in the plurality of pairs of target charging-related information.
Exemplarily, it is assumed that the first electrode is a positive electrode, and the first material is prepared by mixing lithium nickel cobalt manganese oxide, PVDF (polyvinylidene fluoride), SP (conductive carbon black), CNTs (carbon nanotubes) in a ratio of 95:4:0.5: adding NMP in a proportion of 0.5, mixing and stirring to prepare positive active slurry; and then coating the aluminum foil with the lithium alloy, rolling, punching and the like, and assembling the aluminum foil and the lithium metal sheet into a button positive electrode half cell.
And carrying out a charging test on the positive half-cell, and acquiring 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 during charging. Wherein, in order to ensure the positive electrode half during chargingThe safety of the battery is ensured, and when the voltage boosting rate is more than or equal to 30mV/mAh -1 And stopping charging when the total charging specific capacity is more than or equal to 150 mAh/g.
For convenience of explanation, the effect of the first sequence of states of the first material is shown in the form of a graph in fig. 2. Since the present embodiment only focuses on the charge cut-off voltage of the positive half-cell, which in turn is related to the state of the positive half-cell when its capacity is about to be fully charged, the present embodiment only needs to truncate the last sequence segment from the first sequence.
As an alternative way of truncation, continuing with fig. 2, the "specific capacity-open circuit voltage" curve shown in fig. 2 is divided by 10 equal divisions along the axis of the specific capacity, and the segmentation effect shown in fig. 2 represents the segmentation of the first sequence into 10 sequence segments.
Then, the last curve in fig. 2 is further divided by 10 equal parts to obtain the dividing effect shown in fig. 3, and the dividing effect shown in fig. 3 means that the last sequence segment of the 10 sequence segments is divided into 10 sub-segments.
Finally, because each sub-segment includes at least one pair of charging correlation information, the last pair of charging correlation information in each sub-segment is used as the target charging correlation information, and the corresponding relationship between the plurality of first coefficients and the open-circuit voltage in the plurality of target charging correlation information is established. That is, 10 dividing lines of the last section of the curve in fig. 3 correspond to 10 first coefficients, and 10 first coefficients correspond to 10 open-circuit voltages on the coordinate axis of the open-circuit voltage.
Continuing with FIG. 3, a plurality of first 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 the open circuit voltage in the first target charging related information, and the open circuit voltage is the minimum; and 0.1 corresponds to the maximum open circuit voltage in the last target charging related information. Therefore, the numerical values of the first coefficients and the voltages of the open-circuit voltages are in inverse correlation, that is, 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 at the moment; conversely, the less safe the positive electrode material is in operation.
It should be noted that the above description of the first safety relationship is only for the convenience of understanding the listed examples, and the skilled person may perform other number of equally dividing processes on the curve in the first state sequence corresponding diagram when implementing the present embodiment. Of course, the charging related information at other positions in each sub-segment may also be selected as the target charging related information, or a plurality of charging related information may be selected from the last sequence segment as a plurality of target charging related information according to a certain filtering rule, which is not specifically limited in this embodiment. In addition, it should be noted that the order relationship expressed by the above "first", "last pair", and "last" is determined in order from small to large based on the time when the charging-related information is collected.
Therefore, after the corresponding relation between the plurality of first coefficients of the cathode material and the plurality of first open-circuit voltages is established, the first open-circuit voltage corresponding to the first safety factor can be determined according to the plurality of first coefficients to serve as the first voltage. It should be understood here that the first voltage is an absolute voltage (physically meaning to lithium potential) of the positive electrode, and needs to be compared with an open circuit voltage at the time of discharging of the negative electrode to obtain a charge cut-off voltage of the target cell.
Based on the above description regarding the relationship between the first safety factor and the first voltage, continuing as shown in fig. 1, the method further comprises:
and S104, determining a second voltage when the second material is used as the second electrode according to the second safety factor.
And the second safety factor and the second voltage have a second safety relation, and the second safety relation represents the change trend of the safety degree of the second material along with the open-circuit voltage during discharging.
The second safety relationship includes a correspondence between a plurality of second coefficients and a plurality of discharge voltages, and therefore the analysis device determines a second safety factor from the plurality of second coefficients according to the material safety characteristics of the second material, and takes a second open-circuit voltage corresponding to the second safety factor as the second voltage.
Similar to the first material as the first electrode, the analysis device acquires a second state sequence acquired during discharge of a second half-cell made of a second material, the second state sequence including a plurality of 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 a plurality of pairs of target discharge related information from a second sequence segment located at the end of the second state sequence;
finally, the analysis device establishes a correspondence relationship between the second open-circuit voltage in the plurality of pairs of target discharge-related information and a plurality of second coefficients, wherein the numerical values of the plurality of second coefficients are positively correlated with the magnitude of the second open-circuit voltage in the plurality of pairs of target discharge-related information.
Exemplarily, since the first electrode is used as a positive electrode in the above example regarding the first electrode, the second electrode is used as a negative electrode in this example, and the second material is obtained by mixing silicon carbon, PAA (polyacrylic acid), CMC (sodium carboxymethyl cellulose), SBR (styrene butadiene rubber), SP (conductive carbon black), CNTs (carbon nanotubes) in 94:1.2:1:2:1.3: deionized water is added in a proportion of 0.5 for mixing and stirring to prepare negative active slurry, the negative active slurry is coated on copper foil, and the copper active slurry and a metal lithium sheet are assembled into a button negative half cell after the treatment of rolling, punching and the like.
And carrying out discharge test on the negative half-cell, and acquiring a first state sequence of the negative half-cell in the discharge process, namely establishing a corresponding relation between the specific capacity and the open-circuit voltage during discharge.
For ease of explanation herein, the effect of the second sequence of states of the second material is shown graphically in fig. 4. Since the present embodiment only focuses on the discharge cut-off voltage of the negative half-cell, which in turn is related to the state when the capacity of the negative half-cell is about to be exhausted, the present embodiment only needs to truncate the last sequence segment from the first sequence.
As an alternative way of truncation, continuing with fig. 4, the "specific capacity-open circuit voltage" curve shown in fig. 4 is divided by 10 equal divisions along the axis of the specific capacity, and the segmentation effect shown in fig. 4 represents the segmentation of the second sequence into 10 sequence segments.
Then, the last curve in fig. 4 is further divided by 10 equal parts to obtain the dividing effect shown in fig. 5, and the dividing effect shown in fig. 5 means that the last sequence segment in the 10 sequence segments is divided into 10 sub-segments.
Finally, since each sub-segment includes at least one pair of discharge related information, the last pair of discharge related information in each sub-segment is used as the target discharge related information, and a corresponding relationship between a plurality of second coefficients and a second open-circuit voltage in the plurality of target discharge related information is established. That is, 10 dividing lines of the last curve in fig. 5 correspond to 10 second coefficients, and 10 second coefficients correspond to 10 second open-circuit voltages on the second open-circuit voltage axis.
Continuing with FIG. 5, a 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, and the second open-circuit voltage is the maximum; and 0.1 corresponds to the second open circuit voltage in the last target discharge-related information, which is the minimum. Therefore, the plurality of second coefficients and the plurality of second open-circuit voltages are in positive correlation, that is, the larger the second coefficient is, the larger the corresponding second open-circuit voltage is, and the higher the safety of the negative electrode material during operation is at this time; conversely, the less safe the negative electrode material is in operation.
It should be noted that the above description of the second safety relationship is only for the convenience of understanding the listed examples, and the skilled person may perform other number of equally dividing processes on the curve in the second state sequence corresponding diagram when implementing the present embodiment. Of course, the discharge related information at other positions in each sub-segment may also be selected as the target discharge related information, or a plurality of discharge related information may be selected as a plurality of target discharge related information from the last sequence segment according to a certain filtering rule, which is not specifically limited in this embodiment. In addition, it should be noted that the order relationship expressed by the above "first", "last pair", and "last" is determined in order from small to large based on the time when the discharge-related information is collected.
Therefore, after the corresponding relation between the plurality of second coefficients of the cathode material and the plurality of second open-circuit voltages is established, a 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 here that the second voltage is an absolute voltage of the negative electrode, and needs to be compared with an open circuit voltage of the positive electrode during charging to obtain a charge cut-off voltage of the target cell.
Based on the above description about the relationship between the second safety factor and the second voltage, as shown in fig. 1, the method further includes:
and S105, obtaining the charge and discharge cutoff 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 example of the curves shown in fig. 2-5, if C = α C 1 +βC 2 α =0.5, β =0.5, c =0.5, the expression becomes 1=C 1 +C 2 。
If the selected positive electrode material has poor overcharge resistance, the first safety factor of the positive electrode material may be set as C 1 =0.9, and the second safety factor of the negative electrode material is set to C 2 =0.1, at this time, C in fig. 3 1 The first voltage at =0.9 is 4.18V, C in fig. 5 2 If the second voltage at time point of =0.1 is 0V, the charge cut-off voltage of the target cell is 4.18-0=4.18v.
For example, if the selected positive electrode material has a high overcharge resistance, the first safety factor of the positive electrode material may be C 1 =0.2, and the second safety factor of the negative electrode material is set to C 2 =0.8, at this time, C in fig. 3 1 The first voltage when =0.2 is 4.27V, C in fig. 5 2 If the second voltage is 0.03V when =0.8, the charge cut-off 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 cut-off voltage, and if the first electrode is a negative electrode and the second electrode is a positive electrode, the discharge cut-off voltage of the target cell can be obtained according to the above embodiment. For example, if the discharge cut-off voltages of the cells under the positive and negative electrode materials corresponding to fig. 2 to fig. 5 are to be obtained, the charging test may be performed on the negative electrode half battery to obtain a corresponding first sequence, the discharging test may be performed on the positive electrode half battery to obtain a corresponding second sequence, and the discharge cut-off voltage of the negative electrode may be obtained according to the foregoing embodiment, and therefore, details of this embodiment are not repeated.
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 voltage reduction rate, and when the voltage reduction rate is more than or equal to 180mV/mAh.g -1 And stopping discharging when the total specific discharge capacity is more than or equal to 150 mAh/g.
And for the negative half cell, judging the charge cut-off voltage at a boosting rate, and when the boosting rate of the voltage is more than or equal to 29mV/mAh -1 And stopping charging when the total charging specific capacity is more than or equal to 300 mAh/g.
In summary, in the above embodiments of the method for determining the charge/discharge cutoff voltage of the battery cell, the analysis device obtains the second safety factor of the second material according to the preset battery cell safety factor of the target battery cell and the constraint relationship between the first safety factor of the first material and the second safety factor of the second material; determining respective first voltage and second voltage of the two materials according to the two safety factors; finally, the charge/discharge cutoff voltage of the target cell is obtained according to the first voltage and the second voltage. The first safety relation between the first safety factor and the first voltage represents the change trend of the safety degree of the first material along with the open-circuit voltage during charging; a second safety relation between a second safety coefficient and a second voltage represents a change trend of the safety degree of the second material along with the open-circuit voltage during discharging, and the two safety coefficients respectively satisfy a positive correlation constraint condition with the cell safety coefficient; therefore, if the two materials are used as the cell electrodes, the cut-off voltage required to be provided by the target cell can be determined according to the constraint conditions, so that the cell reaches the corresponding cell safety factor.
Based on the same inventive concept as the method for determining the charge/discharge cut-off voltage of the battery cell, the embodiment further provides a device for determining the charge/discharge cut-off voltage of the battery cell, which is applied to analysis equipment. The battery cell charging/discharging cutoff voltage determining apparatus includes at least one software functional module which can be stored in the memory 201 in a software form or solidified in an Operating System (OS) of the analysis device. The processor 202 in the analysis device is used to execute the executable modules stored in the memory 201. For example, the battery cell charge/discharge cutoff voltage determination device includes a software function module, a computer program, and the like. Referring to fig. 6, functionally, the cell charge/discharge cutoff voltage determining apparatus may include:
the safety factor module 101 is configured to obtain a preset cell safety factor of a target cell and a first safety factor of a first material, where the first material is used as a first electrode of the target cell;
the safety coefficient module 101 is further configured to obtain a second safety coefficient of the second material according to the constraint relationship among the cell safety coefficient, 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 cell, and the first safety factor and the second safety factor are respectively in positive correlation with the cell safety factor.
In the present embodiment, the safety factor module 101 is used to implement steps S101-S102 in fig. 1, and for a detailed description of the safety factor module 101, reference may be made to the descriptions of steps S101-S102.
The voltage calculation module 102 is used for determining a first voltage when the first material is used as the first electrode according to a first safety factor; the first safety factor and the first voltage have a first safety relation, and the first safety relation 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 serves as the second electrode according to a second safety factor; the second safety factor and the second voltage have a second safety relation, and the second safety relation represents the change trend of the safety degree of the second material along with the open-circuit voltage during discharging;
the voltage calculation module 102 is further configured to obtain a cut-off voltage of the target battery cell according to the first voltage and the second voltage.
In the present embodiment, the voltage calculating module 102 is used to implement steps S103 to S105 in fig. 1, and for a detailed description of the voltage calculating module 102, reference may be made to the description of steps S103 to S105.
It should be noted that, since the cell charge/discharge cutoff voltage determination apparatus and the cell charge/discharge cutoff voltage determination method have the same inventive concept, the above safety factor module 101 and the voltage calculation module 102 may also be used to implement other steps and substeps of the cell charge/discharge cutoff voltage determination method.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
It should also be understood 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 in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application.
Therefore, the present embodiment further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the method for determining the charge/discharge cutoff voltage of the battery cell according to the present embodiment is implemented. The computer-readable storage medium may be a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, which can store program codes.
The present embodiment further provides an analysis apparatus, as shown in fig. 7, the analysis apparatus may include a processor 202 and a memory 201. The processor 202 and 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, so as to implement the method for determining the charge/discharge cutoff voltage of the battery cell provided in the present embodiment.
With continued reference to fig. 7, the analysis device may further comprise a communication unit, the elements of the memory 201, the processor 202 and the communication unit 203 being electrically connected to each other, directly or indirectly, to enable the transmission or interaction of data. 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, a storage drive, and the like.
Wherein the volatile Memory may be, by way of example only, a Random Access Memory (RAM). The nonvolatile Memory may be a Read Only Memory (ROM), a Programmable Read Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an electrically Erasable Programmable Read-Only Memory (EEPROM), a flash Memory, or the like; the storage drive may be a magnetic disk drive, a solid state drive, any type of storage disk (e.g., optical disk, DVD, etc.), or similar storage medium, or combinations thereof, etc.
The communication unit 203 is used for transmitting and receiving data via a network. In some embodiments, the Network may include a wired Network, a Wireless Network, a fiber optic Network, a telecommunication Network, an intranet, the internet, a Local Area Network (LAN), a Wide Area Network (WAN), a Wireless Local Area Network (WLAN), a Metropolitan Area Network (MAN), a Wide Area Network (WAN), a Public Switched Telephone Network (PSTN), a bluetooth Network, a ZigBee Network, a 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 having signal processing capabilities, and may include one or more processing cores (e.g., a single-core processor or a multi-core processor). Merely by way of example, the Processor may include a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), an Application Specific Instruction Set Processor (ASIP), a Graphics Processing Unit (GPU), a Physical Processing Unit (PPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), a Programmable Logic Device (PLD), a controller, a microcontroller Unit, a Reduced Instruction Set computer (Reduced Instruction Set computer), a 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 ways. The apparatus embodiments described above are merely illustrative and, for example, the flowcharts and block diagrams in the figures 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 only for 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 conceive of changes or substitutions within the technical scope of the present application, and all such changes or substitutions are included in 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 (10)
1. A method for determining a charge-discharge cut-off voltage of a battery cell is characterized by comprising the following steps:
obtaining a preset cell safety factor of a target cell and a first safety factor of a first material, wherein the first material is used as a first electrode of the target cell;
obtaining a second safety factor of a second material according to the constraint relation among the battery cell safety factor, the first safety factor and a second safety factor of the second material; wherein the second material is used as a second electrode of the target cell, and the first safety factor and the second safety factor are respectively in positive correlation with the cell safety factor;
the first safety factor and the first voltage have a first safety relation, the first safety relation represents the change trend of the safety degree of the first material along with the open-circuit voltage during charging, and the first voltage when the first material is used as the first electrode is determined according to the first safety factor;
the second safety factor and the second voltage have a second safety relation, the second safety relation represents the change trend of the safety degree of the second material along with the open-circuit voltage during discharging, and the second voltage when the second material is used as the second electrode is determined according to the second safety factor;
and obtaining the charge-discharge cutoff voltage of the target battery cell according to the first voltage and the second voltage.
2. The method according to claim 1, wherein the first safety relationship includes a correspondence relationship between a plurality of first coefficients and a plurality of first open-circuit voltages; determining a first voltage of the first material as the first electrode based on the first safety factor comprises:
determining the first safety factor from the plurality of first coefficients according to the material safety characteristics of the first material;
and taking the first open-circuit voltage corresponding to the first safety factor as the first voltage.
3. The method for determining the cell charge-discharge cutoff voltage according to claim 2, further comprising:
obtaining a first state sequence acquired during charging of a first half-cell made of the first material, the first state sequence comprising a plurality of pairs of charging-related information, each pair of the charging-related information comprising a first open-circuit voltage corresponding to a specific capacity of the first half-cell and the specific capacity;
determining a plurality of pairs of target charging correlation information from sequence segments located at the end of the first state sequence;
establishing a corresponding relation between a 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.
4. The method according to claim 1, wherein the second safety relationship includes a correspondence relationship between a plurality of second coefficients and a plurality of second open-circuit voltages; determining a second voltage when the second material is used as the second electrode according to the second safety factor, wherein the determining the second voltage comprises:
determining the second safety factor from the plurality of second coefficients according to the material safety characteristics of the second material;
and taking a second open-circuit voltage corresponding to the second safety factor as the second voltage.
5. The method for determining the cell charge-discharge cutoff voltage according to claim 4, further comprising:
acquiring a second state sequence acquired during discharge of a second half-cell made of the second material, wherein the second state sequence comprises a plurality of pairs of discharge related information, and each pair of the discharge related information comprises a second open-circuit voltage corresponding to the specific capacity of the second half-cell;
determining a plurality of pairs of target discharge related information from a second sequence segment at the end of the second state sequence;
establishing a corresponding relationship between a second open-circuit voltage in the plurality of pairs of target discharge-related information and the plurality of second coefficients positively correlated to the second open-circuit voltage in the plurality of pairs of target discharge-related information.
6. The method for determining the battery cell charge-discharge cutoff voltage according to claim 1, wherein the first safety factor, the second safety factor, and the battery cell safety factor satisfy the following constraint relationship:
C＝αC 1 +βC 2
in the formula, C represents the cell safety factor, C 1 Representing said first safety factor, alpha representing said first safety factorWeight, C 2 Represents the second safety factor and beta represents a weight of the second safety factor.
7. The method for determining the cell charge/discharge cutoff voltage according to claim 1, wherein the determining the charge/discharge cutoff voltage of the target cell according to the first voltage and the second voltage includes:
and taking the absolute value of the difference between the first voltage and the second voltage as the charge-discharge cutoff voltage of the target battery cell.
8. A cell charge-discharge cutoff voltage determination apparatus, the apparatus comprising:
the safety factor module is used for acquiring a preset cell safety factor of a target cell and a first safety factor of a first material, wherein the first material is used as a first electrode of the target cell;
the safety coefficient module is further used for obtaining a second safety coefficient of a second material according to the constraint relationship among the battery cell safety coefficient, the first safety coefficient and a second safety coefficient of the second material; wherein the second material is used as a second electrode of the target cell, and the first safety factor and the second safety factor are respectively in positive correlation with the cell safety factor;
the voltage calculation module is used for determining a first voltage when the first material is used as the first electrode according to the first safety factor; wherein the first safety factor and the first voltage have a first safety relation, and the first safety relation represents the variation trend of the safety degree of the first material along with the open-circuit voltage during charging;
the voltage calculation module is further configured to determine a second voltage when the second material is used as the second electrode according to the second safety factor; the second safety factor and the second voltage have a second safety relation, and the second safety relation represents the change trend of the safety degree of the second material along with the open-circuit voltage during discharging;
the voltage calculation module is further configured to obtain a cut-off voltage of the target electric core according to the first voltage and the second voltage.
9. A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, the method for determining the cell charge/discharge cutoff voltage according to any one of claims 1 to 7 is implemented.
10. An analysis apparatus, characterized in that the analysis apparatus comprises a processor and a memory, the memory stores a computer program, and when the computer program is executed by the processor, the method for determining a cell charge/discharge cutoff voltage according to any one of claims 1 to 7 is implemented.
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