CN114325448A - Lithium battery evaluation method and device, computer equipment and readable storage medium - Google Patents
Lithium battery evaluation method and device, computer equipment and readable storage medium Download PDFInfo
- Publication number
- CN114325448A CN114325448A CN202111653154.7A CN202111653154A CN114325448A CN 114325448 A CN114325448 A CN 114325448A CN 202111653154 A CN202111653154 A CN 202111653154A CN 114325448 A CN114325448 A CN 114325448A
- Authority
- CN
- China
- Prior art keywords
- lithium battery
- capacity
- charging
- charging voltage
- cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 167
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 167
- 238000011156 evaluation Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000006185 dispersion Substances 0.000 claims description 34
- 238000004590 computer program Methods 0.000 claims description 12
- 239000000178 monomer Substances 0.000 claims description 7
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 12
- 230000006870 function Effects 0.000 description 4
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 3
- DVATZODUVBMYHN-UHFFFAOYSA-K lithium;iron(2+);manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[Fe+2].[O-]P([O-])([O-])=O DVATZODUVBMYHN-UHFFFAOYSA-K 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- ILXAVRFGLBYNEJ-UHFFFAOYSA-K lithium;manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[O-]P([O-])([O-])=O ILXAVRFGLBYNEJ-UHFFFAOYSA-K 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Landscapes
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The embodiment of the application discloses an evaluation method and device of a lithium battery, computer equipment and a readable storage medium. The lithium battery comprises at least two single battery cells, and the method comprises the following steps: acquiring a first charging voltage, a second charging voltage and a charging current of a lithium battery; calculating the charging capacity of the lithium battery according to the charging current and the preset time length; calculating the capacity of each single battery cell according to the charging capacity, the first charge state of each single battery cell and the second charge state of each single battery cell, wherein the first charge state is the charge state corresponding to the first charging voltage, and the second charge state is the charge state corresponding to the second charging voltage; and calculating the capacity of the lithium battery according to the capacity of each single battery cell, and evaluating the performance of the lithium battery according to the capacity of the lithium battery. The evaluation method for the lithium battery provided by the embodiment of the application can improve the accuracy of lithium battery performance evaluation.
Description
Technical Field
The present disclosure relates to the field of battery evaluation, and in particular, to a method and an apparatus for evaluating a lithium battery, a computer device, and a readable storage medium.
Background
At present, the performance of the lithium battery is evaluated mainly through visual experiences of obviously reducing the endurance mileage after a user uses the lithium battery for a period of time, and the accuracy of the performance evaluation of the lithium battery is not high. Therefore, how to improve the accuracy of lithium battery performance evaluation is a technical problem which needs to be solved urgently at present.
Disclosure of Invention
An objective of the present application is to provide a method and an apparatus for evaluating a lithium battery, a computer device, and a readable storage medium, so as to solve the problem of how to improve the accuracy of evaluating the performance of the lithium battery.
In a first aspect, an embodiment of the present application provides an evaluation method for a lithium battery, where the lithium battery includes at least two single battery cells, and the method includes:
acquiring a first charging voltage, a second charging voltage and a charging current of the lithium battery, wherein the first charging voltage is the voltage of the monomer battery cell before a preset charging time of the lithium battery, and the second charging voltage is the voltage of the monomer battery cell after the preset charging time of the lithium battery;
calculating the charging capacity of the lithium battery according to the charging current and the preset time length;
calculating the capacity of each single battery cell according to the charging capacity, a first charge state of each single battery cell and a second charge state of each single battery cell, wherein the first charge state is a charge state corresponding to the first charging voltage, and the second charge state is a charge state corresponding to the second charging voltage;
and calculating the capacity of the lithium battery according to the capacity of each single battery cell, and evaluating the performance of the lithium battery according to the capacity of the lithium battery.
In an alternative embodiment, the calculating the capacity of each of the unit cells according to the charging capacity, the first state of charge of each of the unit cells, and the second state of charge of each of the unit cells includes:
subtracting the first charge state of each single battery cell from the second charge state of each single battery cell to obtain a plurality of charge state difference values;
and dividing the charging capacity by the plurality of state of charge differences respectively to obtain the capacity of each single battery cell.
In an alternative embodiment, the evaluating the performance of the lithium battery according to the capacity of the lithium battery includes:
if the capacity of the lithium battery is larger than or equal to the average capacity threshold value, determining that the performance of the lithium battery is normal;
and if the capacity of the lithium battery is smaller than the average capacity threshold value, determining that the performance of the lithium battery is abnormal.
In an optional embodiment, before calculating the capacity of each of the unit cells, the method further includes:
calculating a dispersion of each first charging voltage based on all the first charging voltages;
and evaluating the consistency of the lithium battery according to the dispersion of each first charging voltage.
In an alternative embodiment, the evaluating the lithium battery according to the dispersion of each first charging voltage includes:
and if the absolute value of each dispersion is smaller than or equal to the dispersion threshold, determining that the consistency of the lithium battery is normal, and calculating the capacity of each single battery cell according to the charging capacity, each first charge state and the corresponding second charge state.
In an alternative embodiment, the calculating the dispersion of each first charging voltage includes:
calculating a first charging voltage mean value according to all the first charging voltages;
subtracting a first charging voltage mean value from each first charging voltage to obtain a plurality of first charging voltage difference values;
and dividing the plurality of first charging voltage difference values by the first charging voltage mean value multiplied by one hundred percent to obtain the dispersion of each first charging voltage.
In an alternative embodiment, the first charging voltage is equal to or greater than 3.5V.
In a second aspect, an embodiment of the present application provides an evaluation apparatus for a lithium battery, where the lithium battery includes at least two unit cells, and the evaluation apparatus includes:
an obtaining module, configured to obtain a first charging voltage, a second charging voltage, and a charging current of the lithium battery, where the first charging voltage is a voltage of the cell before a preset charging duration of the lithium battery, and the second charging voltage is a voltage of the cell after the preset charging duration of the lithium battery;
the charging capacity calculation module is used for calculating the charging capacity of the lithium battery according to the charging current and the preset time length;
the capacity calculation module of the single battery cell is configured to calculate the capacity of each single battery cell according to the charging capacity, a first charge state of each single battery cell, and a second charge state of each single battery cell, where the first charge state is a charge state corresponding to the first charging voltage, and the second charge state is a charge state corresponding to the second charging voltage;
and the evaluation module is used for calculating the capacity of the lithium battery according to the capacity of each single battery cell and evaluating the performance of the lithium battery according to the capacity of the lithium battery.
In a third aspect, an embodiment of the present application provides a computer device, where the computer device includes a memory and a processor, where the memory stores a computer program, and when the processor executes the computer program, the method for evaluating a lithium battery according to the first aspect is implemented.
In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the method for evaluating a lithium battery according to the first aspect is implemented.
The embodiment of the application provides an evaluation method and device, computer equipment and a readable storage medium for a lithium battery, wherein the lithium battery comprises at least two single battery cells, and the method comprises the following steps: acquiring a first charging voltage, a second charging voltage and a charging current of the lithium battery; calculating the charging capacity of the lithium battery according to the charging current and the preset time length; calculating the capacity of each single battery cell according to the charging capacity, the first charge state of each single battery cell and the second charge state of each single battery cell; and calculating the capacity of the lithium battery according to the capacity of each single battery cell, and evaluating the performance of the lithium battery according to the capacity of the lithium battery. Calculating the capacity of each single battery cell through the charging capacity, the first charge state of each single battery cell and the second charge state of each single battery cell, and calculating the capacity of the lithium battery according to the capacity of each single battery cell, so that the accuracy of determining the capacity of the lithium battery is improved; the performance of the lithium battery is evaluated according to the capacity of the lithium battery, and the accuracy of the performance evaluation of the lithium battery can be improved.
Drawings
In order to more clearly explain the technical solutions of the present application, the drawings needed to be used in the embodiments are briefly introduced below, and 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 of protection of the present application. Like components are numbered similarly in the various figures.
Fig. 1 is a schematic block diagram illustrating a flow of steps of an evaluation method for a lithium battery provided in an embodiment of the present application;
fig. 2 is a schematic diagram illustrating an SOC-OCV curve of a single cell provided in an embodiment of the present application;
fig. 3 is a schematic diagram illustrating a first state of charge and a second state of charge of a single cell provided in an embodiment of the present application;
fig. 4 shows a block diagram schematically illustrating a structure of an evaluation apparatus for a lithium battery according to an embodiment of the present application.
Detailed Description
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 only a part of the embodiments of the present application, and not all of the 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 of the present application without making any creative effort, shall fall within the protection scope of the present application.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present application, are intended to indicate only specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present application belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments.
Example 1
Referring to fig. 1, fig. 1 is a schematic block diagram illustrating a flow of steps of an evaluation method for a lithium battery according to an embodiment of the present application.
As shown in fig. 1, the evaluation method for a lithium battery provided in the embodiment of the present application may be applied to a server, where the lithium battery includes at least two single battery cells, and the method includes S110 to S140.
S110: acquiring a first charging voltage, a second charging voltage and a charging current of the lithium battery, wherein the first charging voltage is the voltage of the monomer battery cell before the preset time of charging the lithium battery, and the second charging voltage is the voltage of the monomer battery cell after the preset time of charging the lithium battery.
In the present embodiment, the first charging voltage Vn0May be the voltage before the charging or the charging period t1The subsequent voltage. Correspondingly, the second charging voltage Vn1Can preset time t for charging2The voltage thereafter may be charged (t)1+t2) The voltage after the voltage is not limited herein. It can be understood that, in the embodiment, the lithium battery includes 10 strings of single battery cells, and the preset time period t2For example, the charging current I of the lithium battery is 4.5A after 10min, and the number of the single battery cells included in the lithium battery, the preset time period, and the charging current of the lithium battery may be selected according to actual situations, which is not limited herein.
Preferably, the first charging voltage is 3.5V or more.
S120: and calculating the charging capacity of the lithium battery according to the charging current and the preset time length.
In this embodiment, the first preset formula for calculating the charging capacity of the lithium battery is as follows:
ΔC＝It
where Δ C represents a charging capacity of the lithium battery, I represents the charging current, and t represents the preset time period.
It is understood that when the charging current is not a constant current, the charging capacity per unit time may be calculated by device recording or an integration method. For the lithium battery charged in the constant current stage, the charging capacity of the lithium battery can be directly calculated by multiplying the charging current by the preset time, the equipment does not need to have the capacity of recording the charging capacity, and the requirement on the equipment is reduced.
Specifically, according to the charging current I being 4.5A, the preset time period t2The charge capacity Δ C of the lithium battery was obtained as 4.5 × 10/60 as 0.75Ah for 10 min.
S130: calculating the capacity of each single battery cell according to the charging capacity, the first charge state of each single battery cell and the second charge state of each single battery cell, wherein the first charge state is the charge state corresponding to the first charging voltage, and the second charge state is the charge state corresponding to the second charging voltage.
Referring to fig. 2 and fig. 3 together, fig. 2 shows a schematic diagram of an SOC-OCV curve of a single cell provided in an embodiment of the present application, and fig. 3 shows a schematic diagram of a first state of charge and a second state of charge of a single cell provided in an embodiment of the present application. In this embodiment, a SOC-OCV (state of charge-open circuit voltage method) test is performed with a charging current of 4.5A, a cut-off voltage of 4.17V, and a cut-off current of 700mA to obtain an SOC-OVC curve of a single cell as shown in fig. 2, wherein an ordinate represents a current open circuit voltage of a lithium battery, and an abscissa represents whether a state of charge SOC of the battery is at the current open circuit voltage OCV. According to the SOC-OVC curve in fig. 2, a first state of charge corresponding to the first charging voltage and a second state of charge corresponding to the second charging voltage can be obtained as shown in fig. 3.
It can be understood that the charge and discharge method of the SOC-OCV curve of the single battery cell is consistent with or similar to the charge and discharge method of the lithium battery in actual use. And judging whether the charge-discharge method of the SOC-OCV curve of the single battery cell is consistent with or similar to the charge-discharge method in the actual use of the lithium battery or not through the charge-discharge current, the upper and lower limit voltages and the cut-off current.
Optionally, the second state of charge corresponding to the first charging voltage and the second state of charge corresponding to the second charging voltage may also be determined according to an actual charging condition, which is not limited herein.
In an optional embodiment, the first cell of each of the unit cells according to the charging capacityState of charge SOC (V)n0) And a second state of charge SOC (V) of each of the individual cellsn1) Calculating the capacity of each single battery cell, including:
subtracting the first charge state of each single battery cell from the second charge state of each single battery cell to obtain a plurality of charge state difference values;
and dividing the charging capacity by the plurality of state of charge differences respectively to obtain the capacity of each single battery cell.
Specifically, the second preset formula for calculating the capacity of the single battery cell is as follows:
wherein, CnRepresents the charge capacity of the single battery cell.
The numerical values of the first charging voltage, the second charging voltage, the state of charge difference value and the capacity of 10 strings of single battery cells in the embodiment of the application are shown in table 1:
TABLE 1
| Item | Cell 1 | Cell 2 | Cell 3 | Cell 4 | Cell 5 | Cell 6 | Cell 7 | Cell 8 | Cell 9 | Cell 10 |
| Vno/mv | 3871 | 3774 | 3773 | 3769 | 3773 | 3740 | 3769 | 3775 | 3781 | 3808 |
| Vn1/mv | 3838 | 3831 | 3829 | 3826 | 3829 | 3790 | 3824 | 3831 | 3839 | 3864 |
| ΔSOC/％ | 6.20 | 6.24 | 6.11 | 6.18 | 6.11 | 5.59 | 5.97 | 6.11 | 6.22 | 6.20 |
| Cn/Ah | 12.10 | 12.02 | 12.27 | 12.14 | 12.27 | 12.61 | 12.56 | 12.27 | 12.06 | 12.10 |
The Δ SOC represents a state of charge difference, Cell 1 represents a first Cell, Cell 2 represents a second Cell, and so on, and Cell 10 represents a tenth Cell.
In order to timely and effectively evaluate the consistency of the lithium battery, before calculating the capacity of each single battery cell, the method further includes:
calculating a dispersion of each first charging voltage based on all the first charging voltages;
and evaluating the consistency of the lithium battery according to the dispersion of each first charging voltage.
In this embodiment, the consistency of the lithium batteries refers to the convergence of important characteristic parameters of a group of lithium batteries. Through every dispersion of first charging voltage, the aassessment the uniformity of lithium cell is favorable to discerning in advance unusual lithium cell, improves the reliability of lithium cell.
In an alternative embodiment, the calculating the dispersion of each first charging voltage includes:
calculating a first charging voltage mean value according to all the first charging voltages;
subtracting a first charging voltage mean value from each first charging voltage to obtain a plurality of first charging voltage difference values;
and dividing the plurality of first charging voltage difference values by the first charging voltage mean value multiplied by one hundred percent to obtain the dispersion of each first charging voltage.
Specifically, the third preset formula for calculating the first charge voltage average value is as follows:
wherein, Vn0avgRepresenting the first average charging voltage; n represents the number of the first charging voltages.
Further, according to the first charging voltage corresponding to each monomer battery cell in table 1, V is calculated and obtainedn0avg＝3774.3mV。
The fourth preset formula for calculating the dispersion of the first charging voltage is as follows:
where dn represents a dispersion of the first charging voltage.
The dispersion value corresponding to the first charging voltage of 10 strings of single battery cells in the embodiment of the present application is shown in table 2:
TABLE 2
| Item | Cell 1 | Cell 2 | Cell 3 | Cell 4 | Cell 5 | Cell 6 | Cell 7 | Cell 8 | Cell 9 | Cell 10 |
| Vno/mv | 3871 | 3774 | 3773 | 3769 | 3773 | 3740 | 3769 | 3775 | 3781 | 3808 |
| Vn1/mv | 3838 | 3831 | 3829 | 3826 | 3829 | 3790 | 3824 | 3831 | 3839 | 3864 |
| dn/％ | 0.178 | -0.008 | -0.034 | -0.140 | -0.034 | -0.909 | -0.140 | 0.019 | 0.178 | 0.893 |
In an alternative embodiment, the evaluating the lithium battery according to the dispersion of each first charging voltage includes:
and if the absolute value of each dispersion is smaller than or equal to the dispersion threshold, determining that the consistency of the lithium battery is normal, and calculating the capacity of each single battery cell according to the charging capacity, each first charge state and the corresponding second charge state.
As an example, if the dispersion threshold is 1.5%, the absolute values of the dispersions of the ten battery cells in table 2 are all less than or equal to the dispersion threshold, and it is determined that the consistency of the lithium battery is normal. The dispersion threshold may be set according to actual conditions, and is not limited herein.
It is understood that if at least one absolute value of the dispersion is greater than the dispersion threshold value, and the consistency of the lithium battery is determined to be abnormal, the subsequent evaluation on the performance of the lithium battery is not performed. For example, if the dispersion threshold is 0.15%, the absolute values of the dispersions of the first cell and the ninth cell in table 2 are both greater than the dispersion threshold, and it is determined that the consistency of the lithium battery is abnormal, and subsequent performance evaluation on the lithium battery is not performed.
S140: and calculating the capacity of the lithium battery according to the capacity of each single battery cell, and evaluating the performance of the lithium battery according to the capacity of the lithium battery.
In this embodiment, the average value of the capacities of the individual battery cells is calculated according to the capacity of each individual battery cell, the average value of the capacities of the individual battery cells is used as the capacity of the lithium battery, and the performance of the lithium battery is evaluated according to the capacity of the lithium battery, so that the accuracy of evaluating the performance of the lithium battery can be improved.
In an alternative embodiment, the evaluating the performance of the lithium battery according to the capacity of the lithium battery includes:
if the capacity of the lithium battery is larger than or equal to the average capacity threshold value, determining that the performance of the lithium battery is normal;
and if the capacity of the lithium battery is smaller than the average capacity threshold value, determining that the performance of the lithium battery is abnormal.
Specifically, the average capacity threshold is related to the service life of the lithium battery, and the longer the service life is, the smaller the average capacity threshold is.
Still taking the data in table 1 as an example, the average value of the cell capacities of the single cells is 12.24Ah, that is, the capacity of the lithium battery is 12.24 Ah. If the average capacity threshold value is 12Ah, determining that the performance of the lithium battery is normal; and if the average capacity threshold is 13Ah, determining that the performance of the lithium battery is abnormal.
It is worth noting that the evaluation method of the lithium battery provided by the embodiment is suitable for a material system with obviously changed discharge platforms of nickel cobalt lithium manganate, lithium-rich manganese, lithium iron manganese phosphate or a composite of the nickel cobalt lithium manganate, the lithium iron manganese phosphate or the composite of the nickel cobalt lithium manganate, the lithium manganese phosphate and the lithium iron manganese phosphate. Meanwhile, the present embodiment takes the charging stage of the lithium battery as an example, but the evaluation method of the lithium battery provided by the present embodiment can also be applied to the discharging stage of the lithium battery.
The evaluation method for the lithium battery provided by the embodiment of the application comprises the following steps: acquiring a first charging voltage, a second charging voltage and a charging current of the lithium battery; calculating the charging capacity of the lithium battery according to the charging current and the preset time length; calculating the capacity of each single battery cell according to the charging capacity, the first charge state of each single battery cell and the second charge state of each single battery cell; and calculating the capacity of the lithium battery according to the capacity of each single battery cell, and evaluating the performance of the lithium battery according to the capacity of the lithium battery. Calculating the capacity of each single battery cell through the charging capacity, the first charge state of each single battery cell and the second charge state of each single battery cell, and calculating the capacity of the lithium battery according to the capacity of each single battery cell, so that the accuracy of determining the capacity of the lithium battery is improved; the performance of the lithium battery is evaluated according to the capacity of the lithium battery, and the accuracy of the performance evaluation of the lithium battery can be improved.
Example 2
Referring to fig. 4, fig. 4 is a schematic block diagram illustrating a structure of an evaluation apparatus for a lithium battery according to an embodiment of the present application. The evaluation device 500 for the lithium battery comprises an obtaining module 510, a charging capacity calculating module 520, a capacity calculating module 530 for a single battery cell, and an evaluating module 540.
The obtaining module 510 is configured to obtain a first charging voltage, a second charging voltage, and a charging current of the lithium battery, where the first charging voltage is a voltage of the single battery cell before a preset charging duration of the lithium battery, and the second charging voltage is a voltage of the single battery cell after the preset charging duration of the lithium battery;
the charging capacity calculation module 520 is configured to calculate the charging capacity of the lithium battery according to the charging current and the preset time duration;
the cell capacity calculation module 530 is configured to calculate a capacity of each cell according to the charging capacity, a first state of charge of each cell, and a second state of charge of each cell, where the first state of charge is a state of charge corresponding to the first charging voltage, and the second state of charge is a state of charge corresponding to the second charging voltage;
the evaluation module 540 is configured to calculate the capacity of the lithium battery according to the capacity of each single battery cell, and evaluate the performance of the lithium battery according to the capacity of the lithium battery.
The above device is used for executing the method provided in embodiment 1, and the implementation principle and technical effect are similar, which are not described herein again.
The embodiment of the application further discloses computer equipment, the computer equipment comprises a memory and a processor, the memory stores a computer program, and the computer program realizes the evaluation method of the lithium battery in the embodiment 1 when the processor executes the computer program.
The embodiment of the application also discloses a computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the evaluation method of the lithium battery as described in embodiment 1 is realized.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative and, for example, the flowchart 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 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.
In addition, each functional module or unit in each embodiment 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.
The functions, 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 smart phone, 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. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific 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 the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application.
Claims (10)
1. An evaluation method of a lithium battery, wherein the lithium battery includes at least two unit cells, comprising:
acquiring a first charging voltage, a second charging voltage and a charging current of the lithium battery, wherein the first charging voltage is the voltage of the monomer battery cell before a preset charging time of the lithium battery, and the second charging voltage is the voltage of the monomer battery cell after the preset charging time of the lithium battery;
calculating the charging capacity of the lithium battery according to the charging current and the preset time length;
calculating the capacity of each single battery cell according to the charging capacity, a first charge state of each single battery cell and a second charge state of each single battery cell, wherein the first charge state is a charge state corresponding to the first charging voltage, and the second charge state is a charge state corresponding to the second charging voltage;
and calculating the capacity of the lithium battery according to the capacity of each single battery cell, and evaluating the performance of the lithium battery according to the capacity of the lithium battery.
2. The method of claim 1, wherein calculating the capacity of each of the cell cells from the charge capacity, the first state of charge of each of the cell cells, and the second state of charge of each of the cell cells comprises:
subtracting the first charge state of each single battery cell from the second charge state of each single battery cell to obtain a plurality of charge state difference values;
and dividing the charging capacity by the plurality of state of charge differences respectively to obtain the capacity of each single battery cell.
3. The method of claim 1, wherein evaluating the performance of the lithium battery based on the capacity of the lithium battery comprises:
if the capacity of the lithium battery is larger than or equal to the average capacity threshold value, determining that the performance of the lithium battery is normal;
and if the capacity of the lithium battery is smaller than the average capacity threshold value, determining that the performance of the lithium battery is abnormal.
4. The method of claim 1, wherein before calculating the capacity of each of the individual cells, the method further comprises:
calculating a dispersion of each first charging voltage based on all the first charging voltages;
and evaluating the consistency of the lithium battery according to the dispersion of each first charging voltage.
5. The method of claim 4, wherein evaluating the lithium battery according to the dispersion of each first charging voltage comprises:
and if the absolute value of each dispersion is smaller than or equal to the dispersion threshold, determining that the consistency of the lithium battery is normal, and calculating the capacity of each single battery cell according to the charging capacity, each first charge state and the corresponding second charge state.
6. The method of claim 4, wherein calculating the dispersion of each first charging voltage comprises:
calculating a first charging voltage mean value according to all the first charging voltages;
subtracting a first charging voltage mean value from each first charging voltage to obtain a plurality of first charging voltage difference values;
and dividing the plurality of first charging voltage difference values by the first charging voltage mean value multiplied by one hundred percent to obtain the dispersion of each first charging voltage.
7. The method of claim 1, wherein the first charging voltage is 3.5V or greater.
8. An evaluation device for a lithium battery, wherein the lithium battery comprises at least two individual cells, comprising:
an obtaining module, configured to obtain a first charging voltage, a second charging voltage, and a charging current of the lithium battery, where the first charging voltage is a voltage of the cell before a preset charging duration of the lithium battery, and the second charging voltage is a voltage of the cell after the preset charging duration of the lithium battery;
the charging capacity calculation module is used for calculating the charging capacity of the lithium battery according to the charging current and the preset time length;
the capacity calculation module of the single battery cell is configured to calculate the capacity of each single battery cell according to the charging capacity, a first charge state of each single battery cell, and a second charge state of each single battery cell, where the first charge state is a charge state corresponding to the first charging voltage, and the second charge state is a charge state corresponding to the second charging voltage;
and the evaluation module is used for calculating the capacity of the lithium battery according to the capacity of each single battery cell and evaluating the performance of the lithium battery according to the capacity of the lithium battery.
9. A computer device, characterized in that the computer device comprises a memory and a processor, the memory storing a computer program which, when executed by the processor, implements the method of evaluation of a lithium battery as claimed in any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that a computer program is stored thereon, which, when being executed by a processor, carries out a method of evaluating a lithium battery according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111653154.7A CN114325448A (en) | 2021-12-30 | 2021-12-30 | Lithium battery evaluation method and device, computer equipment and readable storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111653154.7A CN114325448A (en) | 2021-12-30 | 2021-12-30 | Lithium battery evaluation method and device, computer equipment and readable storage medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114325448A true CN114325448A (en) | 2022-04-12 |
Family
ID=81018645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111653154.7A Pending CN114325448A (en) | 2021-12-30 | 2021-12-30 | Lithium battery evaluation method and device, computer equipment and readable storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114325448A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115469239A (en) * | 2022-06-29 | 2022-12-13 | 四川新能源汽车创新中心有限公司 | Method and device for evaluating consistency of state of charge of battery system and electronic equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109148978A (en) * | 2017-06-19 | 2019-01-04 | 宁德时代新能源科技股份有限公司 | Capacity balancing method and system for battery pack |
| CN109557477A (en) * | 2017-09-25 | 2019-04-02 | 郑州宇通客车股份有限公司 | A kind of battery system health status evaluation method |
| CN110797577A (en) * | 2019-10-29 | 2020-02-14 | 中兴高能技术有限责任公司 | Lithium ion battery charging method and device and computer storage medium |
| CN113075575A (en) * | 2021-03-04 | 2021-07-06 | 湖南大学 | Vehicle battery pack safety state evaluation method, system, device and storage medium |
| CN113552494A (en) * | 2021-07-19 | 2021-10-26 | 星恒电源股份有限公司 | Low-temperature step charging method and testing method for lithium ion battery |
| CN113655395A (en) * | 2021-08-17 | 2021-11-16 | 星恒电源股份有限公司 | Method for evaluating service state of lithium battery for electric bicycle |
-
2021
- 2021-12-30 CN CN202111653154.7A patent/CN114325448A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109148978A (en) * | 2017-06-19 | 2019-01-04 | 宁德时代新能源科技股份有限公司 | Capacity balancing method and system for battery pack |
| CN109557477A (en) * | 2017-09-25 | 2019-04-02 | 郑州宇通客车股份有限公司 | A kind of battery system health status evaluation method |
| CN110797577A (en) * | 2019-10-29 | 2020-02-14 | 中兴高能技术有限责任公司 | Lithium ion battery charging method and device and computer storage medium |
| CN113075575A (en) * | 2021-03-04 | 2021-07-06 | 湖南大学 | Vehicle battery pack safety state evaluation method, system, device and storage medium |
| CN113552494A (en) * | 2021-07-19 | 2021-10-26 | 星恒电源股份有限公司 | Low-temperature step charging method and testing method for lithium ion battery |
| CN113655395A (en) * | 2021-08-17 | 2021-11-16 | 星恒电源股份有限公司 | Method for evaluating service state of lithium battery for electric bicycle |
Non-Patent Citations (1)
| Title |
|---|
| 魏莹等: "《动力电池管理与维护技术》", vol. 1, 江苏大学出版社, pages: 13 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115469239A (en) * | 2022-06-29 | 2022-12-13 | 四川新能源汽车创新中心有限公司 | Method and device for evaluating consistency of state of charge of battery system and electronic equipment |
| CN115469239B (en) * | 2022-06-29 | 2023-09-08 | 四川新能源汽车创新中心有限公司 | Method and device for evaluating charge state consistency of battery system and electronic equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3550317B1 (en) | Method and device for detecting battery micro-short circuit | |
| CN109856559B (en) | Lithium battery cycle life prediction method | |
| CN108318775B (en) | Method and device for diagnosing battery short-circuit fault on line | |
| KR102420091B1 (en) | Apparatus and method for diagnosing battery cell | |
| US20220179003A1 (en) | Characterisation of lithium plating in rechargeable batteries | |
| KR102206606B1 (en) | Apparatus for estimating remain capacity | |
| EP3832331B1 (en) | Cell state estimation device and cell control device | |
| JP2022503509A (en) | Battery state estimator | |
| CN112485685A (en) | Power bearing capacity parameter determination method and device and electronic equipment | |
| CN104681851A (en) | Method for matching lithium ion power batteries for automobiles | |
| CN114325448A (en) | Lithium battery evaluation method and device, computer equipment and readable storage medium | |
| CN108780927B (en) | Battery pack balancing method, battery management system and battery system | |
| CN110901472A (en) | Battery management system balancing capability matching method and device and computer equipment | |
| US10422824B1 (en) | System and method for efficient adaptive joint estimation of battery cell state-of-charge, resistance, and available energy | |
| CN113552494A (en) | Low-temperature step charging method and testing method for lithium ion battery | |
| CN114103729B (en) | Method and device for balancing battery pack and electric automobile | |
| CN113687256B (en) | Method for evaluating influence of monomer self-discharge rate on consistency of battery system | |
| CN116256642A (en) | Lithium iron phosphate battery fault diagnosis method suitable for sparse data | |
| CN114047450A (en) | Available capacity consistency evaluation method and device for battery system | |
| CN113433458A (en) | Method and device for determining state of health of battery | |
| CN111600354B (en) | Grouping protection system for batteries used in echelon and battery pack forming method | |
| CN112748349B (en) | Battery leakage determination method, device, electronic device and storage medium | |
| CN116683052A (en) | Balancing capability evaluation method and device and electronic equipment | |
| CN111220911B (en) | Method and device for judging polarization state of lithium iron phosphate battery and electronic equipment | |
| CN116719701B (en) | Method and device for determining running state of energy storage system and computer equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |