CN111289910B - Grading method and device for echelon batteries, computer equipment and medium - Google Patents
Grading method and device for echelon batteries, computer equipment and medium Download PDFInfo
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- CN111289910B CN111289910B CN202010171405.7A CN202010171405A CN111289910B CN 111289910 B CN111289910 B CN 111289910B CN 202010171405 A CN202010171405 A CN 202010171405A CN 111289910 B CN111289910 B CN 111289910B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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- 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]
- G01R31/389—Measuring internal impedance, internal conductance or related 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
Abstract
The embodiment of the invention discloses a grading method and device for a echelon battery, computer equipment and a medium. The grading method comprises the following steps: acquiring the open-circuit voltage of a echelon battery to be detected, and determining a first power characteristic parameter corresponding to the open-circuit voltage according to the open-circuit voltage; determining residual capacity information according to the first power characteristic parameter, and determining the capacity grade of the battery to be tested corresponding to the residual capacity information from a battery capacity grade table; determining a second power characteristic parameter according to the residual capacity information, and determining the power grade of the battery to be tested in the echelon form corresponding to the second power characteristic parameter from a power characteristic parameter grade table; and determining the grading grade of the battery to be tested according to the capacity grade and the power grade. According to the technical scheme of the embodiment of the invention, the graded batteries are classified quickly and more accurately.
Description
Technical Field
The embodiment of the invention relates to the technical field of power batteries, in particular to a grading method and device for a echelon battery, computer equipment and a medium.
Background
With the increasing of the popularization and application of new energy automobiles, the concept of gradient utilization of power batteries is brought forward and is widely concerned. Echelon utilization refers to a process of continuing use in which a used product has reached its original design life and then its function is restored in whole or in part by other methods, and this process is a basic peer or degraded application.
The echelon battery refers to the condition that the waste battery is repaired to be well-filled. The unit of battery echelon utilization can be a battery pack, a module or a battery monomer, and the performance of the recycled battery pack, module or battery monomer is not uniform, so the performance of the recycled battery pack, module or battery monomer needs to be evaluated and graded to obtain full evaluation and utilization of the battery value, especially for the module and battery pack which need to be regrouped, the consistency of the batteries is an essential parameter, and if the batteries with different qualities are grouped into a battery module or battery pack, the performance of the module or battery pack is limited by the battery with the worst performance, and further the performance of the batteries is seriously influenced.
In the prior art, all-around tests are performed on the echelon battery, and all battery monomers contained in the echelon battery are generally required to be subjected to one-by-one capacity test, so that a great deal of time and resource waste is caused.
Disclosure of Invention
The embodiment of the invention provides a grading method and device for a echelon battery, computer equipment and a medium, so as to realize quick and more accurate grading of the echelon battery.
In a first aspect, an embodiment of the present invention provides a method for grading a graded battery, where the method includes:
acquiring the open-circuit voltage of a echelon battery to be detected, and determining a first power characteristic parameter corresponding to the open-circuit voltage according to the open-circuit voltage;
determining residual capacity information according to the first power characteristic parameter, and determining the capacity grade of the battery to be tested corresponding to the residual capacity information from a battery capacity grade table;
determining a second power characteristic parameter according to the residual capacity information, and determining the power grade of the battery to be tested in the echelon form corresponding to the second power characteristic parameter from a power characteristic parameter grade table;
and determining the grading grade of the battery to be tested according to the capacity grade and the power grade.
Optionally, before determining the remaining capacity information according to the first power characteristic parameter, the method further includes:
acquiring historical residual capacity information of a plurality of historical echelon batteries, and determining historical power characteristic parameters according to the historical residual capacity information;
and constructing a battery performance full life cycle test database according to the historical residual capacity information and the historical power characteristic parameters.
Optionally, obtaining historical remaining capacity information of a plurality of historical echelon batteries, and determining a historical power characteristic parameter according to the historical remaining capacity information includes:
acquiring historical residual capacity information of a plurality of historical echelon batteries, and setting a calibration point for the historical residual capacity information based on the capacity grade;
and carrying out a preset multiplying power current charge-discharge cycle test based on the historical residual capacity information of each calibration point to obtain the historical power characteristic parameter under each calibration point.
Optionally, the battery to be tested is a battery module or a battery pack to be tested;
obtaining the open-circuit voltage of the echelon battery to be tested, and determining a first power characteristic parameter corresponding to the open-circuit voltage according to the open-circuit voltage, wherein the method comprises the following steps:
the method comprises the steps of obtaining a single battery with the lowest open-circuit voltage in the echelon battery module to be detected or the echelon battery pack to be detected, and determining a first power characteristic parameter corresponding to the open-circuit voltage according to the open-circuit voltage corresponding to the single battery with the lowest open-circuit voltage.
Optionally, the battery capacity grade table is established by setting a capacity grade by a preset capacity threshold value until the capacity is reduced to a battery initial capacity setting range;
the power characteristic parameter grade table is established by taking the power characteristic parameters of the historical echelon battery under the set open-circuit voltage as a division standard and dividing the power characteristic parameters by the same number of parts as the division of the battery capacity grade table.
Optionally, the method further includes:
and acquiring the battery information of the battery to be tested in the echelon mode, and obtaining the grading result of the battery to be tested in the echelon mode according to the battery information and the grading grade of the battery to be tested in the echelon mode.
Optionally, the grading result of the battery to be tested is output in a form of a graph or a table.
In a second aspect, an embodiment of the present invention further provides a grading device for a graded battery, where the grading device includes:
the parameter determination module is used for acquiring the open-circuit voltage of the battery to be tested in the echelon mode and determining a first power characteristic parameter corresponding to the open-circuit voltage according to the open-circuit voltage;
the capacity grade determining module is used for determining residual capacity information according to the first power characteristic parameter and determining the capacity grade of the battery to be tested corresponding to the residual capacity information from a battery capacity grade table;
the power grade determining module is used for determining a second power characteristic parameter according to the residual capacity information and determining the power grade of the battery to be tested corresponding to the second power characteristic parameter from a power characteristic parameter grade table;
and the grading grade determining module is used for determining the grading grade of the battery to be tested according to the capacity grade and the power grade.
In a third aspect, an embodiment of the present invention further provides a computer device, where the computer device includes:
one or more processors;
a storage device for storing a plurality of programs,
when at least one of the programs is executed by the one or more processors, the one or more processors are caused to implement the grading method for graded batteries provided by the embodiment of the first aspect of the invention.
In a fourth aspect, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for grading a graded battery provided in the embodiment of the first aspect of the present invention.
According to the technical scheme of the embodiment of the invention, the open-circuit voltage of the battery to be tested is obtained, and the first power characteristic parameter corresponding to the open-circuit voltage is determined according to the open-circuit voltage; determining residual capacity information according to the first power characteristic parameter, and determining the capacity grade of the battery to be tested corresponding to the residual capacity information from a battery capacity grade table; determining a second power characteristic parameter according to the residual capacity information, and determining the power grade of the battery to be tested in the echelon form corresponding to the second power characteristic parameter from a power characteristic parameter grade table; and determining the grading grade of the battery to be tested according to the capacity grade and the power grade. The technical scheme of the embodiment of the invention solves the problem that in the prior art, all the battery monomers contained in the echelon battery are required to be subjected to one-by-one capacity test to perform all-around tests on the echelon battery, so that a large amount of time and resources are wasted, and the echelon battery is rapidly and accurately graded.
Drawings
Fig. 1 is a flowchart of a method for grading graded batteries according to an embodiment of the present invention;
fig. 2A is a flowchart of a method for grading graded batteries according to a second embodiment of the present invention;
FIG. 2B is a flowchart illustrating a battery grading operation performed on a battery to be tested according to an embodiment of the present invention;
FIG. 2C is a flowchart of the full lifecycle testing database establishment provided by an embodiment of the present invention;
fig. 3A is a flowchart of a method for grading graded batteries according to an embodiment of the present invention;
FIG. 3B is a schematic diagram of the components of an apparatus for performing a stepped battery grading, according to an embodiment of the present invention;
fig. 4 is a structural diagram of a grading apparatus for graded batteries according to a fourth embodiment of the present invention;
fig. 5 is a schematic hardware structure diagram of a computer device according to a fifth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.
It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings. Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Example one
Fig. 1 is a flowchart of a method for grading a battery in a echelon according to an embodiment of the present invention, where the embodiment is applicable to a situation where a retired battery cell, a battery cell body, or a battery pack is graded to use its remaining value, and the method may be executed by a grading apparatus for a battery in a echelon, and the apparatus may be implemented in a form of software and/or hardware. The method specifically comprises the following steps:
s110, obtaining the open-circuit voltage of the echelon battery to be tested, and determining a first power characteristic parameter corresponding to the open-circuit voltage according to the open-circuit voltage.
The type of the echelon battery to be tested can be a decommissioned battery monomer, a decommissioned battery module or a decommissioned battery pack and the like.
The open-circuit voltage refers to the terminal voltage of the battery to be tested in an open-circuit state, and the open-circuit voltage of the battery to be tested is equal to the difference between the potential of the positive electrode and the potential of the negative electrode of the battery to be tested when the battery to be tested is in an open circuit state.
The first power characteristic parameter can be 0.1-30s discharge energy of the battery to be tested under 1-5 multiplying power discharge current or direct current internal resistance of the battery to be tested.
Specifically, the discharge energy of the battery to be tested corresponding to the open-circuit voltage under the discharge current of 1-5 multiplying power is determined according to the open-circuit voltage of the battery to be tested, or the direct-current internal resistance of the battery to be tested corresponding to the open-circuit voltage is determined according to the open-circuit voltage of the battery to be tested.
It can be understood that when the echelon battery to be tested is a retired battery module or a retired battery pack, the first power characteristic parameter corresponding to the open-circuit voltage is determined according to a battery cell with the lowest open-circuit voltage in the retired battery module or the retired battery pack, that is, the first power characteristic parameter determined by the battery cell with the lowest open-circuit voltage is used as the first power characteristic parameter corresponding to the retired battery module or the retired battery pack.
And S120, determining residual capacity information according to the first power characteristic parameter, and determining the capacity grade of the battery to be tested in the echelon corresponding to the residual capacity information from a battery capacity grade table.
And substituting the first power characteristic parameter into a formula through a power characteristic parameter and residual capacity formula to obtain the residual capacity.
The battery capacity grade table is established by setting a capacity grade according to a preset capacity threshold value until the capacity is reduced to a battery initial capacity setting range. Specifically, the capacity grade is divided by taking the residual capacity of the retired battery as a defined standard, the capacity of the new battery is called initial capacity, the grade is the top grade, one capacity grade is set when the capacity is reduced by 2% -10%, and a battery capacity grade table is established until the capacity is reduced to 20% of the initial capacity.
Specifically, the capacity grade of the battery to be tested in the echelon corresponding to the residual capacity information is determined by inquiring the battery capacity grade table.
It should be noted that the capacity grade of the echelon battery to be tested can be obtained by two methods, one method is obtained from big data monitoring information of retired vehicles through an algorithm; the other method is that the battery to be tested is obtained by pulse discharge test, after the residual capacity information is obtained, the capacity grade is determined by comparing the grade of the capacity in the capacity grade distribution table. The method for obtaining the residual capacity through the pulse discharge test comprises the following steps: controlling the temperature of the battery to be 25 +/-2 ℃, measuring the open-circuit voltage of the battery to be tested in a echelon mode, comparing the open-circuit voltage with the open-circuit voltage of each calibration point in a database, taking a calculation curve of the calibration point closest to the open-circuit voltage, discharging the battery to be tested in the echelon mode for the same time with the same multiplying power as that of the calibration time, calculating the discharge energy or the direct-current internal resistance in the discharging process, and substituting the discharge energy or the direct-current internal resistance into the calculation curve to obtain the residual capacity.
S130, determining a second power characteristic parameter according to the residual capacity information, and determining the power grade of the battery to be tested in the echelon mode corresponding to the second power characteristic parameter from a power characteristic parameter grade table.
The second power characteristic parameter can be 0.1-30s discharge energy of the battery to be tested under 1-5 multiplying power discharge current, or the direct current internal resistance of the battery to be tested.
It can be understood that the power characteristic parameter grade table is established by taking the power characteristic parameter of the historical graded battery under the set open-circuit voltage as a division standard and dividing the power characteristic parameter by the same number of parts as the battery capacity grade table.
Specifically, the power grade division is to use a power parameter of the retired battery under a certain specific open-circuit voltage as a grade division standard, divide the parameter of the new battery and the power parameter when the capacity is 20% of the remaining capacity into the same number of parts as the capacity grade, and establish a power characteristic parameter grade table with each part as a power grade.
Specifically, the power grade of the battery to be tested in the echelon corresponding to the second power characteristic parameter is determined according to the second power characteristic parameter by inquiring the power characteristic parameter grade table.
And S140, determining the grading grade of the battery to be tested according to the capacity grade and the power grade.
For example, taking the battery module to be tested as an retired battery module for classification, the classification is performed in a manner of reading capacity by using a database without introducing historical data, the battery module is firstly subjected to code scanning to obtain a corresponding battery code and code scanning time, then, the test is started, the open circuit voltage of a single battery with the lowest open circuit voltage in the battery is tested to be 4.02V, the discharge energy is 9.66Wh, a calculation formula y of 107.99042x-894.8394 is determined according to the open circuit voltage (the following table 2 can be inquired), the discharge energy is substituted into the formula to obtain the residual capacity y of 148.35Ah, a battery capacity grade table (see the following table 1) is inquired to obtain the capacity grade of the battery as a1, the calculation formula y of 3.726-3.69V for the residual capacity of the battery is 87.1868x-631.20656 (the following table 2 is inquired to obtain the discharge energy of x of 8.9412Wh under the open circuit voltage, the power characteristic parameter level table (see table 3 below) is queried to obtain a power level of P0 and a battery module level of A1P 0. Meanwhile, the battery code, the code scanning time and the battery module grade are listed in the grading result.
According to the technical scheme of the embodiment of the invention, the open-circuit voltage of the battery to be tested is obtained, and the first power characteristic parameter corresponding to the open-circuit voltage is determined according to the open-circuit voltage; determining residual capacity information according to the first power characteristic parameter, and determining the capacity grade of the battery to be tested corresponding to the residual capacity information from a battery capacity grade table; determining a second power characteristic parameter according to the residual capacity information, and determining the power grade of the battery to be tested in the echelon form corresponding to the second power characteristic parameter from a power characteristic parameter grade table; and determining the grading grade of the battery to be tested according to the capacity grade and the power grade. The technical scheme of the embodiment of the invention solves the problem that in the prior art, all the battery monomers contained in the echelon battery are required to be subjected to one-by-one capacity test to perform all-around tests on the echelon battery, so that a large amount of time and resources are wasted, and the echelon battery is rapidly and accurately graded.
Example two
Fig. 2A is a flowchart of a method for grading a graded battery according to a second embodiment of the present invention. The present embodiment is optimized based on the above embodiments.
Correspondingly, the method of the embodiment specifically includes:
s210, obtaining the open-circuit voltage of the echelon battery to be tested, and determining a first power characteristic parameter corresponding to the open-circuit voltage according to the open-circuit voltage.
It can be understood that if the echelon battery to be tested is the echelon battery module to be tested or the echelon battery pack to be tested, the single battery with the lowest open-circuit voltage in the echelon battery module to be tested or the echelon battery pack to be tested is obtained, and the first power characteristic parameter corresponding to the open-circuit voltage is determined according to the open-circuit voltage corresponding to the single battery with the lowest open-circuit voltage.
S220, obtaining historical residual capacity information of a plurality of historical echelon batteries, and determining historical power characteristic parameters according to the historical residual capacity information.
On the basis of the embodiment, historical residual capacity information of a plurality of historical echelon batteries is obtained, and a calibration point is set for the historical residual capacity information based on the capacity grade; and carrying out a preset multiplying power current charge-discharge cycle test based on the historical residual capacity information of each calibration point to obtain the historical power characteristic parameter under each calibration point.
And S230, constructing a battery performance full life cycle test database according to the historical residual capacity information and the historical power characteristic parameters.
For example, fig. 2B is a flowchart of a battery grading operation for a battery to be tested in a echelon manner according to an embodiment of the present invention, and fig. 2C is a flowchart of a full life cycle test database establishment according to an embodiment of the present invention. Referring to fig. 2C, the establishment of the battery performance full life cycle test database is established through a battery test, and the required test sample size is more than 11 battery cells of the battery; the test is divided into two parts, namely a cycle test part and a calibration test part, and the two parts are alternately and circularly carried out until the capacity of the battery is attenuated to 20% of the initial capacity; the cycle test part is a 1-multiplying-power current charge-discharge cycle test at 25 ℃, and one group of the cycle test part is 20-100 cycles; the calibration test part firstly sets calibration points, the calibration points are set according to a definition method the same as the capacity grades, and one calibration point is arranged at each capacity grade; in the calibration test, each time in the test process is controlledWhen the standing is finished, the temperature of the battery is 25 +/-2 ℃, and if the temperature is not in the range, the standing time needs to be prolonged; the testing method comprises the following steps that after the battery is fully charged, the battery is kept stand for 1 hour, the battery is discharged to a first calibration point by using current of 0.2-1 multiplying power, the battery is kept stand for 1 hour, the battery is discharged for 0.1-30s by using current of 2-5 multiplying power, then the battery is kept stand for 1 hour, the battery is adjusted to the next calibration point by using current of 0.2-1 multiplying power, the battery is kept stand for 1 hour, the battery is discharged for 0.1-30s by using current of 2-5 multiplying power, the cycle is repeated until the battery is discharged to a cut-off voltage, and the battery is charged and discharged for 1 cycle by using current multiplying power after the battery is kept stand for 1 hour; the test process is a group of cycle tests and then a calibration test is inserted, and the cycle is carried out until the battery capacity is attenuated to 20% of the initial capacity; the test data is processed as follows, the discharge energy or internal resistance of each time of multiplying power discharge of each sample is calculated, the mean value of the discharge energy or internal resistance of all samples under the same cycle number under each calibration point is calculated and named as pulse discharge energy or pulse discharge internal resistance, the mean value of 0.2 multiplying power discharge capacity after each time of calibration of each sample is used as the residual capacity of the calibration test, a fitting curve is made between each group of residual capacity and the pulse discharge energy or the pulse discharge internal resistance under the same calibration point, and the fitting formula is that y is y0+Ax、y＝y0+Aeax、y＝y0+A1eax+A2ebxOr y ═ y0+A1eax+A2ebx+A3ecxThis curve is named as the calculation curve; and recording the voltage before discharging of each calibration point, calculating the average value as the open-circuit voltage of the calibration point, and calculating the curve of the residual capacity-pulse discharge energy or pulse discharge internal resistance of each calibration point by using the method.
S240, determining residual capacity information according to the first power characteristic parameter, and determining the capacity grade of the battery to be tested in the echelon corresponding to the residual capacity information from a battery capacity grade table.
And S250, determining a second power characteristic parameter according to the residual capacity information, and determining the power grade of the battery to be tested in the echelon mode corresponding to the second power characteristic parameter from a power characteristic parameter grade table.
And S260, determining the grading grade of the battery to be tested according to the capacity grade and the power grade.
S270, obtaining battery information of the battery to be tested in the echelon mode, and obtaining a grading result of the battery to be tested in the echelon mode according to the battery information and the grading grade of the battery to be tested in the echelon mode.
The battery information of the battery to be tested can be the battery number of the battery to be tested or the code scanning time and other information of the battery to be tested. And the grading result of the battery to be tested in the echelon is obtained by correspondingly expressing the battery information and the grading result.
It can be understood that the grading result of the battery to be tested can be output in the form of a graph or a table.
According to the technical scheme of the embodiment of the invention, the grading of the battery to be tested is realized more quickly and accurately by the characteristic data of the battery to be tested in the full life cycle test database of the battery performance established in advance.
EXAMPLE III
The technical scheme of the embodiment of the invention is a preferred embodiment provided on the basis of the embodiment. Fig. 3A is a flowchart of a method for grading a battery in steps according to an embodiment of the present invention, and fig. 3B is a schematic diagram of components of an apparatus for grading a battery in steps according to an embodiment of the present invention. Referring to fig. 3A and 3B, the elements in fig. 3B are a 1-code scanning gun, a 2-upper computer, a 3-charge and discharge test device, and a 4-battery to be tested, respectively.
The 2-upper computer can control 3-charge and discharge test equipment, test software is installed in the 2-upper computer, the 1-code scanning gun is connected with the 2-upper computer, and coded data of a battery pack, a module or a single body can be transmitted into the test software through code scanning; the single voltage sampling range of the 3-charge and discharge test equipment is 1-10V, the voltage sampling precision is higher than the voltage range of 0.005%, the current range is higher than the pulse discharge current, and the current precision is the current range of 0.005%. The test software comprises a test control module, a data processing module and a result output module; the test control module not only has the basic function of controlling the 3-charge and discharge test equipment, but also has the function of associating the battery code to the test channel, and can load the data processing template and the result output template, so that the data processing template and the result output template are automatically called to process the data after the test control program is executed, and the grading result and other required data are directly output.
The data processing can set a series of parameters as the source of data output, wherein the parameters comprise general calculation parameters, test basic parameters, operation parameters and table parameters, and all the parameters can be stored as a template for modification and calling; the general calculation parameters comprise constants, circumferential rates and natural logarithms; the test basic parameters comprise big data read data and all data obtained by test, the data are expressed in a column form, different test result columns are read according to different battery types, and the test result columns totally comprise a test time data column, a test step data column, a step time data column, a voltage data column, a current data column, an energy data column, a temperature data column, an auxiliary channel voltage column, an auxiliary channel temperature column and single voltage, current, energy and temperature information reported by a battery management system; the operation parameter is a parameter obtained by operating the test basic parameter, and the parameter can be data of a specific position of a certain process step, can also be data of specific time of a certain process step, can be a section of data of a specific parameter of a certain process step, and can also be a section of data of specific time of a certain process step; the operation parameters also comprise operation result parameters for performing addition, subtraction, multiplication, division, power, logarithm and the like on the single parameters, column parameters for performing addition, subtraction, multiplication, division, power and logarithm operation results on corresponding data of columns and rows, and data parameters for performing maximum value taking, minimum value taking and average value taking on a plurality of single data and a column of data; the table parameters comprise a judgment parameter, a judgment range parameter and a function parameter, the judgment parameter is one of the parameters, whether the judgment parameter is within the judgment range parameter is judged, if so, the subsequent function parameter is executed, and the output result of the table is the output result of the function parameter.
The output module can output all the parameters, can output column parameters in a form of a graph or a table, and can generate an output template according to the output content and load the output template into the test control module.
For example, a battery module with 1 parallel 4 strings is taken as an example, and the battery unit to be classified is nominally 150 Ah. The classification capacity is established by setting a grade for every 5% reduction of the capacity, and the battery capacity grade table is shown in the following table 1:
TABLE 1 Battery Capacity ratings Table
Determining 300A discharge energy data of a monomer with power characteristic parameters of open-circuit voltage for 30s, formulating a database establishing method, and performing a cycle test as follows:
1. standing for 10s, and sampling for 0.1 s;
2. 150A to a charge cut-off voltage, sample time 1 s;
3. standing for 1h, and sampling for 1 s;
4. 150A is discharged to a discharge cut-off voltage, and the sampling time is 1 s;
5. standing for 1h, and sampling for 1 s;
6. the steps are circulated for 2 to 5 times for 100 times.
The calibration test method is as follows:
1. standing for 10 seconds, wherein the sampling time is 0.1 s;
2. 300A discharging for 30s, and sampling time for 0.1 s;
3. standing for 10min, and sampling for 0.1 s;
4. 30A discharging for 14.5min, and sampling time of 1s
5. Standing for 1h, and sampling for 1 s;
6. circularly operating for 2-5 steps until the battery is discharged to cut-off voltage
7. Standing for 1h, and sampling for 1 s;
8. 30A is charged to cut-off voltage, and the sampling time is 1 s;
9. standing for 1h, and sampling for 1 s;
10. discharging to cut-off voltage at 30A, and sampling for 1 s;
11. standing for 1h, and sampling for 1 s.
And carrying out a calibration test after each 100-time cycle test until the residual capacity of the battery is reduced to 30 Ah.
And performing data processing after the test is finished, wherein y is equal to y0+ Ax is fitted to the relationship between 30s discharge energy and remaining capacity to form a correspondence of open circuit voltage to the calculation formula as shown in table 2:
TABLE 2 list of calculation formulas
The discharge energy data of 2-rate discharge for 30s under the open-circuit voltage of 3.726-3.69V is used as the characteristic parameter of power rating, and a power rating distribution scheme is formulated as shown in a table 3:
TABLE 3 Power characterisation parameter rating Table
| 3.726-3.69V discharge energy (Wh) of 2-magnification discharge for 30s at open circuit voltage | Grade |
| >8.838 | P0 |
| 8.798-8.838 | P1 |
| 8.758-8.798 | P2 |
| 8.718-8.758 | P3 |
| 8.678-8.718 | P4 |
| 8.638-8.678 | P5 |
| 8.598-8.638 | P6 |
| 8.558-8.598 | P7 |
| 8.518-8.558 | P8 |
| 8.478-8.518 | P9 |
| 8.438-8.478 | P10 |
| 8.398-8.438 | P11 |
| 8.358-8.398 | P12 |
| 8.318-8.358 | P13 |
| 8.278-8.318 | P14 |
| 8.238-8.278 | P15 |
| 8.198-8.238 | P16 |
During grading, the control software program is programmed as follows:
1. standing for 10s, and sampling for 0.1 s;
2. 300A discharging for 30s, and sampling time for 0.1 s;
3. standing for 10s, and sampling for 0.1 s.
And (3) compiling a data processing template, taking the open-circuit voltage of the last data of the 10s standing in the step 1 as the open-circuit voltage data of the lookup table 2, multiplying the voltage data and the current data in the step 2 in sequence, multiplying the multiplied voltage data and the current data in sequence by 0.1 in sequence, dividing the multiplied voltage data and the multiplied current data by 3600, and summing the obtained columns to obtain a parameter, namely the 30s discharge energy parameter. And compiling a data output template, outputting a battery number, a code scanning time, a capacity grade and a power grade.
Example four
Fig. 4 is a structural diagram of a grading apparatus for a battery with multiple battery steps according to a fourth embodiment of the present invention, which is applicable to a situation where a retired battery cell, a battery module, or a battery pack is graded to use its remaining value.
As shown in fig. 4, the classification means includes: a parameter determination module 410, a capacity level determination module 420, a power level determination module 430, and a classification level determination module 440, wherein:
the parameter determining module 410 is configured to obtain an open-circuit voltage of a echelon battery to be tested, and determine a first power characteristic parameter corresponding to the open-circuit voltage according to the open-circuit voltage;
a capacity grade determining module 420, configured to determine remaining capacity information according to the first power characteristic parameter, and determine a capacity grade of the battery to be tested corresponding to the remaining capacity information from a battery capacity grade table;
a power level determining module 430, configured to determine a second power characteristic parameter according to the remaining capacity information, and determine a power level of the battery to be tested in the echelon form corresponding to the second power characteristic parameter from a power characteristic parameter level table;
and a grading grade determining module 440, configured to determine a grading grade of the battery to be tested according to the capacity grade and the power grade.
In the grading device for the echelon battery, the open-circuit voltage of the echelon battery to be tested is obtained, and a first power characteristic parameter corresponding to the open-circuit voltage is determined according to the open-circuit voltage; determining residual capacity information according to the first power characteristic parameter, and determining the capacity grade of the battery to be tested corresponding to the residual capacity information from a battery capacity grade table; determining a second power characteristic parameter according to the residual capacity information, and determining the power grade of the battery to be tested in the echelon form corresponding to the second power characteristic parameter from a power characteristic parameter grade table; and determining the grading grade of the battery to be tested according to the capacity grade and the power grade. The technical scheme of the embodiment of the invention solves the problem that in the prior art, all the battery monomers contained in the echelon battery are required to be subjected to one-by-one capacity test to perform all-around tests on the echelon battery, so that a large amount of time and resources are wasted, and the echelon battery is rapidly and accurately graded.
On the basis of the foregoing embodiments, before determining the remaining capacity information according to the first power characteristic parameter, the method further includes:
acquiring historical residual capacity information of a plurality of historical echelon batteries, and determining historical power characteristic parameters according to the historical residual capacity information;
and constructing a battery performance full life cycle test database according to the historical residual capacity information and the historical power characteristic parameters.
On the basis of the above embodiments, obtaining historical remaining capacity information of a plurality of historical echelon batteries, and determining a historical power characteristic parameter according to the historical remaining capacity information includes:
acquiring historical residual capacity information of a plurality of historical echelon batteries, and setting a calibration point for the historical residual capacity information based on the capacity grade;
and carrying out a preset multiplying power current charge-discharge cycle test based on the historical residual capacity information of each calibration point to obtain the historical power characteristic parameter under each calibration point.
On the basis of the above embodiments, the echelon battery to be tested is a echelon battery module to be tested or a echelon battery pack to be tested;
obtaining the open-circuit voltage of the echelon battery to be tested, and determining a first power characteristic parameter corresponding to the open-circuit voltage according to the open-circuit voltage, wherein the method comprises the following steps:
the method comprises the steps of obtaining a single battery with the lowest open-circuit voltage in the echelon battery module to be detected or the echelon battery pack to be detected, and determining a first power characteristic parameter corresponding to the open-circuit voltage according to the open-circuit voltage corresponding to the single battery with the lowest open-circuit voltage.
On the basis of the above embodiments, the battery capacity grade table is established by setting a capacity grade by a preset capacity threshold until the capacity is reduced to a battery initial capacity setting range;
the power characteristic parameter grade table is established by taking the power characteristic parameters of the historical echelon battery under the set open-circuit voltage as a division standard and dividing the power characteristic parameters by the same number of parts as the division of the battery capacity grade table.
On the basis of the above embodiments, the classification device further includes:
and acquiring the battery information of the battery to be tested in the echelon mode, and obtaining the grading result of the battery to be tested in the echelon mode according to the battery information and the grading grade of the battery to be tested in the echelon mode.
On the basis of the above embodiments, the grading result of the battery to be tested is output in the form of a graph or a table.
The grading device for the echelon battery provided by each embodiment can execute the grading method for the echelon battery provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects for executing the grading method for the echelon battery.
EXAMPLE five
Fig. 5 is a schematic structural diagram of a computer device according to embodiment 5 of the present invention. FIG. 5 illustrates a block diagram of an exemplary computer device 512 suitable for use in implementing embodiments of the present invention. The computer device 512 shown in FIG. 5 is only an example and should not bring any limitations to the functionality or scope of use of embodiments of the present invention.
As shown in FIG. 5, computer device 512 is in the form of a general purpose computing device. Components of computer device 512 may include, but are not limited to: one or more processors or processing units 516, a system memory 528, and a bus 518 that couples the various system components including the system memory 528 and the processing unit 516.
The system memory 528 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM)530 and/or cache memory 532. The computer device 512 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 534 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 5, and commonly referred to as a "hard drive"). Although not shown in FIG. 5, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 518 through one or more data media interfaces. Memory 528 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility 540 having a set (at least one) of program modules 542, including but not limited to an operating system, one or more application programs, other program modules, and program data, may be stored in, for example, the memory 528, each of which examples or some combination may include an implementation of a network environment. The program modules 542 generally perform the functions and/or methods of the described embodiments of the invention.
The computer device 512 may also communicate with one or more external devices 514 (e.g., keyboard, pointing device, display 524, etc.), with one or more devices that enable a user to interact with the computer device 512, and/or with any devices (e.g., network card, modem, etc.) that enable the computer device 512 to communicate with one or more other computing devices. Such communication may occur via input/output (I/O) interfaces 522. Also, computer device 512 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network such as the Internet) via network adapter 520. As shown, the network adapter 520 communicates with the other modules of the computer device 512 via the bus 518. It should be appreciated that although not shown, other hardware and/or software modules may be used in conjunction with the computer device 512, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
The processing unit 516 executes various functional applications and data processing by running a program stored in the system memory 528, for example, implementing the method for grading a battery in a battery bank according to an embodiment of the present invention, the method for grading a battery bank in a battery bank includes:
acquiring the open-circuit voltage of a echelon battery to be detected, and determining a first power characteristic parameter corresponding to the open-circuit voltage according to the open-circuit voltage;
determining residual capacity information according to the first power characteristic parameter, and determining the capacity grade of the battery to be tested corresponding to the residual capacity information from a battery capacity grade table;
determining a second power characteristic parameter according to the residual capacity information, and determining the power grade of the battery to be tested in the echelon form corresponding to the second power characteristic parameter from a power characteristic parameter grade table;
and determining the grading grade of the battery to be tested according to the capacity grade and the power grade.
Of course, those skilled in the art will understand that the processor may also implement the technical solution of the method for grading graded batteries according to any embodiment of the present invention.
EXAMPLE six
The sixth embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for grading a battery in a echelon as provided in the sixth embodiment of the present invention, where the method for grading a battery in a echelon includes:
acquiring the open-circuit voltage of a echelon battery to be detected, and determining a first power characteristic parameter corresponding to the open-circuit voltage according to the open-circuit voltage;
determining residual capacity information according to the first power characteristic parameter, and determining the capacity grade of the battery to be tested corresponding to the residual capacity information from a battery capacity grade table;
determining a second power characteristic parameter according to the residual capacity information, and determining the power grade of the battery to be tested in the echelon form corresponding to the second power characteristic parameter from a power characteristic parameter grade table;
and determining the grading grade of the battery to be tested according to the capacity grade and the power grade.
Of course, the computer-readable storage medium provided by the embodiments of the present invention, on which the computer program is stored, is not limited to the method operations described above, and may also perform related operations in the method for grading a stepped battery provided by any embodiment of the present invention.
Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A method of grading a graded battery, comprising:
acquiring the open-circuit voltage of a echelon battery to be detected, and determining a first power characteristic parameter corresponding to the open-circuit voltage according to the open-circuit voltage;
determining residual capacity information according to the first power characteristic parameter, and determining the capacity grade of the battery to be tested corresponding to the residual capacity information from a battery capacity grade table; the battery capacity grade table is established by setting a capacity grade by a preset capacity threshold until the capacity is reduced to a battery initial capacity setting range;
determining a second power characteristic parameter according to the residual capacity information, and determining the power grade of the battery to be tested in the echelon form corresponding to the second power characteristic parameter from a power characteristic parameter grade table; the power characteristic parameter grade table is established by taking the power characteristic parameters of the historical echelon battery under the set open-circuit voltage as a division standard and dividing the power characteristic parameters by the same number as the division of the battery capacity grade table;
and determining the grading grade of the battery to be tested according to the capacity grade and the power grade.
2. The method of claim 1, further comprising, prior to determining remaining capacity information based on the first power characterization parameter:
acquiring historical residual capacity information of a plurality of historical echelon batteries, and determining historical power characteristic parameters according to the historical residual capacity information;
and constructing a battery performance full life cycle test database according to the historical residual capacity information and the historical power characteristic parameters.
3. The method of claim 2, wherein obtaining historical remaining capacity information for a plurality of historical echelon batteries and determining a historical power characteristic parameter from the historical remaining capacity information comprises:
acquiring historical residual capacity information of a plurality of historical echelon batteries, and setting a calibration point for the historical residual capacity information based on the capacity grade;
and carrying out a preset multiplying power current charge-discharge cycle test based on the historical residual capacity information of each calibration point to obtain the historical power characteristic parameter under each calibration point.
4. The method according to claim 3, wherein the battery to be tested is a battery module to be tested or a battery pack to be tested;
obtaining the open-circuit voltage of the echelon battery to be tested, and determining a first power characteristic parameter corresponding to the open-circuit voltage according to the open-circuit voltage, wherein the method comprises the following steps:
the method comprises the steps of obtaining a single battery with the lowest open-circuit voltage in the echelon battery module to be detected or the echelon battery pack to be detected, and determining a first power characteristic parameter corresponding to the open-circuit voltage according to the open-circuit voltage corresponding to the single battery with the lowest open-circuit voltage.
5. The method of claim 1, further comprising:
and acquiring the battery information of the battery to be tested in the echelon mode, and obtaining the grading result of the battery to be tested in the echelon mode according to the battery information and the grading grade of the battery to be tested in the echelon mode.
6. The method as claimed in claim 5, wherein the grading result of the battery to be tested is outputted in the form of a graph or a table.
7. A grading apparatus for graded batteries, comprising:
the parameter determination module is used for acquiring the open-circuit voltage of the battery to be tested in the echelon mode and determining a first power characteristic parameter corresponding to the open-circuit voltage according to the open-circuit voltage;
the capacity grade determining module is used for determining residual capacity information according to the first power characteristic parameter and determining the capacity grade of the battery to be tested corresponding to the residual capacity information from a battery capacity grade table; the battery capacity grade table is established by setting a capacity grade by a preset capacity threshold until the capacity is reduced to a battery initial capacity setting range;
the power grade determining module is used for determining a second power characteristic parameter according to the residual capacity information and determining the power grade of the battery to be tested corresponding to the second power characteristic parameter from a power characteristic parameter grade table; the power characteristic parameter grade table is established by taking the power characteristic parameters of the historical echelon battery under the set open-circuit voltage as a division standard and dividing the power characteristic parameters by the same number as the division of the battery capacity grade table;
and the grading grade determining module is used for determining the grading grade of the battery to be tested according to the capacity grade and the power grade.
8. A computer device, characterized in that the computer device comprises:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the method of grading a graded battery according to any of claims 1-6.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method of grading a graded battery according to any of claims 1-6.
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| CN114935720A (en) * | 2022-02-18 | 2022-08-23 | 中国第一汽车股份有限公司 | Vehicle-mounted power performance verification method, system, terminal and storage medium for power battery |
| CN115421046B (en) * | 2022-09-16 | 2023-11-03 | 广东邦普循环科技有限公司 | Gradient utilization screening method, device and equipment for power battery and storage medium |
| CN117609846A (en) * | 2024-01-23 | 2024-02-27 | 宁德时代新能源科技股份有限公司 | Battery performance parameter acquisition method and device, electronic equipment and storage medium |
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| CN103439665B (en) * | 2013-08-30 | 2016-02-03 | 长城汽车股份有限公司 | The analytical approach that electrokinetic cell echelon utilizes |
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