CN114895204A - Method and device for testing battery parameters, medium and equipment for charging and discharging test - Google Patents

Method and device for testing battery parameters, medium and equipment for charging and discharging test Download PDF

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Publication number
CN114895204A
CN114895204A CN202210600727.8A CN202210600727A CN114895204A CN 114895204 A CN114895204 A CN 114895204A CN 202210600727 A CN202210600727 A CN 202210600727A CN 114895204 A CN114895204 A CN 114895204A
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battery
testing
tested
internal resistance
value
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不公告发明人
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Hainan Little Shark Water New Energy Technology Co Ltd
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Hainan Little Shark Water New Energy Technology Co Ltd
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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
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

The embodiment of the application provides a method, a device, a medium and equipment for testing battery parameters, wherein the method comprises the following steps: after the battery to be tested is charged to the upper limit voltage and then discharged to the lower limit voltage for N times, testing the attenuation capacity value of the battery to be tested, wherein N is an integer greater than or equal to 1; after the battery to be tested is charged for M times again to the upper limit voltage and then discharged within the preset time, testing the dynamic internal resistance value of the battery to be tested, wherein M is an integer greater than or equal to 1; and repeating the steps of testing the attenuation capacity value and testing the dynamic internal resistance value until the battery to be tested reaches the service life end, and obtaining a plurality of groups of battery parameters corresponding to the repetition times, wherein one group of battery parameters comprises an attenuation capacity value and a dynamic internal resistance value. According to the method and the device, the automatic test of the service life of the battery can be realized, so that the attenuation trend of the battery in the cycle test process can be visually represented.

Description

Method and device for testing battery parameters, medium and equipment for charging and discharging test
Technical Field
The embodiment of the application relates to the field of battery testing, in particular to a method and a device for testing battery parameters, a medium and equipment for testing charge and discharge.
Background
In the related art, a lithium battery is a relatively common power supply mode. In the process of performing performance test on the lithium battery, the related art generally compares data before cycle test with data after cycle test, that is, manually stops detection after cycle preset turns to obtain battery parameters. However, this method results in the need for human intervention during the testing process, resulting in a reduction in testing efficiency.
Therefore, how to improve the testing efficiency of the battery to be tested becomes a problem to be solved.
Disclosure of Invention
The embodiment of the application provides a method and a device for testing battery parameters, a medium and equipment for testing charge and discharge, and the test efficiency of a battery to be tested can be at least improved through some embodiments of the application.
In a first aspect, an embodiment of the present application provides a method for testing battery parameters, where the method includes: the method comprises the steps of testing the attenuation capacity value of a battery to be tested after N times of operations of charging the battery to be tested to an upper limit voltage and then discharging the battery to a lower limit voltage, wherein N is an integer greater than or equal to 1; after the battery to be tested is charged for M times again to the upper limit voltage and then discharged within a preset time, testing the dynamic internal resistance value of the battery to be tested, wherein M is an integer greater than or equal to 1; and repeating the steps of testing the attenuation capacity value and testing the dynamic internal resistance value until the battery to be tested reaches the service life end, and obtaining a plurality of groups of battery parameters corresponding to the repetition times, wherein one group of battery parameters comprises an attenuation capacity value and a dynamic internal resistance value.
Therefore, in the embodiment of the application, through the cycle test of automatic jump, the aim of multi-parameter test can be achieved without human intervention, so that the test data can be more visual, and the data analysis is convenient.
With reference to the first aspect, in an embodiment of the present application, after the testing the dynamic internal resistance value of the battery to be tested after the operation of discharging within a preset time after the battery to be tested is charged to the upper limit voltage M times again, the method further includes: after K times of charging to the upper limit voltage and then discharging to the lower limit voltage are carried out on the battery to be tested, testing the multiplying power discharge performance value of the battery to be tested, wherein K is an integer greater than or equal to 1; repeating the steps of testing the attenuation capacity value and testing the dynamic internal resistance value until the battery to be tested reaches the end of service life, and obtaining a plurality of groups of battery parameters corresponding to the repetition times, wherein the steps comprise: repeating the steps of testing the attenuation capacity value, testing the dynamic internal resistance value and testing the rate discharge performance value until the battery to be tested reaches the end of service life, and obtaining a plurality of groups of battery parameters corresponding to the repetition times, wherein one group of battery parameters comprises an attenuation capacity value, a dynamic internal resistance value and a rate discharge performance value.
Therefore, the embodiment of the application can connect the sub-steps of testing each parameter through the steps of testing the attenuation capacity value, testing the dynamic internal resistance value and testing the rate discharge performance value, so that the automatic testing of the battery parameters to be tested is realized, manual intervention is not needed, and the detection efficiency is improved.
With reference to the first aspect, in an embodiment of the present application, after the testing the dynamic internal resistance value of the battery to be tested after the operation of discharging within a preset time after the battery to be tested is charged to the upper limit voltage M times again, the method further includes: after the battery to be tested is subjected to operations of discharging to the upper limit voltage and then charging to the lower limit voltage for K times, testing the multiplying power charging performance value of the battery to be tested; repeating the steps of testing the attenuation capacity value and testing the dynamic internal resistance value until the battery to be tested reaches the end of service life, and obtaining a plurality of groups of battery parameters corresponding to the repetition times, wherein the steps comprise: repeating the steps of testing the attenuation capacity value, testing the dynamic internal resistance value and testing the rate charging performance value until the battery to be tested reaches the end of the service life, and obtaining a plurality of groups of battery parameters corresponding to the repetition times, wherein one group of battery parameters comprises an attenuation capacity value, a dynamic internal resistance value and a rate charging performance value.
Therefore, the embodiment of the application can connect the sub-steps of testing each parameter through the steps of testing the attenuation capacity value, testing the dynamic internal resistance value and testing the rate charging performance value, so that the automatic testing of the parameters of the battery to be tested is realized, manual intervention is not needed, and the detection efficiency is improved.
With reference to the first aspect, in one embodiment of the present application, after obtaining the plurality of sets of battery parameters corresponding to the number of repetitions, the method further includes: and obtaining the performance loss trend of the battery to be tested according to the plurality of groups of battery parameters.
Therefore, the embodiment of the application represents the obtained multiple groups of battery parameters through the performance loss trend, and can visually observe the change rule of each battery parameter in the process of the battery loss to be tested.
In a second aspect, an embodiment of the present application provides a device for testing battery parameters, where the device includes: the testing method comprises the steps that a first testing module is configured to test the attenuation capacity value of a battery to be tested after the battery to be tested is charged to an upper limit voltage and then discharged to a lower limit voltage for N times, wherein N is an integer greater than or equal to 1; the second testing module is configured to test the dynamic internal resistance value of the battery to be tested after the battery to be tested is charged for M times again to the upper limit voltage and then discharged within a preset time, wherein M is an integer greater than or equal to 1; and the cycle testing module is configured to repeat the steps of testing the attenuation capacity value and testing the dynamic internal resistance value until the battery to be tested reaches the service life end, and obtain a plurality of groups of battery parameters corresponding to the repetition times, wherein one group of battery parameters comprises an attenuation capacity value and a dynamic internal resistance value.
In combination with the second aspect, in an embodiment of the present application, the second testing module is further configured to: after the battery to be tested is charged to the upper limit voltage and then discharged to the lower limit voltage for K times, testing the multiplying power discharge performance value of the battery to be tested; the loop test module is further configured to: repeating the steps of testing the attenuation capacity value, testing the dynamic internal resistance value and testing the rate discharge performance value until the battery to be tested reaches the end of service life, and obtaining a plurality of groups of battery parameters corresponding to the repetition times, wherein one group of battery parameters comprises an attenuation capacity value, a dynamic internal resistance value and a rate discharge performance value.
With reference to the second aspect, in one embodiment of the present application, the second testing module is further configured to: after the battery to be tested is subjected to operations of discharging to the upper limit voltage and then charging to the lower limit voltage for K times, testing the multiplying power charging performance value of the battery to be tested; the loop test module is further configured to: repeating the steps of testing the attenuation capacity value, testing the dynamic internal resistance value and testing the rate charging performance value until the battery to be tested reaches the end of the service life, and obtaining a plurality of groups of battery parameters corresponding to the repetition times, wherein one group of battery parameters comprises an attenuation capacity value, a dynamic internal resistance value and a rate charging performance value.
In a third aspect, an embodiment of the present application provides a device for charge and discharge testing, where the device is configured to perform the method for testing parameters of a battery according to any embodiment of the first aspect.
In a fourth aspect, an embodiment of the present application provides an electronic device, including: a processor, a memory, and a bus; the processor is connected to the memory via the bus, and the memory stores computer readable instructions for implementing the method according to any of the embodiments of the first aspect when the computer readable instructions are executed by the processor.
In a fifth aspect, the present application provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed to implement the method according to any embodiment of the first aspect.
Drawings
Fig. 1 is a schematic diagram illustrating a system for testing battery parameters according to an embodiment of the present disclosure;
fig. 2 is a flowchart illustrating a method for testing battery parameters according to an embodiment of the present disclosure;
FIG. 3 is a graph illustrating a wear trend according to an embodiment of the present application;
FIG. 4 is a block diagram of a device for testing battery parameters according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of an electronic device shown in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all 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, as presented in the figures, 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.
The embodiment of the application can be applied to testing the battery parameters of the battery to be tested (such as a lithium ion battery) and obtaining the scene of the performance loss trend of the battery to be tested. In order to solve the problems in the background art, in some embodiments of the present application, a performance loss trend graph of a battery to be tested is obtained by testing parameters such as an attenuation capacity value and a dynamic internal resistance value of the battery to be tested in a charge-discharge cycle, so that waste of human resources is reduced, and testing efficiency is improved.
It should be noted that the kind of the battery is not limited in the embodiment of the present application. Specifically, the battery to be tested can be a lithium ion battery, a nickel cadmium battery, a nickel hydrogen battery, a lead-acid battery, and the like.
The method steps in the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 provides a schematic diagram of a system for testing battery parameters in some embodiments of the present application, which includes a battery to be tested 110, a device for charge and discharge testing 120, and a display terminal 130. Specifically, the battery 110 to be tested is electrically connected to the device 120 for charge and discharge testing, and the device 120 for charge and discharge testing controls the battery 110 to be tested to perform charge and discharge operations. The device 120 for charge and discharge test obtains multiple sets of battery parameters and plots the multiple sets of battery parameters into a performance loss trend graph in the process of controlling the charge and discharge of the battery 110 to be tested, and sends the graph to the display terminal 130. The display terminal 130 displays the performance loss trend graph of the battery to be tested after obtaining the performance loss trend graph.
Different from the embodiment of the application, in the related art, data before the cycle test is compared with data after the cycle test, that is, detection is manually stopped after the cycle preset number of cycles, battery parameters are obtained, manual participation is needed in the test process, and therefore test efficiency is reduced. The method combines the processes of testing the parameters of the batteries into a coherent flow, so that the embodiment of the method does not need to stop the detection after testing one battery parameter and then start the battery to obtain a plurality of groups of battery parameters of the batteries to be tested when detecting another battery parameter like the related technology.
The following test methods for battery parameters provided in some embodiments of the present application take a device for charge and discharge test as an exemplary parameter. It can be understood that the test method of the embodiment of the present application can be applied to any device capable of controlling the battery to be tested to perform the charging and discharging operation and obtaining the charging and discharging test of the battery parameters.
It should be noted that, in the process of testing the battery parameters, the cycle life of the battery to be tested, the internal resistance change and the rate change during the cycle are usually tested under a constant temperature environment (for example, 10 ℃, 25 ℃, 45 ℃ and the like). In the related art, battery life (test by sustained discharge), dynamic internal resistance (obtained by dividing a voltage difference before and after discharge by a discharge current), battery rate characteristics, temperature variation, and the like can be realized.
The dynamic internal resistance represents the internal resistance of the battery to be tested at a certain time (for example, before the cycle, after the cycle for N times or after the cycle is finished) and at a certain fixed battery capacity (SOC). The rate performance index can reflect the charge and discharge performance of the battery to be tested, and the rate performance comprises rate charge performance and rate discharge performance. The temperature change is that the battery to be tested has certain temperature change in the charge-discharge cycle process, and simultaneously the internal resistance of the battery to be tested is increased along with the attenuation of the capacity of the battery to be tested, and the temperature of the battery is increased along with the increase of the internal resistance. It can be understood that the temperature point intercepted by the application refers to the temperature of the battery to be tested after the discharge is finished.
The types of the multiple sets of battery parameters mentioned in the embodiments of the present application include: dynamic internal resistance changes, rate characteristic changes, temperature characteristic changes, and attenuation capacity changes. Different from the prior art, the method does not need to test only one of the types independently, and all the battery parameters can be obtained in the testing process through editing the testing process.
At least to solve the problems in the background art, as shown in fig. 2, some embodiments of the present application provide a method for testing battery parameters, the method including:
s210, after the battery to be tested is charged to the upper limit voltage and then discharged to the lower limit voltage for N times, the attenuation capacity value of the battery to be tested is tested.
Specifically, the process of testing the attenuation capacity value of the battery to be tested in S210 includes:
the method comprises the following steps: and standing the battery to be tested for a preset time to ensure that the battery to be tested mainly adapts to the ambient temperature, and accessing a temperature acquisition line to acquire the temperature in the whole process.
That is, a temperature line is pasted on the battery to be tested, and left to stand for 20 minutes (i.e., a preset time). And collecting the discharged temperature in the test process to obtain a plurality of temperature values. And then drawing a plurality of temperature values into a temperature curve chart so that related personnel can judge the battery performance by analyzing the temperature curve chart.
Step two: and charging the battery to be tested to the upper limit voltage at a constant current and a constant voltage of a preset current, and standing for 10-30 min.
Namely, after the battery to be tested adapts to the ambient temperature in the step one, the battery to be tested is charged to the upper limit voltage of the battery to be tested at constant current and constant voltage by using the preset current and the preset voltage. And then, standing the battery to be tested for 10-30min to ensure the stability of the battery to be tested.
It should be noted that the upper and lower limit voltages of the battery to be tested depend on the electrochemical system and the type of the battery to be tested, and different lithium batteries have different charging and discharging currents and the upper and lower limit voltages that can be borne. For example: the upper limit voltage of the lithium iron phosphate battery is 3.6V, and the lower limit voltage of the lithium iron phosphate battery is 2.5V; the upper limit voltage of the lithium titanate battery is 2.8V, and the lower limit voltage is 1.5V.
It will be understood that the upper and lower limits of the voltage and current capacity of the battery to be tested are determined by the maximum upper and lower limits and maximum current capacity of the battery specified by the battery manufacturer, respectively. In addition, the charging and discharging current and voltage (namely the preset current and the preset voltage) which can be accepted by the battery to be tested are defined according to the product specification of the battery core manufacturer.
Step three: discharging the battery to be tested to the lower limit voltage at a preset current, and standing for 10-30 min.
That is, the battery to be tested is charged to the upper limit voltage in the step two, and after standing, the battery to be tested is discharged to the lower limit voltage at a preset current (e.g., 5A), and is left standing for 10-30min to ensure the stability of the battery to be tested.
Step four: and (5) circulating the steps from the first step to the third step for N times, and then testing the attenuation capacity value of the battery to be tested.
It should be noted that, during the cycle, the cells to be tested have a decay trend, which is mostly not linear, and in general, the highest capacity in the previous 10 cycles is used as a denominator and is denoted as Y, the capacity after the nth cycle is used as a numerator and is denoted as X, and the retention rate at the cycle number is recorded as Z (percentage), and then Z is X/Y100. Then, the decay capacity value of the battery to be tested is 100% -Z.
That is, the highest capacity in the previous 10 cycles is recorded, after which the battery to be tested is charged and discharged N times, after which a damping capacity value is calculated.
It is understood that N times may be 100 times, and may also be 200 times. The present application is not limited thereto.
And S220, after the battery to be tested is charged for M times again to the upper limit voltage and then is discharged within the preset time, testing the dynamic internal resistance value of the battery to be tested.
It should be noted that, unlike the related art, in the process of calculating the dynamic internal resistance value, the related art needs to stop cycling after cycling for a predetermined number of times, and then calibrate the capacity of the battery. In the present application, the dynamic internal resistance value is calculated for the case where the calculation is performed at the maximum capacity (100% SOC) of the battery.
That is, in the embodiment of the present application, after the battery to be tested reaches 100% SOC and stands still for 10-30min, the maximum current I specified by the battery to be tested is used max Discharging for 10-30 s, and selecting the voltage V before discharging 1 Voltage V of the last second of discharge 2 Use (V) 1 -V 2 )/I max A dynamic internal resistance value R is obtained. The dynamic internal resistance value R can be tested when the charge and discharge cycles are carried out for 0 time, 100 times, 200 times and 300 times, and the rest can be carried out until the service life of the battery is finished.
Specifically, the process of testing the dynamic internal resistance value of the battery to be tested in S220 includes:
the method comprises the following steps: and charging the battery to be tested to the upper limit voltage at a constant current and a constant voltage of a preset current, and standing for 10-30 min.
That is, the battery to be tested is charged to the upper limit voltage of the battery to be tested at a constant current and a constant voltage with a preset current and a preset voltage. And then, standing the battery to be tested for 10-30min to ensure the stability of the battery to be tested.
It should be noted that, please refer to the description in step two in S210 for the preset current, the preset voltage, and the upper limit voltage of the battery to be tested, which is not described herein again.
Step two: and (3) carrying out short-term pulse discharge on the battery to be tested for preset time at the maximum current, and standing for 10-30 min.
That is, first, after the battery to be tested is charged to the upper limit voltage (at this time, the battery capacity of the battery to be tested is 100% SOC), the voltage V before discharge is acquired 1 . Then, using the current I max And discharging the battery to be tested for 10-30 s (namely, the preset time).
Step three: and (5) circulating the steps from the first step to the second step for M times, and testing the dynamic internal resistance value of the battery to be tested after the Mth cycle.
That is, after the Mth time of the charge-discharge cycle, the voltage V of the last second of discharge is acquired 2 . Finally, use (V) 1 -V 2 )/I max Obtaining dynamic internal resistance value R, and standing for 10-30 min.
It is understood that M times may be 100 times, and may also be 200 times. The present application is not limited thereto.
In one embodiment of the present application, after S220, the method further includes testing a rate performance value of the battery to be tested, where the rate performance value includes a rate discharge performance value and a rate charge performance value, and one of the rate discharge performance value and the rate charge performance value can be selected for testing in one cycle test. For example, in a primary battery parameter test, the types of battery parameters tested are: the attenuation capacity value, the dynamic internal resistance value and the rate discharge performance value, or in another battery parameter test, the types of the tested battery parameters are as follows: attenuation capacity value, dynamic internal resistance value and rate charging performance value.
In the rate performance, the rate is a current, and the current is a rate by default, because the current is a multiple of the battery capacity. For example, the battery to be tested has a capacity of 5Ah, a 1C magnification of 5A, a 2C magnification of 10A, and a 3C magnification of 15A, and so on. The test limit of the rate capability described in the examples of the present application is > 1C. The magnitude of the charging and discharging current is limited by the maximum continuous current value specified by a battery core manufacturer.
As a specific embodiment of the present application, after S220, the method includes: and after the battery to be tested is charged to the upper limit voltage and then discharged to the lower limit voltage for K times, testing the multiplying power discharge performance value of the battery to be tested.
Specifically, the process for testing the rate discharge performance value of the battery to be tested comprises the following steps:
the method comprises the following steps: and charging the battery to be tested to the upper limit voltage at a constant current and a constant voltage of a preset current, and standing for 10-30 min.
That is, the battery to be tested is charged to the upper limit voltage of the battery to be tested, for example, at a constant current and a constant voltage at a preset current and a preset voltage. And then, standing the battery to be tested for 10-30min to ensure the stability of the battery to be tested.
Step two: and discharging the battery to be tested to the lower limit voltage at a constant current multiplying power at a current larger than 1C, and standing for 10-30 min.
Step three: and (5) cycling the steps from the first step to the second step for K times, and testing the multiplying power discharge performance value of the battery to be tested after the K time of the charge-discharge cycle.
It should be noted that the internal resistance of the battery to be tested is continuously increased during the circulation process, the charging and discharging temperature is gradually increased, and the rate capability of the battery is gradually decreased.
That is, after the battery to be tested is charged and discharged K times (for example, 100 times), the rate discharge performance value of the battery to be tested is calculated. The calculation method of the rate discharge performance value comprises the following steps: after each 100 cycles, a multiplying factor test is carried out, the value obtained by each multiplying factor test is recorded as E, the multiplying factor test retention rate is recorded as F, and F (percentage) is E/Y100.
Therefore, the embodiment of the application can connect the sub-steps of testing each parameter through the steps of testing the attenuation capacity value, testing the dynamic internal resistance value and testing the rate discharge performance value, so that the automatic testing of the battery parameters to be tested is realized, manual intervention is not needed, and the detection efficiency is improved.
As another specific embodiment of the present application, after S220, the method includes: and after the battery to be tested is subjected to the operation of discharging to the upper limit voltage and then charging to the lower limit voltage for K times, testing the multiplying power charging performance value of the battery to be tested.
Specifically, the process for testing the rate charging performance value of the battery to be tested comprises the following steps:
the method comprises the following steps: discharging the battery to be tested to the upper limit voltage at a constant current and a constant voltage of a preset current, and standing for 10-30 min.
Namely, the battery to be tested is discharged to the lower limit voltage of the battery to be tested at constant current and constant voltage with preset current and preset voltage. And then, standing the battery to be tested for 10-30min to ensure the stability of the battery to be tested.
It should be noted that, please refer to the description in step two in S210 for the preset current, the preset voltage, and the lower limit voltage of the battery to be tested, which is not described herein again.
Step two: and charging the battery to be tested to the upper limit voltage at a constant current multiplying power at a current larger than 1C, and standing for 10-30 min.
Step three: and (5) cycling the steps from the first step to the second step for K times, and testing the multiplying power charging performance value of the battery to be tested after the K time of the charging and discharging cycle.
It is understood that the calculation method of the rate charging performance value is the same as the description in step three of the previous embodiment, and is not repeated here.
That is, after the battery to be tested is charged and discharged K times (e.g., 200 times), the rate charge performance value of the battery to be tested is calculated.
Therefore, the embodiment of the application can connect the sub-steps of testing each parameter through the steps of testing the attenuation capacity value, testing the dynamic internal resistance value and testing the rate charging performance value, so that the automatic testing of the parameters of the battery to be tested is realized, manual intervention is not needed, and the detection efficiency is improved.
It should be noted that, in the embodiment of the present application, the tests of all the battery parameters included in S210 and S220 are continuously performed without manual intervention.
And S230, whether the battery to be tested reaches the end of service life or not is tested.
That is, after the charge and discharge cycles in S210 and S220, it is necessary to determine whether the battery to be tested reaches the end of life. If the battery to be tested reaches the end of life, the charge and discharge cycle is terminated, and then S240 is executed. If the battery to be tested does not reach the end of life, S210 and S220 are continuously executed, so that the test of each battery parameter is continuously performed.
It is understood that the lifetime of the battery to be tested is indicative of the capacity fade of the battery, and refers to the percentage of the battery capacity after charging and discharging for a certain number of cycles to the initial capacity (for example, after 1000 cycles of charging and discharging, the battery capacity at this time is 90% of the initial capacity). The end of life of a typical battery is defined as 80% of the initial capacity by default, wherein the end of life of the lithium ion battery is reached after 600-.
In the embodiment of the present application, the steps of testing the attenuation capacity value, the dynamic internal resistance value and the rate performance value are short-term internal cycles, i.e., testing the battery parameters within 50, 100 or 200 predetermined cycles. If the battery to be tested does not reach the end of its life, the steps of S210 and S220 are continued to be called an external loop, for example, after 1000 external loops, 1000 sets of battery parameters are obtained, wherein one set of battery parameters includes a decaying capacity value, a dynamic internal resistance value and a rate discharge performance value, or one set of battery parameters includes a decaying capacity value, a dynamic internal resistance value and a rate charge performance value.
The short-term internal circulation is used for calibrating the attenuation capacity value, the dynamic internal resistance value and the rate performance value (including the rate charging performance value and the rate discharging performance value) under a certain cycle number, and is in direct proportion to the overall attenuation trend of the battery to be tested. The external cycle is to obtain multiple sets of cell parameters during the decay of the cell being tested.
And S240, obtaining a plurality of groups of battery parameters corresponding to the repetition times.
That is, in the case where it is determined that the battery to be tested reaches the end of life, a plurality of sets of battery parameters calculated in a plurality of cycles are acquired. For example, the battery to be tested reaches the end of life after performing the S210 and S220 cycles 2000 times. Thereafter 2000 sets of cell parameters corresponding to 2000 cycles were obtained.
As an embodiment of the present application, a cycle life test may be performed on a battery to be tested, specifically, the battery to be tested is first charged with a constant current and a constant voltage to an upper limit voltage (where the upper limit voltage depends on a specified value of a manufacturer of the battery to be tested), and then left standing for 10-30 min. Then, a constant current is discharged to a lower limit voltage. Then, the above process is repeated until the capacity of the battery to be tested decays to 80% of the initial capacity (the battery capacity of the third cycle of the charge-discharge cycle is taken as the initial capacity of the battery to be tested), and the battery to be tested is considered to be invalid. The charge/discharge current is limited to a continuous charge/discharge current value specified by a battery manufacturer, for example, 5A.
It should be noted that, in the embodiment of the present application, a short-term internal loop and an external loop are combined to perform a nested loop, so that manual intervention can be reduced, and detection efficiency can be improved. In addition, the multiplying power charging test in the scheme of the application refers to constant-current multiplying power charging.
Therefore, the embodiment of the application is an automatic test scheme of the battery to be tested, manual intervention is not needed after the flow is determined, the parameters of each battery are separately tested, and the attenuation trend of the battery to be tested in the circulating process can be visually represented. The internal resistance change and the rate characteristic change of the battery to be tested under the condition of 100% SOC are tested, and the internal resistance change and the rate characteristic change are used for representing the characteristic change trend of the battery to be tested in the practical application process, so that a reliable basis can be provided for the performance analysis of the battery to be tested.
In the related technology, if the internal resistance and the multiplying power change condition of the battery to be tested in the circulation process need to be tested, the service life test needs to be stopped under a certain number of turns, the SOC is calibrated respectively, and the dynamic internal resistance test and the multiplying power performance test under the required SOC are carried out. And after the test is finished, the process is repeated for a certain number of cycles, and the operation is repeated. In contrast, the embodiments of the present application perform dynamic testing of pulses with limited 100% SOC (without calibration of SOC). And after the dynamic internal resistance is measured, charging or discharging is carried out, and preparation is made for multiplying power charging and discharging test. The process may cycle until the battery fails after the determination. No human intervention is necessary.
In one embodiment of the present application, after S240, a performance loss trend of the battery to be tested is obtained according to the plurality of sets of battery parameters. Specifically, the coordinate axes of different colors or different labeling types in the performance loss trend graph are used for representing different battery parameters, for example, as shown in fig. 3, a trend graph of a 1C cycle process, a battery dynamic internal resistance, a battery temperature and a battery 5C rate discharge performance in a 45 ℃ environment can be visually observed in the loss trend graph. The abscissa is the number of cycles, the ordinate 301 is the inner resistance value ordinate, the ordinate 302 is the temperature value ordinate, the ordinate 303 is the 5C magnification discharge retention rate ordinate, the ordinate 304 is the 1C cycle retention rate ordinate, the curve 305 is the temperature trend curve, the curve 306 is the inner resistance trend curve, the curve 307 is the 5C magnification discharge retention rate curve, and the curve 308 is the 1C cycle retention rate curve.
It can be understood that, in the circulation process obtained by observing the loss trend graph, the internal resistance of the battery to be tested is continuously increased, the charging and discharging temperature is gradually increased, and the multiplying power performance of the battery to be tested is gradually reduced.
Therefore, in the embodiment of the application, through the cycle test of automatic jump, the aim of multi-parameter test can be achieved without human intervention, so that the test data can be more visual, and the data analysis is convenient.
The above describes a method for testing battery parameters in the embodiments of the present application, and the following describes a device for testing battery parameters in the embodiments of the present application.
As shown in fig. 4, a battery parameter testing apparatus 300 includes: a first test module 310, a second test module 320, and a loop test module 330.
In an implementation manner of the present application, an embodiment of the present application provides a device 300 for testing parameters of a battery, the device including: the first testing module 310 is configured to test a decaying capacity value of a battery to be tested after the battery to be tested is charged to an upper limit voltage and then discharged to a lower limit voltage for N times, wherein N is an integer greater than or equal to 1; the second testing module 320 is configured to test a dynamic internal resistance value of the battery to be tested after the battery to be tested is discharged within a preset time after being charged to the upper limit voltage again for M times, wherein M is an integer greater than or equal to 1; the cycling test module 330 is configured to repeat the above steps of testing the attenuation capacity value and testing the dynamic internal resistance value until the battery to be tested reaches the end of the life, and obtain a plurality of sets of battery parameters corresponding to the number of repetitions, where a set of battery parameters includes an attenuation capacity value and a dynamic internal resistance value.
In one embodiment of the present application, the second testing module 320 is further configured to: after the battery to be tested is charged to the upper limit voltage and then discharged to the lower limit voltage for K times, testing the multiplying power discharge performance value of the battery to be tested; the loop test module 330 is further configured to: repeating the steps of testing the attenuation capacity value, testing the dynamic internal resistance value and testing the rate discharge performance value until the battery to be tested reaches the end of service life, and obtaining a plurality of groups of battery parameters corresponding to the repetition times, wherein one group of battery parameters comprises an attenuation capacity value, a dynamic internal resistance value and a rate discharge performance value.
In one embodiment of the present application, the second testing module 320 is further configured to: after the battery to be tested is subjected to operations of discharging to the upper limit voltage and then charging to the lower limit voltage for K times, testing the multiplying power charging performance value of the battery to be tested; the loop test module 330 is further configured to: repeating the steps of testing the attenuation capacity value, testing the dynamic internal resistance value and testing the rate charging performance value until the battery to be tested reaches the end of the service life, and obtaining a plurality of groups of battery parameters corresponding to the repetition times, wherein one group of battery parameters comprises an attenuation capacity value, a dynamic internal resistance value and a rate charging performance value.
In the embodiment of the present application, the module shown in fig. 4 can implement each process in the method embodiments of fig. 1, fig. 2, and fig. 3. The operations and/or functions of the respective modules in fig. 4 are respectively for implementing the corresponding flows in the method embodiments in fig. 1, 2 and 3. Reference may be made specifically to the description of the above method embodiments, and a detailed description is appropriately omitted herein to avoid redundancy.
As shown in fig. 5, an embodiment of the present application provides an electronic device 400, including: a processor 410, a memory 420 and a bus 430, wherein the processor is connected to the memory through the bus, the memory stores computer readable instructions, when the computer readable instructions are executed by the processor, for implementing the method according to any one of the above embodiments, specifically, the description of the above method embodiments can be referred to, and the detailed description is omitted here to avoid repetition.
Wherein the bus is used for realizing direct connection communication of the components. The processor in the embodiment of the present application may be an integrated circuit chip having signal processing capability. The Processor may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The Memory may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read Only Memory (PROM), an Erasable Read Only Memory (EPROM), an electrically Erasable Read Only Memory (EEPROM), and the like. The memory stores computer readable instructions that, when executed by the processor, perform the methods described in the embodiments above.
It will be appreciated that the configuration shown in fig. 5 is merely illustrative and may include more or fewer components than shown in fig. 5 or have a different configuration than shown in fig. 5. The components shown in fig. 5 may be implemented in hardware, software, or a combination thereof.
Embodiments of the present application further provide 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 server, the method in any of the above-mentioned all embodiments is implemented, which may specifically refer to the description in the above-mentioned method embodiments, and in order to avoid repetition, detailed description is appropriately omitted here.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
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. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A method for testing battery parameters, the method comprising:
the method comprises the steps of testing the attenuation capacity value of a battery to be tested after N times of operations of charging the battery to be tested to an upper limit voltage and then discharging the battery to a lower limit voltage, wherein N is an integer greater than or equal to 1;
after the battery to be tested is charged for M times again to the upper limit voltage and then discharged within a preset time, testing the dynamic internal resistance value of the battery to be tested, wherein M is an integer greater than or equal to 1;
and repeating the steps of testing the attenuation capacity value and testing the dynamic internal resistance value until the battery to be tested reaches the service life end, and obtaining a plurality of groups of battery parameters corresponding to the repetition times, wherein one group of battery parameters comprises an attenuation capacity value and a dynamic internal resistance value.
2. The method as claimed in claim 1, wherein after the testing of the dynamic internal resistance value of the battery to be tested after the operation of discharging within a preset time after the battery to be tested is charged to the upper limit voltage M times again, the method further comprises:
after the battery to be tested is charged to the upper limit voltage and then discharged to the lower limit voltage for K times, testing the multiplying power discharge performance value of the battery to be tested, wherein K is an integer greater than or equal to 1;
repeating the steps of testing the attenuation capacity value and testing the dynamic internal resistance value until the battery to be tested reaches the end of service life, and obtaining a plurality of groups of battery parameters corresponding to the repetition times, wherein the steps comprise:
repeating the steps of testing the attenuation capacity value, testing the dynamic internal resistance value and testing the rate discharge performance value until the battery to be tested reaches the end of service life, and obtaining a plurality of groups of battery parameters corresponding to the repetition times, wherein one group of battery parameters comprises an attenuation capacity value, a dynamic internal resistance value and a rate discharge performance value.
3. The method as claimed in claim 1, wherein after the testing of the dynamic internal resistance value of the battery to be tested after the operation of discharging within a preset time after the battery to be tested is charged to the upper limit voltage M times again, the method further comprises:
after the battery to be tested is subjected to operations of discharging to the upper limit voltage and then charging to the lower limit voltage for K times, testing the multiplying power charging performance value of the battery to be tested;
repeating the steps of testing the attenuation capacity value and testing the dynamic internal resistance value until the battery to be tested reaches the end of service life, and obtaining a plurality of groups of battery parameters corresponding to the repetition times, wherein the steps comprise:
repeating the steps of testing the attenuation capacity value, testing the dynamic internal resistance value and testing the rate charging performance value until the battery to be tested reaches the end of the service life, and obtaining a plurality of groups of battery parameters corresponding to the repetition times, wherein one group of battery parameters comprises an attenuation capacity value, a dynamic internal resistance value and a rate charging performance value.
4. The testing method of any of claims 1-3, wherein after said obtaining a plurality of sets of battery parameters corresponding to a number of repetitions, the method further comprises:
and obtaining the performance loss trend of the battery to be tested according to the plurality of groups of battery parameters.
5. A battery parameter testing apparatus, comprising:
the testing method comprises the steps that a first testing module is configured to test the attenuation capacity value of a battery to be tested after the battery to be tested is charged to an upper limit voltage and then discharged to a lower limit voltage for N times, wherein N is an integer greater than or equal to 1;
the second testing module is configured to test the dynamic internal resistance value of the battery to be tested after the battery to be tested is charged for M times again to the upper limit voltage and then discharged within a preset time, wherein M is an integer greater than or equal to 1;
and the cycle testing module is configured to repeat the steps of testing the attenuation capacity value and testing the dynamic internal resistance value until the battery to be tested reaches the service life end, and obtain a plurality of groups of battery parameters corresponding to the repetition times, wherein one group of battery parameters comprises an attenuation capacity value and a dynamic internal resistance value.
6. The testing device of claim 5, wherein the second testing module is further configured to:
after the battery to be tested is charged to the upper limit voltage and then discharged to the lower limit voltage for K times, testing the multiplying power discharge performance value of the battery to be tested;
the loop test module is further configured to:
repeating the steps of testing the attenuation capacity value, testing the dynamic internal resistance value and testing the rate discharge performance value until the battery to be tested reaches the end of service life, and obtaining a plurality of groups of battery parameters corresponding to the repetition times, wherein one group of battery parameters comprises an attenuation capacity value, a dynamic internal resistance value and a rate discharge performance value.
7. The testing device of claim 5, wherein the second testing module is further configured to:
after the battery to be tested is subjected to operations of discharging to the upper limit voltage and then charging to the lower limit voltage for K times, testing the multiplying power charging performance value of the battery to be tested;
the loop test module is further configured to:
repeating the steps of testing the attenuation capacity value, testing the dynamic internal resistance value and testing the rate charging performance value until the battery to be tested reaches the end of the service life, and obtaining a plurality of groups of battery parameters corresponding to the repetition times, wherein one group of battery parameters comprises an attenuation capacity value, a dynamic internal resistance value and a rate charging performance value.
8. A device for charge and discharge testing, characterized in that it is adapted to perform a method for testing parameters of a battery according to any one of claims 1-4.
9. An electronic device, comprising: a processor, a memory, and a bus;
the processor is connected to the memory via the bus, the memory storing computer readable instructions for implementing the method of any one of claims 1-4 when the computer readable instructions are executed by the processor.
10. A computer-readable storage medium, having stored thereon a computer program which, when executed, implements the method of any one of claims 1-4.
CN202210600727.8A 2022-05-30 2022-05-30 Method and device for testing battery parameters, medium and equipment for charging and discharging test Pending CN114895204A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117970137A (en) * 2024-03-28 2024-05-03 深圳市杰成镍钴新能源科技有限公司 Method and related device for detecting discharge end point of waste battery
CN118091436A (en) * 2024-04-26 2024-05-28 山东电工时代能源科技有限公司 Test method and test system of all-vanadium redox flow battery

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117970137A (en) * 2024-03-28 2024-05-03 深圳市杰成镍钴新能源科技有限公司 Method and related device for detecting discharge end point of waste battery
CN118091436A (en) * 2024-04-26 2024-05-28 山东电工时代能源科技有限公司 Test method and test system of all-vanadium redox flow battery

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