CN115951232B - Lithium battery charge and discharge quality detection method and system - Google Patents
Lithium battery charge and discharge quality detection method and system Download PDFInfo
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Abstract
The invention provides a method and a system for detecting charge and discharge quality of a lithium battery, which relate to the technical field of lithium batteries and are used for collecting calibration power supply parameters of the lithium battery to be tested, matching a test scene set, detecting initial parameters of the lithium battery to be tested, performing battery pretreatment, executing test, collecting current and voltage data, obtaining a test data set, obtaining charge and discharge deviation value information, performing temperature collection to obtain a temperature detection result, and generating a charge and discharge quality detection result according to the charge and discharge deviation value information, the temperature detection result and the test scene set. The invention solves the technical problems of the prior art that the control of various data in the charging and discharging process of the lithium battery is not clear, and realizes the rationalization and accurate control of the charging and discharging deviation value and the temperature data of the tested lithium battery in the quality detection process, thereby comprehensively carrying out the quality assessment of the lithium battery by a plurality of indexes and achieving the technical effect of improving the quality detection effect.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a method and a system for detecting charge and discharge quality of a lithium battery.
Background
The lithium battery is applied on a large scale in the communication industry at present, the total consumption exceeds 1GWh, and the lithium battery has many characteristics which meet the requirements on a novel battery from the aspect of the prior battery technology, but the service life of the lithium battery and the performance of a high-temperature environment face more disputes and also lack corresponding evaluation standards. From the practical use of operators and a large amount of test data, the technical characteristics, the use and maintenance requirements, the practical service life and the like of the lithium battery all need further verification. At present, the cycle life of the lithium battery has a clear conclusion, but many users have insufficient knowledge of the calendar life and high-temperature performance of the lithium battery, and the battery can be abused to generate a safety problem.
In the prior art, the control of various data in the charging and discharging process of the lithium battery is insufficient, so that the charging and discharging quality of the lithium battery is not clear.
Disclosure of Invention
The embodiment of the application provides a lithium battery charge and discharge quality detection method and system, which are used for solving the technical problems that in the prior art, each item of data is not controlled enough in the charge and discharge process of a lithium battery, so that the charge and discharge quality of the lithium battery is not clear.
In view of the above problems, embodiments of the present application provide a method and a system for detecting charge and discharge quality of a lithium battery.
In a first aspect, an embodiment of the present application provides a method for detecting charge and discharge quality of a lithium battery, where the method includes: acquiring calibration power supply parameters of a test lithium battery, and matching a test scene set based on the calibration power supply parameters; detecting and obtaining initial parameters of the test lithium battery, and performing battery pretreatment of the test lithium battery based on the initial parameters; after pretreatment is completed, testing the test lithium battery through the test scene set; collecting current data and voltage data of the test lithium battery through the test device to obtain a test data set; acquiring charge-discharge deviation value information through the test data set, the calibration power supply parameters and the test scene set; the temperature acquisition device is used for acquiring the temperature of the test lithium battery to obtain a temperature detection result; and generating a charge-discharge quality detection result according to the charge-discharge deviation value information, the temperature detection result and the test scene set.
In a second aspect, an embodiment of the present application provides a lithium battery charge-discharge quality detection system, the system includes: the calibration power supply parameter acquisition module is used for acquiring calibration power supply parameters of the test lithium battery and matching a test scene set based on the calibration power supply parameters; the battery pretreatment module is used for detecting and obtaining initial parameters of the test lithium battery and carrying out battery pretreatment of the test lithium battery based on the initial parameters; the execution test module is used for executing a test on the test lithium battery through the test scene set after the preprocessing is completed; the test data set acquisition module is used for acquiring current data and voltage data of the test lithium battery through the test device to obtain a test data set; the deviation value information acquisition module is used for acquiring charge and discharge deviation value information through the test data set, the calibration power supply parameters and the test scene set; the temperature acquisition module is used for acquiring the temperature of the test lithium battery through the temperature acquisition device to obtain a temperature detection result; and the quality detection result generation module is used for generating a charge and discharge quality detection result according to the charge and discharge deviation value information, the temperature detection result and the test scene set.
One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
the embodiment of the application provides a lithium battery charge and discharge quality detection method, which relates to the technical field of lithium batteries, and comprises the steps of acquiring calibration power supply parameters of a test lithium battery, matching a test scene set, detecting initial parameters of the test lithium battery, performing battery pretreatment of the test lithium battery, performing test on the test lithium battery, acquiring current data and voltage data of the test lithium battery, acquiring a test data set, acquiring charge and discharge deviation value information, performing temperature acquisition on the test lithium battery to obtain a temperature detection result, and generating a charge and discharge quality detection result according to the charge and discharge deviation value information, the temperature detection result and the test scene set. The method solves the technical problems of insufficient control of various data in the charging and discharging process of the lithium battery in the prior art, so that the charging and discharging quality of the lithium battery is not clear, and the rationalized and accurate control of the charging and discharging deviation value and the temperature data of the tested lithium battery in the quality detection process is realized, so that the quality evaluation of the lithium battery is comprehensively carried out by a plurality of indexes, and the technical effect of improving the quality detection effect is achieved.
The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.
Drawings
Fig. 1 is a schematic flow chart of a method for detecting charge and discharge quality of a lithium battery according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a scene charge and discharge quality detection result obtained in a lithium battery charge and discharge quality detection method according to an embodiment of the present application;
fig. 3 is a schematic flow chart of a charge and discharge quality detection result generated in a method for detecting charge and discharge quality of a lithium battery according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a system for detecting charge and discharge quality of a lithium battery according to an embodiment of the present application.
Reference numerals illustrate: the device comprises a calibration power supply parameter acquisition module 10, a battery preprocessing module 20, an execution test module 30, a test data set acquisition module 40, a deviation value information acquisition module 50, a temperature acquisition module 60 and a quality detection result generation module 70.
Detailed Description
The embodiment of the application provides a lithium battery charge and discharge quality detection method, which is used for solving the technical problem that the charge and discharge quality of a lithium battery is ambiguous due to the fact that the control of various data in the charge and discharge process of the lithium battery is insufficient in the prior art.
Example 1
As shown in fig. 1, an embodiment of the present application provides a method for detecting charge and discharge quality of a lithium battery, where the method is applied to a system for detecting charge and discharge quality of a lithium battery, and the system for detecting charge and discharge quality of a lithium battery is communicatively connected with a testing device and a temperature acquisition device, and the method includes:
step S100: acquiring calibration power supply parameters of a test lithium battery, and matching a test scene set based on the calibration power supply parameters;
specifically, the lithium battery charge and discharge quality detection method is applied to a lithium battery charge and discharge quality detection system, the lithium battery charge and discharge quality detection system is in communication connection with a testing device and a temperature acquisition device, the testing device is used for acquiring current data and voltage data of a tested lithium battery, and the temperature acquisition device is used for acquiring temperature of the tested lithium battery.
Firstly, the service life of the lithium battery with good quality is about two to three years, the weak performance of the lithium battery is that the electric quantity loss is very fast, the charging time is correspondingly reduced, and the protection of the lithium battery needs to be paid attention to in order to ensure the long service time of the battery. The calibration power supply parameters of the lithium battery comprise calibration parameters, structural parameters, electrical parameters and other parameters, wherein the calibration parameters comprise calibration voltage and calibration capacity, the unit of the calibration capacity is Ah, the calibration capacity is an index for reflecting the capacity of the battery, for example, 48V 100Ah represents that the capacity of the battery is 4.8 DEG electricity, and the calibration voltage and the calibration capacity are the most basic and core concepts of the battery. The electrical parameters include a charging voltage, a discharging voltage, a maximum discharging current, a rated discharging current, a maximum charging current, and a rated charging current, and a battery charging/discharging ratio is obtained according to a ratio of the charging/discharging current to the rated capacity, wherein the charging/discharging ratio is a measure representing a charging/discharging speed of the battery, and the capacity of the battery can be detected by different charging/discharging currents, for example, when the battery with the battery capacity of 100 A.h is discharged by 15A, the discharging ratio is 0.15C. Other parameters include operating temperature, communication interface, number of cycles, etc. And adjusting various calibration power supply parameters in a certain range, and then collocating to obtain a test scene set.
Step S200: detecting and obtaining initial parameters of the test lithium battery, and performing battery pretreatment of the test lithium battery based on the initial parameters;
specifically, the voltage of the test lithium battery is sampled through the capacitor, the voltage of the battery is obtained through detecting the voltage of the capacitor, the initial parameters of the test lithium battery are obtained through detecting the battery voltage, the working current and the battery temperature of the test lithium battery, the working state of the test lithium battery can be mastered according to the initial parameters, and the voltage of the lithium battery can represent the battery state most in all the battery parameters. In the battery pretreatment process, firstly, appearance detection is carried out on the lithium battery, and marks and logos of products are checked, wherein the content of the marks and logos comprises the quality of manufacturers, specification models, trademarks, anode and cathode electrodes and battery shells, the indexes such as shell hardness, liquid injection holes and the like are ensured, and the condition that the marked content is inconsistent with the actual content is particularly careful in the appearance inspection. Then, the test lithium battery is charged and discharged, typically in two cycles, and before the test, the battery is kept charged to 100%, and is left for one to five hours, in order to prevent excessive expansion during the test, constraint conditions during the test, such as a fixed steel plate, are simulated for the lithium battery.
Step S300: after pretreatment is completed, testing the test lithium battery through the test scene set;
specifically, the test for testing the lithium battery comprises start-up detection, capacity detection and temperature resistance property detection. And (3) performing starting detection, namely acquiring a multi-gear test temperature according to a test scene set, namely, taking 1 ℃ as an initial temperature, superposing at 1 ℃ every interval to acquire the multi-gear test temperature, respectively putting the preprocessed test lithium batteries into environments at different test temperatures, at least continuously for more than 20 hours, discharging at a large flow rate after taking out, and detecting discharge time, namely simulating discharge current of the test lithium batteries when starting at actual different temperatures. And (3) performing capacity detection to obtain fully charged voltage and non-charged voltage of the lithium battery, discharging the connection resistor of the lithium battery in a fully charged state until the discharge value is not charged, obtaining the whole discharge time and discharge current, and then calculating the capacity of the test current through integration according to the time and the current. And (3) performing temperature resistance performance detection, respectively placing the test lithium battery in an extreme temperature environment which is higher than normal use temperature for 24 hours, setting the extreme temperature to be higher than 60 ℃ and lower than-30 ℃ for an exemplary period, then placing the test lithium battery in the normal use temperature environment for 12 hours, setting the normal use temperature to be 25+/-10 ℃, performing an air tightness test, filling or extracting air into or from the test lithium battery according to the standard, and detecting whether the air pressure changes in a short time so as to determine the air tightness, wherein the temperature resistance performance of the test lithium battery is good if the test lithium battery is qualified.
Step S400: collecting current data and voltage data of the test lithium battery through the test device to obtain a test data set;
specifically, the test device is preferably a multimeter, which is a magneto-electric instrument with a rectifier and can measure various electrical parameters such as alternating current, direct current, voltage, resistance and the like. The meter head can not pass through large current, so that a plurality of resistors are connected in parallel and in series on the meter head to shunt or step down, thereby measuring the current, voltage and resistance in the circuit, taking the current, voltage and resistance as test data, and obtaining a test data set.
Step S500: acquiring charge-discharge deviation value information through the test data set, the calibration power supply parameters and the test scene set;
specifically, a test lithium battery charge-discharge characteristic curve is drawn, for example, a time is taken as a horizontal axis, a voltage is taken as a vertical axis, a change curve of voltage with time in the charge-discharge process is drawn, in the charge-discharge characteristic curve, the lowest discharge voltage can be defined by a cut-off discharge voltage, typically, a voltage at a state of charge of 0%, the voltage value is not a fixed value but changes with load, temperature, aging degree or others, and when the battery voltage is less than or equal to the lowest discharge voltage, the battery is called full discharge; the charge-discharge rate is a representation of the charge-discharge current relative to the battery capacity, and, for example, if the battery is fully discharged after 1 hour of discharge at 1C, different charge-discharge rates may result in different usable capacities, and generally the larger the discharge rate, the smaller the usable capacity. The relationship between the voltage and the battery capacity at different discharge rates is reflected by the curve, i.e., the larger the discharge rate is, the smaller the battery capacity is, and the battery capacity is decreased when the temperature is decreased. And respectively drawing a charge-discharge characteristic curve of the calibration power supply parameter and charge-discharge characteristic curves of the test lithium batteries under different test scenes, and obtaining charge-discharge deviation value information by comparing the distances between the curves, wherein the larger the curve distance between the test data and the calibration power supply parameter is, the larger the charge-discharge deviation value is.
Step S600: the temperature acquisition device is used for acquiring the temperature of the test lithium battery to obtain a temperature detection result;
specifically, the core of temperature acquisition is the temperature of the lithium battery monomer itself, the temperature acquisition device is preferably a thermistor, the terminal voltage of the thermistor is read by A/D sampling by adopting a voltage division method, the thermistor is arranged on the lithium battery monomer to be tested, the thermistors on different lithium batteries are connected to an A/D sampling circuit for sampling in a time-sharing manner, the temperature value is calculated according to the relation between the resistance and the temperature, the inspection of the temperature of the lithium battery monomer is realized, and the temperature detection result is obtained.
Step S700: and generating a charge-discharge quality detection result according to the charge-discharge deviation value information, the temperature detection result and the test scene set.
Specifically, according to the charge-discharge deviation value information, a charge-discharge characteristic curve of a test lithium battery and a charge-discharge characteristic curve of calibration parameters under different test scenes are obtained, a corresponding minimum discharge voltage and a corresponding charge-discharge rate are obtained according to the charge-discharge characteristic curve, and the test minimum discharge voltage and the test charge-discharge rate are compared with a standard minimum discharge voltage and a standard charge-discharge rate to obtain a first charge-discharge quality detection index; obtaining temperature distribution information of the lithium battery to be tested, namely temperature distribution conditions of different test parts, according to the temperature detection result, so as to obtain temperature difference data, correlating the temperature difference data with the test scene set, comparing the temperature difference data at the same test temperature, avoiding the influence of the test environment on the result, and obtaining a second charge and discharge quality detection index; and combining the first charge and discharge quality detection index and the second charge and discharge quality detection index to obtain a charge and discharge quality detection result.
Further, as shown in fig. 2, step S700 of the present application further includes:
step S700-1: extracting current data from the test data set, and sequencing the current sequence according to the time mark;
step S700-2: carrying out charge-discharge current stability analysis of the test process on the current sequence sequencing result to obtain a current stability evaluation result;
step S700-3: performing result integration based on the current stability evaluation results in the same test scene in the test scene set to obtain a scene current stability value;
step S700-4: and obtaining a scene charge and discharge quality detection result based on the scene current stable value, the corresponding test scene and the temperature detection result.
Specifically, standard deviation is calculated for the same group of test current data, and the calculation formula is as follows: standard deviation of
Wherein n is the number of a group of test current data, +.>
For the test current data therein, +.>
Is the average value of the test current. The standard deviation is the square root of the arithmetic mean of the square of the standard value of each unit data and the mean deviation, and reflects the degree of dispersion among individuals in a group of data. And acquiring a third charge and discharge quality detection result according to the scene current stable value, and adding the third charge and discharge quality detection result into a charge and discharge quality detection index to acquire the charge and discharge quality detection result.
Further, as shown in fig. 3, step S700 of the present application further includes:
step S710: obtaining layout position information of the temperature acquisition device;
step S720: generating temperature distribution information of the test lithium battery based on the temperature detection result and the layout position information;
step S730: obtaining temperature difference data through the temperature distribution information, and carrying out density identification through distribution test density data;
step S740: and generating the charge and discharge quality detection result based on the temperature difference data with the density identification and the test scene set.
Specifically, the battery module mainly comprises a plurality of battery cells, the temperature of the battery cells in the whole module can be obtained through a reasonable module design and a limited number of sampling points, the temperature of the battery cells is uniform during normal operation, and a larger temperature difference can be generated when the battery is abnormal. The temperature of the whole module is monitored through a plurality of arrangement positions, wherein the arrangement positions comprise a battery surface, a bus bar and a battery cover plate surface, temperature acquisition devices are arranged at different arrangement positions to acquire temperature acquisition results at different positions, temperature distribution information of a test lithium battery is obtained, temperature difference data of the whole module is calculated according to the temperature distribution information, density identification is carried out according to distribution test density data, and real battery temperature and data fed back by the temperature acquisition devices are compared under different working conditions. According to the working property of the lithium battery, the larger the temperature difference data at each position is, the larger the temperature difference of the battery core is, the more abnormal the battery core is, the smaller the temperature difference data at each position is, the smaller the temperature difference of the battery core is, the more normal the battery core is, the temperature difference data is associated with a test scene set, the temperature difference data is used as a fourth charge and discharge quality detection index, the fourth charge and discharge quality detection index is added into the charge and discharge quality detection index, and a charge and discharge quality detection result is obtained.
Further, step S740 of the present application further includes:
step S741: carrying out the same position temperature change statistics on the temperature detection result to construct a temperature change curve;
step S742: obtaining test environment temperature information based on the test scene set, and setting a scoring list through the test environment temperature information, wherein the scoring list and the temperature grading have a mapping relation;
step S743: setting distribution nodes, extracting temperature data from the temperature change curve based on the distribution nodes, and obtaining temperature scoring data according to a temperature data extraction result and the scoring list;
step S744: and generating the charge and discharge quality detection result based on the temperature scoring data and the temperature difference data.
Specifically, temperature detection results are grouped according to the acquisition positions to respectively obtain temperature acquisition results of the battery surface, the bus bar and the battery cover plate surface, for one group of data, such as the temperature of the battery surface, the group of data of the temperatures under different scenes are acquired, the test environment temperature is ordered from low to high, the test environment temperature is taken as an abscissa, the battery surface temperature acquisition results under different scenes are taken as an ordinate, and a temperature change curve is drawn, so that the change condition of the temperatures at different positions of the test lithium battery along with the temperature of the test scene is displayed. Setting a grading list, namely grading the grading list by taking the standard temperature as full scale, wherein each time the standard temperature is increased or decreased by 1 degree centigrade, the grading list is graded, the temperature difference between the grading list and the standard temperature is S-grade at +/-5 ℃, and each time the temperature difference is increased by +/-5 ℃ by one grade, so that an environmental temperature grading result is obtained, wherein each grade corresponds to a plurality of groups of testing environmental temperature grading results.
Setting distribution nodes according to an environmental temperature grading result, wherein a standard temperature is used as a first node, two grades of temperatures corresponding to the highest temperature and the lowest temperature of the S grade are used as a second node and a third node, sequentially obtaining a plurality of nodes, respectively obtaining temperature data corresponding to each node, and obtaining temperature grading data according to a grading list. And acquiring temperature scoring data at different positions, wherein the more stable the temperature scoring data is, the better the state of the tested lithium battery is, taking the temperature scoring data as a fifth charge and discharge quality detection index, adding the fifth charge and discharge quality detection index into the charge and discharge quality detection index, and acquiring a charge and discharge quality detection result.
Further, the present application further includes:
step S810: obtaining the actual application environment information of the test lithium battery;
step S820: scene weight distribution of the test scene set is carried out through the actual application environment information, and a scene weight distribution result is obtained;
step S830: counting to obtain the charge-discharge deviation value information and the temperature detection result corresponding to each test scene in the test scene set;
step S840: and carrying out weighted calculation according to the statistical result and the weight distribution result, and generating the charge and discharge quality detection result based on the weighted calculation result.
Specifically, the application field of lithium batteries is mainly occasions with smaller battery capacity of electronic devices such as cameras, mobile phones, notebook computers and the like, and actual application environment information such as large environment temperature change and small environment temperature change is obtained according to the use occasions of the occasions. According to the environment information with larger change of the actual application environment information and the environment information in the test scene set, higher calculation weight is distributed to the environment information with higher matching degree, so that scene weight distribution is performed, and when the environment temperature change is large, the environment temperature weight in the test scene set is set to be larger, for example, the ratio of the environment temperature to other environment information is 7:3, the adaptability of the lithium battery to the temperature change is used as a main quality detection index, and the adaptability is used as a scene weight distribution result.
Counting charge-discharge deviation value information and temperature detection results under different test scenes, and testing charge-discharge deviation value change conditions and temperature detection result change conditions of the lithium battery when other conditions are unchanged and the temperature is gradually increased; or under the condition of constant temperature, when other data are changed, testing the change condition of the charge-discharge deviation value and the change condition of the temperature detection result of the lithium battery. And carrying out weighted calculation according to the weight distribution result, wherein the higher the weighted calculation result is, the better the quality of the lithium battery is tested, taking the weighted calculation result as a sixth charge and discharge quality detection index, adding the sixth charge and discharge quality detection index into the charge and discharge quality detection index, and obtaining the charge and discharge quality detection result.
Further, the present application further includes:
step S510: calculating the charge and discharge rate of the test lithium battery through the test data set to obtain a charge and discharge rate calculation result;
step S520: data comparison is carried out on the charge and discharge rate calculation result and the calibration power supply parameter, and a data comparison result is obtained;
step S530: and generating a charge-discharge quality detection result according to the charge-discharge deviation value information, the data comparison result, the temperature detection result and the test scene set.
Specifically, the charge-discharge rate is a measure showing the charge-discharge speed, the capacity used is 1 hour after the discharge is completed, then 1C discharge is performed, 5 hours after the discharge is completed, then 1/5=0.2C discharge is performed, and the charge-discharge rate=charge-discharge current/rated capacity, for example, when the battery with rated capacity of 100a·h is discharged by 20A, the discharge rate is 0.2C, so the charge-discharge rate is a measure showing the charge-discharge current relative to the battery capacity, for example, when the battery is completely discharged after 1 hour by 1C, different available capacities are caused by different charge-discharge rates, and in general, the larger the discharge rate is, the smaller the available capacity is. Calculating the ratio of the charge and discharge rate calculation result to the charge and discharge rate in the calibration power supply parameter, wherein the ratio is closer to 1, which indicates that the quality of the tested lithium battery is better, taking the ratio as a seventh charge and discharge quality detection index, adding the seventh charge and discharge quality detection index into the charge and discharge quality detection index, and obtaining the charge and discharge quality detection result.
Further, the present application further includes:
step S910: obtaining a limit scene in the test scene set, and extracting test data of the limit scene;
step S920: generating an environmental suitability evaluation result based on the test data extracted from the limit scene;
step S930: and adding the environmental suitability evaluation result to the charge and discharge quality detection result.
Specifically, the extreme conditions, that is, the extreme conditions in various conditions, are exemplified by the environmental temperature, the extreme temperatures are set to be higher than 60 ℃ and lower than-30 ℃, then the temperature is set to be 25+ -10 ℃ in the normal use temperature environment for 12 hours, then the air tightness test is performed, the test lithium battery is filled with or extracted with air according to the standard, whether the air pressure changes in a short time is detected, so that the air tightness is determined, the better the air tightness is, the better the environmental adaptability of the test lithium battery is, and the result of the environmental adaptability evaluation is taken as the result. And taking the environmental suitability evaluation result as an eighth charge and discharge quality detection index, adding the eighth charge and discharge quality detection index into the charge and discharge quality detection index, and obtaining a charge and discharge quality detection result.
Example two
Based on the same inventive concept as the method for detecting the charge and discharge quality of a lithium battery in the foregoing embodiments, as shown in fig. 4, the present application provides a system for detecting the charge and discharge quality of a lithium battery, where the system includes:
the calibration power supply parameter acquisition module 10 is used for acquiring calibration power supply parameters of the test lithium battery, and matching a test scene set based on the calibration power supply parameters;
the battery pretreatment module 20 is used for detecting and obtaining initial parameters of the test lithium battery, and carrying out battery pretreatment of the test lithium battery based on the initial parameters;
an execution test module 30, wherein the execution test module 30 is configured to execute a test on the test lithium battery through the test scene set after the preprocessing is completed;
the test data set acquisition module 40 is used for acquiring current data and voltage data of the test lithium battery through the test device to obtain a test data set;
the deviation value information acquisition module 50 is used for acquiring charge and discharge deviation value information through the test data set, the calibration power supply parameters and the test scene set by the deviation value information acquisition module 50;
the temperature acquisition module 60 is used for acquiring the temperature of the test lithium battery through the temperature acquisition device, so as to obtain a temperature detection result;
the quality detection result generating module 70 is configured to generate a charge-discharge quality detection result according to the charge-discharge deviation value information, the temperature detection result and the test scene set, by using the quality detection result generating module 70.
Further, the system further comprises:
the current data extraction module is used for extracting current data from the test data set and sequencing current sequences according to the time marks;
the stability analysis module is used for carrying out charge and discharge flow stability analysis in the test process on the current sequence sequencing result to obtain a current stability evaluation result;
the result integration module is used for integrating results based on the current stability evaluation results in the same test scene in the test scene set to obtain a scene current stability value;
the first quality detection result acquisition module is used for acquiring a scene charge and discharge quality detection result based on the scene current stable value, the corresponding test scene and the temperature detection result.
Further, the system further comprises:
the distribution position information acquisition module is used for acquiring the distribution position information of the temperature acquisition device;
the temperature distribution information acquisition module is used for generating temperature distribution information of the test lithium battery based on the temperature detection result and the layout position information;
the density identification module is used for obtaining temperature difference data through the temperature distribution information and carrying out density identification through distribution test density data;
and the second quality detection result acquisition module is used for generating the charge and discharge quality detection result based on the temperature difference data with the density identification and the test scene set.
Further, the system further comprises:
the temperature change statistics module at the same position is used for carrying out temperature change statistics at the same position on the temperature detection result to construct a temperature change curve;
the grading list acquisition module is used for acquiring test environment temperature information based on the test scene set, and setting a grading list according to the test environment temperature information, wherein the grading list and the temperature grading have a mapping relation;
the distribution node setting module is used for setting distribution nodes, extracting temperature data from the temperature change curve based on the distribution nodes, and obtaining temperature grading data according to a temperature data extraction result and the grading list;
and the third quality detection result acquisition module is used for generating the charge and discharge quality detection result based on the temperature scoring data and the temperature difference data.
Further, the system further comprises:
the actual application environment acquisition module is used for acquiring the actual application environment information of the test lithium battery;
the weight distribution result acquisition module is used for carrying out scene weight distribution of the test scene set through the actual application environment information to obtain a scene weight distribution result;
the temperature detection result statistics module is used for statistically obtaining the charge-discharge deviation value information and the temperature detection result corresponding to each test scene in the test scene set;
and the weighting calculation module is used for carrying out weighting calculation according to the statistical result and the weight distribution result and generating the charge and discharge quality detection result based on the weighting calculation result.
Further, the system further comprises:
the rate calculation result acquisition module is used for calculating the charge and discharge rate of the test lithium battery through the test data set to obtain a charge and discharge rate calculation result;
the data comparison module is used for comparing the charge and discharge rate calculation result with the calibration power supply parameters to obtain a data comparison result;
and the fourth quality detection result acquisition module is used for generating a charge and discharge quality detection result according to the charge and discharge deviation value information, the data comparison result, the temperature detection result and the test scene set.
Further, the system further comprises:
the limit scene acquisition module is used for acquiring limit scenes in the test scene set and extracting test data of the limit scenes;
the environment adaptability evaluation result generation module is used for generating an environment adaptability evaluation result based on the test data extracted from the limit scene;
and a fifth quality detection result acquisition module, configured to add the environmental suitability evaluation result to the charge and discharge quality detection result.
In the present disclosure, through the foregoing detailed description of a method for detecting the charge and discharge quality of a lithium battery, those skilled in the art can clearly know a method and a system for detecting the charge and discharge quality of a lithium battery in this embodiment, and for the device disclosed in the embodiment, since the device corresponds to the method disclosed in the embodiment, the description is relatively simple, and relevant places refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The method is characterized by being applied to a lithium battery charge and discharge quality detection system, wherein the lithium battery charge and discharge quality detection system is in communication connection with a testing device and a temperature acquisition device, and the method comprises the following steps:
acquiring calibration power supply parameters of a test lithium battery, and matching a test scene set based on the calibration power supply parameters;
detecting and obtaining initial parameters of the test lithium battery, and performing battery pretreatment of the test lithium battery based on the initial parameters;
after pretreatment is completed, testing the test lithium battery through the test scene set;
collecting current data and voltage data of the test lithium battery through the test device to obtain a test data set;
acquiring charge-discharge deviation value information through the test data set, the calibration power supply parameters and the test scene set;
the temperature acquisition device is used for acquiring the temperature of the test lithium battery to obtain a temperature detection result;
generating a charge-discharge quality detection result according to the charge-discharge deviation value information, the temperature detection result and the test scene set;
extracting current data from the test data set, and sequencing the current sequence according to the time mark;
carrying out charge-discharge current stability analysis of the test process on the current sequence sequencing result to obtain a current stability evaluation result;
performing result integration based on the current stability evaluation results in the same test scene in the test scene set to obtain a scene current stability value;
obtaining a scene charge and discharge quality detection result based on the scene current stable value and the corresponding test scene and the temperature detection result;
obtaining layout position information of the temperature acquisition device;
generating temperature distribution information of the test lithium battery based on the temperature detection result and the layout position information;
obtaining temperature difference data through the temperature distribution information, and carrying out density identification through distribution test density data;
and generating the charge and discharge quality detection result based on the temperature difference data with the density identification and the test scene set.
2. The method of claim 1, wherein the method comprises:
carrying out the same position temperature change statistics on the temperature detection result to construct a temperature change curve;
obtaining test environment temperature information based on the test scene set, and setting a scoring list through the test environment temperature information, wherein the scoring list and the temperature grading have a mapping relation;
setting distribution nodes, extracting temperature data from the temperature change curve based on the distribution nodes, and obtaining temperature scoring data according to a temperature data extraction result and the scoring list;
and generating the charge and discharge quality detection result based on the temperature scoring data and the temperature difference data.
3. The method of claim 1, wherein the method comprises:
obtaining the actual application environment information of the test lithium battery;
scene weight distribution of the test scene set is carried out through the actual application environment information, and a scene weight distribution result is obtained;
counting to obtain the charge-discharge deviation value information and the temperature detection result corresponding to each test scene in the test scene set;
and carrying out weighted calculation according to the statistical result and the weight distribution result, and generating the charge and discharge quality detection result based on the weighted calculation result.
4. The method of claim 1, wherein the method comprises:
calculating the charge and discharge rate of the test lithium battery through the test data set to obtain a charge and discharge rate calculation result;
data comparison is carried out on the charge and discharge rate calculation result and the calibration power supply parameter, and a data comparison result is obtained;
and generating a charge-discharge quality detection result according to the charge-discharge deviation value information, the data comparison result, the temperature detection result and the test scene set.
5. The method of claim 1, wherein the method comprises:
obtaining a limit scene in the test scene set, and extracting test data of the limit scene;
generating an environmental suitability evaluation result based on the test data extracted from the limit scene;
and adding the environmental suitability evaluation result to the charge and discharge quality detection result.
6. A lithium battery charge-discharge quality detection system, characterized in that, the system is connected with testing arrangement, temperature acquisition device communication, the system includes:
the calibration power supply parameter acquisition module is used for acquiring calibration power supply parameters of the test lithium battery and matching a test scene set based on the calibration power supply parameters;
the battery pretreatment module is used for detecting and obtaining initial parameters of the test lithium battery and carrying out battery pretreatment of the test lithium battery based on the initial parameters;
the execution test module is used for executing a test on the test lithium battery through the test scene set after the preprocessing is completed;
the test data set acquisition module is used for acquiring current data and voltage data of the test lithium battery through the test device to obtain a test data set;
the deviation value information acquisition module is used for acquiring charge and discharge deviation value information through the test data set, the calibration power supply parameters and the test scene set;
the temperature acquisition module is used for acquiring the temperature of the test lithium battery through the temperature acquisition device to obtain a temperature detection result;
the quality detection result generation module is used for generating a charge and discharge quality detection result according to the charge and discharge deviation value information, the temperature detection result and the test scene set;
the current data extraction module is used for extracting current data from the test data set and sequencing current sequences according to the time marks;
the stability analysis module is used for carrying out charge and discharge flow stability analysis in the test process on the current sequence sequencing result to obtain a current stability evaluation result;
the result integration module is used for integrating results based on the current stability evaluation results in the same test scene in the test scene set to obtain a scene current stability value;
the first quality detection result acquisition module is used for acquiring a scene charge and discharge quality detection result based on the scene current stable value, the corresponding test scene and the temperature detection result;
the distribution position information acquisition module is used for acquiring the distribution position information of the temperature acquisition device;
the temperature distribution information acquisition module is used for generating temperature distribution information of the test lithium battery based on the temperature detection result and the layout position information;
the density identification module is used for obtaining temperature difference data through the temperature distribution information and carrying out density identification through distribution test density data;
and the second quality detection result acquisition module is used for generating the charge and discharge quality detection result based on the temperature difference data with the density identification and the test scene set.
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