CN113533972A - Lithium ion battery hazard grade judgment method and intelligent judgment system - Google Patents
Lithium ion battery hazard grade judgment method and intelligent judgment system Download PDFInfo
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- CN113533972A CN113533972A CN202110736137.3A CN202110736137A CN113533972A CN 113533972 A CN113533972 A CN 113533972A CN 202110736137 A CN202110736137 A CN 202110736137A CN 113533972 A CN113533972 A CN 113533972A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
The invention discloses a lithium ion battery hazard grade judging method and an intelligent judging system, wherein the method comprises the following steps: s1: classifying the damage grades according to various abnormal phenomena occurring when the lithium ion battery fails; s2: testing the lithium ion battery, and recording the lithium ion battery for testing; s3: performing hazard rating on the tested battery according to the hazard rating classification in the step S1 and the appearance of the tested battery in the step S2; s4: according to the hazard grade judgment in the step S3, giving a test hazard judgment result of the tested lithium ion battery; the intelligent judgment system comprises a main control module, the main control module is respectively connected with a data storage module and an intelligent judgment module, and the data storage module is respectively connected with an infrared temperature measurement module, a camera module and a quality detection module.
Description
Technical Field
The invention relates to a lithium ion battery hazard grade judging method and an intelligent judging system.
Background
The lithium ion battery may have a failure risk during performance testing and safety testing, but at present, no harm grade determination standard exists in domestic standards for determining whether the lithium ion battery fails, and manual detection and determination are required during battery testing. In the document of GB 38031-2020 Power storage battery safety requirement for electric vehicles, the judgment condition that the safety test of the lithium ion battery passes is 'no fire and no explosion'. However, in practice, various other failure phenomena occur in the battery test process, that is, the specific test phenomena in GB are described singly, and the determination conditions are not accurate enough. In addition, a damage level determination method for battery core failure which may occur in lithium battery performance tests (including cycle, HPPC, storage and the like tests) is not specified in the document. In < free CAR Electrical Energy Storage System abstract Test Manual for Electric and Hybrid Electric Applications SAND2005-3123> and < SAE _ J2464-2009 Electric and Hybrid Electric Vehicle Rechargeable Energy Storage System (RESS) Safety and Absuse Testing > documents, a method of determining the hazard level of a cell in performance and Safety tests is described, but the hazard level determination is still not detailed enough to cover various situations that occur, such as: the influence of the normal working temperature rise and the abnormal temperature rise of the battery on the damage grade, the influence of leakage trace without weight loss, the influence of self-discharge and DCR growth on the damage grade of the battery and the like can not be realized by the method, so that the method can not be used for professional damage grade classification.
Disclosure of Invention
The invention provides a lithium ion battery hazard grade judgment method and an intelligent judgment system, which are used for solving the problems that the description of the specific test phenomenon of the lithium ion battery in the prior art is single, the hazard grade judgment condition is not accurate and detailed, the various conditions are not covered, and the manual test and evaluation are needed when the lithium ion battery is tested.
In order to achieve the purpose, the invention adopts the following technical scheme:
a lithium ion battery hazard grade judging method comprises the following steps: s1: classifying the damage grades according to various abnormal phenomena occurring when the lithium ion battery fails; s2: testing the lithium ion battery, and recording the phenomenon of the lithium ion battery after testing; s3: performing hazard rating on the tested battery according to the hazard rating classification in the step S1 and the appearance of the tested battery in the step S2; s4: according to the hazard level determination in step S3, a result of the determination of the hazard of the test of the tested lithium ion battery is given. In the method, a set of detailed lithium ion battery hazard grade judgment method is formulated for judging the hazard degree of the lithium ion battery in the test so as to classify the lithium ion battery, and the method is beneficial to analyzing the failure and potential hazard of the lithium ion battery so as to judge whether the lithium ion battery is qualified or not, or further analyzing the failure and hazard of the lithium ion battery, thereby determining the next plan, such as a battery cell material development solution, a research and development direction and the like.
As a preferable aspect of the present invention, the hazard classification in step S1 includes: if the lithium ion battery explodes, the hazard grade is 7; if the lithium ion battery is not exploded and bursts, and the internal components are violently sprayed out, the hazard grade is 6; if the lithium ion battery is not exploded or burst, a fire or a fire tongue appears, and the hazard grade is 5; if the lithium ion battery is not exploded or burst, fire or fire tongue does not appear, the electrolyte leakage and other quality loss conditions occur, and the loss quality is more than or equal to 50% of the electrolyte quality, the damage grade is 4; if the lithium ion battery is not exploded or burst, and has no fire or flame front, and the electrolyte leakage and other quality loss conditions occur, and the loss quality is less than 50% of the electrolyte quality, the damage grade is 3; if the lithium ion battery is not exploded or burst, and fire or a flare tongue occurs, electrolyte leaks, the mass of the leaked electrolyte is within the weighing uncertainty of the electronic balance, and the electrolyte leakage trace can be observed, the damage grade is 3; if the lithium ion battery is not exploded or burst, fire and a fire tongue do not appear, the electrolyte is not leaked, and the temperature rise is more than or equal to X ℃, the hazard grade is 3; if the lithium ion battery is not exploded or burst, fire and a fire tongue do not appear, the electrolyte is not leaked, the temperature rise is less than X ℃, and the battery is irreversibly damaged, the damage grade is 2; if the lithium ion battery is not exploded or burst, fire and a fire tongue do not appear, electrolyte is not leaked, the temperature rise is less than X ℃, and the battery is reversibly damaged, the damage grade is 1; if the lithium ion battery is not exploded or burst, fire and a fire tongue do not appear, the electrolyte is not leaked, and the temperature rise is less than X ℃, the hazard grade is 0. In the method, the damage grades of the lithium ion batteries are described and judged in detail, the judgment conditions are various and accurate, various possible failure conditions of the lithium ion batteries are covered, the lithium ion batteries are tested, the phenomena of the batteries after the test are recorded, the damage grades are evaluated according to the phenomena of the batteries, the higher the grade is, the greater the damage of the lithium ion batteries is, the poorer the quality is, the lower the grade is, the smaller the damage of the lithium ion batteries is, the higher the quality is, and the grade judgment is carried out on the lithium ion batteries which are difficult to judge and have no obvious appearance change aiming at the aspects of the change of DCR, the loss of capacity, self-discharge and the like of the lithium ion batteries, so that the damage grades can be classified more effectively.
As a preferred scheme of the invention, the value of X in the temperature rise X ℃ is set by a manufacturer according to the requirement, and the value of X is the upper limit of the normal working temperature of the lithium ion battery. The performance and the requirements of lithium ion batteries produced by different manufacturers, lithium ion batteries produced by different production processes and lithium ion batteries with different purposes are different, so that the specific requirements on the temperature rise are different during testing, and the value of X in the temperature rise at X ℃ is not set as a fixed value, so that the method has wider application range and strong applicability.
As a preferred embodiment of the present invention, the test in step S2 includes a performance test and a safety test. The performance test comprises circulation, HPPC (hybrid power pulse capability characteristic), storage, capacity, working condition circulation and other tests, and the safety test comprises acupuncture, extrusion, overcharge, overdischarge, short circuit, heating and other tests.
As a preferred embodiment of the present invention, the irreversible damage includes the following cases: 1) irreversible damage to the battery structure by safety test and performance test; 2) the capacity loss of the tests such as storage, circulation and the like is more than a%, the direct-current internal resistance is increased by more than b%, and the self-discharge capacity loss is more than c%, wherein the values of a, b and c are values required by customers. The performance and requirements of lithium ion batteries produced by different manufacturers, lithium ion batteries produced by different production processes and lithium ion batteries with different purposes are different, so that the specific requirements of capacity loss, DCR increase and self-discharge capacity loss of storage, circulation and the like of the lithium ion batteries are different when the lithium ion batteries are tested, and the numerical values of a, b and c are not set as fixed values, so that the method disclosed by the invention is wider in application range and strong in applicability.
As a preferable aspect of the present invention, the performance test is a test item that is judged not to pass when the hazard level is 2 or more; and when the hazard level is 5 or more in the safety test, the test item is judged not to pass. For the performance test, when the hazard level is 2 or above, the test is not passed, and the test needs to be stopped in time to prevent larger safety accidents and further analyze the reasons of abnormity; for the safety test, when the hazard level is 5 or above, the test is not passed, and when the hazard level is 5 or above, the lithium ion battery design verifies that the safety risk is high based on the method, and a comprehensive method and a battery design are needed to evaluate the safety performance of the lithium ion battery.
The lithium ion battery hazard grade intelligent judgment system comprises a main control module, wherein the main control module is respectively connected with a data storage module and an intelligent judgment module, and the data storage module is respectively connected with an infrared temperature measurement module, a camera module and a quality detection module. The main control module controls other modules to work, the data storage module stores data from the infrared temperature measurement module, the camera module and the quality detection module, the infrared temperature measurement module is used for detecting the temperature of the lithium ion battery, the infrared thermal image obtained by detection is transmitted to the data storage module, the camera module is used for shooting and shooting the lithium ion battery, the obtained photo data is transmitted to the data storage module, the quality detection module is used for measuring the quality of the lithium ion battery, the obtained quality data is transmitted to the data storage module, the intelligent judgment module analyzes and compares the obtained data, and the damage grade is judged by combining with the damage grade classification.
As a preferred aspect of the present invention, the intelligent determination module includes a temperature comparison unit, an image analysis unit, and a quality comparison unit. The temperature comparison unit carries out real-time intelligent analysis on an infrared thermograph in the data storage module, the image analysis unit carries out real-time intelligent analysis on a photo in the data storage module, the quality comparison unit analyzes quality measurement data in the data storage module, and the main control module compares the analyzed results of the temperature comparison module, the image analysis module and the quality comparison module with the damage grade classification to obtain the damage grade of the lithium ion battery.
As a preferred scheme of the present invention, the intelligent judgment system further comprises a display unit, the display unit is connected with the main control module, and the work flow of the intelligent judgment system comprises the following steps: q1: the infrared temperature measurement module, the camera module and the quality detection module are used for detecting the lithium ion battery under test in real time and storing the detected data in the data storage module; q2: the main control module sends the data in the data storage module to the intelligent judgment module for processing, and the intelligent judgment module stores the processing result to the data storage module after processing is completed; q3: the main control module completes the judgment of the hazard level of the lithium ion battery according to the processing result stored in the Q2 to the data storage module and by combining hazard level classification; q4: and storing the judgment result of the hazard level of the lithium ion battery into a data storage module, and displaying the judgment result of the hazard level of the lithium ion battery on a display module. The intelligent lithium ion battery hazard level judgment system is suitable for a lithium ion battery hazard level judgment method, and can automatically finish the hazard level evaluation of the lithium ion battery when the lithium ion battery is tested, and display the result on the display module without manual operation.
Therefore, the invention has the following beneficial effects: the damage grade judgment of the lithium ion battery is carried out according to various failure abnormal phenomena after the lithium ion battery is tested, the damage grade judgment is accurate and detailed, various conditions are covered, the damage grade evaluation can be automatically carried out, and manual operation is not needed.
Drawings
FIG. 1 is a flow chart of the method steps of the present invention;
FIG. 2 is a flow chart of lithium ion battery hazard rating of the present invention;
fig. 3 is a block diagram of the configuration of the intelligent determination system of the present invention.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
As shown in fig. 1, a method for determining a lithium ion battery hazard level includes the following steps: s1: classifying the damage grades according to various abnormal phenomena occurring when the lithium ion battery fails; s2: testing the lithium ion battery, and recording the phenomenon of the battery after testing; s3: performing hazard rating on the tested battery according to the hazard rating classification in the step S1 and the appearance of the tested battery in the step S2; s4: according to the hazard level determination in step S3, a result of the determination of the hazard of the test of the tested lithium ion battery is given. In the method, a set of detailed lithium ion battery hazard grade judgment method is formulated for judging the hazard degree of the lithium ion battery in the test so as to classify the lithium ion battery, and the method is beneficial to analyzing the failure and potential hazard of the lithium ion battery so as to judge whether the lithium ion battery is qualified or not, or further analyzing the failure and hazard of the lithium ion battery, thereby determining the next plan, such as a battery cell material development solution, a research and development direction and the like.
As shown in fig. 2, the hazard level classification in step S1 includes: if the lithium ion battery explodes, the hazard level is 7; if the lithium ion battery is not exploded but is burst, the internal components are violently sprayed out, and the hazard grade is 6; if the lithium ion battery is not exploded or burst, but has a fire or a fire tongue, the hazard grade is 5; if the lithium ion battery is not exploded or burst, and fire and a flare tongue do not appear, the quality loss conditions such as electrolyte leakage and the like appear, the loss quality is more than or equal to 50 percent of the electrolyte quality, and the damage grade is 4; if the lithium ion battery is not exploded or burst, and fire and a fire tongue do not appear, the quality loss conditions such as electrolyte leakage and the like appear, the loss quality is less than 50 percent of the electrolyte quality, and the damage grade is 3; if the lithium ion battery is not exploded or burst, and fire or a flare tongue does not appear, electrolyte leakage occurs, the mass of the leaked electrolyte is within the weighing uncertainty of the electronic balance, the electrolyte leakage trace can be observed, and the damage grade is 3; if the lithium ion battery is not exploded or burst, fire and a fire tongue do not appear, the electrolyte is not leaked, but the temperature rise is more than or equal to X ℃, and the hazard grade is 3; if the lithium ion battery is not exploded or burst, and has no fire or fire tongue, no electrolyte is leaked, but the temperature rise is less than X ℃, the battery has irreversible damage and can not be repaired, and the damage grade is 2; if the lithium ion battery is not exploded or burst, and has no fire or flame tongue, no electrolyte leakage occurs, the temperature rise is less than X ℃, the battery has reversible damage (has function loss but can be repaired), and the damage grade is 1; if the lithium ion battery is not exploded or burst, fire and a fire tongue do not appear, the electrolyte is not leaked, the temperature rise is less than X ℃, the battery has no influence, and the hazard grade is 0. In the method, the damage grades of the lithium ion batteries are described and judged in detail, the judgment conditions are various and accurate, various possible failure conditions of the lithium ion batteries are covered, the lithium ion batteries are tested, the phenomena of the batteries after the test are recorded, the damage grades are evaluated according to the phenomena of the batteries, the higher the grade is, the greater the damage of the lithium ion batteries is, the poorer the quality is, the lower the grade is, the smaller the damage of the lithium ion batteries is, the higher the quality is, and the grade judgment is carried out on the lithium ion batteries which are difficult to judge and have no obvious appearance change aiming at the aspects of the change of DCR, the loss of capacity, self-discharge and the like of the lithium ion batteries, so that the damage grades can be classified more effectively.
The value of X in the temperature rise X ℃ in the hazard classification is set by a manufacturer according to the requirement, and the value of X is the upper limit of the normal working temperature of the lithium ion battery. The performance and the requirements of lithium ion batteries produced by different manufacturers, lithium ion batteries produced by different production processes and lithium ion batteries with different purposes are different, so that the specific requirements on the temperature rise are different during testing, and the value of X in the temperature rise at X ℃ is not set as a fixed value, so that the method has wider application range and strong applicability.
The test in step S2 includes a performance test and a safety test. The performance test comprises circulation, HPPC (hybrid power pulse capability characteristic), storage, capacity, working condition circulation and other tests, and the safety test comprises acupuncture, extrusion, overcharge, overdischarge, short circuit, heating and other tests.
Irreversible damage in hazard-grade classification includes the following: 1) irreversible damage to the battery structure by safety test and performance test; 2) the capacity loss of the tests such as storage, circulation and the like is more than a%, the direct-current internal resistance is increased by more than b%, and the self-discharge capacity loss is more than c%, wherein the values of a, b and c are values required by customers. The performance and requirements of lithium ion batteries produced by different manufacturers, lithium ion batteries produced by different production processes and lithium ion batteries with different purposes are different, so that the specific requirements of capacity loss, DCR increase and self-discharge capacity loss of storage, circulation and the like of the lithium ion batteries are different when the lithium ion batteries are tested, and the numerical values of a, b and c are not set as fixed values, so that the method disclosed by the invention is wider in application range and strong in applicability.
In the performance test, when the hazard level is 2 or more, and when the hazard level is 2 or more, the test item is judged not to pass; and (4) safety testing, wherein when the hazard level is 5 or more, the test item is judged not to pass. For the performance test, when the hazard level is 2 or above, the test is not passed, and the test needs to be stopped in time to prevent larger safety accidents and further analyze the reasons of abnormity; for the safety test, when the hazard level is 5 or above, the test is not passed, and when the hazard level is 5 or above, the lithium ion battery design verifies that the safety risk is high based on the method, and a comprehensive method and a battery design are needed to evaluate the safety performance of the lithium ion battery.
As shown in fig. 3, an intelligent lithium ion battery hazard level determination system includes a main control module, the main control module is respectively connected with a data storage module and an intelligent determination module, and the data storage module is respectively connected with an infrared temperature measurement module, a camera module and a quality detection module. The main control module controls other modules to work, the data storage module stores data from the infrared temperature measurement module, the camera module and the quality detection module, the infrared temperature measurement module is used for detecting the temperature of the lithium ion battery, the infrared thermal image obtained by detection is transmitted to the data storage module, the camera module is used for shooting and shooting the lithium ion battery, the obtained photo data is transmitted to the data storage module, the quality detection module is used for measuring the quality of the lithium ion battery, the obtained quality data is transmitted to the data storage module, the intelligent judgment module analyzes and compares the obtained data, and the damage grade is judged by combining with the damage grade classification.
The intelligent judgment module comprises a temperature comparison unit, an image analysis unit and a quality comparison unit. The temperature comparison unit carries out real-time intelligent analysis on an infrared thermograph in the data storage module, the image analysis unit carries out real-time intelligent analysis on a photo in the data storage module, the quality comparison unit analyzes quality measurement data in the data storage module, and the main control module compares the analyzed results of the temperature comparison module, the image analysis module and the quality comparison module with the damage grade classification to obtain the damage grade of the lithium ion battery.
The display unit is connected with the main control module, and the work flow of the intelligent judgment system comprises the following steps: q1: the infrared temperature measurement module, the camera module and the quality detection module are used for detecting the lithium ion battery under test in real time and storing the detected data in the data storage module; q2: the main control module sends the data in the data storage module to the intelligent judgment module for processing, and the intelligent judgment module stores the processing result to the data storage module after processing is completed; q3: the main control module completes the judgment of the hazard level of the lithium ion battery according to the processing result stored in the Q2 to the data storage module and by combining hazard level classification; q4: and storing the judgment result of the hazard level of the lithium ion battery into a data storage module, and displaying the judgment result of the hazard level of the lithium ion battery on a display module. The intelligent lithium ion battery hazard level judgment system is suitable for a lithium ion battery hazard level judgment method, and can automatically finish the hazard level evaluation of the lithium ion battery without manual operation when the lithium ion battery is tested.
The invention is described below with reference to a specific embodiment:
firstly, classifying the damage grades according to various abnormal phenomena occurring when the lithium ion battery fails, and dividing the damage grades of the lithium ion battery into a plurality of grades, including: if the lithium ion battery is exploded and is generally accompanied by shock waves, judging the hazard grade to be 7; if the lithium ion battery is not exploded but is exploded, and the internal components are violently sprayed out, the hazard grade is judged to be 6; if the lithium ion battery is not exploded or burst but has a fire or a flaming tongue, judging the hazard grade to be 5; if the lithium ion battery is not exploded or burst, and has no fire or flame tongue, but has mass loss conditions such as electrolyte leakage and the like, and the loss mass is more than or equal to 50% of the electrolyte mass, the damage grade is judged to be 4; if the lithium ion battery is not exploded or burst, and has no fire or flame front, but has mass loss conditions such as electrolyte leakage and the like, and the loss mass is less than 50% of the electrolyte mass, the damage grade is judged to be 3; if the lithium ion battery is not exploded or burst, and has no fire or flame tongue, electrolyte leakage occurs, but the mass of the leaked electrolyte is within the weighing precision of the electronic balance, and only the electrolyte leakage trace can be observed, the damage grade is judged to be 3; if the lithium ion battery is not exploded or burst, has no fire or fire tongue, has no electrolyte leakage, but the temperature rise is more than or equal to X ℃, the damage grade is judged to be 3; if the lithium ion battery is not exploded or burst, has no fire or fire tongue, has no electrolyte leakage, but has temperature rise less than X ℃, and the battery has irreversible damage and can not be repaired, the damage grade is judged to be 2; if the lithium ion battery is not exploded or burst, has no fire or flame tongue, has no electrolyte leakage, has temperature rise less than X ℃, and has reversible damage (with function loss but repairable), the damage grade is judged to be 1; if the lithium ion battery is not exploded or burst, no fire or fire tongue occurs, no electrolyte is leaked, the temperature rise is less than X ℃, and the battery has no influence, the hazard grade is judged to be 0. And then testing the lithium ion batteries, wherein 100 lithium ion batteries are selected for performance testing, an intelligent judgment system for the hazard level of the lithium ion batteries is used for judgment, and the judgment result is as shown in the following table.
| Grade | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Number of | 1 | 1 | 2 | 5 | 11 | 20 | 33 | 27 |
For the performance test, when the damage level is 2 or more, the test is not passed, the test needs to be stopped in time to prevent larger safety accidents, and the reason of abnormality is further analyzed, in the test result, the number of the lithium ion batteries with the damage level of 2 or more is 40, so the test of the 40 lithium ion batteries is not passed.
The working process of the intelligent lithium ion battery hazard grade judging system is as follows: when the performance test and the safety test are carried out on the lithium ion battery, the infrared temperature measurement module carries out temperature detection on the lithium ion battery in real time to obtain an infrared thermal image of the lithium ion battery, the infrared thermal image is stored in the data storage module, the camera module takes a picture of the lithium ion battery under test at regular intervals, for example, a picture is taken at intervals of 1s, the picture is stored in the data storage module, the quality detection module carries out quality measurement on the lithium ion battery in real time and stores the measured data in the data storage module, the main control module sends the data in the data storage module to the intelligent judgment module, the intelligent judgment module processes the obtained data, the temperature comparison unit carries out temperature reading on the infrared thermal image and compares the temperature with the value of X in the set temperature rise X ℃, and the image analysis unit carries out image analysis on the taken picture, the phenomenon of lithium ions in the testing process is obtained, the quality comparison unit compares the measured quality of the lithium ion battery with the set original quality of the lithium ion battery, the obtained result is stored in the data storage module, the main control module can judge the damage grade of the lithium ion battery according to the obtained temperature data, image data and quality data and by combining with the damage grade classification, and the judgment result is displayed on the display module.
For the safety performance test of the thermal stability of the battery, the temperature of the battery is gradually increased from 60 ℃ according to a certain temperature rise rate, and the hazard grades represented by different temperature ranges of the battery can be recorded in the whole process by the method and the system for judging the hazard grades of the battery, for example, when the temperature is increased to 100 ℃ and kept for 30-60 min, the battery in the first 30min shows no explosion and no explosion, no ignition and flame tongue and no leakage of electrolyte, but is not less than X ℃, the hazard grade is judged to be 3, the battery is continuously kept at 100 ℃ and starts to leak electrolyte, the hazard grade is judged to be 3, the temperature is continuously increased to 130 ℃, the leakage amount of the battery is more and more, the loss quality is not less than 50% of the electrolyte quality, and the hazard grade is judged to be 4 by upgrading; and continuously raising the temperature to 200 ℃, wherein the battery can generate fire or a fire tongue in the process, but the battery does not explode or burst, and the hazard grade is judged to be 5. And the change of the damage grade of the battery in the whole experiment process of the thermal stability test is comprehensively recorded by a damage grade judging system.
Claims (9)
1. A lithium ion battery hazard grade judging method is characterized by comprising the following steps:
s1: classifying the damage grades according to various abnormal phenomena occurring when the lithium ion battery fails;
s2: testing the lithium ion battery, and recording the phenomenon of the lithium ion battery after testing;
s3: performing hazard rating on the tested battery according to the hazard rating classification in the step S1 and the appearance of the tested battery in the step S2;
s4: according to the hazard level determination in step S3, a result of the determination of the hazard of the test of the tested lithium ion battery is given.
2. The lithium ion battery risk level determination method according to claim 1, wherein the risk level classification in step S1 includes: if the lithium ion battery explodes, the hazard grade is 7; if the lithium ion battery is not exploded and bursts, and the internal components are violently sprayed out, the hazard grade is 6; if the lithium ion battery is not exploded or burst, a fire or a fire tongue appears, and the hazard grade is 5; if the lithium ion battery is not exploded or burst, fire or fire tongue does not appear, the electrolyte leakage and other quality loss conditions occur, and the loss quality is more than or equal to 50% of the electrolyte quality, the damage grade is 4; if the lithium ion battery is not exploded or burst, and has no fire or flame front, and the electrolyte leakage and other quality loss conditions occur, and the loss quality is less than 50% of the electrolyte quality, the damage grade is 3; if the lithium ion battery is not exploded or burst, and fire or a flare tongue occurs, electrolyte leaks, the mass of the leaked electrolyte is within the weighing uncertainty of the electronic balance, and the electrolyte leakage trace can be observed, the damage grade is 3; if the lithium ion battery is not exploded or burst, fire and a fire tongue do not appear, the electrolyte is not leaked, and the temperature rise is more than or equal to X ℃, the hazard grade is 3; if the lithium ion battery is not exploded or burst, fire and a fire tongue do not appear, the electrolyte is not leaked, the temperature rise is less than X ℃, and the battery is irreversibly damaged, the damage grade is 2; if the lithium ion battery is not exploded or burst, fire and a fire tongue do not appear, electrolyte is not leaked, the temperature rise is less than X ℃, and the battery is reversibly damaged, the damage grade is 1; if the lithium ion battery is not exploded or burst, fire and a fire tongue do not appear, the electrolyte is not leaked, and the temperature rise is less than X ℃, the hazard grade is 0.
3. The method for judging the lithium ion battery hazard level according to claim 2, wherein the value of X in the temperature rise X ℃ is set by a manufacturer according to the requirement, and the value of X is the upper limit of the normal working temperature of the lithium ion battery.
4. The method as claimed in claim 1, wherein the test in step S2 includes a performance test and a safety test.
5. The lithium ion battery hazard classification method according to claim 2 or 4, wherein the irreversible damage comprises the following conditions:
1) irreversible damage to the battery structure by safety test and performance test;
2) the capacity loss of the tests such as storage, circulation and the like is more than a%, the direct-current internal resistance is increased by more than b%, and the self-discharge capacity loss is more than c%, wherein the values of a, b and c are values required by customers.
6. The lithium ion battery hazard level determination method according to claim 1, 2 or 4, wherein the performance test item is determined not to pass when a hazard level of 2 or more occurs; and when the hazard level is 5 or more in the safety test, the test item is judged not to pass.
7. An intelligent lithium ion battery hazard level judgment system is suitable for the lithium ion battery hazard level judgment method according to claim 1, and is characterized by comprising a main control module, wherein the main control module is respectively connected with a data storage module and an intelligent judgment module, and the data storage module is respectively connected with an infrared temperature measurement module, a camera module and a quality detection module.
8. The system according to claim 7, wherein the intelligent determination module comprises a temperature comparison unit, an image analysis unit and a quality comparison unit.
9. The lithium ion battery hazard class intelligent judgment system of claim 7 or 8, further comprising a display unit, wherein the display unit is connected with the main control module, and the work flow of the intelligent judgment system comprises the following steps:
q1: the infrared temperature measurement module, the camera module and the quality detection module are used for detecting the lithium ion battery under test in real time and storing the detected data in the data storage module;
q2: the main control module sends the data in the data storage module to the intelligent judgment module for processing, and the intelligent judgment module stores the processing result to the data storage module after processing is completed;
q3: the main control module completes the judgment of the hazard level of the lithium ion battery according to the processing result stored in the Q2 to the data storage module and by combining hazard level classification;
q4: and storing the judgment result of the hazard level of the lithium ion battery into a data storage module, and displaying the judgment result of the hazard level of the lithium ion battery on a display module.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842043A (en) * | 2016-12-28 | 2017-06-13 | 国联汽车动力电池研究院有限责任公司 | For the method for testing that lithium ion battery safe class is evaluated |
| US20180267108A1 (en) * | 2017-03-15 | 2018-09-20 | Kabushiki Kaisha Toshiba | Battery safety evaluation apparatus, battery control apparatus, battery safety evaluation method, non-transitory computer readable medium, control circuit and power storage system |
| CN109613056A (en) * | 2018-11-22 | 2019-04-12 | 清华大学 | The evaluation method of lithium ion battery fire risk |
| CN112327167A (en) * | 2020-10-21 | 2021-02-05 | 北京航空航天大学 | Battery capacity diving risk assessment method and system |
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2021
- 2021-06-30 CN CN202110736137.3A patent/CN113533972A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842043A (en) * | 2016-12-28 | 2017-06-13 | 国联汽车动力电池研究院有限责任公司 | For the method for testing that lithium ion battery safe class is evaluated |
| US20180267108A1 (en) * | 2017-03-15 | 2018-09-20 | Kabushiki Kaisha Toshiba | Battery safety evaluation apparatus, battery control apparatus, battery safety evaluation method, non-transitory computer readable medium, control circuit and power storage system |
| CN109613056A (en) * | 2018-11-22 | 2019-04-12 | 清华大学 | The evaluation method of lithium ion battery fire risk |
| CN112327167A (en) * | 2020-10-21 | 2021-02-05 | 北京航空航天大学 | Battery capacity diving risk assessment method and system |
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