A lithium battery pack management system

Abstract

The present invention discloses a lithium battery pack management system, which relates to the technical field of lithium battery management. By analyzing the working voltage corresponding to each lithium battery to be tested and calculating the operation evaluation coefficient corresponding to each lithium battery to be tested according to the battery internal resistance corresponding to each lithium battery to be tested, it is helpful to understand the operation state of the lithium battery and evaluate whether it meets the use requirements, and it is helpful to judge whether each lithium battery to be tested needs to meet the use requirements, so as to ensure the performance and safety of each battery to be tested. By testing each battery pack to be tested, defects and faults in each battery pack to be tested are found, and potential quality problems are prevented in advance, so as to improve the quality of the battery pack. By analyzing the reliability evaluation coefficient, it can be judged which battery packs to be tested meet the use requirements, that is, qualified battery packs, which is conducive to quickly screening out qualified battery packs with good performance and high reliability, and reducing the time and cost of selection and testing.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery management, and in particular to a lithium battery pack management system. Background Art

[0002] A lithium battery is an electrochemical device that uses the movement of lithium ions to store and release electrical energy. A battery pack is a combination of multiple lithium battery cells, which are generally connected in series or parallel to provide the required voltage and capacity. Lithium batteries are the basic building blocks of a battery pack, and a battery pack is a collection of multiple lithium battery cells. The battery pack is responsible for overall management and control of lithium battery cells to ensure their safety and performance stability. A lithium battery pack management system is a system that monitors, controls and protects the battery pack level. It is used to monitor battery cell voltage, current, temperature and other parameters, adjust the charge and discharge process, predict battery status, and take necessary protective measures.

[0003] At present, a lithium battery pack management system may have the following problems: 1. Currently, a small number of traditional lithium batteries have not undergone standard testing of the corresponding working voltage of the lithium batteries before being put into use. Lithium batteries that have not undergone standard testing have the problem of too high or too low working voltage. Excessive working voltage will cause the risk of battery overheating, fire or explosion, while too low working voltage will cause the battery to not work properly or its capacity will decrease. The safety performance test of the battery pack is as important as high temperature testing. The safety performance test of the battery pack includes evaluating its safety performance under short circuit, overcharge and over-discharge conditions under charging and discharging. If it has not undergone standard testing, the battery pack may create safety hazards when encountering abnormal conditions during use, such as overheating, fire or explosion.

[0004] 2. Before the lithium battery pack is assembled and put into use, it needs to be comprehensively evaluated. A battery pack that has not been comprehensively evaluated may not match the lithium battery, which will affect the normal operation of the entire lithium battery pack or reduce its performance. Summary of the invention

[0005] The purpose of the present invention is to provide a lithium battery pack management system that solves the problems existing in the background technology.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions: The present invention provides a lithium battery pack management system, including: an operating status test module, which is used to set up each voltage test group in a designated test field, and then place each lithium battery to be tested in each voltage test group in the designated test field for voltage testing, so as to collect the working voltage corresponding to each lithium battery to be tested in each voltage test group in the designated test field.

[0007] The operation status analysis module is used to obtain the battery internal resistance corresponding to each tested lithium battery from the lithium battery management manual, and calculate the operation evaluation coefficient corresponding to each lithium battery to be tested based on the working voltage corresponding to each lithium battery to be tested obtained from the test, thereby analyzing whether each lithium battery to be tested meets the use requirements, and recording each lithium battery to be tested that meets the use requirements as a qualified lithium battery.

[0008] The battery pack test module is used to set up each battery pack test group in the designated test field, and then put the battery pack to be tested in each battery pack test group in the designated test field for safety performance testing and high temperature testing, so as to collect the test information corresponding to each battery pack to be tested in each battery pack test group in the designated test field, and then calculate the comprehensive safety performance score corresponding to each lithium battery pack.

[0009] The battery pack analysis module is used to calculate the reliability assessment coefficient corresponding to each battery pack to be tested based on the test information corresponding to each battery pack to be tested, thereby analyzing whether each battery pack to be tested meets the usage requirements, and recording the battery packs to be tested that meet the usage requirements as qualified battery packs.

[0010] The comprehensive analysis module is used to assemble each qualified lithium battery and each qualified battery pack according to the operation evaluation coefficient corresponding to each qualified lithium battery and the reliability evaluation coefficient corresponding to each qualified battery pack, so as to obtain each lithium battery pack, and then calculate the comprehensive evaluation coefficient corresponding to each lithium battery pack, thereby analyzing whether each lithium battery pack meets the supporting assembly requirements.

[0011] The early warning terminal is used to issue early warning prompts when a certain lithium battery does not meet the usage requirements, a certain battery pack does not meet the usage requirements, and a certain lithium battery pack does not meet the supporting assembly requirements.

[0012] Preferably, the working voltage corresponding to each lithium battery to be tested in each voltage test group in the designated test field is collected, and the specific collection process is as follows: S1, each voltage test group is set in the designated test field based on standard atmospheric pressure and constant ambient temperature, and then each fully charged lithium battery to be tested is placed in each voltage test group;

[0013] S2. Discharge each fully charged lithium battery to be tested for a specified time, and then use voltmeters of the same specification to detect the voltage corresponding to the discharge process of each lithium battery to be tested. Record the voltage displayed by each voltmeter at each time point during the entire discharge process of each lithium battery to be tested according to preset time points, calculate the voltage corresponding to each lithium battery to be tested at each time point through the mean calculation to obtain the average voltage corresponding to each lithium battery to be tested, and use it as the working voltage corresponding to each lithium battery to be tested.

[0014] Preferably, the operation evaluation coefficient corresponding to each tested lithium battery is obtained by calculation, and the specific calculation process is as follows: Substitute the battery internal resistance and operating voltage corresponding to each tested lithium battery into the calculation formula The operation evaluation coefficient αi corresponding to each tested lithium battery is obtained, where i is the number corresponding to each lithium battery to be tested, i=1, 2, ..., n, and n is any integer greater than 2, wherein Ri and Pi represent the battery internal resistance and operating voltage corresponding to the i-th lithium battery to be tested, respectively, R′ and P′ are the set standard battery internal resistance and standard operating voltage, respectively, ΔR and ΔP are the set allowable battery internal resistance difference and allowable operating voltage difference, respectively, and ι1 and ι2 are the weight factors corresponding to the set battery internal resistance and the weight factors corresponding to the operating voltage, respectively.

[0015] Preferably, the analysis of whether each lithium battery to be tested meets the usage requirements is carried out as follows: the operation evaluation coefficient corresponding to each tested lithium battery is compared with the set operation evaluation coefficient range. If the operation evaluation coefficient corresponding to a certain tested lithium battery belongs to the set operation evaluation coefficient range, it is determined that the lithium battery to be tested meets the usage requirements; if the operation evaluation coefficient corresponding to a certain tested lithium battery does not belong to the set operation evaluation coefficient range, it is determined that the lithium battery to be tested does not meet the usage requirements, thereby analyzing whether each lithium battery to be tested meets the usage requirements.

[0016] Preferably, the test information corresponding to each battery pack to be tested in each battery pack test group in the designated test field is collected, and the specific collection process is as follows: A1, the test information includes the score corresponding to the overcharge problem handling capability of each battery pack to be tested, the score corresponding to the over-discharge problem handling capability, the score corresponding to the short-circuit handling capability and the maximum temperature that can be tolerated. In the designated test field, each battery pack test group is set based on standard atmospheric pressure and constant ambient temperature, and each battery pack test group is divided into each overcharge protection test group, each over-discharge protection test group, each short-circuit protection test group, and each high-temperature test group, and then each battery in each battery pack is assembled in series and placed in each battery pack test group, j is the number corresponding to each lithium battery to be tested, j=1, 2,..., m, m is any integer greater than 2.

[0017] A2. Select each overcharge protection test group. During the charging process, set a voltmeter of the same specification to detect the voltage change of each battery pack to be tested. When the corresponding power of each battery pack to be tested is fully charged, continue charging. Use an electronic stopwatch to record the time from the time when each battery pack to be tested is fully charged to the time when charging is stopped. According to the preset standard scoring table, the score corresponding to the overcharge problem handling ability of each battery pack to be tested is obtained, which is recorded as a. j ;

[0018] A3. Select each over-discharge protection test group. The battery packs to be tested in each over-discharge protection test group have been fully charged to meet the test requirements. The voltage changes corresponding to each battery pack to be tested are detected by setting a voltmeter of the same specification. During the discharge process of each battery pack to be tested, when the voltage corresponding to each battery pack to be tested reaches the safety voltage critical value corresponding to each battery pack to be tested, each battery pack to be tested stops discharging through over-discharge protection. The time from the moment when the voltage corresponding to each battery pack to be tested reaches the safety voltage critical value to the moment when the discharge is stopped is recorded by an electronic stopwatch. According to the preset standard scoring table, the score corresponding to the over-discharge problem handling capability of each battery pack to be tested is obtained, which is recorded as b. j ;

[0019] A4. Select each short-circuit protection test group, connect the positive end of each DC ammeter of the same specification to the positive electrode of each battery pack to be tested, connect the negative end to the positive end of the resistive load, and connect the negative end of the resistive load to the negative electrode of each battery pack to be tested. Introduce a short circuit on the resistive load, and achieve the short circuit by short-circuiting the connecting wires together. After the short circuit is introduced, observe the change in current. If the current increase exceeds the set safety value, it means that a short circuit has occurred in the circuit, and each battery pack to be tested is automatically powered off. Use an electronic stopwatch to record the time from the short circuit to the power-off time of each battery pack to be tested. According to the preset standard scoring table, the score corresponding to the short circuit handling capability of each battery pack to be tested is obtained, which is recorded as cj;

[0020] A5. Select each high-temperature test group, choose room temperature as the starting temperature, connect each battery pack to be tested to each voltmeter of the same specification, and gradually increase the temperature according to the preset temperature range. After each temperature increase, observe the voltage changes of each voltmeter. When the voltage of each voltmeter is lower than the preset voltage safety value, record the test temperature corresponding to each battery pack to be tested in each high-temperature test group, and use each test temperature as the maximum temperature that each battery pack to be tested can withstand.

[0021] Preferably, the calculation obtains the comprehensive safety performance score corresponding to each lithium battery pack, and the specific calculation process is as follows: according to the score corresponding to the overcharge problem handling ability of each battery pack to be tested, the score corresponding to the over-discharge problem handling ability of each battery pack to be tested, and the score corresponding to the short-circuit handling ability of each battery pack to be tested, the calculation formula is:

[0022] Get the comprehensive safety performance score of each lithium battery packξ j , where μ 1 , μ 2 , μ 3 They are respectively the weight factor corresponding to the score corresponding to the set overcharge problem handling capability, the weight factor corresponding to the score corresponding to the over-discharge problem handling capability, and the weight factor corresponding to the score corresponding to the short-circuit handling capability.

[0023] Preferably, the reliability evaluation coefficient corresponding to each battery pack to be tested is obtained by calculation, and the specific calculation process is as follows: the maximum temperature that each battery pack to be tested can withstand and the comprehensive safety performance score corresponding to each lithium battery pack are substituted into the calculation formula:

[0024] Get the reliability evaluation coefficient β corresponding to each lithium battery pack j , where T j , j They represent the maximum temperature and comprehensive safety performance score of the jth battery pack to be tested, respectively. T′ and ξ′ are the set standard maximum temperature and standard comprehensive safety performance score, respectively. ΔT and Δξ are the set allowable maximum temperature difference and allowable comprehensive safety performance score difference, respectively. η 1 , η 2 They are respectively the weight factor corresponding to the set maximum tolerable temperature and the weight factor corresponding to the comprehensive safety performance score.

[0025] Preferably, the calculation obtains the comprehensive evaluation coefficient corresponding to each lithium battery pack, and the specific calculation process is as follows: Substitute the operation evaluation coefficient corresponding to each qualified lithium battery and the reliability evaluation coefficient corresponding to each qualified battery pack into the calculation formula:

[0026] ψij=αi*λ1+βj*λ2, and the comprehensive evaluation coefficient ψij corresponding to each lithium battery pack is obtained, where λ1 and λ2 are the weight factors corresponding to the set operation evaluation coefficient and the weight factors corresponding to the reliability evaluation coefficient, respectively.

[0027] Preferably, the analysis of whether each lithium battery pack meets the matching assembly requirements is as follows: comparing the comprehensive evaluation coefficient corresponding to each lithium battery pack with a set comprehensive evaluation coefficient threshold; if the comprehensive evaluation coefficient corresponding to a lithium battery pack is greater than or equal to the set comprehensive evaluation coefficient threshold, then the lithium battery pack is determined to meet the matching assembly requirements; if the comprehensive evaluation coefficient corresponding to a lithium battery pack is less than the set comprehensive evaluation coefficient threshold, then the lithium battery pack is determined to not meet the matching assembly requirements, thereby analyzing whether each lithium battery pack meets the matching assembly requirements.

[0028] The beneficial effects of the present invention are: 1. A lithium battery pack management system provided by the present invention analyzes the operating voltage corresponding to each lithium battery to be tested, and calculates the operation evaluation coefficient corresponding to each lithium battery to be tested according to the battery internal resistance corresponding to each lithium battery to be tested, which is helpful to understand the operating status of the lithium battery and evaluate whether it meets the use requirements, and helps to determine whether each lithium battery to be tested needs to meet the use requirements, thereby ensuring the performance and safety of each battery to be tested. By testing each battery pack to be tested, defects and faults in each battery pack to be tested are discovered, and potential quality problems are prevented in advance, thereby improving the quality of the battery pack. By analyzing the reliability evaluation coefficient, it can be determined which battery packs to be tested meet the use requirements, that is, qualified battery packs, which is conducive to quickly screening out qualified battery packs with good performance and high reliability, and reducing the time and cost of selection and testing.

[0029] 2. The embodiment of the present invention achieves the best battery pairing and assembly configuration by assembling qualified lithium batteries and battery packs, and through the analysis of comprehensive evaluation coefficients, it can be determined whether each lithium battery pack meets the matching requirements, which helps to ensure the coordinated operation of the lithium battery packs in the entire system and improve the overall performance and stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a schematic diagram of the system structure connection of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1 As shown, the present invention provides a lithium battery pack management system, the method comprising: an operation status test module, an operation status analysis module, a battery pack test module, a battery pack analysis module, a comprehensive analysis module, and an early warning terminal.

[0034] The operating status test module is connected to the operating status analysis module, the operating status analysis module is connected to the battery pack test module, the battery pack test module is connected to the battery pack analysis module, the battery pack analysis module is connected to the comprehensive analysis module, and the comprehensive analysis module is connected to the early warning terminal.

[0035] The operation status test module is used to set up each voltage test group in the specified test field, and then put each lithium battery to be tested in each voltage test group in the specified test field for voltage testing, so as to collect the working voltage corresponding to each lithium battery to be tested in each voltage test group in the specified test field.

[0036] In a specific embodiment, the working voltage corresponding to each lithium battery to be tested in each voltage test group in the specified test field is collected, and the specific collection process is as follows: S1, each voltage test group is set in the specified test field based on standard atmospheric pressure and constant ambient temperature, and then each fully charged lithium battery to be tested is placed in each voltage test group;

[0037] S2. Discharge each fully charged lithium battery to be tested for a specified time, and then use voltmeters of the same specification to detect the voltage corresponding to the discharge process of each lithium battery to be tested. Record the voltage displayed by each voltmeter at each time point during the entire discharge process of each lithium battery to be tested according to preset time points, calculate the voltage corresponding to each lithium battery to be tested at each time point through the mean calculation to obtain the average voltage corresponding to each lithium battery to be tested, and use it as the working voltage corresponding to each lithium battery to be tested.

[0038] It should be noted that constant ambient temperature means that in a specific test or application scenario, the ambient temperature of each lithium battery to be tested remains stable and does not change significantly.

[0039] The operation status analysis module is used to obtain the battery internal resistance corresponding to each tested lithium battery from the lithium battery management manual, and calculate the operation evaluation coefficient corresponding to each lithium battery to be tested based on the working voltage corresponding to each lithium battery to be tested obtained from the test, thereby analyzing whether each lithium battery to be tested meets the use requirements, and recording each lithium battery to be tested that meets the use requirements as a qualified lithium battery.

[0040] In a specific embodiment, the operation evaluation coefficient corresponding to each tested lithium battery is obtained by calculation, and the specific calculation process is as follows: the battery internal resistance and operating voltage corresponding to each tested lithium battery are substituted into the calculation formula:

[0041] The operation evaluation coefficient αi corresponding to each tested lithium battery is obtained, where i is the number corresponding to each lithium battery to be tested, i=1, 2, ..., n, and n is any integer greater than 2, wherein Ri and Pi represent the battery internal resistance and operating voltage corresponding to the i-th lithium battery to be tested, respectively, R′ and P′ are the set standard battery internal resistance and standard operating voltage, respectively, ΔR and ΔP are the set allowable battery internal resistance difference and allowable operating voltage difference, respectively, and ι1 and ι2 are the weight factors corresponding to the set battery internal resistance and the weight factors corresponding to the operating voltage, respectively.

[0042] It should be noted that the values ​​of ι1 and ι2 are both greater than 0 and less than 1.

[0043] In a specific embodiment, the analysis of whether each lithium battery to be tested meets the usage requirements is as follows: the operation evaluation coefficient corresponding to each tested lithium battery is compared with the set operation evaluation coefficient interval. If the operation evaluation coefficient corresponding to a tested lithium battery belongs to the set operation evaluation coefficient interval, it is determined that the lithium battery to be tested meets the usage requirements. If the operation evaluation coefficient corresponding to a tested lithium battery does not belong to the set operation evaluation coefficient interval, it is determined that the lithium battery to be tested does not meet the usage requirements, thereby analyzing whether each lithium battery to be tested meets the usage requirements.

[0044] The battery pack test module is used to set up each battery pack test group in the designated test field, and then put the battery pack to be tested in each battery pack test group in the designated test field for safety performance testing and high temperature testing, so as to collect the test information corresponding to each battery pack to be tested in each battery pack test group in the designated test field, and then calculate the comprehensive safety performance score corresponding to each lithium battery pack.

[0045] In a specific embodiment, the test information corresponding to each battery pack to be tested in each battery pack test group in the designated test field is collected, and the specific collection process is as follows: A1, the test information includes the score corresponding to the overcharge problem handling capability of each battery pack to be tested, the score corresponding to the over-discharge problem handling capability, the score corresponding to the short-circuit handling capability and the maximum temperature that can be tolerated. In the designated test field, each battery pack test group is set based on standard atmospheric pressure and constant ambient temperature, and each battery pack test group is divided into each overcharge protection test group, each over-discharge protection test group, each short-circuit protection test group, and each high-temperature test group, and then each battery in each battery pack is assembled in series and placed in each battery pack test group, j is the number corresponding to each lithium battery to be tested, j=1, 2,..., m, m is any integer greater than 2

[0046] A2. Select each overcharge protection test group. During the charging process, set a voltmeter of the same specification to detect the voltage change of each battery pack to be tested. When the corresponding power of each battery pack to be tested is fully charged, continue charging. Use an electronic stopwatch to record the time from the time when each battery pack to be tested is fully charged to the time when charging is stopped. According to the preset standard scoring table, the score corresponding to the overcharge problem handling ability of each battery pack to be tested is obtained, which is recorded as a. j ;

[0047] A3. Select each over-discharge protection test group. The battery packs to be tested in each over-discharge protection test group have been fully charged to meet the test requirements. The voltage changes corresponding to each battery pack to be tested are detected by setting a voltmeter of the same specification. During the discharge process of each battery pack to be tested, when the voltage corresponding to each battery pack to be tested reaches the safety voltage critical value corresponding to each battery pack to be tested, each battery pack to be tested stops discharging through over-discharge protection. The time from the moment when the voltage corresponding to each battery pack to be tested reaches the safety voltage critical value to the moment when the discharge is stopped is recorded by an electronic stopwatch. According to the preset standard scoring table, the score corresponding to the over-discharge problem handling capability of each battery pack to be tested is obtained, which is recorded as b. j ;

[0048] A4. Select each short-circuit protection test group, connect the positive end of each DC ammeter of the same specification to the positive electrode of each battery pack to be tested, connect the negative end to the positive end of the resistive load, and connect the negative end of the resistive load to the negative electrode of each battery pack to be tested. Introduce a short circuit on the resistive load, and achieve the short circuit by short-circuiting the connecting wires together. After the short circuit is introduced, observe the change in current. If the current increase exceeds the set safety value, it means that a short circuit has occurred in the circuit, and each battery pack to be tested is automatically powered off. Use an electronic stopwatch to record the time from the short circuit to the power-off time of each battery pack to be tested. According to the preset standard scoring table, the score corresponding to the short circuit handling capability of each battery pack to be tested is obtained, which is recorded as cj;

[0049] A5. Select each high-temperature test group, choose room temperature as the starting temperature, connect each battery pack to be tested to each voltmeter of the same specification, and gradually increase the temperature according to the preset temperature range. After each temperature increase, observe the voltage changes of each voltmeter. When the voltage of each voltmeter is lower than the preset voltage safety value, record the test temperature corresponding to each battery pack to be tested in each high-temperature test group, and use each test temperature as the maximum temperature that each battery pack to be tested can withstand.

[0050] It should be noted that the standard scoring table has corresponding scoring criteria for the overcharge problem handling capability, over-discharge problem handling capability and short-circuit handling capability of each battery pack to be tested. The scoring criteria are based on the length of time it takes to handle the problem. The shorter the problem handling time, the higher the corresponding score. Therefore, based on the time between the time when each battery pack to be tested is fully charged and the time when charging is stopped, the time between the time when the voltage reaches the safety voltage critical value and the time when discharging is stopped, and the time between the time when a short circuit occurs and the time when power is cut off, the scores corresponding to the overcharge problem handling capability, the over-discharge problem handling capability and the short-circuit handling capability of each battery pack to be tested are obtained.

[0051] It should also be noted that the temperature is gradually increased according to the preset temperature range. After each temperature increase, it is necessary to wait for a period of time to allow the battery pack to adapt to the new temperature environment.

[0052] The battery pack analysis module is used to calculate the reliability assessment coefficient corresponding to each battery pack to be tested based on the test information corresponding to each battery pack to be tested, thereby analyzing whether each battery pack to be tested meets the usage requirements, and recording the battery packs to be tested that meet the usage requirements as qualified battery packs.

[0053] In a specific embodiment, the calculation obtains the comprehensive safety performance score corresponding to each lithium battery pack, and the specific calculation process is as follows: according to the score corresponding to the overcharge problem handling ability of each battery pack to be tested, the score corresponding to the over-discharge problem handling ability of each battery pack to be tested, and the score corresponding to the short-circuit handling ability of each battery pack to be tested, the calculation formula is:

[0054] Get the comprehensive safety performance score of each lithium battery packξ j , where μ 1 , μ 2 , μ 3 They are respectively the weight factor corresponding to the score corresponding to the set overcharge problem handling capability, the weight factor corresponding to the score corresponding to the over-discharge problem handling capability, and the weight factor corresponding to the score corresponding to the short-circuit handling capability.

[0055] It should be noted that μ 1 , μ 2 , μ 3 The value of is greater than 0 and less than 1.

[0056] In a specific embodiment, the reliability evaluation coefficient corresponding to each battery pack to be tested is obtained by calculation. The specific calculation process is as follows: Substitute the maximum temperature that each battery pack to be tested can withstand and the comprehensive safety performance score of each lithium battery pack into the calculation formula Get the reliability evaluation coefficient β corresponding to each lithium battery pack j, where T j , j They represent the maximum temperature and comprehensive safety performance score of the jth battery pack to be tested, respectively. T′ and ξ′ are the set standard maximum temperature and standard comprehensive safety performance score, respectively. ΔT and Δξ are the set allowable maximum temperature difference and allowable comprehensive safety performance score difference, respectively. η 1 , η 2 They are respectively the weight factor corresponding to the set maximum tolerable temperature and the weight factor corresponding to the comprehensive safety performance score.

[0057] It should be noted that η 1 , η 2 The value of is greater than 0 and less than 1.

[0058] The comprehensive analysis module is used to assemble each qualified lithium battery and each qualified battery pack according to the operation evaluation coefficient corresponding to each qualified lithium battery and the reliability evaluation coefficient corresponding to each qualified battery pack, so as to obtain each lithium battery pack, and then calculate the comprehensive evaluation coefficient corresponding to each lithium battery pack, thereby analyzing whether each lithium battery pack meets the supporting assembly requirements.

[0059] In a specific embodiment, the calculation obtains the comprehensive evaluation coefficient corresponding to each lithium battery pack, and the specific calculation process is as follows: Substitute the operation evaluation coefficient corresponding to each qualified lithium battery and the reliability evaluation coefficient corresponding to each qualified battery pack into the calculation formula: ψij=αi*λ1+βj*λ2 to obtain the comprehensive evaluation coefficient ψij corresponding to each lithium battery pack, wherein λ1 and λ2 are the weight factors corresponding to the set operation evaluation coefficient and the weight factors corresponding to the reliability evaluation coefficient, respectively.

[0060] It should be noted that the values ​​of λ1 and λ2 are both greater than 0 and less than 1.

[0061] In a specific embodiment, the analysis of whether each lithium battery pack meets the matching assembly requirements is as follows: the comprehensive evaluation coefficient corresponding to each lithium battery pack is compared with a set comprehensive evaluation coefficient threshold. If the comprehensive evaluation coefficient corresponding to a lithium battery pack is greater than or equal to the set comprehensive evaluation coefficient threshold, it is determined that the lithium battery pack meets the matching assembly requirements. If the comprehensive evaluation coefficient corresponding to a lithium battery pack is less than the set comprehensive evaluation coefficient threshold, it is determined that the lithium battery pack does not meet the matching assembly requirements, thereby analyzing whether each lithium battery pack meets the matching assembly requirements.

[0062] The embodiment of the present invention achieves the best battery pairing and assembly configuration by assembling qualified lithium batteries and battery packs, and through the analysis of comprehensive evaluation coefficients, it can determine whether each lithium battery pack meets the matching requirements, which helps to ensure the coordinated operation of the lithium battery packs in the entire system and improve the overall performance and stability of the system.

[0063] The early warning terminal is used to issue early warning prompts when a certain lithium battery does not meet the usage requirements, a certain battery pack does not meet the usage requirements, and a certain lithium battery pack does not meet the supporting assembly requirements.

[0064] It should be noted that by sending early warning messages to relevant personnel, these messages are sent to mobile phones, emails and other communication tools to remind recipients to pay attention to lithium batteries and battery packs that do not meet the requirements, so as to achieve the purpose of early warning.

[0065] A lithium battery pack management system provided by the present invention analyzes the operating voltage corresponding to each lithium battery to be tested and calculates the operation evaluation coefficient corresponding to each lithium battery to be tested based on the battery internal resistance corresponding to each lithium battery to be tested. This helps to understand the operating status of the lithium battery and evaluate whether it meets the use requirements. It helps to determine whether each lithium battery to be tested needs to meet the use requirements, thereby ensuring the performance and safety of each battery to be tested. By testing each battery pack to be tested, defects and faults in each battery pack to be tested are discovered, and potential quality problems are prevented in advance, thereby improving the quality of the battery pack. By analyzing the reliability evaluation coefficient, it can be determined which battery packs to be tested meet the use requirements, that is, qualified battery packs, which is conducive to quickly screening out qualified battery packs with good performance and high reliability, and reducing the time and cost of selection and testing.

[0066] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined in this specification, they shall all fall within the protection scope of the present invention.

Claims

1. A lithium battery pack management system, characterized in that: include: The operation status test module is used to set each voltage test group in the specified test field, and then put each lithium battery to be tested in each voltage test group in the specified test field for voltage testing, so as to collect the working voltage corresponding to each lithium battery to be tested in each voltage test group in the specified test field; The operation status analysis module is used to obtain the battery internal resistance corresponding to each tested lithium battery from the lithium battery management manual, and calculate the operation evaluation coefficient corresponding to each tested lithium battery according to the working voltage corresponding to each tested lithium battery obtained by the test, thereby analyzing whether each tested lithium battery meets the use requirements, and recording each tested lithium battery that meets the use requirements as a qualified lithium battery; The calculation results in the operation evaluation coefficient corresponding to each tested lithium battery. The specific calculation process is as follows: Substitute the battery internal resistance and operating voltage corresponding to each tested lithium battery into the calculation formula Obtaining the operation evaluation coefficient αi corresponding to each tested lithium battery, where i is the number corresponding to each lithium battery to be tested, i=1, 2, ..., n, and n is any integer greater than 2, wherein Ri and Pi represent the battery internal resistance and operating voltage corresponding to the i-th lithium battery to be tested, respectively, R′ and P′ represent the set standard battery internal resistance and standard operating voltage, respectively, ΔR and ΔP represent the set allowable battery internal resistance difference and allowable operating voltage difference, respectively, and ι1 and ι2 represent the weight factor corresponding to the set battery internal resistance and the weight factor corresponding to the operating voltage, respectively; The battery pack test module is used to set up each battery pack test group in the designated test field, and then put the battery pack to be tested into each battery pack test group in the designated test field for safety performance test and high temperature test, so as to collect the test information corresponding to each battery pack to be tested in each battery pack test group in the designated test field, and then calculate the comprehensive safety performance score corresponding to each lithium battery pack; The specific collection process of collecting the test information corresponding to each battery pack to be tested in each battery pack test group in the designated test field is as follows: A1. The test information includes the scores corresponding to the overcharge problem handling capability, the over-discharge problem handling capability, the short-circuit handling capability and the maximum temperature that can be tolerated of each battery pack to be tested. Each battery pack test group is set up in a designated test field based on standard atmospheric pressure and constant ambient temperature, and each battery pack test group is divided into each overcharge protection test group, each over-discharge protection test group, each short-circuit protection test group and each high-temperature test group. Then, each battery in each battery pack is assembled in series and placed in each battery pack test group. j is the number corresponding to each lithium battery to be tested, j=1, 2, ..., m, and m is any integer greater than 2. A2. Select each overcharge protection test group. During the charging process, set a voltmeter of the same specification to detect the voltage change of each battery pack to be tested. When the corresponding power of each battery pack to be tested is fully charged, continue charging. Use an electronic stopwatch to record the time from the time when each battery pack to be tested is fully charged to the time when charging is stopped. According to the preset standard scoring table, the score corresponding to the overcharge problem handling ability of each battery pack to be tested is obtained, which is recorded as a. j ; A3. Select each over-discharge protection test group. The battery packs to be tested in each over-discharge protection test group have been fully charged to meet the test requirements. The voltage changes corresponding to each battery pack to be tested are detected by setting a voltmeter of the same specification. During the discharge process of each battery pack to be tested, when the voltage corresponding to each battery pack to be tested reaches the safety voltage critical value corresponding to each battery pack to be tested, each battery pack to be tested stops discharging through over-discharge protection. The time from the moment when the voltage corresponding to each battery pack to be tested reaches the safety voltage critical value to the moment when the discharge is stopped is recorded by an electronic stopwatch. According to the preset standard scoring table, the score corresponding to the over-discharge problem handling capability of each battery pack to be tested is obtained, which is recorded as b. j ; A4. Select each short-circuit protection test group, connect the positive end of each DC ammeter of the same specification to the positive electrode of each battery pack to be tested, connect the negative end to the positive end of the resistive load, and connect the negative end of the resistive load to the negative electrode of each battery pack to be tested. Introduce a short circuit on the resistive load, and achieve the short circuit by short-circuiting the connecting wires together. After the short circuit is introduced, observe the change in current. If the current increase exceeds the set safety value, it means that a short circuit has occurred in the circuit, and each battery pack to be tested is automatically powered off. Use an electronic stopwatch to record the time from the short circuit to the power-off time of each battery pack to be tested. According to the preset standard scoring table, the score corresponding to the short circuit handling capability of each battery pack to be tested is obtained, which is recorded as cj; A5. Select each high temperature test group, choose room temperature as the starting temperature, connect each battery pack to be tested to each voltmeter of the same specification, and gradually increase the temperature according to the preset temperature range. After each temperature increase, observe the voltage change of each voltmeter. When the voltage of each voltmeter is lower than the preset voltage safety value, record the test temperature corresponding to each battery pack to be tested in each high temperature test group, and use each test temperature as the maximum temperature that each battery pack to be tested can withstand. The calculation obtains the comprehensive safety performance score corresponding to each lithium battery pack, and the specific calculation process is as follows: According to the scores corresponding to the overcharge problem handling ability of each battery pack to be tested, the scores corresponding to the over-discharge problem handling ability of each battery pack to be tested, and the scores corresponding to the short-circuit handling ability of each battery pack to be tested, the formula is calculated. Get the comprehensive safety performance score of each lithium battery packξ j , where μ1, μ2, and μ3 are the weight factors corresponding to the scores of the overcharge problem handling capability, the over-discharge problem handling capability, and the short-circuit handling capability, respectively; A battery pack analysis module is used to calculate the reliability evaluation coefficient of each battery pack to be tested according to the test information corresponding to each battery pack to be tested, thereby analyzing whether each battery pack to be tested meets the use requirements, and recording each battery pack to be tested that meets the use requirements as a qualified battery pack; The reliability evaluation coefficient corresponding to each battery pack to be tested is obtained by calculation, and the specific calculation process is as follows: Substitute the maximum temperature that each battery pack to be tested can withstand and the comprehensive safety performance score of each lithium battery pack into the calculation formula Get the reliability evaluation coefficient β corresponding to each lithium battery pack j , where T j , j They represent the maximum temperature that can be tolerated and the comprehensive safety performance score of the jth battery pack to be tested, respectively; T′ and ξ′ are the set standard maximum temperature that can be tolerated and the standard comprehensive safety performance score, respectively; ΔT and Δξ are the set permissible maximum temperature difference and the permissible comprehensive safety performance score difference, respectively; η1 and η2 are the weight factors corresponding to the set maximum temperature that can be tolerated and the weight factors corresponding to the comprehensive safety performance score, respectively; The comprehensive analysis module is used to assemble each qualified lithium battery and each qualified battery pack according to the operation evaluation coefficient corresponding to each qualified lithium battery and the reliability evaluation coefficient corresponding to each qualified battery pack, so as to obtain each lithium battery pack, and then calculate the comprehensive evaluation coefficient corresponding to each lithium battery pack, thereby analyzing whether each lithium battery pack meets the supporting assembly requirements.

2. A lithium battery pack management system according to claim 1, characterized in that: The specific collection process of collecting the working voltage corresponding to each lithium battery to be tested in each voltage test group in the specified test field is as follows: S1. Setting up each voltage test group in a designated test field based on standard atmospheric pressure and constant ambient temperature, and then placing each fully charged lithium battery to be tested into each voltage test group; S2. Discharge each fully charged lithium battery to be tested for a specified time, and then use voltmeters of the same specification to detect the voltage corresponding to the discharge process of each lithium battery to be tested. Record the voltage displayed by each voltmeter at each time point during the entire discharge process of each lithium battery to be tested according to preset time points, calculate the voltage corresponding to each lithium battery to be tested at each time point through the mean calculation to obtain the average voltage corresponding to each lithium battery to be tested, and use it as the working voltage corresponding to each lithium battery to be tested.

3. A lithium battery pack management system according to claim 2, characterized in that: The specific analysis process of analyzing whether each lithium battery to be tested meets the use requirements is as follows: The operation evaluation coefficient corresponding to each tested lithium battery is compared with the set operation evaluation coefficient range. If the operation evaluation coefficient corresponding to a tested lithium battery belongs to the set operation evaluation coefficient range, it is determined that the lithium battery to be tested meets the usage requirements. If the operation evaluation coefficient corresponding to a tested lithium battery does not belong to the set operation evaluation coefficient range, it is determined that the lithium battery to be tested does not meet the usage requirements, so as to analyze whether each lithium battery to be tested meets the usage requirements.

4. A lithium battery pack management system according to claim 3, characterized in that: The calculation obtains the comprehensive evaluation coefficient corresponding to each lithium battery pack, and the specific calculation process is as follows: Substitute the operation evaluation coefficient corresponding to each qualified lithium battery and the reliability evaluation coefficient corresponding to each qualified battery pack into the calculation formula ψij=αi*λ1+βj*λ2 to obtain the comprehensive evaluation coefficient ψij corresponding to each lithium battery pack, where λ1 and λ2 are the weight factors corresponding to the set operation evaluation coefficient and the weight factors corresponding to the reliability evaluation coefficient, respectively.

5. A lithium battery pack management system according to claim 4, characterized in that: The specific analysis process of analyzing whether each lithium battery pack meets the supporting assembly requirements is as follows: The comprehensive evaluation coefficient corresponding to each lithium battery pack is compared with the set comprehensive evaluation coefficient threshold. If the comprehensive evaluation coefficient corresponding to a lithium battery pack is greater than or equal to the set comprehensive evaluation coefficient threshold, the lithium battery pack is judged to meet the matching assembly requirements. If the comprehensive evaluation coefficient corresponding to a lithium battery pack is less than the set comprehensive evaluation coefficient threshold, the lithium battery pack is judged to not meet the matching assembly requirements, so as to analyze whether each lithium battery pack meets the matching assembly requirements.

6. A lithium battery pack management system according to claim 1, characterized in that: It also includes an early warning terminal, which is used to issue early warning prompts when a certain lithium battery does not meet the usage requirements, a certain battery pack does not meet the usage requirements, and a certain lithium battery pack does not meet the matching assembly requirements.

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