A battery formation test system

Abstract

The present invention discloses a battery formation test system, and relates to the technical field of test systems. A monitoring module is responsible for monitoring relevant parameters that affect test results, and a threshold value is set for the relevant parameters. When a certain parameter exceeds the threshold value, an alarm prompt is issued. A control module is responsible for controlling the operation of the entire test system, and according to the data collected by the data acquisition module, the operation of the charge-discharge power supply is controlled to realize functions such as charge-discharge cycles. After the test is completed, the test termination information is sent to the evaluation module. After the evaluation module receives the test termination information, an evaluation mechanism is established through relevant parameters, and it is determined whether it is necessary to conduct the test again according to the evaluation mechanism, so that after the test is completed, it can be determined whether the test process meets the standard. If it does not meet the standard, it is necessary to continue the test. When conducting the test, the present invention needs to reach the standard until the test process meets the standard, so as to ensure the accuracy and reliability of the battery formation test data.

Description

Technical Field

[0001] The invention relates to the technical field of test systems, and in particular to a battery formation test system. Background Art

[0002] The battery formation test system is an experimental system used to study the chemical reactions and evaluate the performance of the battery during the charging and discharging process. During the battery formation process, the battery will undergo the process of charging and discharging, and the chemical reactions in these processes will directly affect the performance of the battery.

[0003] Therefore, understanding and controlling these chemical reactions is crucial for battery research and development. The battery formation test system can help researchers gain a deeper understanding of the battery's chemical reaction process and performance by monitoring the battery's current, voltage, temperature and other parameters during the charge and discharge process, as well as sampling and testing the battery, thereby optimizing the battery's design and manufacturing and improving its energy density, cycle life and other performance indicators.

[0004] The prior art has the following deficiencies:

[0005] Since the measurement accuracy of the battery formation test system is affected by many factors, such as thermal runaway of the battery, environmental factors, etc., these factors will cause large errors in the test results. After the existing battery formation test system performs a formation test on the battery, there is no evaluation and processing of the entire test process, resulting in poor accuracy and low reliability of the test data. Summary of the invention

[0006] The purpose of the present invention is to provide a battery formation test system to solve the shortcomings of the background technology.

[0007] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: a battery formation test system, comprising a power module, a monitoring module, a data acquisition module, a control module, and an evaluation module;

[0008] Power module: provides charging and discharging power for the battery, and controls the current and voltage during the charging and discharging process;

[0009] Monitoring module: monitors the relevant parameters that affect the test results and sets thresholds for the relevant parameters. When a parameter exceeds the threshold, an alarm is issued;

[0010] Data acquisition module: collects the current and voltage data of the battery during the charging and discharging process;

[0011] Control module: controls the operation of the test system, and controls the operation of the charging and discharging power supply according to the data collected by the data acquisition module. After the test is completed, the test termination information is generated;

[0012] Evaluation module: After receiving the test termination information, an evaluation mechanism is established through relevant parameters, and based on the evaluation mechanism, it is determined whether another test is needed.

[0013] In a preferred embodiment, the monitoring module includes a monitoring unit, a comparison unit and an alarm unit. The monitoring unit monitors relevant parameters that affect the test results. After the comparison unit sets corresponding thresholds for the relevant parameters, the relevant parameters are compared with the thresholds. The alarm unit determines whether to issue an alarm based on the comparison results of the relevant parameters and the thresholds.

[0014] In a preferred embodiment, the monitoring unit monitors relevant parameters that affect the test results, including battery parameters and environmental parameters. The battery parameters include the battery temperature fluctuation coefficient and the change in the battery positive electrode structure. The environmental parameters include the ambient temperature fluctuation amplitude.

[0015] In a preferred embodiment, the comparison unit sets a floating threshold, a change threshold and a fluctuation threshold for the battery temperature floating coefficient, the change in the battery positive electrode structure and the ambient temperature fluctuation amplitude, and compares the battery temperature floating coefficient, the change in the battery positive electrode structure and the ambient temperature fluctuation amplitude with the floating threshold, the change threshold and the fluctuation threshold, respectively.

[0016] In a preferred embodiment, the alarm unit issues an alarm when the battery temperature floating coefficient is greater than the battery temperature floating coefficient, issues an alarm when the change in the battery positive electrode structure is greater than a change threshold, and issues an alarm when the ambient temperature fluctuation amplitude is greater than a fluctuation threshold.

[0017] In a preferred embodiment, the evaluation module includes a calculation unit and a judgment unit. The calculation unit comprehensively analyzes the battery temperature fluctuation coefficient, the change in the battery positive electrode structure and the ambient temperature fluctuation amplitude, and establishes the evaluation coefficient through a formula.

[0018] In a preferred embodiment, the battery temperature fluctuation coefficient fd c The calculation expression is: Where W(t) is the real-time temperature inside the battery, [t x , t y ] is the battery thermal runaway warning period, [t w , t g ] is the period of battery heat dissipation warning, and the battery temperature floating coefficient is inversely proportional to the evaluation coefficient.

[0019] In a preferred embodiment, the battery positive electrode structure change bh c The calculation expression is: bh c=-yF((E^o(LiCoO2)-E^o(LiyCoO2)) / z), where y represents the amount of lithium ion insertion, F represents the Faraday constant, z represents the charge number of the inserted ion, E^o(LiCoO2) and E^o(LiyCoO2) represent the standard potentials of LiCoO2 and LiyCoO2 respectively, and the change in the positive electrode structure of the battery bh c It is inversely proportional to the evaluation coefficient.

[0020] In a preferred embodiment, the ambient temperature fluctuation amplitude bd h The calculation expression is: The test environment temperature range of the battery formation test system is marked as wd min ~wd max The ambient temperature is collected in real time through the temperature sensor set on the test bench, marked as wd h , when wd h >wd max When the ambient temperature fluctuation amplitude bd h =|wd h -wd max |, when wd h <wd min When the ambient temperature fluctuation amplitude bd h =|wb h -wb min |, the ambient temperature fluctuation amplitude is inversely proportional to the evaluation coefficient.

[0021] In a preferred embodiment, the judgment unit is used to set the evaluation threshold pg z , in obtaining the evaluation coefficient pg x After that, the evaluation coefficient pg x With the evaluation threshold pg z Make a comparison;

[0022] If the evaluation coefficient pg x <Evaluation threshold pg z During the test, the test was affected by a combination of factors, which resulted in inaccurate test data. The test needs to be repeated. After the subsequent test, it needs to be evaluated again until the evaluation coefficient pg x ≥ evaluation threshold pg z The test is then stopped and the test data is taken as the final result. If the evaluation coefficient pg of five consecutive tests is x Both are less than the evaluation threshold pg z , then the judgment unit sends out a warning signal, and after receiving the warning signal, the management personnel need to adjust the test environment and test equipment;

[0023] If the evaluation coefficient pg x ≥ evaluation threshold pg z, judge that the test meets the standards and output the test data.

[0024] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0025] 1. The present invention is responsible for monitoring the relevant parameters that affect the test results through the monitoring module, and setting thresholds for the relevant parameters. When a certain parameter exceeds the threshold, an alarm prompt is issued. The control module is responsible for controlling the operation of the entire test system, and according to the data collected by the data acquisition module, controls the operation of the charge and discharge power supply to achieve functions such as charge and discharge cycles. After the test is completed, the test termination information is sent to the evaluation module. After receiving the test termination information, the evaluation module establishes an evaluation mechanism through relevant parameters, and determines whether it is necessary to conduct the test again based on the evaluation mechanism, so that after the test is completed, it can be determined whether the test process meets the standards. If not, it is necessary to continue the test until the test process meets the standards, thereby ensuring the accuracy and reliability of the battery formation test data;

[0026] 2. The present invention collects the battery temperature floating coefficient, the battery positive electrode structure change and the ambient temperature fluctuation amplitude through the monitoring unit. When the battery temperature floating coefficient is greater than the battery temperature floating coefficient, the alarm unit issues an alarm prompt; when the battery positive electrode structure change is greater than the change threshold, the alarm unit issues an alarm prompt; when the ambient temperature fluctuation amplitude is greater than the fluctuation threshold, the alarm unit issues an alarm prompt, and then the battery temperature floating coefficient, the battery positive electrode structure change and the ambient temperature fluctuation amplitude are comprehensively analyzed to establish an evaluation coefficient, thereby improving data processing efficiency, and judging whether re-testing is needed based on the comparison result between the evaluation coefficient and the evaluation threshold, thereby effectively ensuring the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is a system module diagram of the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0030] Example 1: Please refer to Figure 1 As shown, a battery formation test system described in this embodiment includes a power module, a monitoring module, a data acquisition module, a control module, and an evaluation module;

[0031] in:

[0032] The power module is responsible for providing charging and discharging power for the battery and controlling the current and voltage during the charging and discharging process. The monitoring module is responsible for monitoring the relevant parameters that affect the test results and setting thresholds for the relevant parameters. When a parameter exceeds the threshold, an alarm is issued and the relevant parameters are sent to the evaluation module. The data acquisition module is responsible for collecting the current, voltage and other data of the battery during the charging and discharging process and transmitting the data to the control module. The control module is responsible for controlling the operation of the entire test system and controlling the operation of the charging and discharging power supply according to the data collected by the data acquisition module to realize functions such as charging and discharging cycles. After the test is completed, the test termination information is sent to the evaluation module. After receiving the test termination information, the evaluation module establishes an evaluation mechanism through relevant parameters and determines whether the test needs to be conducted again based on the evaluation mechanism.

[0033] This application uses a monitoring module to monitor relevant parameters that affect the test results and set thresholds for relevant parameters. When a parameter exceeds the threshold, an alarm is issued. The control module is responsible for controlling the operation of the entire test system and controlling the operation of the charge and discharge power supply based on the data collected by the data acquisition module to achieve functions such as charge and discharge cycles. After the test is completed, the test termination information is sent to the evaluation module. After receiving the test termination information, the evaluation module establishes an evaluation mechanism through relevant parameters and determines whether it is necessary to conduct the test again based on the evaluation mechanism. After the test is completed, it can be determined whether the test process meets the standards. If not, the test needs to be continued until the test process meets the standards, thereby ensuring the accuracy and reliability of the battery formation test data.

[0034] In this embodiment, the power module is responsible for providing charging and discharging power to the battery, and controlling the current and voltage during the charging and discharging process includes the following steps:

[0035] 1) Set the charge and discharge current and voltage: Set the charge and discharge current and voltage parameters of the power module according to the experimental requirements and battery characteristics;

[0036] 2) Monitor current and voltage: During the charging and discharging process, the power module needs to monitor the current and voltage changes of the battery in real time and adjust them according to the set values;

[0037] 3) Control the charge and discharge current and voltage: By adjusting the output current and voltage of the power module, the current and voltage during the battery charge and discharge process can be controlled;

[0038] 4) Real-time recording of current and voltage changes: The power module needs to record the current and voltage changes of the battery in real time and transmit the data to the control module for processing and analysis.

[0039] The data acquisition module is responsible for collecting the current, voltage and other data of the battery during the charging and discharging process, including the following steps:

[0040] 1) Select appropriate sensors: The data acquisition module needs to select appropriate sensors to measure battery current, voltage and other parameters according to the characteristics of the battery and experimental requirements;

[0041] 2) Measure current and voltage: During the charging and discharging process, the data acquisition module needs to measure the current and voltage of the battery in real time, and collect and store the data.

[0042] The control module is responsible for controlling the operation of the entire test system, and controls the operation of the charge and discharge power supply according to the data collected by the data acquisition module to realize the functions of charge and discharge cycle, including the following steps:

[0043] 1) Setting experimental parameters: The control module needs to set experimental parameters such as charge and discharge current, voltage, capacity, etc. according to the experimental requirements and battery characteristics;

[0044] 2) Control power supply: According to the set experimental parameters, the control module needs to adjust the current, voltage and other parameters of the charge and discharge power supply to achieve the charge and discharge cycle of the battery;

[0045] 3) Real-time monitoring of battery status: The control module needs to monitor the battery status in real time, such as current, voltage and other parameters, so as to adjust the working status of the charging and discharging power supply in time to ensure the accuracy and stability of the charging and discharging process;

[0046] 4) Control the charge and discharge cycle: The control module needs to control the operation of the charge and discharge power supply according to the set charge and discharge parameters to achieve the charge and discharge cycle;

[0047] 5) Real-time recording of test data: The control module needs to record the data collected during the charging and discharging process in real time, such as current, voltage and other parameters, for subsequent data processing and analysis.

[0048] Embodiment 2: The monitoring module is responsible for monitoring the relevant parameters that affect the test results and setting thresholds for the relevant parameters. When a parameter exceeds the threshold, an alarm is issued and the relevant parameters are sent to the evaluation module.

[0049] The monitoring module includes a monitoring unit, a comparison unit and an alarm unit;

[0050] Monitoring unit: used to monitor the relevant parameters that affect the test results, including battery parameters and environmental parameters. Battery parameters include battery temperature fluctuation coefficient and battery positive electrode structure change. Environmental parameters include ambient temperature fluctuation amplitude.

[0051] Comparison unit: setting a floating threshold, a change threshold and a fluctuation threshold for the battery temperature floating coefficient, the battery positive electrode structure change and the ambient temperature fluctuation amplitude, and comparing the battery temperature floating coefficient, the battery positive electrode structure change and the ambient temperature fluctuation amplitude with the floating threshold, the change threshold and the fluctuation threshold respectively;

[0052] Alarm unit: When the battery temperature floating coefficient is greater than the battery temperature floating coefficient, the alarm unit issues an alarm prompt; when the change in the battery positive electrode structure is greater than the change threshold, the alarm unit issues an alarm prompt; when the ambient temperature fluctuation amplitude is greater than the fluctuation threshold, the alarm unit issues an alarm prompt.

[0053] In the above scheme, when the battery formation test system is carried out, a floating threshold, a change threshold and a fluctuation threshold are set for the battery temperature floating coefficient, the battery positive electrode structure change and the ambient temperature fluctuation amplitude, respectively, and a comparison result of the battery temperature floating coefficient, the battery positive electrode structure change and the ambient temperature fluctuation amplitude with the floating threshold, the change threshold and the fluctuation threshold is used to determine whether to issue an alarm;

[0054] However, in actual situations, when the three parameters of battery temperature fluctuation coefficient, battery positive electrode structure change and ambient temperature fluctuation amplitude change at the same time, even if the battery temperature fluctuation coefficient, battery positive electrode structure change and ambient temperature fluctuation amplitude do not exceed the set threshold, it will also affect the test data of the battery formation test system, thereby affecting the test accuracy. Therefore, we propose the following solution:

[0055] After receiving the test termination information, the evaluation module establishes an evaluation mechanism through relevant parameters and determines whether it is necessary to conduct the test again based on the evaluation mechanism.

[0056] The evaluation module includes a calculation unit and a judgment unit;

[0057] Calculation unit: After comprehensive analysis of the battery temperature fluctuation coefficient, the change in the battery positive electrode structure, and the ambient temperature fluctuation amplitude, an evaluation coefficient is established through a formula. The expression is:

[0058]

[0059] In the formula, pg x is the evaluation coefficient, C is the error correction coefficient, and C is 1.665, fd c is the battery temperature fluctuation coefficient, bh cis the change in the structure of the battery positive electrode, bd h is the ambient temperature fluctuation amplitude, α and β are the proportional coefficients of battery parameters and environmental parameters respectively, and α>β>0.

[0060] Battery temperature fluctuation coefficient fd c The calculation expression is: Where W(t) is the real-time temperature inside the battery, [t x , t y ] is the battery thermal runaway warning period, [t w , t g ] is the period of battery heat dissipation warning, and the period of battery thermal runaway warning is the period of abnormal battery internal temperature acquisition, that is, the system obtains abnormal battery internal temperature data. When the battery temperature is thermal runaway and heat dissipation warning occurs, it will affect the accuracy of the system's internal temperature data obtained by the battery, and cause the battery temperature to rise and affect the test data. Therefore, the battery temperature floating coefficient is inversely proportional to the evaluation coefficient.

[0061] Battery positive electrode structure change bh c The calculation expression is: bh c =-yF((E^o(LiCoO2)-E^o(LiyCoO2)) / z), where y represents the amount of lithium ion insertion, F represents the Faraday constant, z represents the charge number of the inserted ion, E^o(LiCoO2) and E^o(LiyCoO2) represent the standard potentials of LiCoO2 and LiyCoO2 respectively. When the positive electrode material structure changes too much, it may lead to a decrease in battery capacity, thereby affecting the battery performance and test data. Therefore, the battery positive electrode structure change bh c It is inversely proportional to the evaluation coefficient.

[0062] Ambient temperature fluctuation amplitude bd h The calculation expression is: The test environment temperature range of the battery formation test system is marked as wd min ~wd max The ambient temperature is collected in real time through the temperature sensor set on the test bench, marked as wd h , when wd h >wd max When the ambient temperature fluctuation amplitude bd h =|wd h -wd max |, when wd h <wd min When the ambient temperature fluctuation amplitude bd h =|wb h -wb min|, since too high or too low ambient temperature will affect the test results of the battery formation test system, the ambient temperature fluctuation amplitude is inversely proportional to the evaluation coefficient.

[0063] Judgment unit: used to set the evaluation threshold pg z , in obtaining the evaluation coefficient pg x After that, the evaluation coefficient pg x With the evaluation threshold pg z The comparison results are as follows:

[0064] If the evaluation coefficient pg x <Evaluation threshold pg z During the test, the test was affected by a combination of factors, which resulted in inaccurate test data. The test needs to be repeated. After the subsequent test, it needs to be evaluated again until the evaluation coefficient pg x ≥ evaluation threshold pg z The test is then stopped and the test data is taken as the final result. If the evaluation coefficient pg of five consecutive tests is x Both are less than the evaluation threshold pg z , the judgment unit sends out a warning signal. After receiving the warning signal, the management personnel need to adjust the test environment and test equipment.

[0065] If the evaluation coefficient pg x ≥ evaluation threshold pg z , judge that the test meets the standards and output the test data.

[0066] The present application collects the battery temperature floating coefficient, the battery positive electrode structure change and the ambient temperature fluctuation amplitude through the monitoring unit. When the battery temperature floating coefficient is greater than the battery temperature floating coefficient, the alarm unit issues an alarm prompt. When the battery positive electrode structure change is greater than the change threshold, the alarm unit issues an alarm prompt. When the ambient temperature fluctuation amplitude is greater than the fluctuation threshold, the alarm unit issues an alarm prompt. Then, the battery temperature floating coefficient, the battery positive electrode structure change and the ambient temperature fluctuation amplitude are comprehensively analyzed to establish an evaluation coefficient, thereby improving data processing efficiency. The need for re-testing is determined based on the comparison result between the evaluation coefficient and the evaluation threshold, thereby effectively ensuring the accuracy of the test.

[0067] Embodiment 3: A battery formation test method described in this embodiment comprises the following steps:

[0068] The battery is charged and discharged through the charge and discharge power supply, and the current and voltage in the process of charge and discharge are controlled. During the test, the relevant parameters that affect the test results are monitored, and thresholds are set for the relevant parameters. When a parameter exceeds the threshold, an alarm is issued, and the current, voltage and other data of the battery in the process of charge and discharge are collected. The operation of the entire test system is controlled through the control end, and the operation of the charge and discharge power supply is controlled according to the data collected by the data acquisition module to realize functions such as charge and discharge cycles. After the test, an evaluation mechanism is established through relevant parameters, and it is determined whether the test needs to be carried out again based on the evaluation mechanism.

[0069] After comprehensive analysis of the battery temperature fluctuation coefficient, the change in the battery positive electrode structure, and the ambient temperature fluctuation amplitude, the evaluation coefficient is established through the formula, and the expression is:

[0070]

[0071] In the formula, pg x is the evaluation coefficient, C is the error correction coefficient, and C is 1.665, fd c is the battery temperature fluctuation coefficient, bh c is the change in the structure of the battery positive electrode, bd h is the ambient temperature fluctuation amplitude, α and β are the proportional coefficients of battery parameters and environmental parameters respectively, and α>β>0.

[0072] Battery temperature fluctuation coefficient fd c The calculation expression is: Where W(t) is the real-time temperature inside the battery, [t x , t y ] is the battery thermal runaway warning period, [t w , t g ] is the period of battery heat dissipation warning, and the period of battery thermal runaway warning is the period of abnormal battery internal temperature acquisition, that is, the system obtains abnormal battery internal temperature data. When the battery temperature is thermal runaway and heat dissipation warning occurs, it will affect the accuracy of the system's internal temperature data obtained by the battery, and cause the battery temperature to rise and affect the test data. Therefore, the battery temperature floating coefficient is inversely proportional to the evaluation coefficient.

[0073] Battery positive electrode structure change bh c The calculation expression is: bh c=-yF((E^o(LiCoO2)-E^o(LiyCoO2)) / z), where y represents the amount of lithium ion insertion, F represents the Faraday constant, z represents the charge number of the inserted ion, E^o(LiCoO2) and E^o(LiyCoO2) represent the standard potentials of LiCoO2 and LiyCoO2 respectively. When the positive electrode material structure changes too much, it may lead to a decrease in battery capacity, thereby affecting the battery performance and test data. Therefore, the battery positive electrode structure change bh c It is inversely proportional to the evaluation coefficient.

[0074] Ambient temperature fluctuation amplitude bd h The calculation expression is: The test environment temperature range of the battery formation test system is marked as wd min ~wd max The ambient temperature is collected in real time through the temperature sensor set on the test bench, marked as wd h , when wd h >wd max When the ambient temperature fluctuation amplitude bd h =|wd h -wd max |, when wd h <wd min When the ambient temperature fluctuation amplitude bd h =|wb h -wb min |, since too high or too low ambient temperature will affect the test results of the battery formation test system, the ambient temperature fluctuation amplitude is inversely proportional to the evaluation coefficient.

[0075] In obtaining the evaluation coefficient pg x After that, the evaluation coefficient pg x With the evaluation threshold pg z The comparison results are as follows:

[0076] If the evaluation coefficient pg x <Evaluation threshold pg z During the test, the test was affected by a combination of factors, which resulted in inaccurate test data. The test needs to be repeated. After the subsequent test, it needs to be evaluated again until the evaluation coefficient pg x ≥ evaluation threshold pg z The test is then stopped and the test data is taken as the final result. If the evaluation coefficient pg of five consecutive tests is x Both are less than the evaluation threshold pg z , the judgment unit sends out a warning signal. After receiving the warning signal, the management personnel need to adjust the test environment and test equipment.

[0077] If the evaluation coefficient pgx ≥ evaluation threshold pg z , judge that the test meets the standards and output the test data.

[0078] The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0079] The above embodiments can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center containing one or more available media sets. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state hard disk.

[0080] It should be understood that the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship, but it may also indicate an "and / or" relationship. Please refer to the context for specific understanding.

[0081] In this application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0082] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0083] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0084] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0085] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0086] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0087] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0088] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks or optical disks.

[0089] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A battery formation test system, characterized in that: Including power module, monitoring module, data acquisition module, control module and evaluation module; Power module: provides charging and discharging power for the battery, and controls the current and voltage during the charging and discharging process; Monitoring module: monitors the relevant parameters that affect the test results and sets thresholds for the relevant parameters. When a parameter exceeds the threshold, an alarm is issued; Data acquisition module: collects the current and voltage data of the battery during the charging and discharging process; Control module: controls the operation of the test system, and controls the operation of the charging and discharging power supply according to the data collected by the data acquisition module. After the test is completed, the test termination information is generated; Evaluation module: After receiving the test termination information, an evaluation mechanism is established through relevant parameters, and it is determined whether the test needs to be conducted again based on the evaluation mechanism; The monitoring module includes a monitoring unit, a comparison unit and an alarm unit. The monitoring unit monitors relevant parameters that affect the test results. After the comparison unit sets a corresponding threshold for the relevant parameter, the relevant parameter is compared with the threshold. The alarm unit determines whether to issue an alarm based on the comparison result between the relevant parameter and the threshold. The monitoring unit monitors relevant parameters that affect the test results, the relevant parameters including battery parameters and environmental parameters, the battery parameters including battery temperature fluctuation coefficient and battery positive electrode structure change, and the environmental parameters including ambient temperature fluctuation amplitude; The evaluation module includes a calculation unit and a judgment unit. The calculation unit comprehensively analyzes the battery temperature fluctuation coefficient, the change in the battery positive electrode structure, and the ambient temperature fluctuation amplitude, and establishes the evaluation coefficient through a formula. The expression is: , where is the evaluation coefficient, is the error correction factor, and The value is 1.

665. is the battery temperature fluctuation coefficient, is the change in the positive electrode structure of the battery, is the ambient temperature fluctuation amplitude, are the proportional coefficients of battery parameters and environmental parameters respectively, and ; The battery temperature fluctuation coefficient The calculation expression is: :In the formula, is the real-time temperature inside the battery, This is the period of battery thermal runaway warning. During the battery heat dissipation warning period, the battery temperature fluctuation coefficient is inversely proportional to the evaluation coefficient.

2. A battery formation test system according to claim 1, characterized in that: The comparison unit sets a floating threshold, a change threshold and a fluctuation threshold for the battery temperature floating coefficient, the battery positive electrode structure change and the ambient temperature fluctuation amplitude, and compares the battery temperature floating coefficient, the battery positive electrode structure change and the ambient temperature fluctuation amplitude with the floating threshold, the change threshold and the fluctuation threshold, respectively.

3. A battery formation test system according to claim 2, characterized in that: The alarm unit issues an alarm when the battery temperature floating coefficient is greater than the battery temperature floating coefficient, when the change in the battery positive electrode structure is greater than the change threshold, and when the ambient temperature fluctuation amplitude is greater than the fluctuation threshold.

4. A battery formation test system according to claim 3, characterized in that: The change in the positive electrode structure of the battery The calculation expression is: , where represents the amount of lithium ion insertion, is the Faraday constant, represents the charge of the inserted ion, Respectively and The standard potential of the battery positive electrode structure changes It is inversely proportional to the evaluation coefficient.

5. A battery formation test system according to claim 4, characterized in that: The ambient temperature fluctuation amplitude The calculation expression is: The test environment temperature range of the battery formation test system is marked as , the ambient temperature is collected in real time through the temperature sensor set on the test bench, marked as ,when When the ambient temperature fluctuation amplitude ,when When the ambient temperature fluctuation amplitude , the fluctuation amplitude of ambient temperature is inversely proportional to the evaluation coefficient.

6. A battery formation test system according to claim 5, characterized in that: The judgment unit is used to set the evaluation threshold , in obtaining the evaluation coefficient After that, the evaluation coefficient With evaluation threshold Make a comparison; If the evaluation coefficient Evaluation Threshold During the test, the test was affected by a combination of factors, which resulted in inaccurate test data. The test needs to be repeated. After the subsequent test, it needs to be evaluated again until the evaluation coefficient is Evaluation Threshold The test is then stopped and the test data is taken as the final result. If the evaluation coefficient of five consecutive tests is Both are less than the evaluation threshold , then the judgment unit sends out a warning signal, and after receiving the warning signal, the management personnel need to adjust the test environment and test equipment; If the evaluation coefficient Evaluation Threshold , judge that the test meets the standards and output the test data.

Images