Rapid test method, equipment, medium and program product for soft-pack buckle electrical expansion performance

Abstract

The present application provides a method, equipment, medium and program product for rapid testing of the expansion performance of a soft-pack buckle, and relates to the technical field of battery performance testing. The displacement change during the battery expansion process is measured in real time by a displacement sensor, and a movable pin is used to transmit the expansion displacement of the battery. A pressure plate fixes the battery and stabilizes the movable pin. First, determine whether the battery is placed correctly, and then start the test under remote control of the display end, and control the displacement sensor to measure the displacement change of the movable pin as the data of the battery expansion displacement. After binding the displacement data to the test battery, the battery expansion performance indicators such as expansion amount, expansion rate, expansion recovery, etc. can be evaluated by analyzing the displacement change curve over time. This test equipment measures the battery expansion process in real time, and the data is accurate and reliable, avoiding manual misoperation. It can quickly and efficiently evaluate the battery expansion performance, and provide support for battery research and development and application.

Description

Technical Field

[0001] The present application relates to the technical field of battery performance testing, and in particular to a method, device, medium and program product for quickly testing the expansion performance of a soft-pack buckle. Background Art

[0002] With the widespread use of batteries, testing their safety and expansion performance has become an important task for battery manufacturers. In order to quickly evaluate the expansion performance of different battery products, a fast and accurate testing method is needed.

[0003] The traditional method of measuring battery expansion is often to measure steel-shell or fixture-type batteries. The measurement method is to place the battery in a fixed measuring device, and then use a mechanical probe or sensor to detect the displacement change of the battery shell or fixture while charging and discharging the battery, so as to calculate the expansion of the battery.

[0004] However, the rigidity of the steel shell battery will restrict the natural expansion of the battery to a certain extent, and cannot reflect the actual expansion of the battery. The sealing and fit between the fixture battery and the measuring device are not good enough, which may lead to electrolyte leakage or battery position change during the battery charging and discharging process, thereby reducing the accuracy of the data measured for the expansion amount. Summary of the invention

[0005] The present application provides a method, device, medium and program product for quickly testing the expansion performance of a soft-pack button battery, which are used to accurately evaluate the expansion performance of a soft-pack button battery.

[0006] In the first aspect, the present application provides a method for quickly testing the expansion performance of a soft-pack buckle battery, which is applied to a test device, wherein a test table for placing a battery to be tested is provided at a set position of the test device, and a displacement sensor is provided at the top of the set position, and the displacement sensor is used to measure the expansion displacement of the battery to be tested. After detecting that a user turns on the device switch, it is determined whether the distance between the test table and the displacement sensor is less than a preset distance threshold; if it is less than the preset distance threshold, it is determined that the user has placed the battery to be tested on the test table; after receiving a test start instruction sent from a display terminal, the displacement sensor is controlled to measure the displacement change data of a movable pin on the upper side of the battery to be tested, the movable pin is set at the center position of a pressure plate, and the axial position of the movable pin matches the axial position of the displacement sensor, and the pressure plate is used to press the battery to be tested and stabilize the movable pin; after binding the displacement change data with the battery to be tested, the expansion performance of the battery to be tested is evaluated according to the displacement change data.

[0007] By adopting the above technical solution, the battery placement status can be quickly confirmed to avoid erroneous testing, and the expansion of the soft pack can be measured. Under the condition of good sealing, the test results can more accurately reflect the actual expansion performance of the battery. Because good sealing can reduce the interference of external factors on the test environment, such as preventing the influence of air flow on battery temperature and humidity, it ensures that the expansion displacement data measured by the displacement sensor is only caused by the expansion of the battery itself, which improves the reliability and accuracy of the test data.

[0008] In combination with some embodiments of the first aspect, in some embodiments, after receiving the test start instruction sent by the display terminal, after the step of controlling the displacement sensor to measure the displacement change data of the movable pin on the upper side of the battery to be tested, it also includes: monitoring the pressure value applied by the pressure plate to the battery to be tested in real time by means of a pressure sensor arranged inside the pressure plate; determining a corresponding correction coefficient in an influence data comparison table according to the pressure value, and the influence data comparison table is established in advance according to the influence of the pressure plate on the battery expansion displacement under different pressures; multiplying the measured displacement change data by the correction coefficient to eliminate the influence of the pressure applied by the pressure plate on the measurement result.

[0009] By adopting the above technical solution, the influence of the pressure of the pressure plate on the measurement results can be effectively eliminated, so that the displacement change data finally obtained can more purely reflect the expansion of the battery itself, thereby improving the accuracy of the evaluation of the battery expansion performance.

[0010] In combination with some embodiments of the first aspect, in some embodiments, after receiving the test start instruction sent by the display terminal, after the step of controlling the displacement sensor to measure the displacement change data of the movable pin on the upper side of the battery to be tested, it also includes: starting a timer, the timer is used to record the total test time; according to the set charging curve scheme, controlling the charging end to input different currents to charge the battery to be tested at preset time intervals; continuously measuring and recording the displacement change data of the movable pin through the displacement sensor, and determining the change curve of the battery expansion over time under different currents based on the displacement change data.

[0011] By adopting the above technical solutions, the timer ensures the accurate recording of the test time, the charging curve solution standardizes the charging process, and the displacement sensor measurement can capture the battery expansion changes in real time. The three work together to obtain the battery expansion curve over time under different currents, fully understand the battery expansion characteristics during the charging process, and provide richer data support for evaluating battery performance.

[0012] In combination with some embodiments of the first aspect, in some embodiments, after the step of controlling the charging end to input different currents to the battery to be tested for charging at preset time intervals according to a set charging curve scheme, the method further includes: when the test duration recorded by the timer reaches a preset total duration, controlling the charging end to stop charging; controlling the displacement sensor to continue measuring the displacement of the movable pin to obtain displacement recovery data of the battery to be tested after charging is stopped; after obtaining the displacement change data of the movable pin during the entire test period, calculating the maximum displacement value, average displacement rate and displacement recovery rate in combination with the displacement recovery data; and determining the expansion performance of the battery to be tested based on the maximum displacement value, the average displacement rate and the displacement recovery rate.

[0013] By adopting the above technical solution, the relevant indicators are calculated in combination with the displacement change data during the entire test period. The timer controls the charging time to ensure the standardization of the test, and the continuous measurement of the displacement sensor provides complete data. The maximum displacement value, average displacement rate and displacement recovery rate calculated from these data can comprehensively evaluate the expansion performance of the battery during and after charging, and more accurately judge the battery quality.

[0014] In combination with some embodiments of the first aspect, in some embodiments, before the step of controlling the charging end to input different currents to the battery to be tested for charging at preset time intervals according to the set charging curve scheme, it also includes: receiving product parameters of the battery to be tested sent by the display end; matching the corresponding recommended test scheme in a preset battery product parameter database according to the product parameters, and the recommended test scheme at least includes the charging curve scheme and the preset time interval.

[0015] By adopting the above technical solutions, product parameters provide the basis for matching, and the database ensures that a suitable test solution can be found. In this way, targeted test methods can be adopted according to the characteristics of different batteries, making the test process more scientific and reasonable, and improving the accuracy and reliability of battery expansion performance evaluation.

[0016] In combination with some embodiments of the first aspect, in some embodiments, after the step of receiving the test start instruction sent by the display terminal, it also includes: detecting the temperature of the battery to be tested in real time through a temperature sensor; determining whether the temperature of the battery to be tested does not match the preset temperature threshold; if it does not match the preset temperature threshold, controlling the temperature control device to adjust the temperature of the battery to be tested until the temperature is adjusted to within the preset temperature threshold, and the temperature control device is arranged in the detection cabin.

[0017] By adopting the above technical solution, it is ensured to a certain extent that the battery is tested in a stable temperature environment, avoiding the influence of temperature on the battery expansion performance, and improving the accuracy and comparability of the test results.

[0018] In combination with some embodiments of the first aspect, in some embodiments, after detecting that the user turns on the device switch, after the step of detecting whether the distance between the testing platform and the displacement sensor is less than a preset distance threshold, it also includes: if it is not less than the preset distance threshold, a prompt message is issued, and the prompt message is used to inform the user that the battery to be tested is not correctly placed on the testing platform.

[0019] By adopting the above technical solution, users can find out the battery placement error in time and re-place the battery correctly, thus avoiding test failure or wrong results caused by improper battery placement and improving the success rate and accuracy of the test.

[0020] In a second aspect, the present application provides a testing device, comprising: one or more processors and a memory; the memory is coupled to the one or more processors, the memory is used to store computer program code, the computer program code includes computer instructions, and the one or more processors call the computer instructions to enable the testing device to perform the method described in the first aspect and any possible implementation of the first aspect.

[0021] In a third aspect, the present application provides a computer-readable storage medium comprising instructions, which, when executed on a test device, causes the test device to execute the method described in the first aspect and any possible implementation of the first aspect.

[0022] In a fourth aspect, the present application provides a computer program product. When the computer program product is run on a test device, the test device executes the method described in the first aspect and any possible implementation manner of the first aspect.

[0023] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0024] 1. Due to the use of a pressure plate to fix the battery, a movable pin to transmit displacement, and a displacement sensor to measure, the expansion measurement can be performed when the battery is well sealed, reducing external environmental interference, so that the measurement results can more accurately reflect the actual expansion performance of the battery.

[0025] 2. Since a pressure sensor is set inside the pressure plate to monitor the pressure, and the displacement change data is corrected in combination with the influencing data comparison table, the technical problem that it is difficult to eliminate the influence of the pressure plate pressure on the battery expansion measurement results in the prior art is effectively solved, thereby achieving the technical effect of improving the accuracy of battery expansion performance evaluation.

[0026] 3. Since a temperature sensor is used to detect the battery temperature in real time and a temperature control device is used to adjust the temperature, the technical problem of the prior art that it is difficult to test the battery expansion performance under a stable temperature environment is effectively solved, thereby achieving the technical effect of improving the accuracy and comparability of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a flow chart of a method for quickly testing the electrical expansion performance of a soft-pack buckle in an embodiment of the present application;

[0028] Figure 2 This is another flow chart of the method for quickly testing the electrical expansion performance of a soft-pack buckle in an embodiment of the present application;

[0029] Figure 3 It is a schematic diagram of a physical device structure of the test equipment in the embodiment of the present application. DETAILED DESCRIPTION

[0030] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to be used as limitations to the present application. As used in the specification and appended claims of the present application, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include plural expressions, unless there is a clear indication to the contrary in the context. It should also be understood that the term "and / or" used in the present application refers to and includes any or all possible combinations of one or more listed items.

[0031] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0032] The battery to be tested in this application is a soft-pack button battery, which uses an aluminum-plastic film with good flexibility and mechanical strength to wrap the battery to achieve reliable fixation and electrical connection of the battery. The soft-pack shape fits the battery surface completely without gaps. The sealing structure can effectively prevent electrolyte leakage and avoid short circuits during battery testing. The size and shape of the soft-pack button battery can be customized to fully fit batteries of different sizes and shapes. The inner surface has an electrode layer that is in direct contact with the battery pole piece to achieve electrical connection. For ease of understanding, the structure of this application is first described below.

[0033] The test equipment is a device specially used for testing the expansion performance of soft-pack button batteries. Its core structure revolves around the ability to accurately measure the expansion displacement of batteries. The equipment is mainly composed of a test bench, a displacement sensor, and related auxiliary structures and components, which work together to achieve rapid and accurate testing of the expansion performance of soft-pack button batteries. The test bench is located at the set position of the test equipment and is a platform for placing the battery to be tested. It provides a stable placement position for the battery to ensure that the battery will not move unnecessarily during the test, thereby affecting the accuracy of the measurement results. Under the test bench, a battery information reading module may be set up, which can obtain relevant information about the battery in a variety of ways. For example, it can communicate with the identification chip on the battery (if present) and use wireless communication technology such as Bluetooth or near-field communication (NFC) to read basic information such as the battery model, capacity, and production batch. Alternatively, it can also infer relevant information about the battery by detecting the connection between the battery electrode and the test bench electrode interface and analyzing the electrical characteristics of the battery. The displacement sensor is set at the top of the set position of the test bench, and its main function is to measure the expansion displacement of the battery to be tested. During battery charging or other testing conditions, the battery may expand, which will push up the pressure plate and the movable pin to move upward. The displacement sensor can capture the displacement changes of the movable pin in real time to determine the displacement changes caused by the battery expansion, providing key data for the subsequent evaluation of the battery's expansion performance.

[0034] It also includes a pressure plate, which can be placed above the battery to be tested during the test, and a movable pin is set at its center. The main function of the pressure plate is to press the battery to be tested to keep it stable during the test and prevent the battery from shifting during the expansion process. It also stabilizes the movable pin to ensure that the movable pin can accurately transmit the expansion displacement of the battery to the displacement sensor. A pressure sensor can be set inside the pressure plate. The pressure sensor is used to monitor the pressure value applied by the pressure plate to the battery in real time. This is very important for the subsequent accurate evaluation of the battery expansion performance, because the pressure of the pressure plate may affect the expansion displacement of the battery, and the measurement results can be corrected by monitoring the pressure value. In order to ensure the stability of the test environment, the test equipment may also include a sealed test cabin. The test cabin can prevent the influence of factors such as external air flow, temperature changes and humidity changes on the test results. In the test cabin, a temperature control device and a humidity adjustment device may be set to ensure that the battery is tested in a stable environment.

[0035] The test equipment may also include some electrical connection structures for connecting the battery to the charging terminal, as well as various sensors and control systems. These electrical connection structures need to ensure good conductivity and stability to avoid circuit failure or signal interference during the test.

[0036] The following is a description of the process of the method provided by this implementation. Figure 1, which is a flow chart of a method for quickly testing the electrical expansion performance of a soft package in an embodiment of the present application.

[0037] S101, after detecting that the user turns on the device switch, determining whether the distance between the detection platform and the displacement sensor is less than a preset distance threshold;

[0038] After receiving the signal from the user turning on the device switch, the test equipment starts the relevant detection program. After receiving the signal from the device switch, the displacement sensor in the test equipment will continue to send detection signals. This detection signal will propagate in the space between the test platform and the displacement sensor, and determine the distance between the two based on information such as the strength and time of the reflected signal. The distance between the two is used to determine whether the user has placed the battery to be tested on the test platform. If it has been placed on the test platform, the distance between the displacement sensor and the test platform will be less than the preset distance threshold. The preset distance threshold is determined during the equipment design and debugging stage. It is set after considering multiple factors such as the size and shape of the battery to be tested and the measurement accuracy of the displacement sensor. If it is greater than or equal to the preset distance threshold, the test equipment will consider that the battery is not placed correctly, and may trigger a corresponding prompt mechanism (such as sounding an alarm or displaying a prompt message on the display) to inform the user that the battery needs to be re-placed.

[0039] S102, if the distance is less than the preset distance threshold, it is determined that the user has placed the battery to be tested on the testing table;

[0040] When this distance is less than a preset threshold, the control system inside the device will recognize it as the battery being placed and can begin testing its expansion.

[0041] S103, after receiving the start test instruction sent by the display terminal, controlling the displacement sensor to measure the displacement change data of the movable pin on the upper side of the battery to be tested, the movable pin is set at the center position of the pressure plate, the axial position of the movable pin matches the axial position of the displacement sensor, and the pressure plate is used to press the battery to be tested and stabilize the movable pin;

[0042] When the test equipment receives the start test command from the display end of the communication connection, the displacement sensor starts working. Displacement sensors usually measure displacement based on optical, electrical or mechanical principles. For example, a laser displacement sensor is used, which emits a laser beam to the surface of the movable pin. When the movable pin moves due to battery expansion, the position of the reflected laser beam will change. The displacement sensor determines the displacement of the movable pin by detecting the change in the position of this laser beam. The main function of the pressure plate is to press the battery to prevent the battery from moving during the test, thereby affecting the measurement results. At the same time, it also stabilizes the movable pin to ensure that the movable pin can accurately transmit the expansion displacement of the battery to the displacement sensor. The axial position of the movable pin matches the axial position of the displacement sensor, which means that their center lines in the vertical direction coincide. This means that when the movable pin moves in the vertical direction due to battery expansion, it can accurately transmit the displacement to the displacement sensor. The movable pin needs to have sufficient strength and rigidity to withstand the force of battery expansion, while being able to move flexibly. The surface of the movable pin can be finely processed to ensure good contact with the pressure plate and the displacement sensor to reduce friction and energy loss.

[0043] S104: After binding the displacement change data with the battery to be tested, evaluating the expansion performance of the battery to be tested according to the displacement change data.

[0044] When the displacement sensor measures the displacement change data of the movable pin, the test equipment will bind these data to the battery to be tested. In the internal database of the test equipment, a unique identifier will be assigned to each battery to be tested, usually a digital code or a string. This identifier will be stored in the database together with relevant information of the battery, such as battery model, batch, etc. Then, the displacement change data obtained each time will be associated with this identifier and stored in the corresponding record of the database. In this way, in the subsequent analysis and evaluation process, the corresponding displacement change data can be easily found according to the battery identifier. More specifically, a battery information reading module is set at the bottom or side of the test bench, which can include a barcode scanner or an RFID reader. Before the test, the technician can use the barcode scanner to scan the barcode on the battery shell to obtain the product information of the battery, such as model, serial number, etc., or embed an RFID tag inside or on the shell of the battery, and automatically read the battery information in the tag through the RFID reader. The battery information reading module is connected to the test control computer through a standardized interface, and the scanned or read battery information can be sent to the computer in real time. The computer software will establish a battery information table containing a variety of information data of the corresponding battery. During the battery test, the software can automatically bind the collected displacement data to the battery information table according to the position of the battery on the test bench. The final test report will synchronously include the battery identification information and test displacement result data. This solution realizes the automatic acquisition and entry of battery information, avoids manual input errors, and improves test efficiency and data traceability.

[0045] For displacement change data, if it is recorded in the form of a time series, for example, the displacement value is recorded at a certain time interval (such as 1 second), then the battery expansion can be calculated by summing these displacement values. Assuming that during the test, the displacement values ​​of n time points are recorded as d1, d2, ..., dn, respectively, then the battery expansion D can be calculated by the formula If the displacement change data is in the form of a continuous function, for example, d(t) represents the function of displacement change over time t, then the integral , where t1 and t2 are the start and end times of the test.

[0046] The expansion rate is an important indicator to describe the expansion speed of the battery. The expansion rate can be obtained by calculating the displacement change at adjacent time points. Assuming that the displacement value at time t1 is d1 and the displacement value at time t2 is d2, then the expansion rate at the time interval The expansion rate can be expressed by the formula To calculate. If the displacement change data is in the form of a continuous function, the expansion rate can be obtained by taking the derivative of the displacement function, that is, v = d'(t), where d'(t) is the derivative of the displacement function d(t). Finally, the displacement change data and the corresponding expansion performance data are sent to the display end for display.

[0047] In the embodiment of the present application, expansion measurement can be performed when the battery has good sealing performance, which effectively solves the problem in traditional testing methods that measurement accuracy is affected by poor sealing between the battery and the measuring device, thereby achieving the technical effect of improving the accuracy and reliability of test data and accurately evaluating the expansion performance of the soft-pack buckle.

[0048] In some embodiments, since the pressure plate exerts pressure on the battery, this will affect the battery expansion performance test. Specifically, the pressure of the pressure plate may change the normal expansion process and amount of the battery, so that the measurement results cannot accurately reflect the true expansion performance of the battery. In this case, a high-precision pressure sensor is installed inside the pressure plate to detect and feedback the pressure value applied by the pressure plate on the battery in real time. Through a large number of experiments in advance, the effect of the pressure plate on the expansion displacement of the battery under different pressures is tested, and a corresponding table of pressure and influencing factors is established as an influencing data comparison table. In the comparison table, the greater the pressure, the greater the influence coefficient of the pressure plate to limit the expansion of the battery.

[0049] During the test, the pressure sensor continuously monitors the pressure value, and the processor searches the reference table for the corresponding influence coefficient k based on the pressure value. The influence of pressure can be eliminated by multiplying the original displacement data collected by the displacement sensor by (1-k). For example, if the test is performed at a pressure of 0.1N, the influence coefficient of the pressure k=0.05 is known from the reference table. When the original displacement is 10mm, the correct displacement should be 10 / (1-0.05)=10.53mm. By introducing pressure correction, accurate displacement data that eliminates the influence of the pressure plate can be obtained, thereby more accurately evaluating the true expansion performance of the battery. This solution can effectively improve the accuracy of the test results and provide reliable support for battery design optimization.

[0050] After combining the above embodiments, the method provided by this embodiment is further described in more detail below. Figure 2 , is another flow chart of the method for quickly testing the electrical expansion performance of a soft package in an embodiment of the present application.

[0051] S201, start a timer, the timer is used to record the total test time;

[0052] The timer is connected to the displacement sensor in communication. The timer has a built-in accurate clock chip that can accurately count the test time. When the test equipment sends a measurement instruction to the displacement sensor, it also sends a start timing signal to the timer. After receiving the signal, the timer immediately reads the initial time value of the clock chip as the start time of the test, and queries the clock chip cyclically to update the current time. The difference between the current time and the start time can be used to calculate the duration of the test in real time. In order to improve the timing accuracy, the timer can adopt a redundant design, with two built-in clock chips for synchronous timing. The processor will compare the two timing results. If there is an inconsistency beyond the error range, it is judged as a clock chip failure, and an alarm prompts the user to replace the timer module. In addition, the timer also has a timed reporting function, which can actively upload the current timing results to the processor of the test equipment at a certain time interval, such as 10 seconds, to avoid the problem of loss of timing data caused by long-term non-reading.

[0053] S202, receiving product parameters of the battery to be tested sent by the display terminal;

[0054] The communication interface of the test equipment continuously monitors the information from the display end. When receiving the instruction containing the parameters of the battery product to be tested from the display end, it will immediately parse the instruction and extract the specific parameter information of the battery, including key parameters such as battery brand, model, capacity, and voltage. To avoid parameter errors, the processor will immediately send the parameter information back to the display end for confirmation after obtaining it, and the operator will check whether the parameters are correct. After receiving the confirmation request, the display end will display the extracted parameter information and provide a confirmation button for the operator to click to confirm. After receiving the confirmation instruction from the operator, the processor will accept the transmitted battery product parameters as formal parameters for subsequent matching and test plan determination.

[0055] S203, matching a corresponding recommended test scheme in a preset battery product parameter database according to the product parameters, where the recommended test scheme at least includes a charging curve scheme and a preset time interval;

[0056] The battery product parameter database adopts the cloud database architecture, which includes two parts: the battery parameter table and the recommended solution table. The battery parameter table contains the specific parameters of various types of batteries, such as brand, model, voltage, capacity, size and other information. A unique ID is set for each battery model and associated with the recommended solution table. The recommended solution table contains the recommended test solutions for different battery models. Each solution is associated with the battery model ID, mainly including: Charging curve solution: preset charging voltage and current curve data used by the battery at different stages of the test process. Time interval solution: the time interval for sampling and measuring battery expansion data at each stage of the charging curve. Total test duration: the total duration of the entire test cycle. After receiving the product parameters of the battery, the system will search for the ID of the battery model in the battery parameter table. According to the battery model ID found, the associated recommended test solution is searched in the recommended solution table. If a completely matching battery parameter is found, the recommended solution is directly read for use in this test. If a complete match is not found, a suitable recommended solution will be selected from batteries with similar parameters, and the user is allowed to adjust and generate a new solution. The new test solution will also be saved to continuously improve the database for subsequent direct calls. In this way, through parameter association and dual-table structure, the most suitable test plan can be matched according to the battery brand and model quickly and efficiently, realizing personalized and intelligent testing.

[0057] S204, according to the set charging curve scheme, controlling the charging terminal to input different currents to the battery to be tested at preset time intervals for charging;

[0058] The charging end hardware can include modules such as programmable power supply, controller, current detector, etc. Users can electrically connect the charging end to the battery to be tested before testing. The programmable power supply can quickly adjust the voltage and current while ensuring stable output. The controller has a built-in charging curve solution interpreter that can parse the curve data and split it into multiple stages. Each stage contains a target current value and duration. The controller uses an internal timer to time each charging stage and sends current adjustment instructions to the programmable power supply according to the preset time interval. After receiving the instruction, the programmable power supply will immediately adjust the output current to the target value and feedback the real-time current value. The controller collects the real-time current through the current detector and performs closed-loop control with the target value to ensure that the output accurately meets the curve solution.

[0059] When the timing of one stage ends, the controller starts the next stage of charging, and the cycle continues until all curves are completed. If an abnormality is detected, such as overcurrent or overvoltage, the controller will quickly cut off the power supply to ensure battery safety. The controller will also synchronously transmit real-time charging data to the central processor of the test equipment for recording and analysis. After the preset total charging time is over, the controller stops charging and completes a test cycle. Through the analysis and execution of the curve scheme and closed-loop control, the charging end can be accurately controlled to charge the battery according to the set scheme, realizing the automation of the test.

[0060] S205, when the test duration recorded by the timer reaches the preset total duration, controlling the charging end to stop charging;

[0061] The timer uses a high-precision clock chip to count the elapsed time of the test in real time. The timer is connected to the processor of the test equipment and transmits the real-time timing value to the processor synchronously. When the processor detects that the timing value reaches the preset total test time, it sends a stop charging instruction to the charging end controller, and the controller immediately cuts off the power output, stops charging the battery, and feedbacks the charging stop status.

[0062] S206, controlling the displacement sensor to continue measuring the displacement of the movable pin to obtain displacement recovery data of the battery to be tested after charging is stopped;

[0063] After charging stops, the processor continues to control the displacement sensor to monitor the displacement of the movable pin. As the chemical reaction inside the battery subsides, the displacement value of the movable pin will gradually stabilize. The displacement monitoring curve after charging stops is used as displacement recovery data, which can show the natural attenuation of battery expansion. The processor records the displacement recovery curve for a period of time and then ends the measurement, such as when the curve has been stable for 30 minutes. The displacement recovery curve is compared with the displacement curve of the charging process to calculate the displacement recovery rate, which can evaluate the ability of the battery to expand and fall back after the excitation stops.

[0064] S207, after obtaining the displacement change data of the movable pin during the entire test period, calculate the maximum displacement value, the average displacement rate and the displacement recovery rate in combination with the displacement recovery data;

[0065] The processor of the test equipment will create a displacement data file for the battery, which includes a timestamp and the corresponding displacement value. After the test is completed, the processor analyzes and calculates the displacement data file: scan the displacement data value, find the data point corresponding to the maximum displacement, and its value is the maximum displacement value. Statistically calculate the displacement change between adjacent points of the displacement data, and then normalize it to obtain the average displacement change rate. Identify the charging stop point, take the displacement data for a period of time after this point as the displacement recovery data, analyze the displacement recovery curve, calculate the percentage of battery displacement recovery, and obtain the displacement recovery rate, where the displacement recovery rate = displacement recovery amount / maximum displacement value.

[0066] The calculated maximum displacement value, average displacement rate and displacement recovery rate are used as important expansion performance indicators of the battery. The processor will automatically generate a test report, including the above indicators and displacement curves and other results. The calculation process of this solution is fully automated to avoid manual errors and ensure accurate and reliable results.

[0067] S208. Determine the expansion performance of the battery to be tested according to the maximum displacement value, the average displacement rate, and the displacement recovery rate.

[0068] The maximum displacement value, average displacement rate and displacement recovery rate obtained during the test are input into the expansion performance evaluation model. The evaluation model is a machine learning-based model, which is trained based on a large amount of existing battery test data. Multiple discrimination rules are set in the model to determine the battery expansion performance level based on the numerical range of the input indicators. According to the discrimination rules, a comprehensive level of battery expansion performance can be determined, such as good, general or needs to be optimized. The evaluation model can also give a weight to each discrimination rule and adjust it according to different performance requirements. The battery expansion performance results output by the model will be automatically generated in the test report. Through the intelligent analysis and judgment of the machine learning model, combined with multiple displacement indicators, efficient and accurate battery expansion performance evaluation can be achieved.

[0069] In the embodiments of the present application, data such as the expansion characteristics of the battery during the charging process and the recovery characteristics after charging can be accurately obtained, which effectively solves the problem that the traditional battery expansion performance testing method cannot accurately obtain data at different stages and cannot comprehensively evaluate the battery performance, thereby achieving the technical effect of accurately and comprehensively evaluating the expansion performance of soft-pack button batteries.

[0070] In some embodiments, in practical applications, the temperature change in the test environment may be uncontrollable. If the temperature change is not controlled, it will interfere with the test results. Clearly writing out the steps for controlling the temperature can show the improvement of the test accuracy of the present invention. Even though temperature change is an influencing factor of battery expansion, the sensitivity of different battery products to temperature change is not exactly the same. Controlling the temperature can study the expansion differences of different products under the influence of temperature. Specifically, a high-precision temperature sensor is set in the test cabin to detect the battery temperature in real time. A redundant design is adopted, and multiple groups of temperature probes are set to monitor simultaneously and cross-validate the temperature data. The measurement range of the temperature sensor can cover -10°C to 60°C, with an accuracy of ±0.1°C and a resolution of 0.01°C. And it has an anti-interference design to ensure accurate and reliable measurement. Set the ideal temperature range for battery testing, such as 15°C to 35°C, and arrange it as a preset temperature threshold. The threshold is set in the controller of the test equipment.

[0071] The controller of the test equipment collects data from the temperature sensor in real time and constantly compares it with the preset threshold. If the battery temperature deviates from the threshold range, the temperature adjustment is triggered. The temperature control device includes an electric heating system and a cooling system. The electric heating system arranges electric heating plates on the surface of the battery, which can quickly and accurately heat the battery. The cooling system quickly cools the battery by thermal interaction with the low-temperature source outside the measurement cabin. The controller can accurately control the power of the electric heating plate and heat the battery at a rate of 0.5°C per minute until the battery temperature enters the preset temperature threshold range. For cooling, the temperature in the test cabin can be cooled at a set rate per minute by adjusting the flow of low-temperature coolant flowing through the measurement cabin to control the temperature within the threshold range. During the entire test process, the controller will continuously monitor the battery temperature and perform automatic closed-loop control to ensure that the battery temperature is stable within the preset threshold range.

[0072] Through precise temperature detection and fast and effective temperature control methods, the impact of battery temperature on test results can be minimized, ensuring the accuracy and reliability of the test.

[0073] The following describes the test equipment in the embodiment of the present invention from the perspective of hardware processing. Figure 3 , is a schematic diagram of a physical device structure of a test device in an embodiment of the present application.

[0074] It should be noted that Figure 3 The structure of the test device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0075] like Figure 3As shown, the test device includes a central processing unit (CPU) 301, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 302 or the program loaded from the storage part 308 to the random access memory (RAM) 303, such as executing the method described in the above embodiment. In the RAM 303, various programs and data required for system operation are also stored. The CPU 301, the ROM 302 and the RAM 303 are connected to each other through the bus 304. The input / output (I / O) interface 305 is also connected to the bus 304.

[0076] The following components are connected to the I / O interface 305: an input section 306 including an audio input device, a button switch, etc.; an output section 307 including a liquid crystal display (LCD) and an audio output device, an indicator light, etc.; a storage section 308 including a hard disk, etc.; and a communication section 309 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication section 309 performs communication processing via a network such as the Internet. A drive 310 is also connected to the I / O interface 305 as needed. A removable medium 311, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 310 as needed so that a computer program read therefrom is installed into the storage section 308 as needed.

[0077] In particular, according to an embodiment of the present invention, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through the communication part 309, and / or installed from a removable medium 311. When the computer program is executed by the central processing unit (CPU) 301, various functions defined in the present invention are performed.

[0078] It should be noted that specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in combination with an instruction execution system, apparatus, or device.

[0079] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present invention. Each box in the flowchart or block diagram may represent a module, a program segment, or a part of a code, and the above-mentioned module, program segment, or a part of a code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the box may also occur in an order different from that marked in the accompanying drawings.

[0080] Specifically, the testing device of this embodiment includes a processor and a memory. The memory stores a computer program. When the computer program is executed by the processor, the method for quickly testing the electrical expansion performance of a soft package provided in the above embodiment is implemented.

[0081] As another aspect, the present invention further provides a computer-readable storage medium, which may be included in the test device described in the above embodiment; or may exist independently without being assembled into the test device. The above storage medium carries one or more computer programs, and when the above one or more computer programs are executed by a processor of the test device, the test device implements the method for quickly testing the electrical expansion performance of a soft package provided in the above embodiment.

[0082] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0083] As used in the above embodiments, the term "when..." may be interpreted to mean "if..." or "after..." or "in response to determining..." or "in response to detecting...", depending on the context. Similarly, the phrases "upon determining..." or "if (the stated condition or event) is detected" may be interpreted to mean "if determining..." or "in response to determining..." or "upon detecting (the stated condition or event)" or "in response to detecting (the stated condition or event)", depending on the context.

[0084] Those skilled in the art can understand that to implement all or part of the processes in the above-mentioned embodiments, the processes can be completed by computer programs to instruct related hardware, and the programs can be stored in computer-readable storage media. When the programs are executed, they can include the processes of the above-mentioned method embodiments. The aforementioned storage media include: ROM or random access memory RAM, magnetic disk or optical disk and other media that can store program codes.

Claims

1. A method for quickly testing the expansion performance of a soft-pack buckle, applied to a test device, wherein a detection table for placing a battery to be tested is provided at a set position of the test device, and a displacement sensor is provided at the top of the set position, and the displacement sensor is used to measure the expansion displacement of the battery to be tested, characterized in that: After detecting that the user turns on the device switch, determining whether the distance between the detection platform and the displacement sensor is less than a preset distance threshold; If the distance is less than the preset distance threshold, it is determined that the user has placed the battery to be tested on the testing table; After receiving the start test instruction sent by the display terminal, the displacement sensor is controlled to measure the displacement change data of the movable pin on the upper side of the battery to be tested, the movable pin is set at the center position of the pressure plate, the axial position of the movable pin matches the axial position of the displacement sensor, and the pressure plate is used to press the battery to be tested and stabilize the movable pin; After binding the displacement change data with the battery to be tested, evaluating the expansion performance of the battery to be tested according to the displacement change data; After receiving the start test instruction sent by the display terminal, after the step of controlling the displacement sensor to measure the displacement change data of the movable pin on the upper side of the battery to be tested, the method further includes: The pressure value applied by the pressing plate to the battery to be tested is monitored in real time by a pressure sensor arranged inside the pressing plate; Determine a corresponding correction coefficient in an influence data comparison table according to the pressure value, wherein the influence data comparison table is established in advance according to the influence of the pressure plate on the expansion displacement of the battery under different pressures; The measured displacement change data is multiplied by the correction coefficient to eliminate the influence of the pressure applied by the pressure plate on the measurement result.

2. The method according to claim 1, characterized in that After receiving the start test instruction sent by the display terminal, after the step of controlling the displacement sensor to measure the displacement change data of the movable pin on the upper side of the battery to be tested, the method further includes: Start a timer, the timer is used to record the total test time; According to the set charging curve scheme, the charging terminal is controlled to input different currents to the battery to be tested for charging at preset time intervals; The displacement sensor continuously measures and records the displacement change data of the movable pin, and determines the change curve of battery expansion over time under different currents according to the displacement change data.

3. The method according to claim 2, characterized in that After the step of controlling the charging terminal to input different currents to the battery to be tested at preset time intervals according to the set charging curve scheme, the method further includes: When the test duration recorded by the timer reaches a preset total duration, controlling the charging end to stop charging; Controlling the displacement sensor to continue measuring the displacement of the movable pin to obtain displacement recovery data of the battery to be tested after charging is stopped; After obtaining the displacement change data of the movable pin during the entire test period, the maximum displacement value, the average displacement rate and the displacement recovery rate are calculated in combination with the displacement recovery data; The expansion performance of the battery to be tested is determined according to the maximum displacement value, the average displacement rate and the displacement recovery rate.

4. The method according to claim 2, characterized in that: Before the step of controlling the charging terminal to input different currents to the battery to be tested at preset time intervals for charging according to the set charging curve scheme, the method further includes: Receiving product parameters of the battery to be tested sent by the display terminal; A corresponding recommended test scheme is matched in a preset battery product parameter database according to the product parameters, and the recommended test scheme at least includes the charging curve scheme and the preset time interval.

5. The method according to claim 1, characterized in that After receiving the step of starting the test instruction sent by the display terminal, the method further includes: Detecting the temperature of the battery to be tested in real time by a temperature sensor; Determining whether the temperature of the battery to be tested does not match a preset temperature threshold; If it does not match the preset temperature threshold, a temperature control device is controlled to adjust the temperature of the battery to be tested until the temperature is adjusted to within the preset temperature threshold, and the temperature control device is arranged in the detection chamber.

6. The method according to claim 1, characterized in that After detecting that the user turns on the device switch, after the step of detecting whether the distance between the detection platform and the displacement sensor is less than a preset distance threshold, the method further includes: If the distance is not less than the preset distance threshold, a prompt message is issued, wherein the prompt message is used to inform the user that the battery to be tested is not correctly placed on the testing table.

7. A testing device, characterized in that: The test device comprises: one or more processors and a memory; the memory is coupled to the one or more processors, the memory is used to store computer program code, the computer program code comprises computer instructions, and the one or more processors call the computer instructions to cause the test device to execute the method as described in any one of claims 1-6.

8. A computer-readable storage medium comprising instructions, characterized in that: When the instructions are executed on a test device, the test device is caused to execute the method according to any one of claims 1 to 6.

9. A computer program product, characterized in that When the computer program product is run on a test device, the test device is caused to execute the method according to any one of claims 1 to 6.

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