Battery open-circuit voltage testing method and device and electronic equipment
By performing temperature pretreatment and tab temperature control during battery open-circuit voltage testing, combined with a compensation model, the problems of poor test accuracy and stability were solved, and more accurate battery performance evaluation was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 广东瑞浦兰钧能源有限公司
- Filing Date
- 2026-01-13
- Publication Date
- 2026-05-08
AI Technical Summary
The open-circuit voltage test of batteries suffers from poor accuracy and stability, making it difficult to improve the reliability of battery performance evaluation. Existing technologies use constant-temperature workshops to control temperature, resulting in high costs and inconsistent test results.
By pre-treating the battery in the pre-treatment area to bring it close to the preset reference temperature, and then transferring it to the constant temperature test area to control the temperature of the tab, the open circuit voltage value, internal resistance value and tab temperature value are collected simultaneously and input into the pre-calibrated compensation model for temperature compensation.
It improves the accuracy and stability of battery open-circuit voltage testing, eliminates the interference of temperature drift on test results, and enhances the reliability of battery performance evaluation.
Smart Images
Figure CN121995218A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of battery technology, and specifically relates to a method, apparatus and electronic device for testing the open circuit voltage of a battery. Background Technology
[0002] In battery manufacturing, open-circuit voltage is a key parameter characterizing the cell's state, screening self-discharge performance, and evaluating product quality. During production, cell placement and testing are typically conducted in open environments, leading to temperature fluctuations that significantly impact open-circuit voltage testing and consequently, the assessment of cell performance. Current technology often employs placing testing equipment in a temperature-controlled workshop to minimize the impact of temperature fluctuations. However, this method is costly, and even within a temperature-controlled workshop, the wide distribution of test points results in significant temperature variations between them, leading to inconsistent test results.
[0003] Therefore, it is necessary to provide a new technical solution to solve the above-mentioned technical problems. Summary of the Invention
[0004] The technical problem to be solved by this invention is the poor accuracy and stability of battery open-circuit voltage testing, which makes it difficult to improve the reliability of battery performance evaluation.
[0005] To address the aforementioned technical problems, this invention provides a method for testing the open-circuit voltage of a battery. The method includes: placing the battery in a pretreatment zone for temperature pretreatment to bring its temperature close to a preset reference temperature; transferring the pretreated battery to a constant-temperature testing zone and controlling the temperature of the battery's tabs to keep them within a preset temperature range; simultaneously acquiring the battery's open-circuit voltage, internal resistance, and tab temperature while the tab temperature is within the preset temperature range; inputting the acquired open-circuit voltage, internal resistance, and temperature values into a pre-calibrated compensation model, calculating and outputting the final open-circuit voltage value after temperature compensation by the compensation model.
[0006] Optionally, placing the battery in the pretreatment area for temperature pretreatment to bring the battery temperature closer to the preset reference temperature includes bringing the battery temperature closer to the preset reference temperature by letting it stand still or by slowly heating or cooling it.
[0007] Optionally, the preset reference temperature is 25℃±1℃.
[0008] Optionally, transferring the pretreated battery to a constant temperature test area and controlling the temperature of the battery tabs to keep the temperature of the tabs within a preset temperature range includes controlling the temperature of the battery tabs using a semiconductor temperature control element to keep the temperature of the tabs within a preset temperature range.
[0009] Optionally, the preset temperature range is 25℃±0.5℃.
[0010] Optionally, the collected open-circuit voltage, internal resistance, and temperature values are input into a pre-calibrated compensation model. The model calculates and outputs the final open-circuit voltage value after temperature compensation, including the actual open-circuit voltage values of a specific battery model measured under multiple different temperature conditions. A three-dimensional correspondence between the actual temperature, actual internal resistance, and actual open-circuit voltage deviation is established. The compensation model is generated through data fitting. The compensation model is used to calculate and output the final open-circuit voltage value after compensation based on the input open-circuit voltage, internal resistance, and temperature values.
[0011] Optionally, the battery open-circuit voltage test method further includes automatically sorting the batteries based on the final open-circuit voltage value.
[0012] According to another aspect of the present invention, the present invention also provides a battery open-circuit voltage testing device, the battery open-circuit voltage testing device comprising: a pre-processing module for placing the battery in a pre-processing area for temperature pre-processing to bring the temperature of the battery close to a preset reference temperature; a constant temperature testing module for transferring the pre-processed battery to a constant temperature testing area and controlling the temperature of the battery tabs to keep the temperature of the tabs within a preset temperature range; a data acquisition module for simultaneously acquiring the open-circuit voltage value, internal resistance value, and temperature value of the battery tabs when the temperature of the tabs is within the preset temperature range; and a calculation module for inputting the acquired open-circuit voltage value, internal resistance value, and temperature value into a pre-calibrated compensation model, calculating and outputting the final open-circuit voltage value after temperature compensation by the compensation model.
[0013] Optionally, the temperature control platform of the pretreatment module includes a heat-conducting plate or a PTC heater for heating or cooling the battery.
[0014] According to another aspect of the present invention, the present invention also provides an electronic device for testing the open-circuit voltage of a battery, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it performs the following steps: placing the battery in a pre-processing area for temperature pre-processing to bring the temperature of the battery close to a preset reference temperature; transferring the pre-processed battery to a constant-temperature testing area and controlling the temperature of the battery tabs to keep the temperature of the tabs within a preset temperature range; when the temperature of the tabs is within the preset temperature range, simultaneously acquiring the open-circuit voltage value, internal resistance value, and temperature value of the battery; inputting the acquired open-circuit voltage value, internal resistance value, and temperature value into a pre-calibrated compensation model, calculating and outputting the final open-circuit voltage value after temperature compensation by the compensation model.
[0015] Beneficial effects: This invention provides a method for testing the open-circuit voltage of a battery. The method involves placing the battery in a pretreatment zone for temperature pretreatment to bring its temperature close to a preset reference temperature. The pretreated battery is then transferred to a constant-temperature testing zone where the temperature of the battery's tabs is controlled to maintain a preset temperature range. While the tab temperature is within this range, the open-circuit voltage, internal resistance, and tab temperature are simultaneously collected. These values are then input into a pre-calibrated compensation model to calculate and output the final open-circuit voltage after temperature compensation. This pretreatment process eliminates measurement deviations caused by inconsistent initial battery temperatures before the battery is transferred to the constant-temperature testing zone with controlled tab temperature. To improve the stability and consistency of temperature at measurement points, open-circuit voltage, internal resistance, and temperature values are simultaneously collected under stable temperature conditions. After obtaining a complete and correlated dataset, these values are input into a pre-calibrated compensation model to achieve precise compensation for temperature factors. This eliminates the interference of temperature drift on the test results, leading to more accurate open-circuit voltage values. This improves test accuracy and stability, and enhances the reliability of battery performance evaluation. Therefore, this technique improves the accuracy and stability of battery open-circuit voltage testing, thereby enhancing the reliability of battery performance evaluation. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a flowchart of a battery open-circuit voltage testing method provided in an embodiment of the present invention.
[0018] Figure 2 This is a structural block diagram of a battery open-circuit voltage testing device provided in an embodiment of the present invention.
[0019] Figure 3 This is a structural diagram of an electronic device for testing the open-circuit voltage of a battery, provided as an embodiment of the present invention. Detailed Implementation
[0020] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0021] To enable those skilled in the art to better understand the solutions of this application, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0022] In the embodiments of this application, "at least one" refers to one or more; "multiple" refers to two or more. In the description of this application, the terms "first," "second," "third," etc., are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.
[0023] In this specification, references such as "one embodiment" or "some embodiments" mean that one or more embodiments of this application include the specific features, structures, or characteristics described in connection with that embodiment. Therefore, the terms "comprising," "including," "having," and variations thereof in this specification all mean "including but not limited to," unless otherwise specifically emphasized. It should be noted that in the embodiments of this application, "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone.
[0024] It should be noted that, in the embodiments of the present invention, when a component is referred to as being "fixed to" another component, it can be directly on the other component or an intervening component may be present. When a component is considered to be "connected to" another component, it can be directly connected to the other component or an intervening component may be present simultaneously. When a component is considered to be "set on" another component, it can be directly set on the other component or an intervening component may be present simultaneously. Furthermore, in the embodiments of this application, "connection" can also be understood as an electrical connection; the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components. The terms "vertical," "horizontal," "left," "right," and similar expressions used in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the present invention.
[0025] Furthermore, in embodiments of the present invention, it should be understood that the at least one controller disclosed herein may include various microprocessors, integrated circuits, storage devices (e.g., flash memory, random access memory (RAM), read-only memory (ROM), electrically programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or other suitable variations), and software that cooperates to perform the operations disclosed herein. In addition, the at least one controller disclosed herein utilizes one or more microprocessors to execute a computer program contained in a non-transitory computer-readable medium, the computer program being programmed to perform any number of the disclosed functions. Furthermore, the controller provided herein includes a housing and various numbers of microprocessors, integrated circuits, and storage devices (e.g., flash memory, random access memory (RAM), read-only memory (ROM), electrically programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM)) located within the housing. The disclosed controller also includes hardware-based inputs and outputs for receiving data from and sending data to other hardware-based devices discussed herein, respectively.
[0026] Please see Figure 1 , Figure 1 This is a flowchart of a battery open-circuit voltage testing method provided by an embodiment of the present invention. The battery open-circuit voltage testing method provided by an embodiment of the present invention includes the following steps: Step S100: Place the battery in the pretreatment area for temperature pretreatment so that the temperature of the battery approaches a preset reference temperature; The process of placing the battery in a pretreatment zone for temperature pretreatment to bring its temperature close to a preset reference temperature includes placing the battery in a static or slowly heated or cooled manner to bring its temperature close to the preset reference temperature. The preset reference temperature is 25℃ ± 1℃.
[0027] Specifically, the batteries under test can be transported to a specific station in the pre-processing area using automated transfer equipment, such as a robotic arm or conveyor belt. The pre-processing area is equipped with a temperature control system capable of regulating the battery temperature. This temperature control system can take the form of a constant-temperature air bath or a heat-conducting plate, and can gradually bring the battery temperature closer to a preset reference temperature (24°C to 26°C) based on its initial temperature through static or slow heating or cooling. During the temperature pre-processing, the system can monitor the battery surface temperature in real time using temperature sensors and adjust the heating or cooling power accordingly, ensuring the battery temperature changes at an appropriate rate and avoiding excessive temperature gradients that could lead to uneven internal temperature distribution. Once the battery surface temperature reaches the preset reference temperature range and remains stable for a period of time, the temperature pre-processing is considered complete, and the battery can proceed to the next step. It is important to note that during open-circuit voltage testing, significant differences in the initial temperatures of different batteries will directly lead to measurement deviations, affecting test accuracy. By performing temperature pre-processing on the batteries in the pre-processing area, the temperature of all batteries under test can be brought closer to the same preset reference temperature, effectively eliminating measurement deviations caused by inconsistent initial battery temperatures.
[0028] Furthermore, batteries can be categorized into different pretreatment levels based on the difference between their initial and target temperatures. Batteries with significant temperature differences can undergo initial coarse adjustment, such as rapid adjustment using a fan, followed by fine adjustment, such as precise temperature control using a heat-conducting plate, to improve pretreatment efficiency. Alternatively, multiple pretreatment stations can be set up, each equipped with an independent temperature control system and monitoring device, allowing multiple batteries to undergo temperature pretreatment simultaneously, thus improving testing efficiency. Multiple temperature sensors can be installed in the pretreatment area to monitor the temperature at different locations on the battery surface, ensuring uniform battery temperature distribution.
[0029] Step S200: Transfer the pretreated battery to a constant temperature test area and control the temperature of the battery tabs so that the temperature of the tabs is within a preset temperature range. The process of transferring the pretreated battery to a constant-temperature testing area and controlling the temperature of the battery's tabs to keep them within a preset temperature range includes using a semiconductor temperature control element to control the temperature of the battery's tabs within the preset temperature range. The preset temperature range is 25℃ ± 0.5℃, and the semiconductor temperature control element can be a Peltier effect semiconductor temperature control element.
[0030] Specifically, Peltier effect semiconductor temperature control elements operate based on the Peltier effect. When current flows through a circuit composed of different semiconductor materials, heat absorption or release occurs at the junctions of different conductors depending on the direction of the current. By controlling the magnitude and direction of the current, precise heating or cooling of the battery tabs can be achieved. For example, integrating the Peltier effect semiconductor temperature control element with a high-precision temperature sensor in a fixture, directly clamping it to the positive and negative tabs of the battery, allows for real-time monitoring of the tab temperature. The operating state of the Peltier effect semiconductor temperature control element is dynamically adjusted based on the measurement results, ensuring the tab temperature remains stable within a preset temperature range. Because the battery tabs are in direct contact with the external environment, they are easily affected by ambient temperature fluctuations. Even if the battery body temperature is relatively stable, the tab temperature may still change. These changes in tab temperature affect the local temperature of the active materials inside the battery through heat conduction, influencing the electrochemical equilibrium near the measurement point. Changes in the electrochemical equilibrium state lead to fluctuations in the open-circuit voltage measurement, reducing test accuracy. By actively controlling the temperature of the electrode using a semiconductor temperature control element, the electrode temperature can be stabilized within the range of 24.5℃ to 25.5℃. This reduces the impact of temperature fluctuations on the measurement results, improves the stability and consistency of the temperature at the measurement point, and is beneficial for high-precision open-circuit voltage testing.
[0031] It is worth mentioning that a multi-stage cascaded Peltier effect semiconductor temperature control element approach can be adopted. For example, the first-stage Peltier effect semiconductor temperature control element is used for wide-range temperature regulation, while subsequent stages are used for fine-tuned temperature control, achieving higher temperature control accuracy. Alternatively, independent temperature control systems can be set up for the positive and negative electrodes of the battery, enabling independent temperature control of the two electrodes and avoiding temperature inconsistencies caused by differences in electrode materials or locations. Multiple high-precision temperature sensors can be placed at different locations on the electrodes to achieve accurate monitoring of temperature distribution and avoid measurement errors caused by temperature gradients. For example, miniature resistance temperature detectors or thermocouple arrays can be used to improve the spatial resolution of temperature monitoring. Temperature barriers or airflow control systems can be set up in the constant-temperature testing area to reduce the interference of external environmental temperature fluctuations on electrode temperature control. Step S300: When the temperature of the electrode tab is within a preset temperature range, the open circuit voltage value, internal resistance value and temperature value of the battery are collected simultaneously. Specifically, once the temperature of the battery tabs is monitored to be stable within a preset temperature range and maintained for a predetermined period of time, the main controller of the test system can trigger a data acquisition operation to simultaneously acquire the battery's open-circuit voltage, internal resistance, and tab temperature. This can be achieved by using a high-precision voltage measurement module, an internal resistance measurement module, and a temperature acquisition module 220. The voltage measurement module uses a high-precision digital voltmeter directly connected to the battery tabs to eliminate the influence of wire resistance on the measurement results. The internal resistance measurement module uses an AC internal resistance test method to measure the battery's AC internal resistance. The temperature acquisition module 220 uses a high-precision temperature sensor integrated with the tab temperature control system to monitor the tab temperature in real time. This simultaneous acquisition refers to acquiring the battery's open-circuit voltage, internal resistance, and tab temperature values at the same time point or within a very short time window, ensuring that the acquired data reflects the battery's characteristics under the same conditions. Since both the battery's open-circuit voltage and internal resistance are affected by temperature, even with temperature control measures during battery testing, slight fluctuations in tab temperature may still occur, affecting the measurement results. If open-circuit voltage, internal resistance, and temperature values are collected separately at different time points, the collected data may not accurately reflect the correspondence between parameters due to changes in battery state. By collecting open-circuit voltage, internal resistance, and temperature values simultaneously, the state of the battery at the same moment can be reflected, accurately capturing the interrelationship between parameters and providing accurate input for the subsequent temperature compensation model, making the compensation results more reliable.
[0032] It is important to note that, under stable tab temperature conditions, multiple data acquisitions should be performed, and the average value should be used as the final result. This can reduce the impact of random errors on the measurement results. For example, a weighted average algorithm can be used to filter out outliers, thereby improving data reliability. Depending on the battery type and capacity, the sampling time window and sampling frequency can also be dynamically adjusted. For example, a longer sampling window can be used for large-capacity batteries to obtain more stable measurement results, while a shorter sampling window can be used for small-capacity batteries to reduce the impact of self-discharge on the measurement results.
[0033] Step S400: Input the collected open-circuit voltage value, internal resistance value and temperature value into a pre-calibrated compensation model, calculate and output the final open-circuit voltage value after temperature compensation by the compensation model.
[0034] The process involves inputting the collected open-circuit voltage, internal resistance, and temperature values into a pre-calibrated compensation model, calculating and outputting the final open-circuit voltage value after temperature compensation by the compensation model. This includes pre-measuring the actual open-circuit voltage values of a specific battery model under multiple different temperature conditions; establishing a three-dimensional correspondence between the actual temperature, actual internal resistance, and actual open-circuit voltage deviation; generating the compensation model through data fitting; and using the compensation model to calculate and output the final open-circuit voltage value after compensation based on the input open-circuit voltage, internal resistance, and temperature values.
[0035] Specifically, by selecting sample batteries of a specific model, the actual open-circuit voltage of the batteries is measured under multiple different temperature conditions. For each temperature point, the open-circuit voltage and internal resistance under different states of charge are measured. For example, using the open-circuit voltage at 25℃ as a benchmark, the deviation of the open-circuit voltage under other temperature conditions is calculated, establishing a three-dimensional correspondence between the actual temperature, actual internal resistance, and actual open-circuit voltage deviation. Then, a compensation model is generated through data fitting, such as multiple regression analysis. The open-circuit voltage, internal resistance, and temperature values synchronously collected in step S120 are used as input parameters and input into the pre-calibrated compensation model. The compensation model calculates the corresponding open-circuit voltage compensation value based on the input temperature and internal resistance values. Then, the original open-circuit voltage value and the compensation value are calculated, such as by addition and subtraction, to obtain the final open-circuit voltage value after temperature compensation. At this time, the system outputs and records the final open-circuit voltage value as the basis for battery performance evaluation. The aforementioned compensation model can be implemented in various forms, such as lookup tables, polynomial functions, or neural networks. In practical applications, a three-dimensional lookup table combined with interpolation algorithms can be used. This involves finding the closest data point in a pre-established three-dimensional table based on the input temperature and internal resistance values, and then calculating the accurate compensation value through interpolation. Since the battery's open-circuit voltage has a functional relationship with temperature, temperature changes will cause deviations in the open-circuit voltage. These deviations are not only directly related to temperature but also to the battery's internal state, such as internal resistance. Therefore, both temperature and internal resistance need to be considered. By measuring the battery's open-circuit voltage and internal resistance under multiple temperature conditions, a three-dimensional correspondence between temperature, internal resistance, and open-circuit voltage deviation can be established. Based on this three-dimensional correspondence, a compensation model can be constructed to predict the open-circuit voltage deviation under arbitrary temperature and internal resistance conditions. By correcting the deviation between the measured original open-circuit voltage value and the model's prediction, an open-circuit voltage value closer to that under standard conditions can be obtained. This effectively eliminates the interference of temperature drift on the test results and improves the accuracy and consistency of open-circuit voltage measurement.
[0036] It is important to note that machine learning algorithms, such as neural networks, can also be used to analyze large amounts of historical test data, automatically optimizing the structure and parameters of the compensation model to improve its generalization ability and prediction accuracy. Furthermore, a real-time calibration mechanism should be implemented, such as periodically testing standard batteries at different temperatures to verify the accuracy of the compensation model and fine-tuning it based on the verification results, thereby improving the stability of the compensation effect during long-term use. For different types of batteries, such as lithium-ion batteries, lead-acid batteries, or nickel-metal hydride batteries, a dedicated compensation model library should be established. The system can automatically select the appropriate compensation model based on the type of battery being tested, thus expanding the applicability of the testing method.
[0037] The battery open-circuit voltage testing method provided in this embodiment of the invention further includes automatically sorting the batteries according to the final open-circuit voltage value.
[0038] Specifically, open-circuit voltage sorting standards can be set according to the battery model, specifications, and application requirements. For example, for a certain type of lithium-ion battery, the following grading standards can be set: Grade A: final open-circuit voltage value within ±0.5mV of the nominal value; Grade B: final open-circuit voltage value within ±1.0mV of the nominal value; Grade C: final open-circuit voltage value within ±2.0mV of the nominal value. Failure is considered to be outside these ranges. The testing system receives the final open-circuit voltage value output from step S130 above and compares it with the preset sorting standards to determine the battery's grade. Based on the judgment result, it controls automated sorting equipment, such as a robotic arm or conveyor belt diversion system, to transfer the batteries to the corresponding collection area or production line. The sorting equipment can include multiple exit channels, each corresponding to a battery grade. The system can automatically record the sorting results for each battery, including serial number, test time, final open-circuit voltage value, and sorting grade information, to generate a complete test report for subsequent traceability and statistical analysis. An anomaly handling mechanism can also be set up. When an anomaly occurs, such as significantly abnormal test results or sorting equipment malfunction, the system will issue an alarm and pause the sorting process, awaiting manual intervention. By accurately measuring the open-circuit voltage of batteries and performing automatic sorting, batteries with similar performance can be grouped together, improving the consistency of the battery pack, reducing imbalances during charging and discharging, extending the battery pack's lifespan, and improving application reliability. Furthermore, sorting standards can be dynamically adjusted based on factors such as production batch, raw material source, and production process to adapt to the characteristic differences of different batches of batteries, improving the targeting of sorting. For batteries near boundary values, a secondary testing and sorting mechanism can be set up. Through repeated testing, the accuracy of sorting is improved, and a visualization system displays sorting statistics, yield rate, and distribution information of each grade in real time, facilitating production management and quality control.
[0039] To provide a detailed explanation of the battery open-circuit voltage testing device provided by the present invention, the above embodiments have described a battery open-circuit voltage testing method in detail. Based on the same inventive concept, this application also provides a battery open-circuit voltage testing device.
[0040] Please see Figure 2 , Figure 2 This is a structural block diagram of a battery open-circuit voltage testing device provided in an embodiment of the present invention. The device includes a pre-processing module 200, a constant-temperature testing module 210, a data acquisition module 220, and a calculation module 230. The pre-processing module 200 places the battery in a pre-processing area for temperature pre-processing to bring the battery temperature close to a preset reference temperature. The constant-temperature testing module 210 transfers the pre-processed battery to the constant-temperature testing area and controls the temperature of the battery's tabs to keep them within a preset temperature range. The data acquisition module 220 simultaneously acquires the battery's open-circuit voltage, internal resistance, and tab temperature while the tab temperature is within the preset temperature range. The calculation module 230 inputs the acquired open-circuit voltage, internal resistance, and temperature values into a pre-calibrated compensation model, calculates, and outputs the final open-circuit voltage value after temperature compensation by the compensation model. The temperature control platform of the pre-processing module 200 includes a heat-conducting plate or a PTC heater for heating or cooling the battery.
[0041] In this embodiment, the preprocessing module 200 is used to place the battery in the preprocessing area for temperature preprocessing so that the battery temperature approaches the preset reference temperature; the constant temperature testing module 210 is used to transfer the preprocessed battery to the constant temperature testing area and control the temperature of the battery tabs so that the temperature of the tabs is within the preset temperature range; the acquisition module 220 is used to simultaneously acquire the battery's open circuit voltage value, internal resistance value, and tab temperature value when the temperature of the tabs is within the preset temperature range; the calculation module 230 is used to input the acquired open circuit voltage value, internal resistance value, and temperature value into a pre-calibrated compensation model, calculate and output the final open circuit voltage value after temperature compensation by the compensation model. This process involves pre-treating the battery in a pre-processing zone to eliminate measurement deviations caused by inconsistent initial battery temperatures. The battery is then transferred to a constant-temperature testing zone where the tabs are temperature-controlled, improving the stability and consistency of the measurement points. Under stable temperature conditions, open-circuit voltage, internal resistance, and temperature values are simultaneously collected. After obtaining a complete and correlated dataset, these values are input into a pre-calibrated compensation model to accurately compensate for temperature factors, eliminating the interference of temperature drift on the test results. This yields more accurate open-circuit voltage values, improving test precision and stability, and enhancing the reliability of battery performance evaluation. Therefore, this technique effectively improves the precision and stability of battery open-circuit voltage testing, thereby enhancing the reliability of battery performance evaluation.
[0042] To provide a detailed explanation of the electronic device for testing the open-circuit voltage of a battery provided by the present invention, the above embodiments have described a method for testing the open-circuit voltage of a battery in detail. Based on the same inventive concept, this application also provides an electronic device for testing the open-circuit voltage of a battery.
[0043] Please see Figure 3 , Figure 3 This is a structural diagram of an electronic device for testing the open-circuit voltage of a battery according to an embodiment of the present invention. The electronic device includes a memory 310, a processor 320, and a computer program 311 stored in the memory 310 and executable on the processor 320. When the processor 320 executes the program, it performs the following steps: placing the battery in a pre-processing area for temperature pre-processing to bring the battery temperature close to a preset reference temperature; transferring the pre-processed battery to a constant-temperature testing area and controlling the temperature of the battery's tabs to keep the tab temperature within a preset temperature range; simultaneously acquiring the battery's open-circuit voltage, internal resistance, and tab temperature while the tab temperature is within the preset temperature range; inputting the acquired open-circuit voltage, internal resistance, and temperature values into a pre-calibrated compensation model, calculating and outputting the final open-circuit voltage value after temperature compensation by the compensation model.
[0044] This invention provides an electronic device for testing the open-circuit voltage of a battery. When the processor 320 executes a program, it performs the following steps: placing the battery in a pre-processing area for temperature pre-processing to bring the battery temperature close to a preset reference temperature; transferring the pre-processed battery to a constant-temperature testing area and controlling the temperature of the battery's tabs to keep them within a preset temperature range; simultaneously acquiring the battery's open-circuit voltage, internal resistance, and tab temperature values while the tab temperature is within the preset temperature range; inputting the acquired open-circuit voltage, internal resistance, and temperature values into a pre-calibrated compensation model, calculating and outputting the final open-circuit voltage value after temperature compensation by the compensation model. This achieves the desired effect during pre-processing. The battery undergoes temperature pretreatment to eliminate measurement deviations caused by inconsistent initial battery temperatures. The battery is then transferred to a constant-temperature testing area, and the tabs are temperature-controlled to improve the stability and consistency of the measurement points. Under stable temperature conditions, open-circuit voltage, internal resistance, and temperature values are simultaneously collected. After obtaining a complete and correlated dataset, the collected open-circuit voltage, internal resistance, and temperature values are input into a pre-calibrated compensation model to achieve precise compensation for temperature factors. This eliminates the interference of temperature drift on the test results, resulting in more accurate open-circuit voltage values. This improves test accuracy and stability, and enhances the reliability of battery performance evaluation. Therefore, this method achieves the technical effect of improving test accuracy and stability during battery open-circuit voltage testing, thereby enhancing the reliability of battery performance evaluation.
[0045] In some embodiments, the apparatus provided in this disclosure may also have functions or included modules that can be used to perform the methods described in the above method embodiments. The specific implementation can be referred to the description of the above method embodiments, and for the sake of brevity, it will not be repeated here. The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here. In the several embodiments provided in this application, it should be understood that the disclosed methods and apparatus can be implemented in other ways. For example, the apparatus implementations described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms. Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods of various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks. Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A method for testing the open-circuit voltage of a battery, characterized in that, The battery open-circuit voltage test method includes The battery is placed in a pretreatment area for temperature pretreatment so that the temperature of the battery approaches a preset reference temperature. The pretreated battery is transferred to a constant temperature test area, and the temperature of the battery tabs is controlled so that the temperature of the tabs is within a preset temperature range. When the temperature of the electrode tab is within a preset temperature range, the open-circuit voltage, internal resistance, and temperature of the electrode tab of the battery are collected simultaneously. The collected open-circuit voltage, internal resistance, and temperature values are input into a pre-calibrated compensation model, which calculates and outputs the final open-circuit voltage value after temperature compensation by the compensation model.
2. The battery open-circuit voltage testing method according to claim 1, characterized in that, The step of placing the battery in the pretreatment area for temperature pretreatment to bring the battery temperature closer to the preset reference temperature includes placing the battery in a static or slowly heated or cooled manner to bring the battery temperature closer to the preset reference temperature.
3. The battery open-circuit voltage testing method according to claim 1, characterized in that, The preset reference temperature is 25℃±1℃.
4. The battery open-circuit voltage test method according to claim 1, characterized in that, The step of transferring the pretreated battery to a constant temperature testing area and controlling the temperature of the battery tabs to keep the temperature of the tabs within a preset temperature range includes controlling the temperature of the battery tabs using a semiconductor temperature control element to keep the temperature of the tabs within a preset temperature range.
5. The battery open-circuit voltage test method according to claim 4, characterized in that, The preset temperature range is 25℃±0.5℃.
6. The battery open-circuit voltage test method according to claim 1, characterized in that, The process involves inputting the collected open-circuit voltage, internal resistance, and temperature values into a pre-calibrated compensation model, calculating and outputting the final open-circuit voltage value after temperature compensation by the compensation model, including the actual open-circuit voltage values of a specific battery model measured under multiple different temperature conditions. A three-dimensional correspondence is established between the actual temperature, the actual internal resistance value, and the actual open-circuit voltage deviation; the compensation model is generated through data fitting; the compensation model is used to calculate and output the final open-circuit voltage value after compensation by the compensation model based on the input open-circuit voltage value, the internal resistance value, and the temperature value.
7. The battery open-circuit voltage test method according to claim 1, characterized in that, The battery open-circuit voltage test method also includes automatically sorting the batteries based on the final open-circuit voltage value.
8. A battery open-circuit voltage testing device, characterized in that, The battery open-circuit voltage testing device includes The pretreatment module is used to place the battery in the pretreatment area for temperature pretreatment so that the temperature of the battery approaches a preset reference temperature. The constant temperature test module is used to transfer the pre-treated battery to the constant temperature test area and control the temperature of the battery's tabs so that the temperature of the tabs is within a preset temperature range. The acquisition module is used to simultaneously acquire the open-circuit voltage, internal resistance, and temperature of the electrode tab when the temperature of the electrode tab is within a preset temperature range. The calculation module is used to input the collected open-circuit voltage value, internal resistance value and temperature value into a pre-calibrated compensation model, calculate and output the final open-circuit voltage value after temperature compensation by the compensation model.
9. The battery open-circuit voltage testing device according to claim 8, characterized in that, The temperature control platform of the pretreatment module includes a heat-conducting plate or a PTC heater, which is used to heat or cool the battery.
10. An electronic device for testing the open-circuit voltage of a battery, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it performs the following steps: The battery is placed in a pretreatment area for temperature pretreatment so that the temperature of the battery approaches a preset reference temperature. The pretreated battery is transferred to a constant temperature test area, and the temperature of the battery tabs is controlled so that the temperature of the tabs is within a preset temperature range. When the temperature of the electrode tab is within a preset temperature range, the open-circuit voltage, internal resistance, and temperature of the electrode tab of the battery are collected simultaneously. The collected open-circuit voltage, internal resistance, and temperature values are input into a pre-calibrated compensation model, which calculates and outputs the final open-circuit voltage value after temperature compensation by the compensation model.