Battery performance determination method and device and nonvolatile storage medium

Abstract

The invention discloses a battery performance determination method and device and a nonvolatile storage medium. The method comprises the following steps: acquiring internal resistance data of a target three-electrode battery, the internal resistance data being obtained by performing impedance test on the target three-electrode battery based on a plurality of impedance test frequencies; acquiring a three-electrode potential and a charging current when the target three-electrode battery is charged; compensating the three-electrode potential based on the internal resistance data and the charging current to obtain the compensated potential of the target three-electrode battery; and determining the battery performance of the target three-electrode battery based on the compensated potential. According to the invention, the technical problem that the test result is inaccurate due to the fact that a plurality of structures exist in the current battery, certain internal resistance exists, and the influence on the performance test in a fast charging scene is large is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery performance, in particular to a battery performance determination method and device and a nonvolatile storage medium. BACKGROUND

[0002] Batteries, especially lithium-ion batteries, are increasingly widely used in modern life, from portable electronic devices to electric vehicles, and their performance is self-evident. As a key to improving battery efficiency and user experience, fast charging technology has developed rapidly in recent years. However, the accurate testing of battery performance in fast charging scenarios faces a series of technical challenges, especially due to the complexity of the internal structure of the battery and the existence of internal resistance, which often leads to a large deviation between the test results and the true performance of the battery. Under fast charging conditions, the battery needs to withstand a high charging current. At this time, the internal resistance characteristics of the battery become particularly important, because the internal resistance will cause a potential drop (voltage drop), affecting the potential measurement results during the battery charging process, resulting in inaccurate measurement results.

[0003] At present, there is no effective solution to the above problems. SUMMARY

[0004] The embodiments of the present application provide a battery performance determination method, device and nonvolatile storage medium to at least solve the technical problem that there are many structures in the current battery, there is a certain internal resistance, which has a great influence on the performance test under fast charging scenario, resulting in inaccurate test results.

[0005] According to an aspect of an embodiment of the present application, a battery performance determination method is provided, comprising: obtaining internal resistance data of a target three-electrode battery, wherein the internal resistance data is obtained by impedance testing of the target three-electrode battery based on a plurality of impedance testing frequencies; obtaining a three-electrode potential and a charging current when charging the target three-electrode battery; compensating the three-electrode potential based on the internal resistance data and the charging current to obtain a compensated potential of the target three-electrode battery; and determining the battery performance of the target three-electrode battery based on the compensated potential.

[0006] Optionally, the target three-electrode battery is a battery obtained by removing an insulating coating of a first preset thickness from the surface of one end of a copper wire, implanting the copper wire between the negative electrode and the battery separator in an initial battery, and packaging the copper wire and the negative electrode apart using a separator base film with a thickness not exceeding a second preset thickness.

[0007] Optionally, compensating the three-electrode potential based on the internal resistance data and the charging current to obtain the compensated potential of the target three-electrode battery comprises: compensating the three-electrode potential based on the internal resistance data and the charging current using a preset formula to obtain the compensated potential of the target three-electrode battery, wherein the preset formula is V is the compensated potential, V0 is the three-electrode potential, I0 is the charging current, and R0 is the internal resistance data.

[0008] Optionally, the internal resistance data of the target three-electrode battery is obtained, including: acquiring the voltage and response charging current of the target three-electrode battery after applying AC signals at multiple impedance test frequencies; and determining the internal resistance data of the target three-electrode battery based on the voltage and response charging current corresponding to each of the multiple impedance test frequencies.

[0009] Optionally, the battery performance of the target three-electrode battery is determined based on the compensated potential, including: determining the compensated potential of the target three-electrode battery under various charging parameters; determining charging parameters whose compensated potentials are outside the preset safe potential range as abnormal charging parameters; and determining the battery performance of the target three-electrode battery based on the abnormal charging parameters.

[0010] According to another aspect of the present invention, a battery performance determination apparatus is also provided, comprising: a host computer for setting multiple impedance test frequencies and initiating impedance testing; an impedance test module for performing impedance testing on a target three-electrode battery, obtaining internal resistance data of the target three-electrode battery, and transmitting the internal resistance data to a mid-level computer; a charge / discharge module for acquiring the three-electrode potential and charging current when charging the target three-electrode battery; and a mid-level computer for compensating the three-electrode potential based on the internal resistance data and charging current, obtaining the compensated potential of the target three-electrode battery, and determining the battery performance of the target three-electrode battery based on the compensated potential.

[0011] According to another aspect of the present invention, a non-volatile storage medium is also provided, the non-volatile storage medium including a stored program, wherein, when the program is running, the device where the non-volatile storage medium is located is controlled to execute any of the above-described battery performance determination methods.

[0012] According to another aspect of the present invention, a computer device is also provided, the computer device including a processor, the processor being configured to run a program, wherein the program, when running, executes any of the above-described methods for determining battery performance.

[0013] According to another aspect of the present invention, a computer program product is also provided, including a computer program that, when executed by a processor, implements the method for determining any of the above-described battery performance characteristics.

[0014] In this embodiment of the invention, a method for determining battery performance is employed. This involves acquiring the internal resistance data of a target three-electrode battery, obtained by performing impedance tests on the target three-electrode battery at multiple impedance test frequencies. The method also involves acquiring the three-electrode potential and charging current during charging of the target three-electrode battery. Based on the internal resistance data and charging current, the three-electrode potential is compensated to obtain the compensated potential of the target three-electrode battery. Based on the compensated potential, the battery performance of the target three-electrode battery is determined. This achieves the goal of accurately detecting the performance of the three-electrode battery in fast charging mode, thereby improving the technical effect of increasing the accuracy of battery performance testing. Furthermore, it solves the technical problem that current batteries have multiple structures and inherent internal resistance, which significantly affects performance testing in fast charging scenarios, leading to inaccurate test results. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0016] Figure 1 A hardware block diagram of a computer terminal for implementing a method for determining battery performance is shown.

[0017] Figure 2 This is a flowchart illustrating a method for determining battery performance according to an embodiment of the present invention.

[0018] Figure 3 This is a structural block diagram of a battery performance determination device provided according to an embodiment of the present invention. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] According to an embodiment of the present invention, a method embodiment for determining battery performance is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0022] The method embodiment provided in Embodiment 1 of this application can be executed on a mobile terminal, computer terminal, or similar computing device. Figure 1 A hardware block diagram of a computer terminal for determining battery performance is shown. Figure 1 As shown, the computer terminal 10 may include one or more processors (shown as 102a, 102b, ..., 102n in the figure) (the processor may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of a BUS bus), a network interface, a power supply, and / or a camera. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the aforementioned electronic device. For example, computer terminal 10 may also include... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0023] It should be noted that the aforementioned one or more processors and / or other data processing circuits are generally referred to herein as "data processing circuits". These data processing circuits may be embodied, in whole or in part, in software, hardware, firmware, or any other combination thereof. Furthermore, the data processing circuits may be a single, independent processing module, or may be integrated, in whole or in part, into any other element within the computer terminal 10. As involved in the embodiments of this application, the data processing circuits serve as a processor control mechanism (e.g., selection of a variable resistor termination path connected to an interface).

[0024] The memory 104 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the battery performance determination method in this embodiment of the invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory 104, thereby realizing the battery performance determination method of the aforementioned application. The memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor, and these remote memories can be connected to the computer terminal 10 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0025] The display can be, for example, a touchscreen liquid crystal display (LCD) that allows the user to interact with the user interface of the computer terminal 10.

[0026] Figure 2 This is a flowchart illustrating a method for determining battery performance according to an embodiment of the present invention, as shown below. Figure 2 As shown, the method includes the following steps:

[0027] Step S202: Obtain the internal resistance data of the target three-electrode battery, wherein the internal resistance data is obtained by performing impedance tests on the target three-electrode battery based on multiple impedance test frequencies.

[0028] Optionally, the development of fast charging technology requires batteries to absorb a large amount of electrical energy in a short time without compromising battery health or safety. During fast charging or discharging tests, changes in the battery's internal impedance affect the measured potential, especially under high current, where the internal resistance effect is more pronounced. Testing at multiple frequencies allows for more accurate internal resistance data, which helps correct potential measurement errors in fast charging tests, making the test results more reliable and closer to the battery's true performance boundaries. Among these, the three-electrode battery is a special battery configuration primarily used for electrochemical research and precise measurement of battery performance. Unlike traditional two-electrode batteries (i.e., batteries with positive and negative electrodes), the three-electrode battery introduces an additional reference electrode, enabling more accurate monitoring of the electrochemical reactions within the battery.

[0029] Step S204: Obtain the three-electrode potential and charging current when charging the target three-electrode battery.

[0030] Optionally, the evaluation of a battery's fast charging capability often relies on the relationship between potential and current. During fast charging, the rapid changes in potential and fluctuations in current can reflect the battery's charging efficiency and stability, helping to determine the battery's extreme charging conditions and avoid unsafe charging states such as lithium plating.

[0031] Specifically, the positive, negative, and reference electrodes of the target three-electrode battery are connected to the wires of the test equipment. Test parameters are set, including the charging mode (constant current, constant voltage, or constant power, etc.), the range of charging current and sampling frequency, and the accuracy requirements for potential measurement. During fast charging, the potentials of the positive, negative, and reference electrodes, as well as the real-time charging current, are monitored and recorded simultaneously.

[0032] Step S206: Based on the internal resistance data and charging current, the three-electrode potential is compensated to obtain the compensated potential of the target three-electrode battery.

[0033] Optionally, the three-electrode potential can be compensated based on internal resistance data and charging current to obtain the compensated potential of the target three-electrode battery. The main purpose is to more accurately reflect the true electrochemical reaction state inside the battery, especially under high-current charging (fast charging) conditions. The presence of internal resistance can cause the measured potential value to deviate from the actual value, especially at high current densities, where the internal resistance effect is more significant and may mask or distort the true performance of the battery. Compensation can eliminate this error, ensuring the accuracy of test data, which is crucial for optimizing fast charging strategies, ensuring battery safety, and extending battery life.

[0034] Step S208: Determine the battery performance of the target three-electrode battery based on the compensated potential.

[0035] Optionally, the battery performance of the target three-electrode battery can be determined based on the compensated potential. The main purpose is to more accurately evaluate the battery's true capabilities and limits under fast-charging conditions, while ensuring the battery's safety and stability during testing. The compensated potential eliminates the interference of internal resistance effects, is closer to the true potential of the battery's internal electrochemical reactions, and can also determine the true battery performance of the target three-electrode battery.

[0036] Through the above steps, the performance of three-electrode batteries in fast charging mode can be accurately detected, thereby improving the technical effect of battery performance testing accuracy. This solves the technical problem that the existence of multiple structures in batteries and their internal resistance have a significant impact on performance testing in fast charging scenarios, leading to inaccurate test results.

[0037] As an optional embodiment, the target three-electrode battery is a battery obtained by removing the insulating coating of a first preset thickness from one end of the copper wire, inserting the copper wire between the negative electrode and the battery separator in the initial battery, and then separating the copper wire from the negative electrode using a separator base film with a thickness not exceeding a second preset thickness, and then encapsulating the battery.

[0038] Optionally, a three-electrode battery is a special battery configuration primarily used for electrochemical research and precise measurement of battery performance. Unlike traditional two-electrode batteries (i.e., batteries with a positive and a negative electrode), a three-electrode battery introduces an additional reference electrode, enabling more accurate monitoring of the electrochemical reactions within the battery. Its components are: a working electrode (or active electrode), which is the positive or negative electrode in the battery, participating in the electrochemical reaction and storing or releasing electrical energy; and a reference electrode, which provides a stable potential reference point for monitoring potential changes at the working electrode. The reference electrode typically does not participate in the battery's charge-discharge reactions but maintains a stable potential; the most common types are lithium metal, silver / silver chloride (Ag / AgCl), or saturated calomel electrodes (SCE). An auxiliary electrode (or counter electrode) is used to pass current through the working electrode, forming a current loop to facilitate the electrochemical reaction or testing process. Fabrication of a three-electrode battery: Remove the insulating coating (0.3-2cm) from one end of the copper wire and insert this section between the negative electrode and the separator of the primary battery; use a separator base film with a thickness of less than or equal to 5um to separate the copper wire from the negative electrode; complete the encapsulation of the battery to form a three-electrode battery.

[0039] Specifically, a copper wire of a certain diameter is selected, and then the insulating coating of a first preset thickness (e.g., 0.3 to 2 cm) is removed from one end of its surface. This step is usually accomplished through chemical etching or physical-mechanical methods. The purpose is to allow the exposed copper wire to contact the battery's electrolyte, forming a reference electrode. A separator base film with a thickness not exceeding a second preset thickness (e.g., 5 micrometers or less) is selected. This thin film material needs to have good ion permeability and high chemical stability to ensure that it will not degrade or affect battery performance in the battery electrolyte. The treated copper wire is inserted between the negative electrode material layer of the initial battery and the existing separator (i.e., the battery separator) without damaging the battery's original structure or performance. The selected separator base film is used to cover the portion of the copper wire in contact with the negative electrode material to achieve electrical isolation between the copper wire and the negative electrode material, while ensuring that lithium ions can freely pass through the separator base film. After the copper wire is implanted and isolated, the next step is to reseal the entire battery, involving the reassembly of the battery casing, terminals, and other structural components to ensure the battery's airtightness and waterproofness. The encapsulation process requires meticulous handling to prevent the ingress of air or moisture, as these foreign substances can damage the internal electrochemical components of the battery, affecting its performance and lifespan. After battery encapsulation, a series of electrochemical tests, such as impedance testing and charge-discharge cycle testing, can be performed to verify the correctness of the three-electrode system and whether the battery performance meets expectations. By comparing the test results before and after the implantation of the reference electrode, it is confirmed that the introduction of the reference electrode has no negative impact on the overall battery performance, while accurately monitoring potential changes within the battery. Through the above manufacturing process, the final three-electrode battery possesses the ability to monitor the internal potential in real time, especially to more accurately monitor changes in the negative electrode potential. This is of paramount value for evaluating the battery's fast-charging performance, electrochemical stability, and detecting internal reaction processes.

[0040] As an optional embodiment, the three-electrode potential is compensated based on internal resistance data and charging current to obtain the compensated potential of the target three-electrode battery. This includes: using a preset formula to compensate the three-electrode potential based on internal resistance data and charging current to obtain the compensated potential of the target three-electrode battery, wherein the preset formula is as follows: V is the compensated potential, V0 is the three-electrode potential, I0 is the charging current, and R0 is the internal resistance data.

[0041] Optionally, in the fast-charging test of a three-electrode battery, the internal resistance (R0) and charging current (I0) have a significant impact on the measured potential (V0), especially when the current density is high, this effect becomes more pronounced and may cause the measured potential value to deviate from the true potential. To more accurately reflect the true electrochemical state inside the battery, i.e., the compensated potential (V), the following formula is used for potential compensation: V represents the compensated potential, signifying the true potential of the battery's negative electrode, i.e., the potential value after eliminating the internal resistance effect. V0 is the directly measured three-electrode potential, which is the negative electrode potential measured through the reference electrode under uncompensated conditions. I0 is the charging current, i.e., the current flowing through the circuit during battery charging in the test process. R0 is the battery's internal resistance data, including the total impedance of all internal components such as the separator, electrodes, structural parts, and connectors.

[0042] Specifically, before the test begins, an impedance testing module is used to perform an impedance test on the target battery to determine its internal resistance. The test frequency can cover a range from 10kHz to 0.5Hz to obtain the impedance characteristics at different frequencies, which helps to more comprehensively understand the battery's internal resistance characteristics. During the fast charging test, the charge / discharge module monitors and records the charging current in real time. Similarly, it is also necessary to continuously record the three electrode potentials, that is, the value of the negative electrode potential relative to the reference electrode during charging. Based on the formula... The calculations essentially apply Ohm's law, using measured current and internal resistance to correct for potential deviations caused by internal resistance. The compensated potential data is visualized on a host computer, allowing researchers and engineers to more accurately assess the battery's fast-charging performance, such as maximum safe charging current and energy efficiency. Based on the compensated potential changes, they can further analyze the electrochemical reaction kinetics within the battery and the impact of other factors like temperature on battery performance. Through real-time potential compensation, the fast-charging performance testing of three-electrode batteries can more accurately reflect the battery's true state, improving the accuracy of battery performance testing.

[0043] As an optional embodiment, obtaining the internal resistance data of the target three-electrode battery includes: acquiring the voltage and response charging current of the target three-electrode battery after applying AC signals at multiple impedance test frequencies; and determining the internal resistance data of the target three-electrode battery based on the voltage and response charging current corresponding to each of the multiple impedance test frequencies.

[0044] Optionally, accurate acquisition of internal resistance data is crucial for subsequent potential compensation, as it reflects the impedance characteristics of internal battery components, including separators, electrodes, structural parts, and connectors. Precise internal resistance data allows for a more accurate evaluation of battery performance under different charging conditions.

[0045] Specifically, the frequency range for impedance testing can be determined, for example, from 10kHz to 0.5Hz. Signals at different frequencies can reveal the impedance characteristics of different components within the battery. Multiple impedance testing frequencies can be set, covering a range from high to low frequencies to comprehensively understand the battery's impedance characteristics. A series of AC signals at different frequencies are applied to the target three-electrode battery as excitation to probe the battery's impedance response. The duration of each AC signal should be long enough to ensure a stable battery response; generally, a duration of at least one complete signal cycle is recommended. At each impedance testing frequency, the battery voltage and response charging current can be recorded simultaneously. Voltage is the voltage difference across the battery when the AC signal is applied; the response charging current is the battery's instantaneous current response to the AC signal. Based on the voltage and response charging current data, the impedance is calculated for each impedance testing frequency. The calculated impedance value includes both resistive and reactant components, with the resistive component being the internal resistance data, which is the focus of this step. By analyzing internal resistance data at different frequencies, we can understand how the battery's impedance characteristics change with frequency. This internal resistance data can be used to optimize battery design, such as adjusting separator thickness and improving electrode materials, to reduce internal resistance and improve the battery's fast-charging performance. Ultimately, based on the analysis of internal resistance data, we can determine the optimal charging strategy for the battery under fast-charging conditions, ensuring safe and efficient charging.

[0046] By following the detailed steps described above, the internal resistance data of the target three-electrode battery can be accurately collected, providing a solid data foundation for subsequent potential compensation and battery performance evaluation.

[0047] As an optional embodiment, the battery performance of the target three-electrode battery is determined based on the compensated potential, including: determining the compensated potential of the target three-electrode battery under various charging parameters; determining charging parameters whose compensated potentials are outside the preset safe potential range as abnormal charging parameters; and determining the battery performance of the target three-electrode battery based on the abnormal charging parameters.

[0048] Optionally, by testing the compensated potential, the safety boundaries of the battery under different charging conditions can be accurately identified, especially in fast charging scenarios. This ensures that the battery operation does not exceed the safe potential range, avoiding phenomena such as lithium plating and overheating that may lead to battery failure or safety hazards. Identifying abnormal charging parameters helps to understand the limits of battery performance, including fast charging efficiency, energy density, and cycle life. Based on this information, battery design and charging strategies can be optimized to improve the overall performance of the battery while ensuring its safety and stability during fast charging. Dynamic monitoring of the compensated potential can detect abnormal charging conditions that may lead to battery failure early, such as excessively high charging current or voltage. This helps to take preventative measures during the battery design phase or during use, reducing the failure rate and extending battery life. By identifying the compensated potentials corresponding to the target three-electrode battery under various charging parameters, and determining battery performance based on abnormal charging parameters, the aim is to achieve safe, efficient, and stable battery operation.

[0049] Specifically, the process begins by defining the charging parameters to be tested, including charging current, charging voltage, and charging time. These parameters should cover various fast-charging conditions the battery might encounter in actual use. A matrix containing various combinations of charging parameters, such as different combinations of charging current and charging time, is constructed to comprehensively evaluate the battery's performance under different conditions. For each combination of charging parameters, the target three-electrode battery is charged using a charge-discharge module, while simultaneously recording the initial potential, charging current, and battery internal resistance. A potential compensation formula is applied to calculate and record the compensated potential in real time, providing potential data that more closely approximates the actual electrochemical state inside the battery.

[0050] Secondly, based on the characteristics of battery materials and previous research experience, a predefined safe potential range is established. For lithium-ion batteries, a range is typically set to avoid lithium plating and other electrochemical instability phenomena. The compensated safe potential range is compared and analyzed; potential values ​​exceeding the safe potential range indicate potential safety hazards under the current charging conditions. If, under a certain charging parameter, the compensated potential exceeds the preset safe potential range, then that charging parameter is considered abnormal or anomaly. For example, excessively high charging current may cause the potential to drop rapidly below the safe threshold, indicating an increased risk of lithium plating. All abnormal charging parameters are marked in the test data for subsequent detailed analysis and strategy adjustments.

[0051] Finally, based on test results under normal and abnormal charging parameters, key performance indicators such as fast charging performance, energy efficiency, and safety margins of the battery are evaluated. The specific impact of abnormal charging parameters on battery performance is analyzed in detail, including issues such as shortened battery life, increased internal temperature, and premature degradation. Using this information, fast charging strategies can be adjusted, such as limiting the maximum charging current, optimizing the charging voltage curve, and improving the battery cooling system, to enhance the overall performance and safety of the battery. Weaknesses in battery materials and design are identified, such as the selection of electrode materials, separator thickness, and internal battery structural layout, allowing for targeted adjustments and improvements. Through this series of detailed steps, the performance of the target three-electrode battery under various charging parameters can be accurately determined and analyzed based on the compensated potential, providing a scientific basis for optimizing battery technology and fast charging management strategies.

[0052] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0053] Through the above description of the embodiments, those skilled in the art can clearly understand that the method for determining battery performance according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0054] According to embodiments of the present invention, a battery performance determination apparatus for implementing the above-described battery performance determination method is also provided. Figure 3 This is a structural block diagram of a battery performance determination device according to an embodiment of the present invention. As shown in the figure, the battery performance determination device includes: a host computer 302, an impedance testing module 304, a charge / discharge module 306, and a mid-level computer 308. The battery performance determination device will be described below.

[0055] The host computer 302 is bidirectionally connected to the intermediate computer 308 and is used to set multiple impedance test frequencies and start impedance tests.

[0056] The impedance testing module 304 is bidirectionally connected to the intermediate computer 308 and is used to perform impedance testing on the target three-electrode battery, obtain the internal resistance data of the target three-electrode battery, and transmit the internal resistance data to the intermediate computer.

[0057] The charge / discharge module 306 is bidirectionally connected to the intermediate unit 308 and is used to acquire the three-electrode potential and charging current when charging the target three-electrode battery.

[0058] The intermediate computer 308 is bidirectionally connected to the host computer 302, the impedance testing module 304, and the charge / discharge module 306. It is used to compensate the three-electrode potential based on the internal resistance data and the charging current to obtain the compensated potential of the target three-electrode battery, and to determine the battery performance of the target three-electrode battery based on the compensated potential.

[0059] Optionally, the impedance testing module is used to adjust the test frequency and output impedance test excitation, including but not limited to sinusoidal excitation signals. The charge / discharge module is used for battery charging and discharging functions, including but not limited to constant current, constant voltage, and constant power charge / discharge functions, and can simultaneously monitor the potentials of the positive, negative, and reference electrodes. The host computer is used for setting the parameters of each module and displaying the results. The intermediate computer is used to control the impedance module and the charge / discharge module, calculate impedance parameters, and perform error compensation calculations.

[0060] The device operates as follows:

[0061] Connect the positive terminal, negative terminal, and reference electrode of the battery to the positive terminal, negative terminal, and reference test lead of the device, respectively.

[0062] In the host computer, set the frequency used for the negative impedance in the test, as well as the charging / powering mode, and start the test;

[0063] The intermediate computer transmits the control parameters to the impedance testing module, which performs impedance testing on the battery and three electrodes. After the test, the results are fed back to the intermediate computer for impedance conversion and calculation.

[0064] Based on the measured impedance results and the set charging and discharging mode, the mid-level computer controls the charging and discharging module to perform charging and discharging tests on the battery in real time. The computer processes and compensates for errors based on the voltage and current data measured by the charging and discharging module, and feeds the results back to the charging and discharging module for testing at the next moment.

[0065] The final test results are fed back to the host computer and displayed.

[0066] It should be noted that the above-mentioned host computer 302, impedance testing module 304, charging and discharging module 306, and intermediate computer 308 are the same as the examples and application scenarios implemented in the above steps, but are not limited to the content disclosed in the above embodiments. It should be noted that the above modules, as part of the device, can run in the computer terminal 10 provided in the embodiment.

[0067] Embodiments of the present invention may provide a computer device. Optionally, in this embodiment, the computer device may be located in at least one of a plurality of network devices in a computer network. The computer device includes a memory and a processor.

[0068] The memory can be used to store software programs and modules, such as the program instructions / modules corresponding to the battery performance determination method and apparatus in this embodiment of the invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory, thereby realizing the aforementioned battery performance determination method. The memory may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory may further include memory remotely located relative to the processor, and these remote memories can be connected to a computer terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0069] The processor can access information and applications stored in memory via a transfer device to perform the following steps:

[0070] Optionally, the processor may also execute program code for the following steps: acquiring the internal resistance data of the target three-electrode battery, wherein the internal resistance data is obtained by performing impedance testing on the target three-electrode battery based on multiple impedance test frequencies; acquiring the three-electrode potential and charging current when charging the target three-electrode battery; compensating the three-electrode potential based on the internal resistance data and charging current to obtain the compensated potential of the target three-electrode battery; and determining the battery performance of the target three-electrode battery based on the compensated potential.

[0071] Optionally, the aforementioned target three-electrode battery is a battery obtained by removing the insulating coating of a first preset thickness from one end of the copper wire, inserting the copper wire between the negative electrode and the battery separator in the initial battery, and then separating the copper wire from the negative electrode using a separator base film with a thickness not exceeding a second preset thickness before encapsulation.

[0072] Optionally, the processor may also execute program code for the following steps: compensating the three-electrode potential based on internal resistance data and charging current to obtain the compensated potential of the target three-electrode battery, including: using a preset formula to compensate the three-electrode potential based on internal resistance data and charging current to obtain the compensated potential of the target three-electrode battery, wherein the preset formula is as follows: V is the compensated potential, V0 is the three-electrode potential, I0 is the charging current, and R0 is the internal resistance data.

[0073] Optionally, the processor may also execute program code for the following steps: acquiring the internal resistance data of the target three-electrode battery, including: acquiring the voltage and response charging current of the target three-electrode battery after applying AC signals at multiple impedance test frequencies; and determining the internal resistance data of the target three-electrode battery based on the voltage and response charging current corresponding to each of the multiple impedance test frequencies.

[0074] Optionally, the processor may also execute program code for the following steps: determining the battery performance of the target three-electrode battery based on the compensated potential, including: determining the compensated potential of the target three-electrode battery under various charging parameters; determining charging parameters whose compensated potentials are outside the preset safe potential range as abnormal charging parameters; and determining the battery performance of the target three-electrode battery based on the abnormal charging parameters.

[0075] This invention provides a method for determining battery performance. The method involves acquiring the internal resistance data of a target three-electrode battery, obtained by impedance testing of the target three-electrode battery at multiple impedance testing frequencies; acquiring the three-electrode potential and charging current during charging of the target three-electrode battery; compensating the three-electrode potential based on the internal resistance data and charging current to obtain the compensated potential of the target three-electrode battery; and determining the battery performance based on the compensated potential. This achieves the goal of accurately detecting the performance of three-electrode batteries in fast charging mode, thereby improving the accuracy of battery performance testing. It also solves the technical problem that current batteries have various structures and inherent internal resistance, which significantly affects performance testing in fast charging scenarios, leading to inaccurate test results.

[0076] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing the hardware related to the terminal device. The program can be stored in a non-volatile storage medium, which may include: flash drive, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc.

[0077] Embodiments of the present invention also provide a non-volatile storage medium. Optionally, in this embodiment, the aforementioned non-volatile storage medium can be used to store the program code executed by the battery performance determination method provided in the above embodiments.

[0078] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a group of computer terminals in a computer network, or in any mobile terminal in a group of mobile terminals.

[0079] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: acquiring the internal resistance data of the target three-electrode battery, wherein the internal resistance data is obtained by performing impedance testing on the target three-electrode battery based on multiple impedance test frequencies; acquiring the three-electrode potential and charging current when charging the target three-electrode battery; compensating the three-electrode potential based on the internal resistance data and charging current to obtain the compensated potential of the target three-electrode battery; and determining the battery performance of the target three-electrode battery based on the compensated potential.

[0080] Optionally, in this embodiment, the target three-electrode battery is a battery obtained by removing the insulating coating of a first preset thickness from one end of the copper wire, inserting the copper wire between the negative electrode and the battery separator in the initial battery, and then separating the copper wire from the negative electrode using a separator base film with a thickness not exceeding a second preset thickness, and then encapsulating the battery.

[0081] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: compensating the three-electrode potential based on internal resistance data and charging current to obtain the compensated potential of the target three-electrode battery, including: using a preset formula to compensate the three-electrode potential based on internal resistance data and charging current to obtain the compensated potential of the target three-electrode battery, wherein the preset formula is: V is the compensated potential, V0 is the three-electrode potential, I0 is the charging current, and R0 is the internal resistance data.

[0082] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: obtaining the internal resistance data of the target three-electrode battery, including: acquiring the voltage and response charging current of the target three-electrode battery after applying AC signals at multiple impedance test frequencies; and determining the internal resistance data of the target three-electrode battery based on the voltage and response charging current corresponding to each of the multiple impedance test frequencies.

[0083] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: determining the battery performance of the target three-electrode battery based on the compensated potential, including: determining the compensated potential of the target three-electrode battery under various charging parameters; determining charging parameters whose compensated potentials are outside a preset safe potential range as abnormal charging parameters; and determining the battery performance of the target three-electrode battery based on the abnormal charging parameters.

[0084] Embodiments of the present invention also provide a computer program product, including a computer program. Optionally, in this embodiment, when the computer program is executed by a processor, it can: acquire the internal resistance data of a target three-electrode battery, wherein the internal resistance data is obtained by performing impedance testing on the target three-electrode battery based on multiple impedance testing frequencies; acquire the three-electrode potential and charging current when charging the target three-electrode battery; compensate the three-electrode potential based on the internal resistance data and charging current to obtain the compensated potential of the target three-electrode battery; and determine the battery performance of the target three-electrode battery based on the compensated potential.

[0085] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0086] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0087] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0088] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0089] Furthermore, the functional units in the various embodiments of the present invention 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.

[0090] 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 non-volatile storage medium. Based on this understanding, the technical solution of the present invention, 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.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0091] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for determining battery performance, characterized in that, include: The internal resistance data of the target three-electrode battery is obtained, wherein the internal resistance data is obtained by performing impedance testing on the target three-electrode battery based on multiple impedance testing frequencies; The three-electrode potentials and charging currents of the target three-electrode battery during charging are obtained; The three-electrode potential is compensated based on the internal resistance data and the charging current to obtain the compensated potential of the target three-electrode battery. Based on the compensated potential, the battery performance of the target three-electrode battery is determined.

2. The method according to claim 1, characterized in that, The target three-electrode battery is obtained by removing the insulating coating of a first preset thickness from one end of the copper wire, inserting the copper wire between the negative electrode and the battery separator in the initial battery, and then sealing the copper wire with a separator base film of no more than a second preset thickness to separate the copper wire from the negative electrode.

3. The method according to claim 1, characterized in that, The step of compensating the three-electrode potential based on the internal resistance data and the charging current to obtain the compensated potential of the target three-electrode battery includes: Using a preset formula, the three-electrode potential is compensated based on the internal resistance data and the charging current to obtain the compensated potential of the target three-electrode battery, wherein the preset formula is: V is the compensated potential, V0 is the three-electrode potential, I0 is the charging current, and R0 is the internal resistance data.

4. The method according to claim 1, characterized in that, The acquisition of the internal resistance data of the target three-electrode battery includes: The voltage and response charging current of the target three-electrode battery are collected after applying AC signals at the multiple impedance test frequencies, respectively. Based on the voltage and response charging current corresponding to each of the multiple impedance test frequencies, the internal resistance data of the target three-electrode battery is determined.

5. The method according to any one of claims 1 to 4, characterized in that, Determining the battery performance of the target three-electrode battery based on the compensated potential includes: Determine the compensated potential of the target three-electrode battery under various charging parameters; Charging parameters whose compensated potential is outside the preset safe potential range are considered abnormal charging parameters. Based on the abnormal charging parameters, the battery performance of the target three-electrode battery is determined.

6. A device for determining battery performance, characterized in that, The above includes: The host computer is used to set multiple impedance test frequencies and start impedance tests. The impedance testing module is used to perform impedance testing on the target three-electrode battery, obtain the internal resistance data of the target three-electrode battery, and transmit the internal resistance data to the mid-level computer. The charge / discharge module is used to acquire the three-electrode potential and charging current when the target three-electrode battery is charged; The intermediate unit is used to compensate the three-electrode potential based on the internal resistance data and the charging current to obtain the compensated potential of the target three-electrode battery, and to determine the battery performance of the target three-electrode battery based on the compensated potential.

7. The apparatus according to claim 6, characterized in that, Also includes: The intermediate computer is also used to upload the battery performance of the target three-electrode battery to the host computer; The host computer is also used to display the battery performance of the target three-electrode battery.

8. A non-volatile storage medium, characterized in that, The non-volatile storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the non-volatile storage medium to perform the method for determining battery performance as described in any one of claims 1 to 5.

9. A computer device, characterized in that, include: Memory and processor The memory stores computer programs; The processor is configured to execute a computer program stored in the memory, wherein when the computer program is executed, the processor performs the method for determining battery performance according to any one of claims 1 to 5.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the method for determining the battery performance according to any one of claims 1 to 5.

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