Method and device for determining battery short circuit test parameters and computer equipment

Abstract

The invention discloses a battery short circuit test parameter determination method and device and computer equipment. The method comprises the following steps: acquiring test data of diaphragm breakdown voltage of a sample battery; initially setting initial short-circuit test parameters according to the test data of the diaphragm breakdown voltage; based on the initial short-circuit test parameters, performing short-circuit test on the verification battery to obtain short-circuit test data of the verification battery; whether the short-circuit test data meet preset verification conditions or not is judged, and the verification conditions are used for verifying the reasonability of the short-circuit test parameters; and taking the initial short-circuit test parameter as a target short-circuit test parameter under the condition that the short-circuit test data meets a preset verification condition. According to the invention, the technical problems of strong dependency and low reliability of battery short circuit test parameter setting experience are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery testing, and in particular to a method, device and computer equipment for determining battery short circuit test parameters. Background Art

[0002] Lithium batteries have become the preferred power source for portable electronic devices, electric vehicles, energy storage systems, etc. due to their high energy density, long cycle life, and no memory effect. However, the safety of lithium batteries has always been the focus of the industry, especially in the battery manufacturing process, short circuit detection is one of the key steps to ensure battery safety and performance.

[0003] In the production process of lithium batteries, short-circuit testing is usually performed after the film making or winding stage to detect whether there is a short-circuit risk inside the battery, such as poor contact between the pole piece and the diaphragm or internal short circuit caused by metal particles. The accuracy and reliability of short-circuit testing directly affect the process safety of the battery and the quality of the final product. Although there are various short-circuit testing methods on the market, there is a lack of unified standards, which leads to large differences and uncertainties in the setting of test parameters, bringing challenges to the production and testing of lithium batteries.

[0004] The short-circuit test methods mainly include the multimeter method, the withstand voltage / insulation method, the finished product internal resistance method, the finished product aging method and the pulse test method. Among them, the multimeter method determines whether there is a short circuit by measuring the resistance of the battery, but it cannot detect tiny internal short circuits; the withstand voltage / insulation method detects the insulation performance of the battery by applying high voltage, but high-voltage testing may cause additional damage to the battery; the finished product internal resistance method and the finished product aging method are mainly carried out after the battery is completed, and the potential short circuit risk cannot be eliminated at an early stage; the pulse test method is a newer test method that simulates short circuit conditions through short-term high-voltage pulses. It can more accurately detect short circuit problems inside the battery, but due to the complexity of its parameter settings, the effectiveness and accuracy of the test are difficult to guarantee.

[0005] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0006] The embodiments of the present invention provide a method, an apparatus and a computer device for determining battery short-circuit test parameters, so as to at least solve the technical problem that the battery short-circuit test parameter setting is highly dependent on experience and has low reliability.

[0007] According to one aspect of an embodiment of the present invention, a method for determining battery short-circuit test parameters is provided, including: obtaining test data of the diaphragm breakdown voltage of a sample battery; preliminarily setting initial short-circuit test parameters according to the test data of the diaphragm breakdown voltage; performing a short-circuit test on a verification battery based on the initial short-circuit test parameters to obtain short-circuit test data of the verification battery; judging whether the short-circuit test data meets a predetermined verification condition, wherein the verification condition is used to verify the rationality of the short-circuit test parameter; and when the short-circuit test data meets the predetermined verification condition, using the initial short-circuit test parameter as the target short-circuit test parameter. This method improves the accuracy and reliability of lithium battery short-circuit test parameter setting through scientific data analysis and verification, and is suitable for quality control in the battery manufacturing process to ensure the safety and performance of the battery.

[0008] Optionally, based on the initial short-circuit test parameters, a short-circuit test is performed on the verification battery to obtain the short-circuit test data of the verification battery, including: based on the initial short-circuit test parameters, determining a pulse signal for performing a short-circuit test on the verification battery; applying the pulse signal to both ends of the verification battery, collecting the voltage data of the verification battery, and obtaining the short-circuit test data of the verification battery. This optional embodiment can more accurately detect the short circuit situation inside the battery by precisely controlling the pulse signal, and is suitable for online detection in the battery production process, thereby improving production efficiency and product quality.

[0009] Optionally, the initial short circuit test parameters include at least one of the following: pulse charging voltage, pulse voltage holding time, fixed pulse free discharge time, voltage drop parameter in the voltage rise phase, voltage drop parameter in the continuous charging phase, voltage drop parameter in the free discharge phase, lower limit of voltage rise time, upper limit of voltage rise time. The setting of parameters in this optional embodiment can fully cover the short circuit detection of the battery in different states, is suitable for the full life cycle management of the battery, and ensures the safety and stability of the battery during use.

[0010] Optionally, the upper limit of the voltage rise time is greater than the sum of the pulse voltage holding time and the fixed pulse free discharge time. The setting method provided by this optional embodiment can ensure that there is enough time to detect possible short circuit problems during the battery charging process, which is suitable for battery charging safety detection and reduces safety accidents caused by short circuit problems during the charging process.

[0011] Optionally, the upper limit value of the voltage rise time is greater than 7 times the actually measured voltage rise time, wherein the short circuit test data includes the actually measured voltage rise time.

[0012] Optionally, before obtaining the test data of the diaphragm breakdown voltage of the sample battery, it includes: performing an original diaphragm breakdown voltage test, a stacked core diaphragm breakdown voltage test, and a baked diaphragm breakdown voltage test on the sample battery to obtain test data of the original diaphragm breakdown voltage test, test data of the stacked core diaphragm breakdown voltage test, and test data of the baked diaphragm breakdown voltage test, wherein the test data of the diaphragm breakdown voltage includes test data of the original diaphragm breakdown voltage test, test data of the stacked core diaphragm breakdown voltage test, and test data of the baked diaphragm breakdown voltage test.

[0013] Optionally, judging whether the short-circuit test data meets the predetermined verification conditions includes: determining the battery suspected of having a short-circuit problem among the verification batteries according to the short-circuit test data; disassembling and verifying the battery suspected of having a short-circuit problem to determine whether the battery suspected of having a short-circuit problem has a short-circuit problem; and determining that the short-circuit test data meets the verification conditions when the proportion of batteries with short-circuit problems among the batteries suspected of having a short-circuit problem is within a predetermined range. Through disassembly verification, the accuracy of the test results can be ensured, which is suitable for battery failure analysis and quality improvement, and improves the production yield and user satisfaction of the battery.

[0014] Optionally, when the short-circuit test data does not meet the predetermined verification conditions, the initial short-circuit test parameters are adjusted to obtain adjusted test parameters, and the verification battery is short-circuited based on the adjusted test parameters until the short-circuit test parameters corresponding to the short-circuit test data that meets the verification conditions are used as target short-circuit test parameters. The dynamic adjustment mechanism provided by this optional embodiment can continuously optimize the test parameters according to the test results, which is suitable for battery performance optimization and fault prevention, and improves the reliability and service life of the battery.

[0015] According to another aspect of an embodiment of the present invention, a device for determining battery short-circuit test parameters is also provided, including: a data acquisition module for acquiring test data of the diaphragm breakdown voltage of a sample battery; an initial setting module for preliminarily setting initial short-circuit test parameters according to the test data of the diaphragm breakdown voltage; a short-circuit test module for performing a short-circuit test on a verification battery based on the initial short-circuit test parameters to obtain short-circuit test data of the verification battery; a data verification module for determining whether the short-circuit test data meets predetermined verification conditions, wherein the verification conditions are used to verify the rationality of the short-circuit test parameters; and a parameter determination module for using the initial short-circuit test parameters as target short-circuit test parameters when the short-circuit test data meets predetermined verification conditions.

[0016] According to another aspect of the embodiments of the present invention, a computer device is provided. The computer device includes a processor, and the processor is used to run a program. When the program is run, any one of the above-mentioned methods for determining battery short-circuit test parameters is executed.

[0017] In an embodiment of the present invention, by obtaining the test data of the diaphragm breakdown voltage of the sample battery; preliminarily setting the initial short-circuit test parameters according to the test data of the diaphragm breakdown voltage; based on the initial short-circuit test parameters, performing a short-circuit test on the verification battery to obtain the short-circuit test data of the verification battery; judging whether the short-circuit test data meets the predetermined verification conditions, wherein the verification conditions are used to verify the rationality of the short-circuit test parameters; when the short-circuit test data meets the predetermined verification conditions, the initial short-circuit test parameters are used as the target short-circuit test parameters, so that the short-circuit test parameters can be accurately set, the accuracy and reliability of the battery short-circuit test can be ensured, and the production yield and safety performance of the battery can be effectively improved, and at the same time, strong technical support is provided for the fault analysis and performance improvement of the battery. This method is suitable for short-circuit testing of lithium batteries of different batches and types, and can meet the industry's high standards for battery production process control and quality assurance, laying a solid foundation for the widespread application and safe use of lithium batteries, thereby solving the technical problems of strong experience dependence and low reliability in the setting of battery short-circuit test parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 A hardware structure block diagram of a computer terminal for implementing a method for determining battery short-circuit test parameters is shown;

[0020] Figure 2 is a flow chart of a method for determining battery short-circuit test parameters provided in an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of steps for determining battery short circuit test parameters provided in accordance with an optional embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of a test result of a diaphragm breakdown voltage provided according to an optional embodiment of the present invention;

[0023] Figure 5 is a schematic diagram of a test result of a drop voltage parameter provided according to an optional embodiment of the present invention;

[0024] Figure 6 is a schematic diagram of another test result of a drop voltage parameter provided according to an optional embodiment of the present invention;

[0025] Figure 7 is a schematic diagram of qualified parameters of drop voltage parameters provided according to an optional embodiment of the present invention;

[0026] Figure 8 It is a structural block diagram of a device for determining battery short circuit test parameters provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] According to an embodiment of the present invention, a method embodiment for determining battery short-circuit test parameters is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0030] The method embodiment provided in the first embodiment of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Figure 1 The hardware structure block diagram of a computer terminal for implementing a method for determining battery short circuit test parameters is shown. Figure 1As shown, the computer terminal 10 may include one or more (102a, 102b, ..., 102n are used to illustrate) processors (the processor may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), 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 the BUS bus), a network interface, a power supply and / or a camera. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the above electronic device. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0031] It should be noted that the one or more processors and / or other data processing circuits described above may generally be referred to herein as "data processing circuits". The data processing circuits may be embodied in whole or in part as software, hardware, firmware, or any other combination thereof. In addition, the data processing circuit may be a single independent processing module, or may be incorporated in whole or in part into any of the other components in the computer terminal 10. As described in the embodiments of the present application, the data processing circuit acts as a processor control (e.g., selection of a variable resistor terminal path connected to an interface).

[0032] 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 method for determining the battery short circuit test parameters in the embodiment of the present invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory 104, that is, the method for determining the battery short circuit test parameters of the above-mentioned application program is realized. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the computer terminal 10 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0033] The display may be, for example, a touch screen liquid crystal display (LCD) that enables a user to interact with a user interface of the computer terminal 10 .

[0034] Figure 2 is a flow chart of a method for determining battery short circuit test parameters according to an embodiment of the present invention. Figure 2As shown, the method comprises the following steps:

[0035] Step S201, obtaining test data of the breakdown voltage of the diaphragm of the sample battery.

[0036] In this step, the sample battery refers to a battery selected from the mass-produced batteries to represent the performance and characteristics of the entire batch. The diaphragm breakdown voltage may include the breakdown voltage of the raw material diaphragm, the breakdown voltage of the stacked core or the wound core diaphragm, and the breakdown voltage of the diaphragm in the hot and cold states after baking. In other words, the diaphragm breakdown voltage of the sample battery under different conditions can be tested to obtain test data.

[0037] Step S202, preliminarily setting initial short-circuit test parameters according to the test data of the diaphragm breakdown voltage.

[0038] In this step, the initial short-circuit test parameters refer to a set of parameters set when starting the lithium battery short-circuit test. These parameters are set based on the test data of the diaphragm breakdown voltage. The setting of the initial parameters is the basis for subsequent testing and parameter optimization.

[0039] Step S203, performing a short circuit test on the verification battery based on the initial short circuit test parameters to obtain short circuit test data.

[0040] In this step, the verification battery refers to a battery selected from mass-produced batteries and used to verify the rationality of the short-circuit parameter settings.

[0041] Step S204, determining whether the short-circuit test data meets a predetermined verification condition.

[0042] In this step, the verification conditions refer to a series of standards and rules set to verify the rationality of the short-circuit test parameters in order to ensure the accuracy and reliability of the test data when performing a lithium battery short-circuit test.

[0043] Step S205 , when the short-circuit test data meets the predetermined verification condition, the initial short-circuit test parameters are used as final short-circuit test parameters.

[0044] Through the above steps, the short-circuit test parameters can be accurately set to ensure the accuracy and reliability of the battery short-circuit test, effectively improve the production yield and safety performance of the battery, and also provide strong technical support for battery failure analysis and performance improvement. This method is suitable for short-circuit testing of different batches and types of lithium batteries, and can meet the industry's high standards for battery production process control and quality assurance, laying a solid foundation for the widespread application and safe use of lithium batteries.

[0045] As an optional embodiment, a short circuit test is performed on a verification battery based on initial short circuit test parameters to obtain short circuit test data of the verification battery, including: determining a pulse signal for performing a short circuit test on the verification battery based on the initial short circuit test parameters; applying the pulse signal to both ends of the verification battery, collecting voltage data of the verification battery, and obtaining short circuit test data of the verification battery.

[0046] Optionally, first, based on a set of initial short-circuit test parameters, a pulse signal for short-circuit testing of the verification battery is determined, wherein the initial short-circuit test parameters may be parameters for generating pulse signals, which may specifically include pulse charging voltage, pulse holding time, free discharge time, and voltage drop threshold, etc. Specifically, a series of precisely controlled pulse signals may be generated by a pulse test instrument. These pulse signals are designed to simulate the possible short-circuit environment inside the battery, and to test the reaction of the battery under extreme conditions through instantaneous charge accumulation and release. Secondly, during the test implementation phase, the pulse signal is applied to both ends of the verification battery. During this process, a high-precision voltage acquisition device can be used to monitor the voltage changes at both ends of the battery in real time, and collect voltage dynamic data during the voltage rise, holding, and free discharge stages, providing a basis for subsequent analysis and judgment. Finally, all collected data are entered into the system and processed by data analysis software to generate a detailed test report. The report includes a graph of battery voltage changes over time, as well as information such as the specific time point and voltage drop amplitude of the short-circuit event. Through in-depth analysis of these data, it is possible to accurately determine whether the battery has a short-circuit risk, as well as the nature and possible location of the short circuit.

[0047] As an optional embodiment, the initial short circuit test parameters include at least one of the following: pulse charging voltage, pulse holding time, fixed pulse free discharge time, voltage drop parameters in the voltage rising stage, voltage drop parameters in the continuous charging stage, voltage drop parameters in the free discharge stage, lower limit value of voltage rise time, and upper limit value of voltage rise time.

[0048] Optionally, the selection of pulse charging voltage needs to be based on the voltage resistance and design specifications of the battery material to ensure that the test can effectively stimulate potential short-circuit points without causing permanent damage to the battery. The setting of pulse holding time and fixed pulse free discharge time needs to take into account the characteristics of charge accumulation and release inside the battery. By precisely controlling the holding and discharge time, the change in the charge state of the battery under short-circuit conditions can be detected to ensure the accuracy and reliability of the test. The voltage drop parameters are aimed at the voltage drop characteristics of the battery in the three key stages of voltage rise, continuous charging and free discharge. The threshold settings of these parameters can help engineers distinguish between normal voltage fluctuations and voltage drops caused by short-circuit events, avoiding misjudgment and missed detection. The lower and upper limits of the voltage rise time are used to regulate the speed of voltage change during the test to ensure the consistency of test conditions and the comparability of battery performance.

[0049] As an optional embodiment, the upper limit of the voltage rise time is greater than the sum of the pulse voltage holding time and the fixed pulse free discharge time.

[0050] Optionally, in the pulse short-circuit test of lithium batteries, ensuring that the upper limit of the voltage rise time is greater than the sum of the pulse voltage holding time and the fixed pulse free discharge time is one of the key strategies for achieving effective short-circuit risk assessment. The rationality of this setting is that it provides a sufficient observation window for the voltage rise of the battery during the charging process, so that any abnormal voltage response can be captured in time when the internal charge state of the battery changes, especially the voltage drop or other abnormal behavior related to the short-circuit phenomenon.

[0051] As an optional embodiment, the upper limit of the voltage rise time is greater than 7 times the actual measured voltage rise time, wherein the short circuit test data includes the actual measured voltage rise time. Optionally, according to the equipment requirements of the short circuit tester, the total test time should be more than 7 times the actual measured voltage rise time.

[0052] As an optional embodiment, before obtaining the test data of the diaphragm breakdown voltage of the sample battery, it includes: performing an original diaphragm breakdown voltage test, a stacked core diaphragm breakdown voltage test, and a baked diaphragm breakdown voltage test on the sample battery to obtain test data of the original diaphragm breakdown voltage test, test data of the stacked core diaphragm breakdown voltage test, and test data of the baked diaphragm breakdown voltage test, wherein the test data of the diaphragm breakdown voltage includes test data of the original diaphragm breakdown voltage test, test data of the stacked core diaphragm breakdown voltage test, and test data of the baked diaphragm breakdown voltage test.

[0053] Optionally, a variety of breakdown voltage tests can be performed on the sample battery, and the initial short-circuit test data can be set according to the breakdown voltage value obtained from the test. For example, the sample battery can be tested for the original diaphragm breakdown voltage, that is, the sample battery is not specially processed, and the diaphragm breakdown voltage test is performed; the sample battery can also be tested for the stacked core diaphragm breakdown voltage, that is, the sample battery cell is processed and then the diaphragm breakdown voltage test is performed; the sample battery can also be baked and then the diaphragm breakdown voltage test is performed. Then, the pulse charging voltage in the initial short-circuit test parameters can be set according to 20% of the minimum breakdown voltage value.

[0054] As an optional embodiment, determining whether the short-circuit test data meets predetermined verification conditions includes: determining, among the verified batteries, batteries suspected of having short-circuit problems based on the short-circuit test data; disassembling and verifying the batteries suspected of having short-circuit problems to determine whether the batteries suspected of having short-circuit problems have short-circuit problems; and determining that the short-circuit test data meets the verification conditions when the proportion of batteries with short-circuit problems among the batteries suspected of having short-circuit problems is within a predetermined range.

[0055] Optionally, first, based on the short-circuit test data, according to the preset voltage drop parameter threshold and time parameter threshold, all batteries participating in the test are preliminarily screened to identify those batteries that exhibit abnormal voltage behavior during the test; secondly, the preliminarily screened suspected short-circuit batteries are disassembled and verified to directly observe whether there are short-circuit phenomena at the physical or electrochemical level inside the battery, such as diaphragm breakdown, metal particle short-circuit, etc.; finally, based on the disassembly verification, the results are evaluated to determine whether the proportion of batteries with short-circuit problems in the suspected short-circuit batteries is within the predetermined range. The setting of the predetermined range is based on strict requirements for battery production yield and full consideration of user safety. If the proportion of actual short-circuit batteries is too high or too low, it may mean that the test parameters need to be adjusted to more accurately identify short-circuit risks. Only when this proportion falls within the predetermined reasonable range can it be confirmed that the short-circuit test data meets the verification conditions and the effectiveness and reliability of the test method are verified.

[0056] As an optional embodiment, when the short-circuit test data does not meet the predetermined verification conditions, the initial short-circuit test parameters are adjusted to obtain adjusted test parameters, and the verification battery is short-circuited based on the adjusted test parameters until the short-circuit test parameters corresponding to the short-circuit test data that meets the verification conditions are used as the target short-circuit test parameters.

[0057] Optionally, when the test data deviates from the verification conditions, the battery test results can be carefully analyzed to identify the causes of false positives or omissions in short circuit detection. This analysis may involve re-evaluation of voltage drop parameters, upper and lower limits of voltage rise time, pulse holding time, and fixed pulse free discharge time. The analysis process should be combined with the electrochemical characteristics of the battery, the differences in production batches, and the influence of environmental factors to ensure the scientificity and rationality of the adjustment direction. Finally, the test parameters can be adjusted according to the analysis results.

[0058] As a specific embodiment, Figure 3 is a schematic diagram of steps for determining short circuit test parameters according to an optional embodiment of the present invention, such as Figure 3 As shown, the short circuit test parameters can be determined by the following three steps:

[0059] Step 1: Set the short-circuit test voltage. The 7μm diaphragm can be used as the test object, and at least 25 sets of tests can be performed in each stage to obtain reliable statistical data. Figure 4 is a schematic diagram of the test results of the diaphragm breakdown voltage provided according to an optional embodiment of the present invention, wherein the incoming diaphragm breakdown voltage test is the original diaphragm breakdown voltage test, such as Figure 4 As shown, there are significant differences in the breakdown voltage of the diaphragm at different stages. The average breakdown voltage of the original diaphragm is 1440V, the average of the stacked / wound diaphragm is 600V, and the average of the diaphragm after baking drops to 500V. The initial short-circuit test voltage can be set according to 20% of the minimum average diaphragm breakdown voltage, that is, between 100V and 120V. Then 5 groups of battery tests were performed to obtain further test results. The test results show that a voltage of 120V will cause a larger breakdown point in the diaphragm, while a voltage of 100V will not cause the diaphragm to breakdown, so 100V was determined to be a reasonable short-circuit test voltage setting value.

[0060] Step 2: Set the short circuit test time. Figure 5 is a schematic diagram of a test result of a drop voltage parameter provided according to an optional embodiment of the present invention, such as Figure 5 As shown, the test time parameters include pulse holding time (TK) and fixed pulse free discharge time (TF). The voltage drop parameter (Vd1) in the voltage rise stage is independent of TK and TF time; the voltage drop parameter (Vd2) in the continuous charging stage remains stable after reaching 60ms; the voltage drop parameter (Vd3) in the free discharge stage changes linearly with the TF time. In accordance with the requirements of the short-circuit tester, the total test time must be more than 7 times the actual voltage rise time (TP). Given that TP is 17.2ms, the total test time is set to 300ms, which meets the equipment requirements. Therefore, TK is set to 60ms and TF is set to 210ms. Both values ​​are within a reasonable range and can effectively perform short-circuit tests without causing excessive impact on the battery. Among them, Figure 5 The horizontal axis is the test time in milliseconds, and the vertical axis is the voltage in volts.

[0061] Step 3: Set the drop voltage in the short circuit test parameters. Figure 6 is a schematic diagram of another test result of a drop voltage parameter provided according to an optional embodiment of the present invention, Figure 7 is a schematic diagram of qualified parameters of drop voltage parameters provided according to an optional embodiment of the present invention, such as Figure 6 and Figure 7 As shown, the drop voltage parameters (Vd1, Vd2, Vd3) are key indicators for determining whether the battery is short-circuited. Through big data analysis, when the pulse charging voltage and TP are within the normal range, the drop voltage parameters do not exceed the specifications, confirming that there is no over-killing phenomenon. For those drop voltages that are within the specification range but deviate from the normal value, it is found through K value tracking that they are within the specification limit, confirming the no-missing-killing characteristics of the test parameter setting. Based on this, Vd1, Vd2, and Vd3 are reasonably set to 3.5%, 9%, and 7.5%, respectively. Among them, Figure 6 The horizontal axis is the number of batteries tested, in units of pieces, and the vertical axis is the voltage, in units of volts.

[0062] By implementing the above method, all key parameters of lithium battery short circuit testing can be quickly and accurately determined, including voltage, pressure holding time, free discharge time and drop voltage threshold. This method not only ensures the effectiveness and reliability of the test, avoids the problem of scrapping in the early battery manufacturing process, but also provides a strong guarantee for battery safety. The application of this invention significantly improves the production quality and yield of batteries, and is an important progress in the field of battery production technology.

[0063] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0064] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method for determining the battery short circuit test parameters according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an 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, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0065] According to an embodiment of the present invention, there is also provided a device for determining a battery short-circuit test parameter for implementing the above-mentioned method for determining a battery short-circuit test parameter. Figure 8 is a structural block diagram of a device for determining battery short circuit test parameters according to an embodiment of the present invention, such as Figure 8 As shown, the device for determining battery short-circuit test parameters includes: a data acquisition module 81, an initial setting module 82, a short-circuit test module 83, a data verification module 84 and a parameter determination module 85. The device for determining battery short-circuit test parameters is described below.

[0066] The data acquisition module 81 is used to acquire the test data of the diaphragm breakdown voltage of the sample battery.

[0067] The initial setting module 82 is connected to the data acquisition module 81 and is used to preliminarily set initial short-circuit test parameters according to the test data of the diaphragm breakdown voltage.

[0068] The short-circuit test module 83 is connected to the initial setting module 82 and is used to perform a short-circuit test on the verification battery based on the initial short-circuit test parameters to obtain short-circuit test data of the verification battery.

[0069] The data verification module 84 is connected to the short-circuit test module 83 and is used to determine whether the short-circuit test data meets a predetermined verification condition, wherein the verification condition is used to verify the rationality of the short-circuit test parameters.

[0070] The parameter determination module 85 is connected to the data verification module 84 and is used to use the initial short-circuit test parameters as target short-circuit test parameters when the short-circuit test data meets a predetermined verification condition.

[0071] It should be noted that the above data acquisition module 81, initial setting module 82, short circuit test module 83, data verification module 84 and parameter determination module 85 correspond to steps S202 to S206 in the embodiment, and the examples and application scenarios implemented by the multiple modules and the corresponding steps are the same, but are not limited to the contents disclosed in the above embodiments. It should be noted that the above modules as part of the device can be run in the computer terminal 10 provided in the embodiment.

[0072] An embodiment of the present invention may provide a computer device. Optionally, in this embodiment, the computer device may be located in at least one network device among multiple network devices of a computer network. The computer device includes a memory and a processor.

[0073] Among them, the memory can be used to store software programs and modules, such as the program instructions / modules corresponding to the method and device for determining the battery short circuit test parameters in the embodiment of the present invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory, that is, the above-mentioned method for determining the battery short circuit test parameters is realized. The memory may include a high-speed random access memory, and may also include a 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 a memory remotely arranged relative to the processor, and these remote memories can be connected to the computer terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0074] The processor can call the information and application programs stored in the memory through the transmission device to perform the following steps: obtain the test data of the diaphragm breakdown voltage of the sample battery; preliminarily set the initial short-circuit test parameters according to the test data of the diaphragm breakdown voltage; based on the initial short-circuit test parameters, perform a short-circuit test on the verification battery to obtain the short-circuit test data of the verification battery; determine whether the short-circuit test data meets the predetermined verification conditions, wherein the verification conditions are used to verify the rationality of the short-circuit test parameters; when the short-circuit test data meets the predetermined verification conditions, use the initial short-circuit test parameters as the target short-circuit test parameters.

[0075] Optionally, the processor may also execute the program code of the following steps: based on the initial short-circuit test parameters, performing a short-circuit test on the verification battery to obtain short-circuit test data of the verification battery, including: based on the initial short-circuit test parameters, determining a pulse signal for performing a short-circuit test on the verification battery; applying the pulse signal to both ends of the verification battery, collecting voltage data of the verification battery, and obtaining short-circuit test data of the verification battery.

[0076] Optionally, the processor may also execute the program code of the following steps: the initial short circuit test parameters include at least one of the following: pulse charging voltage, pulse holding time, fixed pulse free discharge time, voltage drop parameter in the voltage rising stage, voltage drop parameter in the continuous charging stage, voltage drop parameter in the free discharge stage, lower limit value of voltage rise time, and upper limit value of voltage rise time.

[0077] Optionally, the processor may further execute program code of the following steps: the upper limit of the voltage rise time is greater than the sum of the pulse voltage holding time and the fixed pulse free discharge time.

[0078] Optionally, the processor may further execute program code of the following steps: an upper limit value of the voltage rise time is greater than 7 times of the actually measured voltage rise time, wherein the short circuit test data includes the actually measured voltage rise time.

[0079] Optionally, the processor may also execute the program code of the following steps: before obtaining the test data of the diaphragm breakdown voltage of the sample battery, the steps include: performing an original diaphragm breakdown voltage test, a stacked core diaphragm breakdown voltage test, and a baked diaphragm breakdown voltage test on the sample battery to obtain the test data of the original diaphragm breakdown voltage test, the test data of the stacked core diaphragm breakdown voltage test, and the test data of the baked diaphragm breakdown voltage test, wherein the test data of the diaphragm breakdown voltage include the test data of the original diaphragm breakdown voltage test, the test data of the stacked core diaphragm breakdown voltage test, and the test data of the baked diaphragm breakdown voltage test.

[0080] Optionally, the processor may also execute program code for the following steps: determining whether the short-circuit test data meets predetermined verification conditions, including: determining, in the verification batteries, batteries suspected of having short-circuit problems based on the short-circuit test data; disassembling and verifying the batteries suspected of having short-circuit problems to determine whether the batteries suspected of having short-circuit problems have short-circuit problems; and determining that the short-circuit test data meets the verification conditions when the proportion of batteries with short-circuit problems in the batteries suspected of having short-circuit problems is within a predetermined range.

[0081] Optionally, the processor may also execute the program code of the following steps: when the short-circuit test data does not meet predetermined verification conditions, the initial short-circuit test parameters are adjusted to obtain adjusted test parameters, and based on the adjusted test parameters, a short-circuit test is performed on the verification battery until the short-circuit test parameters corresponding to the short-circuit test data that meets the verification conditions are used as the target short-circuit test parameters.

[0082] By adopting the embodiment of the present invention, a scheme for determining the short-circuit test parameters of a battery is provided. By obtaining the test data of the diaphragm breakdown voltage of the sample battery; preliminarily setting the initial short-circuit test parameters according to the test data of the diaphragm breakdown voltage; based on the initial short-circuit test parameters, short-circuit test is performed on the verification battery to obtain the short-circuit test data of the verification battery; judging whether the short-circuit test data meets the predetermined verification conditions, wherein the verification conditions are used to verify the rationality of the short-circuit test parameters; when the short-circuit test data meets the predetermined verification conditions, the initial short-circuit test parameters are used as the target short-circuit test parameters, which can achieve the precise setting of the short-circuit test parameters, ensure the accuracy and reliability of the battery short-circuit test, effectively improve the production yield and safety performance of the battery, and also provide strong technical support for the fault analysis and performance improvement of the battery. This method is suitable for short-circuit testing of lithium batteries of different batches and types, and can meet the industry's high standards for battery production process control and quality assurance, laying a solid foundation for the widespread application and safe use of lithium batteries, thereby solving the technical problems of strong experience dependence and low reliability in the setting of battery short-circuit test parameters.

[0083] A person of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing the hardware related to the terminal device through a program, and the program can be stored in a non-volatile storage medium, and the storage medium may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0084] The embodiment of the present invention further provides a non-volatile storage medium. Optionally, in this embodiment, the non-volatile storage medium can be used to store the program code executed by the method for determining the battery short circuit test parameter provided in the above embodiment.

[0085] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a computer terminal group in a computer network, or in any mobile terminal in a mobile terminal group.

[0086] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: obtaining test data of the diaphragm breakdown voltage of a sample battery; preliminarily setting initial short-circuit test parameters based on the test data of the diaphragm breakdown voltage; performing a short-circuit test on a verification battery based on the initial short-circuit test parameters to obtain short-circuit test data of the verification battery; determining whether the short-circuit test data meets predetermined verification conditions, wherein the verification conditions are used to verify the rationality of the short-circuit test parameters; and when the short-circuit test data meets the predetermined verification conditions, using the initial short-circuit test parameters as target short-circuit test parameters.

[0087] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for executing the following steps: based on initial short-circuit test parameters, performing a short-circuit test on the verification battery to obtain short-circuit test data of the verification battery, including: based on the initial short-circuit test parameters, determining a pulse signal for performing a short-circuit test on the verification battery; applying the pulse signal to both ends of the verification battery, collecting voltage data of the verification battery, and obtaining short-circuit test data of the verification battery.

[0088] Optionally, in this embodiment, the non-volatile storage medium is configured to store program codes for performing the following steps: the initial short circuit test parameters include at least one of the following: pulse charging voltage, pulse holding time, fixed pulse free discharge time, voltage drop voltage parameter in the voltage rise phase, continuous charging phase drop voltage parameter, free discharge phase drop voltage parameter, lower limit value of voltage rise time, upper limit value of voltage rise time.

[0089] Optionally, in this embodiment, the non-volatile storage medium is configured to store program codes for executing the following steps: the upper limit value of the voltage rise time is greater than the sum of the pulse voltage holding time and the fixed pulse free discharge time.

[0090] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for executing the following steps: determining whether the short-circuit test data meets predetermined verification conditions, including: determining, among the verified batteries, batteries suspected of having short-circuit problems based on the short-circuit test data; disassembling and verifying the batteries suspected of having short-circuit problems to determine whether the batteries suspected of having short-circuit problems have short-circuit problems; and determining that the short-circuit test data meets the verification conditions when the proportion of batteries with short-circuit problems among the batteries suspected of having short-circuit problems is within a predetermined range.

[0091] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: when the short-circuit test data does not meet predetermined verification conditions, adjusting the initial short-circuit test parameters to obtain adjusted test parameters, and performing a short-circuit test on the verification battery based on the adjusted test parameters until the short-circuit test parameters corresponding to the short-circuit test data that meets the verification conditions are used as the target short-circuit test parameters.

[0092] An embodiment of the present invention further provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of the method for determining battery short-circuit test parameters in each embodiment of the present application.

[0093] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0094] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0095] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0096] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0097] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0098] If the integrated unit is implemented in the form of 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. The computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0099] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for determining battery short circuit test parameters, characterized in that: include: Obtaining test data of the separator breakdown voltage of the sample battery; Preliminarily setting initial short-circuit test parameters according to the test data of the diaphragm breakdown voltage; Based on the initial short-circuit test parameters, a short-circuit test is performed on the verification battery to obtain short-circuit test data of the verification battery; Determining whether the short-circuit test data meets a predetermined verification condition, wherein the verification condition is used to verify the rationality of the short-circuit test parameters; In a case where the short-circuit test data meets a predetermined verification condition, the initial short-circuit test parameter is used as a target short-circuit test parameter.

2. The method according to claim 1, characterized in that: The method of performing a short circuit test on a verification battery based on the initial short circuit test parameters to obtain short circuit test data of the verification battery includes: Based on the initial short-circuit test parameters, determining a pulse signal for performing a short-circuit test on the verification battery; The pulse signal is applied to both ends of the verification battery, and voltage data of the verification battery is collected to obtain short-circuit test data of the verification battery.

3. The method according to claim 2, characterized in that The initial short circuit test parameters include at least one of the following: pulse charging voltage, pulse voltage holding time, fixed pulse free discharge time, voltage drop parameter in the voltage rising stage, voltage drop parameter in the continuous charging stage, voltage drop parameter in the free discharge stage, lower limit value of voltage rise time, and upper limit value of voltage rise time.

4. The method according to claim 3, characterized in that The upper limit of the voltage rise time is greater than the sum of the pulse voltage holding time and the fixed pulse free discharge time.

5. The method according to claim 3, characterized in that: The upper limit value of the voltage rise time is greater than 7 times of the actually measured voltage rise time, wherein the short circuit test data includes the actually measured voltage rise time.

6. The method according to claim 1, characterized in that Before obtaining the test data of the breakdown voltage of the separator of the sample battery, the method includes: The sample battery is subjected to an original diaphragm breakdown voltage test, a stacked core diaphragm breakdown voltage test, and a baked diaphragm breakdown voltage test to obtain test data of the original diaphragm breakdown voltage test, the stacked core diaphragm breakdown voltage test, and the baked diaphragm breakdown voltage test, wherein the diaphragm breakdown voltage test data includes the test data of the original diaphragm breakdown voltage test, the stacked core diaphragm breakdown voltage test, and the baked diaphragm breakdown voltage test.

7. The method according to claim 1, characterized in that The determining whether the short-circuit test data meets a predetermined verification condition includes: According to the short-circuit test data, a battery suspected of having a short-circuit problem is determined in the verification battery; Disassembling and verifying the battery suspected of having a short-circuit problem to determine whether the battery suspected of having a short-circuit problem has a short-circuit problem; When the proportion of batteries with short-circuit problems among the batteries suspected of having short-circuit problems is within a predetermined range, it is determined that the short-circuit test data meets the verification condition.

8. The method according to any one of claims 1 to 7, characterized in that Also includes: When the short-circuit test data does not meet the predetermined verification conditions, the initial short-circuit test parameters are adjusted to obtain adjusted test parameters, and the verification battery is short-circuited and tested based on the adjusted test parameters until the short-circuit test parameters corresponding to the short-circuit test data that meets the verification conditions are used as the target short-circuit test parameters.

9. A device for determining battery short-circuit test parameters, characterized in that: include: A data acquisition module, used to acquire test data of the diaphragm breakdown voltage of the sample battery; An initial setting module, used to preliminarily set initial short-circuit test parameters according to the test data of the diaphragm breakdown voltage; A short circuit test module, used to perform a short circuit test on the verification battery based on an initial short circuit test parameter to obtain short circuit test data of the verification battery; A data verification module, used to determine whether the short-circuit test data meets a predetermined verification condition, wherein the verification condition is used to verify the rationality of the short-circuit test parameters; The parameter determination module is used to use the initial short-circuit test parameters as target short-circuit test parameters when the short-circuit test data meets the predetermined verification conditions.

10. A computer device, characterized in that: include: Memory and processor, The memory stores a computer program; The processor is used to execute the computer program stored in the memory, and when the computer program is running, the processor executes the method for determining the battery short-circuit test parameters according to any one of claims 1 to 8.

Images