Battery detection method and device, computer equipment, storage medium and program product

Abstract

The invention relates to a battery detection method and device, computer equipment, a storage medium and a program product. The method comprises the steps that in the process that a signal source emits an excitation signal, a line scanning displacement table is controlled to move, so that an electromagnetic ultrasonic transducer conducts line scanning on a to-be-detected battery based on an ultrasonic signal converted by the excitation signal; in the process that the electromagnetic ultrasonic transducer carries out line scanning on the to-be-detected battery, line scanning receiving signals of the to-be-detected battery at different positions in the length direction of the battery are obtained from the air coupling ultrasonic transducer; extracting an inner core signal of the battery to be detected from each line scanning receiving signal; and determining an electrolyte infiltration condition detection result and / or a sealing condition detection result of the to-be-detected battery according to the extracted envelope characteristic parameters of the inner core signal. By adopting the method, accurate detection of the battery can be realized.

Description

Technical Field

[0001] The present application relates to the technical field of battery detection, and in particular to a battery detection method, device, computer equipment, storage medium and program product. Background Art

[0002] The new energy vehicle industry is booming in my country, and its core is the production of power batteries. The quality of power batteries will directly affect the endurance of electric vehicles. An important process in the manufacturing of battery cells is to package and seal the battery, which includes two steps. The first step is to inject electrolyte into the cell structure after the positive electrode, negative electrode and diaphragm of the battery are assembled together to form a cell structure, that is, the electrolyte infiltration process, to ensure the performance and normal operation of the cell; the second step is to seal the cell after injecting the electrolyte to prevent electrolyte leakage and ensure the stability of the internal structure of the cell. After completing the above two steps, the battery can be tested as a finished product.

[0003] At present, the methods for detecting the electrolyte infiltration condition of batteries include X-ray irradiation, infrared thermal imaging, neutron imaging technology and non-contact air-coupled ultrasonic detection technology, but they all have problems such as radiation, high cost, low efficiency and low accuracy. The methods for detecting the sealing condition of batteries include airtightness detection and helium detection, which also have problems such as high cost and low accuracy.

[0004] Therefore, it is very important for battery manufacturing to achieve accurate detection of the electrolyte infiltration and sealing conditions of the battery. Summary of the invention

[0005] Based on this, it is necessary to provide a battery detection method, device, computer equipment, storage medium and program product to address the above technical problems, which can achieve accurate detection of batteries.

[0006] In a first aspect, the present application provides a battery detection method, the method comprising:

[0007] In the process of the signal source transmitting the excitation signal, the line scanning stage is controlled to move so that the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested based on the ultrasonic signal converted from the excitation signal;

[0008] When the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested, line scanning receiving signals of different positions of the battery to be tested in the length direction of the battery are obtained from the air-coupled ultrasonic transducer;

[0009] Extract the inner core signal of the battery to be tested from each line scan received signal;

[0010] According to the extracted envelope characteristic parameters of the inner core signal, the electrolyte infiltration condition detection result and / or the sealing condition detection result of the battery to be tested are determined.

[0011] In one embodiment, extracting the inner core signal of the battery to be tested from each line scan received signal includes:

[0012] De-noising is performed on each line scan received signal to obtain each valid signal; and based on the longitudinal wave velocity of each valid signal, the inner core signal of the battery to be tested is extracted from each valid signal.

[0013] In one embodiment, according to the longitudinal wave velocity of each effective signal, extracting the inner core signal of the battery to be tested from each effective signal includes:

[0014] According to the corresponding relationship between temperature and wave velocity, and the longitudinal wave velocity of each effective signal, each effective signal is compensated to obtain each compensation signal; according to the longitudinal wave velocity of each compensation signal, the inner core signal of the battery to be tested is extracted from each compensation signal.

[0015] In one embodiment, determining the electrolyte infiltration condition detection result of the battery to be tested according to the extracted envelope characteristic parameters of the inner core signal includes:

[0016] A first energy integral curve is constructed based on the signal energy integral of the extracted inner core signal; a first exponential curve is constructed based on the waveform index of the inner core signal; and a detection result of the electrolyte wetting condition of the battery to be tested is determined based on the volatility of the first energy integral curve and / or the volatility of the first exponential curve.

[0017] In one embodiment, determining the sealing condition detection result of the battery to be tested according to the extracted envelope characteristic parameters of the inner core signal includes:

[0018] A second energy integral curve is constructed based on the signal energy integral of the extracted inner core signal; a second exponential curve is constructed based on the waveform index of the raised inner core signal; a first time curve is constructed based on the flight time of the raised inner core signal; and a sealing condition detection result of the battery to be tested is determined based on at least one of the volatility of the second energy integral curve, the volatility of the second exponential curve and the volatility of the first time curve.

[0019] In one embodiment, the electromagnetic ultrasonic transducer is composed of a rectangular permanent magnet and a zigzag coil; or, the electromagnetic ultrasonic transducer is composed of a coil tightly wound around a rectangular permanent magnet.

[0020] In a second aspect, the present application also provides a battery detection device, the device comprising:

[0021] The scanning module is used to control the movement of the line scanning stage when the signal source transmits the excitation signal, so that the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested based on the ultrasonic signal converted by the excitation signal;

[0022] A signal receiving module is used to obtain line scanning receiving signals of the battery to be tested at different positions in the length direction of the battery from the air-coupled ultrasonic transducer during the process of the electromagnetic ultrasonic transducer performing line scanning on the battery to be tested;

[0023] A signal extraction module is used to extract the inner core signal of the battery to be tested from each line scanning received signal;

[0024] The result determination module is used to determine the electrolyte infiltration condition detection result and / or the sealing condition detection result of the battery to be tested according to the envelope characteristic parameters of the extracted inner core signal.

[0025] In a third aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0026] In the process of the signal source transmitting the excitation signal, the line scanning stage is controlled to move so that the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested based on the ultrasonic signal converted from the excitation signal;

[0027] When the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested, line scanning receiving signals of different positions of the battery to be tested in the length direction of the battery are obtained from the air-coupled ultrasonic transducer;

[0028] Extract the inner core signal of the battery to be tested from each line scan received signal;

[0029] According to the extracted envelope characteristic parameters of the inner core signal, the electrolyte infiltration condition detection result and / or the sealing condition detection result of the battery to be tested are determined.

[0030] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the following steps are implemented:

[0031] In the process of the signal source transmitting the excitation signal, the line scanning stage is controlled to move so that the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested based on the ultrasonic signal converted from the excitation signal;

[0032] When the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested, line scanning receiving signals of different positions of the battery to be tested in the length direction of the battery are obtained from the air-coupled ultrasonic transducer;

[0033] Extract the inner core signal of the battery to be tested from each line scan received signal;

[0034] According to the extracted envelope characteristic parameters of the inner core signal, the electrolyte infiltration condition detection result and / or the sealing condition detection result of the battery to be tested are determined.

[0035] In a fifth aspect, the present application further provides a computer program product, including a computer program, which implements the following steps when executed by a processor:

[0036] In the process of the signal source transmitting the excitation signal, the line scanning stage is controlled to move so that the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested based on the ultrasonic signal converted from the excitation signal;

[0037] When the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested, line scanning receiving signals of different positions of the battery to be tested in the length direction of the battery are obtained from the air-coupled ultrasonic transducer;

[0038] Extract the inner core signal of the battery to be tested from each line scan received signal;

[0039] According to the extracted envelope characteristic parameters of the inner core signal, the electrolyte infiltration condition detection result and / or the sealing condition detection result of the battery to be tested are determined.

[0040] The above-mentioned battery detection method, device, computer equipment, storage medium and program product, by controlling the movement of the line scanning displacement stage during the process of the signal source transmitting the excitation signal, so that the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested based on the ultrasonic signal converted by the excitation signal, and in the process of the electromagnetic ultrasonic transducer performing line scanning on the battery to be tested, the line scanning receiving signals of the battery to be tested at different positions in the length direction of the battery are obtained from the air-coupled ultrasonic transducer, so as to realize non-contact detection of the battery to be tested; further, the inner core signal of the battery to be tested is extracted from each line scanning receiving signal, so as to realize the extraction of the inner core signal that accurately reflects the internal state of the battery; and then, according to the envelope characteristic parameters of the extracted inner core signal, the electrolyte infiltration detection result and / or the sealing detection result of the battery to be tested are determined. This scheme not only realizes non-contact detection of the battery to be tested, but also eliminates the interference of electromagnetic induction and improves the conversion efficiency by introducing the electromagnetic ultrasonic transducer and the air-coupled ultrasonic transducer; further, by extracting the inner core signal and analyzing the inner core signal, the interference of irrelevant signals is eliminated, so as to realize accurate detection of the battery to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] FIG1 is a battery detection system diagram of a battery detection method provided in an embodiment of the present application;

[0043] FIG2 is a schematic diagram of a battery detection process provided in an embodiment of the present application;

[0044] FIG3 is a structural diagram of an electromagnetic ultrasonic transducer provided in an embodiment of the present application;

[0045] FIG4 is a structural diagram of another electromagnetic ultrasonic transducer provided in an embodiment of the present application;

[0046] FIG5 is a schematic diagram of a process for extracting an inner core signal provided in an embodiment of the present application;

[0047] FIG6 is a schematic diagram of another battery detection process provided in an embodiment of the present application;

[0048] FIG7 is a structural block diagram of a battery detection device provided in an embodiment of the present application;

[0049] FIG8 is a diagram of the internal structure of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0051] The battery detection method provided in the embodiment of the present application can be applied to the battery detection system shown in Figure 1. Wherein, the signal source includes a signal generator and a high-energy gated RF amplifier, and the host computer communicates with the signal source through a network. The data storage system can store the data that the host computer needs to process. The data storage system can be integrated on the host computer, or it can be placed on the cloud or other network servers. The host computer sends instructions to the signal source to control the signal source to emit an excitation signal, and sends instructions to the line scanning displacement stage to control the line scanning displacement stage to move with the battery to be tested, so as to obtain the line scanning receiving signals of the battery to be tested at different positions in the length direction of the battery from the air-coupled ultrasonic transducer, and analyze and process each line scanning receiving signal to obtain the electrolyte infiltration condition detection result and / or sealing condition detection result of the battery to be tested. Wherein, the host computer can be implemented with an independent server or a server cluster consisting of multiple servers.

[0052] In an exemplary embodiment, as shown in FIG2 , a battery detection method is provided, which is described by taking the method applied to the host computer in FIG1 as an example, and may include the following steps:

[0053] S201, when the signal source transmits an excitation signal, the line scanning stage is controlled to move so that the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested based on the ultrasonic signal converted from the excitation signal.

[0054] Among them, the signal source includes a signal generator and a high-energy gated RF amplifier; the electromagnetic ultrasonic transducer is composed of a rectangular permanent magnet and a zigzag coil, such as the zigzag coil is located directly below the rectangular permanent magnet, as shown in Figure 3; or, the electromagnetic ultrasonic transducer is composed of a coil tightly wound around a rectangular permanent magnet, as shown in Figure 4.

[0055] It should be noted that the battery to be tested is placed on the line scanning displacement stage in the battery detection system, the battery length direction of the battery to be tested is parallel to the moving direction of the line scanning displacement stage, the electromagnetic ultrasonic transducer and the air-coupled ultrasonic transducer in the battery detection system are symmetrically deployed on both sides of the battery thickness direction of the battery to be tested, and the signal source in the battery detection system is electrically connected to the electromagnetic ultrasonic transducer.

[0056] Exemplarily, the host computer controls the signal generator in the signal source to emit a sine wave signal and a square wave signal by sending a control instruction to the signal source, and inputs the sine wave signal and the square wave signal into a high-energy gated radio frequency amplifier to amplify it and obtain an excitation signal; wherein the signal amplification multiple can be controlled as needed; at the same time, while the signal source continues to emit the excitation signal, the line scanning displacement stage is controlled to move with the battery to be tested (for example, a conveyor belt is installed in the line scanning displacement stage, and the battery to be tested is placed on the conveyor belt in the line scanning displacement stage, and the uniform speed movement of the conveyor belt in the line scanning displacement stage is controlled to achieve uniform speed movement of the battery to be tested), so that the electromagnetic ultrasonic transducer that receives the excitation signal penetrates the main body of the battery to be tested with the signal converted into ultrasonic wave, i.e., line scanning.

[0057] Optionally, the excitation signal emitted by the signal source can be displayed by an oscilloscope for viewing by a technician.

[0058] S202, when the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested, obtaining line scanning receiving signals of the battery to be tested at different positions in the length direction of the battery from the air-coupled ultrasonic transducer.

[0059] The line scan receiving signal may represent a signal after the ultrasonic signal generated by the electromagnetic ultrasonic transducer passes through different positions of the battery to be tested in the length direction of the battery.

[0060] Exemplarily, in the process of the battery to be tested passing through the electromagnetic ultrasonic transducer and the air-coupled ultrasonic transducer, that is, in the process of the electromagnetic ultrasonic transducer performing line scanning on the battery to be tested, the ultrasonic signal generated by the electromagnetic ultrasonic transducer passes through different positions of the battery to be tested in the length direction of the battery; accordingly, after the ultrasonic signal penetrates different positions of the battery to be tested in the length direction of the battery, the air-coupled ultrasonic transducer can be used to receive the ultrasonic signal after penetrating the battery to be tested, that is, the line scanning receiving signal of the battery to be tested at different positions in the length direction of the battery, and the received line scanning receiving signal is sent to the host computer through the communication module, and the host computer analyzes it.

[0061] It should be noted that after the ultrasonic signal penetrates different positions of the battery to be tested in the length direction of the battery, the ultrasonic signal will weaken or change. Therefore, a high-voltage amplifier can be connected after the air-coupled ultrasonic transducer to achieve signal amplification.

[0062] Optionally, the line scan received signal can be displayed by an oscilloscope for viewing by a technician.

[0063] S203, extracting the inner core signal of the battery to be tested from each line scan received signal.

[0064] Among them, each line scan received signal includes a signal passing through the battery shell part to be tested and a signal passing through the inner core part of the battery to be tested; correspondingly, the inner core signal can represent the signal passing through the inner core part of the battery to be tested in each line scan received signal.

[0065] It should be noted that since the shell material of the battery to be tested is usually aluminum, and the longitudinal wave velocity of aluminum is about 6310m / s, the longitudinal wave velocity of the inner core of the battery to be tested is about 2000-3000m / s, that is, the longitudinal wave velocity of the inner core of the battery to be tested is much smaller than the shell wave velocity. Therefore, the signal passing through the shell part of the battery to be tested and the signal passing through the inner core part of the battery to be tested in each line scan received signal can be separated in the time domain.

[0066] Exemplarily, the wave velocity of each line scan received signal can be determined based on the envelope of each line scan received signal; further, each line scan received signal with a wave velocity in the range of 2000-3000m / s is extracted and determined as the inner core signal of the battery to be tested.

[0067] S204, determining the electrolyte infiltration condition detection result and / or the sealing condition detection result of the battery to be tested according to the extracted envelope characteristic parameters of the inner core signal.

[0068] Among them, the envelope characteristic parameters may include but are not limited to signal energy integral, flight time and waveform index, etc.; the electrolyte infiltration condition detection results may include but are not limited to the infiltration condition and the position to be inspected, such as the infiltration condition can be classified into complete infiltration, incomplete infiltration and no infiltration, and the classification standard can be divided according to the proportion of the infiltration volume; the sealing condition detection results may include but are not limited to the sealing condition and the position to be inspected, such as the sealing condition can be classified into good sealing and poor sealing, and the classification standard can be divided according to whether there is leakage or penetration.

[0069] Exemplarily, the envelope characteristic parameters of the inner core signal can be used to judge the volatility of the values ​​of each envelope characteristic parameter at different positions of the battery length direction of the battery to be tested, and the electrolyte infiltration condition detection result and / or the sealing condition detection result of the battery to be tested can be determined based on the volatility judgment result.

[0070] The above-mentioned battery detection method controls the movement of the line scanning displacement stage during the process of the signal source emitting the excitation signal, so that the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested based on the ultrasonic signal converted from the excitation signal, and in the process of the electromagnetic ultrasonic transducer performing line scanning on the battery to be tested, the line scanning receiving signals of the battery to be tested at different positions in the length direction of the battery are obtained from the air-coupled ultrasonic transducer, thereby realizing non-contact detection of the battery to be tested; further, the inner core signal of the battery to be tested is extracted from each line scanning receiving signal, thereby realizing the extraction of the inner core signal that accurately reflects the internal state of the battery; and then, according to the envelope characteristic parameters of the extracted inner core signal, the electrolyte infiltration detection result and / or the sealing detection result of the battery to be tested are determined. This scheme not only realizes non-contact detection of the battery to be tested, but also eliminates the interference of electromagnetic induction and improves the conversion efficiency by introducing electromagnetic ultrasonic transducers and air-coupled ultrasonic transducers; further, by extracting the inner core signal and analyzing the inner core signal, the interference of irrelevant signals is eliminated, thereby realizing accurate detection of the battery to be tested.

[0071] Based on the above embodiment, the present application embodiment explains the above embodiment S203 in detail. Specifically, the present application embodiment involves a process of extracting the inner core signal of the battery to be tested, as shown in FIG5 , which specifically includes the following steps:

[0072] S501, performing denoising processing on each line scan received signal to obtain each valid signal.

[0073] The effective signal may represent the effective signal after the line scan received signal is denoised.

[0074] For example, each line scan received signal can be processed based on the weak signal detection principle of the autocorrelation method. For example, the line scan received signal consists of a valid signal and noise, which can be written as ;in, is a valid signal, is noise; then the autocorrelation function of the line scan received signal can be expressed as: ; Further, it can be expressed as: ;in, is the autocorrelation function of the effective signal, is the autocorrelation function of the noise, is the autocorrelation function of the effective signal and noise, is the autocorrelation function of noise and effective signal, and N is the number of line scan received signals.

[0075] Since the effective signal is uncorrelated with the noise, , , autocorrelation function It also has a certain periodicity, that is, the line scan reception signal with noise interfering with the effective signal The autocorrelation function and the tiny effective signal The periods are equal.

[0076] Furthermore, we can look for peaks in the autocorrelation function. The peaks correspond to the periodicity or repeatability of the signal. We start from the highest point in the middle of the sequence and look to both sides at the same time until we find The two vertices of the minimum peak, that is, the difference between the subscripts that determine the two minimum vertices is cycle.

[0077] It should be noted that in order to ensure that the autocorrelation function When superimposed, the effective signal Working within the sequence range, you can use the integer method to calculate the number of superpositions, taking ; Furthermore, we can The signals are superimposed L times to cancel out noise and enhance the effective signal; finally, the superimposed signals can be extended to obtain the final effective signal.

[0078] S502, extracting the inner core signal of the battery to be tested from each valid signal according to the longitudinal wave velocity of each valid signal.

[0079] The longitudinal wave velocity can be calculated based on the time taken for the effective signal to penetrate the inner core of the battery to be tested and the thickness of the inner core of the battery to be tested.

[0080] A feasible method is to compensate each effective signal according to the corresponding relationship between temperature and wave velocity and the longitudinal wave velocity of each effective signal to obtain each compensation signal; and extract the inner core signal of the battery to be tested from each compensation signal according to the longitudinal wave velocity of each compensation signal.

[0081] It should be noted that changes in room temperature will affect the wave velocity, which in turn affects the transmission time of ultrasonic signals and the characteristics of received signals. Therefore, the effect of temperature changes on the wave velocity should be corrected. The wave velocity is related to the density and elastic modulus of the material, which will change with temperature. Therefore, the relationship curve between temperature and wave velocity can be obtained through Matlab fitting, that is, the corresponding relationship between temperature and wave velocity can be obtained.

[0082] Exemplarily, the delay or advance of each effective signal due to temperature change can be determined based on the corresponding relationship between temperature and wave velocity; further, each effective signal is compensated for the corresponding time shift and each compensation signal is obtained to eliminate the influence of temperature on the wave velocity; further, the inner core signal of the battery to be tested can be extracted from each compensation signal based on the obvious difference in longitudinal wave velocity between the battery shell to be tested and the inner core of the battery to be tested.

[0083] Another possible implementation method is to directly input each effective signal and the longitudinal wave velocity of each effective signal into the extraction model, and the extraction model analyzes and processes them to finally obtain the inner core signal of the battery to be tested.

[0084] In the embodiment of the present application, by introducing the longitudinal wave velocity, a basis is provided for distinguishing the signal passing through the shell portion of the battery to be tested and the signal passing through the inner core portion of the battery to be tested, thereby achieving accurate extraction of the inner core signal of the battery to be tested.

[0085] On the basis of the above-mentioned embodiments, the embodiments of the present application explain the above-mentioned embodiment S204 in detail. Specifically, in the scenario of detecting the electrolyte infiltration condition of the battery to be tested, the battery to be tested is a battery after liquid injection and exhaust, and the envelope characteristic parameters include signal energy integral and / or waveform index. Accordingly, according to the extracted envelope characteristic parameters of the inner core signal, the process of determining the electrolyte infiltration condition detection result of the battery to be tested specifically includes the following steps:

[0086] A first energy integral curve is constructed based on the signal energy integral of the extracted inner core signal; a first exponential curve is constructed based on the waveform index of the inner core signal; and a detection result of the electrolyte wetting condition of the battery to be tested is determined based on the volatility of the first energy integral curve and / or the volatility of the first exponential curve.

[0087] Among them, the signal energy integral can represent the total energy of the signal in the time domain or frequency domain; the waveform index can characterize the waveform characteristics of the signal and can be used to quantify parameters such as the shape and amplitude of the signal.

[0088] Exemplarily, a first energy integral curve between the battery position and the signal energy integral can be constructed based on the values ​​of the signal energy integral at different positions of the battery to be tested in the direction of the battery length, and a first exponential curve between the battery position and the waveform index can be constructed based on the values ​​of the waveform index at different positions of the battery to be tested in the direction of the battery length; further, the volatility of the first energy integral curve and the first exponential curve can be judged respectively according to a preset fluctuation threshold, and the electrolyte infiltration condition detection result of the battery to be tested can be determined according to the fluctuation judgment result.

[0089] In the embodiment of the present application, by introducing signal energy integration and waveform index, a standard is provided for accurately judging the electrolyte infiltration condition of the battery to be tested.

[0090] Based on the above-mentioned embodiments, the embodiments of the present application explain the above-mentioned embodiment S204 in detail. Specifically, in the scenario of detecting the sealing condition of the battery to be tested, the battery to be tested is a battery after vacuum treatment, and the envelope characteristic parameters include at least one of the signal energy integral, the flight time and the waveform index. Accordingly, according to the extracted envelope characteristic parameters of the inner core signal, the process of determining the sealing condition detection result of the battery to be tested specifically includes the following steps:

[0091] A second energy integral curve is constructed based on the signal energy integral of the extracted inner core signal; a second exponential curve is constructed based on the waveform index of the raised inner core signal; a first time curve is constructed based on the flight time of the raised inner core signal; and a sealing condition detection result of the battery to be tested is determined based on at least one of the volatility of the second energy integral curve, the volatility of the second exponential curve and the volatility of the first time curve.

[0092] The flight time may represent the residence time of the signal inside the battery to be tested, that is, the time taken for the signal to penetrate the battery to be tested.

[0093] Exemplarily, a second energy integral curve between the battery position and the signal energy integral can be constructed based on the values ​​of the signal energy integral at different positions of the battery to be tested in the direction of the battery length, a second exponential curve between the battery position and the waveform index can be constructed based on the values ​​of the waveform index at different positions of the battery to be tested in the direction of the battery length, and a first time curve between the battery position and the flight time can be constructed based on the values ​​of the flight time at different positions of the battery to be tested in the direction of the battery length; further, the volatility of the first energy integral curve, the first exponential curve and the first time curve can be judged respectively according to a preset fluctuation threshold, and the sealing condition detection result of the battery to be tested can be determined based on the fluctuation judgment result.

[0094] In the embodiments of the present application, by introducing signal energy integration, waveform index and flight time, a standard is provided for accurately judging the sealing condition of the battery to be tested.

[0095] Based on the above embodiment, this embodiment provides an optional example of a battery detection method. As shown in FIG6 , the specific implementation process is as follows:

[0096] S601, when the signal source transmits an excitation signal, the line scanning stage is controlled to move so that the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested based on the ultrasonic signal converted from the excitation signal.

[0097] The electromagnetic ultrasonic transducer is composed of a rectangular permanent magnet and a zigzag coil; or, the electromagnetic ultrasonic transducer is composed of a coil tightly wound around a rectangular permanent magnet.

[0098] S602, when the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested, obtaining line scanning receiving signals of the battery to be tested at different positions in the length direction of the battery from the air-coupled ultrasonic transducer.

[0099] S603, performing denoising processing on each line scan received signal to obtain each valid signal.

[0100] S604, performing compensation processing on each effective signal according to the corresponding relationship between temperature and wave velocity and the longitudinal wave velocity of each effective signal to obtain each compensated signal.

[0101] S605 , extracting the inner core signal of the battery to be tested from each compensation signal according to the longitudinal wave velocity of each compensation signal.

[0102] S606, determining the electrolyte infiltration condition detection result and / or the sealing condition detection result of the battery to be tested according to the extracted envelope characteristic parameters of the inner core signal.

[0103] In a feasible manner, in a scenario where the electrolyte infiltration condition of a battery to be tested is detected, the battery to be tested is a battery after liquid injection and exhaust, and the envelope characteristic parameters include signal energy integral and / or waveform index. According to the extracted envelope characteristic parameters of the inner core signal, the electrolyte infiltration condition detection result of the battery to be tested is determined, including:

[0104] A first energy integral curve is constructed based on the signal energy integral of the extracted inner core signal; a first exponential curve is constructed based on the waveform index of the inner core signal; and a detection result of the electrolyte wetting condition of the battery to be tested is determined based on the volatility of the first energy integral curve and / or the volatility of the first exponential curve.

[0105] Another achievable method is to detect the sealing condition of the battery to be tested, where the battery to be tested is a battery that has been vacuumed, and the envelope characteristic parameters include at least one of the signal energy integral, the flight time, and the waveform index. The sealing condition detection result of the battery to be tested is determined according to the extracted envelope characteristic parameters of the inner core signal, including:

[0106] A second energy integral curve is constructed based on the signal energy integral of the extracted inner core signal; a second exponential curve is constructed based on the waveform index of the raised inner core signal; a first time curve is constructed based on the flight time of the raised inner core signal; and a sealing condition detection result of the battery to be tested is determined based on at least one of the volatility of the second energy integral curve, the volatility of the second exponential curve and the volatility of the first time curve.

[0107] The specific process of the above S601-S606 can refer to the description of the above method embodiment, and its implementation principle and technical effect are similar, which will not be repeated here.

[0108] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0109] Based on the same inventive concept, the embodiment of the present application also provides a battery detection device for implementing the battery detection method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more battery detection device embodiments provided below can refer to the limitations of the battery detection method above, and will not be repeated here.

[0110] In an exemplary embodiment, as shown in FIG. 7 , a battery detection device 1 is provided, comprising: a scanning module 10 , a signal receiving module 20 , a signal extraction module 30 and a result determination module 40 , wherein:

[0111] The scanning module 10 is used to control the movement of the line scanning stage when the signal source transmits the excitation signal, so that the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested based on the ultrasonic signal converted from the excitation signal.

[0112] The signal receiving module 20 is used to obtain line scanning receiving signals of the battery to be tested at different positions in the length direction of the battery from the air-coupled ultrasonic transducer during the process of the electromagnetic ultrasonic transducer performing line scanning on the battery to be tested.

[0113] The signal extraction module 30 is used to extract the inner core signal of the battery to be tested from each line scan received signal.

[0114] The result determination module 40 is used to determine the electrolyte infiltration condition detection result and / or the sealing condition detection result of the battery to be tested according to the envelope characteristic parameters of the extracted inner core signal.

[0115] In one embodiment, the signal extraction module 30 is specifically used for:

[0116] De-noising is performed on each line scan received signal to obtain each valid signal; and based on the longitudinal wave velocity of each valid signal, the inner core signal of the battery to be tested is extracted from each valid signal.

[0117] In one embodiment, the signal extraction module 30 is further configured to:

[0118] According to the corresponding relationship between temperature and wave velocity, and the longitudinal wave velocity of each effective signal, each effective signal is compensated to obtain each compensation signal; according to the longitudinal wave velocity of each compensation signal, the inner core signal of the battery to be tested is extracted from each compensation signal.

[0119] In one embodiment, the result determination module 40 is specifically used to:

[0120] A first energy integral curve is constructed based on the signal energy integral of the extracted inner core signal; a first exponential curve is constructed based on the waveform index of the inner core signal; and a detection result of the electrolyte wetting condition of the battery to be tested is determined based on the volatility of the first energy integral curve and / or the volatility of the first exponential curve.

[0121] In one embodiment, the result determination module 40 is specifically used to:

[0122] A second energy integral curve is constructed based on the signal energy integral of the extracted inner core signal; a second exponential curve is constructed based on the waveform index of the raised inner core signal; a first time curve is constructed based on the flight time of the raised inner core signal; and a sealing condition detection result of the battery to be tested is determined based on at least one of the volatility of the second energy integral curve, the volatility of the second exponential curve and the volatility of the first time curve.

[0123] In one embodiment, the electromagnetic ultrasonic transducer is composed of a rectangular permanent magnet and a zigzag coil; or, the electromagnetic ultrasonic transducer is composed of a coil tightly wound around a rectangular permanent magnet.

[0124] Each module in the above battery detection device can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each module.

[0125] In an exemplary embodiment, a computer device is provided, which may be a host computer, and its internal structure diagram may be shown in FIG8. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. The processor, the memory, and the input / output interface are connected via a system bus, and the communication interface, the display unit, and the input device are connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a battery detection method is implemented. The display unit of the computer device is used to form a visually visible picture, which may be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0126] Those skilled in the art will understand that the structure shown in FIG. 8 is merely a block diagram of a partial structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0127] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0128] In the process of the signal source transmitting the excitation signal, the line scanning stage is controlled to move so that the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested based on the ultrasonic signal converted from the excitation signal;

[0129] When the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested, line scanning receiving signals of different positions of the battery to be tested in the length direction of the battery are obtained from the air-coupled ultrasonic transducer;

[0130] Extract the inner core signal of the battery to be tested from each line scan received signal;

[0131] According to the extracted envelope characteristic parameters of the inner core signal, the electrolyte infiltration condition detection result and / or the sealing condition detection result of the battery to be tested are determined.

[0132] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0133] De-noising is performed on each line scan received signal to obtain each valid signal; and based on the longitudinal wave velocity of each valid signal, the inner core signal of the battery to be tested is extracted from each valid signal.

[0134] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0135] According to the corresponding relationship between temperature and wave velocity, and the longitudinal wave velocity of each effective signal, each effective signal is compensated to obtain each compensation signal; according to the longitudinal wave velocity of each compensation signal, the inner core signal of the battery to be tested is extracted from each compensation signal.

[0136] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0137] A first energy integral curve is constructed based on the signal energy integral of the extracted inner core signal; a first exponential curve is constructed based on the waveform index of the inner core signal; and a detection result of the electrolyte wetting condition of the battery to be tested is determined based on the volatility of the first energy integral curve and / or the volatility of the first exponential curve.

[0138] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0139] A second energy integral curve is constructed based on the signal energy integral of the extracted inner core signal; a second exponential curve is constructed based on the waveform index of the raised inner core signal; a first time curve is constructed based on the flight time of the raised inner core signal; and a sealing condition detection result of the battery to be tested is determined based on at least one of the volatility of the second energy integral curve, the volatility of the second exponential curve and the volatility of the first time curve.

[0140] In one embodiment, the electromagnetic ultrasonic transducer is composed of a rectangular permanent magnet and a zigzag coil; or, the electromagnetic ultrasonic transducer is composed of a coil tightly wound around a rectangular permanent magnet.

[0141] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0142] In the process of the signal source transmitting the excitation signal, the line scanning stage is controlled to move so that the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested based on the ultrasonic signal converted from the excitation signal;

[0143] When the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested, line scanning receiving signals of different positions of the battery to be tested in the length direction of the battery are obtained from the air-coupled ultrasonic transducer;

[0144] Extract the inner core signal of the battery to be tested from each line scan received signal;

[0145] According to the extracted envelope characteristic parameters of the inner core signal, the electrolyte infiltration condition detection result and / or the sealing condition detection result of the battery to be tested are determined.

[0146] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0147] De-noising is performed on each line scan received signal to obtain each valid signal; and based on the longitudinal wave velocity of each valid signal, the inner core signal of the battery to be tested is extracted from each valid signal.

[0148] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0149] According to the corresponding relationship between temperature and wave velocity, and the longitudinal wave velocity of each effective signal, each effective signal is compensated to obtain each compensation signal; according to the longitudinal wave velocity of each compensation signal, the inner core signal of the battery to be tested is extracted from each compensation signal.

[0150] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0151] A first energy integral curve is constructed based on the signal energy integral of the extracted inner core signal; a first exponential curve is constructed based on the waveform index of the inner core signal; and a detection result of the electrolyte wetting condition of the battery to be tested is determined based on the volatility of the first energy integral curve and / or the volatility of the first exponential curve.

[0152] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0153] A second energy integral curve is constructed based on the signal energy integral of the extracted inner core signal; a second exponential curve is constructed based on the waveform index of the raised inner core signal; a first time curve is constructed based on the flight time of the raised inner core signal; and a sealing condition detection result of the battery to be tested is determined based on at least one of the volatility of the second energy integral curve, the volatility of the second exponential curve and the volatility of the first time curve.

[0154] In one embodiment, the electromagnetic ultrasonic transducer is composed of a rectangular permanent magnet and a zigzag coil; or, the electromagnetic ultrasonic transducer is composed of a coil tightly wound around a rectangular permanent magnet.

[0155] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0156] In the process of the signal source transmitting the excitation signal, the line scanning stage is controlled to move so that the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested based on the ultrasonic signal converted from the excitation signal;

[0157] When the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested, line scanning receiving signals of different positions of the battery to be tested in the length direction of the battery are obtained from the air-coupled ultrasonic transducer;

[0158] Extract the inner core signal of the battery to be tested from each line scan received signal;

[0159] According to the extracted envelope characteristic parameters of the inner core signal, the electrolyte infiltration condition detection result and / or the sealing condition detection result of the battery to be tested are determined.

[0160] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0161] De-noising is performed on each line scan received signal to obtain each valid signal; and based on the longitudinal wave velocity of each valid signal, the inner core signal of the battery to be tested is extracted from each valid signal.

[0162] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0163] According to the corresponding relationship between temperature and wave velocity, and the longitudinal wave velocity of each effective signal, each effective signal is compensated to obtain each compensation signal; according to the longitudinal wave velocity of each compensation signal, the inner core signal of the battery to be tested is extracted from each compensation signal.

[0164] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0165] A first energy integral curve is constructed based on the signal energy integral of the extracted inner core signal; a first exponential curve is constructed based on the waveform index of the inner core signal; and a detection result of the electrolyte wetting condition of the battery to be tested is determined based on the volatility of the first energy integral curve and / or the volatility of the first exponential curve.

[0166] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0167] A second energy integral curve is constructed based on the signal energy integral of the extracted inner core signal; a second exponential curve is constructed based on the waveform index of the raised inner core signal; a first time curve is constructed based on the flight time of the raised inner core signal; and a sealing condition detection result of the battery to be tested is determined based on at least one of the volatility of the second energy integral curve, the volatility of the second exponential curve and the volatility of the first time curve.

[0168] In one embodiment, the electromagnetic ultrasonic transducer is composed of a rectangular permanent magnet and a zigzag coil; or, the electromagnetic ultrasonic transducer is composed of a coil tightly wound around a rectangular permanent magnet.

[0169] It should be noted that the information (including but not limited to battery information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0170] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0171] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0172] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the present application. It should be noted that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A battery detection method, characterized in that: The host computer is applied to a battery detection system, the battery to be tested is placed on a line scanning displacement stage in the battery detection system, the battery length direction of the battery to be tested is parallel to the moving direction of the line scanning displacement stage, the electromagnetic ultrasonic transducer and the air-coupled ultrasonic transducer in the battery detection system are symmetrically arranged on both sides of the battery thickness direction of the battery to be tested, and the signal source in the battery detection system is electrically connected to the electromagnetic ultrasonic transducer. The method comprises: In the process of the signal source transmitting the excitation signal, controlling the line scanning stage to move so that the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested based on the ultrasonic signal converted from the excitation signal; In the process of the electromagnetic ultrasonic transducer performing line scanning on the battery to be tested, obtaining line scanning receiving signals of the battery to be tested at different positions in the length direction of the battery from the air-coupled ultrasonic transducer; Extracting the inner core signal of the battery to be tested from each line scan received signal; The electrolyte infiltration condition detection result and / or the sealing condition detection result of the battery to be tested are determined according to the envelope characteristic parameters of the extracted inner core signal.

2. The method according to claim 1, characterized in that The step of extracting the inner core signal of the battery to be tested from each line scan received signal comprises: De-noising each line scan received signal to obtain each valid signal; According to the longitudinal wave velocity of each effective signal, the inner core signal of the battery to be tested is extracted from each effective signal.

3. The method according to claim 2, characterized in that The step of extracting the inner core signal of the battery to be tested from each effective signal according to the longitudinal wave velocity of each effective signal comprises: According to the corresponding relationship between temperature and wave velocity, and the longitudinal wave velocity of each effective signal, each effective signal is compensated to obtain each compensation signal; According to the longitudinal wave velocity of each compensation signal, the inner core signal of the battery to be tested is extracted from each compensation signal.

4. The method according to claim 1, characterized in that: In the scenario of detecting the electrolyte infiltration condition of the battery to be tested, the battery to be tested is a battery after liquid injection and exhaust, the envelope characteristic parameters include signal energy integral and / or waveform index, and the electrolyte infiltration condition detection result of the battery to be tested is determined according to the extracted envelope characteristic parameters of the inner core signal, including: Constructing a first energy integration curve according to the signal energy integration of the extracted inner core signal; Constructing a first exponential curve according to the waveform index of the inner core signal mentioned; The electrolyte infiltration condition detection result of the battery to be tested is determined according to the volatility of the first energy integral curve and / or the volatility of the first exponential curve.

5. The method according to claim 1, characterized in that In the scenario of detecting the sealing condition of the battery to be tested, the battery to be tested is a battery after vacuum treatment, and the envelope characteristic parameters include at least one of signal energy integral, flight time and waveform index. According to the extracted envelope characteristic parameters of the inner core signal, the sealing condition detection result of the battery to be tested is determined, including: Constructing a second energy integration curve according to the signal energy integration of the extracted inner core signal; Constructing a second exponential curve according to the waveform index of the inner core signal mentioned; Constructing a first time curve according to the flight time of the mentioned inner core signal; The sealing condition detection result of the battery to be tested is determined according to at least one of the volatility of the second energy integral curve, the volatility of the second exponential curve and the volatility of the first time curve.

6. The method according to claim 1, characterized in that The electromagnetic ultrasonic transducer is composed of a rectangular permanent magnet and a zigzag coil; or, the electromagnetic ultrasonic transducer is composed of a coil tightly wound around a rectangular permanent magnet.

7. A battery detection device, characterized in that: In a host computer configured in a battery detection system, a battery to be tested is placed on a line scanning displacement stage in the battery detection system, a battery length direction of the battery to be tested is parallel to a moving direction of the line scanning displacement stage, an electromagnetic ultrasonic transducer and an air-coupled ultrasonic transducer in the battery detection system are symmetrically arranged on both sides of a battery thickness direction of the battery to be tested, a signal source in the battery detection system is electrically connected to the electromagnetic ultrasonic transducer, and the device comprises: A scanning module, used for controlling the movement of the line scanning stage during the process of the signal source transmitting the excitation signal, so that the electromagnetic ultrasonic transducer performs line scanning on the battery to be tested based on the ultrasonic signal converted from the excitation signal; A signal receiving module, used for acquiring line scanning receiving signals of the battery to be tested at different positions in the length direction of the battery from the air-coupled ultrasonic transducer during the process of the electromagnetic ultrasonic transducer performing line scanning on the battery to be tested; A signal extraction module, used to extract the inner core signal of the battery to be tested from each line scan received signal; The result determination module is used to determine the electrolyte infiltration condition detection result and / or the sealing condition detection result of the battery to be tested according to the envelope characteristic parameters of the extracted inner core signal.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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