Battery cell detection method and device

Abstract

The invention provides a battery cell detection method and device. The method comprises the following steps: emitting multiple low-frequency ultrasonic signals for a target detection point of a battery cell; receiving a plurality of ultrasonic detection signals corresponding to the multiple low-frequency ultrasonic signals; and outputting a detection result of the battery cell based on the plurality of ultrasonic detection signals. As the low-frequency ultrasonic signals are transmitted for multiple times for the target detection point of the battery cell, the low-frequency ultrasonic signals can effectively penetrate through the semi-solid battery cell, and the signal contrast of the ultrasonic detection signals can be effectively improved on the basis of improving the penetrating power of the ultrasonic signals by transmitting the low-frequency ultrasonic signals for multiple times for the same detection point; and thus, an effective ultrasonic detection image is obtained.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery cell manufacturing, and in particular relates to a battery cell detection method and device. Background Art

[0002] In order to improve the safety of batteries, semi-solid cell technology is widely used. It solidifies the liquid electrolyte in the battery to make it solid or nearly solid, so as to reduce the content of liquid electrolyte, avoid the liquid electrolyte from volatilizing and leaking easily in high temperature environment, and may instantly vaporize and increase in volume in high temperature and high pressure environment, causing explosion, which will affect the life and stability of the battery. Among them, the gelation of electrolyte, diaphragm, etc. is a common means to achieve semi-solid cells. In the semi-solid cell manufacturing technology, the uniformity of curing inside the cell will significantly affect the safety and electrical performance of the cell. In order to verify the uniformity of cell curing and its impact on cell performance, non-destructive testing of semi-solid cells is required.

[0003] Ultrasonic coupling characterization technology can be used for non-destructive inspection of the electrolyte wettability and the welding status of the tabs inside the battery cell. However, when using the existing ultrasonic detection method to detect the internal status of the semi-solid battery cell, it has the following shortcomings: the ultrasonic signal cannot effectively penetrate the semi-solid battery cell, and thus it is impossible to obtain an effective ultrasonic detection image of the battery cell. Therefore, how to use non-destructive testing methods to effectively detect semi-solid batteries is a problem that needs to be solved urgently. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a battery cell detection method and device to solve the problem that ultrasonic signals cannot effectively penetrate semi-solid battery cells during the semi-solid battery cell detection process, and thus cannot obtain effective battery cell ultrasonic detection images.

[0005] In order to solve or improve the above technical problems to a certain extent, according to one aspect of the present invention, a cell detection method is provided, the method comprising:

[0006] transmitting multiple low-frequency ultrasonic signals at target detection points of the battery cell;

[0007] Receiving a plurality of ultrasonic detection signals corresponding to the plurality of low-frequency ultrasonic signals;

[0008] The detection result of the battery cell is output based on the plurality of ultrasonic detection signals.

[0009] In some embodiments, transmitting a plurality of low-frequency ultrasonic signals to a target detection point of the battery cell includes: transmitting a plurality of low-frequency ultrasonic signals to a target detection point of the battery cell in a high-resolution signal transmission manner.

[0010] In some embodiments, the plurality of ultrasonic detection signals include a plurality of ultrasonic transmission signals, and outputting the detection result of the battery cell based on the plurality of ultrasonic detection signals includes:

[0011] An average value or a sum value of the signal strengths of the multiple transmitted ultrasonic signals is determined as the transmitted ultrasonic signal strength information corresponding to the target detection point, and a detection result of the battery cell is output based on the transmitted ultrasonic signal strength information.

[0012] In some embodiments, the multiple ultrasonic detection signals include multiple ultrasonic reflection signals, and outputting the detection results of the battery cell based on the multiple ultrasonic detection signals includes: determining the mean or sum of the signal strengths of the multiple reflected ultrasonic signals as the reflected ultrasonic signal strength information corresponding to the target detection point; and outputting the detection results of the battery cell based on the reflected ultrasonic signal strength information.

[0013] In some embodiments, it further comprises:

[0014] Pre-obtaining a first corresponding relationship between the distribution of the internal polymer of the battery core sample and the intensity of the transmitted ultrasonic signal;

[0015] The detection result of the battery cell output based on the transmitted ultrasonic signal intensity information is compared with the first corresponding relationship to obtain a target distribution status of the internal polymer of the battery cell.

[0016] In some embodiments, it further comprises:

[0017] Pre-obtaining a second corresponding relationship between the distribution of the internal polymer of the battery sample and the intensity of the reflected ultrasonic signal of the semi-solid battery;

[0018] The detection result of the battery cell output based on the reflected ultrasonic signal intensity information is compared with the second corresponding relationship to obtain a target distribution status of the internal polymer of the battery cell.

[0019] In some embodiments, the receiving a plurality of ultrasonic detection signals corresponding to the plurality of low-frequency ultrasonic signals comprises:

[0020] In response to the coupling medium being air, receiving a plurality of transmitted ultrasonic signals corresponding to the plurality of low-frequency ultrasonic signals; or,

[0021] In response to the coupling medium being silicone oil, a plurality of reflected ultrasonic signals corresponding to the plurality of low-frequency ultrasonic signals are received.

[0022] In some embodiments, the target inspection points are multiple inspection points located in the middle area or the edge sealing area of ​​the battery cell.

[0023] In some embodiments, the battery cell is a semi-solid battery cell.

[0024] According to another aspect of the present invention, there is provided a battery cell detection device, the device comprising:

[0025] A low-frequency ultrasonic signal transmitting unit, used to control the ultrasonic signal transmitting end to transmit multiple low-frequency ultrasonic signals to the target detection point of the battery cell;

[0026] An ultrasonic signal receiving unit, used for controlling an ultrasonic signal receiving end to receive a plurality of ultrasonic detection signals corresponding to the plurality of low-frequency ultrasonic signals;

[0027] A detection unit is used to output a detection result of the battery cell based on the multiple ultrasonic detection signals.

[0028] According to another aspect of the present invention, there is provided an electronic device, comprising a processor and a memory; wherein the memory is used to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement the battery cell detection method described in any one of the above embodiments.

[0029] According to another aspect of the present invention, there is provided a computer-readable storage medium having one or more computer instructions stored thereon, wherein the instructions are executed by a processor to implement the battery cell detection method described in any one of the above embodiments.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] The battery cell detection method provided by the present invention transmits multiple low-frequency ultrasonic signals to the target detection point of the battery cell; receives multiple ultrasonic detection signals corresponding to the multiple low-frequency ultrasonic signals; and detects the battery cell based on the multiple ultrasonic detection signals. Taking a semi-solid battery cell as an example, since the present invention transmits multiple low-frequency ultrasonic signals to the target detection point of the semi-solid battery cell, the low-frequency ultrasonic signal can effectively penetrate the semi-solid battery cell, and multiple low-frequency ultrasonic signals are emitted to the same detection point, which can effectively improve the signal contrast of the ultrasonic detection signal on the basis of improving the penetration of the ultrasonic signal, thereby obtaining an effective ultrasonic detection image.

[0032] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a flow chart of a battery cell detection method provided in an embodiment of the present application;

[0034] Figure 2is a schematic diagram of a transmission ultrasound detection image of a liquid battery core provided in an embodiment of the present application;

[0035] Figure 3 is a schematic diagram of a transmission ultrasound detection image of a semi-solid battery cell provided in an embodiment of the present application;

[0036] Figure 4 It is a schematic diagram of low-frequency transmission ultrasonic testing of a semi-solid soft-pack battery cell provided in an embodiment of the present application;

[0037] Figure 5 is a schematic diagram of an ultrasonic detection image of a semi-solid battery cell with improved resolution provided in an embodiment of the present application;

[0038] Figure 6 is a schematic diagram of the distribution of different polymers inside a semi-solid battery cell provided in an embodiment of the present application;

[0039] Figure 7 It is a schematic diagram comparing an image of a semi-solid battery cell provided in an embodiment of the present application after accelerated cycling and fully charged and disassembled, and an image of ultrasonic detection;

[0040] Figure 8 is a schematic diagram of an ultrasonic detection image of an edge sealing area of ​​a semi-solid battery cell provided in an embodiment of the present application;

[0041] Fig. 9 is a unit block diagram of a battery cell detection device provided in an embodiment of the present application;

[0042] Fig.10 It is a schematic diagram of the logical structure of the electronic device provided in the embodiment of the present application. DETAILED DESCRIPTION

[0043] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation method and effects of the user identity authentication method proposed in the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0044] Many specific details are described in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present application, so the present application is not limited by the specific implementation disclosed below.

[0045] When using the existing ultrasonic detection method (high-frequency probe frequency) to detect the internal state of a semi-solid battery cell, the following shortcomings exist: the ultrasonic signal cannot effectively penetrate the semi-solid battery cell, and thus an effective ultrasonic detection image of the battery cell cannot be obtained. If a low-frequency ultrasonic signal is used, the signal contrast is poor, and an effective ultrasonic detection image of the battery cell cannot be obtained.

[0046] In view of the above-mentioned detection scenario of semi-solid battery cells, in order to obtain effective battery cell ultrasonic detection images during the detection process of semi-solid battery cells, the present application provides a battery cell detection method, a battery cell detection device, an electronic device and a computer-readable storage medium corresponding to the method. The following provides embodiments to describe the above-mentioned method, device, electronic device and computer-readable storage medium in detail.

[0047] An embodiment of the present application provides a battery cell detection method, the application subject of the method may be a computing device application for controlling an ultrasonic detection process of a semi-solid battery cell, and the computing device application may be run on a battery cell detection device. Figure 1 This is a flow chart of a battery cell detection method provided in an embodiment of the present application. Figure 1 The method provided in this embodiment is described in detail. The embodiments described below are used to explain the principle of the method and are not intended to be limiting for actual use.

[0048] like Figure 1 As shown, the battery cell detection method provided in this embodiment includes the following steps:

[0049] S101, multiple low-frequency ultrasonic signals are emitted for the target detection point of the battery cell, that is, the low-frequency ultrasonic signal is repeatedly emitted for the same target detection point of the target semi-solid battery cell. The low-frequency ultrasonic signal is relative to the existing medium- and high-frequency ultrasonic signals. Specifically, the emission frequency of the low-frequency ultrasonic signal in this embodiment can be 100Hz-200Hz, while the emission frequency of the existing medium- and high-frequency ultrasonic signals is 400Hz and above.

[0050] S102, receiving a plurality of ultrasonic detection signals corresponding to the plurality of low-frequency ultrasonic signals, specifically, receiving a plurality of transmitted ultrasonic signals corresponding to the plurality of low-frequency ultrasonic signals, or receiving a plurality of reflected ultrasonic signals corresponding to the plurality of low-frequency ultrasonic signals.

[0051] S103, outputting the detection result of the battery cell based on the above-mentioned multiple ultrasonic detection signals, specifically, detecting the target semi-solid battery cell based on the above-mentioned multiple transmitted ultrasonic signals, or detecting the target semi-solid battery cell based on the above-mentioned multiple reflected ultrasonic signals, and outputting the detection result of the target semi-solid battery cell.

[0052] Since the propagation speed of ultrasound is closely related to the bulk modulus, shear modulus and density of the object being measured, the ultrasonic signal can be associated with the internal state of the object being measured through the difference in ultrasonic waveform, flight time, signal strength, etc. Ultrasonic testing is a testing technology that uses the interaction between ultrasound and the object being measured to analyze the transmitted and reflected ultrasound to perform macroscopic defect detection, geometric property measurement, and detection and characterization of changes in organizational structure and mechanical properties of the object being measured. Ultrasonic waves can perform non-destructive testing of internal defects in objects under test within a large thickness range without disassembling the object under test, and have the advantages of being convenient, fast and low cost.

[0053] Compared with traditional liquid batteries, semi-solid batteries have additional polymers added inside to improve the safety performance of the batteries. For example, in the preparation process of semi-solid batteries, initiators and monomers to produce polymers are added to the liquid electrolyte during the injection stage and mixed to form a mixed liquid. The mixed liquid is injected into the battery cell by an injection machine, and a polymerization reaction is initiated at the corresponding reaction temperature so that the monomers in the battery cell can be polymerized into high molecular polymers. During the polymerization reaction, the liquid electrolyte can be polymerized into a gel state along with the monomers to realize the solidification process of the electrolyte and form a semi-solid battery cell.

[0054] Since there are additional polymers distributed inside the semi-solid battery cell, an additional interface is generated inside the battery cell. The ultrasonic equipment and parameters commonly used in existing liquid batteries cannot ensure that the ultrasonic signal can pass through the semi-solid battery cell, especially when the polymer content inside the semi-solid battery cell is high or the distribution is abnormal, it is impossible to obtain an effective ultrasonic detection image. As shown in the following comparative examples 1 and 2:

[0055] Comparative Example 1

[0056] Ultrasonic air-coupled transmission imaging technology is used for liquid battery characterization, such as Figure 2 As shown, Figure 2 This is a schematic diagram of the transmission ultrasonic testing image of the liquid battery. The probe used is a flat probe with a transmission frequency of 400kHz, a sampling frequency of 10MHz, a gain of 14.4dB, a wave number of 3, and a voltage of 200V. Figure 2 It can be seen that although the image has some color depth changes, the obtained transmission image results reflect that the distribution of various materials inside the battery cell is relatively uniform.

[0057] Comparative Example 2

[0058] When ultrasound transmission technology is applied to semi-solid cells, the additional polymers distributed inside the cells create additional interfaces inside the cells. The ultrasound equipment and parameters (high-frequency transmission signals) commonly used for liquid cells cannot ensure that the ultrasound signal can pass through the semi-solid cells. Especially when the polymer content inside the semi-solid cells is high or the distribution is abnormal, ultrasound transmission cannot obtain effective images. Reducing the probe transmission frequency can effectively increase the ultrasonic penetration ability, but the corresponding resolution and image contrast will decrease, such as Figure 3 As shown, Figure 3 This is a schematic diagram of the transmission ultrasonic testing image of a semi-solid battery cell using a flat probe with a transmission frequency of 200kHz. Figure 3 It can be seen that although the low-frequency ultrasonic signal can penetrate the semi-solid battery cell, the obtained transmission signal has no contrast and it is impossible to obtain effective internal information of the semi-solid battery cell.

[0059] Based on the above conclusions, this embodiment overcomes the above problems by transmitting multiple low-frequency ultrasonic signals to the target detection point of the target semi-solid battery cell through an ultrasonic signal transmitting end (such as an ultrasonic transmitting probe), and receiving multiple transmitted ultrasonic signals or multiple reflected ultrasonic signals corresponding to the above multiple low-frequency ultrasonic signals.

[0060] In the above step S102, multiple transmitted ultrasonic signals or multiple reflected ultrasonic signals corresponding to multiple low-frequency ultrasonic signals are received, which may specifically refer to: in response to the coupling medium being air, multiple transmitted ultrasonic signals corresponding to multiple low-frequency ultrasonic signals are received; or, in response to the coupling medium being silicone oil, multiple reflected ultrasonic signals corresponding to multiple low-frequency ultrasonic signals are received. That is, the present application can use two ultrasonic coupling media, air and silicone oil, for ultrasonic detection respectively. When silicone oil is used as an ultrasonic coupling agent, the semi-solid battery cell can be immersed in the silicone oil and kept in a static state. The ultrasonic probe adopts an immersion ultrasonic probe. However, for the semi-solid battery cell, due to its edge sealing structure, there is a possibility that silicone oil will penetrate into the battery. The impurities in the silicone oil will affect the detection results. Therefore, the present embodiment preferably uses air as the ultrasonic coupling medium, and uses a transmission ultrasonic detection method to detect the target semi-solid battery cell. Figure 4As shown, during the transmission ultrasonic detection, the ultrasonic transmitting probe T and the ultrasonic receiving probe R respectively transmit ultrasonic waves and receive ultrasonic waves transmitted from the target semi-solid battery cell to be detected. The ultrasonic transmitting probe T and the ultrasonic receiving probe R are respectively located on both sides of the target semi-solid battery cell to be detected, and respectively face the upper and lower main surfaces of the target semi-solid battery cell, that is, the first detection surface and the second detection surface. Specifically, multiple target detection points on the first detection surface of the target semi-solid battery cell and multiple corresponding target detection points on the second detection surface can be selected, and the multiple target detection points can be evenly distributed on the above detection surface. During the detection, the target semi-solid battery cell can be moved relative to the ultrasonic transmitting probe T and the ultrasonic receiving probe R, so that the ultrasonic transmitting probe T transmits low-frequency ultrasonic signals to multiple target detection points on the first detection surface along the set detection path, and the ultrasonic receiving probe R receives the transmitted ultrasonic signals from multiple corresponding target detection points on the second detection surface along the set detection path. Finally, the transmission ultrasonic signals received from the corresponding multiple target detection points on the second detection surface are statistically analyzed, and the results of the ultrasonic detection are presented in the form of detection images. The parameters and detection accuracy of the ultrasonic detection will affect the imaging color. The stronger the signal strength, the darker the color of the detection point. Correspondingly, in this detection mode, the target semi-solid battery cell is detected based on multiple transmission ultrasonic signals in step S103, specifically referring to: determining the mean or sum of the signal strengths of the multiple transmission ultrasonic signals as the transmission ultrasonic signal strength information corresponding to the target detection point, and outputting the detection result of the target semi-solid battery cell based on the transmission ultrasonic signal strength information, for example, visually outputting the detection result of the target semi-solid battery cell based on the transmission ultrasonic signal strength information. In addition, in this mode, it is also necessary to obtain in advance the first corresponding relationship between the distribution status of the internal polymer of the semi-solid battery cell sample and the transmission ultrasonic signal strength, so as to associate the transmission ultrasonic signal strength of the semi-solid battery cell with the actual situation of the semi-solid battery cell, and then based on the visually output detection result of the target semi-solid battery cell and the above-mentioned first corresponding relationship (for example, comparing the detection result of the target semi-solid battery cell output based on the transmission ultrasonic signal strength information with the first corresponding relationship), the target distribution status of the internal polymer of the target semi-solid battery cell is obtained.

[0061] The reason and method for the first correspondence between the distribution of the internal polymer of the semi-solid battery sample and the intensity of the transmitted ultrasound signal in advance is that for the semi-solid battery, the addition of the polymer will produce an additional interface inside the battery. For the ultrasound signal, the ability of the polymer area inside the battery to conduct the ultrasound signal has not been clearly verified, such as Figure 6As shown, there is an interface between the polymer and the liquid system inside the battery cell, which reduces the intensity of the transmitted ultrasonic signal. However, since the ultrasonic conductivity of the polymer added to the battery cell has not been confirmed, the signal strength comparison after the ultrasonic signal passes through polymer area 1 and polymer area 2 cannot be determined. Therefore, in order to verify the correlation between the transmission intensity and the distribution state of the polymer inside the semi-solid battery cell, this embodiment carried out an accelerated aging experiment on a semi-solid battery cell sample with obviously uneven ultrasonic signals. Specifically, the semi-solid battery cell sample was quickly charged and discharged 30 times at a current of 2C, and then disassembled in a fully charged state. The disassembly result is: the semi-solid battery cell sample tends to undergo lithium precipitation in the area with low transmission signal intensity (the corresponding relationship between the lithium precipitation area and the ultrasonic detection result is shown in Figure 7 As shown in the figure, the lithium deposition area is caused by the local impedance being greater than other areas. When charging, the negative electrode potential is lower than the lithium deposition potential, inducing lithium deposition (the principle is that the polymer added to the semi-solid battery cell has a weaker ion transmission ability than the liquid electrolyte in the traditional battery cell. When the polymer content in some areas is high, the local impedance increases, and lithium deposition is prone to occur under extreme cycle conditions). According to the above-mentioned accelerated aging disassembly experiment results, it is clear that the area with weak transmitted ultrasonic signals in the ultrasonic detection results of the semi-solid battery cell should correspond to the area with more polymer distribution inside the semi-solid battery cell. This conclusion is the first corresponding relationship between the distribution of the internal polymer of the above-mentioned semi-solid battery cell sample and the intensity of the transmitted ultrasonic signal.

[0062] It should be noted that, in the case of excluding the infiltration of silicone oil into the target semi-solid battery cell (when the edge sealing area of ​​the semi-solid battery cell can be fully detected), silicone oil can also be used as the ultrasonic coupling medium. In this case, the target semi-solid battery cell can be detected by reflection ultrasonic detection. In reflection ultrasonic detection, it works based on the principle that ultrasonic waves will be strongly reflected when passing through the interface of tissues with different acoustic impedances. When sound waves propagate from one medium to another, they will be reflected at the interface between the two, and the greater the difference between the media, the greater the reflection. Therefore, ultrasonic waves with strong penetrating power and straight-line propagation can be emitted to the target detection object, and the reflected ultrasonic waves can be received. According to the order and amplitude of the reflected ultrasonic waves, the size, distribution and contrast difference degree of each medium contained in the detection object can be judged (wherein the time order of the reflected ultrasonic waves can reflect the distance of the reflection interface from the detection surface, and the amplitude can reflect the size of the medium, the degree of contrast difference and other characteristics), thereby judging the thickness information and surface morphology of the detection object and studying its internal structure. Correspondingly, in this detection mode, the target semi-solid battery cell is detected based on multiple reflected ultrasonic signals in step S103, specifically referring to: determining the mean or sum of the signal strengths of the multiple reflected ultrasonic signals as the reflected ultrasonic signal strength information corresponding to the target detection point; outputting the detection result of the target semi-solid battery cell based on the reflected ultrasonic signal strength information, for example, visually outputting the detection result of the target semi-solid battery cell based on the reflected ultrasonic signal strength information, that is, outputting the detection image corresponding to the reflected ultrasonic signal strength information. Moreover, in this mode, it is also necessary to obtain in advance the second corresponding relationship between the distribution status of the internal polymer of the semi-solid battery cell sample and the reflected ultrasonic signal strength of the semi-solid battery cell, so as to associate the reflected ultrasonic signal strength of the semi-solid battery cell with the actual situation of the semi-solid battery cell; based on the visually output detection result of the target semi-solid battery cell and the second corresponding relationship (for example, comparing the detection result of the target semi-solid battery cell output based on the above-mentioned reflected ultrasonic signal strength information with the second corresponding relationship), the target distribution status of the internal polymer of the target semi-solid battery cell is obtained.

[0063] In this embodiment, the target detection points are multiple detection points located in the middle area or edge area of ​​the target semi-solid battery cell, which are used to detect the polymer distribution status in the middle area or edge area of ​​the target semi-solid battery cell.

[0064] Example 1:

[0065] In this embodiment, since low-frequency ultrasonic waves have strong penetrability but low resolution, this embodiment uses a high-resolution signal transmission method to transmit multiple low-frequency ultrasonic signals to the target detection points of the target semi-solid battery cell. For example, the flat probe in Comparative Example 1 can be adjusted to a focused probe (to improve resolution), the probe frequency is reduced from 400kHz to 100kHz~200kHz, the sampling frequency is 10MHz, the wave number is 3~5, the scanning interval is 0.5mm, the distance between the probe and the sample is 30mm, and the number of low-frequency ultrasonic signal transmissions for each target detection point is 1 to 5 times. When the number of low-frequency ultrasonic signal transmissions for each target detection point is 1, the result is similar to the above-mentioned Comparative Example 2 (that is, the signal contrast is insufficient and effective information cannot be obtained). When the number of low-frequency ultrasonic signal transmissions for each target detection point is 3 or more, the received signal strengths are accumulated and averaged, and finally the distribution state information of the polymer inside the target semi-solid battery cell can be obtained. The detection results are as follows: Figure 5 shown.

[0066] Example 2:

[0067] The target semi-solid battery cell was characterized by air-coupled ultrasonic signal using a focused probe, with a probe frequency of 200kHz, a sampling frequency of 10MHz, a wave number of 4, a scanning interval of 0.5mm, a probe-sample distance of 30mm, and a distance of 70mm between the transmitting and receiving probes. The aluminum-plastic film edge sealing area of ​​the target semi-solid battery cell was scanned in detail. Based on the conclusions obtained in Example 1 above, the ultrasonic detection result image of Example 2 is shown in FIG. Figure 8 As shown, the low signal intensity area is marked as a shadow, which is considered to be an area with additional polymer or an area with too much polymer. The test result image shows that the edge sealing area of ​​the semi-solid soft package battery cell has polymer distributed in it. This experiment shows that in addition to determining the uniformity of the internal polymer distribution of the target semi-solid battery cell, ultrasonic scanning can quickly and non-destructively detect common edge sealing defects of semi-solid batteries.

[0068] The above-mentioned battery cell detection method provided in this embodiment transmits multiple low-frequency ultrasonic signals to the target detection point of the target semi-solid battery cell; receives multiple transmission ultrasonic signals or multiple reflection ultrasonic signals corresponding to the multiple low-frequency ultrasonic signals; and detects the target semi-solid battery cell based on the multiple transmission ultrasonic signals or multiple reflection ultrasonic signals. Since the present invention transmits multiple low-frequency ultrasonic signals to the target detection point of the target semi-solid battery cell, the low-frequency ultrasonic signal can effectively penetrate the target semi-solid battery cell, and multiple low-frequency ultrasonic signals are emitted to the same detection point, which can effectively improve the signal contrast of the transmission ultrasonic signal or the reflection ultrasonic signal on the basis of improving the penetration of the ultrasonic signal, thereby obtaining an effective ultrasonic detection image.

[0069] The above-mentioned embodiment provides a battery cell detection method. Correspondingly, an embodiment of the present application also provides a battery cell detection device. Since the device embodiment is basically similar to the method embodiment, the description is relatively simple. For details of the relevant technical features, please refer to the corresponding description of the method embodiment provided above. The following description of the device embodiment is merely illustrative.

[0070] Please refer to Fig. 9 To understand this embodiment, Fig. 9 A unit block diagram of the battery cell detection device provided in this embodiment, such as Fig. 9 As shown, the battery cell detection device provided in this embodiment includes:

[0071] A low-frequency ultrasonic signal transmitting unit 901 is used to control the ultrasonic signal transmitting end to transmit multiple low-frequency ultrasonic signals to a target detection point of a target semi-solid battery cell;

[0072] An ultrasonic signal receiving unit 902, configured to control an ultrasonic signal receiving end to receive a plurality of ultrasonic detection signals corresponding to a plurality of low-frequency ultrasonic signals;

[0073] The detection unit 903 is used to output the detection result of the battery cell based on the multiple ultrasonic detection signals.

[0074] In some embodiments, transmitting multiple low-frequency ultrasonic signals to a target detection point of a target semi-solid battery cell includes: transmitting multiple low-frequency ultrasonic signals to a target detection point of a target semi-solid battery cell in a high-resolution signal transmission manner.

[0075] In some embodiments, the plurality of ultrasonic detection signals include a plurality of ultrasonic transmission signals, and outputting the detection result of the battery cell based on the plurality of ultrasonic detection signals includes:

[0076] The average value or the sum value of the signal strengths of the multiple transmitted ultrasonic signals is determined as the transmitted ultrasonic signal strength information corresponding to the target detection point, and the detection result of the target semi-solid battery cell is output based on the transmitted ultrasonic signal strength information.

[0077] In some embodiments, the multiple ultrasonic detection signals include multiple ultrasonic reflection signals, and outputting the detection result of the battery cell based on the multiple ultrasonic detection signals includes: determining the mean or sum of the signal intensities of the multiple reflected ultrasonic signals as the reflected ultrasonic signal intensity information corresponding to the target detection point; and outputting the detection result of the target semi-solid battery cell based on the reflected ultrasonic signal intensity information.

[0078] In some embodiments, the device further comprises:

[0079] A first corresponding relationship obtaining unit, used to obtain in advance a first corresponding relationship between the distribution status of the internal polymer of the semi-solid battery core sample and the intensity of the transmitted ultrasonic signal;

[0080] A target distribution status obtaining unit is used to compare the detection result of the target semi-solid battery cell output based on the transmitted ultrasonic signal intensity information with the first corresponding relationship to obtain a target distribution status of the internal polymer of the target semi-solid battery cell.

[0081] In some embodiments, outputting the detection result of the battery cell based on the multiple reflected ultrasonic signals includes: determining the mean or sum of the signal intensities of the multiple reflected ultrasonic signals as the reflected ultrasonic signal intensity information corresponding to the target detection point; and outputting the detection result of the target semi-solid battery cell based on the reflected ultrasonic signal intensity information.

[0082] In some embodiments, the device further comprises:

[0083] A second corresponding relationship obtaining unit, used to obtain in advance a second corresponding relationship between the distribution status of the internal polymer of the semi-solid battery core sample and the reflected ultrasonic signal intensity of the semi-solid battery core;

[0084] The detection result of the target semi-solid battery cell output based on the reflected ultrasonic signal intensity information is compared with the second corresponding relationship to obtain a target distribution condition of the internal polymer of the target semi-solid battery cell.

[0085] In some embodiments, the receiving a plurality of ultrasonic detection signals corresponding to the plurality of low-frequency ultrasonic signals comprises:

[0086] In response to the coupling medium being air, receiving a plurality of transmitted ultrasonic signals corresponding to the plurality of low-frequency ultrasonic signals; or,

[0087] In response to the coupling medium being silicone oil, a plurality of reflected ultrasonic signals corresponding to the plurality of low-frequency ultrasonic signals are received.

[0088] In some embodiments, the target detection points are multiple detection points located in a middle area or an edge sealing area of ​​the target semi-solid battery cell.

[0089] The battery cell detection device provided in the embodiment of the present application emits multiple low-frequency ultrasonic signals to the target detection point of the target semi-solid battery cell. The low-frequency ultrasonic signal can effectively penetrate the target semi-solid battery cell. In addition, multiple low-frequency ultrasonic signals are emitted to the same detection point, which can effectively improve the signal contrast of the transmitted ultrasonic signal or the reflected ultrasonic signal on the basis of improving the penetration of the ultrasonic signal, thereby obtaining an effective ultrasonic detection image.

[0090] In the above-mentioned embodiments, a battery cell detection method and a battery cell detection device are provided. In addition, an embodiment of the present application also provides an electronic device. Since the electronic device embodiment is basically similar to the method embodiment, the description is relatively simple. For details of the relevant technical features, please refer to the corresponding description of the method embodiment provided above. The following description of the electronic device embodiment is only illustrative. The electronic device embodiment is as follows:

[0091] Please refer to Fig.10 To understand this embodiment, Fig.10 A schematic diagram of an electronic device provided in this embodiment.

[0092] like Fig.10 As shown, the electronic device provided in this embodiment includes: a processor 1001 and a memory 1002; the memory 1002 is used to store computer instructions, and when the computer instructions are read and executed by the processor 1001, the following operations are performed:

[0093] transmitting multiple low-frequency ultrasonic signals at target detection points of the target semi-solid battery cell;

[0094] Receiving a plurality of ultrasonic detection signals corresponding to the plurality of low-frequency ultrasonic signals;

[0095] The target semi-solid battery cell is detected based on the multiple ultrasonic detection signals, and the detection result of the battery cell is output.

[0096] In some embodiments, transmitting multiple low-frequency ultrasonic signals to a target detection point of a target semi-solid battery cell includes: transmitting multiple low-frequency ultrasonic signals to a target detection point of a target semi-solid battery cell in a high-resolution signal transmission manner.

[0097] In some embodiments, the plurality of ultrasonic detection signals include a plurality of ultrasonic transmission signals, and the detecting the target semi-solid battery cell based on the plurality of ultrasonic detection signals includes:

[0098] The average value or the sum value of the signal strengths of the multiple transmitted ultrasonic signals is determined as the transmitted ultrasonic signal strength information corresponding to the target detection point, and the detection result of the target semi-solid battery cell is output based on the transmitted ultrasonic signal strength information.

[0099] In some embodiments, the multiple ultrasonic detection signals include multiple ultrasonic reflection signals, and the detection of the target semi-solid battery cell based on the multiple ultrasonic detection signals includes: determining the mean or sum of the signal intensities of the multiple reflected ultrasonic signals as the reflected ultrasonic signal intensity information corresponding to the target detection point; and outputting the detection result of the target semi-solid battery cell based on the reflected ultrasonic signal intensity information.

[0100] In some embodiments, it further comprises:

[0101] Pre-obtaining a first corresponding relationship between the distribution of the internal polymer of the semi-solid battery core sample and the intensity of the transmitted ultrasound signal;

[0102] The detection result of the target semi-solid battery core output based on the transmitted ultrasonic signal intensity information is compared with the first corresponding relationship to obtain a target distribution condition of the internal polymer of the target semi-solid battery core.

[0103] In some embodiments, it further comprises:

[0104] Pre-obtaining a second corresponding relationship between the distribution of the internal polymer of the semi-solid battery sample and the intensity of the reflected ultrasonic signal of the semi-solid battery;

[0105] The detection result of the target semi-solid battery cell output based on the reflected ultrasonic signal intensity information is compared with the second corresponding relationship to obtain a target distribution condition of the internal polymer of the target semi-solid battery cell.

[0106] In some embodiments, the receiving a plurality of ultrasonic detection signals corresponding to the plurality of low-frequency ultrasonic signals comprises:

[0107] In response to the coupling medium being air, receiving a plurality of transmitted ultrasonic signals corresponding to the plurality of low-frequency ultrasonic signals; or,

[0108] In response to the coupling medium being silicone oil, a plurality of reflected ultrasonic signals corresponding to the plurality of low-frequency ultrasonic signals are received.

[0109] In some embodiments, the target detection points are multiple detection points located in a middle area or an edge sealing area of ​​the target semi-solid battery cell.

[0110] By using the electronic device provided in this embodiment, since it transmits multiple low-frequency ultrasonic signals to the target detection point of the target semi-solid battery cell, the low-frequency ultrasonic signal can effectively penetrate the target semi-solid battery cell, and multiple low-frequency ultrasonic signals are transmitted to the same detection point, which can effectively improve the signal contrast of the transmitted ultrasonic signal or the reflected ultrasonic signal on the basis of improving the penetration of the ultrasonic signal, thereby obtaining an effective ultrasonic detection image.

[0111] In the above-mentioned embodiments, a battery cell detection method, a battery cell detection device and an electronic device are provided. In addition, the sixth embodiment of the present application further provides a computer-readable storage medium for implementing the above-mentioned battery cell detection method. The computer-readable storage medium embodiment provided in the present application is described relatively simply. For the relevant parts, please refer to the corresponding description of the embodiment. The embodiment described below is merely illustrative.

[0112] The computer readable storage medium provided in this embodiment stores computer instructions, and when the instructions are executed by a processor, the following steps are implemented:

[0113] transmitting multiple low-frequency ultrasonic signals at target detection points of the target semi-solid battery cell;

[0114] Receiving a plurality of ultrasonic detection signals corresponding to the plurality of low-frequency ultrasonic signals;

[0115] The target semi-solid battery cell is detected based on the multiple ultrasonic detection signals, and the detection result of the battery cell is output.

[0116] In some embodiments, transmitting multiple low-frequency ultrasonic signals to a target detection point of a target semi-solid battery cell includes: transmitting multiple low-frequency ultrasonic signals to a target detection point of a target semi-solid battery cell in a high-resolution signal transmission manner.

[0117] In some embodiments, the plurality of ultrasonic detection signals include a plurality of ultrasonic transmission signals, and the detecting the target semi-solid battery cell based on the plurality of ultrasonic detection signals includes:

[0118] The average value or the sum value of the signal strengths of the multiple transmitted ultrasonic signals is determined as the transmitted ultrasonic signal strength information corresponding to the target detection point, and the detection result of the target semi-solid battery cell is output based on the transmitted ultrasonic signal strength information.

[0119] In some embodiments, the multiple ultrasonic detection signals include multiple ultrasonic reflection signals, and the detection of the target semi-solid battery cell based on the multiple ultrasonic detection signals includes: determining the mean or sum of the signal intensities of the multiple reflected ultrasonic signals as the reflected ultrasonic signal intensity information corresponding to the target detection point; and outputting the detection result of the target semi-solid battery cell based on the reflected ultrasonic signal intensity information.

[0120] In some embodiments, the method further comprises:

[0121] Pre-obtaining a first corresponding relationship between the distribution of the internal polymer of the semi-solid battery core sample and the intensity of the transmitted ultrasound signal;

[0122] The detection result of the target semi-solid battery core output based on the transmitted ultrasonic signal intensity information is compared with the first corresponding relationship to obtain a target distribution condition of the internal polymer of the target semi-solid battery core.

[0123] In some embodiments, the method further comprises:

[0124] Pre-obtaining a second corresponding relationship between the distribution of the internal polymer of the semi-solid battery sample and the intensity of the reflected ultrasonic signal of the semi-solid battery;

[0125] The detection result of the target semi-solid battery cell output based on the reflected ultrasonic signal intensity information is compared with the second corresponding relationship to obtain a target distribution condition of the internal polymer of the target semi-solid battery cell.

[0126] In some embodiments, the receiving a plurality of ultrasonic detection signals corresponding to the plurality of low-frequency ultrasonic signals comprises:

[0127] In response to the coupling medium being air, receiving a plurality of transmitted ultrasonic signals corresponding to the plurality of low-frequency ultrasonic signals; or,

[0128] In response to the coupling medium being silicone oil, a plurality of reflected ultrasonic signals corresponding to the plurality of low-frequency ultrasonic signals are received.

[0129] In some embodiments, the target detection points are multiple detection points located in a middle area or an edge sealing area of ​​the target semi-solid battery cell.

[0130] By executing the computer instructions stored on the computer-readable storage medium provided in this embodiment, since it transmits multiple low-frequency ultrasonic signals to the target detection point of the target semi-solid battery cell, the low-frequency ultrasonic signal can effectively penetrate the target semi-solid battery cell, and multiple low-frequency ultrasonic signals are transmitted to the same detection point, which can effectively improve the signal contrast of the transmitted ultrasonic signal or the reflected ultrasonic signal on the basis of improving the penetration of the ultrasonic signal, thereby obtaining an effective ultrasonic detection image.

[0131] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0132] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0133] 1. Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be used to store information by any method or technology. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include non-transitory media such as modulated data signals and carrier waves.

[0134] 2. Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems or computer program products. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0135] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for detecting a battery cell, It is characterized in that The method comprises: transmitting multiple low-frequency ultrasonic signals at target detection points of the battery cell; Receiving a plurality of ultrasonic detection signals corresponding to the plurality of low-frequency ultrasonic signals; The detection result of the battery cell is output based on the plurality of ultrasonic detection signals.

2. The method according to claim 1, It is characterized in that The transmitting a plurality of low-frequency ultrasonic signals to the target detection point of the battery cell includes: transmitting a plurality of low-frequency ultrasonic signals to the target detection point of the battery cell in a high-resolution signal transmitting manner.

3. The method according to claim 1, It is characterized in that The receiving of the plurality of ultrasonic detection signals corresponding to the plurality of low-frequency ultrasonic signals comprises: receiving a plurality of ultrasonic transmission signals corresponding to the plurality of low-frequency ultrasonic signals; Outputting the detection result of the battery cell based on the multiple ultrasonic detection signals includes: detecting the battery cell based on the multiple ultrasonic transmission signals, and outputting the detection result of the battery cell.

4. The method according to claim 3, It is characterized in that The outputting the detection result of the battery cell based on the multiple transmitted ultrasonic signals comprises: An average value or a sum value of the signal strengths of the multiple transmitted ultrasonic signals is determined as the transmitted ultrasonic signal strength information corresponding to the target detection point, and a detection result of the battery cell is output based on the transmitted ultrasonic signal strength information.

5. The method according to claim 1, It is characterized in that The receiving of the plurality of ultrasonic detection signals corresponding to the plurality of low-frequency ultrasonic signals comprises: receiving a plurality of ultrasonic reflection signals corresponding to the plurality of low-frequency ultrasonic signals; Outputting the detection result of the battery cell based on the multiple ultrasonic detection signals includes: detecting the battery cell based on the multiple ultrasonic reflection signals, and outputting the detection result of the battery cell.

6. The method according to claim 5, It is characterized in that The detecting of the battery cell based on the multiple reflected ultrasonic signals and outputting the detection result of the battery cell includes: determining the mean or sum of the signal strengths of the multiple reflected ultrasonic signals as the reflected ultrasonic signal strength information corresponding to the target detection point; and outputting the detection result of the battery cell based on the reflected ultrasonic signal strength information.

7. The method according to claim 4, It is characterized in that The method further comprises: Pre-obtaining a first corresponding relationship between the distribution of the internal polymer of the battery core sample and the intensity of the transmitted ultrasonic signal; The detection result of the battery cell output based on the transmitted ultrasonic signal intensity information is compared with the first corresponding relationship to obtain a target distribution status of the internal polymer of the battery cell.

8. The method according to claim 6, It is characterized in that The method further comprises: Pre-obtaining a second corresponding relationship between the distribution of the internal polymer of the battery core sample and the intensity of the reflected ultrasonic signal of the battery core; The detection result of the battery cell output based on the reflected ultrasonic signal intensity information is compared with the second corresponding relationship to obtain a target distribution status of the internal polymer of the battery cell.

9. The method according to claim 1, It is characterized in that The receiving of multiple ultrasonic detection signals corresponding to the multiple low-frequency ultrasonic signals includes: In response to the coupling medium being air, receiving a plurality of transmitted ultrasonic signals corresponding to the plurality of low-frequency ultrasonic signals; or, In response to the coupling medium being silicone oil, a plurality of reflected ultrasonic signals corresponding to the plurality of low-frequency ultrasonic signals are received.

10. The method according to claim 1, It is characterized in that The target detection points are multiple detection points located in the middle area or the edge sealing area of ​​the battery cell.

11. The method according to claim 1, It is characterized in that The battery cell is a semi-solid battery cell.

12. A battery cell detection device, It is characterized in that The device comprises: A low-frequency ultrasonic signal transmitting unit, used to control the ultrasonic signal transmitting end to transmit multiple low-frequency ultrasonic signals to the target detection point of the battery cell; An ultrasonic signal receiving unit, used for controlling an ultrasonic signal receiving end to receive a plurality of ultrasonic detection signals corresponding to the plurality of low-frequency ultrasonic signals; A detection unit is used to output a detection result of the battery cell based on the multiple ultrasonic detection signals.

13. An electronic device, It is characterized in that comprising a processor and a memory; wherein, The memory is used to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement the method according to any one of claims 1-11.

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