Battery deformation detection method, detection device, detection equipment and storage medium

Abstract

The invention provides a battery deformation detection method, a detection device, detection equipment and a storage medium, and the battery deformation detection method comprises the steps: transmitting an ultrasonic guided wave signal at a first detection point of a target battery module, and receiving a first propagation signal at a second detection point of the target battery module; transmitting an ultrasonic guided wave signal at a second detection point of the target battery module, and receiving a second propagation signal at a first detection point of the target battery module; performing deformation detection on the target battery module based on the first propagation signal and the second propagation signal; the initial shape of the target battery module is a symmetric structure, and the first detection point and the second detection point are symmetric points based on the symmetric axis of the symmetric structure. Based on the above mode, deformation detection can be performed on the battery.

Description

TECHNICAL FIELD

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

[0002] With the development of the times, batteries have become a commonly used energy device. For example, new energy vehicles use batteries as power sources. Multiple batteries are usually bonded to a water-cooled plate by structural adhesive to form a battery pack for power supply.

[0003] In practice, with the collision of the device in which the battery is located, such as a collision accident of a new energy vehicle, the battery in the battery pack may be deformed and damaged. However, due to the high bonding strength between the battery and the water-cooled plate, the battery cannot be disassembled without damage to detect the entire outer surface. Only viewing the visible part of the battery cannot determine whether the invisible part of the battery is deformed and damaged. In summary, the battery cannot be deformed and detected at present. SUMMARY

[0004] The technical problem solved by the present application is to provide a battery deformation detection method, a detection device, a detection equipment and a storage medium, which can detect the deformation of the battery.

[0005] In a first aspect, the present application provides a battery deformation detection method, comprising: emitting an ultrasonic guided wave signal at a first detection point of a target battery module, and receiving a first propagation signal at a second detection point of the target battery module; wherein the first propagation signal is a signal formed after the ultrasonic guided wave signal emitted from the first detection point propagates in the target battery module; emitting an ultrasonic guided wave signal at the second detection point of the target battery module, and receiving a second propagation signal at the first detection point of the target battery module; wherein the second propagation signal is a signal formed after the ultrasonic guided wave signal emitted from the second detection point propagates in the target battery module; and performing deformation detection on the target battery module based on the first propagation signal and the second propagation signal; wherein the target battery module includes one battery or at least two batteries connected to each other, the initial shape of the target battery module is a symmetrical structure, and the first detection point and the second detection point are symmetrical points based on the symmetry axis of the symmetrical structure.

[0006] In the technical solution of the embodiments of the present application, two positions on the target battery module of the initial shape of the symmetric structure are taken as the first detection point and the second detection point respectively, first, the first detection point is taken as the transmitting end to transmit the ultrasonic guided wave signal and the second detection point is taken as the receiving end to receive the first propagation signal, second, the second detection point is taken as the transmitting end to transmit the ultrasonic guided wave signal and the first detection point is taken as the receiving end to receive the second propagation signal, and finally, the first propagation signal and the second propagation signal are compared, since the first detection point and the second detection point are symmetric points, if the target battery module does not deform, the shape is still the initial shape of the symmetric structure, the propagation path of the first propagation signal and the second propagation signal is the same and the propagation direction is opposite, the similarity of the first propagation signal and the second propagation signal in signal characteristics is high, if the target battery module deforms and is no longer a symmetric structure, due to the deformation damage, scattering or absorption of the ultrasonic guided wave signal occurs, so that the similarity of the first propagation signal and the second propagation signal in signal characteristics is low, therefore, based on the comparison result of the first propagation signal and the second propagation signal, whether the visible part and the invisible part of the target battery module exist deformation damage can be determined in a non-destructive manner, and deformation detection of the battery is realized.

[0007] In some embodiments, based on the first propagation signal and the second propagation signal, the target battery module is deformed and detected, including: based on the energy value of the first difference signal obtained by subtracting the first propagation signal from the second propagation signal, the target battery module is deformed and detected.

[0008] In the technical scheme of the embodiment of the present application, two positions of the target battery module in a symmetrical structure are taken as a first detection point and a second detection point respectively, first, the first detection point is taken as a transmitting end to transmit an ultrasonic guided wave signal and the second detection point is taken as a receiving end to receive a first propagation signal, second, the second detection point is taken as a transmitting end to transmit an ultrasonic guided wave signal and the first detection point is taken as a receiving end to receive a second propagation signal, and finally, the first propagation signal and the second propagation signal are compared, since the first detection point and the second detection point are symmetrical points, if the target battery module does not deform, the shape is still the initial shape of the symmetrical structure, the propagation path of the first propagation signal and the second propagation signal is the same and the propagation directions are opposite, the similarity of the first propagation signal and the second propagation signal in signal characteristics is high, that is, the energy value of a first difference signal obtained by subtracting the first propagation signal from the second propagation signal is low, if the target battery module deforms and is no longer in a symmetrical structure, due to the deformation damage, scattering or absorption of the ultrasonic guided wave signal occurs, so that the similarity of the first propagation signal and the second propagation signal in signal characteristics is low, that is, the energy value of the first difference signal obtained by subtracting the first propagation signal from the second propagation signal is high, therefore, based on the energy value of the first difference signal obtained by subtracting the first propagation signal from the second propagation signal, deformation detection of the target battery module is performed, which can determine whether the visible part and the invisible part of the target battery module exist deformation damage in a non-destructive manner, and deformation detection of the battery is realized.

[0009] In some embodiments, the battery deformation detection method further comprises: transmitting an ultrasonic guided wave signal at a third detection point of the reference battery module, and receiving a third propagation signal at a fourth detection point of the reference battery module; wherein the third propagation signal is a signal formed after the ultrasonic guided wave signal transmitted from the third detection point propagates in the reference battery module; transmitting an ultrasonic guided wave signal at the fourth detection point of the reference battery module, and receiving a fourth propagation signal at the third detection point of the reference battery module; wherein the fourth propagation signal is a signal formed after the ultrasonic guided wave signal transmitted from the fourth detection point propagates in the reference battery module; wherein the shape of the reference battery module is the same as the initial shape of the target battery module, the relative position of the third detection point in the initial shape is the same as the relative position of the first detection point in the initial shape, and the relative position of the fourth detection point in the initial shape is the same as the relative position of the second detection point in the initial shape; based on the energy value of the first difference signal obtained by subtracting the first propagation signal from the second propagation signal, deformation detection of the target battery module comprises: based on the energy value of the first difference signal obtained by subtracting the first propagation signal from the second propagation signal, and the energy value of a second difference signal obtained by subtracting the third propagation signal from the fourth propagation signal, deformation detection of the target battery module.

[0010] In the technical solution of the embodiments of the present application, two positions of the target battery module in a symmetric structure as an initial shape are taken as a first detection point and a second detection point respectively, and two positions of a reference battery module in the same shape as the initial shape are taken as a third detection point and a fourth detection point respectively. Firstly, the ultrasonic guided wave signal is transmitted from the first detection point as a transmitting end and received by the second detection point as a receiving end to obtain a first propagation signal, and the ultrasonic guided wave signal is transmitted from the second detection point as a transmitting end and received by the first detection point as a receiving end to obtain a second propagation signal. Secondly, the ultrasonic guided wave signal is transmitted from the third detection point as a transmitting end and received by the fourth detection point as a receiving end to obtain a third propagation signal, and the ultrasonic guided wave signal is transmitted from the fourth detection point as a transmitting end and received by the third detection point as a receiving end to obtain a fourth propagation signal. Finally, a first difference signal obtained by subtracting the second propagation signal from the first propagation signal is compared with a second difference signal obtained by subtracting the first propagation signal from the second propagation signal. If the target battery module does not deform, the shape is still the initial shape of the symmetric structure, the similarity of the first difference signal and the second difference signal in signal characteristics is high, that is, the energy values of the first difference signal and the second difference signal are similar or the same. If the target battery module deforms and is no longer a symmetric structure and no longer an initial shape, the similarity of the first difference signal and the second difference signal in signal characteristics is low, that is, the energy values of the first difference signal and the second difference signal are quite different. Therefore, based on the energy values of the first difference signal and the second difference signal, the deformation of the target battery module is detected, which can determine whether the visible part and the invisible part of the target battery module are deformed in a non-destructive manner.

[0011] In some embodiments, based on the energy value of the first difference signal obtained by subtracting the second propagation signal from the first propagation signal, and the energy value of the second difference signal obtained by subtracting the fourth propagation signal from the third propagation signal, the deformation of the target battery module is detected, including: in response to the multiple obtained by dividing the energy value of the first difference signal by the energy value of the second difference signal being greater than or equal to a preset multiple threshold, it is determined that the target battery module deforms; and / or, in response to the multiple obtained by dividing the energy value of the first difference signal by the energy value of the second difference signal being less than the preset multiple threshold, it is determined that the target battery module does not deform.

[0012] In the technical solution of the embodiments of the present application, two positions of the target battery module of the initial shape of the symmetric structure are taken as the first detection point and the second detection point respectively, and two positions of the reference battery module of the same shape as the initial shape are taken as the third detection point and the fourth detection point respectively. First, the ultrasonic guided wave signal is transmitted from the first detection point as the transmitting end and received by the second detection point as the receiving end to obtain the first propagation signal, and the ultrasonic guided wave signal is transmitted from the second detection point as the transmitting end and received by the first detection point as the receiving end to obtain the second propagation signal. Second, the ultrasonic guided wave signal is transmitted from the third detection point as the transmitting end and received by the fourth detection point as the receiving end to obtain the third propagation signal, and the ultrasonic guided wave signal is transmitted from the fourth detection point as the transmitting end and received by the third detection point as the receiving end to obtain the fourth propagation signal. Finally, the first difference signal obtained by subtracting the second propagation signal from the first propagation signal is compared with the second difference signal obtained by subtracting the first propagation signal from the second propagation signal. If the target battery module does not deform, the shape is still the initial shape of the symmetric structure, the similarity of the first difference signal and the second difference signal in signal characteristics is high, that is, the energy values of the first difference signal and the second difference signal are similar or the same. If the target battery module deforms and is no longer a symmetric structure and is no longer an initial shape, the similarity of the first difference signal and the second difference signal in signal characteristics is low, that is, the energy values of the first difference signal and the second difference signal are quite different. Therefore, based on the multiple relationship between the energy value of the first difference signal and the energy value of the second difference signal, the deformation of the target battery module is detected, which can determine whether the visible part and the invisible part of the target battery module are deformed in a non-destructive manner.

[0013] In some embodiments, based on the first difference signal obtained by subtracting the second propagation signal from the first propagation signal, the deformation of the target battery module is detected, including: in response to the energy value of the first difference signal being greater than a preset energy value threshold, it is determined that the target battery module deforms; and / or, in response to the energy value of the first difference signal being less than or equal to the preset energy value threshold, it is determined that the target battery module does not deform.

[0014] In the technical solution of the embodiment of the application, two positions of the target battery module of the initial shape of the symmetric structure are taken as the first detection point and the second detection point respectively, first, the first detection point is taken as the transmitting end to transmit the ultrasonic guided wave signal and the second detection point is taken as the receiving end to receive the first propagation signal, second, the second detection point is taken as the transmitting end to transmit the ultrasonic guided wave signal and the first detection point is taken as the receiving end to receive the second propagation signal, and finally, the first propagation signal and the second propagation signal are compared, since the first detection point and the second detection point are symmetric points, if the target battery module does not deform, the shape is still the initial shape of the symmetric structure, the propagation path of the first propagation signal and the second propagation signal is the same and the propagation directions are opposite, the similarity of the first propagation signal and the second propagation signal in signal characteristics is high, that is, the energy value of the first difference signal obtained by the difference between the first propagation signal and the second propagation signal is low, if the target battery module deforms and is no longer a symmetric structure, the scattering or absorption of the ultrasonic guided wave signal occurs in the deformed part, so that the similarity of the first propagation signal and the second propagation signal in signal characteristics is low, that is, the energy value of the first difference signal obtained by the difference between the first propagation signal and the second propagation signal is high, therefore, based on the numerical relationship between the energy value of the first difference signal obtained by the difference between the first propagation signal and the second propagation signal and the preset energy value threshold, the deformation of the target battery module is detected, the determination of whether the visible part and the invisible part of the target battery module exist deformation damage can be realized in a non-destructive manner, and the deformation detection of the battery is realized.

[0015] In some embodiments, the battery deformation detection method further comprises: sequentially transmitting candidate ultrasonic guided wave signals of multiple frequency parameters at the first detection point of the target battery module, and receiving candidate propagation signals corresponding to the multiple candidate ultrasonic guided wave signals at the second detection point of the target battery module; determining one candidate propagation signal satisfying a preset condition from the multiple candidate propagation signals as the ultrasonic guided wave signal.

[0016] In the technical solution of the embodiment of the application, by sequentially transmitting candidate ultrasonic guided wave signals under multiple frequency parameters at the first detection point and receiving corresponding candidate propagation signals, whether the candidate propagation signal satisfies the preset condition is judged to determine the candidate ultrasonic guided wave signal suitable as the ultrasonic guided wave signal from the multiple frequency parameter candidate ultrasonic guided wave signals, and subsequently, the suitable candidate ultrasonic guided wave signal is taken as the ultrasonic guided wave signal to obtain the corresponding first propagation signal and the second propagation signal, so that the deformation of the target battery module can be accurately detected.

[0017] In some embodiments, the preset condition comprises that the amplitude is in a preset amplitude interval and the propagation time length is in a preset time length interval; and the candidate propagation signal satisfying the preset condition is determined as the ultrasonic guided wave signal from among the plurality of candidate propagation signals, comprising: determining, as the ultrasonic guided wave signal, the candidate propagation signal having the amplitude in the preset amplitude interval and the propagation time length in the preset time length interval from among the plurality of candidate propagation signals.

[0018] In the technical solution of the embodiments of the present application, whether the signal strength of the candidate ultrasonic guided wave signal under the corresponding frequency parameter is appropriate is determined by judging whether the amplitude of the candidate propagation signal is in the preset amplitude interval, and whether the candidate propagation signal under the corresponding frequency parameter can patrol the entire target battery module for comprehensive detection is determined by judging whether the propagation time length of the candidate propagation signal is in the preset time length interval. In summary, the accuracy and reliability of the battery deformation detection can be improved.

[0019] In some embodiments, the first detection point is located at the positive electrode of the target battery module, and the second detection point is located at the negative electrode of the target battery module; or the first detection point is located at the negative electrode of the target battery module, and the second detection point is located at the positive electrode of the target battery module.

[0020] In the technical solution of the embodiments of the present application, by taking the positions of two symmetric points, such as the positions of the positive electrode and the negative electrode, on the target battery module with the initial shape of the symmetric structure as the first detection point and the second detection point respectively, firstly, the ultrasonic guided wave signal is emitted from the first detection point as the transmitting end and received by the second detection point as the receiving end; secondly, the ultrasonic guided wave signal is emitted from the second detection point as the transmitting end and received by the first detection point as the receiving end; and finally, the first propagation signal and the second propagation signal are compared. Since the first detection point and the second detection point are symmetric points, if the target battery module has not deformed and the shape is still the initial shape of the symmetric structure, the propagation paths of the first propagation signal and the second propagation signal are the same and the propagation directions are opposite, and the similarity of the first propagation signal and the second propagation signal in signal characteristics is high. If the target battery module has deformed and is no longer a symmetric structure, the scattering or absorption of the ultrasonic guided wave signal will occur in the deformed and damaged part, so that the similarity of the first propagation signal and the second propagation signal in signal characteristics is low. Therefore, based on the comparison result of the first propagation signal and the second propagation signal, whether the visible part and the invisible part of the target battery module have deformation damage can be determined in a non-destructive manner, and the deformation detection of the battery can be realized.

[0021] In a second aspect, the present application provides a detection device, comprising: a first signal generation unit configured to emit an ultrasonic guided wave signal at a first detection point of a target battery module, and receive a first propagation signal at a second detection point of the target battery module; wherein the first propagation signal is a signal formed after the ultrasonic guided wave signal emitted from the first detection point propagates in the target battery module; a second signal generation unit configured to emit an ultrasonic guided wave signal at the second detection point of the target battery module, and receive a second propagation signal at the first detection point of the target battery module; wherein the second propagation signal is a signal formed after the ultrasonic guided wave signal emitted from the second detection point propagates in the target battery module; and a processing unit configured to perform deformation detection on the target battery module based on the first propagation signal and the second propagation signal; wherein the target battery module comprises one battery or at least two batteries connected to each other, and the initial shape of the target battery module is a symmetrical structure, and the first detection point and the second detection point are symmetrical points based on a symmetry axis of the symmetrical structure.

[0022] In a third aspect, the present application provides a detection device, comprising: a memory and a processor; the memory is configured to store program instructions, and the processor is configured to execute the program instructions to implement the above method.

[0023] In a fourth aspect, the present application provides a computer readable storage medium, which stores program instructions, and the program instructions are executed by a processor to implement the above method.

[0024] It can be understood that the beneficial effects of the above-mentioned second aspect, third aspect and fourth aspect can be referred to the related description in the above-mentioned first aspect, which will not be repeated here.

[0025] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, and can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0027] Figure 1 is a flow diagram of one or more embodiments of the battery deformation detection method provided by the present application.

[0028] Figure 2 is a structural diagram of one or more embodiments of the target battery module provided by the present application.

[0029] Figure 3 is a structural schematic diagram of one or more embodiments of the computer, data acquisition card, power amplifier and target battery module provided in the present application.

[0030] Figure 4 is a waveform schematic diagram of one or more embodiments of the first propagation signal provided in the present application.

[0031] Figure 5 is a waveform schematic diagram of one or more embodiments of the second propagation signal provided in the present application.

[0032] Figure 6 is a waveform schematic diagram of one or more embodiments of the first difference signal provided in the present application.

[0033] Figure 7 is a waveform schematic diagram of one or more embodiments of the second difference signal provided in the present application.

[0034] Figure 8 is a histogram schematic diagram of one or more embodiments of the energy value of the first difference signal and the energy value of the second difference signal provided in the present application.

[0035] Figure 9 is a structural schematic diagram of one or more embodiments of the detection device provided in the present application.

[0036] Figure 10 is a structural schematic diagram of one or more embodiments of the detection device provided in the present application.

[0037] Figure 11 is a structural schematic diagram of one or more embodiments of the computer readable storage medium provided in the present application. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0040] In the description of the embodiments of the present application, the technical terms "first", "second" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly and specifically limited.

[0041] Reference herein to "embodiments" means that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0042] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0043] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0044] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0045] With the development of the times, batteries have become a commonly used energy device, for example, new energy vehicles are powered by batteries, and multiple batteries are usually bonded to the water cooling plate in a structural adhesive bonding manner to form a battery pack for power supply.

[0046] In practice, the battery pack of the new energy vehicle is usually close to the ground, and is easily collided by road protrusions or splashing stones, etc., causing irreversible deformation damage of the batteries in the battery pack.

[0047] In practice, with the collision of the device where the battery is located, such as the collision of a new energy vehicle or other things, the battery in the battery pack may be damaged, such as deformation, but due to the high adhesion strength between the battery and the water-cooled plate, such as the high adhesion strength when using α-cyanoacrylate glue as a coupling agent for adhesion, the battery cannot be removed without damage to detect the full external surface, and only looking at the visible part of the battery cannot determine whether the invisible part of the battery is deformed. The invisible part can include the adhesion part of the battery and the water-cooled plate, and also include the internal part of the battery. These deformations are difficult to accurately determine whether they occur only by observing the external appearance of the battery, and disassembling the battery faces the removal of the adhesive and the disconnection of the high-voltage interface, as well as the screening of the circuit therein, which is costly and easy to cause the waterproof performance of the battery to decrease.

[0048] In summary, the battery cannot be deformed at present, and how to non-destructively detect the battery to determine whether the battery is deformed is a problem to be solved in the art.

[0049] Based on the above considerations, the present application provides a battery deformation detection method, a detection device, a detection equipment and a storage medium. The battery deformation detection method comprises: emitting an ultrasonic guided wave signal at a first detection point of a target battery module, and receiving a first propagation signal at a second detection point of the target battery module; emitting an ultrasonic guided wave signal at the second detection point of the target battery module, and receiving a second propagation signal at the first detection point of the target battery module; based on the first propagation signal and the second propagation signal, deforming the target battery module; the initial shape of the target battery module is a symmetrical structure, and the first detection point and the second detection point are symmetrical points based on the symmetry axis of the symmetrical structure. Based on the above method, the battery can be deformed.

[0050] According to some embodiments of the present application, please refer to Figure 1 , Figure 1 is a flowchart of one or more embodiments of the battery deformation detection method provided by the present application.

[0051] Among them, the target battery module can include one battery or at least two batteries connected to each other, and the initial shape of the target battery module is a symmetrical structure, and the first detection point and the second detection point are symmetrical points based on the symmetry axis of the symmetrical structure. In an example, the target battery module can refer to one or two or more batteries in the battery pack described above.

[0052] As Figure 1 shown, the battery deformation detection method comprises: Step S101: Emit an ultrasonic guided wave signal at a first detection point of a target battery module, and receive a first propagation signal at a second detection point of the target battery module.

[0053] The first propagation signal is a signal formed after the ultrasonic guided wave signal emitted from the first detection point propagates in the target battery module.

[0054] The device for emitting the ultrasonic guided wave signal can be connected to the first detection point, and the device for receiving the first propagation signal formed after the ultrasonic guided wave signal propagates in the target battery module can be connected to the second detection point, so that the corresponding first propagation signal is received at the second detection point after the ultrasonic guided wave signal is emitted at the first detection point.

[0055] Step S102: Emit the ultrasonic guided wave signal at the second detection point of the target battery module, and receive the second propagation signal at the first detection point of the target battery module.

[0056] The second propagation signal is a signal formed after the ultrasonic guided wave signal emitted from the second detection point propagates in the target battery module.

[0057] The device for emitting the ultrasonic guided wave signal can be connected to the second detection point, and the device for receiving the second propagation signal formed after the ultrasonic guided wave signal propagates in the target battery module can be connected to the first detection point, so that the corresponding second propagation signal is received at the first detection point after the ultrasonic guided wave signal is emitted at the second detection point.

[0058] Step S103: Perform deformation detection on the target battery module based on the first propagation signal and the second propagation signal.

[0059] The first propagation signal and the second propagation signal can be compared to determine whether there is a difference between the propagation process corresponding to the first propagation signal and the propagation process corresponding to the second propagation signal. When the target battery module deforms, the scattering and absorption of ultrasonic guided waves by the deformation position can easily cause the difference to occur and expand, so the first propagation signal and the second propagation signal can be analyzed to determine whether the target battery module deforms.

[0060] In an example, refer to Figure 2 , Figure 2 is a structural schematic diagram of one or more embodiments of the target battery module provided in the present application.

[0061] A plurality of batteries can be provided in the battery pack. It is assumed that the first battery 1 and the second battery 2 connected in series by the electrical connection sheet E are the target battery module suspected to be damaged. The battery pack can be a CTP battery pack for vehicles, or other types of battery packs, which are not limited here.

[0062] Since in practice, the battery pack can be exposed after the top cover is opened, only the electrode setting part of the battery, the positive electrode of the first battery 1 can be used as the first detection point, the first piezoelectric transducer A is arranged at the first detection point, and the negative electrode of the second battery 2 is used as the second detection point, and the second piezoelectric transducer B is arranged at the second detection point.

[0063] First, the first piezoelectric transducer A emits an ultrasonic guided wave signal, and the second piezoelectric transducer B receives a first propagation signal, and then the second piezoelectric transducer B emits an ultrasonic guided wave signal, and the first piezoelectric transducer A receives a second propagation signal.

[0064] Based on the first propagation signal and the second propagation signal, corresponding analysis and processing are performed, that is, whether the target battery module has deformation damage is determined, and battery deformation detection is realized.

[0065] In practice, the battery can be a lithium iron phosphate battery, the anode material layer can be graphite, the cathode material layer can be lithium iron phosphate, the rated capacity of the battery can be 117 ampere-hours, and the working voltage can be 3.0-4.2 volts. The above is only an example, and other types of batteries can also be used, which are not limited here.

[0066] In another example, please refer to Figure 3 , Figure 3 is a structural schematic diagram of one or more embodiments of the computer, data acquisition card, power amplifier and target battery module provided by the present application.

[0067] Taking the example that the target battery module only includes one battery, the positive electrode of the battery can be used as the first detection point, the first piezoelectric transducer A is arranged at the first detection point, and the negative electrode of the battery can be used as the second detection point, and the second piezoelectric transducer B is arranged at the second detection point.

[0068] The data acquisition card can be connected to the second piezoelectric transducer B, the computer and the power amplifier respectively, and the power amplifier is connected to the first piezoelectric transducer A, so as to emit an ultrasonic guided wave signal based on the first piezoelectric transducer A, and receive a first propagation signal based on the second piezoelectric transducer B.

[0069] Then, the power amplifier is switched from connecting the first piezoelectric transducer A to connecting the second piezoelectric transducer B, and the data acquisition card is switched from connecting the second piezoelectric transducer B to connecting the first piezoelectric transducer A, and then an ultrasonic guided wave signal is emitted based on the second piezoelectric transducer B, and a second propagation signal is received based on the first piezoelectric transducer A.

[0070] The computer is connected with a data acquisition card through a serial port, an output end of the data acquisition card is connected with a power amplifier, a receiving end of the data acquisition card is connected with a corresponding piezoelectric transducer to receive a corresponding propagation signal, and the computer can output a signal of a corresponding frequency parameter to the power amplifier through the data acquisition card to perform power amplification, so that the power amplifier outputs a corresponding ultrasonic guided wave signal through the corresponding piezoelectric transducer.

[0071] The two positions of the target battery module in the initial shape of the symmetric structure are taken as the first detection point and the second detection point, respectively, the first detection point is taken as the transmitting end to transmit the ultrasonic guided wave signal, and the second detection point is taken as the receiving end to receive the first propagation signal, the second detection point is taken as the transmitting end to transmit the ultrasonic guided wave signal, and the first detection point is taken as the receiving end to receive the second propagation signal, and finally, the first propagation signal and the second propagation signal are compared, if the target battery module does not deform, the shape is still the initial shape of the symmetric structure, the propagation path of the first propagation signal and the second propagation signal is the same and the propagation direction is opposite, the similarity of the first propagation signal and the second propagation signal in the signal characteristics is high, if the target battery module deforms and is no longer a symmetric structure, the scattering or absorption of the ultrasonic guided wave signal will occur in the deformed and damaged part, so that the similarity of the first propagation signal and the second propagation signal in the signal characteristics is low, therefore, based on the comparison result of the first propagation signal and the second propagation signal, whether the visible part and the invisible part of the target battery module are deformed and damaged can be determined in a non-destructive manner, and the deformation detection of the battery is realized.

[0072] According to some embodiments of the present application, step S103 can include: Based on the energy value of the first difference signal obtained by subtracting the first propagation signal from the second propagation signal, the target battery module is deformed and detected.

[0073] Specifically, the energy value of the first difference signal can be obtained by calculating the time domain amplitude average value of the first difference signal or integrating the frequency spectrum.

[0074] If the currently measured energy value of the first difference signal is significantly different from the energy value of the first difference signal measured when the target battery module does not deform and damage, it can be considered that the target battery module has deformation and damage, otherwise, if the difference is small, it can be considered that the target battery module does not have deformation and damage.

[0075] The application takes two positions symmetrical to each other on the target battery module as the first detection point and the second detection point, respectively, first transmits an ultrasonic guided wave signal from the first detection point and receives a first propagation signal at the second detection point, then transmits an ultrasonic guided wave signal from the second detection point and receives a second propagation signal at the first detection point, and finally compares the first propagation signal with the second propagation signal. If the target battery module has not deformed and is still in the initial shape of the symmetrical structure, the propagation path of the first propagation signal is the same as that of the second propagation signal, but the propagation directions are opposite, the similarity of the first propagation signal and the second propagation signal in signal characteristics is high, that is, the energy value of the first difference signal obtained by subtracting the first propagation signal from the second propagation signal is low. If the target battery module has deformed and is no longer in the symmetrical structure, the scattering or absorption of the ultrasonic guided wave signal will occur in the deformed part, so that the similarity of the first propagation signal and the second propagation signal in signal characteristics is low, that is, the energy value of the first difference signal obtained by subtracting the first propagation signal from the second propagation signal is high. Therefore, the deformation of the target battery module is detected based on the energy value of the first difference signal obtained by subtracting the first propagation signal from the second propagation signal, which can determine whether the visible part and the invisible part of the target battery module are deformed in a non-destructive manner, and the deformation of the battery is detected.

[0076] In some embodiments, the battery deformation detection method can further include: The ultrasonic guided wave signal is transmitted at the third detection point of the reference battery module, and the third propagation signal is received at the fourth detection point of the reference battery module. The third propagation signal is a signal formed after the ultrasonic guided wave signal transmitted from the third detection point propagates in the reference battery module.

[0077] The ultrasonic guided wave signal is transmitted at the fourth detection point of the reference battery module, and the fourth propagation signal is received at the third detection point of the reference battery module. The fourth propagation signal is a signal formed after the ultrasonic guided wave signal transmitted from the fourth detection point propagates in the reference battery module.

[0078] The shape of the reference battery module is the same as the initial shape of the target battery module, the relative position of the third detection point in the initial shape is the same as that of the first detection point in the initial shape, and the relative position of the fourth detection point in the initial shape is the same as that of the second detection point in the initial shape.

[0079] The deformation of the target battery module is detected based on the energy value of the first difference signal obtained by subtracting the first propagation signal from the second propagation signal, which includes: The energy value of a first difference signal obtained by subtracting the first propagation signal from the second propagation signal and the energy value of a second difference signal obtained by subtracting the third propagation signal from the fourth propagation signal are compared to determine whether the target battery module is deformed.

[0080] Specifically, as shown in Figure 2 The third battery 3 and the fourth battery 4 connected in series by the electric connecting piece E are assumed to be a reference battery module without deformation, and the internal structure and the external shape of the reference battery module are consistent with the initial internal structure and the initial shape of the target battery module, that is, the structure of the target battery module is the same as that of the reference battery module if the target battery module is also without deformation.

[0081] The positive electrode of the third battery 3 is taken as a third detection point, and the third piezoelectric transducer C is arranged at the third detection point. The negative electrode of the fourth battery 4 is taken as a fourth detection point, and the fourth piezoelectric transducer D is arranged at the fourth detection point.

[0082] First, the third piezoelectric transducer C emits an ultrasonic guided wave signal, and the fourth piezoelectric transducer D receives the third propagation signal. Then, the fourth piezoelectric transducer D emits an ultrasonic guided wave signal, and the third piezoelectric transducer C receives the fourth propagation signal.

[0083] The energy value of a first difference signal obtained by subtracting the first propagation signal from the second propagation signal and the energy value of a second difference signal obtained by subtracting the third propagation signal from the fourth propagation signal are compared to determine whether the target battery module is deformed.

[0084] The application firstly takes two positions of the target battery module as the first detection point and the second detection point, respectively, and takes two positions of the reference battery module as the third detection point and the fourth detection point, respectively, then transmits the ultrasonic guided wave signal from the first detection point and receives the first propagation signal at the second detection point, transmits the ultrasonic guided wave signal from the second detection point and receives the second propagation signal at the first detection point, transmits the ultrasonic guided wave signal from the third detection point and receives the third propagation signal at the fourth detection point, and transmits the ultrasonic guided wave signal from the fourth detection point and receives the fourth propagation signal at the third detection point, and finally compares the first difference signal obtained by subtracting the second propagation signal from the first propagation signal with the second difference signal obtained by subtracting the first propagation signal from the second propagation signal, if the target battery module does not deform, the shape is still the initial shape of the symmetric structure, the similarity of the first difference signal and the second difference signal in signal characteristics is high, that is, the energy values of the first difference signal and the second difference signal are similar or the same, if the target battery module deforms and is no longer a symmetric structure and no longer an initial shape, the similarity of the first difference signal and the second difference signal in signal characteristics is low, that is, the energy values of the first difference signal and the second difference signal are quite different, therefore, based on the energy values of the first difference signal and the second difference signal, the deformation of the target battery module is detected, which can determine whether the visible part and the invisible part of the target battery module are deformed in a non-destructive manner.

[0085] Optionally, based on the energy value of the first difference signal obtained by subtracting the second propagation signal from the first propagation signal, and the energy value of the second difference signal obtained by subtracting the fourth propagation signal from the third propagation signal, the deformation of the target battery module is detected, including: In response to the multiple of the energy value of the first difference signal divided by the energy value of the second difference signal being greater than or equal to a preset multiple threshold, it is determined that the target battery module deforms.

[0086] and / or, In response to the multiple of the energy value of the first difference signal divided by the energy value of the second difference signal being less than a preset multiple threshold, it is determined that the target battery module does not deform.

[0087] Specifically, for example, please refer to Figures 4 to 8 , Figure 4 is a waveform diagram of one or more embodiments of the first propagation signal provided by the application, Figure 5 is a waveform diagram of one or more embodiments of the second propagation signal provided by the application, Figure 6is a waveform diagram of one or more embodiments of the first difference signal provided by the present application, Figure 7 is a waveform diagram of one or more embodiments of the second difference signal provided by the present application, Figure 8 is a histogram diagram of one or more embodiments of the energy value of the first difference signal and the energy value of the second difference signal provided by the present application.

[0088] As shown in Figure 4 is a voltage-time waveform diagram of the first propagation signal, as Figure 5 is a voltage-time waveform diagram of the second propagation signal, as Figure 6 is a voltage-time waveform diagram of the first difference signal obtained by subtracting the second propagation signal from the first propagation signal, as Figure 7 is a voltage-time waveform diagram of the second difference signal obtained by subtracting the fourth propagation signal from the third propagation signal.

[0089] As shown in Figure 8 , the energy value of 51.85 can be obtained by performing spectral integration on the first difference signal shown in Figure 6 , and the energy value of 0.11 can be obtained by performing spectral integration on the second difference signal shown in Figure 7 . It can be seen that the energy value of the first difference signal is about 471 times the energy value of the second difference signal. Assuming that the preset multiple threshold is 2 times, 471 times is greater than 2 times, so it can be determined that the target battery module at this time exists deformation damage. Conversely, if in other examples, it is still assumed that the preset multiple threshold is 2 times, and the multiple of the energy value of the first difference signal relative to the energy value of the second difference signal is less than 2 times, then it can be determined that the target battery module at this time does not exist deformation damage.

[0090] The application takes two positions of a target battery module as a first detection point and a second detection point, respectively, and takes two positions of a reference battery module as a third detection point and a fourth detection point, respectively, and then transmits an ultrasonic guided wave signal from the first detection point and receives a first propagation signal at the second detection point, transmits an ultrasonic guided wave signal from the second detection point and receives a second propagation signal at the first detection point, transmits an ultrasonic guided wave signal from the third detection point and receives a third propagation signal at the fourth detection point, and transmits an ultrasonic guided wave signal from the fourth detection point and receives a fourth propagation signal at the third detection point. Finally, a first difference signal obtained by subtracting the second propagation signal from the first propagation signal is compared with a second difference signal obtained by subtracting the first propagation signal from the second propagation signal. If the target battery module has not deformed, the shape is still the initial shape of the symmetric structure, the similarity of the first difference signal and the second difference signal in signal characteristics is high, that is, the energy values of the first difference signal and the second difference signal are similar or the same. If the target battery module has deformed and is no longer a symmetric structure and no longer an initial shape, the similarity of the first difference signal and the second difference signal in signal characteristics is low, that is, the energy values of the first difference signal and the second difference signal are quite different. Therefore, based on the multiple relationship between the energy value of the first difference signal and the energy value of the second difference signal, the deformation of the target battery module is detected, which can determine whether the visible part and the invisible part of the target battery module have deformation damage in a non-destructive way, and the deformation of the battery is detected.

[0091] In some embodiments, based on the first difference signal obtained by subtracting the second propagation signal from the first propagation signal, the deformation of the target battery module is detected, including: In response to the energy value of the first difference signal being greater than a preset energy value threshold, it is determined that the target battery module has deformed.

[0092] and / or, In response to the energy value of the first difference signal being less than or equal to a preset energy value threshold, it is determined that the target battery module has not deformed.

[0093] Specifically, the first difference signal can be integrated to obtain an energy value, such as Figure 8As shown, assuming that the energy value of the second difference signal of the reference battery module is 0.11, the preset energy value threshold can be set to 0.11. If the energy value of the first difference signal is greater than 0.11, it can be determined that the target battery module has deformation damage. If the energy value of the first difference signal is less than or equal to 0.11, it can be determined that the target battery module does not have deformation damage. In other examples, the preset energy value threshold can also be 0.05 or 1 or 5 or other values, which can be determined according to actual needs, and is not limited here.

[0094] In the present application, two positions of the target battery module with an initial shape of a symmetric structure are taken as a first detection point and a second detection point, respectively. First, the first detection point is taken as a transmitting end to transmit an ultrasonic guided wave signal, and the second detection point is taken as a receiving end to receive a first propagation signal. Second, the second detection point is taken as a transmitting end to transmit an ultrasonic guided wave signal, and the first detection point is taken as a receiving end to receive a second propagation signal. Finally, the first propagation signal and the second propagation signal are compared. Since the first detection point and the second detection point are symmetric points, if the target battery module does not deform, the shape is still the initial shape of the symmetric structure, the propagation path of the first propagation signal and the second propagation signal is the same and the propagation direction is opposite, the similarity of the first propagation signal and the second propagation signal in signal characteristics is high, that is, the energy value of the first difference signal obtained by subtracting the first propagation signal from the second propagation signal is low. If the target battery module deforms and is no longer a symmetric structure, the part that deforms will scatter or absorb the ultrasonic guided wave signal, so that the similarity of the first propagation signal and the second propagation signal in signal characteristics is low, that is, the energy value of the first difference signal obtained by subtracting the first propagation signal from the second propagation signal is high. Therefore, based on the numerical relationship between the energy value of the first difference signal obtained by subtracting the first propagation signal from the second propagation signal and the preset energy value threshold, the deformation of the target battery module is detected, which can determine whether the visible part and the invisible part of the target battery module have deformation damage in a non-destructive manner, and the deformation of the battery is detected.

[0095] According to some embodiments of the present application, the battery deformation detection method further comprises: The first detection point of the target battery module transmits a plurality of candidate ultrasonic guided wave signals with different frequency parameters in sequence, and the second detection point of the target battery module receives a plurality of candidate propagation signals corresponding to the plurality of candidate ultrasonic guided wave signals, respectively.

[0096] One of the plurality of candidate propagation signals that satisfies a preset condition is determined as the ultrasonic guided wave signal.

[0097] Specifically, as Figure 3As shown, the signal output frequency and the sampling frequency of the data acquisition card are both 2MHz.

[0098] For the sampling process of the propagation signal, the sampling duration is 3000 microseconds, that is, 6000 data points can be collected in a single sampling to form the corresponding propagation signal.

[0099] For the transmission process of the ultrasonic guided wave signal, the excitation period can be set to 20 to generate a Hanning window modulated sinusoidal signal with a period of 20, and the peak-to-peak value of the signal is 10 volts, that is, the corresponding ultrasonic guided wave signal is generated and transmitted.

[0100] The present application can determine the candidate ultrasonic guided wave signal suitable as the ultrasonic guided wave signal from the candidate ultrasonic guided wave signals with multiple frequency parameters by judging whether the candidate propagation signal meets the preset condition, and subsequently use the suitable candidate ultrasonic guided wave signal as the ultrasonic guided wave signal to obtain the corresponding first propagation signal and second propagation signal, thereby performing more accurate deformation detection on the target battery module.

[0101] In some embodiments, the preset condition includes that the amplitude is in the preset amplitude range and the propagation duration is in the preset duration range.

[0102] Determining one candidate propagation signal meeting the preset condition from the multiple candidate propagation signals as the ultrasonic guided wave signal includes: Determining one candidate propagation signal with the amplitude in the preset amplitude range and the propagation duration in the preset duration range from the multiple candidate propagation signals as the ultrasonic guided wave signal.

[0103] Specifically, the frequency parameter can include a center frequency, and can also include a frequency width and other types of frequency parameters, which are not limited here.

[0104] Before step S101 is performed, multiple candidate ultrasonic guided wave signals with the center frequency in the frequency range of 30kHz to 100kHz can be transmitted at the first detection point to obtain the corresponding candidate propagation signals at the second detection point.

[0105] By determining whether the amplitude of each candidate propagation signal is in the preset amplitude interval, it can be determined whether the signal strength of the received propagation signal is appropriate when the candidate ultrasonic guided wave signal based on the corresponding frequency parameter is used for deformation detection. In addition, by determining whether the propagation time length of each candidate propagation signal is in the preset time length interval, it can be determined whether the received propagation signal has circled each part of the target battery module when the candidate ultrasonic guided wave signal based on the corresponding frequency parameter is used for deformation detection. In this way, the most appropriate signal of the frequency parameter can be selected from the candidate ultrasonic guided wave signals of multiple frequency parameters as the ultrasonic guided wave signal used in steps S101-S103.

[0106] In an example, a candidate ultrasonic guided wave signal with a center frequency of 43 kHz can be selected as the ultrasonic guided wave signal used in steps S101-S103. In other examples, due to different conditions of the target battery module or battery pack, other candidate ultrasonic guided wave signals with different center frequencies can also be selected as the ultrasonic guided wave signal used in steps S101-S103, which are not limited here.

[0107] The present application determines whether the signal strength of the candidate ultrasonic guided wave signal under the corresponding frequency parameter is appropriate by judging whether the amplitude of the candidate propagation signal is in the preset amplitude interval, and determines whether the candidate propagation signal under the corresponding frequency parameter can circulate the entire target battery module for comprehensive detection by judging whether the propagation time length of the candidate propagation signal is in the preset time length interval. In summary, the accuracy and reliability of battery deformation detection can be improved.

[0108] According to some embodiments of the present application, a first preset number of first difference signals can be obtained, averaged to obtain a final first difference signal, and / or a second preset number of second difference signals can be obtained, averaged to obtain a final second difference signal.

[0109] Specifically, the first preset number can be 3 or 5 or 10 or other numbers, which are not limited here.

[0110] The second preset number can be 3 or 5 or 10 or other numbers, which are not limited here.

[0111] According to some embodiments of the present application, the first detection point is located at the positive electrode of the target battery module, and the second detection point is located at the negative electrode of the target battery module.

[0112] Alternatively, The first detection point is located at the negative electrode of the target battery module, and the second detection point is located at the positive electrode of the target battery module.

[0113] In the technical solution of the embodiment of the application, two positions that are symmetrical points of the target battery module in the initial symmetrical structure, such as the positive electrode and the negative electrode, are taken as the first detection point and the second detection point respectively, first, the ultrasonic guided wave signal is transmitted from the first detection point as the transmitting end and the first propagation signal is received at the second detection point as the receiving end, second, the ultrasonic guided wave signal is transmitted from the second detection point as the transmitting end and the second propagation signal is received at the first detection point as the receiving end, and finally, the first propagation signal and the second propagation signal are compared, since the first detection point and the second detection point are symmetrical points, if the target battery module does not deform, the shape is still the initial shape of the symmetrical structure, the propagation path of the first propagation signal and the second propagation signal is the same and the propagation directions are opposite, the similarity of the first propagation signal and the second propagation signal in signal characteristics is high, if the target battery module deforms and is no longer a symmetrical structure, the scattering or absorption of the ultrasonic guided wave signal occurs in the deformed and damaged part, so that the similarity of the first propagation signal and the second propagation signal in signal characteristics is low, therefore, based on the comparison result of the first propagation signal and the second propagation signal, whether the deformed and damaged part exists in the visible part and the invisible part of the target battery module can be determined in a non-destructive manner, and the deformation detection of the battery is realized.

[0114] According to some embodiments of the application, refer to Figure 9 , Figure 9 a structural schematic diagram of one or more embodiments of the detection device provided by the application.

[0115] The detection device 10 comprises a first signal generation unit 11, a second signal generation unit 12 and a processing unit 13.

[0116] The first signal generation unit 11 is configured to transmit the ultrasonic guided wave signal at the first detection point of the target battery module, and receive the first propagation signal at the second detection point of the target battery module. The first propagation signal is the signal formed after the ultrasonic guided wave signal transmitted from the first detection point propagates in the target battery module.

[0117] The second signal generation unit 12 is configured to transmit the ultrasonic guided wave signal at the second detection point of the target battery module, and receive the second propagation signal at the first detection point of the target battery module. The second propagation signal is the signal formed after the ultrasonic guided wave signal transmitted from the second detection point propagates in the target battery module.

[0118] The processing unit 13 is configured to perform deformation detection on the target battery module based on the first propagation signal and the second propagation signal.

[0119] The target battery module includes one battery or at least two batteries connected to each other. The initial shape of the target battery module is a symmetrical structure, and the first detection point and the second detection point are symmetrical to each other based on the axis of symmetry of the symmetrical structure.

[0120] This application uses two symmetrical points on a target battery module with an initial symmetrical structure as a first detection point and a second detection point, respectively. First, an ultrasonic guided wave signal is emitted from the first detection point and received from the second detection point. Second, an ultrasonic guided wave signal is emitted from the second detection point and received from the first detection point. Finally, the first and second propagation signals are compared. Since the first and second detection points are symmetrical, if the target battery module does not deform, its shape remains the initial symmetrical structure. The first and second propagation signals have the same propagation path but opposite propagation directions. The first and second propagation signals have a high similarity in signal characteristics. If the target battery module is deformed and is no longer a symmetrical structure, the ultrasonic guided wave signal will be scattered or absorbed in the deformed and damaged part, resulting in a low similarity in signal characteristics between the first and second propagation signals. Therefore, based on the comparison results of the first and second propagation signals, it is possible to determine whether there is deformation damage in the visible and invisible parts of the target battery module in a non-destructive manner, thus realizing deformation detection of the battery.

[0121] Please refer to some embodiments of this application. Figure 10 , Figure 10 A schematic diagram of one or more embodiments of the testing equipment provided in this application.

[0122] The detection device 20 includes a processor 21, a memory 22, and a bus 23.

[0123] The processor 21 and the memory 22 are respectively connected to the bus 23. The memory 22 stores program instructions, and the processor 21 is used to execute the program instructions to implement the battery deformation detection method in the above embodiment.

[0124] In this embodiment, processor 21 can also be referred to as CPU (Central Processing Unit). Processor 21 may be an integrated circuit chip with signal processing capabilities. Processor 21 can also be a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component. The general-purpose processor can be a microprocessor, or processor 21 can be any conventional processor.

[0125] The application takes two positions which are symmetrical points on a target battery module with an initial shape of a symmetrical structure as a first detection point and a second detection point respectively, firstly, transmits an ultrasonic guided wave signal from the first detection point as a transmitting end and receives a first propagation signal from the second detection point as a receiving end, secondly, transmits an ultrasonic guided wave signal from the second detection point as a transmitting end and receives a second propagation signal from the first detection point as a receiving end, and finally, compares the first propagation signal with the second propagation signal, if the target battery module does not deform, the first propagation signal and the second propagation signal have the same propagation path and opposite propagation directions, and the similarity of the first propagation signal and the second propagation signal in signal characteristics is high, if the target battery module deforms and is no longer a symmetrical structure, the scattering or absorption of the ultrasonic guided wave signal occurs in the deformed and damaged part, so that the similarity of the first propagation signal and the second propagation signal in signal characteristics is low, therefore, based on the comparison result of the first propagation signal and the second propagation signal, whether the visible part and the invisible part of the target battery module have deformation damage can be determined in a non-destructive manner, and the deformation detection of the battery is realized.

[0126] According to some embodiments of the application, please refer to Figure 11 , Figure 11 for the structural schematic diagram of one or more embodiments of the computer readable storage medium provided by the application.

[0127] The computer readable storage medium 30 stores program instructions 31 thereon, and the program instructions 31 are executed by a processor (not shown in the figure) to realize the battery deformation detection method in the above embodiments.

[0128] The computer readable storage medium 30 of the embodiment can be but is not limited to a storage unit in a U disk, an SD card, a PD optical drive, a mobile hard disk, a large-capacity floppy disk drive, a flash memory, a multimedia memory card, a server, an FPGA or an ASIC.

[0129] The application takes two positions of a target battery module of an initial shape of a symmetrical structure as a first detection point and a second detection point, respectively, first, takes the first detection point as a transmitting end to transmit an ultrasonic guided wave signal and takes the second detection point as a receiving end to receive a first propagation signal, second, takes the second detection point as a transmitting end to transmit an ultrasonic guided wave signal and takes the first detection point as a receiving end to receive a second propagation signal, and finally, compares the first propagation signal with the second propagation signal, since the first detection point and the second detection point are symmetrical points, if the target battery module does not deform, the shape is still the initial shape of a symmetrical structure, the propagation path of the first propagation signal is the same as that of the second propagation signal and the propagation direction is opposite, the similarity of the first propagation signal and the second propagation signal in signal characteristics is high, if the target battery module deforms and is no longer a symmetrical structure, the scattering or absorption of the ultrasonic guided wave signal occurs in the deformed and damaged part, so that the similarity of the first propagation signal and the second propagation signal in signal characteristics is low, therefore, based on the comparison result of the first propagation signal and the second propagation signal, whether the visible part and the invisible part of the target battery module exist deformation damage can be determined in a non-destructive manner, and deformation detection of the battery is realized.

[0130] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery shape change detection method, characterized by, Comprising: emitting an ultrasonic guided wave signal at a first detection point of a target battery module, and receiving a first propagation signal at a second detection point of the target battery module; wherein the first propagation signal is a signal formed after the ultrasonic guided wave signal emitted from the first detection point propagates in the target battery module; emitting the ultrasonic guided wave signal at the second detection point of the target battery module, and receiving a second propagation signal at the first detection point of the target battery module; wherein the second propagation signal is a signal formed after the ultrasonic guided wave signal emitted from the second detection point propagates in the target battery module; based on the first propagation signal and the second propagation signal, performing deformation detection on the target battery module; wherein the target battery module comprises one battery or at least two batteries connected to each other, and an initial shape of the target battery module is a symmetrical structure, and the first detection point and the second detection point are symmetrical points based on a symmetry axis of the symmetrical structure.

2. The battery shape change detection method of claim 1, wherein, The deformation detection on the target battery module based on the first propagation signal and the second propagation signal comprises: based on an energy value of a first difference signal obtained by subtracting the first propagation signal from the second propagation signal, performing deformation detection on the target battery module.

3. The battery shape change detection method of claim 2, wherein, The battery deformation detection method further comprises: emitting the ultrasonic guided wave signal at a third detection point of a reference battery module, and receiving a third propagation signal at a fourth detection point of the reference battery module; wherein the third propagation signal is a signal formed after the ultrasonic guided wave signal emitted from the third detection point propagates in the reference battery module; emitting the ultrasonic guided wave signal at the fourth detection point of the reference battery module, and receiving a fourth propagation signal at the third detection point of the reference battery module; wherein the fourth propagation signal is a signal formed after the ultrasonic guided wave signal emitted from the fourth detection point propagates in the reference battery module; wherein a shape of the reference battery module is the same as an initial shape of the target battery module, a relative position of the third detection point in the initial shape is the same as a relative position of the first detection point in the initial shape, and a relative position of the fourth detection point in the initial shape is the same as a relative position of the second detection point in the initial shape; The deformation detection on the target battery module based on the first difference signal obtained by subtracting the first propagation signal from the second propagation signal comprises: based on an energy value of a first difference signal obtained by subtracting the first propagation signal from the second propagation signal, and an energy value of a second difference signal obtained by subtracting the third propagation signal from the fourth propagation signal, performing deformation detection on the target battery module.

4. The battery shape change detection method of claim 3, wherein, The deformation detection on the target battery module based on the first difference signal obtained by subtracting the first propagation signal from the second propagation signal, and the energy value of the second difference signal obtained by subtracting the third propagation signal from the fourth propagation signal comprises: determining that the target battery module is deformed in response to a ratio of an energy value of the first difference signal divided by an energy value of the second difference signal being greater than or equal to a preset ratio threshold value; and / or, determining that the target battery module is not deformed in response to the ratio of the energy value of the first difference signal divided by the energy value of the second difference signal being less than the preset ratio threshold value.

5. The battery shape change detection method of claim 2, wherein, The first difference signal obtained by subtracting the second propagation signal from the first propagation signal is used for deformation detection of the target battery module, including: determining that the target battery module is deformed in response to the energy value of the first difference signal being greater than a preset energy value threshold value; and / or, determining that the target battery module is not deformed in response to the energy value of the first difference signal being less than or equal to the preset energy value threshold value.

6. The battery shape change detection method according to any one of claims 1 to 5, characterized by, The battery deformation detection method further includes: a plurality of candidate ultrasonic guided wave signals of different frequency parameters are sequentially emitted at a first detection point of a target battery module, and a plurality of candidate propagation signals corresponding to the plurality of candidate ultrasonic guided wave signals are received at a second detection point of the target battery module; one of the plurality of candidate propagation signals that meets a preset condition is determined as the ultrasonic guided wave signal.

7. The battery shape change detection method of claim 6, wherein, The preset condition includes an amplitude in a preset amplitude interval and a propagation time interval; The plurality of candidate propagation signals that meet the preset condition are determined as the ultrasonic guided wave signal, including: one of the plurality of candidate propagation signals that meets the preset condition is determined as the ultrasonic guided wave signal.

8. The battery shape change detection method according to any one of claims 1 to 5, characterized by, The first detection point is located at the positive electrode of the target battery module, and the second detection point is located at the negative electrode of the target battery module; or, The first detection point is located at the negative electrode of the target battery module, and the second detection point is located at the positive electrode of the target battery module.

9. A detection device, characterized in that including: a first signal generation unit for emitting an ultrasonic guided wave signal at a first detection point of a target battery module and receiving a first propagation signal at a second detection point of the target battery module; wherein the first propagation signal is a signal formed after the ultrasonic guided wave signal emitted from the first detection point propagates in the target battery module; a second signal generation unit for emitting the ultrasonic guided wave signal at the second detection point of the target battery module and receiving a second propagation signal at the first detection point of the target battery module; wherein the second propagation signal is a signal formed after the ultrasonic guided wave signal emitted from the second detection point propagates in the target battery module; a processing unit for performing deformation detection of the target battery module based on the first propagation signal and the second propagation signal; wherein the target battery module includes one battery or at least two batteries connected to each other, the initial shape of the target battery module is a symmetrical structure, and the first detection point and the second detection point are symmetrical points based on the symmetry axis of the symmetrical structure.

10. A detection device, characterized by including: a memory and a processor; the memory is configured to store program instructions, and the processor is configured to execute the program instructions to implement the method according to any one of claims 1 to 8.

11. A computer readable storage medium, characterized in that, the computer readable storage medium stores program instructions, and the program instructions, when executed by a processor, implement the method according to any one of claims 1 to 8.

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