Power battery defect detection method and detection system

Abstract

The invention belongs to the technical field of testing, and particularly relates to measurement of magnetic variables, in particular to a power battery defect detection method and system.The power battery defect detection method comprises the steps that a control module controls a first probe in the center of a probe array to work to send out an excitation signal so as to preliminarily scan a power battery; the initial position of the defect on the power battery is judged according to feedback signals of all probes in the probe array; the control module judges the probe closest to the defect according to the initial position of the defect, controls the probe to send out an excitation signal and receives a feedback signal to judge the type of the defect, so that the position of the defect is judged through cooperation of the probes, then one probe is closest to the position of the defect, and the type of the defect is recognized. And accurate detection of defects on the power battery is ensured.

Description

Technical Field

[0001] The present invention belongs to the field of testing technology, specifically relates to measuring magnetic variables, and more particularly to a power battery defect detection method and detection system. Background Art

[0002] During the production process of power batteries, they need to be inspected. In related technologies, power battery defects are detected by probes. However, the detection intensity decreases from the center to the outside of the detection range of the probe, and the location of the defect is random. The farther the defect is offset from the probe, the lower the detection intensity, resulting in the inability to determine whether there is a defect or the type of defect.

[0003] Therefore, due to the technical problem that during the power battery inspection process, the detection intensity of the probe decreases from the center to the outside, making it impossible to determine whether there are defects and the type of defects, it is necessary to design a power battery defect detection method and detection system.

[0004] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the Invention

[0005] The embodiments of the present disclosure at least provide a power battery defect detection method and detection system.

[0006] In a first aspect, an embodiment of the present disclosure provides a method for detecting defects in a power battery, comprising: The control module controls the first probe in the center of the probe array to send an excitation signal to perform a preliminary scan of the power battery, and determines the preliminary location of defects on the power battery based on the feedback signals of all probes in the probe array; The control module determines the probe closest to the defect based on the initial position of the defect, controls the probe to send an excitation signal and receives a feedback signal to determine the type of the defect.

[0007] In an optional embodiment, the probe array is arranged on a base, a first probe is arranged at the center of the base, a second probe, a third probe, a fourth probe and a fifth probe are respectively arranged around the first probe, and a straight line on which the second probe, the first probe and the fifth probe are located is perpendicular to a straight line on which the third probe, the fourth probe and the first probe are located; The method for determining a preliminary location of a defect on a power battery based on feedback signals from all probes in a probe array includes: the control module is configured to control the operation of the first probe, compare the difference between the excitation magnetic field intensity value emitted by the first probe and the received feedback magnetic field intensity value with a first preset value and a second preset value, and if the difference is less than the first preset value, determine that no defect is detected; if the difference is between the first preset value and the second preset value, determine that the defect is within a detection range surrounding a strongest detection range; if the difference is greater than the second preset value, determine that the defect is within the strongest detection range or that defects exist in both the strongest detection range and the surrounding detection range; When the first probe is working, the second probe, the third probe, the fourth probe and the fifth probe respectively feed back corresponding feedback magnetic field strength values, the difference between the feedback magnetic field strength value of the second probe and the feedback magnetic field strength value of the fifth probe is used as the second comparison value, and the difference between the feedback magnetic field strength value of the third probe and the feedback magnetic field strength value of the fourth probe is used as the third comparison value.

[0008] In an optional embodiment, the control module is configured such that when the defect exists within the strongest detection range or both the strongest detection range and the surrounding detection range, the second contrast value is outside the second threshold range and the third contrast value is within the third threshold range, the second contrast value is within the second threshold range and the third contrast value is outside the third threshold range, the second contrast value is outside the second threshold range and the third contrast value is outside the third threshold range, and the defect exists in multiple areas.

[0009] In an optional embodiment, the control module determines the probe closest to the defect based on the preliminary position of the defect, and controls the probe to send an excitation signal and receive a feedback signal to determine the type of the defect. The method includes: when the control module is configured to have a defect within the strongest detection range or both the strongest detection range and the surrounding detection range, the second comparison value is within the second threshold range and the third comparison value is within the third threshold range, and the feedback magnetic field strength values ​​corresponding to the second comparison value and the feedback magnetic field strength values ​​corresponding to the third comparison value are compared. If they are inconsistent, the defect exists in multiple areas; if they are consistent, it is determined that the defect exists within the strongest detection range of all probes or there is a defect between adjacent probes. At this time, any probe is switched to a working state, and the excitation magnetic field strength and feedback magnetic field strength of the probe are used to detect whether the defect exists within the strongest detection range of all probes. If it still cannot be detected, the base is rotated 45 degrees at will to confirm whether there is a defect between adjacent probes, and then it is confirmed that the defect is only within the strongest detection range. If the defect is only within the strongest detection range, obtain the corresponding impedance value to determine the defect type.

[0010] In an optional embodiment, the control module is configured so that when the defect exists only within the surrounding detection range, the second comparison value is outside the second threshold range, the third comparison value is within the third threshold range, and at the same time, the difference between the minimum value of each feedback magnetic field strength value corresponding to the second comparison value and the mean value of each feedback magnetic field strength value corresponding to the third comparison value does not exceed a third preset value, then the defect is closest to the second probe or the fifth probe, and the defect is judged to be closest to the second probe or the fifth probe by the size of the feedback magnetic field strength values ​​of the second probe and the fifth probe, and the impedance value is obtained by working with the second probe or the fifth probe closest to the defect to analyze the category of the defect.

[0011] In an optional embodiment, the control module is configured to, when the defect exists only within the surrounding detection range, if the second comparison value is outside the second threshold range, the third comparison value is within the third threshold range, and the difference between the minimum value of each feedback magnetic field intensity value corresponding to the second comparison value and the average value of each feedback magnetic field intensity value corresponding to the third comparison value exceeds a third preset value, then the defect exists in multiple regions; If the second comparison value is within the second threshold range and the third comparison value is outside the third threshold range, and the difference between the minimum value of each corresponding feedback magnetic field strength value in the third comparison value and the average value of each corresponding feedback magnetic field strength value in the second comparison value does not exceed the fourth preset value, then it is judged that the defect is closest to the third probe or the fourth probe, and the defect is judged to be closest to the third probe or the fourth probe based on the size of the feedback magnetic field strength values ​​of the third probe and the fourth probe. By working with the third probe or the fourth probe closest to the defect, the impedance value is obtained to analyze the category of the defect.

[0012] In an optional embodiment, the control module is configured to determine that the defect exists in multiple regions when the defect exists only within the surrounding detection range, the second comparison value is within the second threshold range, the third comparison value is outside the third threshold range, and the difference between the minimum value of each feedback magnetic field intensity value corresponding to the third comparison value and the average value of each feedback magnetic field intensity value corresponding to the second comparison value does not exceed a fourth preset value; When the defect exists only within the surrounding detection range, the second comparison value is outside the second threshold range and the third comparison value is outside the third threshold range, then the defect is located between adjacent probes, or the defect is simultaneously located in the strongest detection range of two adjacent probes, or the defect is simultaneously located in the strongest detection range of two adjacent probes and there is a defect between the two adjacent probes. The highest value of each feedback magnetic field intensity value corresponding to the second comparison value and the third comparison value is obtained respectively to determine the exact location of the defect; The control module is also configured to control the probe corresponding to the highest value of one of the feedback magnetic field strength values ​​to enter the active working state, and determine the rotation direction through the probe corresponding to the highest value of the other feedback magnetic field strength value. As the rotation occurs, the feedback magnetic field strength of the probe in the active working state gradually decreases, and the other set of comparison values ​​gradually decreases to approach 0 until the probe is closest to the defect position. At this time, the impedance value is obtained to analyze the category of the defect. If it does not meet the result that the feedback magnetic field strength of the probe gradually decreases and the other set of comparison values ​​gradually decreases to approach 0, then the defect exists in multiple areas.

[0013] In a second aspect, an embodiment of the present disclosure further provides a detection system using the above-mentioned power battery defect detection method, comprising: a scanning module configured to send an excitation signal through the first probe in the center of the probe array to perform a preliminary scan of the power battery and determine the preliminary location of defects on the power battery based on feedback signals from all probes in the probe array; The judgment module is configured to judge the probe closest to the defect according to the preliminary position of the defect, control the probe to send an excitation signal and receive a feedback signal to judge the type of the defect.

[0014] In a third aspect, an embodiment of the present disclosure further provides a computer-readable storage medium having a computer program / instruction stored thereon, which implements the steps of the above-mentioned power battery defect detection method when executed by a processor.

[0015] In a fourth aspect, an embodiment of the present disclosure further provides a program product comprising instructions, which, when executed by a device, causes the device to execute the steps of the above-mentioned power battery defect detection method.

[0016] The beneficial effect of the present invention is that the power battery defect detection method includes: controlling the first probe in the center of the probe array through the control module to send an excitation signal to perform a preliminary scan of the power battery, and judging the preliminary position of the defect on the power battery based on the feedback signals of all the probes in the probe array; judging the probe closest to the defect based on the preliminary position of the defect through the control module, controlling the probe to send an excitation signal and receiving a feedback signal to judge the type of the defect, thereby realizing the judgment of the position of the defect through the cooperation between the probes, and then making one of the probes closest to the defect position, thereby identifying the defect type, and ensuring accurate detection of defects on the power battery.

[0017] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are specifically cited herein and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A flowchart of a power battery defect detection method provided in an embodiment of the present disclosure; Figure 2 A schematic diagram of a probe array provided in an embodiment of the present disclosure; Figure 3 A schematic diagram showing a defect located in the strongest detection range provided by an embodiment of the present disclosure; Figure 4 A schematic diagram of a defect located between adjacent probes provided in an embodiment of the present disclosure.

[0021] In the picture: 1. First probe, 2. Second probe, 3. Third probe, 4. Fourth probe, 5. Fifth probe, 6. Base. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Thus, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations, aspects, or designs. Instead, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0024] During the power battery production process, they must be inspected. Related technologies use probes to detect power battery defects. However, the detection intensity decreases from the center of the probe's detection range outward, and the location of defects is random. The farther the defect is offset from the probe, the lower the detection intensity. This makes it difficult to determine the presence of defects or their type. Defects can include internal weld defects such as cracks, lack of fusion, incomplete penetration, single-point slag inclusions, and pores.

[0025] The defects in the above solutions are the results obtained by the inventors after practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed by the present disclosure in this article should be the contributions made by the inventors to the present disclosure during the disclosure process.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0027] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0028] like Figure 1 As shown, at least one disclosed embodiment provides a power battery defect detection method, including: controlling the first probe 1 in the center of the probe array through a control module to emit an excitation signal to perform a preliminary scan of the power battery, and judging the preliminary position of the defect on the power battery based on the feedback signals of all the probes in the probe array; judging the probe closest to the defect based on the preliminary position of the defect through the control module, controlling the probe to emit an excitation signal and receiving a feedback signal to judge the type of the defect, thereby realizing the judgment of the position of the defect through the cooperation between the probes, and then making one of the probes closest to the defect position, thereby identifying the defect type, and ensuring accurate detection of defects on the power battery.

[0029] In this embodiment, the probe array is set on the base 6, the base 6 is connected to a stepper motor, the control module is electrically connected to the stepper motor, the control module controls the stepper motor to drive the base 6 to rotate, thereby driving each probe on the base 6 to rotate, so that the probe can be rotated to the defect to facilitate the detection of the type of defect. The rotation direction is as follows: Figure 2 As shown in F.

[0030] In this embodiment, after determining the probe closest to the defect, only this probe is used to detect the type of defect. Compared with the traditional multi-probe synchronous detection, the operation of a single probe has no eddy current residue, which reduces magnetic field interference and increases detection accuracy.

[0031] In this embodiment, a plurality of probes are formed into an array, and each probe can be made smaller. The smaller probe can provide stronger magnetic field energy in a small range, thereby improving the detection accuracy.

[0032] like Figure 2 As shown, in an optional embodiment, the probe array is arranged on a base 6, a first probe 1 is arranged at the center of the base 6, and a second probe 2, a third probe 3, a fourth probe 4 and a fifth probe 5 are arranged around the first probe 1 respectively, and the straight line on which the second probe 2, the first probe 1 and the fifth probe 5 are located is perpendicular to the straight line on which the third probe 3, the fourth probe 4 and the first probe 1 are located; the method for determining the preliminary location of a defect on a power battery according to the feedback signals of all probes in the probe array includes: the control module is configured to control the operation of the first probe 1, and compare the difference between the excitation magnetic field intensity value emitted by the first probe 1 and the received feedback magnetic field intensity value with a first preset value and a second preset value. If the difference is less than the first preset value, it is determined that no defect is detected; if the difference is between the first preset value and the second preset value, it is determined that the defect is within the surrounding detection range of the strongest detection range; if the difference is greater than the second preset value, it is determined that the defect is within the strongest detection range or that there is a defect in both the strongest detection range and the surrounding detection range; Specifically, in actual use, a small probe is selected, the excitation magnetic field strength value can be 100mT, the feedback magnetic field strength is 95-98mT when there is no defect, the feedback magnetic field strength value is 80-95mT when the defect is within the surrounding detection range, and the feedback magnetic field strength value is below 80mT when the defect is within the strongest detection range. The first preset value is set to 5mT, and the second preset value is set to 20mT.

[0033] The strongest detection range refers to the detection range in which the probe can accurately identify defects, and the surrounding detection range refers to the detection range in which defects may not be accurately identified by the probe. The farther the defect is from the strongest detection range, the weaker the identification ability.

[0034] When the first probe 1 is working, the second probe 2, the third probe 3, the fourth probe 4 and the fifth probe 5 respectively feed back corresponding feedback magnetic field strength values, and the difference between the feedback magnetic field strength value of the second probe 2 and the feedback magnetic field strength value of the fifth probe 5 is used as the second comparison value, and the difference between the feedback magnetic field strength value of the third probe 3 and the feedback magnetic field strength value of the fourth probe 4 is used as the third comparison value.

[0035] In this embodiment, an excitation magnetic field is generated by the probe and feedback magnetic field strength is received. The more defects there are, the weaker the detected feedback magnetic field strength is and the greater the impedance value is.

[0036] In an optional embodiment, the control module is configured such that when the defect exists within the strongest detection range or both the strongest detection range and the surrounding detection range, the second contrast value is obvious and the third contrast value is not obvious, the second contrast value is not obvious and the third contrast value is obvious, or the second contrast value is obvious and the third contrast value is obvious, and the defect exists in multiple areas; when the second contrast value is within the second threshold range, the second contrast value is judged to be not obvious; when the second contrast value is outside the second threshold range, the second contrast value is judged to be obvious; when the third contrast value is within the third threshold range, the third contrast value is judged to be not obvious; and when the third contrast value is outside the third threshold range, the third contrast value is judged to be obvious.

[0037] Specifically, in actual use, the second threshold range can be set to -15 mT to 15 mT, and the third threshold range can be set to -15 mT to 15 mT.

[0038] like Figure 3 As shown, in an optional embodiment, the control module determines the probe closest to the defect based on the preliminary position of the defect, controls the probe to send an excitation signal and receives a feedback signal to determine the type of the defect. The method includes: the control module is configured to, when the defect is within the strongest detection range or exists in both the strongest detection range and the surrounding detection range, the second comparison value is not obvious and the third comparison value is not obvious, compare the feedback magnetic field strength values ​​corresponding to the second comparison value and the feedback magnetic field strength values ​​corresponding to the third comparison value, if they are inconsistent, the defect exists in multiple areas; if they are consistent, it is determined that the defect exists within the strongest detection range of all probes or there is a defect between adjacent probes, at this time any probe is switched to a working state, and the excitation magnetic field strength and feedback magnetic field strength of the probe are used to detect whether the defect exists within the strongest detection range of all probes, if it still cannot be detected, rotate the base 645 degrees arbitrarily to confirm whether there is a defect between adjacent probes, and then confirm that the defect is only within the strongest detection range; if the defect is only within the strongest detection range, obtain the corresponding impedance value to determine the defect category.

[0039] In an optional embodiment, the control module is configured so that when the defect exists only within the surrounding detection range, the second contrast value is obvious and the third contrast value is not obvious, and at the same time, the difference between the minimum value of each feedback magnetic field strength value corresponding to the second contrast value and the mean value of each feedback magnetic field strength value corresponding to the third contrast value does not exceed a third preset value, then the defect is closest to the second probe 2 or the fifth probe 5, and the defect is judged to be closest to the second probe 2 or the fifth probe 5 by the size of the feedback magnetic field strength values ​​of the second probe 2 and the fifth probe 5, and the impedance value is obtained by working with the second probe 2 or the fifth probe 5 closest to the defect to analyze the category of the defect.

[0040] In an optional embodiment, the control module is configured to, when the defect only exists within the surrounding detection range, if the second contrast value is obvious and the third contrast value is not obvious, and at the same time, the difference between the minimum value of each feedback magnetic field strength value corresponding to the second contrast value and the average value of each feedback magnetic field strength value corresponding to the third contrast value exceeds a third preset value, then the defect exists in multiple areas; if the second contrast value is not obvious and the third contrast value is obvious, and at the same time, the difference between the minimum value of each feedback magnetic field strength value corresponding to the third contrast value and the average value of each feedback magnetic field strength value corresponding to the second contrast value does not exceed a fourth preset value, then it is judged that the defect is closest to the third probe 3 or the fourth probe 4, and the defect is judged to be closest to the third probe 3 or the fourth probe 4 by the size of the feedback magnetic field strength values ​​of the third probe 3 and the fourth probe 4, and the impedance value is obtained by working with the third probe 3 or the fourth probe 4 closest to the defect to analyze the category of the defect.

[0041] like Figure 4 As shown, in an optional embodiment, the control module is configured to determine that the defect exists in multiple regions when the defect exists only in the surrounding detection range, the second comparison value is not obvious, the third comparison value is obvious, and at the same time, the difference between the minimum value of each feedback magnetic field intensity value corresponding to the third comparison value and the average value of each feedback magnetic field intensity value corresponding to the second comparison value does not exceed a fourth preset value; When the defect exists only within the surrounding detection range, and the second contrast value and the third contrast value are obvious, then the defect is located between adjacent probes, or the defect is simultaneously located in the strongest detection range of two adjacent probes, or the defect is simultaneously located in the strongest detection range of two adjacent probes and there is a defect between the two adjacent probes. The highest value of each feedback magnetic field intensity value corresponding to the second contrast value and the third contrast value is obtained respectively to determine the exact location of the defect; The control module is also configured to control the probe corresponding to the highest value of one of the feedback magnetic field strength values ​​to enter the active working state, and determine the rotation direction through the probe corresponding to the highest value of the other feedback magnetic field strength value. As the rotation occurs, the feedback magnetic field strength of the probe in the active working state gradually decreases, and the other set of comparison values ​​gradually decreases to approach 0 until the probe is closest to the defect position. At this time, the impedance value is obtained to analyze the category of the defect. If it does not meet the result that the feedback magnetic field strength of the probe gradually decreases and the other set of comparison values ​​gradually decreases to approach 0, then the defect exists in multiple areas.

[0042] In this embodiment, the defect is located between adjacent probes or the defect is simultaneously located in the strongest detection range of two adjacent probes or is simultaneously located in the strongest detection range of two adjacent probes and there is a defect between the two adjacent probes. It can be that the defect is located between the second probe 2 and the third probe 3, the second probe 2 and the fourth probe 4, the third probe 3 and the fifth probe 5, the fourth probe 4 and the fifth probe 5, or the defect is simultaneously located in the strongest detection range of two adjacent probes or is simultaneously located in the strongest detection range of two adjacent probes and there is a defect between the two adjacent probes.

[0043] In this embodiment, if there is a defect between the two probes, relying on a single probe may cause the probe to cover both defects simultaneously during rotation, which is also consistent with the gradual decrease in feedback magnetic field strength, leading to misjudgment. Therefore, it is necessary to make an accurate judgment based on the changes in the two sets of comparison values.

[0044] In this embodiment, when the defect exists only in the surrounding detection range, the second contrast value is not obvious and the third contrast value is not obvious, then the defect exists in multiple regions.

[0045] In this embodiment, when defects exist in multiple areas, the power battery is directly judged as unqualified.

[0046] In this embodiment, the difference between the excitation magnetic field strength value emitted by the working probe and the feedback magnetic field strength value is used as the first comparison value, and the impedance value of the excitation coil and the feedback coil in the probe is obtained in combination with the resistance, current, and voltage of the excitation coil and the feedback coil to determine the defect type.

[0047] In this embodiment, among the internal welding defects, cracks, lack of fusion, and incomplete penetration are "fatal" defects and must be 100% detected and repaired. Slag inclusions and pores can be allowed to exist in one place within a certain range but not in multiple places.

[0048] Specifically, in actual use, if the first comparison value is between 20mT and 25mT and the impedance value is almost unchanged, it is judged as a pore; if the first comparison value is between 25mT and 35mT and the impedance value fluctuates slightly, it is judged as a slag inclusion; if the first comparison value exceeds 35mT and the impedance value fluctuates greatly, it is judged as a fatal defect.

[0049] At least one other disclosed embodiment also provides a detection system using the above-mentioned power battery defect detection method, including: a scanning module, which is configured to send an excitation signal through the first probe 1 in the center of the probe array to perform a preliminary scan of the power battery, and judge the preliminary position of the defect on the power battery based on the feedback signals of all probes in the probe array; a judgment module, which is configured to judge the probe closest to the defect based on the preliminary position of the defect, control the probe to send an excitation signal and receive a feedback signal to judge the type of the defect.

[0050] In this embodiment, the aforementioned module may be a virtual module, whose functional steps are integrated into the control module. At least one other disclosed embodiment further provides a computer-readable storage medium having a computer program / instructions stored thereon, which, when executed by a processor, implements the steps of the aforementioned power battery defect detection method.

[0051] At least one other disclosed embodiment further provides a program product comprising instructions, which, when executed by a device, causes the device to perform the steps of the above-mentioned power battery defect detection method.

[0052] To summarize, the power battery defect detection method includes: controlling the first probe 1 in the center of the probe array through the control module to emit an excitation signal to perform a preliminary scan of the power battery, and judging the preliminary position of the defect on the power battery based on the feedback signals of all the probes in the probe array; judging the probe closest to the defect based on the preliminary position of the defect through the control module, controlling the probe to emit an excitation signal and receiving a feedback signal to judge the type of the defect, thereby realizing the judgment of the position of the defect through the cooperation between the probes, and then making one of the probes closest to the defect position, thereby identifying the defect type, and ensuring accurate detection of defects on the power battery.

[0053] The disclosure and other solutions, examples, embodiments, modules, and functional operations described in this document can be implemented in digital electronic circuitry, or in computer software, firmware, or hardware, including the structures disclosed in this document and their structural equivalents, or a combination of one or more thereof. The disclosure and other embodiments can be implemented as one or more computer program products, i.e., one or more modules of computer program instructions encoded on a tangible and non-volatile computer-readable medium, for execution by a data processing apparatus or to control the operation of the data processing apparatus. The computer-readable medium can be a machine-readable storage device, a machine-readable storage substrate, a storage device, a composition of matter that effects a machine-readable propagated signal, or a combination of any one or more thereof. In addition to hardware, the apparatus can also include code that creates an execution environment for a computer program, such as code constituting processor firmware, a protocol stack, a database management system, an operating system, or a combination of any one or more thereof. A propagated signal is an artificially generated signal, such as a machine-generated electrical, optical, or electromagnetic signal, that is generated to encode information for transmission to a suitable receiver device.

[0054] A computer program (also referred to as a program, software, software application, script, or code) may be written in any form of programming language (including compiled or interpreted languages) and may be deployed in any form, including as a standalone program or as a module, component, subroutine, or other unit suitable for use in a computing environment. A computer program does not necessarily correspond to a file in a file system. A program may be stored in a portion of a file that holds other programs or data (e.g., one or more scripts stored in a markup language document), in a single file dedicated to the program, or in multiple coordinated files (e.g., files storing one or more modules, subroutines, or portions of code). A computer program may be deployed for execution on one or more computers, located at one site or distributed across multiple sites and interconnected by a communications network.

[0055] The processes and logic flows described in this document can be performed by one or more programmable processors executing one or more computer programs to perform functions by operating on input data and generating output. The processes and logic flows can also be performed by, and apparatus can also be implemented as, special-purpose logic circuitry, e.g., an FPGA (field programmable gate array) or an ASIC (application-specific integrated circuit).

[0056] For example, processors suitable for executing computer programs include general-purpose and special-purpose microprocessors, as well as any one or more of any type of digital computer. Typically, a processor will receive instructions and data from read-only memory or random access memory, or both. The essential components of a computer are a processor that executes instructions and one or more memory devices that store instructions and data. Typically, a computer will also include one or more mass storage devices for storing data, such as magnetic, magneto-optical, or optical disks, or be operatively coupled to receive data from or transfer data to a mass storage device, or both. However, a computer need not have such devices. Computer-readable media suitable for storing computer program instructions and data include all forms of nonvolatile memory, media, and storage devices, including, for example, semiconductor memory devices, such as erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), and flash memory devices; magnetic disks, such as internal hard disks or removable disks; magneto-optical disks; and compact disk read-only memory (CD ROM) and digital versatile disk read-only memory (DVD-ROM) disks. The processor and memory may be supplemented by, or incorporated into, special-purpose logic circuitry.

[0057] Although several embodiments are provided in this disclosure, it should be understood that the disclosed systems and methods may be embodied in many other specific forms without departing from the spirit or scope of the present disclosure. The present examples are to be considered illustrative rather than restrictive, and the present invention is not to be construed as being limited to the details given. For example, various elements or components may be combined or integrated into another system, or certain features may be omitted or not implemented.

[0058] In the several embodiments provided herein, it should be understood that the disclosed devices and methods may also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions, and operations of the devices, methods, and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram may represent a module, program segment, or part of a code, which contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the boxes may also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, or they may sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, as well as the combination of boxes in the block diagram and / or flowchart, may be implemented using a dedicated hardware-based system that performs the specified functions or actions, or may be implemented using a combination of dedicated hardware and computer instructions.

[0059] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A power battery defect detection method, characterized in that: include: The control module controls the first probe (1) in the center of the probe array to emit an excitation signal to perform a preliminary scan of the power battery, and determines the preliminary location of defects on the power battery based on feedback signals from all probes in the probe array; The control module determines the probe closest to the defect based on the initial position of the defect, controls the probe to send an excitation signal and receives a feedback signal to determine the type of the defect.

2. The power battery defect detection method according to claim 1, wherein: The probe array is arranged on a base (6), a first probe (1) is arranged at the center of the base (6), a second probe (2), a third probe (3), a fourth probe (4) and a fifth probe (5) are arranged around the first probe (1), and a straight line on which the second probe (2), the first probe (1) and the fifth probe (5) are located is perpendicular to a straight line on which the third probe (3), the fourth probe (4) and the first probe (1) are located; The method for determining the preliminary location of a defect on a power battery based on feedback signals from all probes in a probe array includes: The control module is configured to control the operation of the first probe (1), compare the difference between the excitation magnetic field intensity value emitted by the first probe (1) and the received feedback magnetic field intensity value with a first preset value and a second preset value, and if the difference is less than the first preset value, it is determined that no defect is detected; if the difference is between the first preset value and the second preset value, it is determined that the defect is within the surrounding detection range of the strongest detection range; if the difference is greater than the second preset value, it is determined that the defect is within the strongest detection range or that defects exist in both the strongest detection range and the surrounding detection range; When the first probe (1) is working, the second probe (2), the third probe (3), the fourth probe (4) and the fifth probe (5) respectively feed back corresponding feedback magnetic field intensity values, the difference between the feedback magnetic field intensity value of the second probe (2) and the feedback magnetic field intensity value of the fifth probe (5) is used as the second comparison value, and the difference between the feedback magnetic field intensity value of the third probe (3) and the feedback magnetic field intensity value of the fourth probe (4) is used as the third comparison value.

3. The power battery defect detection method according to claim 2, wherein: The control module is configured such that when a defect exists within the strongest detection range or both the strongest detection range and the surrounding detection range, the second contrast value is outside the second threshold range and the third contrast value is within the third threshold range, the second contrast value is within the second threshold range and the third contrast value is outside the third threshold range, or the second contrast value is outside the second threshold range and the third contrast value is outside the third threshold range, then the defect exists in multiple areas.

4. The power battery defect detection method according to claim 3, wherein: The method in which the control module determines the probe closest to the defect based on the preliminary position of the defect, and controls the probe to send an excitation signal and receive a feedback signal to determine the type of the defect includes: The control module is configured to compare the feedback magnetic field strength values ​​corresponding to the second comparison value and the feedback magnetic field strength values ​​corresponding to the third comparison value when the defect exists within the strongest detection range or both the strongest detection range and the surrounding detection range, if they are inconsistent, the defect exists in multiple areas; if they are consistent, it is determined that the defect exists within the strongest detection range of all probes or between adjacent probes, at which time any probe is switched to a working state, and the excitation magnetic field strength and feedback magnetic field strength of the probe are used to detect whether the defect exists within the strongest detection range of all probes, if it still cannot be detected, the base (6) is rotated 45 degrees at random to confirm whether the defect exists between adjacent probes, and then confirm that the defect is only within the strongest detection range; If the defect is only within the strongest detection range, obtain the corresponding impedance value to determine the defect type.

5. The power battery defect detection method according to claim 3, wherein: The control module is configured such that when a defect exists only within the surrounding detection range, the second comparison value is outside the second threshold range, the third comparison value is within the third threshold range, and at the same time, the difference between the minimum value of each feedback magnetic field intensity value corresponding to the second comparison value and the mean value of each feedback magnetic field intensity value corresponding to the third comparison value does not exceed a third preset value, then the defect is closest to the second probe (2) or the fifth probe (5), and the defect is judged to be closest to the second probe (2) or the fifth probe (5) by the magnitude of the feedback magnetic field intensity values ​​of the second probe (2) and the fifth probe (5), and the impedance value is obtained by working with the second probe (2) or the fifth probe (5) closest to the defect to analyze the category of the defect.

6. The power battery defect detection method according to claim 3, wherein: The control module is configured to determine that, when the defect exists only within the surrounding detection range, if the second comparison value is outside the second threshold range, the third comparison value is within the third threshold range, and the difference between the minimum value of each feedback magnetic field intensity value corresponding to the second comparison value and the average value of each feedback magnetic field intensity value corresponding to the third comparison value exceeds a third preset value, then the defect exists in multiple regions; If the second comparison value is within the second threshold range and the third comparison value is outside the third threshold range, and the difference between the minimum value of each feedback magnetic field intensity value corresponding to the third comparison value and the mean value of each feedback magnetic field intensity value corresponding to the second comparison value does not exceed a fourth preset value, it is determined that the defect is closest to the third probe (3) or the fourth probe (4), and the defect is determined to be closest to the third probe (3) or the fourth probe (4) by the magnitude of the feedback magnetic field intensity values ​​of the third probe (3) and the fourth probe (4), and the impedance value is obtained by working with the third probe (3) or the fourth probe (4) closest to the defect to analyze the category of the defect.

7. The power battery defect detection method according to claim 3, wherein: The control module is configured to determine that the defect exists in multiple regions when the defect exists only within the surrounding detection range, the second comparison value is within the second threshold range, the third comparison value is outside the third threshold range, and the difference between the minimum value of each feedback magnetic field intensity value corresponding to the third comparison value and the average value of each feedback magnetic field intensity value corresponding to the second comparison value does not exceed a fourth preset value; When the defect exists only within the surrounding detection range, the second comparison value is outside the second threshold range and the third comparison value is outside the third threshold range, then the defect is located between adjacent probes, or the defect is simultaneously located in the strongest detection range of two adjacent probes, or the defect is simultaneously located in the strongest detection range of two adjacent probes and there is a defect between the two adjacent probes. The highest value of each feedback magnetic field intensity value corresponding to the second comparison value and the third comparison value is obtained respectively to determine the exact location of the defect; The control module is also configured to control the probe corresponding to the highest value of one of the feedback magnetic field strength values ​​to enter the active working state, and determine the rotation direction through the probe corresponding to the highest value of the other feedback magnetic field strength value. As the rotation occurs, the feedback magnetic field strength of the probe in the active working state gradually decreases, and the other set of comparison values ​​gradually decreases to approach 0 until the probe is closest to the defect position. At this time, the impedance value is obtained to analyze the category of the defect. If it does not meet the result that the feedback magnetic field strength of the probe gradually decreases and the other set of comparison values ​​gradually decreases to approach 0, then the defect exists in multiple areas.

8. A detection system using the power battery defect detection method according to claim 1, characterized in that: include: A scanning module is configured to send an excitation signal through a first probe (1) at the center of the probe array to perform a preliminary scan of the power battery, and to determine a preliminary location of a defect on the power battery based on feedback signals from all probes in the probe array; The judgment module is configured to judge the probe closest to the defect according to the preliminary position of the defect, control the probe to send an excitation signal and receive a feedback signal to judge the type of the defect.

9. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instruction is executed by a processor, the steps of the power battery defect detection method according to any one of claims 1 to 7 are implemented.

10. A program product comprising instructions, characterized in that When the instruction is executed by the device, the device executes the steps of the power battery defect detection method according to any one of claims 1 to 7.

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