Power battery detection method, system, probe mechanism and equipment

Abstract

The present invention belongs to the field of detection technology, and in particular relates to a detection method, system, probe mechanism and equipment for power batteries. The detection method for power batteries includes: a control module controls the probe mechanism to detect the welding position according to the shape of the welding position; a plurality of layers of detection coils are arranged in sequence from top to bottom to form the probe mechanism, wherein the detection coil of one layer is set separately, and the number of detection coils in the remaining layers is two, the center projections of all detection coils are on the same straight line, the detection ranges of the two detection coils on the same layer are respectively tangent to the detection range of the separately set detection coil, and the projections of the centers of the two detection coils on the same layer are located on both sides of the projections of the center of the separately set detection coil, thereby realizing the layered arrangement of the detection coils and reasonably setting the position of the detection coils to minimize the overlapping area of ​​the detection ranges of the detection coils, thereby realizing defect detection of the welding position at different depths and narrowing the range of defect detection in the area around the welding position.

Description

Technical Field

[0001] The present invention belongs to the field of detection technology, specifically to the field of online non-destructive flaw detection instruments, and in particular to a detection method, system, probe mechanism and equipment for power batteries. Background Art

[0002] During workpiece production, welding needs to be performed on the workpiece, and the welding position needs to be inspected after welding. However, when electromagnetic scanning is used to detect defects in the welding position, the detection range of the detection coil varies at different frequencies, resulting in the inability to effectively distinguish defect signals in the welding area from the non-welding area, resulting in a false detection rate of ≥20%.

[0003] Therefore, since the detection of defects at the welding position will be affected by defects in the surrounding area, it is necessary to design a detection method, system, probe mechanism and equipment for power batteries.

[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 detection method, system, probe mechanism and equipment for a power battery.

[0006] In a first aspect, an embodiment of the present disclosure provides a power battery detection method, comprising:

[0007] The control module obtains the detection range of the detection coil at different frequencies, and arranges the detection coil according to the detection range to form a probe mechanism;

[0008] The control module controls the probe mechanism to detect the welding position according to the shape of the welding position to determine the welding position condition;

[0009] The method of arranging the detection coils according to the detection range to form a probe mechanism includes:

[0010] At least two layers of detection coils are arranged in sequence above and below to form a probe mechanism, one of which has a single detection coil, and the remaining layers have two detection coils each. The frequencies of the detection coils in each layer are different, and the center projections of all detection coils are on the same straight line. The detection ranges of the two detection coils on the same layer are respectively tangent to the detection range of the single detection coil, and the projections of the centers of the two detection coils on the same layer are located on both sides of the projection of the center of the single detection coil.

[0011] In an optional embodiment, the method of obtaining the detection range of the detection coil at different frequencies by the control module includes:

[0012] Obtain a standard part, set a defect location point and an initial point on the top surface of the standard part, and set corresponding defect marks at different depths below the defect location point. The defect marks correspond to the detection depths of the detection coil at different frequencies.

[0013] The control module controls the first moving mechanism to drive the detection coil to move from the initial point to the defect location point, and controls the detection coil to operate at one of the frequencies. After the detection coil detects the defect mark, the distance between the center of the detection coil and the defect location point is the detection range corresponding to the detection coil at the frequency. Then, the detection range corresponding to other frequencies is obtained to obtain the detection range of the detection coil at different frequencies.

[0014] In an optional embodiment, the method of detecting the welding position by controlling the probe mechanism according to the shape of the welding position by the control module includes:

[0015] The control module determines the corresponding detection strategy according to the shape of the welding position. That is, when the shape of the welding position is point-shaped, the detection strategy is static detection by the probe; when the shape of the welding position is linear, the detection strategy is dynamic detection by the probe.

[0016] In an optional embodiment, the probe static detection includes:

[0017] The control module controls each detection coil to work in sequence, and the detection range of the individually set detection coil covers the welding position, and the detection values ​​of the two detection coils on the same layer are obtained respectively;

[0018] If the detection value of one of the two detection coils on the same layer is slightly abnormal, and the detection value of the other detection coil is normal, then there is no defect in the welding position, and the control module determines that the welding position is qualified and the workpiece is qualified at the frequency corresponding to the detection coil of this layer;

[0019] If the detection value of only one detection coil in the two detection coils on the same layer is seriously abnormal, the control module determines that the workpiece is unqualified at the frequency corresponding to the detection coil of this layer;

[0020] If the detection values ​​of the two detection coils in the same layer are both slightly abnormal, the control module controls the rotation mechanism to drive the probe mechanism to rotate one circle, and obtains the detection curves corresponding to the two detection coils in the same layer. If the detection values ​​in the two detection curves are always slightly abnormal, the control module determines that the welding position is unqualified but the workpiece is qualified under the corresponding frequency. If the detection value in any detection curve is normal, it is determined that the welding position and the workpiece are qualified;

[0021] If the detection values ​​of the two detection coils in the same layer are both severely abnormal, the control module controls the rotation mechanism to drive the probe mechanism to rotate one circle, and obtains the detection curves corresponding to the two detection coils in the same layer. If the detection values ​​in the two detection curves are always severely abnormal, the control module determines that the welding position is unqualified but the workpiece is qualified at the corresponding frequency. If the detection value in any detection curve is normal or slightly abnormal, the workpiece is judged to be unqualified;

[0022] When the detection value is within the first preset threshold, the detection value is normal; when the detection value is within the second preset threshold, the detection value is slightly abnormal; when the detection value is within the third preset threshold, the detection value is severely abnormal. The first preset threshold, the second preset threshold and the third preset threshold are continuous thresholds set in ascending order;

[0023] The welding position situation is that after all detection coils are working, if the control module judges that the workpiece is abnormal, the workpiece corresponding to the welding position currently being detected is abnormal. If the workpiece is normal but the welding position is unqualified, the welding position currently being detected is judged to be unqualified; otherwise, the welding position is judged to be qualified.

[0024] In an optional embodiment, the probe dynamic detection includes:

[0025] The control module controls each detection coil to work in sequence, and the detection range of the separately set detection coil covers the width range of the welding position. The probe mechanism is driven by the second moving mechanism to move repeatedly along the welding position. During one reciprocating process, the two detection coils on the same layer work at the same frequency respectively, and a detection curve corresponding to each position point on the welding position and the detection value is constructed. The two detection curves are compared. If the position points corresponding to the slightly abnormal detection values ​​in the two detection curves do not overlap, the control module determines that the welding position is qualified. If the position points corresponding to the slightly abnormal detection values ​​in the two detection curves overlap and the detection values ​​are consistent, the welding position is judged to be unqualified. If the detection values ​​are inconsistent, the workpiece is picked out, and the position point corresponding to the slightly abnormal detection value is located according to the detection curve, and the probe static detection is performed on the position point to determine the detection result corresponding to the position point.

[0026] The welding position situation is that after all detection coils are working, if the control module judges that the workpiece is abnormal, the workpiece corresponding to the welding position currently being detected is abnormal. If the workpiece is normal but the welding position is unqualified, the welding position currently being detected is judged to be unqualified; otherwise, the welding position is judged to be qualified.

[0027] In a second aspect, an embodiment of the present disclosure provides a power battery detection system, including:

[0028] a detection range determination module configured to obtain the detection range of the detection coil at different frequencies and arrange the detection coil according to the detection range to form a probe mechanism;

[0029] The detection module is configured to control the probe mechanism to detect the welding position according to the shape of the welding position to determine the condition of the welding position.

[0030] In a third aspect, an embodiment of the present disclosure provides a computer-readable storage medium having a computer program / instruction stored thereon. When the computer program / instruction is executed by a processor, the steps of the above-mentioned power battery detection method are implemented.

[0031] In a fourth aspect, an embodiment of the present disclosure 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 detection method.

[0032] In a fifth aspect, an embodiment of the present disclosure provides a probe mechanism for a power battery, wherein at least two layers of detection coils are sequentially arranged one above the other;

[0033] One layer of detection coils is set up individually, and the number of detection coils in the other layers is two. The frequencies of the detection coils in each layer are different. The center projections of all detection coils are on the same straight line. The detection ranges of the two detection coils on the same layer are respectively tangent to the detection range of the individually set detection coils, and the projections of the center projections of the two detection coils on the same layer are located on both sides of the projection of the center projection of the individually set detection coils.

[0034] The detection coils are all connected to switch modules to control the corresponding detection coils to be turned on or off.

[0035] In a sixth aspect, an embodiment of the present disclosure provides a power battery testing device, comprising: a control module, and a probe mechanism electrically connected to the control module;

[0036] The control module is configured to control the probe mechanism to detect the welding position using the above-mentioned detection method for the power battery to determine the welding position condition.

[0037] The beneficial effect of the present invention is that the detection method for a power battery includes: obtaining the detection range of the detection coil at different frequencies through a control module, arranging the detection coils according to the detection range to form a probe mechanism; controlling the probe mechanism according to the shape of the welding position through the control module to detect the welding position to determine the condition of the welding position; wherein the method of arranging the detection coils according to the detection range to form the probe mechanism includes: arranging at least two layers of detection coils in sequence from top to bottom to form the probe mechanism, wherein the detection coil of one layer is independently provided, and the number of detection coils in the remaining layers is two, the frequencies of the detection coils in each layer are different, the center projections of all the detection coils are on the same straight line, the detection ranges of the two detection coils in the same layer are respectively tangent to the detection range of the independently provided detection coil, and the projections of the centers of the two detection coils in the same layer are located on both sides of the projection of the center of the independently provided detection coil, thereby achieving layered arrangement of the detection coils and reasonably setting the positions of the detection coils to minimize the overlapping area of ​​the detection ranges of the detection coils, thereby achieving defect detection of the welding position at different depths and reducing the range of defect detection in the area surrounding the welding position, avoiding the influence of the area surrounding the welding position on the welding position detection, and ensuring accurate detection of the welding position.

[0038] 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.

[0039] 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

[0040] 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.

[0041] Figure 1 A flow chart of a power battery detection method provided in an embodiment of the present disclosure;

[0042] Figure 2 A schematic diagram of the position of a detection coil provided in an embodiment of the present disclosure;

[0043] Figure 3 A schematic diagram of a detection range provided in an embodiment of the present disclosure;

[0044] Figure 4A schematic diagram of defect location points and initial points provided in an embodiment of the present disclosure;

[0045] Figure 5 A schematic diagram of a detection coil circuit provided in an embodiment of the present disclosure;

[0046] Figure 6 A schematic structural diagram of the probe mechanism and the rotation mechanism provided in an embodiment of the present disclosure.

[0047] In the picture:

[0048] 1. Detection coil, 2. Standard component, 3. Probe mechanism, 4. Rotation mechanism. DETAILED DESCRIPTION

[0049] 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.

[0050] 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.

[0051] The detection coil has different sensitivities for detecting defects of different depths at different frequencies. Defects refer to impurities, particles, cracks, delamination, voids, bubbles, and pores. Therefore, the detection coil needs to detect defects of different depths at different frequencies. However, different frequencies will cause changes in the detection range. When the detection coil operates at high frequency, the detection range is small and the detection depth is shallow. As the detection coil frequency decreases, the detection range becomes larger and the detection depth becomes deeper, resulting in defects outside the detection range and being mistakenly believed to have defects at the welding location. However, some defects are within the acceptable range for the workpiece but unacceptable for the welding location. For example, impurities, particles, bubbles, etc. can appear in the workpiece, but appearing at the welding location will affect the welding effect. Although simulating the probe movement path can alleviate this problem to a certain extent, the inventors also found that the size of the welding location will change. Each time the welding location changes, the probe path needs to be recalculated, which is very complicated. At the same time, it requires the probe to move at the millimeter level, which is difficult to achieve. Even if different specifications of probes are used to make the detection range of each probe consistent by changing the diameter of the detection coil, the change in specifications will indirectly affect the detection depth, and then there is a problem of missing detection depth in a certain section.

[0052] 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.

[0053] 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 need to be further defined or explained in subsequent drawings.

[0054] 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 therein may be combined with each other.

[0055] like Figure 1 As shown, at least one disclosed embodiment provides a power battery detection method, including: obtaining, by a control module, a detection range of a detection coil 1 at different frequencies, and arranging the detection coil 1 according to the detection range to form a probe mechanism 3; controlling, by the control module, the probe mechanism 3 to detect the welding position according to the shape of the welding position to determine the welding position condition; wherein the method of arranging the detection coil 1 according to the detection range to form the probe mechanism 3 includes:

[0056] like Figure 2 and Figure 3As shown, at least two layers of detection coils 1 are arranged in sequence from top to bottom to form a probe mechanism 3, wherein the detection coils 1 of one layer are set separately, and the number of detection coils 1 in the remaining layers is two, and the frequencies of the detection coils 1 in each layer are different. The center projections of all detection coils 1 are on the same straight line, and the detection ranges of the two detection coils 1 in the same layer are respectively tangent to the detection range of the separately set detection coil 1, and the projections of the centers of the two detection coils 1 in the same layer are located on both sides of the projection of the center of the separately set detection coil 1, thereby realizing the layered arrangement of the detection coils 1 and reasonably setting the position of the detection coils 1 so that the overlapping area of ​​the detection range of each detection coil 1 is minimized, thereby realizing defect detection of the welding position at different depths and narrowing the range of defect detection in the area around the welding position, avoiding the influence of the area around the welding position on the welding position detection, and ensuring accurate detection of the welding position.

[0057] like Figure 2 and Figure 3 As shown, the circle range with the smallest line width corresponds to the detection range of the bottom detection coil 1, the range corresponding to the middle line width is the detection range corresponding to the second layer detection coil 2, and the range corresponding to the outermost line width is the detection range corresponding to the top layer detection coil 2.

[0058] In this embodiment, the distance between the projections of the centers of the two detection coils 1 on the same layer is the same as the distance between the projections of the center of a single detection coil 1 .

[0059] like Figure 2 and Figure 6 As shown, in this embodiment, the number of layers of detection coils 1 can be three, the bottom layer has one detection coil 1, and the remaining two layers have two detection coils 1. Specifically, the detection coils 1 can be set in the probe mechanism 3.

[0060] like Figure 4 As shown, in an optional embodiment, the method for obtaining the detection range of the detection coil 1 at different frequencies through the control module includes: obtaining a standard part 2, setting a defect positioning point and an initial point on the top surface of the standard part 2, and setting corresponding defect marks at different depth positions below the defect positioning point, and the defect marks correspond to the detection depths corresponding to the detection coil 1 at different frequencies; controlling the first moving mechanism through the control module to drive the detection coil 1 to move from the initial point to the defect positioning point, and controlling the detection coil 1 to operate at one of the frequencies. After the detection coil 1 detects the defect mark, the distance between the center of the detection coil 1 and the defect positioning point is the detection range corresponding to the detection coil 1 at the frequency, and then obtaining the detection ranges corresponding to other frequencies to obtain the detection range of the detection coil 1 at different frequencies.

[0061] In this embodiment, the standard component 2 is used to determine the detection range of the detection coil 1 at each frequency. The standard component 2 can be manufactured according to the shape and material of the workpiece currently required to be detected.

[0062] In this embodiment, the first moving mechanism may be a linear moving pair, etc., to drive the detection coil 1 to move from the initial point to the defect location point.

[0063] In this embodiment, the initial point is A, the defect positioning point is a1, and corresponding defect marks a2, a3, and a4 are set at different depths below the defect positioning point. Each defect mark can correspond to a different frequency. Defect mark a2 can be detected when the detection frequency is maximum, and defect mark a4 can be detected when the detection frequency is minimum. Each detection frequency is more sensitive to the detection of defect marks at the corresponding depth, and is insensitive to defect marks at other depths, and defect marks at other depths cannot be detected.

[0064] In this embodiment, r1 is the radius of the detection range when the detection coil 1 operates at the maximum power corresponding to the three defect marks a2, a3, and a4, r3 is the radius of the detection range when the detection coil 1 operates at the minimum power corresponding to the three defect marks a2, a3, and a4, and r2 is the radius of the detection range when the detection coil 1 operates at the intermediate power corresponding to the three defect marks a2, a3, and a4.

[0065] In an optional embodiment, the method of controlling the probe mechanism 3 to detect the welding position according to the shape of the welding position through the control module includes: the control module determines the corresponding detection strategy according to the shape of the welding position, that is, when the shape of the welding position is point-shaped, its detection strategy is static detection of the probe, and when the shape of the welding position is linear, its detection strategy is dynamic detection of the probe.

[0066] In this embodiment, an adaptive detection strategy is selected according to the shape of different welding positions, that is, the shape of the weld spot, so that the welding position can be detected more accurately and a more accurate welding position detection situation can be obtained; for example, when the welding position shape is a circle with a diameter of ≤3mm, it is judged to be point-shaped, and when it is a continuous weld with a length of ≥5mm and a width of ≤2mm, it is judged to be linear.

[0067] In this embodiment, the welding position defect judgment criteria combined with probe static detection and probe dynamic detection can realize defect judgment of the welding position and defects around the welding position, and then screen out qualified workpieces, unqualified workpieces, and whether the welding position is qualified.

[0068] In an optional embodiment, the probe static detection includes: the control module controls each detection coil 1 to work in sequence, the detection range of the separately set detection coil 1 covers the welding position, and the detection values ​​of the two detection coils 1 on the same layer are respectively obtained;

[0069] If the detection value of one detection coil 1 of the two detection coils 1 on the same layer is slightly abnormal, and the detection value of the other detection coil 1 is normal, then there is no defect in the welding position, and the control module determines that the welding position is qualified and the workpiece is qualified at the frequency corresponding to the detection coil 1 of this layer;

[0070] If the detection value of only one detection coil 1 among the two detection coils 1 on the same layer is severely abnormal, the control module determines that the workpiece is unqualified at the frequency corresponding to the detection coil 1 of this layer;

[0071] If the detection values ​​of the two detection coils 1 in the same layer are both slightly abnormal, the control module controls the rotation mechanism 4 to drive the probe mechanism 3 to rotate one circle, and obtains the detection curves corresponding to the two detection coils 1 in the same layer. If the detection values ​​in the two detection curves are always slightly abnormal, the control module determines that the welding position is unqualified but the workpiece is qualified under the corresponding frequency. If the detection value in any detection curve is normal, it is determined that the welding position and the workpiece are qualified;

[0072] If the detection values ​​of the two detection coils 1 on the same layer are both severely abnormal, the control module controls the rotation mechanism 4 to drive the probe mechanism 3 to rotate one circle, and obtains the detection curves corresponding to the two detection coils 1 on the same layer. If the detection values ​​in the two detection curves are always severely abnormal, the control module determines that the welding position is unqualified but the workpiece is qualified at the corresponding frequency. If the detection value in any detection curve is normal or slightly abnormal, the workpiece is judged to be unqualified;

[0073] When the detection value is within the first preset threshold, the detection value is normal; when the detection value is within the second preset threshold, the detection value is slightly abnormal; when the detection value is within the third preset threshold, the detection value is severely abnormal. The first preset threshold, the second preset threshold and the third preset threshold are continuous thresholds set in ascending order;

[0074] The welding position situation is that after all detection coils 1 are working, if the control module judges that the workpiece is abnormal, the workpiece corresponding to the welding position currently being detected is abnormal. If the workpiece is normal but the welding position is unqualified, the welding position currently being detected is judged to be unqualified, otherwise the welding position is judged to be qualified.

[0075] In this embodiment, the detection value is the amplitude of the feedback magnetic field signal, which can determine whether there is a defect, and different thresholds correspond to different defects.

[0076] In this embodiment, the rotating mechanism 4 may be a rotary motor, for example, a high-precision rotary motor (with a repeatability accuracy of ±0.01 mm, such as Harmonic Drive CSF-17-100), and the acquisition frequency during rotation detection is ≥1000 Hz.

[0077] In this embodiment, the tail end of the first threshold is connected to the beginning of the second threshold, and the tail end of the second threshold is connected to the beginning of the third threshold. The first threshold range includes the values ​​at both ends, the third threshold range includes the values ​​at both ends, and the second threshold range does not include the values ​​at both ends.

[0078] In this embodiment, the first preset threshold value is -5% to 5% of the detection value of the standard part in a non-defective state, the second preset threshold value is -10% to -5% and 5% to 10% of the detection value of the standard part in a mild defective state, and the third preset threshold value is below -10% and above 10% of the detection value of the standard part in a severe defective state; the specific range can be adjusted according to the specific situation.

[0079] In this embodiment, the defects corresponding to mild abnormalities may be impurities, particles, and bubbles, which are acceptable for the workpiece but unacceptable for welding; the defects corresponding to mild abnormalities may be cracks, delamination, voids, and pores, which are unacceptable for both the workpiece and welding.

[0080] In an optional embodiment, the dynamic detection of the probe includes: a control module controls each detection coil 1 to work in sequence, and the detection range of the separately set detection coil 1 covers the width range of the welding position, and the probe mechanism 3 is driven to move repeatedly along the welding position by the second moving mechanism. During a reciprocating process, the two detection coils 1 on the same layer work at the same frequency respectively, and a detection curve corresponding to each position point on the welding position and the detection value is constructed, and the two detection curves are compared. If the position points corresponding to the slightly abnormal detection values ​​in the two detection curves do not overlap, the control module determines that the welding position is qualified. If the position points corresponding to the slightly abnormal detection values ​​in the two detection curves overlap and the detection values ​​are consistent, the welding position is judged to be unqualified. If the detection values ​​are inconsistent, the workpiece is picked out, and the position point corresponding to the slightly abnormal detection value is located according to the detection curve, and the probe static detection is performed on the position point to determine the detection result corresponding to the position point.

[0081] The welding position situation is that after all detection coils 1 are working, if the control module judges that the workpiece is abnormal, the workpiece corresponding to the welding position currently being detected is abnormal. If the workpiece is normal but the welding position is unqualified, the welding position currently being detected is judged to be unqualified, otherwise the welding position is judged to be qualified.

[0082] In this embodiment, the second moving mechanism may be, but is not limited to, a three-axis moving pair.

[0083] In this embodiment, the detection value is affected by the specific circuit, so each threshold value can be flexibly adjusted according to the specific situation.

[0084] like Figure 5As shown, in this embodiment, the traditional probe adopts a non-physical switching method to control the operation of one or more detection coils 1. If there is residual eddy current in the detection coil 1, it will affect the detection result. Therefore, each detection coil 1 adopts a physical contact (switch module SW1) switching method, that is, each detection coil 1 is connected to a separate switch module SW1 to overcome the residual eddy current in the detection coil 1. ECC1 is the detection coil 1. A power resistor R1 is connected between the detection coil 1 and the physical contact, which can quickly absorb the residual eddy current. At the same time, SW1 is a physical contact to realize physical circuit disconnection. The J1 end is connected to the detector and the peripheral circuit. The detector receives the electromagnetic signal emitted by the detection coil 1 to obtain the corresponding detection value. R2 is the detection resistor, which is connected between the power resistor R1 and the detection coil 1 to detect whether there is residual eddy current in the detection circuit. J2 is connected to the peripheral detection circuit, as well as the control module, etc. The detector can also be connected to the control module, etc.

[0085] At least one other disclosed embodiment is a detection system for a power battery, comprising: a detection range determination module, which is configured to obtain the detection range of the detection coil 1 at different frequencies, and arrange the detection coil 1 according to the detection range to form a probe mechanism 3; a detection module, which is configured to control the probe mechanism 3 to detect the welding position according to the shape of the welding position to determine the condition of the welding position.

[0086] In this embodiment, the above modules may be virtual modules, whose functional steps are integrated into the control module.

[0087] At least one other disclosed embodiment provides a computer-readable storage medium having a computer program / instruction stored thereon, which implements the steps of the above-mentioned power battery detection method when executed by a processor.

[0088] At least one other disclosed embodiment provides a program product comprising instructions, which, when executed by a device, causes the device to perform the steps of the above-described power battery detection method.

[0089] At least one other disclosed embodiment is a probe mechanism 3 for a power battery, in which at least two layers of detection coils 1 are arranged in sequence one above the other; the detection coils 1 of one layer are arranged separately, and the number of detection coils 1 in the remaining layers is two, the frequency of the detection coils 1 in each layer is different, the center projections of all detection coils 1 are on the same straight line, the detection ranges of the two detection coils 1 on the same layer are respectively tangent to the detection range of the separately arranged detection coil 1, and the projections of the centers of the two detection coils 1 on the same layer are located on both sides of the projection of the center of the separately arranged detection coil 1; the detection coils 1 are all connected to a switch module to control the corresponding detection coil 1 to be turned on or off through the switch module.

[0090] At least one other disclosed embodiment is a power battery detection device, comprising: a control module, and a probe mechanism 3 electrically connected to the control module; the control module is configured to use the above-mentioned power battery detection method to control the probe mechanism 3 to detect the welding position to determine the welding position condition.

[0091] In summary, the detection method for power batteries includes: obtaining the detection range of the detection coil 1 at different frequencies through the control module, and arranging the detection coil 1 according to the detection range to form a probe mechanism 3; controlling the probe mechanism 3 to detect the welding position according to the shape of the welding position through the control module to determine the welding position condition; wherein the method of arranging the detection coil 1 according to the detection range to form the probe mechanism 3 includes: arranging at least two layers of detection coils 1 in sequence from top to bottom to form the probe mechanism 3, wherein the detection coil 1 of one layer is set separately, and the number of detection coils 1 in the remaining layers is two, and the frequency of the detection coils 1 of each layer is different, The center projections of all detection coils 1 are on the same straight line, the detection ranges of the two detection coils 1 on the same layer are respectively tangent to the detection range of the individually set detection coil 1, and the projections of the center points of the two detection coils 1 on the same layer are located on both sides of the projection of the center point of the individually set detection coil 1, thereby realizing the layered arrangement of the detection coils 1 and reasonably setting the position of the detection coils 1 to minimize the overlapping area of ​​the detection ranges of the detection coils 1, thereby realizing defect detection of the welding position at different depths and narrowing the range of defect detection in the area around the welding position, avoiding the influence of the area around the welding position on the welding position detection, and ensuring accurate detection of the welding position.

[0092] 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.

[0093] 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.

[0094] 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).

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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 detection method for a power battery, characterized in that: include: The detection range of the detection coil (1) at different frequencies is obtained through a control module, and the detection coil (1) is arranged according to the detection range to form a probe mechanism (3); The control module controls the probe mechanism (3) to detect the welding position according to the shape of the welding position, so as to determine the welding position condition; in The method of arranging the detection coil (1) according to the detection range to form a probe mechanism (3) comprises: At least two layers of detection coils (1) are sequentially arranged above and below to form a probe mechanism (3), wherein the detection coil (1) of one layer is individually arranged, and the number of detection coils (1) of the remaining layers is two, and the frequency of each layer of detection coils (1) is different. The center projections of all detection coils (1) are on the same straight line, and the detection ranges of the two detection coils (1) on the same layer are respectively arranged to intersect with the detection range of the individually arranged detection coil (1), and the projections of the centers of the two detection coils (1) on the same layer are located on both sides of the projection of the center of the individually arranged detection coil (1); The method for detecting the welding position by controlling the probe mechanism (3) according to the shape of the welding position by the control module comprises: The control module determines the corresponding detection strategy according to the shape of the welding position. That is, when the welding position shape is point-shaped, its detection strategy is static detection of the probe; when the welding position shape is linear, its detection strategy is dynamic detection of the probe; The probe static detection includes: The control module controls each detection coil (1) to work in sequence, and the detection range of the individually set detection coil (1) covers the welding position, and the detection values ​​of the two detection coils (1) on the same layer are respectively obtained; If the detection value of one detection coil (1) of the two detection coils (1) on the same layer is slightly abnormal and the detection value of the other detection coil (1) is normal, then there is no defect in the welding position, and the control module determines that the welding position is qualified and the workpiece is qualified at the frequency corresponding to the detection coil (1) of the layer; If the detection value of only one detection coil (1) among the two detection coils (1) on the same layer is severely abnormal, the control module determines that the workpiece is unqualified at the frequency corresponding to the detection coil (1) on the layer; If the detection values ​​of the two detection coils (1) in the same layer are both slightly abnormal, the control module controls the rotating mechanism (4) to drive the probe mechanism (3) to rotate one circle, and obtains the detection curves corresponding to the two detection coils (1) in the same layer. If the detection values ​​in the two detection curves are always slightly abnormal, the control module determines that the welding position is unqualified but the workpiece is qualified under the corresponding frequency. If the detection value in any detection curve is normal, the control module determines that the welding position is qualified and the workpiece is qualified. If the detection values ​​of the two detection coils (1) in the same layer are both severely abnormal, the control module controls the rotation mechanism (4) to drive the probe mechanism (3) to rotate one circle, and obtains the detection curves corresponding to the two detection coils (1) in the same layer. If the detection values ​​in the two detection curves are always severely abnormal, the control module determines that the welding position is unqualified but the workpiece is qualified under the corresponding frequency. If the detection value in any detection curve is normal or slightly abnormal, the workpiece is determined to be unqualified. When the detection value is within the first preset threshold, the detection value is normal; when the detection value is within the second preset threshold, the detection value is slightly abnormal; when the detection value is within the third preset threshold, the detection value is severely abnormal. The first preset threshold, the second preset threshold and the third preset threshold are continuous thresholds set in ascending order; The welding position situation is that after all the detection coils (1) are working, if the control module determines that the workpiece is abnormal, the workpiece corresponding to the welding position currently being detected is abnormal; if the workpiece is normal but the welding position is unqualified, the welding position currently being detected is judged to be unqualified; otherwise, the welding position is judged to be qualified.

2. The power battery detection method according to claim 1, wherein: The method for obtaining the detection range of the detection coil (1) at different frequencies by the control module comprises: Obtain a standard part (2), set a defect location point and an initial point on the top surface of the standard part (2), and set corresponding defect marks at different depths below the defect location point, wherein the defect marks correspond to the detection depths corresponding to the detection coil (1) at different frequencies; The control module controls the first moving mechanism to drive the detection coil (1) to move from the initial point to the defect positioning point, and controls the detection coil (1) to operate at one of the frequencies. After the detection coil (1) detects the defect mark, the distance between the center of the detection coil (1) and the defect positioning point is the detection range corresponding to the detection coil (1) at the frequency. Then, the detection range corresponding to other frequencies is obtained to obtain the detection range of the detection coil (1) at different frequencies.

3. The power battery detection method according to claim 1, wherein: The probe dynamic detection includes: The control module controls each detection coil (1) to work in sequence, and the detection range of the individually set detection coil (1) covers the width range of the welding position. The second moving mechanism drives the probe mechanism (3) to move repeatedly along the welding position. In one reciprocating process, the two detection coils (1) on the same layer work at the same frequency respectively, and construct a detection curve corresponding to each position point on the welding position and the detection value. The two detection curves are compared. If the position points corresponding to the slightly abnormal detection values ​​in the two detection curves do not overlap, the control module determines that the welding position is qualified. If the position points corresponding to the slightly abnormal detection values ​​in the two detection curves overlap and the detection values ​​are consistent, the welding position is determined to be unqualified. If the detection values ​​are inconsistent, the workpiece is picked out, and the position point corresponding to the slightly abnormal detection value is located according to the detection curve, and the probe static detection is performed on the position point to determine the detection result corresponding to the position point. The welding position situation is that after all the detection coils (1) are working, if the control module determines that the workpiece is abnormal, the workpiece corresponding to the welding position currently being detected is abnormal; if the workpiece is normal but the welding position is unqualified, the welding position currently being detected is judged to be unqualified; otherwise, the welding position is judged to be qualified.

4. A power battery detection system using the power battery detection method according to any one of claims 1 to 3, characterized in that: include: A detection range determination module is configured to obtain the detection range of the detection coil (1) at different frequencies, and arrange the detection coil (1) according to the detection range to form a probe mechanism (3); The detection module is configured to control the probe mechanism (3) to detect the welding position according to the shape of the welding position, so as to determine the welding position condition.

5. 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 detection method according to any one of claims 1 to 3 are implemented.

6. 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 detection method according to any one of claims 1 to 3.

7. A power battery probe mechanism using the power battery detection method according to any one of claims 1 to 3, characterized in that: At least two layers of detection coils (1) are arranged in sequence above and below; The detection coils (1) of one layer are individually provided, and the number of the detection coils (1) of the other layers are two each. The frequencies of the detection coils (1) of each layer are different. The center projections of all the detection coils (1) are on the same straight line. The detection ranges of the two detection coils (1) on the same layer are respectively intersected with the detection range of the individually provided detection coil (1), and the projections of the center of the two detection coils (1) on the same layer are located on both sides of the projection of the center of the individually provided detection coil (1). The detection coils (1) are all connected to a switch module, so as to control the corresponding detection coils (1) to be turned on or off through the switch module.

8. A power battery testing device, characterized in that: include: A control module, and a probe mechanism (3) electrically connected to the control module; The control module is configured to control the probe mechanism (3) to detect the welding position using the power battery detection method according to any one of claims 1 to 3, so as to determine the welding position condition.

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