Battery FFC (Flexible Flat Cable) detection equipment and detection method

Abstract

The invention relates to the technical field of FFC (Flexible Flat Cable) detection, and discloses battery FFC detection equipment, which comprises a shielding box, a magnetic field construction part, a movement mechanism, a temperature field construction part, a standard single-core wire, a current metering part and a temperature metering part. The detection method comprises the following steps: S1, the battery FFC and the standard single-core wire do longitudinal reciprocating motion in a set magnetic field, S2, current curves are recorded, and S3, the current curves are compared to judge whether the battery FFC is qualified or not. According to the battery FFC flat cable detection equipment and the detection method provided by the invention, the detection result is more accurate and reliable, and the battery FFC is graded according to the detection result so as to be suitable for different batteries.

Description

Technical Field

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

[0002] Currently, FPC (Flexible Printed Circuit) in new energy vehicle power battery packs is widely used, and the battery FFC (Flat Flexible Cable) in it is one of the important components connecting battery modules. With the development of the new energy vehicle market, the requirements for battery FFC cables are getting higher and higher, and strict screening is required during the production process.

[0003] The existing battery FFC cable detection methods mainly include visual inspection, resistance testing, and voltage testing. However, the above methods can only detect some fault types and have low detection efficiency, and cannot determine the performance level of the battery FFC cable.

[0004] Therefore, there is a defect in the prior art: the existing battery FFC cable detection methods cannot comprehensively detect all fault types of the battery FFC cable and cannot determine the performance level of the battery FFC cable. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art. To solve or at least mitigate the above problems, a battery FFC cable detection device and a detection method are provided.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A battery FFC cable detection device, comprising: A shielding box; A magnetic field construction unit, which is used to construct a set magnetic field in the middle of the shielding box; A motion mechanism, which is used to drive the battery FFC cable to reciprocate longitudinally in the set magnetic field; A temperature field construction unit, which is used to construct a temperature field with a set temperature in the shielding box; A standard single-core wire, which is used for detection comparison, and the specification of the standard single-core wire is the same as that of the branch line of the battery FFC cable and is arranged in parallel on one side of the battery FFC cable; A current measurement unit, which is used to detect the current of each branch line of the battery FFC cable and the standard single-core wire; A temperature measurement unit, which is used to detect the temperature at each place of the battery FFC cable.

[0007] Further, the magnetic field construction unit is an electromagnetic coil.

[0008] The present invention also discloses a method for detecting a battery FFC cable, which is used for a battery FFC cable detection device as described above, and includes the following steps: S1. The motion mechanism drives the middle parts of the battery FFC cable and the standard single-core wire to reciprocate longitudinally within a set magnetic field; S2. Record the current curves of each branch of the standard single-core wire and the battery FFC cable; S3. Compare the current curves of each branch of the battery FFC cable with the current curve of the standard single-core wire to determine whether the battery FFC cable is qualified.

[0009] Further, the step S3 includes the following steps: S31. The degree of change in the peak of the current curve and the rate of change in fluctuations; S32. When the degree of change in the peak is less than the first peak threshold and the rate of change in fluctuations is less than the first fluctuation threshold, the battery FFC cable is determined to be a qualified product; S33. When the degree of change in the peak is greater than the second peak threshold or the rate of change in fluctuations is greater than the second fluctuation threshold, the battery FFC cable is determined to be a non-qualified product.

[0010] Further, the step S3 also includes the following steps: S34. When the degree of change in the peak is less than the second peak threshold and greater than the first peak threshold, it is determined that there is a conductor break, and go to step S35; S35. Increase the movement amplitude of the motion mechanism and enter step S2; S36. After secondary detection, when the degree of change in the peak is less than the second peak threshold and greater than the first peak threshold, the battery FFC cable is determined to be a defective product.

[0011] Further, the step S3 also includes the following steps: S37. When the rate of change in fluctuations is less than the second fluctuation threshold and greater than the first fluctuation threshold, it is determined that there is insulation damage, and go to step S38; S38. Reduce the movement frequency of the motion mechanism and enter step S2; S39. After secondary detection, when the rate of change in fluctuations is less than the second fluctuation threshold and greater than the first fluctuation threshold, the battery FFC cable is determined to be a defective product.

[0012] Further, it also includes the following steps: S4. Continuously reciprocate the qualified products and defective products, and gradually increase the temperature of the detection environment; S5. Detect the temperature rise rate of the standard single-core wire and the temperature rise rate of each part of the FFC cable; S6. Compare the temperature rise rate of each part of the FFC cable with the temperature rise rate of the standard single-core wire, classify the battery FFC cable and determine the non-qualified products.

[0013] Further, the step S6 includes the following steps: S61, when the temperature rise rate is less than the first temperature rise threshold, enter step S62; S62, when the battery FFC cable is a qualified product, the battery FFC cable is a first-class product; when the battery FFC cable is a defective product, the battery FFC cable is a second-class product; S63, when the temperature rise rate is greater than the first temperature rise threshold and less than the second temperature rise threshold, enter step S64; S64, when the battery FFC cable is a qualified product, the battery FFC cable is a second-class product; when the battery FFC cable is a defective product, the battery FFC cable is a non-conforming product; S65, when the temperature rise rate is greater than the second temperature rise threshold, the battery FFC cable is a non-conforming product.

[0014] Further, the following steps are also included: S7. Continuously reciprocate the first-class products and second-class products, detect the environmental temperature rise to the actual working temperature of the battery FFC cable, and maintain for a set duration; S8. Record the current curves of each branch of the battery FFC cable at the actual working temperature; S9. Compare the current curves of each branch of the battery FFC cable at room temperature with the current curves of each branch of the battery FFC cable at the actual working temperature, and classify the battery FFC cable.

[0015] Further, the step S9 includes the following steps: S91, when the current difference rate is less than the difference rate threshold, enter step S92; S92, when the battery FFC cable is a first-class product, the battery FFC cable is an A-level product; when the battery FFC cable is a second-class product, the battery FFC cable is a B-level product; S93, when the current difference rate is greater than the difference rate threshold, enter step S94; S94, when the battery FFC cable is a first-class product, the battery FFC cable is a B-level product; when the battery FFC cable is a second-class product, the battery FFC cable is a C-level product.

[0016] The beneficial effects of the present invention are: Applying the technical solution of the present invention, a set magnetic field is constructed in the middle of the shielding box by the magnetic field construction part, and then the battery FFC cable is driven by the moving mechanism to reciprocate longitudinally in the set magnetic field. Due to the action of magnetic force, an eddy current effect is generated in the battery FFC cable, so that it can quickly and accurately detect whether there is an open circuit or a short circuit in the battery FFC cable, and then realize the quality control of the battery FFC cable. At the same time, by setting a standard single-core wire as a detection comparison, the detection result can be made more accurate and reliable, and the situation of misjudgment can be avoided. In addition, the present application can also use the temperature field construction part to construct a temperature field with a set temperature in the shielding box, so that the battery FFC cable can be tested in a high-temperature environment, thus simulating a real working scenario and improving the accuracy of the detection result.

[0017] The present invention gradually classifies the battery FFC according to the detection results to be applicable to different batteries, and also improves the detection efficiency. Brief Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the detection device of the present invention.

[0019] Figure 2 It is one of the step flowcharts of the detection method of the present invention.

[0020] Figure 3 It is the second of the step flowcharts of the detection method of the present invention.

[0021] Figure 4 It is the third of the step flowcharts of the detection method of the present invention.

[0022] The reference numerals are: 1 - shielding box; 2 - magnetic field construction part; 3 - moving mechanism. Detailed Description of the Invention

[0023] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present invention.

[0025] Embodiment 1 As Figure 1 shown, the product provided by the embodiment of the present invention is a battery FFC cable detection device, which mainly includes a shielding box 1, a magnetic field construction part 2, a motion mechanism 3, a temperature field construction part, a standard single-core wire, a current measurement part, and a temperature measurement part. Among them, the shielding box 1 is internally provided with a magnetic field construction part 2, a motion mechanism 3, a temperature field construction part, a standard single-core wire, a current measurement part, and a temperature measurement part. The magnetic field construction part 2 is located in the middle position inside the shielding box 1 and is used to construct a set magnetic field in the middle of the shielding box 1. The motion mechanism 3 is located inside the shielding box 1 and is used to drive the battery FFC cable to reciprocate longitudinally in the set magnetic field. The temperature field construction part is used to construct a temperature field with a set temperature inside the shielding box 1. The standard single-core wire is located inside the shielding box 1 and is used for detection comparison. The specification of the standard single-core wire is the same as that of the branch line of the battery FFC cable and is arranged in parallel on one side of the battery FFC cable. The current measurement part is used to detect the current of each branch line of the battery FFC cable and the standard single-core wire. The temperature measurement part is used to detect the temperature at each place of the battery FFC cable. Among them, the current measurement part and the temperature measurement part are respectively connected to the controller to facilitate real-time collection of data information.

[0026] In this embodiment, a set magnetic field is constructed in the middle of the shielding box 1 by the magnetic field construction part 2, and then the motion mechanism 3 drives the battery FFC cable to reciprocate longitudinally in the set magnetic field. Due to the action of magnetic force, an eddy current effect is generated in the battery FFC cable, so that it can quickly and accurately detect whether there is an open circuit or a short circuit in the battery FFC cable, and thus realize the quality control of the battery FFC cable. At the same time, by setting the standard single-core wire for detection comparison, the detection result can be made more accurate and reliable, and the situation of misjudgment can be avoided. In addition, the present application can also use the temperature field construction part to construct a temperature field with a set temperature inside the shielding box 1, so that the battery FFC cable can be tested in a high-temperature environment, thereby simulating the real working scenario and improving the accuracy of the detection result.

[0027] In some embodiments, the magnetic field construction part 2 is an electromagnetic coil.

[0028] Specifically, the magnetic field construction part 2 is an electromagnetic coil, which is convenient for the installation and maintenance of the magnetic field construction part 2, is beneficial to extending the service life, and ensures the overall stability of the product.

[0029] Example 2 As Figure 2 shown, an embodiment of the present invention provides a method for detecting a battery FFC flexible cable, which is used for a battery FFC flexible cable detection device as described above, and includes the following steps: S1. The motion mechanism drives the middle parts of the battery FFC flexible cable and the standard single-core wire to reciprocate longitudinally within a set magnetic field; S2. Record the current curves of each branch of the standard single-core wire and the battery FFC flexible cable; S3. Compare the current curves of each branch of the battery FFC flexible cable with the current curve of the standard single-core wire to determine whether the battery FFC flexible cable is qualified.

[0030] Specifically, the method provided by the embodiment of the present invention is a method for detecting a battery FFC flexible cable. This battery FFC flexible cable detection method mainly includes three steps, namely step S1, step S2, and step S3. First, execute step S1, where the motion mechanism drives the middle parts of the battery FFC flexible cable and the standard single-core wire to reciprocate longitudinally within a set magnetic field. Then, execute step S2, where the current curves of each branch of the standard single-core wire and the battery FFC flexible cable are recorded. Finally, execute step S3, where the current curves of each branch of the battery FFC flexible cable are compared with the current curve of the standard single-core wire to determine whether the battery FFC flexible cable is qualified.

[0031] In this embodiment, a set magnetic field is constructed in the middle of the shielding box by the magnetic field construction part, and then the motion mechanism drives the battery FFC flexible cable to reciprocate longitudinally within the set magnetic field. Due to the action of the magnetic force, an eddy current effect is generated in the battery FFC flexible cable, so that it can quickly and accurately detect whether there is an open circuit or a short circuit in the battery FFC flexible cable, thereby realizing the quality control of the battery FFC flexible cable. At the same time, by setting a standard single-core wire for detection and comparison, the detection result can be made more accurate and reliable, avoiding misjudgment. In addition, this application can also use the temperature field construction part to construct a temperature field with a set temperature in the shielding box, so that the battery FFC flexible cable can be tested in a high-temperature environment, thereby simulating a real working scenario and improving the accuracy of the detection result.

[0032] In some embodiments, step S3 includes the following steps: S31. The degree of change in the peak of the current curve and the fluctuation change rate; S32. When the degree of change in the peak is less than the first peak threshold and the fluctuation change rate is less than the first fluctuation threshold, the battery FFC flexible cable is determined to be a qualified product; S33. When the degree of change in the peak is greater than the second peak threshold or the fluctuation change rate is greater than the second fluctuation threshold, the battery FFC flexible cable is determined to be a non-qualified product.

[0033] Specifically, step S3 includes three sub-steps, namely step S31, step S32, and step S33. First, execute step S31 to obtain the peak change degree and fluctuation change rate of the current curve. Then, execute step S32. When the peak change degree is less than the first peak threshold and the fluctuation change rate is less than the first fluctuation threshold, the battery FFC cable is determined to be a qualified product. Finally, execute step S33. When the peak change degree is greater than the second peak threshold or the fluctuation change rate is greater than the second fluctuation threshold, the battery FFC cable is determined to be a non-conforming product.

[0034] In this embodiment, when the battery FFC cable operates normally, due to the continuity of the current, the current curve will show a stable state. At this time, the peak change degree of the current curve is small and the fluctuation change rate is also very small. If there is an open circuit or short circuit in the battery FFC cable, it will cause the current to interrupt or the current to be abnormal, resulting in a large peak change degree of the current curve and a corresponding increase in the fluctuation change rate. Therefore, by analyzing the peak change degree and fluctuation change rate of the current curve, it is possible to determine whether there is a fault in the battery FFC cable.

[0035] In some embodiments, step S3 further includes the following steps: S34, when the peak change degree is less than the second peak threshold and greater than the first peak threshold, it is determined that the conductor is broken, and enter step S35; S35, increase the movement amplitude of the moving mechanism, and enter step S2; S36, after secondary detection, when the peak change degree is less than the second peak threshold and greater than the first peak threshold, the battery FFC cable is determined to be a defective product.

[0036] Specifically, step S3 further includes three sub-steps, namely step S34, step S35, and step S36. First, execute step S34. When the peak change degree is less than the second peak threshold and greater than the first peak threshold, it is determined that the conductor is broken. Then, execute step S35 to increase the movement amplitude of the moving mechanism and enter step S2. Finally, execute step S36. After secondary detection, when the peak change degree is less than the second peak threshold and greater than the first peak threshold, the battery FFC cable is determined to be a defective product.

[0037] In this embodiment, if the peak change degree of the current curve is less than the second peak threshold and greater than the first peak threshold, it indicates that there may be a conductor break in the battery FFC cable. At this time, the movement amplitude of the moving mechanism can be increased for secondary detection. If the peak change degree after secondary detection is still less than the second peak threshold and greater than the first peak threshold, it can be determined that the battery FFC cable is a defective product.

[0038] In some embodiments, step S3 further includes the following steps: S37. When the rate of fluctuation change is less than the second fluctuation threshold and greater than the first fluctuation threshold, it is determined that there is insulation breakage, and step S38 is entered. S38. Reduce the movement frequency of the moving mechanism and enter step S2. S39. After secondary detection, when the rate of fluctuation change is less than the second fluctuation threshold and greater than the first fluctuation threshold, the battery FFC cable is determined to be a defective product.

[0039] Specifically, step S3 further includes three sub-steps, namely step S37, step S38, and step S39. First, step S37 is executed. When the rate of fluctuation change is less than the second fluctuation threshold and greater than the first fluctuation threshold, it is determined that there is insulation breakage. Then, step S38 is executed to reduce the movement frequency of the moving mechanism and enter step S2. Finally, step S39 is executed. After secondary detection, when the rate of fluctuation change is less than the second fluctuation threshold and greater than the first fluctuation threshold, the battery FFC cable is determined to be a defective product.

[0040] In this embodiment, if the rate of fluctuation change of the current curve is less than the second fluctuation threshold and greater than the first fluctuation threshold, it indicates that there may be insulation breakage in the battery FFC cable. At this time, secondary detection can be performed by reducing the movement frequency of the moving mechanism. If the rate of fluctuation change after secondary detection is still less than the second fluctuation threshold and greater than the first fluctuation threshold, it can be determined that the battery FFC cable is a defective product.

[0041] As Figure 3 shown, in some embodiments, the following steps are further included: S4. Continuously reciprocate the qualified products and defective products, and the detection environment is gradually heated. S5. Detect the temperature rise rate of the standard single-core wire and the temperature rise rate at each part of the FFC cable. S6. Compare the temperature rise rate at each part of the FFC cable with the temperature rise rate of the standard single-core wire, classify the battery FFC cable, and determine the unqualified products.

[0042] Specifically, step S4 includes two sub-steps, namely step S4 and step S5. First, step S4 is executed to continuously reciprocate the qualified products and defective products, and the detection environment is gradually heated. Then, step S5 is executed to detect the temperature rise rate of the standard single-core wire and the temperature rise rate at each part of the FFC cable. Finally, step S6 is executed to compare the temperature rise rate at each part of the FFC cable with the temperature rise rate of the standard single-core wire, classify the battery FFC cable, and determine the unqualified products.

[0043] In this embodiment, by gradually increasing the temperature of the detection environment, the performance of different types of battery FFC cables in a high-temperature environment can be observed, so that the battery FFC cables can be graded and defective products can be determined. At the same time, by setting a standard single-core wire as a reference, the temperature rise rates of different types of battery FFC cables can be compared more precisely, thereby improving the reliability of the detection results.

[0044] In some embodiments, step S6 includes the following steps: S61, when the temperature rise rate is less than the first temperature rise threshold, go to step S62; S62, when the battery FFC cable is a qualified product, the battery FFC cable is a first-class product; when the battery FFC cable is a defective product, the battery FFC cable is a second-class product; S63, when the temperature rise rate is greater than the first temperature rise threshold and less than the second temperature rise threshold, go to step S64; S64, when the battery FFC cable is a qualified product, the battery FFC cable is a second-class product; when the battery FFC cable is a defective product, the battery FFC cable is a defective product; S65, when the temperature rise rate is greater than the second temperature rise threshold, the battery FFC cable is a defective product.

[0045] Specifically, step S6 includes five sub-steps, namely step S61, step S62, step S63, step S64 and step S65. First, execute step S61 when the temperature rise rate is less than the first temperature rise threshold. Then execute step S62. When the battery FFC cable is a qualified product, the battery FFC cable is a first-class product; when the battery FFC cable is a defective product, the battery FFC cable is a second-class product. Then execute step S63 when the temperature rise rate is greater than the first temperature rise threshold and less than the second temperature rise threshold. Then execute step S64. When the battery FFC cable is a qualified product, the battery FFC cable is a second-class product; when the battery FFC cable is a defective product, the battery FFC cable is a defective product. Finally, execute step S65. When the temperature rise rate is greater than the second temperature rise threshold, the battery FFC cable is a defective product.

[0046] In this embodiment, by gradually increasing the temperature of the detection environment, the performance of different types of battery FFC cables in a high-temperature environment can be observed, so that the battery FFC cables can be graded and defective products can be determined. At the same time, by setting a standard single-core wire as a reference, the temperature rise rates of different types of battery FFC cables can be compared more precisely, thereby improving the reliability of the detection results.

[0047] As Figure 4 shown, in some embodiments, the following steps are further included: S7. Continuously reciprocate the first-grade and second-grade products, raise the detection environment temperature to the actual working temperature of the battery FFC cable, and maintain for a set duration. S8. Record the current curves of each branch of the battery FFC cable at the actual working temperature. S9. Compare the current curves of each branch of the battery FFC cable at room temperature with the current curves of each branch of the battery FFC cable at the actual working temperature, and grade the battery FFC cable.

[0048] Specifically, step S7 includes a sub-step, which is step S7. First, execute step S7, continuously reciprocate the first-grade and second-grade products, raise the detection environment temperature to the actual working temperature of the battery FFC cable, and maintain for a set duration. Then execute step S8, record the current curves of each branch of the battery FFC cable at the actual working temperature. Finally, execute step S9, compare the current curves of each branch of the battery FFC cable at room temperature with the current curves of each branch of the battery FFC cable at the actual working temperature, and grade the battery FFC cable.

[0049] In this embodiment, by gradually increasing the temperature of the detection environment, the performance of different types of battery FFC cables in a high-temperature environment can be observed, so that the battery FFC cables can be graded and defective products can be determined. At the same time, by setting a standard single-core cable as a reference, the temperature rise rates of different types of battery FFC cables can be compared more accurately, thereby improving the reliability of the detection results.

[0050] In some embodiments, step S9 includes the following steps: S91. When the current difference rate is less than the difference rate threshold, go to step S92; S92. When the battery FFC cable is a first-grade product, the battery FFC cable is a grade A product; when the battery FFC cable is a second-grade product, the battery FFC cable is a grade B product. S93. When the current difference rate is greater than the difference rate threshold, go to step S94; S94. When the battery FFC cable is a first-grade product, the battery FFC cable is a grade B product; when the battery FFC cable is a second-grade product, the battery FFC cable is a grade C product.

[0051] Specifically, step S9 includes four sub-steps, namely step S91, step S92, step S93, and step S94. First, step S91 is executed when the current difference rate is less than the difference rate threshold. Then, step S92 is executed. When the battery FFC cable is a first-class product, the battery FFC cable is a grade A product; when the battery FFC cable is a second-class product, the battery FFC cable is a grade B product. Then, step S93 is executed when the current difference rate is greater than the difference rate threshold. Finally, step S94 is executed. When the battery FFC cable is a first-class product, the battery FFC cable is a grade B product; when the battery FFC cable is a second-class product, the battery FFC cable is a grade C product.

[0052] In this embodiment, by gradually increasing the temperature of the detection environment, the performance of different types of battery FFC cables in a high-temperature environment can be observed, so that the battery FFC cables can be graded and defective products can be determined. At the same time, by setting a standard single-core wire as a reference, the temperature rise rate of different types of battery FFC cables can be compared more accurately, thereby improving the reliability of the detection results.

[0053] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A battery FFC cable detection device, characterized in that: include: Shielding box (1); A magnetic field construction unit (2), which is used to construct a set magnetic field in the middle of the shielding box (1); A motion mechanism (3) is used to drive the battery FFC cable to move back and forth longitudinally within a set magnetic field; A temperature field construction unit, used to construct a temperature field of a set temperature in the shielding box (1); A standard single-core wire, which is used as a comparison for testing. The standard single-core wire has the same specifications as the branch wire of the battery FFC cable and is laid in parallel on one side of the battery FFC cable; The current metering unit is used to detect the current of each branch line of the battery FFC cable and the standard single-core wire; The temperature measurement unit is used to detect the temperature of various locations on the battery FFC cable.

2. A battery FFC cable detection device according to claim 1, characterized in that: The magnetic field construction part (2) is an electromagnetic coil.

3. A battery FFC cable detection method, used in a battery FFC cable detection device as claimed in claim 1, characterized in that: The following steps are involved: S1. The motion mechanism drives the middle part of the battery FFC cable and the standard single-core cable to reciprocate longitudinally in the set magnetic field; S2. Record the current curves of each branch of the standard single-core cable and the battery FFC cable; S3. Compare the current curve of each branch line of the battery FFC cable with the current curve of the standard single-core cable to determine whether the battery FFC cable is qualified.

4. A battery FFC cable detection method according to claim 3, characterized in that: The step S3 comprises the following steps: S31, the degree of change of the peak value and the rate of change of fluctuation of the current curve; S32, when the peak change degree is less than the first peak threshold and the fluctuation change rate is less than the first fluctuation threshold, the battery FFC cable is determined to be a qualified product; S33, when the peak change degree is greater than the second peak threshold or the fluctuation change rate is greater than the second fluctuation threshold, the battery FFC cable is determined to be a defective product.

5. A battery FFC cable detection method according to claim 4, characterized in that: The step S3 further comprises the following steps: S34, when the peak change degree is less than the second peak threshold and greater than the first peak threshold, it is determined that the conductor is broken, and the process goes to step S35; S35, increasing the movement amplitude of the movement mechanism and entering step S2; S36, after the second detection, when the peak change degree is less than the second peak threshold and greater than the first peak threshold, the battery FFC cable is determined to be defective.

6. A battery FFC cable detection method according to claim 5, characterized in that: The step S3 further comprises the following steps: S37, when the fluctuation change rate is less than the second fluctuation threshold and greater than the first fluctuation threshold, it is determined to be insulation damage, and the process goes to step S38; S38, reducing the movement frequency of the movement mechanism and entering step S2; S39, after the second detection, when the fluctuation change rate is less than the second fluctuation threshold and greater than the first fluctuation threshold, the battery FFC cable is determined to be defective.

7. A battery FFC cable detection method according to claim 6, characterized in that: The following steps are also included: S4, the qualified products and defective products are continuously moved back and forth, and the testing environment is gradually heated up; S5, testing the temperature rise rate of the standard single-core wire and the temperature rise rate of each part of the FFC cable; S6, compare the temperature rise rate at each location of the FFC cable with the temperature rise rate of the standard single-core cable, classify the battery FFC cables and identify defective products.

8. A battery FFC cable detection method according to claim 7, characterized in that: The step S6 comprises the following steps: S61, when the temperature rise rate is less than the first temperature rise threshold, proceed to step S62; S62, when the battery FFC cable is a qualified product, the battery FFC cable is a first-class product, and when the battery FFC cable is a defective product, the battery FFC cable is a second-class product; S63, when the temperature rise rate is greater than the first temperature rise threshold and less than the second temperature rise threshold, proceed to step S64; S64, when the battery FFC cable is a qualified product, the battery FFC cable is a second-level product, and when the battery FFC cable is a defective product, the battery FFC cable is an unqualified product; S65: When the temperature rise rate is greater than the second temperature rise threshold, the battery FFC cable is a defective product.

9. A battery FFC cable detection method according to claim 8, characterized in that: The following steps are also included: S7, the first-level product and the second-level product are continuously moved back and forth, the detection environment temperature is raised to the actual working temperature of the battery FFC cable, and maintained for a set time; S8, recording the current curve of each branch of the battery FFC cable at the actual working temperature; S9. Compare the current curve of each branch line of the battery FFC cable at room temperature with the current curve of each branch line of the battery FFC cable at the actual working temperature, and grade the battery FFC cables.

10. A battery FFC cable detection method according to claim 9, characterized in that: The step S9 comprises the following steps: S91, when the current difference rate is less than the difference rate threshold, proceed to step S92; S92, when the battery FFC cable is a first-class product, the battery FFC cable is an A-class product; when the battery FFC cable is a second-class product, the battery FFC cable is a B-class product; S93, when the current difference rate is greater than the difference rate threshold, proceed to step S94; S94, when the battery FFC cable is a first-grade product, the battery FFC cable is a B-grade product. When the battery FFC cable is a second-grade product, the battery FFC cable is a C-grade product.

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