Pole edge straightness detection equipment and battery cell winding production line

Abstract

The present invention discloses a device for detecting the straightness of an edge of a pole piece, which includes a pole piece conveying device and a pole piece edge detection mechanism. The pole piece conveying device passes through the pole piece edge detection mechanism. The pole piece edge detection device includes a plurality of groups of detection mark processing devices. The detection mark processing devices are arranged directly above or directly below the pole piece conveying device. The plurality of groups of detection mark processing devices are arranged side by side along the conveying direction of the pole piece conveying device. The pole piece conveying device conveys the pole piece into the pole piece edge detection mechanism in a segmented manner. The detection mark processing device is aligned with the side edge of the pole piece conveyed by the pole piece conveying device. The detection mark processing device detects the straightness of the side edge of the pole piece and marks the pole piece segment detected to be uneven. The pole piece edge straightness detection device of the present invention can automatically perform a full inspection on the pole piece. In addition, the present invention also discloses a battery cell winding production line.

Description

Technical Field

[0001] The present invention relates to the field of lithium battery manufacturing, and in particular to a pole piece edge straightness detection device and a battery cell winding production line. Background Art

[0002] In the production process of lithium batteries, the positive electrode sheet, negative electrode sheet and separator need to be wound and wound to form a tightly connected battery cell, and then the battery cell is placed in a battery shell for liquid injection and sealing to make a completed battery.

[0003] Before winding production, the large electrode sheet unwound from the electrode sheet roll is very wide, so it is necessary to cut the large electrode sheet into small electrode sheets of a certain width. Equipment defects or incoming material defects may cause the edges of the cut small electrode sheets to be uneven. Once the straightness of the edge of the small electrode sheet exceeds the specified range, the battery cell made with the small electrode sheet will have performance or safety risks. For example, if the spacing between the positive and negative electrodes in the uneven area is too small, when slight lithium deposition occurs, the deposited lithium dendrites will penetrate the diaphragm and cause a short circuit.

[0004] Therefore, in order to avoid the above situation, the edge straightness of the small pole piece is usually checked manually before the battery cell winding operation. However, since the pole piece is generally very long, it is difficult to fully inspect the pole piece, and the accuracy of manual inspection is not high, and it is difficult to accurately determine whether the edge of the pole piece meets the straightness requirement.

[0005] Therefore, there is an urgent need for a pole piece edge straightness detection device and a battery cell winding production line that can automatically perform a full inspection of the pole piece to overcome the above-mentioned defects. Summary of the invention

[0006] The object of the present invention is to provide a pole piece edge straightness detection device which can automatically perform full inspection on pole pieces.

[0007] Another object of the present invention is to provide a battery cell winding production line capable of identifying defective battery cells.

[0008] To achieve the above-mentioned purpose, the electrode edge straightness detection equipment of the present invention includes an electrode conveying device and an electrode edge detection mechanism, the electrode conveying device passes through the electrode edge detection mechanism, the electrode edge detection device includes several groups of detection mark processing devices, and the several groups of detection mark processing devices are arranged side by side along the conveying direction of the electrode conveying device. The electrode conveying device conveys the electrode into the electrode edge detection mechanism in sections, the detection mark processing device is aligned with the side edge of the electrode conveyed by the electrode conveying device, and the detection mark processing device detects the straightness of the side edge of the electrode and marks the electrode segment detected to be uneven.

[0009] Preferably, the detection mark processing device punches holes on the side edges of the pole piece to perform marking.

[0010] Preferably, the detection mark processing device includes a ranging transmitter, a ranging receiver, a puncher and a controller, the ranging transmitter, the ranging receiver and the puncher are each electrically connected to the controller, the ranging transmitter and the ranging receiver are arranged in front of each other, the puncher is arranged between the ranging transmitter and the ranging receiver, and the ranging transmitter, the ranging receiver and the puncher are each aligned with the side edge of the pole piece.

[0011] Preferably, the detection mark processing device has at least a first position away from the electrode conveying device and a second position close to the electrode conveying device relative to the electrode conveying device. When the electrode conveying device conveys the electrode to the electrode edge detection mechanism, the detection mark processing device switches from the first position to the second position.

[0012] Preferably, the pole piece edge detection mechanism also includes an upper and lower drive, a positioning frame and a mounting frame, wherein the mounting frame is slidably mounted on the positioning frame, the detection mark processing device is mounted on the mounting frame, and the mounting frame is mounted on the output end of the upper and lower drives, and the upper and lower drives drive the mounting frame to slide up and down to drive the detection mark processing device to move back and forth between the first position and the second position.

[0013] Preferably, the pole piece edge detection mechanism further comprises a structural shell and a distance detector, the positioning frame is installed in the structural shell, the upper and lower drivers are installed on the structural shell, and the distance detector is installed on the mounting frame and aligned with the middle of the pole piece.

[0014] Preferably, the electrode conveying device is a belt conveying device, the electrode conveying device is arranged with adjustable tension, the electrode conveying device is arranged with adjustable left and right movement, the positioning frame is provided with a supporting platform located below the electrode conveying device, the tension of the electrode conveying device is reduced when the electrode conveying device conveys the electrode into the electrode edge detection mechanism so that the electrode falls on the supporting platform, and a width detector is provided on each side of the supporting platform, the width of the supporting platform is smaller than the width of the electrode, the two width detectors are used to detect the width of the portion of the electrode exposed on the supporting platform, and the electrode conveying device moves left and right for adjustment when the two width detectors detect that the widths of the exposed portions on both sides of the electrode are inconsistent, so as to make the widths of the exposed portions on both sides of the electrode equal.

[0015] To achieve the above-mentioned other purpose, the battery cell winding production line of the present invention comprises the above-mentioned electrode edge straightness detection device and winding mechanism. The winding mechanism comprises a first mark detection device, a second mark detection device and a winding device, the winding device is arranged between the first mark detection device and the second mark detection device, the first mark detection device and the second mark detection device are both equipped with cutting knives at the rear side, the first mark detection device is used to detect whether the positive electrode sheet and the electrode segment are marked, the second mark detection device is used to detect whether the negative electrode sheet is marked, and the winding device winds the outflowing positive electrode sheet and negative electrode sheet into a battery cell.

[0016] Preferably, the first mark detection device and the second mark detection device each include a plurality of mark detection transmitters and a mark detection receiver. The mark detection receiver is arranged directly below the mark detection transmitter. The mark detection receiver and the mark detection transmitter enclose a mark detection flow channel for the electrode piece to flow. The mark detection receiver receives the signal emitted by the mark detection transmitter when a pole piece of the electrode piece is marked.

[0017] Preferably, the battery cell winding production line of the present invention further comprises a loading platform and a removal device installed on the rear side of the winding mechanism, wherein the loading platform is provided with a plurality of battery cell loading tables for placing battery cells, and the removal device removes the battery cells containing markers from the battery cell loading table.

[0018] Compared with the prior art, the electrode edge straightness detection device of the present invention includes an electrode conveying device and an electrode edge detection mechanism. The electrode conveying device passes through the electrode edge detection mechanism, and the electrode edge detection mechanism includes a plurality of groups of detection mark processing devices. The detection mark processing devices are arranged directly above the electrode conveying device, and the plurality of groups of detection mark processing devices are arranged side by side along the conveying direction of the electrode conveying device. The electrode conveying device conveys the electrode to the electrode edge detection mechanism in sections, and the detection mark processing device is aligned with the side edge of the electrode conveyed by the electrode conveying device. The detection mark processing device detects the straightness of the electrode edge and marks the electrode segment detected to be uneven. In this way, when the electrode conveying device is used to convey the electrode to the electrode edge detection mechanism section by section, the electrode edge detection mechanism can automatically detect the straightness of the side edge of each electrode segment, and the production automation degree is high. By conveying the electrode to the electrode edge detection mechanism section by section, the entire roll of electrode can be detected. Moreover, since the detection mark processing devices are arranged side by side, several detection mark processing devices can perform straightness detection on each side edge of the pole segment, so as to achieve full detection and ensure the comprehensiveness and effectiveness of the detection. When the detection mark processing device detects that the side edge of the pole segment is uneven, it will mark the part, so as to facilitate the identification of the uneven side edge of the pole segment and facilitate subsequent processing.

[0019] It can be understood that since the battery cell winding production line of the present invention includes the above-mentioned electrode edge straightness detection equipment and winding mechanism, when the electrode segment of at least one of the positive electrode sheet and the negative electrode sheet has been marked, it can be detected by the first marking detection device or the second marking detection device, thereby recording the electrode segment as a defective product, and the battery cell formed by winding the winding device is a defective product, so that the defective products can be identified and discarded, thereby avoiding the output of defective products. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the planar structure of the battery cell winding production line of the present invention.

[0021] Figure 2 It is a three-dimensional structural schematic diagram of the pole piece edge straightness detection device of the present invention.

[0022] Figure 3 It is a planar structural schematic diagram of the pole piece edge detection mechanism when the detection mark processing device is in the first position.

[0023] Figure 4 It is a schematic diagram of the planar structure of the pole piece edge detection machine when the detection mark processing device is in the second position.

[0024] Figure 5 yes Figure 3 The shown schematic diagram of the three-dimensional structure of the pole piece edge detection mechanism behind the hidden structural shell, upper and lower drivers and mounting frame.

[0025] Figure 6 Is further hidden Figure 5 Schematic diagram of the three-dimensional structure after the middle support platform, width detector and example detector.

[0026] Figure 7 It is a simplified structural diagram of the pole piece edge detection mechanism when detecting the straightness of the side edge of the pole piece.

[0027] Figure 8 It is a three-dimensional structural schematic diagram of the upper and lower drivers cooperating with the mounting frame.

[0028] Fig. 9 It is a schematic diagram of the planar structure of the first mark detection device or the second mark detection device when detecting a pole piece with a marker (through hole).

[0029] Fig.10 It is a schematic diagram of the planar structure when the first mark detection device or the second mark detection device detects a qualified electrode piece.

[0030] Fig.11 Schematic diagram of the planar structure of the electrode to be tested. DETAILED DESCRIPTION

[0031] In order to explain the technical content and structural features of the present invention in detail, further description will be given below in combination with the implementation modes and the accompanying drawings.

[0032] like Figures 1 to 5 , Figure 7 As shown, the battery cell winding production line 100 of the present invention includes a pole piece edge straightness detection device 10 and a winding mechanism 20. The pole piece edge straightness detection device 10 includes a pole piece conveying device 11 and a pole piece edge detection mechanism 12. The pole piece conveying device 11 passes through the pole piece edge detection mechanism 12, and the pole piece edge detection mechanism 12 includes a plurality of groups of detection mark processing devices 121. The detection mark processing devices 121 are arranged directly above the pole piece conveying device, and the plurality of groups of detection mark processing devices 121 are arranged side by side along the conveying direction of the pole piece conveying device 11. The pole piece conveying device 11 conveys the pole piece 200 into the pole piece edge detection mechanism 12 in sections, and the detection mark processing device 121 is aligned with the side edge of the pole piece 200 conveyed by the pole piece conveying device 11. The detection mark processing device 121 detects the straightness of the edge of the pole piece 200 and marks the pole piece segment detected to be uneven. In this way, when the electrode 200 is transported to the electrode edge detection mechanism 12 section by section using the electrode conveying device 11, the electrode edge detection mechanism 12 can automatically detect the straightness of the side edge of each electrode segment, and the production automation level is high. The electrode 200 is transported to the electrode edge detection mechanism 12 section by section, and the entire roll of electrode can be inspected. Moreover, since the detection mark processing devices 121 are arranged side by side, several detection mark processing devices 121 can perform straightness detection on each side edge of the electrode segment, so as to achieve full inspection and ensure the comprehensiveness and effectiveness of the inspection. When the detection mark processing device 121 detects that the side edge of the electrode segment is uneven, it will mark the part, so as to facilitate the identification of the uneven side edge of the electrode segment and facilitate subsequent processing.

[0033] Of course, according to actual needs, the detection mark processing device 121 can also be arranged directly below the electrode conveying device. In this embodiment, the electrode edge detection mechanism 12 includes two rows of detection mark processing devices 121 to simultaneously detect and mark the edges of both sides of the electrode segment for straightness, thereby improving the detection efficiency. The above-mentioned unevenness means that there are protrusions or depressions on the side edges of the electrode segment that do not meet the production requirements. The marking processing performed by the detection mark processing device 121 includes but is not limited to the following punching, coding, spraying graphics, shearing, etc. In this embodiment, the detection mark processing device 121 punches the side edges of the electrode 200 for marking, but is not limited to this.

[0034] like Figure 7As shown, the detection mark processing device 121 includes a ranging transmitter 1211, a ranging receiver 1212, a puncher 1213 and a controller 1214. The ranging transmitter 1211, the ranging receiver 1212 and the puncher 1213 are each electrically connected to the controller 1214, the ranging transmitter 1211 and the ranging receiver 1212 are arranged one after the other, the puncher 1213 is arranged between the ranging transmitter 1211 and the ranging receiver 1212, and the ranging transmitter 1211, the ranging receiver 1212 and the puncher 1213 are each aligned with the side edge of the pole piece 200. During the detection, the ranging transmitter 1211 sends a signal to the side edge of the pole piece 200, and the signal is sent to the ranging receiver 1212 through the transmission of the side edge. The time of the whole process is t. If the straightness of the side edge meets the requirements, the time of this test is a qualified constant value (or allowed to fluctuate within a certain tolerance range), and the distance between the side edge detection point of the pole piece 200 and the detection mark processing device 121 is a qualified distance, and the puncher 1213 does not work. If the time obtained by the test exceeds or is less than a certain range, it means that the distance between the side edge of the pole piece 200 and the detection mark processing device 121 is an unqualified distance, which is manifested in the side edge being uneven and concave and convex, and the degree of concave and convex exceeds the process range. At this time, the puncher 1213 performs a punching process on the side edge. Preferably, the ranging transmitter 1211 is a laser transmitter, the ranging receiver 1212 is a laser receiver, and the puncher 1213 is a laser puncher, but it is not limited to this.

[0035] like Figure 3 , Figure 4 and Figure 7 As shown, the detection mark processing device 121 has at least a first position away from the electrode conveying device 11 and a second position close to the electrode conveying device 11 relative to the electrode conveying device 11. When the electrode conveying device 11 conveys the electrode 200 to the electrode edge detection mechanism 12, the detection mark processing device 121 switches from the first position to the second position. When the detection mark processing device 121 moves to the second position, the detection mark processing device 121 is close enough to the side edge of the electrode 200 to be detected to ensure the accuracy of the detection. After the detection, the detection mark processing device 121 moves back to the first position to facilitate the conveyance of the next section of the electrode 200.

[0036] like Figures 3 to 8As shown, the pole piece edge detection mechanism 12 also includes an upper and lower driver 122, a positioning frame 123 and a mounting frame 124. The mounting frame 124 is slidably mounted on the positioning frame 123, the detection mark processing device 121 is mounted on the mounting frame 124, and the mounting frame 124 is mounted on the output end of the upper and lower drivers 122. The upper and lower drivers 122 drive the mounting frame 124 to slide up and down to drive the detection mark processing device 121 to move back and forth between the first position and the second position. The upper and lower drivers 122 facilitate the precise control of the detection mark processing device 121 to move to different positions, and the movement of the mounting frame 124 is guided by the positioning frame 123, and the movement is stable. Preferably, a slide groove structure 1231 extending in the up and down direction is provided on the positioning frame 123, and the mounting frame 124 is slidably mounted in the slide groove structure 1231. For example, the upper and lower drivers 122 are a combination of a motor and a gear rack structure, but are not limited thereto.

[0037] like Figures 3 to 5 As shown, the pole piece edge detection mechanism 12 also includes a structural housing 125 and a distance detector 126. The positioning frame 123 is installed in the structural housing 125, the upper and lower drivers 122 are installed on the structural housing 125, and the distance detector 126 is installed on the mounting frame 124 and aligned with the middle of the pole piece 200. The structural housing 125 provides sufficient protection for the pole piece edge detection mechanism 12, and the distance detector 126 detects the distance between it and the pole piece 200, thereby facilitating the upper and lower drivers 122 to drive the mounting frame 124 to a certain position, so that the detection mark processing device 121 can accurately reach the second position. For example, the distance detector 126 is a laser rangefinder, but is not limited to this. The laser rangefinder can adopt the existing structure, so it is not repeated here.

[0038] like Figures 1 to 5As shown, the electrode conveying device 11 is a belt-winding conveying device (i.e., the electrode conveying device 11 conveys the electrode 200 by winding). The electrode conveying device 11 is arranged with adjustable tension. The electrode conveying device 11 is arranged to be movable left and right, and a supporting platform 1232 located below the electrode conveying device 11 is provided in the positioning frame 123. When the electrode conveying device 11 conveys the electrode 200 to the electrode edge detection mechanism 12, the tension is reduced so that the electrode 200 falls on the supporting platform 1232. The electrode 200 falling on the supporting platform 1232 is in a loose state, so that it can accurately detect whether the side edge of the electrode 200 is uneven. A width detector 127 is provided on each of the left and right sides of the supporting platform 1232, and the width of the supporting platform 1232 is smaller than the width of the electrode 200. The two width detectors 127 are used to detect the width of the portion of the electrode 200 exposed from the supporting platform 1232. When the two width detectors 127 detect that the widths of the exposed portions on both sides of the electrode sheet 200 are inconsistent, the electrode sheet conveying device 11 moves left and right to adjust so as to make the widths of the exposed portions on both sides of the electrode sheet 200 equal. Only when the widths of the exposed portions on both sides of the electrode sheet 200 are equal can the side edge be accurately and comprehensively detected to determine whether it is uneven.

[0039] The electrode conveying device 11 is also provided with a guide roller 111, which supports the electrode 200 to prevent the electrode 200 from sagging. The electrode edge detection mechanism 12 can be used to detect the side edge of the positive electrode or the negative electrode. It should be noted that in this embodiment, the electrode edge detection mechanism 12 can be used to detect the straightness of each electrode segment before winding it up, and then the electrode 200 is released for winding. Of course, according to actual needs, the electrode 200 that has passed the electrode edge detection mechanism 12 may not be wound up, and directly enter the next step of winding the core.

[0040] like Figure 1As shown, the winding mechanism 20 includes a first mark detection device 21, a second mark detection device 22 and a winding device 23. The winding device 23 is arranged between the first mark detection device 21 and the second mark detection device 22, and a cutting knife 24 is installed on the rear side of the first mark detection device 21 and the second mark detection device 22. The first mark detection device 21 is used to detect whether the positive electrode sheet 201 has a marked electrode segment, and the second mark detection device 22 is used to detect whether the negative electrode sheet 202 has a marked electrode segment. The winding device 23 winds the positive electrode sheet 201 and the negative electrode sheet 202 into a battery cell 300. After the positive electrode sheet 201 and the negative electrode sheet 202 are wound into a battery cell 300, the cutting knife 24 cuts the positive electrode sheet 201 and the negative electrode sheet 202 respectively, and sends out the wound battery cell 300. When the first marking detection device 21 detects that a polar segment of the positive electrode sheet 201 is marked or the second marking detection device 22 detects that a polar segment of the negative electrode sheet 202 is marked, it is known that the battery cell 300 obtained by the current winding is unqualified and is subsequently discarded to ensure that unqualified battery cells 300 are not output, thereby ensuring product quality.

[0041] like Fig. 9 and Fig.10 As shown, the first mark detection device 21 and the second mark detection device 22 each include a plurality of mark detection transmitters 25 and a mark detection receiver 26. The mark detection receiver 26 is arranged directly below the mark detection transmitter 25. The mark detection receiver 26 and the mark detection transmitter 25 enclose a mark detection flow channel (not shown) for the electrode sheet (positive electrode sheet or negative electrode sheet) to flow. The mark detection receiver 26 receives a signal from the mark detection transmitter 25 when a electrode segment of the electrode sheet 200 is marked. For example, the mark detection transmitter 25 is a laser transmitter, and the mark detection receiver 26 is a laser receiver, but it is not limited thereto. In this embodiment, if at least one of the positive electrode sheet and the negative electrode sheet is marked (having a through hole), the signal emitted by the mark detection transmitter 25 passes through the through hole of the side edge of the electrode sheet 200, and the signal is received by the mark detection receiver 26, which means that the side edge of the electrode segment is not straight. It should be noted that the core winding process also includes the use of a diaphragm (not shown) for core winding. The diaphragm is partially omitted in the accompanying drawings because the diaphragm is an indispensable material for core winding and the process is well known to those skilled in the art and will not be described in detail here.

[0042] like Figure 1As shown, the battery cell winding production line 100 of the present invention also includes a loading platform 30 and a removal device 40 installed on the rear side of the winding mechanism 20. The loading platform 30 is provided with a plurality of battery cell loading tables 31 for placing the battery cells 300, and the removal device 40 moves the battery cells 300 containing markers out of the battery cell loading table 31. The battery cells 300 wound by the winding mechanism 20 are placed on the battery cell loading table 31 for temporary storage, and a plurality of battery cell loading tables 31 are provided to temporarily store the battery cells 300 at the same time, avoiding downtime and waiting. If the first marking detection device 21 and / or the second marking detection device 22 detects that the electrode piece 200 has a through hole, this section of the electrode piece is recorded, and the battery cell 300 formed by the winding core is a defective product, and the removal device 40 can be used to remove the defective product.

[0043] The working principle of the battery cell winding production line 100 of the present invention is explained below: first, the side edges of the positive / negative electrode sheets are tested for flatness using the electrode edge straightness detection equipment 10. Since the detection actions for the positive and negative electrode sheets are the same, they are collectively referred to as electrode sheets for description below.

[0044] The pole piece conveying device 11 delivers the pole piece 200 into the pole piece edge detection mechanism 12 in sections. When the pole piece 200 is conveyed to the bottom of the detection mark processing device 121, the conveying stops, and the tension of the pole piece conveying device 11 is controlled to be reduced, so that the pole piece 200 is placed flat on the support table 1232. At the same time, the two width detectors 127 detect whether the widths of the exposed parts on both sides of the pole piece 200 are equal. If they are not equal, the pole piece conveying device 11 is fine-tuned in the left and right directions until the widths of the exposed parts on both sides of the pole piece 200 are equal. Then, the distance detector 126 works to detect the distance between it and the pole piece 200. According to the distance value, the upper and lower drivers 122 drive the mounting frame 124 to move downward, so that the detection mark processing device 121 moves to the second position. The ranging transmitter 1211 sends a signal to the side edge of the pole piece 200, and the signal is sent to the ranging receiver 1212 through the transmission of the side edge. The time of the whole process is t. If the straightness of the side edge meets the requirements, the time of this test is a qualified constant value (or allowed to fluctuate within a certain tolerance range), and the distance between the side edge detection point of the pole piece 200 and the detection mark processing device 121 is a qualified distance, and the puncher 1213 does not work. If the time obtained by the test exceeds or is less than a certain range, it means that the distance between the side edge of the pole piece 200 and the detection mark processing device 121 is an unqualified distance, which is manifested in the side edge being uneven and concave and convex, and the degree of concave and convex exceeds the process range. At this time, the puncher 1213 performs a punching process on the side edge. After completion, the upper and lower drivers 122 drive the mounting frame 124 to move upward, so that the detection mark processing device 121 moves to the first position again, and the electrode conveying device 11 sends out the electrode section, and the next electrode section enters. The above operation is repeated until the detection is completed, and the electrode section after detection is rolled up.

[0045] Then, the core winding operation is performed. After the positive electrode sheet 201 and the negative electrode sheet 202 are released, the positive electrode sheet 201 enters the first mark detection device 21 to detect whether there is a through hole, and the negative electrode sheet 202 enters the second mark detection device 22 to detect whether there is a through hole. During this process, the mark detection transmitter 25 emits a laser signal. If the emitted signal can be received by the mark detection receiver 26, it means that the side edge of the section of the electrode sheet is uneven and recorded. The winding device 23 winds the positive electrode sheet 201, the negative electrode sheet 202 and the diaphragm into a battery cell 300, and the cutting knife 24 cuts the positive electrode sheet 201 and the negative electrode sheet 202. The wound battery cell 300 is placed on the battery cell loading platform 31. If the positive electrode sheet 201 and / or the negative electrode sheet 202 are recorded as uneven, the wound battery cell 300 is a defective product, and the removal device 40 can be used to remove the defective product from the battery cell loading platform 31.

[0046] The above disclosure is only a preferred embodiment of the present invention, which cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are all within the scope of the present invention.

Claims

1. A device for detecting the straightness of an edge of a pole piece, characterized in that: It includes a pole piece conveying device and a pole piece edge detection mechanism, the pole piece conveying device passes through the pole piece edge detection mechanism, the pole piece edge detection device includes a plurality of groups of detection mark processing devices, the detection mark processing devices are arranged directly above or directly below the pole piece conveying device, and the plurality of groups of the detection mark processing devices are arranged side by side along the conveying direction of the pole piece conveying device, the pole piece conveying device conveys the pole piece into the pole piece edge detection mechanism in a segmented manner, the detection mark processing devices are aligned with the side edges of the pole pieces conveyed by the pole piece conveying device, the detection mark processing devices detect the straightness of the side edges of the pole pieces and mark the pole piece segments detected to be uneven; the pole piece edge detection mechanism also includes an upper and lower driver, a positioning frame and a mounting frame, the mounting frame is slidably mounted on the positioning frame, the detection mark processing device is mounted on the mounting frame, the mounting frame is mounted on the output end of the upper and lower drivers, and the upper and lower drivers drive the mounting frame to slide up and down to drive the detection mark processing device to move the pole piece ... The marking processing device moves back and forth between the first position and the second position; the electrode edge detection mechanism also includes a structural shell and a distance detector, the positioning frame is installed in the structural shell, the upper and lower drivers are installed on the structural shell, and the distance detector is installed on the mounting frame and aligned with the middle of the electrode; the electrode conveying device is a belt winding conveying device, the electrode conveying device is in a tension-adjustable arrangement, and the electrode conveying device is in a left-right adjustable arrangement. A supporting platform located below the electrode conveying device is provided in the positioning frame, and the tension of the electrode conveying device when the electrode conveying device conveys the electrode to the electrode edge detection mechanism is reduced so that the electrode falls on the supporting platform. A width detector is provided on each side of the supporting platform, and the width of the supporting platform is smaller than the width of the electrode. The two width detectors are used to detect the width of the portion of the electrode exposed on the supporting platform. When the two width detectors detect that the widths of the exposed portions on both sides of the electrode are inconsistent, the electrode conveying device moves left and right to adjust to drive the widths of the exposed portions on both sides of the electrode to be equal.

2. The pole piece edge straightness detection device according to claim 1, characterized in that: The detection mark processing device punches holes on the side edges of the pole piece to mark them.

3. The pole piece edge straightness detection device according to claim 1, characterized in that: The detection mark processing device includes a ranging transmitter, a ranging receiver, a puncher and a controller. The ranging transmitter, the ranging receiver and the puncher are each electrically connected to the controller. The ranging transmitter and the ranging receiver are arranged in front of each other. The puncher is arranged between the ranging transmitter and the ranging receiver. The ranging transmitter, the ranging receiver and the puncher are each aligned with the side edge of the pole piece.

4. The pole piece edge straightness detection device according to claim 1, characterized in that: The detection mark processing device has at least a first position away from the electrode conveying device and a second position close to the electrode conveying device relative to the electrode conveying device. When the electrode conveying device conveys the electrode to the electrode edge detection mechanism, the detection mark processing device switches from the first position to the second position.

5. A battery cell winding production line, comprising a pole piece edge straightness detection device and a winding mechanism, wherein the pole piece winding straightness detection device is connected to the winding mechanism, and is characterized in that: The electrode sheet straightness detection device is as described in any one of claims 1 to 4, the winding mechanism includes a first mark detection device, a second mark detection device and a winding device, the winding device is arranged between the first mark detection device and the second mark detection device, and the first mark detection device and the second mark detection device are both equipped with cutting knives on the rear sides, the first mark detection device is used to detect whether the positive electrode sheet has a marked electrode segment, the second mark detection device is used to detect whether the negative electrode sheet has a marked electrode segment, and the winding device winds the outflowing positive and negative electrode sheets into battery cells.

6. The battery cell winding production line according to claim 5, characterized in that: The first mark detection device and the second mark detection device each include a plurality of mark detection transmitters and a mark detection receiver. The mark detection receiver is arranged directly below the mark detection transmitter. The mark detection receiver and the mark detection transmitter enclose a mark detection flow channel for the electrode piece to flow. The mark detection receiver receives the signal sent by the mark detection transmitter when a pole piece of the electrode piece is marked.

7. The battery cell winding production line according to claim 5, characterized in that: It also includes a loading platform and a removing device installed on the rear side of the winding mechanism. The loading platform is provided with a battery loading platform for placing multiple power supply cells, and the removing device removes the battery cells containing the markers from the battery loading platform.

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