Stacked battery cell production device and use method therefor

Abstract

The present application provides a stacked battery cell production device and a use method therefor. The stacked battery cell production device comprises a negative electrode conveying mechanism (10), two unwinding rollers (20), two positive electrode conveying mechanisms (40), a first identification member (51), a second identification member (52), a cutter (70), a winding needle (80), and two first thermal laminating rollers (61); the unwinding rollers (20) are configured to unwind corresponding separators (21) toward the downstream side; a remaining-length detection member (30) is provided outside each unwinding roller (20); the remaining-length detection member is configured to detect the remaining length of the separator (21) on the corresponding unwinding roller (20); the negative electrode conveying mechanism (10) can convey negative electrode sheets (18) between the two separators (21) at intervals; the remaining-length detection members (30) are communicatively connected to the negative electrode conveying mechanism (10); each positive electrode conveying mechanism (40) is configured to place positive electrode sheets (48) on the side of the corresponding separator (21) facing away from negative electrode sheets (18); the first identification member (51) is arranged between the positive electrode conveying mechanisms (40) and the unwinding rollers (20); a material receiving member (90) is located downstream of the cutter (70), and a material strip thermally laminated with the positive electrode sheets (48) is stacked within the material receiving member (90).

Description

Laminated battery cell production equipment and its usage

[0001] This application claims priority to Chinese Patent Application No. 202510112719.2, filed on January 23, 2025, and Chinese Patent Application No. 202520163498.7, filed on January 23, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery manufacturing technology, specifically to a stacked battery cell manufacturing apparatus and its usage method. Background Technology

[0003] The battery cell is manufactured by stacking, in which the negative electrode, positive electrode and separator are the core components. After stacking, the positive electrode and negative electrode are stacked alternately in the battery cell, and the two adjacent electrodes are separated by a separator. During production, the separator is the basis. Technical issues

[0004] Since producing one core pack requires 30-40 meters of separator, one roll of separator cannot be just enough to produce the last complete cell. During the production process, it is not possible to detect in time that the subsequent separator length is insufficient. After continuous production for a period of time, it is discovered that the length is insufficient, but by this time multiple positive and negative electrode plates have already been thermally bonded to the separator, which means that this part of the raw material cannot form a complete cell, resulting in the waste of positive and negative electrode raw materials. Technical solutions

[0005] In a first aspect, embodiments of this application provide a laminated battery cell production apparatus, comprising:

[0006] The negative electrode conveying mechanism includes two unwinding rollers, which are located on opposite sides of the negative electrode conveying mechanism. The unwinding rollers are configured to unwind their corresponding diaphragms downstream. Each unwinding roller is equipped with a residual material detection element, which is configured to detect the length of the remaining diaphragm on its corresponding unwinding roller. The negative electrode conveying mechanism is configured to convey negative electrode sheets at different intervals between the two diaphragms to convey the material belt downstream together with the two diaphragms. The residual material detection element is communicatively connected to the negative electrode conveying mechanism.

[0007] Two positive electrode conveying mechanisms are located downstream of the two unwinding rollers, one to one. The positive electrode conveying mechanisms are configured to place a positive electrode sheet on the side of the corresponding diaphragm away from the negative electrode sheet. The positive electrode sheets placed by the two positive electrode conveying mechanisms are arranged alternately.

[0008] The first identification element is provided between the positive electrode conveying mechanism and the corresponding unwinding roller on at least one side. The first identification element is configured to identify the engagement position of the corresponding unwinding roller and to communicate with the negative electrode conveying mechanism and the positive electrode conveying mechanism.

[0009] Two first hot composite rollers are located on both sides of the material strip and are configured to heat the material strip.

[0010] The second identification element is located downstream of the first thermal composite roller and is configured to identify the gap between the two negative electrode sheets.

[0011] The cutter and the coiling needle are located downstream of the second identification element. The cutter is communicatively connected to the second identification element and can cut the material strip. The coiling needle can clamp the material strip and rotate. The coiling needle can change its upstream and downstream position relative to the cutter.

[0012] The receiving unit is located downstream of the cutter, and the strip with the positive electrode sheet thermally bonded to it is stacked inside the receiving unit.

[0013] Secondly, embodiments of this application provide a method of using a laminated battery cell production apparatus, applied to the aforementioned laminated battery cell production apparatus, the method of using the laminated battery cell production apparatus comprising:

[0014] The aforementioned residual detection component detects the length of the remaining diaphragm on the corresponding unwinding roller.

[0015] Determine whether the remaining length of the aforementioned diaphragm is sufficient for the use of one battery cell;

[0016] In response to the fact that the remaining length of the diaphragm meets the usage of one battery cell, the battery cell is produced normally, and the remaining length of the diaphragm on the corresponding unwinding roller is detected by the remaining quantity detection device.

[0017] In response to the fact that the remaining length of the above-mentioned diaphragm is not sufficient for the use of one battery cell, after the above-mentioned negative electrode conveying mechanism conveys enough of the above-mentioned negative electrode sheet for one battery cell, it conveys one more of the above-mentioned negative electrode sheet at a second interval, and then both the above-mentioned negative electrode conveying mechanism and the above-mentioned positive electrode conveying mechanism stop conveying.

[0018] The entire machine is stopped, and the two unwinding rollers are swapped. The two rolls of the diaphragm before and after the swapping of the same unwinding roller form the above-mentioned joint position.

[0019] The strip of material that is separated from the previous negative electrode by the second interval and brought to the joint position is discarded.

[0020] Continue producing battery cells and continue to perform the aforementioned remaining length test on the corresponding unwinding roller to detect the length of the aforementioned diaphragm. Beneficial effects

[0021] This application provides a stacked battery cell production apparatus. A negative electrode conveying mechanism conveys negative electrode sheets between two diaphragms. During normal production, the distance between two adjacent negative electrode sheets is a first interval. Two positive electrode conveying mechanisms alternately place positive electrode sheets downstream towards the side of the diaphragm away from the negative electrode sheets. A first thermal bonding roller thermally bonds the strips together, and the strips are stacked in a receiving unit to form a battery cell. When the remaining diaphragm on the unwinding roller (the diaphragms on the two unwinding rollers are fed synchronously with the same remaining amount) is insufficient to produce a complete battery cell, a remaining amount detection device sends a signal. The negative and positive electrode conveying mechanisms continue to convey negative and positive electrode sheets until the negative electrode conveying mechanism conveys a negative electrode sheet for a complete battery cell 210. Then, it conveys another negative electrode sheet at a second interval from the previous negative electrode sheet, stops the entire machine, and performs a strip splicing process on the two unwinding rollers. The connection point between the old and new diaphragms forms a diaphragm splice. At this time, the unwinding rollers operate, and the negative electrode conveying mechanism... When the positive electrode conveying mechanism stops feeding material, and the diaphragm tape passes the first identification element, the first identification element issues a command, and the negative electrode conveying mechanism begins to convey negative electrode sheets. The conveyed negative electrode sheet is set at a second interval with the second negative electrode sheet, and subsequent adjacent negative electrode sheets are set at a first interval. When the second interval downstream of the diaphragm tape passes the second identification element, the winding needle clamps the tape, and the cutter cuts the second interval. The winding needle moves downstream of the cutter to begin winding the rejection area. When the second interval upstream of the diaphragm tape passes the second identification element, after a preset time, the cutter cuts the second interval, and the winding needle takes away the rejection area. After removing the rejection area, the winding needle returns to the upstream of the cutter, and then a new cell can be stacked. Thus, this stacked cell production device can promptly detect when there is insufficient diaphragm, stop the machine to replace the diaphragm, and remove the position with diaphragm tape, avoiding the situation of feeding too many negative and positive electrode sheets onto the diaphragm and avoiding waste of raw materials.

[0022] This application also provides a method for using a laminated battery cell production apparatus. By setting up a margin detection device, the margin of the diaphragm on the unwinding tube is monitored at any time. When the margin is insufficient for one battery cell, after the positive and negative electrode sheets of the previous battery cell are finished being fed, one more negative electrode sheet is fed. When rejecting waste batteries later, the negative electrode sheet is used as an identification mark for rejection, thus avoiding the situation of feeding too many negative and positive electrode sheets onto the diaphragm and avoiding waste of raw materials. Attached Figure Description

[0023] Figure 1 is a schematic diagram of the structure of the stacked battery cell production apparatus provided in an embodiment of this application;

[0024] Figure 2 is a schematic diagram of the normal production and scrap rejection process of the material strip provided in the embodiment of this application;

[0025] Figure 3 is a flowchart of the method of using the stacked battery cell production apparatus provided in the embodiment of this application;

[0026] Figure 4 is a detailed flowchart of steps S60 provided in the embodiment of this application;

[0027] Figure 5 is a first state diagram of the material strip production provided in the embodiment of this application;

[0028] Figure 6 is a second state diagram of the strip production provided in an embodiment of this application;

[0029] Figure 7 is a third state diagram of the material strip production provided in the embodiment of this application;

[0030] Figure 8 is a fourth state diagram of the material strip production provided in the embodiment of this application;

[0031] Figure 9 is a diagram of the fifth state of material strip production provided in the embodiments of this application.

[0032] In the picture:

[0033] 10. Negative electrode conveying mechanism; 11. Negative electrode unwinding roller; 12. Negative electrode material strip; 13. Negative electrode coding roller; 14. Negative electrode scanning camera; 15. Negative electrode cutting part; 16. First feeding roller; 17. First rejection assembly; 171. First stop; 172. First collection component; 18. Negative electrode sheet;

[0034] 20. Unwinding roller; 21. Diaphragm; 211. Second gap; 212. First gap; 213. Rejection zone; 22. Diaphragm splice;

[0035] 30. Residual quantity inspection items;

[0036] 40. Positive electrode conveying mechanism; 41. Positive electrode unwinding roller; 42. Positive electrode strip; 43. Positive electrode coding roller; 44. Positive electrode scanning camera; 45. Positive electrode cutter; 46. Second feeding roller; 47. Second rejection assembly; 471. Second stop; 472. Second collection assembly; 48. Positive electrode sheet;

[0037] 51. First identification element; 52. Second identification element;

[0038] 61. First thermal composite roller; 62. Second thermal composite roller; 63. First drive roller; 64. Second drive roller;

[0039] 70. Cutting blade; 80. Coiling needle; 90. Receiving component; 200. Stacking mechanism; 210. Complete battery cell. Embodiments of the present invention

[0040] This embodiment provides a stacked battery cell production apparatus that can promptly detect when the subsequent separator 21 is insufficient to produce a complete battery cell 210, thus avoiding the situation where additional negative electrode 18 and positive electrode 48 are fed onto the separator 21, and preventing waste of raw materials. As shown in Figure 1, the laminated battery cell production device includes a negative electrode conveying mechanism 10, two unwinding rollers 20, two positive electrode conveying mechanisms 40, a first identification element 51, a second identification element 52, a cutter 70, a winding needle 80, and two first thermal composite rollers 61. The two unwinding rollers 20 are located on both sides of the negative electrode conveying mechanism 10. The unwinding rollers 20 are configured to unwind diaphragms 21 downstream. Each unwinding roller 20 is equipped with a residual length detection element 30, which is configured to detect the length of the remaining diaphragm 21 on the unwinding roller 20. The negative electrode conveying mechanism 10 is configured to convey negative electrode sheets 18 at different intervals between the two diaphragms 21, so as to convey the material strip downstream together with the two diaphragms 21. The residual length detection element 30 is communicatively connected to the negative electrode conveying mechanism 10. The two positive electrode conveying mechanisms 40 are located downstream of the two unwinding rollers 20, and the positive electrode conveying mechanisms 40 are configured to convey the corresponding diaphragm 21 away from the negative electrode sheet 18. A positive electrode 48 is placed on one side of the electrode 18, and the positive electrode 48s placed by the two positive electrode conveying mechanisms 40 are alternately arranged; a first identification element 51 is provided between at least one positive electrode conveying mechanism 40 and the corresponding unwinding roller 20. The first identification element 51 is configured to identify the engagement position of the unwinding roller 20 and is communicatively connected to the negative electrode conveying mechanism 10 and the positive electrode conveying mechanism 40; two first thermal composite rollers 61 are respectively located on both sides of the material strip and are configured to heat the material strip; a second identification element 52 is located downstream of the first thermal composite roller 61 and is configured to identify the gap between the two negative electrode 18s; a cutter 70 and a winding needle 80 are located downstream of the second identification element 52. The cutter 70 is communicatively connected to the second identification element 52 and can cut the material strip. The winding needle 80 can clamp the material strip and rotate. The winding needle 80 can change its upstream and downstream position relative to the cutter 70; a receiving element 90 is located downstream of the cutter 70, and the material strip with the positive electrode 48 thermally composited is stacked in the receiving element 90.

[0041] The above-mentioned stacked battery cell production apparatus, also referring to Figure 2, conveys negative electrode sheets 18 between two diaphragms 21 via a negative electrode conveying mechanism 10. During normal production, when the negative electrode conveying mechanism 10 conveys the negative electrode sheets 18, the distance between two adjacent negative electrode sheets 18 is a first interval 212. Two positive electrode conveying mechanisms 40 alternately place positive electrode sheets 48 downstream towards the side of the diaphragm 21 away from the negative electrode sheets 18. The first thermal bonding roller 61 thermally bonds the material strips together, and the material strips are stacked in the receiving unit 90 to form a battery cell. When the remaining diaphragm 21 on the unwinding roller 20 (the diaphragms 21 on the two unwinding rollers are released synchronously) is reached, When the remaining amount of diaphragm 21 is insufficient to produce a complete battery cell, the remaining amount detection device 30 sends a signal. The negative electrode conveying mechanism 10 and the positive electrode conveying mechanism 40 continue to convey the negative electrode sheet 18 and the positive electrode sheet 48 until the negative electrode conveying mechanism 10 conveys the negative electrode sheet 18 of a complete battery cell. Then, it conveys another negative electrode sheet 18 that is set at a second interval 211 from the previous negative electrode sheet 18. The entire machine is then stopped, and the two unwinding rollers 20 are spliced. The connection position of the new and old diaphragms 21 forms a diaphragm splice 22. At this time, the unwinding rollers 20 run, and the negative electrode conveying mechanism 10 and the positive electrode conveying mechanism 40 continue to operate. 40. No material is fed. When the diaphragm conveyor belt 22 passes the first identification element 51, the first identification element 51 issues a command, and the negative electrode conveying mechanism 10 starts to convey the negative electrode sheet 18. The first negative electrode sheet 18 and the second negative electrode sheet 18 are set at a second interval 211, and the subsequent adjacent negative electrode sheets 18 are set at a first interval 212. When the second interval 211 downstream of the diaphragm conveyor belt 22 passes the second identification element 52, the winding needle 80 clamps the material belt, and the cutter 70 cuts the second interval 211. The winding needle 80 moves downstream of the cutter 70 to start winding the waste rejection range 213. When the diaphragm conveyor belt... When the second interval 211 upstream of the 22 passes the second identification element 52, after a preset time, the cutter 70 cuts the second interval 211, and the winding needle 80 takes away the reject range 213. After the reject range 213 is removed, the winding needle 80 returns to the upstream of the cutter 70, and then a new cell can be stacked. Thus, when the subsequent separator 21 is insufficient, the stacked cell production device can detect it in time, stop the machine to replace the separator 21, and remove the position with the separator tape 22, avoiding the situation of feeding more negative electrode 18 and positive electrode 48 onto the separator 21, and avoiding waste of raw materials.

[0042] In some embodiments, the remaining amount detection element 30 determines the amount of remaining diaphragm 21 by detecting the thickness of the diaphragm 21 on the unwinding roller 20. In other embodiments, the remaining amount detection element 30 may also obtain the amount of remaining diaphragm 21 by other means, which are not limited here.

[0043] In some embodiments, among the multiple negative electrode pieces 18 within the same battery cell, the spacing between adjacent negative electrode pieces 18 is X1 (i.e., the first spacing 212), and the spacing between the last negative electrode piece 18 of the previous battery cell and the first negative electrode piece 18 of the next battery cell is X2 (i.e., the second spacing 211), where X2 > X1. Since the spacing between two adjacent negative electrode pieces 18 within a battery cell is already small enough, setting X2 > X1 makes it easier for the second identification element 52 to identify the electrode.

[0044] In some embodiments, the first identification element 51 is a color mark sensor, and the color of the diaphragm tape 22 is different from the color of the diaphragm 21. With the above settings, as long as the color of the diaphragm tape 22 is set to be different from the color of the diaphragm 21, the first identification element 51 can easily identify the diaphragm tape 22.

[0045] In some embodiments, as shown in FIG1, the negative electrode conveying mechanism 10 includes a negative electrode unwinding roller 11, a negative electrode coding roller 13, a negative electrode scanning camera 14, a negative electrode cutter 15, a first feeding roller 16, and a first rejection assembly 17. The negative electrode unwinding roller 11 is configured to release a continuous negative electrode strip 12; the negative electrode coding roller 13 is located downstream of the negative electrode unwinding roller 11 and is configured to print negative electrode codes on the negative electrode strip 12; the negative electrode scanning camera 14 is located downstream of the negative electrode coding roller 13 and is configured to identify negative electrode codes and defects in the negative electrode strip 12; the negative electrode cutter 15 is located downstream of the negative electrode scanning camera 14 and is configured to cut the continuous negative electrode strip... 12 is cut into individual negative electrode sheets 18; a first feeding roller 16 is located downstream of the negative electrode cutter 15 and is configured to sequentially convey the negative electrode sheets 18 downstream; a first rejection assembly 17 is located downstream of the first feeding roller 16, the first rejection assembly 17 includes a first stop 171 and a first collection 172, the first stop 171 is communicatively connected to the negative electrode scanning camera 14 and can switch between a first position and a second position, the first stop 171 in the first position allows the negative electrode sheets 18 to be transported between the two diaphragms 21, the first stop 171 in the second position blocks the negative electrode sheets 18 and forces the negative electrode sheets 18 into the first collection 172. With the above settings, the negative electrode coding roller 13 can count the number of negative electrode sheets 18 output. For example, a battery cell needs the negative electrode conveying mechanism 10 to output N negative electrode sheets 18. The number of N is counted by the negative electrode coding roller 13. When there is a defect, the corresponding negative electrode sheet 18 will enter the first stop 171 to prevent it from flowing downstream. This prevents the defective negative electrode sheet 18 from being made into a battery cell and affecting the battery cell performance. When the negative electrode coding roller 13 counts, it will subtract the number of negative electrode sheets 18 that enter the first stop 171 to ensure that the number of negative electrode sheets 18 finally made into a battery cell output by the negative electrode conveying mechanism 10 is correct.

[0046] It should be noted that the negative electrode cutting part 15 is only shown in the diagram of the cutting position. This structure is related technology and will not be described in detail here.

[0047] In some embodiments, the first rejection assembly 17 further includes a first frame (not shown) and a first rotation drive (not shown) mounted on the first frame. A first stopper 171 is plate-shaped and connected to the output end of the first rotation drive. The first rotation drive can drive the first stopper 171 to rotate and switch between a first position and a second position. With the above configuration, the first rotation drive drives the first stopper 171 to rotate, thereby achieving the switching of the first stopper 171 between the first position and the second position. The first rotation drive can be a servo motor.

[0048] In some embodiments, the positive electrode conveying mechanism 40 includes a positive electrode unwinding roller 41, a positive electrode coding roller 43, a positive electrode scanning camera 44, a positive electrode cutter 45, a second feeding roller 46, and a second rejection assembly 47. The positive electrode unwinding roller 41 is configured to release a continuous positive electrode strip 42; the positive electrode coding roller 43 is located downstream of the positive electrode unwinding roller 41 and is configured to print a positive electrode code on the positive electrode strip 42; the positive electrode scanning camera 44 is located downstream of the positive electrode coding roller 43 and is configured to identify the positive electrode code and defects in the positive electrode strip 42; the positive electrode cutter 45 is located downstream of the positive electrode scanning camera 44 and is configured to feed the continuous positive electrode strip 42 into the positive electrode strip 42. 2. Cut into individual positive electrode sheets 48; the second feeding roller 46 is located downstream of the positive electrode cutter 45 and is configured to sequentially convey the positive electrode sheets 48 downstream; the second rejection assembly 47 is located downstream of the second feeding roller 46, and the second rejection assembly 47 includes a second stop 471 and a second collector 472. The second stop 471 is communicatively connected to the positive electrode scanning camera 44 and can switch between a third position and a fourth position. In the third position, the second stop 471 allows the positive electrode sheet 48 to be placed on the diaphragm 21, and in the fourth position, the second stop 471 blocks the positive electrode sheet 48 and forces the positive electrode sheet 48 into the second collector 472. With the above settings, the positive electrode coding roller 43 can count the number of positive electrode sheets 48 output. For example, a battery cell needs the positive electrode conveying mechanism 40 to output M positive electrode sheets 48. The number of M is counted by the positive electrode coding roller 43. When there is a defect, the corresponding positive electrode sheet 48 will enter the second guide member 471 to prevent it from flowing downstream. This prevents defective positive electrode sheets 48 from being made into battery cells and affecting the performance of the battery cells. When the positive electrode coding roller 43 counts, it will subtract the number of positive electrode sheets 48 that enter the second guide member 471 to ensure that the number of positive electrode sheets 48 finally made into battery cells output downstream by the positive electrode conveying mechanism 40 is correct.

[0049] In some embodiments, the second rejection assembly 47 further includes a second frame and a second rotation drive mounted on the second frame. The second stop 471 is plate-shaped and connected to the output end of the second rotation drive. The second rotation drive can drive the second stop 471 to rotate and switch between a third position and a fourth position. With the above configuration, the second rotation drive drives the second stop 471 to rotate, thereby achieving the switching of the second stop 471 between the third and fourth positions. The second rotation drive can be a servo motor.

[0050] In some embodiments, as shown in FIG1, two second thermal bonding rollers 62 are provided upstream of the positive electrode conveying mechanism 40. The two second thermal bonding rollers 62 are configured to thermally bond the two diaphragms 21 and the negative electrode sheet 18. With the above configuration, the second thermal bonding rollers 62 first thermally bond the two diaphragms 21 and the negative electrode sheet 18 located between the two diaphragms 21. As the conveyor belt moves downstream, the first thermal bonding roller 61 thermally bonds the additional positive electrode sheet 48. Thus, each sheet is fully thermally bonded, preventing insufficient thermal bonding of the sheet by only one thermal bonding roller.

[0051] In some embodiments, a first drive roller 63 is provided upstream of the cutter 70, and a second drive roller 64 is provided downstream of the cutter 70. The winding needle 80 can stay between the cutter 70 and the first drive roller 63 or between the cutter 70 and the second drive roller 64. With this arrangement, the two drive rollers provide driving force to the material strip, preventing slippage during operation. Simultaneously, the first drive roller 63 is positioned in front of the cutter 70 to ensure the material strip is taut and easy to cut when the cutter 70 cuts it. The second drive roller 64 is positioned in front of the receiving member 90 to ensure smooth entry of the material strip into the receiving member 90.

[0052] The battery cells in the receiving part 90 are formed by stacking the material strips by the stacking mechanism 200. This part is related technology and will not be described in detail here.

[0053] This embodiment also provides a method of using the laminated battery cell production apparatus, applied to the aforementioned laminated battery cell production apparatus, as shown in Figure 3. The method of using the laminated battery cell production apparatus includes:

[0054] S10: The remaining length of the remaining diaphragm 21 on the unwinding roller 20 is detected by the remaining length of the remaining diaphragm 21 on the unwinding roller 20;

[0055] S20: Determine whether the length of the remaining separator 21 is sufficient for the use of one battery cell. If the length of the remaining separator 21 is sufficient for the use of one battery cell, execute S30. If the length of the remaining separator 21 is insufficient for the use of one battery cell, execute S40.

[0056] S30: Normal cell production, return to execute S10. See Figure 5 for the status of the entire stacked cell production unit.

[0057] S40: After the negative electrode conveying mechanism 10 conveys enough negative electrode sheets 18 for one battery cell, it conveys another negative electrode sheet 18 at the second interval 211. Both the negative electrode conveying mechanism 10 and the positive electrode conveying mechanism 40 stop conveying.

[0058] S50: The entire machine is stopped, and the two unwinding rollers 20 are rewound. The two rolls of diaphragm 21 before and after the rewound are joined together. See Figure 6 for the processes of S40 and S50.

[0059] S60: Remove the strip of negative electrode 18 that is spaced apart from the previous negative electrode 18 by a second interval 211 to the joint position;

[0060] S70: Continue cell production, then return to execution S10.

[0061] The above-mentioned method of using the stacked cell production device involves setting up a margin detection component 30 to monitor the margin of the diaphragm 21 on the unwinding roller 20 at any time. When the margin is insufficient for one cell, after the positive electrode 48 and negative electrode 18 of the previous cell are fed, one more negative electrode 18 is fed. When rejecting waste cells later, the negative electrode 18 is used as an identification mark for rejection, thus avoiding the situation of feeding more negative electrode 18 and positive electrode 48 onto the diaphragm 21 and avoiding waste of raw materials.

[0062] In some embodiments, in S30, normal cell production means that the negative electrode conveying mechanism 10 conveys the negative electrode sheet 18 between the two diaphragms 21 at a second interval 211, and then conveys a plurality of negative electrode sheets 18 at a first interval 212, while the two positive electrode conveying mechanisms 40 alternately place positive electrode sheets 48 onto the material strip, and the material strip is stacked in the receiving member 90.

[0063] As shown in Figure 4, S60 includes:

[0064] S61: The second identification element 52 identifies the second interval 211 in the two negative electrode plates 18, which means that the production of the previous cell has ended;

[0065] S62: The winding needle 80 clamps the material strip, and the cutter 70 receives the information from the second identification element 52. After the last negative electrode 18 of the previous cell passes through the cutter 70, the cutter 70 cuts the second interval 211.

[0066] S63: The coil needle 80 clamps the cut strip and moves it downstream of the cutter 70 to begin winding the waste material;

[0067] S64: After the first identification element 51 identifies the bonding position, the battery cell is produced normally and a second gap 211 is formed behind the bonding position; (S61-S66 see Figure 7)

[0068] S65: The second identification element 52 identifies the second gap 211 behind the engagement position;

[0069] S66: The spinning needle 80 stops rotating, and the cutter 70 receives information from the second identification element 52 and cuts the material strip at the second interval 211 behind the engagement position.

[0070] S67: The coil needle 80 retracts, and the operator or automatic equipment removes the waste material (waste removal range 213 in Figure 2) into the waste bin. The coil needle 80 returns to the upstream of the cutter 70. (See Figure 9 for S65-S67)

[0071] S68: Continue producing battery cells.

[0072] With the above configuration, the second identification element 52 is responsible for identifying the second interval 211 and instructing the cutter 70 and the winding needle 80 to move. During the waste removal process, the second interval 211, which is manufactured in conjunction with the negative electrode conveying mechanism 10, can accurately identify the start and end positions of the waste removal range 213, instructing the cutter 70 to cut and the winding needle 80 to collect the waste removal range 213. There are only two negative electrode sheets 18 in the waste removal range 213, which greatly reduces the waste of raw materials compared to the waste of a large number of negative electrode sheets 18 and positive electrode sheets 48. At the same time, the first identification element 51 can identify the diaphragm connector 22, which plays a role in instructing the subsequent negative electrode conveying mechanism 10 and positive electrode conveying mechanism 40 to start normal cell production again, ensuring a tight production cycle. In addition, the combined use of the second identification element 52 and the second interval 211 can also distinguish between the previous cell and the next cell during normal cell production, improving the automation of production.

[0073] It should be noted that after the second identification element 52 identifies the second interval 211, the second interval 211 still needs a certain amount of time and distance to reach the position of the cutter 70. This time and distance are automatically determined by the system in the background. In addition, between S67 and S68, S60 also includes S671: passing the material belt through the second drive roller 64, driving the material belt to continue moving downstream.

[0074] Optionally, the second identification element 52 is a charge-coupled device (CCD) camera.

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