Apparatus and method for manufacturing battery elements

Abstract

The manufacturing device of the battery element is miniaturized, and the manufacturing quality of the battery element is improved. The manufacturing apparatus includes a winding mechanism, a cutting device, an upstream chuck, a downstream chuck, a start position sensor, and a correction actuator. And the winding mechanism is used for winding the electrode plate. The cutting device cuts the electrode sheet at the boundary between the terminal part of the wound electrode sheet and the starting part of the electrode sheet wound by the winding mechanism. The upstream chuck can grip the electrode sheet at a position closer to the upstream than the cutting device. The downstream chuck can hold the electrode sheet at a position closer to the downstream than the cutting device. The downstream chuck transports the start end portion to a winding start position of the winding mechanism by gripping the start end portion and moving in a transport direction toward the winding mechanism. The starting end position sensor detects the position of the starting end portion in the width direction. The correction actuator corrects the position offset of the starting end portion relative to the winding mechanism in the width direction by adjusting the position of the downstream chuck.

Description

Technical Field

[0001] The present disclosure relates to an apparatus and a method for manufacturing a battery element formed by winding a strip-shaped electrode sheet. Background Art

[0002] Conventionally, there is a known device for manufacturing a battery element by winding a strip-shaped electrode sheet. For example, Patent Document 1 discloses a winding device for winding an electrode sheet and a separator to a predetermined length. The winding device includes a rotating body, a cutting unit, a chuck, a laser sensor, and a calibration actuator.

[0003] The rotating body winds the electrode sheet. The cutting unit includes a blade portion and a base portion. The cutting unit cuts the electrode sheet between the terminal end of the electrode sheet wound on the rotating body and the starting end of the electrode sheet to be wound next. The chuck can hold the electrode sheet at a position closer to the upstream than the cutting unit. The chuck provides the starting end of the electrode sheet to the rotating body by holding the starting end of the electrode sheet and moving it toward the rotating body. The laser sensor detects the position of the starting end of the electrode sheet. The correction actuator adjusts the position of the chuck in a manner that corrects the positional offset of the starting end of the electrode sheet relative to the rotating body in the width direction based on the detected position of the starting end of the electrode sheet.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: (Japan) Patent No. 5595309 Summary of the invention

[0007] Technical problem to be solved by the invention

[0008] In the winding device, when the electrode sheet is cut by the cutting unit, the chuck is arranged upstream of the cutting unit. Therefore, when the chuck holds the starting end and moves toward the rotating body, the blade and the base of the cutting unit move to an escape position separated from each other. The chuck passes between the blade and the base and moves to the rotating body.

[0009] In the above-mentioned winding device, the blade portion and the base portion of the cutting unit are greatly moved to their respective avoidance positions in a manner that a chuck can pass between the blade portion and the base portion. Therefore, the winding device is enlarged. In addition, since the distance between the blade portion and the base portion is large, it is difficult to align the positions of the blade portion and the base portion with each other. When the accuracy of the alignment of the blade portion and the base portion is reduced, the manufacturing quality of the battery element will decrease. The purpose of the present disclosure is to miniaturize the manufacturing device of the battery element and improve the manufacturing quality of the battery element.

[0010] Technical solutions for solving technical problems

[0011] A manufacturing device in one embodiment of the present disclosure is a manufacturing device for a battery element formed by winding a strip electrode sheet. The manufacturing device comprises: a winding mechanism, a cutting device, an upstream chuck, a downstream chuck, a starting position sensor, and a correction actuator. The winding mechanism winds the electrode sheet. The cutting device cuts the electrode sheet at the boundary between the terminal end of the wound electrode sheet and the starting end of the electrode sheet to be wound next by the winding mechanism. The upstream chuck can hold the electrode sheet at a position closer to the upstream than the cutting device. The downstream chuck can hold the electrode sheet at a position closer to the downstream than the cutting device. The downstream chuck conveys the starting end to the winding start position of the winding mechanism by holding the starting end and moving in the conveying direction toward the winding mechanism. The starting position sensor detects the position of the starting end in the width direction. The correction actuator corrects the positional offset of the starting end relative to the winding mechanism in the width direction by adjusting the position of the downstream chuck.

[0012] One method of manufacturing disclosed herein is a method of manufacturing a battery element formed by winding a strip electrode sheet. The manufacturing method has the following steps: winding the electrode sheet by a winding mechanism; cutting the electrode sheet by a cutting device at the boundary between the terminal end of the wound electrode sheet and the starting end of the electrode sheet to be wound next; holding the electrode sheet by an upstream chuck at a position closer to the upstream than the cutting device; holding the electrode sheet by a downstream chuck at a position closer to the downstream than the cutting device; conveying the starting end to the winding start position of the winding mechanism by holding the starting end by the downstream chuck and moving it in the conveying direction toward the winding mechanism; detecting the position of the starting end in the width direction; and correcting the positional offset of the starting end relative to the winding mechanism in the width direction by adjusting the position of the downstream chuck.

[0013] Effects of the Invention

[0014] According to the present disclosure, the downstream chuck holds the electrode sheet at a position closer to the downstream than the cutting device. Therefore, when the downstream chuck conveys the starting end portion to the winding mechanism, even if the cutting device does not avoid it significantly, the downstream chuck and the cutting device can be prevented from interfering. As a result, the manufacturing device of the battery element can be miniaturized and the manufacturing quality of the battery element can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram showing the structure of a battery element manufacturing apparatus.

[0016] Figure 2 It is an enlarged cross-sectional view of a portion of a battery component.

[0017] Figure 3 It is a schematic side view showing the structure of the winding mechanism and the first supply device.

[0018] Figure 4 It is a schematic plan view showing the structure of the winding mechanism and the first supply device.

[0019] Figure 5A It is a diagram showing the operation of the first supply device in the cutting step.

[0020] Figure 5B It is a diagram showing the operation of the first supply device in the cutting step.

[0021] Figure 5C It is a diagram showing the operation of the first supply device in the cutting step.

[0022] Figure 5D It is a diagram showing the operation of the first supply device in the cutting step.

[0023] Fig. 6A It is a diagram showing the operation of the first supply device in the electrode supply step.

[0024] Figure 6B It is a diagram showing the operation of the first supply device in the electrode supply step.

[0025] Figure 6C It is a diagram showing the operation of the first supply device in the electrode supply step.

[0026] Fig.6D It is a diagram showing the operation of the first supply device in the electrode supply step. DETAILED DESCRIPTION

[0027] Hereinafter, a battery element manufacturing apparatus according to an embodiment will be described with reference to the drawings. Figure 1 2 is a schematic diagram showing the structure of a manufacturing apparatus 1 for a battery element 2. In this embodiment, the battery element 2 is used, for example, for a lithium ion battery. Figure 1 As shown, the battery element 2 is formed by winding a positive electrode sheet 3, a first separator sheet 4, a negative electrode sheet 5, and a second separator sheet 6 into a cylindrical shape.

[0028] The positive electrode sheet 3 , the first separator sheet 4 , the negative electrode sheet 5 , and the second separator sheet 6 each have a belt shape. Figure 2 2 is an enlarged cross-sectional view of a portion of the battery element 2. Figure 2 As shown, the battery element 2 includes: a positive electrode sheet 3, a first diaphragm sheet 4, a negative electrode sheet 5, and a second diaphragm sheet 6 laminated on each other. The positive electrode sheet 3 and the negative electrode sheet 5 are metal thin plates coated with active materials. The first diaphragm sheet 4 and the second diaphragm sheet 6 are insulating systems such as polypropylene. In order to prevent the positive electrode sheet 3 and the negative electrode sheet 5 from short-circuiting, the first diaphragm sheet 4 and the second diaphragm sheet 6 are respectively arranged between the positive electrode sheet 3 and the negative electrode sheet 5.

[0029] like Figure 1 As shown, the manufacturing device 1 manufactures the battery element 2 by overlapping the positive electrode sheet 3, the first separator sheet 4, the negative electrode sheet 5, and the second separator sheet 6 and winding them on the winding core 7. The positive electrode sheet 3 is fed out from the positive electrode roller 8A. The positive electrode roller 8A winds the positive electrode sheet 3 into a tube. The first separator sheet 4 is fed out from the first separator roller 8B. The first separator roller 8B winds the first separator sheet 4 into a tube. The negative electrode sheet 5 is fed out from the negative electrode roller 8C. The negative electrode roller 8C winds the negative electrode sheet 5 into a tube. The second separator sheet 6 is fed out from the second separator roller 8D. The second separator roller 8D winds the second separator sheet 6 into a tube.

[0030] The manufacturing device 1 includes: a controller 10, a guide mechanism 11, a first supply device 12, a second supply device 13, and a winding mechanism 14. The controller 10 controls the manufacturing device 1. The controller 10 includes, for example, a processor and a storage device. The controller 10 controls the first supply device 12, the second supply device 13, and the winding mechanism 14 according to the stored program and data.

[0031] The guide mechanism 11 guides the positive electrode sheet 3 fed out successively from the positive electrode roller 8A to the winding mechanism 14. The guide mechanism 11 guides the first separator sheet 4 fed out successively from the first separator roller 8B to the winding mechanism 14. The guide mechanism 11 guides the negative electrode sheet 5 fed out successively from the negative electrode roller 8C to the winding mechanism 14. The guide mechanism 11 guides the second separator sheet 6 fed out successively from the second separator roller 8D to the winding mechanism 14. The positive electrode roller 8A, the first separator roller 8B, the negative electrode roller 8C, and the second separator roller 8D are supported so as to be rotatable.

[0032] The guide mechanism 11 includes a plurality of guide rollers A1-A5, B1-B4, C1-C6, and D1-D4. The plurality of guide rollers A1-A5, B1-B4, C1-C6, and D1-D4 are supported so as to be rotatable.

[0033] Guide rollers A1-A4 guide the positive electrode sheet 3 fed out successively from the positive electrode roller 8A. Guide rollers B1-B4 guide the first separator sheet 4 fed out successively from the first separator roller 8B. Guide roller A5 guides the positive electrode sheet 3 and the first separator sheet 4 to the winding mechanism 14. Guide rollers C1-C5 guide the negative electrode sheet 5 fed out successively from the negative electrode roller 8C. Guide rollers D1-D4 guide the second separator sheet 6 fed out successively from the second separator roller 8D. Guide roller C6 guides the negative electrode sheet 5 and the second separator sheet 6 to the winding mechanism 14.

[0034] It should be noted that the guide mechanism 11 includes a tension control mechanism (not shown). The tension control mechanism applies tension to the positive electrode sheet 3, the first separator sheet 4, the negative electrode sheet 5, and the second separator sheet 6. The tension control mechanism includes, for example, a dancer roller.

[0035] Figure 3 It is a schematic diagram showing the structure of the winding mechanism 14 and the first supply device 12. Figure 4 FIG. 1 is a top view of the winding mechanism 14 and the first supply device 12. Figure 3 As shown, the winding mechanism 14 includes a winding actuator 15. The winding actuator 15 includes, for example, an electric motor. Alternatively, the winding actuator 15 may include other actuators. The winding actuator 15 rotates the winding core 7 to wind the positive electrode sheet 3, the first diaphragm sheet 4, the negative electrode sheet 5, and the second diaphragm sheet 6 around the winding core 7. It should be noted that Figure 3 In the figure, the first separator sheet 4, the negative electrode sheet 5, and the second separator sheet 6 are not shown.

[0036] The first supply device 12 supplies the positive electrode sheet 3 to the winding mechanism 14. Figure 3 and Figure 4 As shown, the first supply device 12 includes: a cutting device 20, an upstream chuck 21, a downstream chuck 22, a starting position sensor 23, and a correction actuator 24. The cutting device 20 cuts the positive electrode sheet 3 at the boundary between the terminal end of the positive electrode sheet 3 wound by the winding mechanism 14 and the starting end of the positive electrode sheet 3 to be wound next by the winding mechanism 14. The cutting device 20 includes: a blade portion 30, a base portion 31, a first cutting actuator 32, and a second cutting actuator 33.

[0037] The blade portion 30 and the base portion 31 are arranged opposite to each other. The positive electrode sheet 3 extends between the blade portion 30 and the base portion 31. The blade portion 30 and the base portion 31 can move in the up and down directions respectively. The up and down directions refer to the directions perpendicular to the positive electrode sheet 3. In addition, the blade portion 30 and the base portion 31 can move in the conveying direction of the positive electrode sheet 3 and the opposite direction of the conveying direction respectively. Figure 3 As indicated by the arrow X1 , the conveying direction is from the first supply device 12 toward the winding mechanism 14 .

[0038] The first cutting actuator 32 moves the blade 30 and the base 31 to the cutting position and the escape position. The blade 30 and the base 31 cut the positive electrode sheet 3 at the cutting position. The blade 30 and the base 31 are separated from the positive electrode sheet 3 in the vertical direction at the escape position. The first cutting actuator 32 includes, for example, a motor or a cylinder.

[0039] The second cutting actuator 33 moves the blade 30 and the base 31 in the conveying direction and in the opposite direction of the conveying direction. The second cutting actuator 33 includes, for example, a motor or a cylinder. Alternatively, the first cutting actuator 32 and the second cutting actuator 33 may also include other actuators.

[0040] The upstream chuck 21 can hold the positive electrode sheet 3 at a position closer to the upstream than the cutting device 20. The upstream chuck 21 includes a pad 34, an upstream roller 35, and a chuck actuator 36. The pad 34 and the upstream roller 35 are arranged closer to the upstream than the cutting device 20. The pad 34 and the upstream roller 35 are arranged opposite to each other. The positive electrode sheet 3 extends between the pad 34 and the upstream roller 35. The pad 34 can move in the up-down direction.

[0041] The upstream roller 35 supports the positive electrode sheet 3. The upstream roller 35 is rotatably supported. The upstream roller 35 is rotatable in a positive rotation direction corresponding to the conveying direction and in a reverse rotation direction opposite to the positive rotation direction. The chuck actuator 36 moves the pad 34 to a holding position and a release position. The pad 34 and the upstream roller 35 hold the positive electrode sheet 3 at the holding position. At the release position, the pad 34 is separated from the positive electrode sheet 3 in the up and down direction. The chuck actuator 36 includes, for example, a motor or a cylinder. Alternatively, the chuck actuator 36 may also include other actuators.

[0042] The downstream chuck 22 can hold the positive electrode sheet 3 at a position closer to the downstream than the cutting device 20. The downstream chuck 22 holds the leading end of the positive electrode sheet 3 and moves in the conveying direction to convey the leading end to the winding start position of the winding mechanism 14. The downstream chuck 22 includes a pair of downstream rollers 37 and 38, a first chuck actuator 39, and a second chuck actuator 40.

[0043] A pair of downstream rollers 37, 38 are arranged closer to the downstream than the cutting device 20. A pair of downstream rollers 37, 38 are arranged opposite to each other. The positive electrode sheet 3 extends between the pair of downstream rollers 37, 38. The pair of downstream rollers 37, 38 can move in the up and down directions respectively. In addition, the pair of downstream rollers 37, 38 can move in the conveying direction and the opposite direction of the conveying direction. The pair of downstream rollers 37, 38 can be supported rotatably respectively. The pair of downstream rollers 37, 38 can each only rotate in the positive rotation direction corresponding to the conveying direction, and cannot rotate in the reverse rotation direction opposite to the positive rotation direction.

[0044] The first chuck actuator 39 moves the pair of downstream rollers 37 and 38 to a gripping position and a release position. The pair of downstream rollers 37 and 38 grip the positive electrode sheet 3 at the gripping position. The pair of downstream rollers 37 and 38 separate from the positive electrode sheet 3 in the vertical direction at the release position. The first chuck actuator 39 includes, for example, a motor or a cylinder.

[0045] The second chuck actuator 40 moves the pair of downstream rollers 37 and 38 in the conveying direction and the direction opposite to the conveying direction. The second chuck actuator 40 includes, for example, a motor or a cylinder. Alternatively, the first chuck actuator 39 and the second chuck actuator 40 may include other actuators.

[0046] The start position sensor 23 detects the position of the start end portion 3A of the positive electrode sheet 3 in the width direction. The start position sensor 23 is arranged downstream of the cutting device 20. The start position sensor 23 is arranged between the cutting device 20 and the winding mechanism 14 in the conveying direction of the positive electrode sheet 3. The start position sensor 23 is, for example, a laser displacement sensor. Alternatively, the start position sensor 23 may also be a magnetic, ultrasonic or other displacement sensor.

[0047] The correction actuator 24 corrects the positional deviation of the start end portion 3A relative to the winding mechanism 14 in the width direction by adjusting the position of the downstream chuck 22. Figure 4 As shown, the pair of downstream rollers 37 and 38 are movable in the width direction of the positive electrode sheet 3. The correction actuator 24 moves the pair of downstream rollers 37 and 38 in the width direction.

[0048] For example, Figure 4 As shown in FIG. 1 , when the starting end 3A of the positive electrode sheet 3 deviates from the positive position P1 in the width direction, the starting end position sensor 23 detects the direction and amount of the deviation. The correction actuator 24 corrects the position deviation of the starting end 3A in the width direction by moving the pair of downstream rollers 37 and 38 holding the starting end 3A in the direction opposite to the deviation direction by the amount of the deviation.

[0049] The above-mentioned actuators 15, 24, 32, 33, 36, 39, 40 and the starting position sensor 23 are connected to the controller 10 so as to be able to communicate. The controller 10 controls the actuators 15, 24, 32, 33, 36, 39, 40 respectively by sending command signals to the actuators 15, 24, 32, 33, 36, 39, 40. In addition, the controller 10 receives a detection signal indicating the amount of deviation and the direction of deviation of the starting end portion 3A from the starting position sensor 23. The controller 10 controls the correction actuator 24 based on the amount of deviation and the direction of deviation of the starting end portion 3A, thereby correcting the position deviation of the starting end portion 3A in the width direction.

[0050] The second supply device 13 has the same structure as the first supply device 12. The second supply device 13 is controlled by the controller 10 like the first supply device 12. Thus, the manufacturing device 1 manufactures the battery element 2. Next, the manufacturing process of the battery element 2 by the manufacturing device 1 will be described.

[0051] First, the leading end of the first diaphragm sheet 4 and the leading end of the second diaphragm sheet 6 are mounted on the winding core 7. Then, the winding core 7 is rotated by the winding mechanism 14, so that the first diaphragm sheet 4 and the second diaphragm sheet 6 are wound around the winding core 7.

[0052] Next, the starting end 3A of the first electrode sheet and the starting end 3A of the second electrode sheet are transported to the winding start position through the electrode supply process described later. For example, the starting end 3A of the first electrode sheet and the starting end 3A of the second electrode sheet are wound on the winding core 7 together with the first diaphragm sheet 4 and the second diaphragm sheet 6 at the winding start position, with the first diaphragm sheet 4 or the second diaphragm sheet 6 interposed therebetween. Thus, the winding process starts.

[0053] like Figure 3 As shown, in the winding process, the upstream chuck 21 and the downstream chuck 22 are respectively located at the release position. In addition, the cutting device 20 is located at the avoidance position. In this state, the manufacturing device 1 rotates the winding core 7 through the winding device, and the positive electrode sheet 3, the first diaphragm sheet 4, the negative electrode sheet 5, and the second diaphragm sheet 6 overlap each other and are wound on the winding core 7.

[0054] When the positive electrode sheet 3 and the negative electrode sheet 5 are wound to a predetermined length, the manufacturing apparatus 1 ends the winding step and starts the cutting step. In the cutting step, the rotation of the winding core 7 by the winding mechanism 14 is stopped. Figure 5A to Figure 5D FIG. 1 is a diagram showing the operation of the first supply device 12 in the cutting process. Figure 5A As shown in FIG. 1 , the downstream chuck 22 moves to the holding position. Thus, the downstream chuck 22 holds the positive electrode sheet 3 at a position closer to the downstream than the cutting device 20 .

[0055] Then, if Figure 5B As shown in FIG. 1 , the upstream chuck 21 moves to the holding position. Thus, the upstream chuck 21 holds the positive electrode sheet 3 at a position closer to the upstream than the cutting device 20. Figure 5C As shown, the cutting device 20 cuts the positive electrode sheet 3 while the positive electrode sheet 3 is held by the upstream chuck 21 and the downstream chuck 22. The cutting device 20 cuts the positive electrode sheet 3 at the boundary between the terminal end portion 3B of the positive electrode sheet 3 wound by the winding mechanism 14 and the starting end portion 3A of the positive electrode sheet 3 to be wound next.

[0056] like Figure 5D As shown, when the positive electrode sheet 3 is cut, the downstream chuck 22 moves to the release position and the cutting device 20 moves to the avoidance position. The upstream chuck 21 holds the positive electrode sheet 3 at a position closer to the upstream than the cutting device 20. Then, the winding mechanism 14 rotates the winding core 7, thereby winding the terminal portion 3B of the electrode sheet on the winding core 7. The second supply device 13 also works in the same manner as the above-mentioned first supply device 12. Thus, the battery element 2 is manufactured by winding the positive electrode sheet 3, the first diaphragm sheet 4, the negative electrode sheet 5, and the second diaphragm sheet 6 into a cylindrical shape.

[0057] When the cutting process is completed, the manufacturing device 1 replaces the winding core 7 on which the battery element 2 is wound with the next winding core 7. For example, the manufacturing device 1 has a replacement device (not shown), and the replacement device replaces the winding core 7 on which the battery element 2 is wound with the next winding core 7. As a result, the next winding core 7 is arranged on the winding mechanism 14.

[0058] Next, the manufacturing apparatus 1 starts the electrode supplying step. Figure 6A to Figure 6D 1 is a diagram showing the operation of the first supply device 12 in the electrode supply process. Fig. 6A As shown in FIG. 1 , in the electrode supply process, the cutting device 20 and the downstream chuck 22 move in the opposite direction of the conveying direction. That is, the cutting device 20 and the downstream chuck 22 move in a manner close to the upstream chuck 21. Then, as shown in FIG. Figure 6B As shown in FIG. 1 , the downstream chuck 22 moves to the holding position. Thus, the downstream chuck 22 holds the positive electrode sheet 3 at a position closer to the downstream than the cutting device 20 .

[0059] Then, if Figure 6C As shown in FIG. 1 , the upstream chuck 21 moves to the release position. As a result, the positive electrode sheet 3 is released from the grip of the upstream chuck 21. Then, as shown in FIG. Fig.6D As shown, the downstream chuck 22 moves in the conveying direction while holding the positive electrode sheet 3. At this time, the starting position sensor 23 detects the offset amount and offset direction of the starting end portion 3A in the width direction. The correction actuator 24 corrects the position offset of the starting end portion 3A in the width direction based on the offset amount and offset direction. As a result, the starting end portion 3A of the positive electrode sheet 3 is accurately provided to the winding start position.

[0060] The first electrode sheet start end 3A is wound around the winding core 7 together with the first diaphragm sheet 4 at the winding start position. At this time, the cutting device 20 moves in the conveying direction and returns to the Figure 3 The downstream chuck 22 moves to the release position and moves in the opposite direction of the conveying direction, returning to Figure 3 The position in the winding process shown in FIG. Thus, the above-mentioned winding process is started again.

[0061] The second supply device 13 also operates in the same manner as the first supply device 12 . Thus, the leading end of the second electrode sheet is supplied to the winding start position. Then, the leading end of the second electrode sheet is wound around the winding core 7 together with the second separator sheet 6 .

[0062] In the manufacturing apparatus 1 of the battery element 2 of the present embodiment described above, in the electrode supply process, the downstream chuck 22 holds the positive electrode sheet 3 at a position closer to the downstream than the cutting device 20. Therefore, when the downstream chuck 22 conveys the starting end portion 3A to the winding mechanism 14, even if the cutting device 20 does not evade significantly, it is possible to avoid interference between the downstream chuck 22 and the cutting device 20. As a result, the manufacturing apparatus 1 of the battery element 2 can be miniaturized.

[0063] For example, Figure 3 As shown, when the cutting device 20 is in the avoidance position, the distance between the blade portion 30 and the base portion 31 may also be smaller than that of the downstream chuck 22. The distance between the blade portion 30 and the base portion 31 may also be a smaller distance to the extent that the blade portion 30 does not contact the positive electrode sheet 3. Therefore, by improving the accuracy of the position alignment of the blade portion 30 and the base portion 31, the cutting quality of the positive electrode sheet 3 is improved.

[0064] In the cutting process, the cutting device 20 cuts the positive electrode sheet 3 while the positive electrode sheet 3 is held by the upstream chuck 21 and the downstream chuck 22. Therefore, the bending of the positive electrode sheet 3 during cutting can be suppressed. Thus, the cutting quality of the positive electrode sheet 3 is improved.

[0065] The starting end position sensor 23 is arranged downstream of the cutting device 20. Therefore, compared with the case where the starting end position sensor 23 is arranged upstream of the cutting device 20, the position of the starting end portion 3A in the width direction can be detected at a position close to the winding core 7. As a result, the correction accuracy of the positional deviation of the starting end portion 3A is improved.

[0066] After the cutting device 20 cuts the positive electrode sheet 3 and before the downstream chuck 22 grips the start end 3A, the cutting device 20 moves in the opposite direction of the conveying direction. This can prevent the downstream chuck 22 from interfering with the cutting device 20 and ensure the gripping amount of the positive electrode sheet 3 by the downstream chuck 22.

[0067] In the above, the effects of the manufacturing apparatus 1 of the present embodiment by the first supply device 12 have been described. However, the second supply device 13 can also provide the same effects as those by the first supply device 12 .

[0068] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the invention.

[0069] The structures of the guide mechanism 11, the first supply device 12, the second supply device 13, or the winding mechanism 14 are not limited to the above-described embodiments and may be modified. For example, the arrangement and number of guide rollers in the guide mechanism 11 are not limited to the above-described embodiments and may be modified.

[0070] In the first supply device 12, the structure of the downstream chuck 22 is not limited to the above-mentioned embodiment, and can be changed. For example, the downstream chuck 22 is not limited to a roller body, and can also be used by other components such as a pad to hold the positive electrode sheet 3. The structure of the upstream chuck 21 is not limited to the above-mentioned embodiment, and can be changed. For example, the upstream chuck 21 can also be used by other components such as a pair of roller bodies to hold the positive electrode sheet 3.

[0071] Industrial Applicability

[0072] According to the present disclosure, it is possible to reduce the size of a battery element manufacturing apparatus and improve the manufacturing quality of the battery element.

[0073] Description of Reference Numerals

[0074] 1 manufacturing device; 3 positive electrode sheet; 3B terminal portion; 3A starting portion; 14 winding mechanism; 20 cutting device; 21 upstream chuck; 22 downstream chuck; 23 starting position sensor; 24 correction actuator; 34 pad; 35 upstream roller; 37, 38 downstream rollers.

Claims

1. A manufacturing device for a battery element formed by winding a strip-shaped electrode sheet, the manufacturing device being characterized in that: A winding mechanism for winding the electrode sheet; a cutting device for cutting the electrode sheet at a boundary between a terminal end of the wound electrode sheet and a starting end of the electrode sheet to be wound next by the winding mechanism; an upstream chuck capable of holding the electrode sheet at a position more upstream than the cutting device; A downstream chuck capable of holding the electrode sheet at a position closer to the downstream than the cutting device, and conveying the starting end portion to a winding start position of the winding mechanism by holding the starting end portion and moving in a conveying direction toward the winding mechanism; A starting end position sensor, which detects the position of the starting end in the width direction; A correction actuator corrects the positional deviation of the starting end portion relative to the winding mechanism in the width direction by adjusting the position of the downstream chuck.

2. The manufacturing device according to claim 1, characterized in that The starting end position sensor is arranged downstream of the cutting device.

3. The manufacturing device according to claim 1, characterized in that The cutting device cuts the electrode sheet while the electrode sheet is held by the upstream chuck and the downstream chuck.

4. The manufacturing device according to claim 1, characterized in that The cutting device is movable in the conveying direction and in a direction opposite to the conveying direction.

5. The manufacturing device according to claim 4, characterized in that The cutting device moves in the reverse direction after cutting the electrode sheet and before the downstream chuck grips the starting end portion.

6. The manufacturing device according to claim 1, characterized in that The downstream chuck includes a pair of downstream rollers facing each other, The pair of downstream rollers can rotate only in a normal rotation direction corresponding to the conveying direction.

7. The manufacturing device according to claim 1, characterized in that The upstream chuck comprises: liner; an upstream roller disposed opposite to the pad; The upstream roller is rotatable in a normal rotation direction corresponding to the conveying direction and a reverse direction opposite to the normal rotation direction.

8. A manufacturing method for a battery element formed by winding a strip-shaped electrode sheet, the manufacturing method comprising the following steps: The electrode sheet is wound by a winding mechanism; The electrode sheet is cut by a cutting device at a boundary between a terminal end of the wound electrode sheet and a starting end of the electrode sheet to be wound next; The electrode sheet is held by an upstream chuck at a position closer to the upstream than the cutting device; The electrode sheet is held by a downstream chuck at a position closer to the downstream than the cutting device; The downstream chuck holds the starting end portion and moves the starting end portion in a conveying direction toward the winding mechanism, thereby conveying the starting end portion to a winding start position of the winding mechanism; detecting a position of the starting end portion in a width direction; By adjusting the position of the downstream chuck, the positional deviation of the starting end portion relative to the winding mechanism in the width direction is corrected.

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