Pole piece follow-up cutting equipment and winding machine

Abstract

The embodiment of the utility model provides pole piece cutting equipment and a winding machine, and relates to the field of lithium ion battery production equipment. The problems of low winding speed and unstable pole piece tension caused by pole piece cutting of the winding machine are solved. The pole piece cutting equipment comprises a guide rail, a cutter assembly, a piece feeding assembly, a first driving mechanism and a second driving mechanism, the cutter assembly is arranged on the guide rail in a sliding manner and is used for cutting off the pole piece under the condition that the cutter assembly is accelerated to be synchronously conveyed with the pole piece; the plate feeding assembly is arranged on the guide rail in a sliding manner and is used for clamping and feeding a pole plate to the cutter assembly; the first driving mechanism is connected with the sheet feeding assembly, and the second driving mechanism is connected with the cutter assembly. The winding machine comprises the pole piece cutting equipment. The cutter assembly is adopted to accelerate to be synchronous with the pole piece to cut the pole piece, the pole piece does not need to be static, a battery cell is formed at a time, the production quality is high, the product consistency is good, and the production efficiency is high.

Description

Technical Field

[0001] The utility model relates to the field of lithium ion battery production equipment, in particular to a pole piece tracking cutting device and a winding machine. Background Art

[0002] In the process of lithium battery equipment development, extreme efficiency and creating maximum value are the goals that the industry pursues unremittingly, and are also important driving forces for the development of the lithium battery industry. Therefore, how to improve the production efficiency of battery cells is an urgent matter.

[0003] When winding a battery cell, a traditional winding machine needs to stop the winding process, that is, the electrode is in a stationary state, and then the fixed position cutter cuts the electrode, and then the winding needle starts the winding process again until the entire battery cell is wound. This cutting method requires the winding needle to stop the winding process midway, which greatly reduces the production speed of the battery cell, and the stability of the electrode tension cannot be guaranteed.

[0004] There is also a kind of power lithium battery core pack production equipment. When winding the battery cell, the winding needle continues to wind the battery cell without stopping, that is, the pole piece is cut during the movement, and it does not need to be cut when the pole piece is stationary in the middle, which saves cutting time and improves the quality and production efficiency of the battery cell. However, how to ensure the cutting accuracy of the pole piece during the movement of the pole piece is the key; and when the cutter cuts the pole piece, how to reduce the tension fluctuation of the pole piece and ensure uniform tension inside the entire battery cell is also a problem. Utility Model Content

[0005] The purpose of the utility model includes, for example, providing a pole piece tracking cutting device and a winding machine, which can improve the problems of slow winding speed and unstable pole piece tension caused by pole piece cutting of the winding machine.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] An embodiment of the utility model provides a pole piece tracking cutting device, including a guide rail, a cutter assembly, a sheet feeding assembly, a first driving mechanism and a second driving mechanism; the cutter assembly is slidably arranged on the guide rail, and the cutter assembly is used to accelerate the pole piece to cut the pole piece when it is transmitted synchronously with the pole piece; the sheet feeding assembly is slidably arranged on the guide rail, and the sheet feeding assembly is located upstream of the cutter assembly, and the sheet feeding assembly is used to clamp and feed the pole piece to the cutter assembly; the first driving mechanism is connected to the sheet feeding assembly, and the first driving mechanism is used to drive the sheet feeding assembly to reciprocate along the guide rail, and the second driving mechanism is connected to the cutter assembly, and the second driving mechanism is used to drive the cutter assembly to reciprocate along the guide rail.

[0008] In addition, the pole piece tracking cutting device provided in the embodiment of the utility model may also have the following additional technical features:

[0009] Optionally, the sheet feeding assembly includes a sheet feeding base, a first one-way roller and a second one-way roller; the sheet feeding base is slidably connected to the guide rail, the first one-way roller and the second one-way roller are movably connected to the sheet feeding base, and a conveying gap with adjustable size that can pass through the electrode sheet is formed between the first one-way roller and the second one-way roller, and the first one-way roller and the second one-way roller are used for unidirectionally conveying the electrode sheet passing through the conveying gap to the cutting knife assembly.

[0010] Optionally, the sheet feeding assembly further comprises a guide block; the guide block is fixed on the sheet feeding base, and the guide block is located downstream of the first unidirectional roller and the second unidirectional roller, and the middle part of the guide block forms a guide channel for guiding the transmission of the pole piece.

[0011] Optionally, the cutter assembly includes a cutter base, a first cutter and a second cutter; the cutter base is slidably connected to the guide rail, the first cutter and the second cutter are movably arranged on the cutter base, and a cutting gap of adjustable size that can pass through the pole piece is formed between the first cutter and the second cutter, and the first cutter and the second cutter are used to cut the pole piece passing through the cutting gap when the cutting gap is reduced.

[0012] Optionally, the cutter assembly also includes a first guide plate and a second guide plate; the first guide plate and the second guide plate are fixed on the cutter base at intervals, and the first guide plate and the second guide plate are located upstream of the first cutter and the second cutter; a connected bell mouth and guide channel are formed between the first guide plate and the second guide plate in the direction from upstream to downstream, the bell mouth is used to guide the pole piece into the guide channel, and the guide channel is used to guide the pole piece into the cutting gap.

[0013] Optionally, the pole piece tracking cutting equipment also includes a sensor, a first clamping roller and a second clamping roller arranged downstream of the cutter assembly; the sensor is used to detect the edge position of the pole piece; a clamping roller channel with an adjustable size through which the pole piece can pass is formed between the first clamping roller and the second clamping roller, and the first clamping roller and the second clamping roller are used to clamp the pole piece passing through the clamping roller channel and move it to a preset position along the width direction of the pole piece.

[0014] Optionally, the first driving mechanism includes a first servo motor and a first screw rod; the first screw rod is threadedly connected to the film feeding assembly, the first servo motor is connected to the first screw rod, and the first servo motor is used to drive the first screw rod to rotate to drive the film feeding assembly to move along the guide rail.

[0015] Optionally, the second driving mechanism includes a second servo motor and a second screw rod; the second screw rod is threadedly connected to the cutter assembly, the second servo motor is connected to the second screw rod, and the second servo motor is used to drive the second screw rod to rotate to drive the cutter assembly to move along the guide rail; wherein the first screw rod and the second screw rod are arranged side by side.

[0016] Optionally, the pole piece tracking cutting device also includes a pole piece guide roller; the pole piece guide roller is arranged upstream of the sheet feeding assembly, and the pole piece guide roller is used to transfer the external pole piece to the sheet feeding assembly.

[0017] The embodiment of the utility model also provides a winding machine. The winding machine includes a winding needle and a pole piece tracking and cutting device; the number of the pole piece tracking and cutting devices is two, and the two pole piece tracking and cutting devices are arranged upstream of the winding needle, one pole piece tracking and cutting device is used to convey the positive pole piece to the winding needle, and the other pole piece tracking and cutting device is used to convey the negative pole piece to the winding needle.

[0018] The beneficial effects of the pole piece tracking cutting device and winding machine of the embodiment of the utility model include, for example:

[0019] The pole piece tracking cutting device comprises a guide rail, a cutter assembly, a sheet feeding assembly, a first driving mechanism and a second driving mechanism; the cutter assembly is slidably arranged on the guide rail, and the cutter assembly is used to accelerate the pole piece to cut the pole piece when it is transmitted synchronously with the pole piece; the sheet feeding assembly is slidably arranged on the guide rail, and the sheet feeding assembly is located upstream of the cutter assembly, and the sheet feeding assembly is used to clamp and feed the pole piece to the cutter assembly; the first driving mechanism is connected to the sheet feeding assembly, and the first driving mechanism is used to drive the sheet feeding assembly to move back and forth along the guide rail, and the second driving mechanism is connected to the cutter assembly, and the second driving mechanism is used to drive the cutter assembly to move back and forth along the guide rail.

[0020] The feeding assembly is used to feed the electrode into the cutter assembly. The cutter assembly moves in the same direction as the electrode. The electrode is cut when the cutter assembly is accelerated to a relatively stationary state synchronous with the electrode. The electrode transmission does not need to stop, which shortens the winding time. The entire battery cell can be wound in one winding action, reducing the tension fluctuation of the electrode during the entire winding process, improving the cutting accuracy and the production efficiency of the entire machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A simplified structural diagram of the pole piece tracking cutting device provided in this embodiment;

[0023] Figure 2 A simplified diagram of the operation flow of the pole piece tracking cutting equipment provided in this embodiment.

[0024] Icons: 10-pole piece tracking cutting equipment; 11-guide rail; 12-pole piece; 100-cutter assembly; 110-cutter base; 111-first cutter; 112-second cutter; 113-cutting gap; 120-first guide plate; 121-second guide plate; 122-bell mouth; 123-guide channel; 130-cutter cutting motor; 200-sheet feeding assembly; 210-sheet feeding base; 220-first one-way roller; 221-second one-way roller; 222-conveying gap; 230-guide block; 231-guide channel; 300-first driving mechanism; 310-first servo motor; 320-first screw rod; 400-second driving mechanism; 410-second servo motor; 420-second screw rod; 500-first clamping roller; 510-second clamping roller; 600-pole piece guide roller; 700-winding needle; 800-bottom plate. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Generally, the components of the embodiment of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present utility model, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present utility model.

[0029] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0030] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0031] Combine the following Figure 1 to Figure 2 The pole piece tracking cutting device 10 provided in this embodiment is described in detail.

[0032] Please refer to Figure 1 The embodiment of the utility model provides a pole piece tracking cutting device 10, including a guide rail 11, a cutter assembly 100, a sheet feeding assembly 200, a first driving mechanism 300 and a second driving mechanism 400; the cutter assembly 100 is slidably arranged on the guide rail 11, and the cutter assembly 100 is used to accelerate the pole piece 12 to cut it when it is synchronously transmitted with the pole piece 12; the sheet feeding assembly 200 is slidably arranged on the guide rail 11, and the sheet feeding assembly 200 is located upstream of the cutter assembly 100, and the sheet feeding assembly 200 is used to clamp and feed the pole piece 12 to the cutter assembly 100; the first driving mechanism 300 is connected to the sheet feeding assembly 200, and the first driving mechanism 300 is used to drive the sheet feeding assembly 200 to reciprocate along the guide rail 11, and the second driving mechanism 400 is connected to the cutter assembly 100, and the second driving mechanism 400 is used to drive the cutter assembly 100 to reciprocate along the guide rail 11.

[0033] It should be noted that the "upstream" and "downstream" mentioned in the text are based on the conveying direction of the pole piece 12. Along the conveying direction of the pole piece 12, the one relatively located in front belongs to the downstream, and the one relatively located in the rear belongs to the upstream. The pole piece 12 is transported from the upstream position to the downstream position. For example, if A is relatively located in front of B, then A is located downstream of B, and if A is located behind B, then A is located upstream of B.

[0034] The sheet feeding assembly 200 and the cutter assembly 100 share a guide rail 11, and the pole piece 12 is introduced into the sheet feeding assembly 200. The first strength mechanism drives the sheet feeding assembly 200 to feed the pole piece 12 to the cutter assembly 100. When the pole piece 12 needs to be cut, the second driving mechanism 400 drives the cutter assembly 100 to accelerate along the guide rail 11 until the speed of the cutter assembly 100 is the same as that of the pole piece 12. That is, when the cutter assembly 100 is synchronized with the pole piece 12, the cutter assembly 100 cuts the pole piece 12.

[0035] The cutter assembly 100 moves in the same direction and speed as the pole piece 12, and then cuts the pole piece 12 during a relatively static uniform motion process; the winding time is shortened, and the entire battery cell can be wound in one winding action, reducing the tension fluctuation of the pole piece 12 during the entire winding process, improving the production efficiency of the entire machine, and also improving the quality of the battery cell.

[0036] Reference Figure 1 In this embodiment, the sheet feeding assembly 200 includes a sheet feeding base 210, a first one-way roller 220 and a second one-way roller 221; the sheet feeding base 210 is slidably connected to the guide rail 11, the first one-way roller 220 and the second one-way roller 221 are movably connected to the sheet feeding base 210, and a conveying gap 222 of adjustable size that can pass through the pole piece 12 is formed between the first one-way roller 220 and the second one-way roller 221, and the first one-way roller 220 and the second one-way roller 221 are used for unidirectionally conveying the pole piece 12 passing through the conveying gap 222 to the cutter assembly 100.

[0037] The conveying gap 222 between the first one-way roller 220 and the second one-way roller 221 is reduced, and the pole piece 12 can be clamped. During the movement of the feeding base 210 along the guide rail 11, the pole piece 12 is conveyed forward, and the conveying gap 222 between the first one-way roller 220 and the second one-way roller 221 becomes larger, and the pole piece 12 is released, and the pole piece 12 can be conveyed through the conveying gap 222. The first one-way roller 220 and the second one-way roller 221 are one-way rollers, that is, they are conveyed in the direction of the cutter assembly 100 to prevent the pole piece 12 from flying backward.

[0038] Reference Figure 1 In this embodiment, the sheet feeding assembly 200 also includes a guide block 230; the guide block 230 is fixed on the sheet feeding base 210, and the guide block 230 is located downstream of the first unidirectional roller 220 and the second unidirectional roller 221, and the middle part of the guide block 230 forms a guide channel 231 for guiding the transmission of the pole piece 12.

[0039] Specifically, the guide block 230 includes a first block and a second block, the first block and the second block are fixed on the sheet feeding base 210 at intervals, and a guide channel 231 is formed between the first block and the second block; or in other embodiments, the guide channel 231 is directly opened in the middle of the guide block 230. The pole piece 12 output from the first unidirectional roller 220 and the second unidirectional roller 221 enters the guide channel 231 for further conveyance.

[0040] Reference Figure 1 In this embodiment, the cutter assembly 100 includes a cutter base 110, a first cutter 111 and a second cutter 112; the cutter base 110 is slidably connected to the guide rail 11, the first cutter 111 and the second cutter 112 are movably arranged on the cutter base 110, and a cutting gap 113 of adjustable size that can pass through the pole piece 12 is formed between the first cutter 111 and the second cutter 112, and the first cutter 111 and the second cutter 112 are used to cut the pole piece 12 passing through the cutting gap 113 when the cutting gap 113 is reduced.

[0041] When the electrode 12 needs to be cut, the first cutter 111 and the second cutter 112 move closer to each other, the cutting gap 113 becomes smaller, and the electrode 12 is cut. The first cutter 111 and the second cutter 112 move away from each other, the cutting gap 113 becomes larger, and the electrode 12 passes through the cutting gap 113 for transportation.

[0042] Specifically, the first cutter 111 is fixed in position, and the second cutter 112 approaches or moves away from the first cutter 111. When the second cutter 112 approaches the first cutter 111, the cutting gap 113 decreases, and when the second cutter 112 moves away from the first cutter 111, the cutting gap 113 increases.

[0043] Reference Figure 1 In this embodiment, the cutter assembly 100 also includes a first guide plate 120 and a second guide plate 121; the first guide plate 120 and the second guide plate 121 are fixed on the cutter base 110 at intervals, and the first guide plate 120 and the second guide plate 121 are located upstream of the first cutter 111 and the second cutter 112; a bell mouth 122 and a guide channel 123 are formed between the first guide plate 120 and the second guide plate 121 in a direction from upstream to downstream, the bell mouth 122 is used to guide the pole piece 12 into the guide channel 123, and the guide channel 123 is used to guide the pole piece 12 into the cutting gap 113.

[0044] The electrode 12 led out from the feeding assembly 200 enters the guide channel 123 from the bell mouth 122 and then enters the cutting gap 113 for transportation. The bell mouth 122 has the function of guiding the electrode 12 to enter, and the guide channel 123 is used to guide the electrode 12 to enter between the first cutter 111 and the second cutter 112.

[0045] Reference Figure 1 and Figure 2 In this embodiment, the pole piece tracking cutting device 10 also includes a sensor, a first clamping roller 500 and a second clamping roller 510 arranged downstream of the cutter assembly 100; the sensor is used to detect the edge position of the pole piece 12; a clamping roller channel with an adjustable size and capable of passing the pole piece 12 is formed between the first clamping roller 500 and the second clamping roller 510, and the first clamping roller 500 and the second clamping roller 510 are used to clamp the pole piece 12 passing through the clamping roller channel and move it to a preset position along the width direction of the pole piece 12.

[0046] When the sensor detects that the edge of the pole piece 12 moves out of the preset position, the first clamping roller 500 and the second clamping roller 510 approach each other, clamp the pole piece 12 passing through the clamping roller channel, and then move the pole piece 12 until the sensor detects that the edge of the pole piece 12 is aligned with the preset position, and the first clamping roller 500 and the second clamping roller 510 release the pole piece 12 and continue to convey the pole piece 12. The first clamping roller 500 and the second clamping roller 510 are used for deviation correction.

[0047] Reference Figure 1 In this embodiment, the first driving mechanism 300 includes a first servo motor 310 and a first screw rod 320; the first screw rod 320 is threadedly connected to the film feeding assembly 200, and the first servo motor 310 is connected to the first screw rod 320. The first servo motor 310 is used to drive the first screw rod 320 to rotate, so as to drive the film feeding assembly 200 to move along the guide rail 11.

[0048] The first servo motor 310 drives the first screw rod 320 to rotate, and the first screw rod 320 rotates to drive the film feeding assembly 200 to move. The first servo motor 310 drives the first screw rod 320 to reciprocate, and drives the film feeding assembly 200 to reciprocate along the guide rail 11. The first servo motor 310 is used, and the response speed is faster. Specifically, the first screw rod 320 is threadedly connected to the film feeding base 210.

[0049] Reference Figure 1 In this embodiment, the second driving mechanism 400 includes a second servo motor 410 and a second screw rod 420; the second screw rod 420 is threadedly connected to the cutter assembly 100, and the second servo motor 410 is connected to the second screw rod 420. The second servo motor 410 is used to drive the second screw rod 420 to rotate, so as to drive the cutter assembly 100 to move along the guide rail 11; wherein the first screw rod 320 and the second screw rod 420 are arranged side by side.

[0050] The first screw rod 320, the second screw rod 420 and the guide rail 11 are arranged side by side. The second servo motor 410 drives the second screw rod 420 to rotate, and the second screw rod 420 drives the cutter assembly 100 to move. The second servo motor 410 drives the second screw rod 420 to rotate forward and reverse, and the cutter assembly 100 reciprocates along the guide rail 11. Specifically, the second screw rod 420 and the cutter base 110 are threadedly connected.

[0051] Specifically, there are two guide rails 11, which are arranged side by side and spaced apart; the first screw rod 320 is arranged between the two guide rails 11, and the second screw rod 420 is located outside the two guide rails 11; Figure 1 The right end of the cutter base 110 extends toward the outside of the guide rail 11 so as to be threadedly connected with the second screw rod 420. The first screw rod 320 and the second screw rod 420 are driven without interfering with the guide rail 11, and are arranged side by side, which can reduce the layout space.

[0052] Reference Figure 1 In this embodiment, the pole piece cutting device 10 also includes a pole piece guide roller 600; the pole piece guide roller 600 is arranged upstream of the sheet feeding assembly 200, and the pole piece guide roller 600 is used to transfer the external pole piece 12 to the sheet feeding assembly 200.

[0053] The pole piece guide roller 600 is used to change the direction of the pole piece 12 , and introduce the pole piece 12 introduced from the outside into the feeding assembly 200 for transportation after changing its direction.

[0054] The pole piece tracking cutting device 10 also includes a bottom plate 800, and the guide rail 11, the sheet feeding assembly 200, the cutter assembly 100, the first driving mechanism 300 and the second driving mechanism 400 are all arranged on the bottom plate 800. The bottom plate 800 is arranged vertically, and the sheet feeding assembly 200 and the cutter assembly 100 are arranged on the bottom plate 800 in sequence from top to bottom.

[0055] Reference Figure 1 and Figure 2 According to a pole piece tracking cutting device 10 provided in this embodiment, the working principle of the pole piece tracking cutting device 10 is:

[0056] The second servo motor 410 drives the second screw rod 420 and then drives the cutter assembly 100 to move in the same direction as the pole piece 12. When the speed of the cutter assembly 100 is accelerated to the same speed as the pole piece 12, the two maintain a relatively static uniform speed state at this time, and the cutter assembly 100 cuts the pole piece 12 in this uniform speed motion state. This chase cutting method can prevent the pole piece 12 from being pulled off, because during the movement of the pole piece 12, if the position of the cutter is fixed, then at the moment the cutter cuts, the pole piece 12 located in front of the cutter is still moving toward the winding needle 700, and the pole piece 12 under the cutter is pressed by the cutter and cannot move forward, and may be pulled off instead of being cut off flush. Chasing the pole piece 12 can effectively prevent the pole piece 12 from being pulled off. At the same time, this chasing cutting method of the pole piece 12 does not require the winding needle 700 to stop the winding process midway. The battery cell only needs to be wound once to form, which greatly improves production efficiency.

[0057] Reference Figure 1 , Figure 1 The figure is a schematic diagram of the structure of the manipulator. The first servo motor 310 is at the top. The first servo motor 310 is connected to the first screw 320 through a coupling. The first screw 320 drives the film feeding assembly 200 to achieve reciprocating motion on the guide rail 11. The film feeding assembly 200 has two first one-way rollers 220 that can only achieve one-way rotation. The two first one-way rollers 220 are used to clamp the pole piece 12 and prevent the pole piece 12 from flying backward. Below the first servo motor 310 is the pole piece guide roller 600, which is used to change the movement direction of the pole piece 12. On the right is the second servo motor 310. The second servo motor 410 is connected to the second screw rod 420 through a coupling, and the second screw rod 420 drives the entire cutter assembly 100 to reciprocate on the guide rail 11, and the sheet feeding assembly 200 and the cutter assembly 100 are on the same guide rail 11; further down are the first guide plate 120 and the second guide plate 121, which are used to smoothly guide the pole piece 12 into the cutter; at the bottom is the cutter cutting motor 130, which is used to realize the cutting action of the first cutter 111 and the second cutter 112 on the pole piece 12.

[0058] Reference Figure 2 , action one, when winding a new battery cell, the pole piece 12 is first clamped by the first one-way roller 220 and the second one-way roller 221, the pole piece 12 head is in the cutter assembly 100, and the cutter assembly 100 is at the bottom at this time; then the first one-way roller 220 and the second one-way roller 221 clamp the pole piece 12 and move downward, and send the pole piece 12 into the first clamping roller 500 and the second clamping roller 510. Driven by the first clamping roller 500 and the second clamping roller 510, the pole piece 12 enters the winding needle 700 to start the winding process. At this time, the state is as in action two; during the winding process of the winding needle 700, the feeding assembly 200 and the cutter assembly 100 move upward to the highest point in turn, preparing for the next step of the pole piece 12 tracking cutting action. At this time, the state is as in action three; the pole piece 12 is wound for the set length under the control of the encoder. After the degree, the cutter assembly 100 starts to accelerate downward under the drive of the motor until it reaches the same speed as the pole piece 12, and the two remain relatively still and move at a uniform speed. During this uniform motion, the cutter quickly cuts off the pole piece 12 under the control of the cutter cutting motor 130, and then the entire cutter assembly 100 starts to decelerate and reaches the bottom; at the same time, during this process, the feeding assembly 200 will also move downward for a distance synchronously with the cutter assembly 100, so that when the cutter cuts off the pole piece 12, the pole piece 12 material head behind the cutting position can be fed into the cutter assembly 100 to ensure that the next time the pole piece 12 can be smoothly fed and wound. At this time, the state is as in action four; finally, after winding by the winding needle 700, a battery cell is completed, and this action process is repeated to achieve efficient production of battery cells.

[0059] The pole piece tracking cutting device 10 provided in this embodiment has at least the following advantages:

[0060] The feeding assembly 200 is used to feed the electrode 12 into the cutter assembly 100. The cutter assembly 100 moves in the same direction as the electrode 12, and then accelerates to the same speed as the transmission speed of the electrode 12. The electrode 12 is cut off in the uniform motion when the cutter and the electrode 12 are in relative stillness. The winding process does not stop, which shortens the winding time. The entire battery cell can be wound in one winding action, reducing the tension fluctuation of the electrode 12 during the entire winding process, maintaining the consistency of the tension of the electrode 12 during the winding process, and steadily improving the cutting accuracy and the production efficiency of the whole machine, while also improving the quality of the battery cell.

[0061] The embodiment of the utility model also provides a winding machine. The winding machine includes a winding needle 700 and a pole piece tracking cutting device 10; the number of pole piece tracking cutting devices 10 is two, and the two pole piece tracking cutting devices 10 are arranged upstream of the winding needle 700, one pole piece tracking cutting device 10 is used to convey the positive pole piece 12 to the winding needle 700, and the other pole piece tracking cutting device 10 is used to convey the negative pole piece 12 to the winding needle 700. It can improve the problem of slow winding speed and unstable tension of the pole piece 12 caused by cutting of the pole piece 12 of the winding machine.

[0062] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A pole piece cutting device, characterized in that: include: Guide rail (11); A cutter assembly (100), the cutter assembly (100) being slidably disposed on the guide rail (11), the cutter assembly (100) being used to accelerate the cutter assembly (100) to a state of synchronous transmission with the pole piece (12) so as to cut off the pole piece (12); a sheet feeding assembly (200), the sheet feeding assembly (200) being slidably arranged on the guide rail (11), and the sheet feeding assembly (200) being located upstream of the cutter assembly (100), and the sheet feeding assembly (200) being used for clamping and feeding the electrode sheet (12) to the cutter assembly (100); A first driving mechanism (300) and a second driving mechanism (400); the first driving mechanism (300) is connected to the sheet feeding assembly (200), and the first driving mechanism (300) is used to drive the sheet feeding assembly (200) to move back and forth along the guide rail (11); the second driving mechanism (400) is connected to the cutter assembly (100), and the second driving mechanism (400) is used to drive the cutter assembly (100) to move back and forth along the guide rail (11).

2. The pole piece cutting device according to claim 1, characterized in that: The sheet feeding assembly (200) comprises a sheet feeding base (210), a first one-way roller (220) and a second one-way roller (221); the sheet feeding base (210) is slidably connected to the guide rail (11); the first one-way roller (220) and the second one-way roller (221) are movably connected to the sheet feeding base (210); a conveying gap (222) of adjustable size capable of passing through the pole piece (12) is formed between the first one-way roller (220) and the second one-way roller (221); the first one-way roller (220) and the second one-way roller (221) are used for unidirectionally conveying the pole piece (12) passing through the conveying gap (222) to the cutter assembly (100).

3. The pole piece tracking cutting device according to claim 2 is characterized in that: The sheet feeding assembly (200) further comprises a guide block (230); the guide block (230) is fixed on the sheet feeding base (210), and the guide block (230) is located downstream of the first unidirectional roller (220) and the second unidirectional roller (221), and a guide channel (231) for guiding the transmission of the pole piece (12) is formed in the middle of the guide block (230).

4. The pole piece tracking cutting device according to claim 1, characterized in that: The cutter assembly (100) comprises a cutter base (110), a first cutter (111) and a second cutter (112); the cutter base (110) is slidably connected to the guide rail (11); the first cutter (111) and the second cutter (112) are movably arranged on the cutter base (110); a cutting gap (113) of adjustable size capable of passing through a pole piece (12) is formed between the first cutter (111) and the second cutter (112); the first cutter (111) and the second cutter (112) are used to cut the pole piece (12) passing through the cutting gap (113) when the cutting gap (113) is reduced.

5. The pole piece tracking cutting device according to claim 4 is characterized in that: The cutter assembly (100) further comprises a first guide plate (120) and a second guide plate (121); the first guide plate (120) and the second guide plate (121) are fixed on the cutter base (110) at intervals, and the first guide plate (120) and the second guide plate (121) are located upstream of the first cutter (111) and the second cutter (112); a bell mouth (122) and a guide channel (123) are formed between the first guide plate (120) and the second guide plate (121) in a direction from upstream to downstream, the bell mouth (122) is used to guide the pole piece (12) into the guide channel (123), and the guide channel (123) is used to guide the pole piece (12) into the cutting gap (113).

6. The pole piece tracking cutting device according to claim 1, characterized in that: The pole piece tracking cutting device also includes a sensor, a first clamping roller (500) and a second clamping roller (510) arranged downstream of the cutter assembly (100); the sensor is used to detect the edge position of the pole piece (12); a clamping roller channel with an adjustable size and capable of passing the pole piece (12) is formed between the first clamping roller (500) and the second clamping roller (510); the first clamping roller (500) and the second clamping roller (510) are used to clamp the pole piece (12) passing through the clamping roller channel and move to a preset position along the width direction of the pole piece (12).

7. The pole piece tracking cutting device according to any one of claims 1 to 6, characterized in that: The first driving mechanism (300) comprises a first servo motor (310) and a first screw rod (320); the first screw rod (320) is threadedly connected to the sheet feeding assembly (200), the first servo motor (310) is connected to the first screw rod (320), and the first servo motor (310) is used to drive the first screw rod (320) to rotate, so as to drive the sheet feeding assembly (200) to move along the guide rail (11).

8. The pole piece tracking cutting device according to claim 7, characterized in that: The second driving mechanism (400) comprises a second servo motor (410) and a second screw rod (420); the second screw rod (420) is threadedly connected to the cutter assembly (100), the second servo motor (410) is connected to the second screw rod (420), and the second servo motor (410) is used to drive the second screw rod (420) to rotate, so as to drive the cutter assembly (100) to move along the guide rail (11); wherein the first screw rod (320) and the second screw rod (420) are arranged side by side.

9. The pole piece tracking cutting device according to any one of claims 1 to 6, characterized in that: The pole piece tracking cutting device also includes a pole piece guide roller (600); the pole piece guide roller (600) is arranged upstream of the sheet feeding assembly (200), and the pole piece guide roller (600) is used to transfer the external pole piece (12) to the sheet feeding assembly (200).

10. A winding machine, characterized in that: The winding machine includes a winding needle (700) and a pole piece tracking and cutting device as described in any one of claims 1 to 9; the number of the pole piece tracking and cutting devices is two, and the two pole piece tracking and cutting devices are arranged upstream of the winding needle (700), one pole piece tracking and cutting device is used to convey the positive pole piece (12) to the winding needle (700), and the other pole piece tracking and cutting device is used to convey the negative pole piece (12) to the winding needle (700).

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