CN116404096B - Film-making method and system - Google Patents

Abstract

The application provides a method for preparing tablets, which comprises the following steps: the roller drives the belt material to move to the cutting station along with the roller surface; cutting the strip at the cutting station by a laser device to form the pole piece; the roller drives the pole piece to move to a blanking station along with the roller surface; the blanking device receives the pole piece at the blanking station. Therefore, the pole piece is not required to be transported through a vacuum belt, so that the space occupied by the transportation and transportation of the pole piece is small, the cost is reduced, and the pole piece cannot slip along with the displacement of the roller surface, so that the pole piece is positioned accurately.

Description

A film making method and system

Technical Field

The present application relates to the technical field of battery cell processing, and in particular to a production method and system.

Background Art

Existing electrode making machines usually use hardware molds or laser technology to make pole pieces. The metal molds will have edge wear after being used for a period of time, which affects the production quality of the pole pieces and has high cost.

In the manufacturing process, after the electrode is punched, it needs to be transported and transferred by a vacuum belt, which results in a large space occupation and high cost of the process. In addition, due to the low transportation accuracy of the vacuum belt, the electrode cannot be accurately positioned.

Summary of the invention

In view of this, the present application provides a production method and system, which takes up less space and is conducive to the precise positioning of the pole piece.

In order to achieve the above objectives, this application provides the following technical solutions:

A film-making method comprising:

The roller drives the strip to move along with the roller surface to the cutting station;

The laser device performs a cutting operation on the strip material at the cutting station to form a pole piece;

The roller drives the pole piece to move along with the roller surface to the unloading station;

The unloading device receives the pole piece at the unloading station.

Optionally include:

The unloading device performs a deviation correction operation on the received pole piece.

Optionally include:

The lamination device performs lamination operation on the pole pieces after deviation correction.

Optionally include:

The unloading device is a stacking table of a stacking device. After the pole pieces are transferred from the rollers to the stacking table, the stacking operation is directly performed on the pole pieces received.

Optionally include:

The roller drives the pole piece to pass through the inspection station, the unloading station and the reject station in sequence;

The detection device performs a detection operation on the electrode piece at the detection station to determine whether the electrode piece is qualified;

The unloading device receives the qualified electrode at the unloading station;

The reject device receives the unqualified electrode pieces that are in the reject station.

Optionally include:

The laser device is provided with a plurality of devices, and performs cutting operations on the strip material of the cutting station respectively to form a plurality of pole pieces;

The roller drives the pole piece to pass through the inspection station, the unloading station and the reject station in sequence;

A plurality of detection devices are provided, and detection operations are performed on the plurality of pole pieces at the detection stations respectively to determine whether the plurality of pole pieces are qualified;

If the plurality of electrode pieces are all qualified, the unloading device receives the plurality of electrode pieces at the unloading station;

Otherwise, the reject device receives the plurality of pole pieces at the reject station.

Optionally include:

The laser device is provided with a plurality of devices, and performs cutting operations on the strip material of the cutting station respectively to form a plurality of pole pieces;

The roller drives the pole piece to pass through the inspection station, the unloading station and the reject station in sequence;

A plurality of detection devices are provided, and detection operations are performed on the plurality of pole pieces at the detection stations respectively to determine whether the plurality of pole pieces are qualified;

When any one of the plurality of electrode pieces is qualified, the unloading device receives the qualified electrode piece at the unloading station;

When any one of the plurality of electrode pieces is unqualified, the reject device takes over the unqualified electrode piece at the reject station.

Optionally, after the reject device receives the plurality of pole pieces at the reject station, it comprises:

The first vacuum belt receives the plurality of pole pieces at the reject station and transports them;

If the electrode piece is unqualified, the first vacuum belt transports the electrode piece to a waste chamber;

Otherwise, the second vacuum belt transports the electrode piece on the first vacuum belt to the good product chamber.

Optionally include:

The roller drives the strip to move to the cutting station and keeps it at the cutting station;

The laser device located at the cutting station performs a cutting operation on the strip located at the cutting station, and after the pole piece is formed, the roller continues to drive the subsequent strip displacement.

Optionally include:

The roller drives the strip to pass through the cutting station;

The laser device is synchronously displaced with the strip material located at the cutting station, and performs a cutting operation on the strip material to form the pole piece.

A film-making system, applicable to any one of the film-making methods described above, comprising:

A roller, having a roller surface for driving the pole piece and the strip to move;

A laser device, used for cutting the strip material at the cutting station to form the pole piece;

A material unloading device, used for receiving the electrode at the unloading station;

Wherein, the cutting station and the unloading station are both formed on the outer circumference or inner circumference of the roller and are arranged along the rotation direction of the roller surface.

Optionally, the roller comprises:

A sleeved fixed roller assembly and a movable roller assembly, wherein the fixed roller assembly and the movable roller assembly can rotate relative to each other;

The negative pressure channel has an inlet arranged on the peripheral surface of the movable roller assembly away from the fixed roller assembly so as to be able to adsorb the pole piece and the strip, and an outlet arranged on the fixed roller assembly.

Optionally, the movable roller assembly is sleeved on the outer circumference of the fixed roller assembly.

Optionally, the unloading device has a correction platform for performing correction operations on the pole piece.

Optionally, the laser device is fixed at the cutting station and is capable of cutting the strip held at the cutting station to form the pole piece.

Optionally, the laser device is displaceably disposed at the cutting station, and can be displaced synchronously with the strip material located at the cutting station to perform a cutting operation on the strip material to form the pole piece.

Optionally include:

A detection device, used to perform detection operations on the pole piece at the detection station;

A reject device, used for receiving the electrode at the reject station;

The inspection station and the scrap rejection station are both formed on the outer circumference or inner circumference of the roller, and the cutting station, the inspection station, the unloading station and the scrap rejection station are arranged along the rotation direction of the roller surface.

Optionally, the laser device and/or the detection device are provided in plurality.

Optionally, the waste rejection device comprises:

A first vacuum belt, used for conveying the electrode piece of the waste rejection station to the waste chamber;

A second vacuum belt, used for conveying the electrode on the first vacuum belt to a good product chamber;

Wherein, the conveying surface of the first vacuum belt faces the waste rejection station, and the conveying surface of the second vacuum belt faces the conveying surface of the first vacuum belt.

Optionally include:

A dust removal device, used for performing dust removal operation on the electrode piece at the cutting station;

and/or, a feeding device for conveying the strip material to the roller;

And/or, a guiding device is arranged between the feeding device and the roller to make the strip material fit on the roller surface.

The film making method and system provided by the present application can rotate the roller in the circumferential direction to drive the pole piece to move along the roller surface in the circumferential direction, and then drive the pole piece to pass through the cutting station and the unloading station in sequence to complete the cutting and unloading process, without the need for vacuum belt transportation, so that the space occupied by the pole piece transportation and transportation is small, which is conducive to reducing costs. Since the pole piece moves with the roller surface, there will be no slipping phenomenon, which is conducive to the precise positioning of the pole piece. When the roller drives the pole piece to rotate to the unloading station, the roller makes the pole piece separate from the negative pressure adsorption area on the roller, and then falls onto the unloading device, so that the unloading device can receive the pole piece.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

FIG. 1 is a schematic diagram of a film-making system according to some embodiments.

FIG. 2 is a front view of a roller according to some embodiments.

In the figure: 1. roller; 2. feeding device; 3. guiding device; 4. laser device; 5. dust removal device; 6. detection device; 7. unloading device; 8. waste rejection device; 11. fixed roller assembly; 12. moving roller assembly; 13. power assembly; 121. negative pressure adsorption area; 81. first vacuum belt; 82. second vacuum belt; 83. waste chamber; 84. good chamber.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

As shown in FIG. 1 and FIG. 2 , the present application embodiment provides a film making method, comprising:

The roller drives the strip to move along with the roller surface to the cutting station;

The laser device cuts the strip at the cutting station to form a pole piece;

The roller drives the pole piece to move along with the roller surface to the unloading station;

Among them, the roller 1 has a roller surface (which can be hexagonal or arc-shaped, and the roller surface can be the inner circumference of the roller or the outer circumference of the roller, depending on the specific structure of the roller), and can fix the strip and the pole piece on the roller surface. Specifically, a negative pressure adsorption area 121 is provided on the roller surface, and the negative pressure adsorption area 121 includes a plurality of vacuum holes distributed in an array, and the strip and the pole piece are adsorbed and fixed in the negative pressure adsorption area through the vacuum holes. Moreover, the roller 1 can rotate in the circumferential direction to drive the strip and the pole piece to move in the circumferential direction with the roller surface, and then drive the strip through the cutting station, and drive the pole piece through the unloading station to complete the cutting and unloading process, without the need for vacuum belt transportation, so that the space occupied by the conveying and transportation of the strip and the pole piece is small, which is conducive to reducing costs. Since the strip and the pole piece move with the roller surface, there will be no slipping phenomenon, which is conducive to accurate positioning of the pole piece.

It should be noted that after roller 1 drives the strip through the cutting station and cuts it to form a pole piece, roller 1 drives the cut pole piece to move from the cutting station to the unloading station. The cutting station and the unloading station are not limited to two adjacent stations. In this scheme, other stations can be set between the cutting station and the unloading station, but roller 1 can drive the pole piece to move from the cutting station to the unloading station. In addition, the roller can drive the strip and the pole piece to move along its roller surface. After the strip moves along the roller surface to the cutting station, the pole piece is formed, that is, the area on the roller surface and before the cutting station absorbs the strip, and the area on the roller surface after the cutting station absorbs the strip and the pole piece. Because it is continuous during operation, the roller can simultaneously transport the strip and the pole piece.

Moreover, the laser device 4 is used to emit laser and use the laser to cut the strip at the cutting station. Specifically, the laser device 4 is arranged in the spatial area on the outer side or inner side of the roller 1 and has a laser head. The cutting operation of the strip is achieved by displacement of the laser head.

The unloading device 7 receives the pole piece at the unloading station.

When roller 1 drives the electrode piece to rotate to the unloading station, roller 1 causes the electrode piece to separate from the negative pressure adsorption area 121 on roller 1 (specifically, positive pressure can be introduced into the negative pressure adsorption area 121 to push the electrode piece to separate from the negative pressure adsorption area 121), and then falls onto the unloading device 7, so that the unloading device 7 can receive the electrode piece.

In this way, the cutting station and the unloading station are both formed on the outer circumference or inner circumference of the roller 1 and are arranged along the rotation direction of the roller 1, so that the electrode sheet cut at the cutting station can be transferred to the unloading station through the rotation of the roller 1, and the unloading operation can be performed at the unloading station, which is beneficial to improving the work efficiency of the production process.

In some schemes, the unloading device performs a correction operation on the received pole piece. The unloading device 7 performs a correction operation on the received pole piece so that the position and angle of the pole piece meet the conditions required by the subsequent lamination process, so as to facilitate the direct lamination operation on the pole piece after unloading, which is beneficial to improve the efficiency of battery cell preparation. In this way, the unloading device 7 can receive the cut pole piece, and perform a correction operation on the pole piece after receiving it, so as to facilitate the direct lamination operation on the pole piece after unloading, which is beneficial to improve the efficiency of battery cell preparation, and there is no need to perform a correction operation on the pole piece on the roller 1, which can greatly simplify the structure of the roller 1 and improve the reliability of the roller 1.

After the unloading device corrects the deviation of the received electrode, the stacking device stacks the corrected electrode, thereby integrating the electrode production and the battery cell stacking together, which is conducive to reducing the transportation process of the electrode and improving work efficiency. Specifically, a stacking device is arranged downstream of the unloading device. After the electrode is corrected by the unloading device, it is transported to the stacking table of the stacking device, and then the electrode is stacked by the stacking device.

Of course, in some other schemes, the unloading device is set as a stacking table of the lamination device. After the pole piece is transferred from the roller to the stacking table, the lamination device directly performs lamination operations on the pole piece received, so that the pole piece is stacked while unloading, and then the diaphragm is separated between the stacked pole pieces to form a prototype of the battery cell. Further simplify the process of pole piece production and battery cell lamination. Specifically, the deviation correction of the pole piece can be integrated on the roller, or the parameters can be designed so that lamination can be performed without deviation correction. For example, the diameter of the roller is large enough, and the width of the pole piece is small enough, and the pole piece is close to a plane state on the roller surface of the roller. By setting the distance between the unloading device and the roller small enough, the offset generated when the pole piece is unloaded can be ignored, so that the lamination conditions can be met after the pole piece is unloaded.

Furthermore, the film-making method comprises:

Roller 1 drives the strip through the cutting station and cuts it into pole pieces, and then drives the pole pieces to pass through the inspection station, unloading station and waste rejection station in sequence;

Among them, the cutting station, the inspection station, the unloading station and the scrap rejection station are arranged in sequence along the axial direction of the roller 1, so that the rotation of the roller 1 can drive the strip through the cutting station to cut and form pole pieces, and can also drive the cut pole pieces to pass through the inspection station, the unloading station and the scrap rejection station in sequence. Here, the inspection station is located upstream of the unloading station and the scrap rejection station, so as to facilitate the sorting of the cut pole pieces through inspection to eliminate unqualified pole pieces.

The detection device 6 performs detection operation on the electrode in the detection station to determine whether the electrode is qualified;

The detection operation at least includes the size detection and defect detection of the pole piece, so that the pole piece meets the conditions required for lamination. Specifically, the detection device 6 can be set as a CCD line scanning device. Moreover, the detection device 6 can send the detection result to the controller, and the controller determines whether the pole piece is qualified. Of course, the detection device 6 can also have a controller for determining whether the pole piece is qualified.

The unloading device 7 receives the qualified pole pieces at the unloading station;

The reject device 8 receives the unqualified electrodes at the reject station.

Among them, the waste rejection device 8 is used to receive the electrode piece at the waste rejection station. When the roller 1 drives the electrode piece to rotate to the waste rejection station, the roller 1 causes the electrode piece to separate from the negative pressure adsorption area 121 on the roller surface (specifically, positive pressure can be introduced into the negative pressure adsorption area 121 to push the electrode piece to separate from the negative pressure adsorption area 121), and then fall onto the waste rejection device 8, so that the waste rejection device 8 can receive the electrode piece.

During the film making process, driven by roller 1, the cut electrode sheet is transported to the inspection station, and inspected by the inspection device 6 to determine whether the electrode sheet is qualified (that is, whether it meets the conditions required for the subsequent lamination process). If the electrode sheet is qualified, it is transported to the unloading station and received by the unloading device 7, and then transported to the lamination system. If the electrode sheet is unqualified, it is transported to the rejection station and received by the rejection device 8.

In this way, under the action of the detection device 6, the cut electrode sheets can be detected to remove unqualified electrode sheets and retain qualified electrode sheets, thereby improving the quality of the battery cells formed by subsequent lamination.

In some embodiments, the preparation method comprises:

There are multiple laser devices 4, which cut the strips at the cutting stations to form multiple pole pieces.

Among them, the number of laser devices 4 can be 2 or n, and the strip material can be cut simultaneously by multiple laser devices 4 to form multiple pole pieces respectively, which can improve the efficiency of pole piece cutting. It can be understood that the cutting station can simultaneously accommodate strip materials forming multiple pole pieces for multiple laser devices 4 to perform cutting operations.

The roller drives the pole piece to pass through the inspection station, unloading station and waste rejection station in sequence;

There are multiple detection devices 6, and they respectively perform detection operations on multiple pole pieces at the detection station to determine whether the multiple pole pieces are qualified;

Among them, the detection device 6 can be set to 2 or n, and the efficiency of pole piece detection can be improved by detecting multiple pole pieces simultaneously through multiple detection devices 6. It can be understood that multiple pole pieces can be set at the same time in the detection station for multiple detection devices 6 to perform detection operations.

It should be noted that the number of laser devices 4 and detection devices 6 remains consistent. In this way, after multiple laser devices 4 cut multiple pole pieces at the cutting station, the multiple pole pieces flow into the detection station at the same time, and then the multiple pole pieces are detected by multiple detection devices 6, thereby realizing batch production, which is conducive to improving production efficiency.

If the plurality of electrode pieces are qualified, the unloading device 7 receives the plurality of electrode pieces at the unloading station;

Otherwise, the reject device 8 receives a plurality of pole pieces at the reject station.

Among them, since multiple electrode sheets pass through the cutting station, the testing station, the unloading station and the rejection station in batches in sequence, after being cut and tested by the cutting device and the testing device 6, the unloading device 7 is still required to unload the multiple electrode sheets, and the rejection device 8 is required to reject the multiple electrode sheets. At this time, in order to prevent unqualified products from entering the subsequent stacking process, any unqualified one of the multiple electrode sheets needs to be rejected by the rejection device 8, so that all the multiple electrode sheets entering the unloading device 7 are qualified.

In this way, multiple electrode sheets pass through the cutting station, inspection station, unloading station and scrap removal station in batches, and are cut, inspected, unloaded and rejected in turn, which can greatly improve the cutting efficiency of the electrode sheets. At the same time, the above-mentioned sorting method of the detection device 6 can improve the product quality of subsequent stacking.

In some other embodiments, based on the above scheme, the difference lies in that: when any one of the multiple electrode pieces is qualified, the unloading device takes over the qualified electrode piece at the unloading station; when any one of the multiple electrode pieces is unqualified, the rejection device takes over the unqualified electrode piece at the rejection station.

During the working process, the detection device can mark the positions of qualified and unqualified electrodes. Through position determination, the status of each electrode in the unloading station (qualified or not) can be obtained, and then the qualified electrode can be screened and unloaded at the unloading station. Correspondingly, the status of each electrode in the rejection station can also be obtained, and then the unqualified electrode can be screened and unloaded at the rejection station. In this way, the sorting process of the rejection device can be omitted and the structure can be simplified.

Furthermore, after receiving the plurality of pole pieces at the rejecting station, the rejecting device 8 mentioned above comprises:

The first vacuum belt 81 receives and transports a plurality of electrodes at the reject station;

If the electrode piece is unqualified, the first vacuum belt 81 transports the electrode piece to the waste chamber 83;

Among them, the conveying surface of the first vacuum belt 81 faces the scrap rejection station, so that the electrode piece of the scrap rejection station will fall onto the first vacuum belt 81, and then be conveyed to the scrap chamber 83 by the first vacuum belt 81. Specifically, one end of the first vacuum belt 81 is opposite to the scrap rejection station, and the other end is opposite to the scrap chamber 83, so as to ensure the reliability of receiving and conveying.

Otherwise, the second vacuum belt 82 transports the electrode piece on the first vacuum belt 81 to the good product chamber 84 .

Among them, the conveying surface of the second vacuum belt 82 faces the conveying surface of the first vacuum belt 81. Specifically, the conveying surface of the first vacuum belt 81 faces upward, and the conveying surface of the second vacuum belt 82 faces downward. When the electrode piece is conveyed to the position of the first vacuum belt 81 close to the waste chamber 83, the electrode piece is adsorbed by the second vacuum belt 82 and conveyed to the good chamber 84 under the drive of the second vacuum belt 82.

During the rejection process, since any one of the multiple electrode sheets is unqualified, the multiple electrode sheets will be transferred to the rejection station for rejection operation. However, there are still qualified electrode sheets among the multiple electrode sheets. Through this solution, the qualified electrode sheets and the unqualified electrode sheets can be sorted at the rejection station to facilitate the recycling of the qualified electrode sheets.

Of course, in other schemes, it may also be that: when the electrode piece is qualified, the first vacuum belt 81 transports the electrode piece to the waste chamber 83; when the electrode piece is unqualified, the second vacuum belt 82 transports the electrode piece on the first vacuum belt 81 to the good chamber 84.

In this solution, the roller 1 can transport the pole piece in a start-stop manner, or can transport the pole piece in a continuous and uniform speed manner without starting or stopping.

In the first embodiment, the film-making method comprises:

The roller drives the strip to move to the cutting station and keeps it at the cutting station;

The laser device located at the cutting station performs cutting operations on the strip located at the cutting station, and after the pole piece is formed, the roller continues to drive the subsequent strip displacement.

At this time, roller 1 conveys the strip in a start-stop manner. When the strip is conveyed to the cutting station, roller 1 stops conveying and keeps the strip at the cutting station to facilitate the cutting operation of the laser device 4 at the cutting station. After roller 1 stops conveying the strip, the laser device 4 and the strip are both at the cutting station, and the laser device 4 cuts the strip in the transverse direction. After the laser device 4 completes the cutting operation, roller 1 continues to drive the subsequent strip to move, and then conveys the subsequent strip to the cutting station.

In this way, the cutting operation is completed while the strip is in a stationary state, which is beneficial to improving the cutting quality and reducing the complex structure required for the displacement of the laser device 4.

In the second embodiment, the film-making method comprises:

Roller 1 drives the strip through the cutting station;

The laser device 4 moves synchronously with the strip material at the cutting station and cuts the strip material to form a pole piece.

At this time, roller 1 conveys the strip at a continuous and uniform speed without starting or stopping, so that the strip moves at a uniform speed on the cutting station. At the same time, the laser device 4 needs to move according to the displacement speed of the strip on the cutting station (that is, the speed at which roller 1 rotates and conveys), so that the speed of the circumferential displacement of the laser device 4 along roller 1 is equal to the speed of the strip displacement, that is, the laser device 4 and the strip are kept in a relatively static state, so that the laser device 4 completes the cutting operation by tracking cutting.

In this way, when the laser device 4 performs the cutting operation, the roller 1 needs to be started and stopped, which is beneficial to reduce the loss caused by starting and stopping, and further improve the production efficiency.

As shown in FIG. 1-FIG 2 , an embodiment of the present application provides a film-making system, which is applicable to the film-making method in the above-mentioned embodiment, and includes a roller 1, a laser device 4 and a feeding device 7.

Roller 1 has a roller surface (which can be hexagonal or arc-shaped), and can fix the strip and the pole piece on the roller surface. Specifically, a negative pressure adsorption area is provided on the roller surface, and the negative pressure adsorption area includes a plurality of vacuum holes distributed in an array, and the strip and the pole piece are adsorbed and fixed in the negative pressure adsorption area through the vacuum holes. Moreover, roller 1 can rotate in the circumferential direction to drive the strip and the pole piece to move in the circumferential direction along with the roller surface, and then drive the strip to pass through the cutting station and cut into pole pieces, and drive the cut pole pieces to pass through the unloading station to complete the cutting and unloading process, without the need for vacuum belt transportation, so that the space occupied by the conveying and transportation of the strip and the pole piece is small, which is conducive to reducing costs. Since the pole piece moves with the roller surface, there will be no slipping phenomenon, which is conducive to accurate positioning of the pole piece.

The laser device 4 is used to emit laser and cut the strip at the cutting station by laser. Specifically, the laser device 4 is arranged in the spatial area on the outer circumference or inner circumference of the roller 1 and has a laser head. The cutting operation of the strip is realized by the displacement of the laser head.

The unloading device 7 is used to receive the electrode at the unloading station. When the roller surface drives the electrode to rotate to the unloading station, the roller 1 causes the electrode to separate from the negative pressure adsorption area 121 on the roller 1 (roller surface), and then falls onto the unloading device 7, so that the unloading device 7 can receive the electrode.

Among them, the cutting station and the unloading station are both formed on the outer circumference or inner circumference of the roller 1 and are arranged along the rotation direction of the roller surface, so that the electrode sheet cut at the cutting station can be transferred to the unloading station through the rotation of the roller surface, and the unloading operation can be performed at the unloading station, which is beneficial to improving the work efficiency of the production process.

Specifically, the unloading device has a correction platform for performing correction operations on the pole pieces. After the unloading device receives the pole pieces (the pole pieces can be directly received through the correction platform), the correction platform performs correction operations on the received pole pieces so that the position and angle of the pole pieces meet the conditions required for the subsequent stacking process, so as to facilitate the direct stacking operation of the pole pieces after unloading, which is beneficial to improving the efficiency of battery cell preparation.

In this way, the cut pole pieces can be received by the unloading device 7, and the pole pieces can be corrected after receiving them, so that the pole pieces can be directly stacked after unloading, which is beneficial to improving the efficiency of battery cell preparation. Moreover, there is no need to correct the pole pieces on the roller 1, which can greatly simplify the structure of the roller 1 and improve the reliability of the roller 1.

In this solution, the roller 1 includes a fixed roller assembly 11, a movable roller assembly 12 and a negative pressure channel.

The movable roller assembly and the fixed roller assembly are sleeved and connected, and can rotate relative to each other, so that when the fixed roller assembly is fixed to the frame, the movable roller assembly can rotate relative to the fixed roller assembly and the frame. Here, the movable roller assembly can be sleeved on the outer periphery of the fixed roller assembly so as to drive the pole piece and the strip material to rotate through the outer periphery of the movable roller assembly, or the fixed roller assembly can be sleeved on the outer periphery of the movable roller assembly so as to drive the pole piece and the strip material to rotate through the inner periphery of the movable roller assembly.

Here, the cross-sections of the fixed roller assembly 11 and the movable roller assembly 12 are both set to a circular structure (such as a circular ring structure), which is convenient for rotational connection and can make the outer circumference or inner circumference of the movable roller assembly 12 a circular arc roller surface, thereby ensuring the position accuracy and adsorption stability of the pole piece and the strip when conveying. In combination with the above embodiments, it can be known that the roller surface of the roller is used to convey the strip and the pole piece, and the roller surface can be the inner circumference of the movable roller assembly or the outer circumference of the movable roller assembly, depending on the specific structure of the roller.

The negative pressure channel has an inlet and an outlet, wherein the inlet of the negative pressure channel is arranged on the movable roller assembly 12 and on the circumferential surface away from the fixed roller assembly (when the movable roller assembly is sleeved on the outer periphery of the fixed roller assembly, the inlet of the negative pressure channel is arranged on the outer circumferential surface of the movable roller assembly, and when the fixed roller assembly is sleeved on the outer periphery of the movable roller assembly, the inlet of the negative pressure channel is arranged on the inner circumferential surface of the movable roller assembly), and the outlet is arranged on the fixed roller assembly 11. When in use, the outlet of the negative pressure channel is connected to the negative pressure device to form a negative pressure at the inlet of the negative pressure channel (that is, the circumferential surface of the movable roller assembly 12 away from the fixed roller assembly), so that the pole piece and the strip are adsorbed on the movable roller assembly 12 under the action of the negative pressure, and then the movable roller assembly 12 can drive the pole piece and the strip to rotate and transport relative to the fixed roller assembly 11, so as to facilitate laser cutting.

It should be noted that, since the strip is cut on the moving roller assembly to form the pole piece, that is, the strip is adsorbed on the area on the circumference of the moving roller assembly away from the fixed roller assembly and before the cutting, and the pole piece is adsorbed on the area on the circumference of the moving roller assembly away from the fixed roller assembly and after the cutting, and the roller is formed to convey the strip and the pole piece simultaneously due to the continuous operation. So that the inlet of the negative pressure channel can adsorb both the strip and the pole piece, so that before and after the pole piece is cut, the strip and the pole piece can be conveyed by the moving roller assembly to the corresponding station.

During the electrode production process, the electrode and the strip are conveyed and transported along the circumference of the moving roller assembly 12 away from the fixed roller assembly under the drive of the moving roller assembly 12. The cutting, testing and other processes can be completed on the circumference of the moving roller assembly 12 away from the fixed roller assembly, without the need for vacuum belt transportation, so that the space occupied by the electrode and the strip transportation and transportation is small, which is conducive to reducing costs. Moreover, the electrode and the strip are always adsorbed on the circumference of the moving roller assembly 12 away from the fixed roller assembly 11, and no slipping will occur, which is conducive to the precise positioning of the electrode. At the same time, the outlet of the negative pressure channel for adsorbing the electrode and the strip is located on the fixed roller assembly 11. Since the fixed roller assembly 11 is fixed, it is conducive to the connection of the air path or circuit, improves the stability of the structure, and avoids the situation where the air path cavity is opened in the single-layer roller alone, resulting in complicated air paths and wires (if a complex circuit is used, a slip ring mechanism may be added to ensure that there is no winding during rotation), simplifies the structure, and greatly reduces costs.

With this arrangement, the pole piece and the strip are adsorbed on the outer peripheral surface of the movable roller assembly 12 for transportation and transfer, which occupies less space and is conducive to accurate positioning of the pole piece. Moreover, the outlet of the negative pressure channel is located on the fixed roller assembly 11, which is convenient for connection and has a stable and reliable structure.

In some preferred schemes, the movable roller assembly 12 is sleeved on the outer periphery of the fixed roller assembly 11 and can rotate relative to the fixed roller assembly 11. Specifically, both ends of the fixed roller assembly 11 protrude axially to form support arms (which can be respectively divided into a first support arm and a second support arm) to ensure that the position of the fixed roller assembly 11 is relatively fixed. A power assembly 13 is provided at one end of the movable roller assembly 12, and the movable roller assembly 12 is driven to rotate relative to the fixed roller assembly 11 by the power assembly 13. For example, the power assembly 13 is set as a motor or a driving wheel.

Of course, in other schemes, the fixed roller assembly can also be sleeved on the outer periphery of the movable roller assembly, and the movable roller assembly can be rotated relative to the fixed roller assembly. Specifically, the movable roller assembly is configured as a hollow structure, and the inlet of the negative pressure channel is formed on the inner peripheral surface of the movable roller assembly (that is, the arc-shaped roller surface of the movable roller assembly on the side away from the fixed roller assembly), thereby adsorbing the pole piece and the strip on the inner peripheral surface of the movable roller assembly, and the power assembly can be sleeved on the outer periphery of the movable roller assembly, one end of the power assembly is connected to the movable roller assembly, and the other end is connected to the fixed roller assembly, so as to realize the transportation of the pole piece and the strip.

In this solution, the roller 1 can convey the strip material in a start-stop manner, or can convey the strip material in a continuous and uniform speed manner without starting or stopping.

In the first scheme, the laser device is fixed at the cutting station and can perform cutting operations on the strip held at the cutting station to form pole pieces. During the cutting process, roller 1 conveys the strip in a start-stop manner. When the strip is conveyed to the cutting station, roller 1 stops conveying and keeps the strip at the cutting station to facilitate the subsequent cutting operation by the laser device 4. After roller 1 stops conveying the strip, the laser device 4 and the strip are both at the cutting station. The laser device 4 cuts along the transverse direction of the strip. After the cutting operation of the laser device 4 is completed, roller 1 continues to drive the subsequent strip displacement, and then conveys the subsequent strip to the cutting station. In this way, the cutting operation is completed while the strip is in a stationary state, which is beneficial to improving the quality of cutting and reducing the complex structure required for the displacement of the laser device 4.

In the second solution, the laser device is displaceably arranged at the cutting station, and can be displaced synchronously with the strip material at the cutting station to perform a cutting operation on the strip material to form a pole piece. Specifically, the laser device can be arranged on a slide rail, and displacement is achieved by sliding on the slide rail. During the cutting process, roller 1 conveys the strip material in a continuous and uniform manner without starting or stopping, so that the strip material is displaced at a uniform speed on the cutting station. At the same time, the laser device 4 needs to be displaced according to the displacement speed of the strip material at the cutting station (that is, the speed at which roller 1 rotates and conveys), so that the speed of the circumferential displacement of the laser device 4 along roller 1 is equal to the speed of the strip material displacement, that is, the laser device 4 and the strip material are kept in a relatively static state, so that the laser device 4 completes the cutting operation by tracking cutting. In this way, when the laser device 4 performs the cutting operation, roller 1 does not need to be started or stopped, which is conducive to reducing the loss caused by starting and stopping, and further improving the film production efficiency.

Furthermore, the film making system includes a detection device 6 and a waste rejection device 8.

The detection device 6 is used to perform detection operations on the pole pieces at the detection station, and the detection operations at least include size detection and defect detection of the pole pieces so that the pole pieces meet the conditions required for lamination. Specifically, the detection device 6 can be set as a CCD line scanning device.

The reject device 8 is used to receive the electrode at the reject station. When the roller surface drives the electrode to rotate to the reject station, the electrode is separated from the negative pressure adsorption area 121 on the roller surface and then falls onto the reject device 8, so that the electrode is received by the reject device 8.

Among them, the inspection station and the scrap rejection station are both formed on the outer periphery or inner periphery of the roller 1 (when the movable roller assembly 12 is sleeved on the outer periphery of the fixed roller assembly 11, it is formed on the outer periphery of the movable roller assembly; when the fixed roller assembly 11 is sleeved on the outer periphery of the movable roller assembly 12, it is formed on the inner periphery of the movable roller assembly; here it is preferably formed on the outer periphery of the movable roller assembly 12), and the cutting station, inspection station, unloading station and scrap rejection station are arranged along the rotation direction of the roller surface, so that the electrode piece cut at the cutting station can be transferred to the inspection station, unloading station and scrap rejection station in sequence through the rotation of the roller surface, which is beneficial to improving the work efficiency of the film production process.

During the film making process, driven by the roller surface, the cut electrode sheets are transported to the inspection station, and inspected by the inspection device 6 to determine whether the electrode sheets are qualified (that is, whether they meet the conditions required for subsequent lamination). If the electrode sheets are qualified, they are transported to the unloading station and received by the unloading device 7, and then transported to the lamination system. If the electrode sheets are unqualified, they are transported to the rejection station and received by the rejection device 8.

In this way, under the action of the detection device 6, the cut electrode sheets can be detected to remove unqualified electrode sheets and retain qualified electrode sheets, thereby improving the quality of the battery cells formed by subsequent lamination.

It should be noted that the above-mentioned cutting station, detection station, unloading station and waste rejection station are formed on the periphery of the roller 1, including both the outer peripheral surface of the roller 1 and the spatial area corresponding to the outer peripheral surface of the roller 1 and located radially outside the outer peripheral surface. As shown in FIG1 , the position where the laser device 4 is located is the cutting station, that is, the spatial area at the eleven o'clock and twelve o'clock directions of the roller 1 is the cutting station, the position where the detection device 6 is located is the detection station, that is, the spatial area at the eight o'clock and nine o'clock directions of the roller 1 is the detection station, the position where the unloading station is located is the unloading station, that is, the spatial area at the six o'clock direction of the roller 1 is the unloading station, and the position where the waste rejection device 8 is located is the waste rejection station, that is, the spatial area at the four o'clock direction of the roller 1 is the waste rejection station. Of course, the cutting station, detection station, unloading station and waste rejection station can also be spatial positions in other directions of the roller 1, which are not specifically limited here.

In order to improve the efficiency of the cutting operation, multiple laser devices 4 are provided, specifically, they can be set to 2 or n. Multiple laser devices 4 are used to cut the strip material at the cutting station separately to form multiple pole pieces, which can improve the efficiency of pole piece cutting, or multiple laser devices 4 are used to cut the strip material at the same time to form a pole piece, which can improve the quality of pole piece cutting.

In order to improve the efficiency of the detection operation, multiple detection devices 6 are provided, specifically, they can be set to 2 or n. By using multiple detection devices 6 to detect multiple pole pieces simultaneously, the efficiency of pole piece detection can be improved, or by using multiple detection devices 6 to detect one pole piece, the quality of pole piece detection can be improved.

Among them, as shown in Figure 1, the number of laser devices 4 and detection devices 6 can be kept consistent, so that multiple laser devices 4 form multiple pole pieces after cutting the strip material at the cutting station, and the multiple pole pieces flow into the detection station at the same time, and then the multiple pole pieces are detected by multiple detection devices 6, thereby realizing batch production, which is beneficial to improving production efficiency.

The reject device 8 comprises a first vacuum belt 81 , a second vacuum belt 82 , a reject chamber 83 and a good chamber 84 . Among them, the first vacuum belt 81 is used to receive the electrode piece at the waste rejection station and transport the electrode piece to the waste chamber 83. The conveying surface of the first vacuum belt 81 faces the waste rejection station, so that the electrode piece broken through the waste rejection station will fall onto the first vacuum belt 81, and then be transported to the waste chamber 83 by the first vacuum belt 81. Specifically, one end of the first vacuum belt 81 is opposite to the waste rejection station and the other end is opposite to the waste chamber 83 to ensure the reliability of receiving and transporting; the second vacuum belt 82 is used to transport the electrode piece on the first vacuum belt 81 to the good chamber 84, and the conveying surface of the second vacuum belt 82 faces the conveying surface of the first vacuum belt 81. Specifically, the conveying surface of the first vacuum belt 81 faces upward and the conveying surface of the second vacuum belt 82 faces downward. When the electrode piece is transported to the position of the first vacuum belt 81 close to the waste chamber 83, the electrode piece is adsorbed by the second vacuum belt 82 and transported to the good chamber 84 driven by the second vacuum belt 82.

In this way, through the action of the first vacuum belt 81 and the second vacuum belt 82, the electrode pieces can be sorted. Combined with the scheme of simultaneous cutting and testing of multiple electrode pieces, when any of the multiple electrode pieces is unqualified, all of the multiple electrode pieces are transferred to the scrap rejection station, and then under the action of the scrap rejection device 8, the qualified electrode pieces and the unqualified electrode pieces among the multiple electrode pieces are sorted out, thereby achieving the reuse of good products.

Specifically, the second vacuum belt 82 is provided with a cam mechanism or a push rod mechanism for making the pole piece on the second vacuum belt 82 detach from the second vacuum belt 82 and fall into the good product chamber 84 below.

Of course, based on the above scheme, the waste rejection device may also only include the first vacuum belt and the waste chamber, which are only used for rejecting waste without sorting the electrode pieces at the waste rejection station. At this time, combined with a scheme with only one laser device and one detection device, qualified electrode pieces are only unloaded at the unloading station, and unqualified electrode pieces are only rejected at the waste rejection station, so as to realize the separate sorting of electrode pieces.

The film making system includes a dust removal device 5, which is used to perform dust removal operations on the pole piece at the cutting station, so as to remove dust on the outside of the pole piece, and further improve the dust removal effect. Specifically, the dust removal device 5 is set in a fully enclosed sealed dust removal form to perform negative pressure dust removal on the laser cutting dust, and the dust removal device 5 is provided with a light inlet, and the laser of the laser device 4 will irradiate the pole piece on the outer peripheral surface of the roller 1 through the light inlet to complete the cutting operation.

The film making system includes a feeding device 2, which is used to transport the pole piece to the roller 1. Under the action of the feeding device 2, the pole piece is pushed at a fixed length, and the roller 1 is cooperated to achieve accurate positioning of the pole piece.

The film making system includes a guiding device 3, which is arranged between the feeding device 2 and the roller 1. Through the guiding effect of the guiding device 3, the strip material can have a larger wrap angle when entering the roller 1, so that the strip material can fit on the roller surface of the roller 1, specifically, fit on the outer circumference or inner circumference of the movable roller assembly (when the movable roller assembly 12 is sleeved on the outer circumference of the fixed roller assembly 11, it fits on the outer circumference of the movable roller assembly; when the fixed roller assembly 11 is sleeved on the outer circumference of the movable roller assembly 12, it fits on the inner circumference of the movable roller assembly; here, it is preferably fitted on the outer circumference of the movable roller assembly 12).

The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and/or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and/or recombined. Such decomposition and/or recombination should be regarded as equivalent solutions of the present application.

The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present application.

The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims (13)

1. A method for manufacturing a multi-electrode sheet, characterized by comprising: The roller drives the strip to move along with the roller surface to the cutting station; The rollers are a fixed roller assembly and a movable roller assembly which are sleeved and can rotate relatively; A plurality of laser devices respectively perform cutting operations on the strip material at the cutting station to form a plurality of pole pieces; The movable roller assembly drives the plurality of pole pieces to pass through the inspection station, the unloading station and the waste rejection station in sequence; A plurality of detection devices respectively perform detection operations on the plurality of pole pieces at the detection stations to determine whether the plurality of pole pieces are qualified; If the plurality of electrode pieces are all qualified, the unloading device receives the plurality of electrode pieces at the unloading station; Otherwise, the reject device receives the plurality of pole pieces at the reject station; The unloading device performs a deviation correction operation or a lamination operation on the plurality of pole pieces received; Among them, the cutting station, the inspection station, the unloading station and the scrap rejection station are all formed on the outer peripheral surface of the movable roller assembly, and are arranged in sequence along the rotation direction of the movable roller assembly, so that the rotation of the movable roller assembly can drive the strip through the cutting station to cut and form pole pieces, and can also drive the cut pole pieces to pass through the inspection station, the unloading station and the scrap rejection station at one time. 2. The method for producing a multi-electrode sheet according to claim 1, characterized in that it comprises: The unloading device is a stacking table of a stacking device. After the pole pieces are transferred from the rollers to the stacking table, the stacking operation is directly performed on the pole pieces received. 3. The method for manufacturing multiple electrode sheets according to claim 1, characterized in that after the reject device receives the multiple electrode sheets at the reject station, it comprises: The first vacuum belt receives the plurality of pole pieces at the reject station and transports them; If the electrode piece is unqualified, the first vacuum belt transports the electrode piece to a waste chamber; Otherwise, the second vacuum belt transports the electrode piece on the first vacuum belt to the good product chamber. 4. The method for manufacturing a multi-electrode sheet according to claim 1, characterized in that it comprises: The roller drives the strip to move to the cutting station and keeps it at the cutting station; The laser device located at the cutting station performs a cutting operation on the strip located at the cutting station, and after the pole piece is formed, the roller continues to drive the subsequent strip displacement. 5. The method for manufacturing a multi-electrode sheet according to claim 1, characterized in that it comprises: The roller drives the strip to pass through the cutting station; The laser device is synchronously displaced with the strip material located at the cutting station, and performs a cutting operation on the strip material to form the pole piece. 6. A multi-electrode sheet manufacturing system, characterized in that it is applicable to the multi-electrode sheet manufacturing method according to any one of claims 1 to 5, comprising: A roller, having a roller surface for driving the pole piece and the strip to move; The roller comprises a sleeved fixed roller assembly and a movable roller assembly, and the fixed roller assembly and the movable roller assembly can rotate relative to each other; A plurality of laser devices, used for cutting the strip material at the cutting station respectively to form the plurality of pole pieces; A plurality of detection devices, used to respectively perform detection operations on the plurality of pole pieces at the detection stations; A material unloading device, used for receiving the plurality of pole pieces at the unloading station; A reject device, used for receiving the plurality of pole pieces at the reject station; The inspection station and the scrap rejection station are both formed on the outer circumference or inner circumference of the roller, and the cutting station, the inspection station, the unloading station and the scrap rejection station are arranged along the rotation direction of the roller surface. 7. The film making system according to claim 6, wherein the roller comprises: The negative pressure channel has an inlet arranged on the peripheral surface of the movable roller assembly away from the fixed roller assembly so as to be able to adsorb the pole piece and the strip, and an outlet arranged on the fixed roller assembly. 8. The film making system according to claim 7 is characterized in that the movable roller assembly is sleeved on the outer circumference of the fixed roller assembly. 9. The film production system according to claim 6 is characterized in that the unloading device has a correction platform for performing correction operations on the pole piece. 10. The production system according to claim 6, characterized in that the laser device is fixed at the cutting station and is capable of cutting the strip held at the cutting station to form the pole piece. 11. The production system according to claim 6 is characterized in that the laser device is displaceably arranged at the cutting station and can be displaced synchronously with the strip material located at the cutting station to perform a cutting operation on the strip material to form the pole piece. 12. The film production system according to claim 11, characterized in that the waste rejection device comprises: A first vacuum belt, used for conveying the electrode piece of the waste rejection station to the waste chamber; A second vacuum belt, used for conveying the electrode on the first vacuum belt to a good product chamber; Wherein, the conveying surface of the first vacuum belt faces the waste rejection station, and the conveying surface of the second vacuum belt faces the conveying surface of the first vacuum belt. 13. The film-making system according to claim 6, characterized in that it comprises: A dust removal device, used for performing dust removal operation on the electrode piece at the cutting station; and/or, a feeding device for conveying the strip material to the roller; And/or, a guiding device is arranged between the feeding device and the roller to make the strip material fit on the roller surface.