CN214378563U

CN214378563U - Deviation correcting device and winding equipment

Info

Publication number: CN214378563U
Application number: CN202022840834.7U
Authority: CN
Inventors: 黄雷; 杨杰
Original assignee: Ningde Amperex Technology Ltd
Current assignee: Ningde Amperex Technology Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-10-08
Anticipated expiration: 2030-11-30

Abstract

The application discloses deviation correcting device and winding equipment can solve the problem that present deviation correcting mechanism can't rectify a deviation to the final part of coiling. The deviation correcting device comprises: the vacuum adsorption roller, the air extractor and the driving device. The vacuum adsorption roller is internally provided with a cavity, and the surface of the vacuum adsorption roller is provided with a plurality of small holes communicated with the cavity. The air extractor is used for vacuumizing the cavity of the vacuum adsorption roller so that the small holes of the vacuum adsorption roller generate suction for adsorbing the pole piece. The driving device is in transmission connection with the vacuum adsorption roller and is used for driving the vacuum adsorption roller to move in the width direction of the pole piece.

Description

Deviation correcting device and winding equipment

Technical Field

The application relates to the field of battery manufacturing, in particular to a deviation correcting device and winding equipment.

Background

At present, the lithium ion battery mainly has two structural forms, one is a winding type, and the other is a stacking type. The coiled lithium ion battery has high automation degree and mature and stable process and is applied for a long time.

In the manufacturing process of the winding type lithium ion battery, a positive pole piece, a negative pole piece and an isolating film need to be continuously wound to form a naked battery cell. After the pole piece is cut by the winding ending cutter, the ending free end of the cathode pole piece is long and has no tension, so that the tail part of the winding core has position deviation in the width direction of the pole piece, and the AC OH (width difference, which expresses the fluctuation of the position difference of the pole piece in the width direction of the pole piece) is extremely poor. The current deviation rectifying mechanism can not rectify the deviation of the wound tail part and mainly depends on manual debugging to improve the consistency of AC OH of the tail part. However, the manual deviation rectifying method has the following disadvantages:

1. the timeliness is poor: manual debugging is debugging when abnormality is found by active inspection, and the AC OH value possibly becomes poor in the process;

2. poor stability: frequent fluctuation or pole piece state change and the like exist, and the AC OH value is unstable;

3. the manufacturing cost is high: the consistency of the AC OH value of the cell ending part is poor, so that the rejection rate of the cell is increased, and the manufacturing cost is increased.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a deviation correcting device and winding equipment to solve the problem that the current deviation correcting mechanism cannot correct the tail part of winding.

An embodiment of the present application provides a deviation correcting device, includes: the vacuum adsorption roller is internally provided with a cavity, and the surface of the vacuum adsorption roller is provided with a plurality of small holes communicated with the cavity; the air extractor is used for vacuumizing the cavity of the vacuum adsorption roller so as to enable the small holes of the vacuum adsorption roller to generate suction force for adsorbing the pole piece; and the driving device is in transmission connection with the vacuum adsorption roller and is used for driving the vacuum adsorption roller to move in the width direction of the pole piece.

Optionally, the deviation rectifying device further includes: and the deviation correcting controller is connected with the driving device and used for controlling the moving distance of the vacuum adsorption roller in the width direction of the pole piece through the driving device to finish the deviation correction of the position of the pole piece.

Optionally, the deviation correcting device further comprises a position sensor for detecting the current position of the pole piece, and the position sensor is connected with the deviation correcting controller.

Optionally, the vacuum adsorption roller is arranged on the conveying path of the first pole piece and close to the winding shaft of the winding device; the position sensor includes: the first position sensor is used for detecting the current position of the first pole piece at the vacuum adsorption roller; and the second position sensor is used for detecting the current position of the second pole piece at the winding shaft of the winding device.

Optionally, the first pole piece is a cathode pole piece, and the second pole piece is an anode pole piece; the position sensor is a camera; the driving device is a motor.

Optionally, the vacuum adsorption roller comprises: the roller is sleeved on the roller shaft and can rotate relative to the roller shaft; the small holes are uniformly formed along the circumference of the roller, and the cavity is formed between the roller shaft and the roller.

Optionally, on the cross section of the vacuum adsorption roller, the cavities are distributed on the upstream side of the pole piece conveying direction relative to the first diameter; the first diameter is determined by the circle center of the section of the roller and the tangent point of the transmission line of the pole piece and the roller.

Optionally, the surface of the roller shaft is provided with a groove extending along the length direction of the roller shaft, and the groove and the roller surrounding the groove surround to form the cavity.

The embodiment of the application also provides winding equipment which comprises any one of the deviation rectifying devices.

Optionally, the vacuum adsorption roller is a diaphragm backing roller of the winding device.

The utility model provides a deviation correcting device adsorbs the negative pole free end through the vacuum adsorption roller, provides tension, and drive arrangement drive vacuum adsorption roller moves the completion on the width direction of pole piece and rectifies, can solve present deviation correcting mechanism and can't rectify the problem to the final part of coiling, improves the current naked electric core manufacturing process electric core final part pole piece positional deviation and rectifies untimely, the quality of rectifying drawback such as not high.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be derived from these drawings by a person skilled in the art.

FIG. 1 is a schematic structural diagram of a deviation rectifying device according to a first embodiment of the present application;

FIG. 2 is a schematic structural diagram of a deviation rectifying device according to a second embodiment of the present application;

FIG. 3 is a schematic view of a vacuum suction roll according to an embodiment of the present application;

FIG. 4 is a schematic view of the internal structure of a vacuum suction roll according to an embodiment of the present application;

FIG. 5 is a schematic cross-sectional view of the vacuum suction roll shown in FIG. 4;

fig. 6 is a perspective view illustrating the roll shaft of fig. 4.

Detailed Description

The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following embodiments and their technical features may be combined with each other without conflict.

Referring to fig. 1, 3 and 4, an embodiment of the present application provides a deviation correcting device 1 including: the vacuum adsorption roller 10 is characterized in that a cavity 11 is formed in the vacuum adsorption roller 10, and a plurality of small holes 12 communicated with the cavity 11 are formed in the surface of the vacuum adsorption roller 10; the air extractor 20 is used for vacuumizing the cavity 11 of the vacuum adsorption roller 10 so that the small holes 12 of the vacuum adsorption roller 10 generate suction force for adsorbing the pole pieces; and the driving device 30 is in transmission connection with the vacuum adsorption roller 10 and is used for driving the vacuum adsorption roller 10 to move in the width direction of the pole piece.

Illustratively, the air extractor 20 in this embodiment is connected to the cavity 11 of the vacuum adsorption roller 10 from both ends of the vacuum adsorption roller 10 through the pipes 21, and the pole piece 60 can be adsorbed on the vacuum adsorption roller 10 by vacuumizing the cavity 11 to make the small holes 12 of the vacuum adsorption roller 10 generate the suction force for adsorbing the pole piece. The driving device 30 is connected to the vacuum suction roller 10 through a transmission mechanism such as a gear, a conveyor belt, etc., and the driving device 30 can drive the vacuum suction roller 10 to move in the width direction of the pole piece when operating. The moving direction may be moved in either direction of both sides of the vacuum adsorption roller 10 along the longitudinal direction of the vacuum adsorption roller 10. The double-headed arrow in fig. 3 shows the moving direction of the vacuum suction roller 10 during the deviation rectifying operation by the driving device 30. After the pole piece is cut by the winding ending cutter, the problem that the existing deviation correcting device cannot correct the deviation due to the fact that the free end of the ending of the cathode pole piece is long and tension-free after the pole piece is cut by the winding ending cutter is solved through vacuum adsorption in the embodiment.

Of course, the scheme of this embodiment is not limited to the deviation correction of the tail pole piece during winding, and can also be applied to the deviation correction of the whole winding process. Furthermore, the solution of the embodiment can also be widely applied to other situations that need to correct the position of the object to be conveyed during the conveying process.

Optionally, as shown in fig. 2, the deviation rectifying device 1 may further include: and the deviation rectifying controller 40 is connected with the driving device 30, and is used for controlling the moving distance of the vacuum adsorption roller 10 in the width direction of the pole piece through the driving device 30 to finish the deviation rectifying of the position of the pole piece. The deviation correction controller 40 can generate a control amount for the moving distance to control the moving distance of the vacuum adsorption roller 10 in the width direction of the pole piece, so as to automatically correct the deviation of the pole piece position.

Optionally, as shown in fig. 2, the deviation rectifying device 1 further includes a position sensor 50 for detecting the current position of the pole piece, and the position sensor 50 is connected to the deviation rectifying controller 40. The position sensor 50 can detect the current position of the pole piece and input the current position to the deviation controller 40, and the deviation controller 40 generates a control amount for the moving distance according to the current position.

In some embodiments, the position sensor 50 includes a first position sensor and a second position sensor. The first position sensor is arranged near the vacuum adsorption roller 10 and used for detecting the current position of the pole piece at the vacuum adsorption roller 10. The second position sensor is arranged near a winding shaft of the winding device and used for detecting the current position of the pole piece when winding occurs. The deviation correction controller 40 generates a control amount for the moving distance of the pole piece according to the positions of the two pole pieces.

In other embodiments, the deviation rectifying device 1 is used for rectifying the deviation of the pole piece at the winding ending part in the manufacturing process of the winding type lithium ion battery so as to improve the uniformity of the bare cell anode super-cathode. At this time, the vacuum suction roller 10 is disposed on the conveyance path of the first pole piece, for example, the cathode pole piece, and near the winding shaft of the winding device. The position sensor 50 includes a first position sensor and a second position sensor. The first position sensor is used for detecting the current position of the cathode pole piece at the vacuum adsorption roller 10; the second position sensor is used for detecting the current position of the anode pole piece at the winding shaft of the winding device. The first position sensor may be a camera that shoots against the vacuum adsorption roller 10 and the cathode pole piece; the first position sensor may be a camera for photographing the current position of the anode plate facing the winding shaft of the winding device.

In the description, the position of a pole piece or the current position of a pole piece, the current position of a first pole piece or a cathode pole piece, and the current position of a second pole piece or an anode pole piece all refer to the current position of the edge of the corresponding pole piece.

In some embodiments, the drive device 30 is a motor; the deviation controller 40 is disposed below the vacuum adsorption roll 10, and the first position sensor is integrated in the deviation controller 40. The first position sensor detects the cathode sheet edge position X1, for example, at a frequency of 1/2 ms. The second position sensor (not shown in the figure) may be a CCD camera at the winding position, and the position of the anode obtained by photographing the CCD camera at the winding position is Y1. The deviation correction controller 40 calculates, according to an average value of the AC Overhang specification T, that the target position X2 of the cathode pole piece is Y1-T/2, the deviation amount of the deviation correction is X2-X1-Y1-T/2-X1, the deviation correction coefficient K is 0.5-1.0, the actual deviation amount is K Δ X, the deviation correction controller 40 sends an electric signal, and the deviation correction motor executes the deviation correction action according to the electric signal.

When the edge position of the tail cathode pole piece is detected, deviation calculation is carried out on the edge position and the target position, deviation amount is obtained, and deviation correction and correction are carried out according to the proportion. The deviation correction coefficient, the detection period and the deviation correction action execution period determine the deviation correction response speed.

The deviation controller 40 is typically a programmable logic controller PLC.

Furthermore, the CCD camera at the winding position can also detect whether the position of the first pole piece after deviation correction meets the preset requirement or not so as to determine whether deviation correction needs to be continued or not. The utility model provides a deviation correcting device can rectify the closed loop, improves the current naked electric core manufacturing process in the partial pole piece positional deviation of electric core ending in time rectifying, the not high grade drawback of quality of rectifying.

Preferably, as shown in fig. 4, the vacuum adsorption roller 10 includes: the roller 112 is sleeved on the roller shaft 111 and can rotate relative to the roller shaft 111; a plurality of small holes 12 are uniformly arranged along the circumference of the roller 112, and the cavities 11 are arranged between the roller shaft 111 and the roller 112.

The roller 111 does not rotate and the roller 112 rotates relative to the roller 111, when some of the holes 12 of the roller 112 rotate to a position opposite to the cavities 11, the holes generate suction due to the vacuum action of the pairs 20 of suction devices on the cavities, and meanwhile, the other holes of the roller 112 which are not opposite to the cavities 11 do not generate or generate little suction. This may limit the vacuum suction to certain areas of the roller 112 rather than the full circumference of the roller 112. It will be appreciated by those skilled in the art that if the suction force is generated by the small holes in the entire area of the circumference of the roller 112, the pole piece 60 will be wound around the vacuum suction roller 10, and the transfer of the pole piece 60 will be affected.

In some embodiments, as shown in fig. 6, the surface of the roller shaft 111 is provided with grooves 13 extending in the length direction of the roller shaft 111. As shown in fig. 4, the recess 13 and the part of the roller drum 112 surrounding the recess 13 enclose a cavity 11. Optionally, the cross-section of the groove 13 is sector-shaped. The small holes of the roller 112 located above the recesses 13 will generate suction due to the action of the suction device on the cavity 20, while the remaining small holes of the roller 112 not located above the recesses 13 will generate no or very little suction.

Alternatively, as shown in fig. 4 and 5, in the cross section of the vacuum adsorption roller 10, the cavities 11 are distributed on the upstream side of the pole piece conveying direction with respect to the first diameter R of the roller cylinder 112; the first diameter R is determined by the centre of the roller 112 and the tangent point a of the line of pole pieces to the roller 112. Illustratively, as shown in fig. 4, the transfer line of the pole piece or a parallel line thereof has a tangent point a with the roller 112, and the first diameter refers to the diameter of the roller 112 passing through the center of the roller and the tangent point a. If the roll drum is rotated clockwise, the pole piece 61 is transferred from right to left, and the cavities 11 are distributed on the upstream side of the first diameter R in the direction close to the transfer direction of the pole piece, that is, the cavities 11 are distributed on the right side of the first diameter R in the cross-sectional view of the vacuum adsorption roll 10 shown in fig. 4.

Thus, after the pole piece is cut by the winding ending cutter, the ending free end length of the cathode pole piece is adsorbed on the vacuum adsorption roller 10. Due to the distribution position of the cavity 11, the tail end of the tail free end of the cathode pole piece can be adsorbed above the cavity 11, so that the pole piece 60 can be tensioned to simulate the uncut state, the winding is assisted, and the transmission and the winding of the pole piece are not influenced. Illustratively, the opening of the groove 13 in fig. 4 is preferably directed downward and rightward. Alternatively, the opening of the groove 13 is directed rightward in fig. 4. Alternatively, the opening of the groove 13 in fig. 4 is directed to the upper right.

To sum up, this application provides a new device that can be used for coiling ending deviation correcting, adsorbs the negative pole free end through the vacuum adsorption roller, provides tension to can rectify the closed loop, improve the partial pole piece positional deviation of electric core ending in the current naked electric core manufacturing process and rectify untimely, the quality of rectifying drawback such as not high.

An embodiment of the application further provides a winding device, which comprises any one of the deviation rectifying devices. The deviation correcting device can be arranged close to the winding position and used for correcting the deviation of the winding ending part.

In some embodiments, the vacuum suction roll is a diaphragm backup roll of the winding apparatus.

The application can replace the diaphragm backing roll of current winder all-in-one for the vacuum adsorption roller of this application, perhaps improves the diaphragm backing roll directly. For example, the surface of the diaphragm backing roller is processed by adopting 360-degree hollow small holes, and air exhaust devices are added at two ends of the diaphragm backing roller, so that vacuum suction is generated at the small holes on the surface of the diaphragm backing roller, the cathode pole piece is sucked when winding is finished, the cathode pole piece moves back and forth in the width direction of the cathode pole piece under the action of a motor, the relative position of a cathode and an anode is adjusted, and the effect of improving the uniformity of the size of the anode super-cathode is achieved. Further, a deviation correction controller 40 and a position sensor 50 are added, so that automatic closed-loop deviation correction is realized.

In some embodiments, the winding apparatus has a turret center roller, and the vacuum suction roller 10 of the present application may be disposed above the turret center roller 60, and if necessary, the vacuum suction roller 10 may cooperate with the turret center roller 60 to perform the function of pressing the film web.

In addition, parameter setting (winding angle control of a winding needle) needs to be perfected on vacuum time sequence setting, when a cathode pole piece is close to a diaphragm backup roller, vacuum adsorption is started, and when the cathode pole piece is empty of aluminum foil, vacuum is broken, and the empty aluminum foil is released. This application needs to consider the appropriate vacuum degree of evacuation, and the vacuum degree size can influence the vacuum adsorption effect, and then influences the effect of rectifying.

Although the application has been shown and described with respect to one or more implementations, equivalent alterations and modifications will occur to others skilled in the art based upon a reading and understanding of this specification and the annexed drawings. This application is intended to embrace all such modifications and variations and is limited only by the scope of the appended claims.

That is, the above description is only an embodiment of the present application, and not intended to limit the scope of the present application, and all equivalent structures or equivalent flow transformations made by using the contents of the specification and the drawings, such as mutual combination of technical features between various embodiments, or direct or indirect application to other related technical fields, are included in the scope of the present application.

In addition, in the description of the present application, it is to be understood that the terms "center", "both ends", "up", "down", "front", "back", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

In addition, structural elements having the same or similar characteristics may be identified by the same or different reference numerals. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The previous description is provided to enable any person skilled in the art to make and use the present application. In the foregoing description, various details have been set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

Claims

1. A deviation rectification apparatus comprising:

the vacuum adsorption roller is internally provided with a cavity, and the surface of the vacuum adsorption roller is provided with a plurality of small holes communicated with the cavity;

the air extractor is used for vacuumizing the cavity of the vacuum adsorption roller so as to enable the small holes of the vacuum adsorption roller to generate suction force for adsorbing the pole piece; and

and the driving device is in transmission connection with the vacuum adsorption roller and is used for driving the vacuum adsorption roller to move in the width direction of the pole piece.

2. The deviation rectification apparatus of claim 1, further comprising: and the deviation correcting controller is connected with the driving device and used for controlling the moving distance of the vacuum adsorption roller in the width direction of the pole piece through the driving device to finish the deviation correction of the position of the pole piece.

3. The deviation rectification device according to claim 2, wherein the deviation rectification device further comprises a position sensor for detecting the current position of the pole piece, and the position sensor is connected with the deviation rectification controller.

4. The deviation correcting device according to claim 3, wherein the vacuum adsorption roller is arranged on the conveying path of the first pole piece and close to a winding shaft of the winding device; the position sensor includes:

the first position sensor is used for detecting the current position of the first pole piece at the vacuum adsorption roller; and the second position sensor is used for detecting the current position of the second pole piece at the winding shaft of the winding device.

5. The deviation correcting device of claim 4, wherein the first pole piece is a cathode pole piece and the second pole piece is an anode pole piece; the position sensor is a camera; the driving device is a motor.

6. The deviation correcting device according to any one of claims 1 to 5, wherein the vacuum suction roller comprises: the roller is sleeved on the roller shaft and can rotate relative to the roller shaft; the small holes are uniformly formed along the circumference of the roller, and the cavity is formed between the roller shaft and the roller.

7. The deviation correcting device according to claim 6, wherein the cavities are distributed on an upstream side of the pole piece conveying direction relative to the first diameter on the cross section of the vacuum adsorption roller; the first diameter is determined by the circle center of the section of the roller and the tangent point of the transmission line of the pole piece and the roller.

8. The deviation correcting device of claim 7 wherein the surface of the roller shaft is provided with grooves extending along the length of the roller shaft, the grooves enclosing a portion of the roller around the grooves to form the cavity.

9. A winding apparatus comprising a deviation rectifying device according to any one of claims 1 to 8.

10. The winding apparatus according to claim 9, wherein the vacuum suction roll is a diaphragm backup roll of the winding apparatus.