High-speed and high-efficiency PNP mechanism for preventing multiple pieces from being taken

Abstract

The invention relates to a high-speed and high-efficiency PNP mechanism for preventing multiple pieces from being taken. The high-speed and high-efficiency PNP mechanism comprises a horizontal servo sliding table, a manipulator lifting assembly I and a pole piece bending assembly, the pole piece bending assembly comprises a fixed bracket, a length adjusting plate and a pole lug adjusting plate; a plurality of vacuum chucks are mounted at the lower ends of the length adjusting plate and the tab adjusting plate; one end of the length adjusting plate is directly and rotatably connected with the fixed bracket, and the other end is indirectly connected with the fixed bracket through the bending cylinder; and the piece bending air cylinder does telescopic motion to enable the length adjusting plate to be switched back and forth between the horizontal position and the upward inclined position, so that the grabbed pole pieces are greatly bent and separated from the pole pieces on the lower layer. The pole pieces are greatly bent along the long sides of the pole pieces through the piece bending mechanism, the pole pieces which are bonded together are separated, and the larger the amplitude is, the better the effect of reducing double pieces after piece bending is achieved. The lifting adopts servo control, is accurate in control, can be in vertical shaking linkage with a cylinder bent sheet, does not occupy the effective time for taking the sheet, and can effectively improve the overall efficiency of the lamination stacking machine.

Description

Technical Field

[0001] The invention relates to the field of lithium battery pole piece assembly technology, and in particular to a high-speed and high-efficiency PNP mechanism for preventing multiple pieces from being taken out. Background Art

[0002] The core technology of Z-type stacking of lithium battery pole pieces: the positive and negative pole pieces are grabbed from the silo to the secondary positioning platform by the PNP mechanism (positive and negative electrode manipulator mechanism), and then grabbed to the stacking table by the secondary positioning platform to complete the supply of battery cell pole pieces; in addition, in the process of alternating stacking of positive and negative pole pieces, the double swing rollers above the stacking table swing left and right or the double swing rollers do not move, and the bottom stacking table moves back and forth left and right to insert the diaphragm into the positive and negative pole pieces, and finally complete the battery cell production through repeated stacking.

[0003] When the sheet-taking robot grabs the electrode in the silo to the secondary positioning platform, the electrode in the silo has a large contact surface area and a single electrode is light, which makes it very easy for the upper and lower electrodes to stick together, resulting in double stacking and loading. At present, equipment manufacturers solve the double-sheet problem mainly through the following centralized methods:

[0004] 1. A new 10-15mm pen-shaped cylinder is added between the suction plate of the film-taking robot and the mounting column. During the process of sucking the pole piece from the silo to leaving, the pen-shaped cylinder shakes up and down or uses a film-taking delay. During the process of the film-taking robot sucking the pole piece from the silo, the delay is several milliseconds. The robot is repeatedly raised and lowered 3-5 times to complete the shaking of the film, thereby reducing the probability of double sheets.

[0005] 2. The electromagnetic vibration vacuum suction cup mainly absorbs the battery cell pole pieces through the vacuum effect. The electromagnetic coil and the magnetic conductor that are powered on and off make the armature vibrate at high frequency, thereby shaking off the multiple battery cell pole pieces absorbed by the bottom of the suction cup, leaving only a single battery cell pole piece that is directly in contact with the adsorption surface.

[0006] 3. Brushes and ion wind devices are installed on both sides of the silo. When the film-taking robot sucks the electrode, there is vacuum suction between the first electrode and the suction plate, and the other two or more electrodes are often bonded to the electrode through viscosity. When the electrode is rising, the brushes on both sides peel the electrode downward to avoid the occurrence of double sheets. At the same time, the ion wind on both sides blows the electrode. When double sheets appear, gaps will be formed between the electrodes when the wind blows. Finally, under the action of the self-generated gravity of the electrode, the electrode that is not in direct contact with the vacuum suction cup at the bottom will also separate naturally, reducing the probability of double sheets of electrode.

[0007] Although the above technologies can solve the problem of material adhesion, the existing technologies still have certain defects:

[0008] 1. The cylinder shakes up and down, and the pole piece shakes and floats slightly. In addition, when stacking large-size batteries, such as 590mm or BYD blade batteries, the shaking range of a single cylinder is small, and the shaking effect is not very obvious.

[0009] 2. The repeated lifting and lowering of the servo motor takes up the tact time of the lamination process. At present, equipment manufacturers often pursue a single-channel lamination efficiency of 0.45 PCS / S, or even above 0.4 PCS / S. This sacrifice of tact time and reduction of the probability of double sheets is obviously not accepted by mainstream equipment manufacturers. At the same time, the repeated lifting and lowering of the servo motor takes a short time and a high speed. When the pole pieces are severely bonded, the double sheet problem is often difficult to completely solve;

[0010] 3. The price of electromagnetic vibration vacuum suction cup is high. During frequent use, the electromagnetic coil heats up, which can easily cause aging of internal components. Due to frequent vibration and heating aging problems, the electromagnetic vacuum suction cup is prone to wear of the internal sealing ring of the suction cup and vacuum leakage. During use, it is easy to cause insufficient adsorption force of the electrode, leading to a series of problems such as electrode ejection during rapid movement. Summary of the invention

[0011] The purpose of the present invention is to provide a high-speed and efficient PNP mechanism for preventing multiple sheet taking, aiming at improving the efficiency of taking sheets from a Z-type stacking bin to a secondary positioning platform, while preventing the possibility of double sheets in the process of taking sheets.

[0012] To this end, the present invention proposes a high-speed and efficient PNP mechanism for preventing multiple sheets from being taken, comprising a horizontal servo slide and a manipulator lifting assembly slidably connected thereto, wherein a pole piece bending assembly is provided on the manipulator lifting assembly; the pole piece in the silo is moved to the secondary positioning platform; the pole piece bending assembly comprises a fixed bracket, a length adjustment plate and a pole ear adjustment plate; the length adjustment plate and the pole ear adjustment plate are both horizontally arranged, and a plurality of vacuum suction cups for grasping the pole piece are installed at their lower ends; one end of the length adjustment plate is directly rotatably connected to the fixed bracket, and the other end is indirectly connected to the fixed bracket through a bending cylinder; the bending cylinder performs telescopic movement to switch the length adjustment plate back and forth between a horizontal position and an upwardly inclined position, so that the grasped pole piece is greatly bent and separated from the lower layer of pole piece.

[0013] As a preferred technical solution of the present application, a double-sheet sensor is provided at the bottom of the pole piece bending assembly to detect whether there are two or more pole pieces.

[0014] As a preferred technical solution of the present application, a speed regulating valve is provided on the bending cylinder.

[0015] As a preferred technical solution of the present application, an adjusting bolt is provided above the length adjustment plate, and the adjusting bolt is connected to the fixing bracket and can move up and down.

[0016] As a preferred technical solution of the present application, the vacuum suction cup is connected to the vacuum generator through an air distributor block.

[0017] As a preferred technical solution of the present application, the length adjustment plate is equipped with a pair of vacuum suction cups through a suction cup fixing bracket; and the length adjustment plate is provided with a waist-shaped groove extending along the length direction, and the suction cup fixing bracket is slidably installed in the waist-shaped groove through a fastener.

[0018] As a preferred technical solution of the present application, a waist-shaped groove II extending along the length direction is provided on the tab adjustment plate at the other end of the fixed bracket in the length direction.

[0019] As a preferred technical solution of the present application, the pole piece bending assembly is also provided with a width adjustment plate for installing the vacuum suction cup, and the width adjustment plate is provided with a waist-shaped groove three extending along the width direction.

[0020] As a preferred technical solution of the present application, a manipulator lifting assembly 2 and a pole piece suction plate assembly are also installed on the horizontal servo slide, and the pole piece suction plate assembly moves the pole piece on the secondary positioning platform to the stacking platform.

[0021] As a preferred technical solution of the present application, the horizontal servo slide, the manipulator lifting assembly 2, the pole piece suction plate assembly, the manipulator lifting assembly 1 and the pole piece bending assembly are each provided with two groups and are symmetrically distributed; one group is responsible for the grasping and Z-shaped stacking of the positive pole piece; the other group is responsible for the grasping and Z-shaped stacking of the negative pole piece.

[0022] The invention provides a high-speed and efficient PNP mechanism for preventing multiple sheet removal. The bending mechanism greatly bends the pole piece along the long side of the pole piece to separate the pole pieces bonded together. The larger the amplitude, the better the effect of reducing double sheets after bending. The lifting adopts servo control, which is precisely controlled and can be linked with the up and down shaking of the cylinder bending piece, which does not occupy the effective time for taking the piece and can effectively improve the overall efficiency of the stacking machine.

[0023] The double sheet sensor can detect whether there are two or more pole pieces, which improves accuracy. The cylinder speed regulating valve is used to adjust the frequency of the cylinder bending the pole piece; by adjusting the adjusting bolt, the cylinder stroke is changed, and then the shaking amplitude of the bending mechanism is adjusted. By designing the length adjustment plate and width adjustment plate with adjustable width and length, it can adapt to the production of different types of battery cells, with fast changeover speed and low cost.

[0024] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0026] Figure 1 A top view of the high-speed and high-efficiency PNP mechanism for preventing multiple sheet taking of the present invention;

[0027] Figure 2 It is a front view of the bending sheet assembly in the PNP mechanism for preventing multiple sheet taking at high speed and high efficiency of the present invention;

[0028] Figure 3 It is a top view of the pole piece bending assembly in the PNP mechanism for preventing multiple pieces from being taken at a high speed and with high efficiency of the present invention;

[0029] Description of Reference Numerals

[0030] 1. Horizontal servo slide; 2. Manipulator lifting assembly 2; 3. Pole piece suction plate assembly; 4. Manipulator lifting assembly 1; 5. Pole piece bending assembly; 11. Vacuum air pressure regulating valve; 12. Air distributor block; 13. Bending cylinder; 14. Double sheet sensor; 15. Speed ​​regulating valve; 16. Adjusting bolt; 17. Vacuum suction cup; 18. Pole piece; 19. Length adjustment plate; 20. Suction cup fixing bracket; 21. Width adjustment plate; 22. Pole ear adjustment plate. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] like Figure 1 to Figure 3 As shown, the high-speed and efficient PNP mechanism for preventing multiple sheet taking of the present invention comprises: a horizontal servo slide 1, a manipulator lifting assembly 2, a pole piece suction plate assembly 3, a manipulator lifting assembly 1 4 and a pole piece bending assembly 5; the pole piece suction plate assembly 3 is connected to the manipulator lifting assembly 2, the pole piece bending assembly 5 is connected to the manipulator lifting assembly 1 4, the manipulator lifting assembly 2 2 and the manipulator lifting assembly 1 4 are respectively connected to the horizontal servo slide 1, and the horizontal servo slide 1 is installed on the equipment plate, so that the pole piece 18 moves horizontally between the silo, the secondary positioning platform and the stacking platform.

[0033] Among them, the horizontal servo slide 1, the manipulator lifting assembly 2, the pole piece suction plate assembly 3, the manipulator lifting assembly 1 4 and the pole piece bending assembly 5 are each provided with two groups, and are symmetrically distributed; one group of pole piece bending assembly 5 and the pole piece suction plate assembly 3 are used to grab and Z-shape stack the positive pole pieces; the other group of pole piece bending assembly 5 and the pole piece suction plate assembly 3 are used to grab and Z-shape stack the negative pole pieces.

[0034] Specifically, Figure 2 , Figure 3 As shown, the pole piece bending assembly 5 includes a fixed bracket, a length adjustment plate 19, a suction cup fixed bracket 20, a width adjustment plate 21, a pole ear adjustment plate 22, a bending cylinder 13, and a vacuum suction cup 17. The length adjustment plate 19, the width adjustment plate 21, and the pole ear adjustment plate 22 are all arranged horizontally, and a plurality of vacuum suction cups 17 for grabbing the pole piece 18 are installed at their lower ends, and the vacuum suction cups 17 are connected to the vacuum generator through the gas distribution block 12 and the vacuum pressure regulating valve 11. The width adjustment plate 21 and the pole ear adjustment plate 22 are fixedly connected to the fixed bracket respectively.

[0035] The inner end of the length adjustment plate 19 is rotatably connected to the fixed bracket, and the outer end of the length adjustment plate 19 is hinged to the bending cylinder 13, and the upper end of the inclined bending cylinder 13 is connected to the fixed bracket. The bending cylinder 13 performs telescopic movement to switch the length adjustment plate 19 back and forth between the horizontal position and the upward tilted position, further bending the long sides of the pole piece 18 adsorbed by the length adjustment plate 19 and the bottom of the pole lug adjustment plate 22 to a large extent, separating the pole pieces bonded together. When bending, it is along the direction of the roller forming, which will not damage the pole piece body, and basically prevents the phenomenon of slag and powder falling during the shaking of the pole piece.

[0036] A double sheet sensor 14 is provided at the bottom center of the electrode bending assembly 5. The double sheet sensor 14 can detect whether the electrode 18 grasped under the vacuum suction cup 17 is double or multiple sheets, thereby improving accuracy. A speed regulating valve 15 is provided on the bending cylinder 13. The cylinder speed regulating valve 15 is used to adjust the frequency of the cylinder bending the electrode. When the bending frequency of the electrode bending mechanism is too slow during transportation, and double or multiple electrode sheets cannot be separated, the speed regulating valve 15 is adjusted to increase the bending frequency.

[0037] like Figure 2 As shown, an adjusting bolt 16 is provided above the length adjustment plate 19, and the adjusting bolt 16 is connected to the fixed bracket through an L-shaped connecting block, and the adjusting bolt 16 can move up and down. When the bending cylinder 13 of the bending mechanism is not large enough, and multiple or double pole pieces cannot be separated, the adjusting bolt 16 can be increased to increase the cylinder stroke, thereby increasing the shaking amplitude of the bending mechanism; when the bending amplitude angle of the bending mechanism is too large, the vacuum suction cup 17 at the bottom that absorbs the pole piece cannot firmly absorb the pole piece, it is necessary to reduce the adjusting bolt 16, reduce the cylinder stroke, and reduce the shaking amplitude of the bending mechanism. The first layer of pole pieces on the lower side of the suction plate also fall off during transportation or shaking, and the vacuum pressure in the suction cup can also be increased by adjusting the vacuum pressure relief valve 11.

[0038] In addition, during normal lamination production, a lamination machine often needs to be compatible with pole pieces of different lengths and widths. In the present invention, a pair of vacuum suction cups 17 are installed on the length adjustment plate 19 through a suction cup fixing bracket 20; and a waist-shaped groove extending along the length direction is provided inside the length adjustment plate 19, and the suction cup fixing bracket 20 is slidably installed in the waist-shaped groove through a fastener and can move along the length direction; the position of the vacuum suction cup 17 in the length direction can be adjusted.

[0039] Similarly, a waist-shaped groove 2 extending in the length direction is provided inside the pole ear adjustment plate 22 disposed at the other end of the fixed bracket in the length direction, and the position of the vacuum suction cup 17 in the length direction of the pole piece bending assembly 5 can be adjusted. A waist-shaped groove 3 is provided on the width adjustment plate 21 disposed on one side of the fixed bracket in the width direction, and the waist-shaped groove 3 on the width adjustment plate 21 extends in the width direction, and the position of the vacuum suction cup 17 in the width direction can be adjusted.

[0040] By designing the length adjustment plate 19 and the width adjustment plate 21 with adjustable width and length, different types of pole pieces can be compatible. By adjusting the different positions of the vacuum suction cup 17 on the suction cup fixing bracket 20, the suction cup can be adjusted to absorb the pole piece position according to the actual on-site debugging situation, so as to achieve the best pole piece grabbing effect. This simple mechanical structure can adapt to the production of different types of battery cells, with fast changeover speed and low changeover cost. It fundamentally solves the cost of changing the type of the film-taking robot when producing different types of batteries. At the same time, during the changeover process, it only needs to adjust the width and length of the suction cup fixing bracket, or move the suction cup on the fixing bracket, which greatly improves the changeover time of the film-taking robot.

[0041] It should be noted that the servo ball screw mechanism used in the manipulator lifting assembly 2 and the manipulator lifting assembly 1 4 in the device can be replaced with a servo synchronous belt or a linear motor module, which still falls within the protection scope of the present invention.

[0042] The working principle and working process of the high-speed and high-efficiency PNP mechanism for preventing multiple sheet taking of the present invention are briefly described below.

[0043] The pole piece is loaded through the material bin, the pole piece bending assembly 5 sucks up the pole piece, and then the pole piece is moved to the secondary positioning platform for secondary photo determination. When the accuracy and product quality of the battery cell are met, the pole piece suction plate assembly 3 moves the pole piece from the secondary positioning to the stacking plate for Z stacking;

[0044] When the second photo is judged as unqualified, the electrode suction plate assembly 3 will suck up the electrode again, and the waste discharge box will place the unqualified electrode into the waste discharge assembly, and a new electrode will be added from the material bin to the second position, and re-judged until it meets the requirements, and then the electrode suction plate assembly 3 will move it to the stacking table for stacking. It can be seen that a qualified electrode is very important for the smoothness of the entire production operation, avoiding double sheets can effectively improve the efficiency of producing battery cells.

[0045] The electrode bending assembly 5 sucks the electrode from the silo, and then the manipulator lifting assembly 4 lifts the electrode from the silo to a certain height. At this moment, the sucked electrode is still in the silo. During the lifting process, the brush and ion wind on the side of the silo peel the electrode once. Most of the double or multiple electrode sheets will separate in this process and fall into the silo. If the first layer of electrode sheets on the lower side of the suction plate also fall during the transportation or shaking process during the brush and ion wind peeling process, the vacuum pressure in the suction cup can be increased by adjusting the vacuum pressure relief valve 11.

[0046] In addition to the above-mentioned beneficial effects, the high-speed and high-efficiency PNP mechanism for preventing multiple sheet taking of the present invention has the following features:

[0047] 1. The long side of the pole piece is bent over a large area. Bending along the long side can increase the bending range. At the same time, the long side is also the winding direction of the pole piece produced by the roller. Bending along the long side will not damage the pole piece, causing powder and slag problems, and will not damage the pole piece.

[0048] 2. Use cylinder bending, brushes, and plasma wind to prevent double sheets. When the lifting arm sucks up the pole piece, the brush and plasma wind will try to peel off the bonded pole piece for the first time, so that the pole pieces are not so tightly bonded. When sucking, the cylinder will bend the long side of the pole piece significantly, and shake the bonded pole pieces apart again. After repeated several times, the occurrence of double sheets can be basically eliminated. A series of measures to prevent double sheets from occurring outside the machine are combined with double sheet detection sensors to determine the pole piece finally grabbed on the secondary positioning platform, so that the occurrence of double sheets can be completely eliminated during the stacking process.

[0049] 3. Separate the bending and lifting. When the electrode is lifted by the electrode picking robot, the bending cylinder works at the same time to repeatedly bend the electrode along the long side, which will not occupy the production cycle and improve the stacking production efficiency.

[0050] The patent of the present invention focuses on the process from silo suction to transportation, in which the bending mechanism greatly bends the pole piece along the long side of the pole piece 18 to separate the pole pieces bonded together. The larger the bending amplitude, the better the effect of reducing double bending.

[0051] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-speed and efficient PNP mechanism for preventing multiple sheet taking, characterized in that: It comprises a horizontal servo slide (1) and a manipulator lifting assembly (4) slidably connected thereto, wherein a pole piece bending assembly (5) is provided on the manipulator lifting assembly (4); a pole piece (18) in a silo is moved to a secondary positioning platform; The pole piece bending assembly (5) comprises a fixing bracket, a length adjustment plate (19) and a pole lug adjustment plate (22); the length adjustment plate (19) and the pole lug adjustment plate (22) are both arranged horizontally, and a plurality of vacuum suction cups (17) for grasping the pole piece (18) are installed at their lower ends; One end of the length adjustment plate (19) is directly rotatably connected to the fixed bracket, and the other end is indirectly connected to the fixed bracket via a bending cylinder (13); the bending cylinder (13) performs telescopic movement to switch the length adjustment plate (19) back and forth between a horizontal position and an upwardly inclined position, so that the captured pole piece (18) is greatly bent and separated from the lower pole piece (18).

2. The high-speed and high-efficiency PNP mechanism for preventing multiple sheet taking according to claim 1 is characterized in that: A double sheet sensor (14) is provided at the bottom of the pole sheet bending assembly (5) to detect whether the pole sheet (18) is double or multiple.

3. The high-speed and high-efficiency PNP mechanism for preventing multiple sheet taking according to claim 1 is characterized in that: The bending cylinder (13) is provided with a speed regulating valve (15).

4. The high-speed and high-efficiency PNP mechanism for preventing multiple sheet taking according to claim 1 is characterized in that: An adjusting bolt (16) is arranged above the length adjusting plate (19), and the adjusting bolt (16) is connected to the fixing bracket and can move up and down.

5. The high-speed and high-efficiency PNP mechanism for preventing multiple sheet taking according to claim 1 is characterized in that: The vacuum suction cup (17) is connected to the vacuum generator via a gas distribution block (12) and a vacuum pressure regulating valve (11).

6. The high-speed and high-efficiency PNP mechanism for preventing multiple sheet taking according to claim 1 is characterized in that: The length adjustment plate (19) is provided with a pair of vacuum suction cups (17) via a suction cup fixing bracket (20); and the length adjustment plate (19) is provided with a waist-shaped groove extending along the length direction, and the suction cup fixing bracket (20) is slidably installed in the waist-shaped groove via a fastener.

7. The high-speed and high-efficiency PNP mechanism for preventing multiple sheet taking according to claim 1, characterized in that: The tab adjustment plate (22) at the other end of the fixed bracket in the length direction is provided with a waist-shaped groove 2 extending in the length direction.

8. The high-speed and high-efficiency PNP mechanism for preventing multiple sheet taking according to claim 1 is characterized in that: The pole piece bending assembly (5) is also provided with a width adjustment plate (21) for mounting the vacuum suction cup (17), and the width adjustment plate (21) is provided with a waist-shaped groove three extending in the width direction.

9. The high-speed and high-efficiency PNP mechanism for preventing multiple sheet taking according to claim 1, characterized in that: The horizontal servo slide (1) is also equipped with a manipulator lifting assembly (2) and a pole piece suction plate assembly (3), and the pole piece suction plate assembly (3) moves the pole piece (18) on the secondary positioning platform to the stacking platform.

10. The high-speed and high-efficiency PNP mechanism for preventing multiple sheet taking according to claim 9, characterized in that: The horizontal servo slide (1), the second manipulator lifting assembly (2), the pole piece suction plate assembly (3), the first manipulator lifting assembly (4) and the pole piece bending assembly (5) are each provided with two groups and are symmetrically distributed; one group is responsible for grasping the positive pole piece and Z-shaped lamination; the other group is responsible for grasping the negative pole piece and Z-shaped lamination.

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