Lithium battery rolling pole piece slitting equipment

Abstract

The invention relates to lithium battery rolling pole piece slitting equipment, and relates to the technical field of lithium battery assembly.The lithium battery rolling pole piece slitting equipment comprises a feeding conveyor belt and a discharging conveyor belt, a transferring mechanism used for moving pole pieces is arranged between the feeding conveyor belt and the discharging conveyor belt, and the height and the transverse position of the transferring mechanism are adjustable; the transfer mechanism is matched with the pretreatment mechanism at the highest end, and the pretreatment mechanism comprises a primary hot pressing roller for rolling and heating the pole piece and a heavy pressing plate for flatly pressing and heating the pole piece. Slitted pole pieces are fed to the transferring mechanism through the feeding conveying belt, the position and height of the pole pieces are adjusted through the transferring mechanism, the pole pieces are directly separated from other pole pieces, and then the pole pieces are heated and rolled through rotation of the preliminary hot pressing roller on the pole pieces; and then the pole piece is subjected to flat pressing and hot pressing by utilizing a heavy pressing plate, so that the problem of edge curling caused after the pole piece is slit is solved.

Description

Technical Field

[0001] The invention relates to the technical field of lithium battery assembly, in particular to lithium battery roller-pressed pole piece slitting equipment. Background Art

[0002] Rolling is one of the most critical processes in the manufacturing process of lithium battery pole pieces. The accuracy of rolling greatly affects the performance of lithium batteries. The rolling process can keep the surface of the pole piece smooth and flat, improve the energy density of the battery, reduce the volume of the pole piece, and improve the cycle life and safety performance of the lithium battery.

[0003] During the process of cutting the pole piece after rolling, the rebound rate of the pole piece is large, which causes curling at the edge of the pole piece, affecting the production quality of the pole piece, resulting in the production of some defective products, and making the production cost of the product higher. Summary of the invention

[0004] The purpose of the present invention is to provide a lithium battery roller-pressed electrode sheet slitting device.

[0005] The technical problem solved by the present invention is to solve the problem in the prior art that after the pole piece is cut, the edge position of the pole piece is prone to curling.

[0006] The present invention can be implemented through the following technical scheme: lithium battery roller-pressed electrode sheet slitting equipment, including a loading conveyor belt and a unloading conveyor belt, a transfer mechanism for moving the electrode sheet is arranged between the loading conveyor belt and the unloading conveyor belt, the height and lateral position of the transfer mechanism are adjustable, and the transfer mechanism cooperates with a pretreatment mechanism when it is at the highest end, and the pretreatment mechanism includes a preliminary hot pressing roller for roller-pressing and heating the electrode sheet and a heavy pressing plate for flat-pressing and heating the electrode sheet.

[0007] A further technical improvement of the present invention is that the preliminary hot pressing roller is mounted on a mobile power assembly, the fixed end of the mobile power assembly is mounted on a top shell, and the height of the top shell is adjustable.

[0008] A further technical improvement of the present invention is that the heavy pressure plate is fixedly mounted on the heavy pressure connecting plate, the heavy pressure connecting plate is T-shaped, and the heavy pressure connecting plate is fixedly mounted on the heavy pressure oil cylinder, and the heavy pressure oil cylinder is fixedly mounted on the top shell.

[0009] A further technical improvement of the present invention is that a limiting column is fixed on the top shell, a moving power assembly is installed on the limiting column, and a middle pressure hole for realizing longitudinal movement of the pressure plate is opened on the top of the top shell.

[0010] A further technical improvement of the present invention is that the transfer mechanism includes a mobile base, on which an internal conveyor belt for conveying the pole piece is installed, and the internal conveyor belt is a vacuum adsorption belt.

[0011] A further technical improvement of the present invention is that the mobile base is rotatably mounted on the adjustment rotating rod, the adjustment rotating rod is mounted on the output end of the power chassis, and the power chassis is fixedly mounted on the transfer base.

[0012] A further technical improvement of the present invention is that the transfer base is installed at the output end of the moving screw rod, and the transfer base is rotatably connected to the frame.

[0013] A further technical improvement of the present invention is that a matching limit plate is fixed on the side of the movable base, a matching limit hole is provided on the matching limit plate, and a limiting column is fixed on the bottom of the top shell, and the limiting column and the limiting matching hole cooperate.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present application loads the slit electrode piece onto a transfer mechanism via a loading conveyor belt, uses the transfer mechanism to drive the electrode piece to adjust its position and height, separates the electrode piece directly from the other electrode pieces, then uses a preliminary hot pressing roller to rotate on the electrode piece to heat and roll the electrode piece, then uses a heavy pressing plate to perform flat pressing and hot pressing on the electrode piece, so as to reduce the problem of curling of the electrode piece after slitting. At the same time, the present application adjusts the position of the electrode piece by using a transfer mechanism, so that the electrode piece can move stably during rolling, reducing the possibility of curling on the electrode piece, and controls the height of the electrode piece by using a transfer mechanism, so as to separate the electrode piece from the other electrode pieces in height, thereby avoiding uneven heating of the electrode pieces arranged on the loading conveyor belt.

[0016] 2. The present application utilizes the rotation of the rotating rod to realize the control of the process of automatic loading and unloading and pre-processing of the electrode. When the rotating rod is rotated to the two lowest ends, the automatic loading and unloading of the electrode can be controlled. When the rotating rod is rotated to the highest end, the electrode can automatically cooperate with the pre-processing mechanism. Since the rotation path of the rotating rod is arc-shaped, it can ensure that the electrode can be close to the rotating rod while moving laterally away from the loading conveyor belt, thereby ensuring the stability and efficiency of the electrode transfer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the relative position of the transfer mechanism of the present invention;

[0019] Figure 2 It is a schematic diagram of the transfer mechanism structure of the present invention;

[0020] Figure 3 It is a schematic diagram of the position of the negative pressure adsorption plate of the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of the pretreatment mechanism of the present invention;

[0022] Figure 5 It is a schematic diagram of the position of the heavy pressure plate of the present invention;

[0023] Figure 6 It is a schematic diagram of the relative positions of the loading conveyor belt and the unloading conveyor belt of the present invention.

[0024] In the figure: 1. Transfer mechanism; 11. Transfer base; 12. Adjustment of rotating rod; 13. Connection shaft; 14. Internal conveyor belt; 15. Matching limit plate; 16. Limit matching hole; 17. Moving base; 18. Connecting base; 19. Moving screw; 110. Conveyor roller; 111. Negative pressure adsorption plate; 2. Pretreatment mechanism; 21. Heavy pressure shell; 22. Top shell; 23. Limit column; 24. Moving power assembly; 25. Preliminary hot pressing roller; 26. Heavy pressure cylinder; 27. Middle heavy pressure hole; 28. Heavy pressure plate; 29. ​​Heavy pressure connecting plate; 3. Loading conveyor belt; 4. Unloading conveyor belt. DETAILED DESCRIPTION

[0025] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0026] See also Figure 1-6 As shown, the lithium battery rolled electrode sheet slitting equipment includes a loading conveyor belt 3 for loading the slit electrode sheets and a unloading conveyor belt 4 for unloading the pre-treated electrode sheets. A transfer mechanism 1 for the slit electrode sheets is arranged between the loading conveyor belt 3 and the unloading conveyor belt 4, and the transfer mechanism 1 has three stations. The first station is a position that cooperates with the loading conveyor belt 3 and is used to realize the loading of the slit electrode sheets. The second station is cooperated with the pretreatment mechanism 2, which is used to pre-treat the slit electrode sheets to reduce the curling phenomenon of the slit electrode sheets. Then the third station cooperates with the unloading conveyor belt 4 to stably unload the pre-treated electrode sheets. Therefore, in the present application, the transfer mechanism 1 is used to realize the transfer function of the slit electrode sheets to reduce the impact on the remaining adjacent electrode sheets.

[0027] Specifically, the pretreatment mechanism 2 in the present application uses a heating method to heat the cut pole piece separately, that is, when the pole piece is heated to a certain temperature, it is rolled again, which can dry the pole piece, reduce the water content of the pole piece, and reduce the rebound rate of the pole piece after rolling. After heating, the adhesive on the pole piece is softened or molten by heat. After rolling, the activity can be enhanced. The adhesion between the material and the current collector is beneficial to increasing the liquid absorption of the active material. In the present application, the pole piece after cutting is rolled and heated again, which can effectively prevent the pole piece from curling and ensure the flatness of the pole piece. When the pole piece after cutting is rolled again, the possibility of the edge being pulled up due to adsorption generated during cutting is reduced. When the pole piece after cutting is heated separately, each pole piece can be heated, which reduces the uneven heating caused by the different distances between the remaining pole pieces and the heat source when the pole piece contacts the heat.

[0028] The pretreatment mechanism 2 includes a preliminary hot pressing roller 25 and a heavy pressing plate 28, wherein the preliminary hot pressing roller 25 moves laterally on the slit electrode piece so that the slit electrode piece can be sufficiently heated to reduce the possible curling problem of the electrode piece. After the preliminary residual heat is finished, the heavy pressing plate 28 is moved longitudinally to act on the electrode piece, and the heating function of the heavy pressing plate 28 is used to further heat the electrode piece to ensure that the electrode piece is heated evenly when it is subjected to pressure in the longitudinal plane, so that the electrode piece will not have curling problems during the hot pressing process.

[0029] Therefore, in the present application, the preliminary hot pressing roller 25 is installed on the mobile power assembly 24, and the mobile power assembly 24 is used to drive the preliminary hot pressing roller 25 to move laterally, so that the preliminary hot pressing roller 25 acts on the pole piece to perform preliminary processing on the pole piece.

[0030] The mobile power assembly 24 is fixedly mounted on the limit column 23, and the limit column 23 is fixedly mounted on the top shell 22. The relative limiting function of the limit column 23 and the transfer mechanism 1 is utilized to realize the position limitation of the pretreatment mechanism 2 and the transfer mechanism 1, so as to facilitate the use of the pretreatment mechanism 2 to act on the pole piece on the transfer mechanism 1.

[0031] The mobile power component 24 in the present application adopts the mobile module in the prior art, which is used to drive the preliminary hot pressing roller 25 to move laterally, and the fixed end of the mobile power component 24 is fixedly installed on the adjacent limiting column 23, so as to control the preliminary hot pressing roller 25 to move in the horizontal direction parallel to the limiting column 23, so as to facilitate the use of the preliminary hot pressing roller 25 to heat and roll the electrode.

[0032] The weight plate 28 is installed at the output end of the longitudinal moving component, and the longitudinal moving component is used to control the weight plate 28 to move longitudinally, so that the weight plate 28 can act on the pole piece and reprocess the pole piece. A weight shell 21 is fixed above the top shell 22, and an intermediate weight hole 27 for the weight plate 28 to pass through is opened on the top shell 22. A weight cylinder 26 is fixedly installed inside the weight shell 21, and a weight connecting plate 29 is fixed at the output end of the weight cylinder 26. The weight connecting plate 29 is T-shaped, and the weight plate 28 is installed at the end of the weight connecting plate 29. When in use, the weight cylinder 26 is started to control the height of the weight connecting plate 29, so that the weight connecting plate 29 is controlled to move longitudinally, and the weight plate 28 passes through the intermediate weight hole 27, so that the weight plate 28 acts on the pole piece.

[0033] A heating wire with a heating function is arranged inside the heavy pressure plate 28. The heating wire is coiled in the cavity of the heavy pressure plate 28 to heat the heavy pressure plate 28, thereby realizing the heavy pressure function of the heavy pressure plate 28 to ensure that the heavy pressure plate 28 can pressurize and heat the electrode piece, thereby ensuring that the electrode piece after cutting is relatively stably located on the transfer mechanism 1, and the electrode piece can avoid curling after the above treatment, and prevent the electrode piece from rebounding after rolling.

[0034] In order to adapt to the cut pole pieces, the transfer mechanism 1 in the present application includes a mobile base 17, wherein a plurality of connecting bases 18 are fixed on the mobile base 17, and an adjusting rotating rod 12 is rotatably arranged on the connecting base 18. The adjusting rotating rod 12 is installed at the output end of the bottom motor, that is, the bottom motor is used to drive the adjusting rotating rod 12 so that the adjusting rotating rod 12 cooperates to rotate to control the movement of the mobile base 17. When the mobile base 17 moves to one of the lowest ends, it cooperates with the loading conveyor belt 3, and when the mobile base 17 moves to the other lowest end, it cooperates with the unloading conveyor belt 4. Thereby, automatic loading and unloading of the electrode sheets can be realized, and the transfer path of the movable base 17 is an arc, so when the movable base 17 is transferred to the highest end, it cooperates with the pretreatment mechanism 2 at this time, and in order to further control the lateral position of the movable base 17, the bottom motor is fixedly installed on the transfer base 11 in the present application, and the transfer base 11 is installed on the output end of the movable screw 19, and the transfer base 11 and the bracket are slidably connected, and the movable screw 19 drives the transfer base 11 to move under the driving action of the external power, so that the lateral position accuracy of the movable base 17 can be accurately controlled.

[0035] A matching limit plate 15 is fixedly mounted on the movable base 17, and a corresponding limit matching hole 16 is provided on the matching limit plate 15. The limit matching hole 16 is used to cooperate with the limit column 23, so that when the limit column 23 moves longitudinally, it enters the inside of the limit matching hole 16 to limit the relative position of the top shell 22 and the movable base 17, so as to ensure the working position accuracy of the preliminary hot pressing roller 25 and the heavy pressure plate 28 inside the top shell 22, so that the pole piece can be accurately pre-processed.

[0036] A power chassis is fixed on the mobile base 17, and the rotation of the conveying roller 110 is controlled by the power motor and the corresponding transmission assembly, so as to drive the movement of the internal conveyor belt 14 arranged on the adjacent conveying roller 110. When the electrode is placed on the internal conveyor belt 14, the power chassis is used to drive the rotation of the conveying roller 110, so that the electrode is driven to move laterally. At this time, the electrode can be moved to the middle position of the mobile base 17, so that it is convenient to use the pretreatment mechanism 2 to process it. At the same time, since a horizontal plate is provided on the frame structure of the mobile base 17, the horizontal plate is located above the internal conveyor belt 14, so that the flush electrode can pass through the bottom of the horizontal plate, so as to realize the smooth unloading of the electrode.

[0037] The internal conveyor belt 14 is provided with adsorption holes, that is, a negative pressure adsorption plate 111 is fixed on the mobile base 17, and the negative pressure adsorption plate 111 is located below the internal conveyor belt 14. The negative pressure adsorption plate 111 is used to make the internal conveyor belt 14 have a certain adsorption property, so that the electrode placed on the internal conveyor belt 14 has a certain adsorption function, thereby ensuring the stable placement of the electrode.

[0038] When the present invention is in use, the lateral position of the transfer base 11 is first controlled, and the rotation angle of the rotation rod 12 is controlled and adjusted, so that the mobile base 17 is lowered to the lowest end, until the height of the internal conveyor belt 14 on the mobile base 17 is slightly lower than the height of the feeding conveyor belt 3. At this time, under the starting action of the feeding conveyor belt 3 and the internal conveyor belt 14, a single pole piece is stably transferred to the internal conveyor belt 14 until the pole piece is moved to the middle position of the mobile base 17, at which time the pole piece can be loaded. Then, the lateral position of the mobile base 17 is used to be away from the feeding conveyor belt 3, so that the pole piece and the pole piece on the feeding conveyor belt 3 are separated. Then, the rotation angle of the rotation rod 12 is controlled and adjusted, so that the adjustment rotation rod 12 drives the internal conveyor belt 14 to be at the highest end, and the mobile base 17 is moved To the position of the pretreatment mechanism 2, start the pretreatment mechanism 2. During this process, the height of the internal conveyor belt 14 is higher than the height of the loading conveyor belt 3, which can reduce the heat interference caused by the heat in the pretreatment mechanism 2 to the pole piece on the loading conveyor belt 3, resulting in the problem of uneven heating of the pole piece. In this application, by processing a single pole piece separately, the problem of uneven contact heat on the pole piece can be reduced. At the same time, this application further avoids the problem of uneven heat between the pole pieces by adjusting the rotation of the rotating rod 12 and adjusting the pretreatment height of the pole piece and the pretreatment mechanism 2. Subsequently, this application controls the lateral position of the transfer base 11 and adjusts the angle of the rotating rod 12 so that the height of the internal conveyor belt 14 is slightly higher than the height of the unloading conveyor belt 4, so as to realize the automatic unloading function of the pole piece.

[0039] When the pretreatment mechanism 2 is in use, the longitudinal height of the top shell 22 is controlled by an external push rod, that is, the external push rod adopts an external telescopic rod, etc., and its output end is fixedly installed on the top shell 22, thereby controlling the longitudinal movement of the limit column 23 fixedly installed on the top shell 22, until the limit column 23 moves to the lowest end, the limit column 23 passes through the limit matching hole 16, to limit the position of the top shell 22, thereby being able to limit the position of the pretreatment mechanism 2. When in use, firstly, the mobile power component 24 is started to drive the preliminary hot pressing roller 25 to act on the pole piece, and the pole piece is preliminarily pretreated to reduce the possibility of rebound of the pole piece. At this time, the bottom of the pole piece is under the action of the negative pressure adsorption plate 111, so that the pole piece is tightly attached to the internal conveyor belt 14, and then the heavy pressure cylinder 26 is started to control the heavy pressure plate 28 to pass through the middle heavy pressure hole 27, and the heavy pressure plate 28 is pressed on the pole piece to further ensure that the pole piece will not rebound and avoid the occurrence of curling.

[0040] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A lithium battery roller-pressed electrode sheet slitting device, comprising a loading conveyor belt (3) and a unloading conveyor belt (4), characterized in that: A transfer mechanism (1) for moving the electrode piece is arranged between the loading conveyor belt (3) and the unloading conveyor belt (4); the height and lateral position of the transfer mechanism (1) are adjustable, and the transfer mechanism (1) cooperates with a pretreatment mechanism (2) when at the highest end; the pretreatment mechanism (2) comprises a preliminary hot pressing roller (25) for rolling and heating the electrode piece and a heavy pressing plate (28) for flat pressing and heating the electrode piece.

2. The lithium battery roll-pressed electrode sheet slitting equipment according to claim 1, characterized in that: The preliminary hot pressing roller (25) is mounted on a mobile power assembly (24), the fixed end of the mobile power assembly (24) is mounted on a top shell (22), and the height of the top shell (22) is adjustable.

3. The lithium battery roll-pressed electrode sheet slitting equipment according to claim 2, characterized in that: The heavy pressure plate (28) is fixedly mounted on a heavy pressure connecting plate (29), the heavy pressure connecting plate (29) is T-shaped, and the heavy pressure connecting plate (29) is fixedly mounted on a heavy pressure oil cylinder (26), and the heavy pressure oil cylinder (26) is fixedly mounted on a top shell (22).

4. The lithium battery roll-pressed electrode sheet slitting equipment according to claim 3, characterized in that: A limiting column (23) is fixed on the top shell (22), the moving power assembly (24) is installed on the limiting column (23), and a middle pressure hole (27) for realizing longitudinal movement of the pressure plate (28) is opened on the top of the top shell (22).

5. The lithium battery roll-pressed electrode sheet slitting equipment according to claim 2, characterized in that: The transfer mechanism (1) comprises a movable base (17), on which an internal conveyor belt (14) for conveying the pole piece is installed, and the internal conveyor belt (14) is a vacuum adsorption belt.

6. The lithium battery roll-pressed electrode sheet slitting equipment according to claim 5, characterized in that: The movable base (17) is rotatably mounted on the adjusting rotating rod (12), the adjusting rotating rod (12) is mounted on the output end of the power box, and the power box is fixedly mounted on the transfer base (11).

7. The lithium battery roll-pressed electrode sheet slitting equipment according to claim 6, characterized in that: The transfer base (11) is installed at the output end of the moving screw (19), and the transfer base (11) is rotatably connected to the frame.

8. The lithium battery roll-pressed electrode sheet slitting equipment according to claim 5, characterized in that: A matching limit plate (15) is fixed on the side of the movable base (17), a matching limit hole (16) is provided on the matching limit plate (15), and a limiting column (23) is fixed on the bottom of the top shell (22), and the limiting column (23) and the limiting hole (16) are matched.

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