CN219985234U - Closed loop coating die and coating apparatus - Google Patents

Abstract

The utility model provides a closed loop coating die and coating equipment. The closed-loop coating die head comprises an upper die head (1) and a lower die head (2) which are overlapped up and down, the upper die head (1) and the lower die head (2) are matched to form a liquid outlet gap (5) and a feeding channel (11) communicated with the liquid outlet gap (5), the feeding channel (11) is provided with an adjusting device for adjusting slurry flow near the liquid outlet gap (5), the adjusting device comprises a plurality of lifting mechanisms (6) which are sequentially arranged, the width between every two adjacent lifting mechanisms (6) is L1, the width of each lifting mechanism (6) along the arrangement direction is L2, and the L1 is more than or equal to 0.8 x L2. The closed-loop coating die head can reduce the number of lifting mechanisms and the equipment cost.

Description

Closed loop coating die and coating apparatus

Technical Field

The utility model relates to the technical field of lithium ion battery pole piece coating equipment, in particular to a closed-loop coating die head and coating equipment.

Background

The lithium ion battery has high energy density and wide working temperature range, and is about-20 ℃ to 60 ℃. The battery cell material has the advantages of excellent cycle performance, high charge and discharge speed, high charge efficiency, high output power, long service life and no toxic or harmful substances, and can realize secondary recycling, so the battery cell material is called a green battery.

Currently, the lithium battery industry has been widely used in various new energy power automobiles and energy storage fields. In the energy storage field, the lithium battery mainly comprising lithium iron phosphate plays a great role in expanding capacitance, peak clipping, valley filling and the like. With the vigorous development of the battery industry, the application of the lithium battery to the portable and standby batteries and the like can expand the service range of the lithium battery, exert the advantages of the lithium battery, and have potential popularization value and commercial application.

In the battery manufacturing industry, especially in the field of new energy automobiles and lithium ion power batteries for energy storage, the requirement on the consistency of the batteries is higher and higher. And the uniformity of the pole piece coating is critical. In order to ensure the consistency of the battery pole pieces, a plurality of choked flow blocks driven by lifting mechanisms such as a servo motor and the like are adopted to adjust gaps of a slurry liquid outlet during coating, and the size of the liquid outlet is adjusted in a real-time closed loop mode according to the measured value of the coating surface density so as to meet the requirement of uniform and consistent coating surface density.

In order to meet the coating tolerance requirements of the pole pieces, the lifting mechanism needs to be used densely, and the overall cost of the equipment is increased.

Disclosure of Invention

The utility model mainly aims to provide a closed-loop coating die head and coating equipment, which can reduce the number of lifting mechanisms and reduce equipment cost.

In order to achieve the above object, according to an aspect of the present utility model, there is provided a closed-loop coating die, including an upper die and a lower die stacked up and down, the upper die and the lower die cooperate to form a liquid outlet gap and a feeding channel communicating with the liquid outlet gap, the feeding channel is provided with an adjusting device for adjusting slurry flow near the liquid outlet gap, the adjusting device includes a plurality of lifting mechanisms arranged in sequence, a width between two adjacent lifting mechanisms is L1, a width of the lifting mechanisms in an arrangement direction is L2, and L1 is greater than or equal to 0.8×l2.

Further, the adjusting device further comprises a flow blocking block, the flow blocking block is located at the position, close to the liquid outlet gap, of the feeding channel, the lifting mechanism is arranged on the upper die, the flow blocking block is arranged at the telescopic end of the lifting mechanism, the width of the liquid outlet gap is adjusted under the driving action of the lifting mechanism, and two adjacent flow blocking blocks are connected through a flexible adjusting piece which is arranged in a hanging mode.

Further, 1.5×L2 is greater than or equal to L1 and greater than or equal to L2; and/or L2 is less than or equal to 20mm.

Further, the flexible adjusting piece is a corrugated pipe, a polygonal column, a cylinder or an elliptic cylinder.

Further, the cross-sectional shape and size of the flexible regulating member are the same as the shape and size of the connecting end face of the choke block.

Further, the pitch of the corrugated pipe is 1 mm-5 mm, and the wall thickness of the corrugated pipe is 0.8-1.2 mm.

Further, the lifting mechanism comprises a driving rod, the upper die head comprises a sliding groove which is arranged at the bottom and communicated with the liquid outlet gap feeding channel, and a sealing piece which is in sliding sealing fit with the driving rod is arranged above the sliding groove.

Further, at least two liquid storage tanks are arranged on the casting surface of the lower die head, are positioned on the feeding path of the feeding channel, and gradually reduce in volume along the feeding direction.

Further, a feed channel is arranged on the upper die head and/or the lower die head, and the feed channel is communicated with the liquid storage tank.

According to another aspect of the present utility model, there is provided a coating apparatus comprising a closed loop coating die, which is the closed loop coating die described above.

Further, the coating apparatus includes a coating head and a coating tail, each of which is provided with a closed-loop coating die.

By applying the technical scheme of the utility model, the closed-loop coating die head comprises an upper die head and a lower die head which are overlapped up and down, the upper die head and the lower die head are matched to form a liquid outlet gap and a feeding channel communicated with the liquid outlet gap, the feeding channel is provided with an adjusting device for adjusting slurry flow near the liquid outlet gap, the adjusting device comprises a plurality of lifting mechanisms which are sequentially arranged, the width between two adjacent lifting mechanisms is L1, the width of the lifting mechanisms along the arrangement direction is L2, and L1 is more than or equal to 0.8L2. This closed loop coating die head has optimized elevating system's interval and the quantity of arranging, has increased the interval between the adjacent elevating system for same closed loop coating die head is carrying out thick liquids flow control in-process, and required elevating system's quantity can reduce by a wide margin, thereby effectively reduces elevating system's cost, reduces the cost of closed loop coating die head.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.

Fig. 1 shows a perspective view of a closed loop coating die according to an embodiment of the present utility model.

FIG. 2 shows a cross-sectional block diagram of a closed loop coating die of an embodiment of the utility model.

Fig. 3 shows a schematic structural view of an adjusting device of a closed-loop coating die according to an embodiment of the present utility model.

Wherein the above figures include the following reference numerals.

1. An upper die head; 2. a lower die head; 3. a feed channel; 4. a liquid storage tank; 5. a liquid outlet gap; 6. a lifting mechanism; 7. a driving rod; 8. a seal; 9. a choke block; 10. a flexible adjustment member; 11. and a feeding channel.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Referring to fig. 1 to 3, the utility model provides a closed-loop coating die head, which comprises an upper die head 1 and a lower die head 2 which are overlapped up and down, wherein the upper die head 1 and the lower die head 2 are matched to form a liquid outlet gap 5 and a feeding channel 11 communicated with the liquid outlet gap 5, the feeding channel 11 is provided with an adjusting device for adjusting slurry flow near the liquid outlet gap 5, the adjusting device comprises a plurality of lifting mechanisms 6 which are sequentially arranged, the width between two adjacent lifting mechanisms 6 is L1, the width of the lifting mechanisms 6 along the arrangement direction is L2, and L1 is more than or equal to 0.8 x L2.

The spacing and the arrangement quantity of the lifting mechanisms 6 are optimized, the spacing between adjacent lifting mechanisms 6 is increased, the quantity of the lifting mechanisms 6 required in the slurry flow adjustment process of the same closed-loop coating die head can be greatly reduced, the cost of the lifting mechanisms 6 is effectively reduced, and the cost of the closed-loop coating die head is reduced.

In one embodiment, the adjusting device further comprises a flow blocking block 9, the flow blocking block 9 is located at a position, close to the liquid outlet gap 5, of the feeding channel 11, the lifting mechanism 6 is arranged on the upper die head 1, the flow blocking block 9 is arranged at the telescopic end of the lifting mechanism 6, the width of the liquid outlet gap 5 is adjusted under the driving action of the lifting mechanism 6, and two adjacent flow blocking blocks 9 are connected through a flexible adjusting piece 10 which is arranged in a suspended mode.

After the interval between adjacent lifting mechanisms 6 is increased and the use quantity of the lifting mechanisms 6 is reduced, the interval between the adjacent lifting mechanisms 6 is increased, the adjustment of slurry flow is influenced, in the embodiment, two adjacent choked blocks 9 are connected through a flexible adjusting piece 10, the choked blocks 9 at two ends of the flexible adjusting piece 10 are utilized to realize linkage adjustment of the flexible adjusting piece 10, so that the liquid outlet quantity of the gap caused by reduction of the quantity of the lifting mechanisms 6 can be adjusted through the flexible adjusting piece 10, meanwhile, the continuous deformation of the flexible adjusting piece is utilized to replace a large step generated by dislocation between the traditional choked blocks during adjustment, the quantity of the lifting mechanisms 6 is reduced under the condition of ensuring coating precision, and equipment cost is reduced.

In one embodiment, the lifting mechanism 6 is a servo drive, preferably a miniature linear servo drive.

A sealing contact surface is formed between the upper die head 1 and the lower die head 2, and a high-precision liquid outlet gap 5 is arranged at the front side of the contact surface, so that the discharged viscous slurry can be uniformly coated on a current collector such as aluminum foil or copper foil. The feed passage 11 includes casting surfaces on the surfaces of the upper die 1 and the lower die 2, and the viscous slurry flows along the casting surfaces in the feed passage 11 toward the liquid outlet slit 5. And a plurality of choke blocks 9 driven by miniature linear servo drivers are arranged at the rear end casting surface near the liquid outlet gap 5, and the width dimension of the servo drivers in the arrangement direction is smaller than 20mm. In principle, the smaller this dimension, the smaller the dimension of the flow-blocking piece 9 in the slit direction, the smaller the "differential" straight line segment, and the higher the coating surface density control accuracy. Therefore, in theory, the higher the number of servo drivers, the higher the coating area density control accuracy, but the smaller the size of the servo drivers, the higher the cost thereof, the higher the number of servo drivers, and the higher the total cost thereof, and therefore, there is a need to reduce the number of servo drivers and the cost thereof while ensuring the coating accuracy. The reduction in the number of servo drives means a reduction in the number of driven blocks and an increase in the pitch, that is, a reduction in the coating accuracy, and therefore, how to balance the relationship between the number of servo drives and the coating accuracy is a relatively difficult problem.

In this embodiment, the flexible adjusting piece that can be influenced by external force is adopted as the substitution of the choked flow piece in the vacancy position, the deformability of the flexible adjusting piece is utilized to enable the adjusting change of the choked flow pieces at two ends of the flexible adjusting piece to directly influence the flexible adjusting piece, and the influence is synchronous change of the adjusting trend of the choked flow pieces, so that by utilizing the characteristics, the flexible adjusting piece can still effectively control the precision slurry flow of the liquid outlet gap 5 on the premise of reducing the number of servo drivers, the liquid outlet precision of the liquid outlet gap 5 can be ensured, the relation between the number of the servo drivers and the coating precision is effectively balanced, and the cost of the closed-loop coating die head is greatly reduced. After the flexible adjusting piece 10 is adopted to realize the connection of the two adjacent choked flow blocks 9, the flexible connection of the flexible adjusting piece 10 can be utilized to replace a large step formed by dislocation of the adjacent choked flow blocks, so that the control precision of the coating surface density is effectively improved.

For closed loop coating dies, miniaturization of servo cylinders and flow-blocking blocks is necessary to meet coating tolerance requirements on the order of microns for pole pieces. However, such a micro linear actuator is expensive, and the cost is greatly increased when the micro linear actuator is densely used under the condition of ensuring the coating tolerance requirement.

According to the embodiment, the quantity of the servo drivers is reduced, meanwhile, the defect of the choke block 9 at the position of the vacant servo driver is filled by the flexible adjusting piece, adverse effects on slurry flow accuracy caused by reduction of the servo drivers can be avoided, the cost of the servo drivers is greatly reduced by reducing the quantity of the servo drivers with high price, the cost can be greatly improved, meanwhile, the slurry flow accuracy is not excessively influenced due to reduction of the quantity of the servo drivers, and therefore, the method has high comprehensive benefits, and the comprehensive performance of cost control and accuracy control is better.

In one embodiment, the choke block 9 and the flexible regulating member 10 are made of corrosion resistant materials, since the choke block 9 and the flexible regulating member 10 are both operated in high viscosity slurry for a long period of time. The flexible adjustment member 10 may be made of fluororubber.

In one embodiment, L1 is greater than or equal to L2, that is, the distance between two adjacent lifting mechanisms 6 along the arrangement direction is not less than the width of the lifting mechanisms 6 along the arrangement direction, so that at least half of the lifting mechanisms 6 can be omitted, the free area can be connected between two adjacent choked blocks 9 by adopting a flexible adjusting piece 10, real-time adaptation of the curve length during adjustment of the choked blocks 9 can be realized, and the cost of the closed-loop coating die head can be effectively controlled.

In one embodiment, 1.5×L2. Gtoreq.L1. Gtoreq.L2.

When the distance between two adjacent lifting mechanisms 6 is too large, the length of the flexible adjusting piece 10 between two adjacent choke blocks 9 is too long, so that the stability of the change curve characteristic of the flexible adjusting piece 10 is poor, and the coating precision is affected. Therefore, it is necessary to reasonably control the interval between the two elevating mechanisms 6 so that the effect of the flexible regulating member 10 can be effectively utilized.

In one embodiment, L2 is less than or equal to 20mm, and the largest dimension of the lifting mechanism 6 along the arrangement direction can be defined, the smaller the dimension of the lifting mechanism 6 is, the higher the cost is, and the more obvious the advantage of the embodiment of the utility model in terms of cost is.

Because the flexible adjusting piece 10 is manufactured according to preset specifications, the sectional area of the slurry flowing out in the up-and-down moving process of the flexible adjusting piece 10 can meet a certain rule, the choke block 9 can be adjusted according to the rule, high-precision adjustment of the flexible adjusting piece 10 can be realized, and further high-precision adjustment of the coating surface density can be realized.

In the closed-loop control process, the flow blocking block 9 and the flexible adjusting piece 10 are adjusted in a linkage way for many times, so that the requirement of high consistency of the coating surface density can be met, and the high-precision adjustment of the coating surface density is effectively ensured.

In one embodiment, the choke block 9 is made of a rigid material and can be matched with the flexible adjusting piece 10, and the flexibility of the flexible adjusting piece 10 is controlled more accurately by utilizing the rigidity of the choke block 9, so that the control process is controlled more easily, and the adjustment precision of the coating surface density is further improved.

In one embodiment, the flexible adjustment member 10 is a bellows, a polygonal cylinder, a cylinder, or an elliptical cylinder.

In one embodiment, the cross section shape and the size of the flexible adjusting piece 10 are the same as the shape and the size of the connecting end surface of the choke block 9, so that the consistency of the adjusting characteristic curve when the flexible adjusting piece 10 and the choke block 9 are adjusted in a linkage manner can be further improved, and the coating precision is improved.

The choke block 9 can adopt a polygonal column, a cylinder or an elliptic column structure, and can also adopt other structures capable of conveniently adjusting the slurry flow.

In one embodiment, the choke block 9 adopts a cuboid, the flexible adjusting piece 10 also adopts a cuboid, and the end surfaces of the choke block 9 and the flexible adjusting piece are consistent in shape and size, so that the adjusting precision of the choke block 9 and the flexible adjusting piece during linkage adjustment can be further improved. Because the cuboid flexible adjusting piece 10 has continuity in the deformation process, the width size of the liquid outlet gap 5 can be adjusted more controllably, and the adjusting precision is higher.

In one embodiment, the pitch of the bellows is 1mm to 5mm and the wall thickness of the bellows is 0.8 to 1.2mm.

The bellows structure has better opening degree, and the force required for extension or retraction is smaller, so the required adjusting force is smaller, the driving force requirement for the lifting mechanism 6 is not high, the adjusting requirement for the lifting mechanism 6 can be met, the load requirement for the lifting mechanism 6 is reduced, and the lifting mechanism 6 can also smoothly realize the common adjustment of the choke block 9 and the flexible adjusting piece 10 by adopting a miniature linear lifting mechanism.

In order to ensure the accuracy of the coating surface density or thickness, the pitch dimension of the bellows should be as small as possible, preferably 1 to 2mm.

In one embodiment, the lifting mechanism 6 comprises a drive rod 7, the upper die head 1 comprises a sliding groove arranged at the bottom and communicating with the feed channel 11, and the upper die head 1 is provided with a sealing element 8 in sliding sealing engagement with the drive rod 7 above the sliding groove.

The lifting mechanism 6 drives the choke block 9 to move up and down through the driving rod 7 so as to adjust the slurry outlet amount, thereby controlling the coating surface density.

The sliding groove is used for realizing the up-and-down movement of the choke block 9. The shape of the sliding groove is matched with the shape of the choke block 9, a fit gap is formed between the sliding groove and the choke block, the fit gap is in a preset size range, so that clearance fit is formed between the sliding groove and the choke block, the clearance between the sliding groove and the choke block can be ensured to be discharged for gas, gas extrusion in the moving process of the choke block 9 is avoided, and the influence on the precision of the choke block 9 in the up-and-down moving process caused by overlarge clearance can be avoided.

The sealing piece 8 is arranged between the driving rod 7 and the upper die head 1 in a sealing way and is positioned at the sliding groove of the upper die head 1, so that a seal can be formed between the driving rod 7 and the bottom of the sliding groove, and slurry is prevented from entering into a gap around the driving rod 7.

In one embodiment, the upper surface of the lower die head 2 is provided with at least two liquid storage tanks 4, and the at least two liquid storage tanks 4 are located on the feeding path of the feeding channel 11, and the volumes of the liquid storage tanks 4 gradually decrease along the feeding direction.

The liquid storage tanks 4 can buffer and temporarily store the slurry, reduce fluctuation of the slurry flowing to the liquid outlet gap 5, and ensure that the slurry smoothly and stably flows out from the liquid outlet gap 5.

In this embodiment, the cross-sectional shape of the liquid storage tank 4 is semicircular, so that the impact of the slurry entering the liquid storage tank 4 can be further reduced.

In one embodiment, the upper die head 1 and/or the lower die head 2 are/is provided with a feeding channel 3, and the feeding channel 3 is communicated with the liquid storage tank 4, so that the slurry is conveniently fed into the liquid storage tank 4 through the feeding channel 3, and then is conveyed to the liquid outlet gap 5 through the lower side flow surface of the feeding channel 11.

According to an embodiment of the present utility model, the coating apparatus includes a closed-loop coating die, which is the closed-loop coating die described above.

In one embodiment, the coating apparatus includes a coating head and a coating tail each having a closed loop coating die mounted thereto.

Through installing closed-loop coating die heads respectively at coating aircraft nose and coating tail, can use one set of control system to control two sets of closed-loop coating die heads simultaneously, realize the single face of pole piece and two-sided closed-loop coating control, improve the work efficiency of coating equipment.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. The utility model provides a closed loop coating die head, its characterized in that includes upper die head (1) and lower die head (2) of upper and lower superpose, upper die head (1) with lower die head (2) cooperation form play liquid gap (5) and with play pay-off passageway (11) of liquid gap (5) intercommunication, pay-off passageway (11) are being provided with the adjusting device who adjusts the thick liquids flow in being close to play liquid gap (5) department, adjusting device includes a plurality of elevating system (6) of arranging in proper order, adjacent two width between elevating system (6) is L1, the width of elevating system (6) along the direction of arranging is L2, L1 is greater than or equal to 0.8 L2.

2. Closed loop coating die head according to claim 1, characterized in that the adjusting device further comprises a choke block (9), the choke block (9) is located at the position where the feeding channel (11) is close to the liquid outlet gap (5), the lifting mechanism (6) is arranged on the upper die head (1), the choke block (9) is arranged at the telescopic end of the lifting mechanism (6) and adjusts the width of the liquid outlet gap (5) under the driving action of the lifting mechanism (6), and two adjacent choke blocks (9) are connected through a flexible adjusting piece (10) which is arranged in a suspended manner.

3. The closed loop coating die of claim 2 wherein 1.5 x L2 is greater than or equal to L1 is greater than or equal to L2; and/or L2 is less than or equal to 20mm.

4. Closed loop coating die according to claim 2, characterized in that the flexible regulating member (10) is a bellows, a polygonal cylinder, a cylinder or an elliptic cylinder.

5. Closed loop coating die according to claim 4, characterized in that the cross-sectional shape and size of the flexible adjusting member (10) are the same as the shape and size of the connecting end face of the flow-blocking block (9); and/or the pitch of the corrugated pipe is 1 mm-5 mm, and the wall thickness of the corrugated pipe is 0.8-1.2 mm.

6. Closed loop coating die according to any of claims 1 to 5, characterized in that the lifting mechanism (6) comprises a drive rod (7), the upper die (1) comprises a sliding groove arranged at the bottom and communicating with the feed channel (11), and the upper die (1) is provided with a seal (8) in sliding sealing engagement with the drive rod (7) above the sliding groove.

7. Closed loop coating die according to any of claims 1 to 5, characterized in that at least two reservoirs (4) are provided on the casting surface of the lower die (2), and the volumes of the reservoirs (4) decrease gradually along the feeding direction.

8. Closed loop coating die according to claim 7, characterized in that a feed channel (3) is provided on the upper die (1) and/or the lower die (2), the feed channel (3) being in communication with the reservoir (4).

9. A coating apparatus comprising a closed loop coating die, characterized in that the closed loop coating die is the closed loop coating die of any one of claims 1 to 8.

10. The coating apparatus of claim 9, wherein the coating apparatus comprises a coating head and a coating tail, the coating head and the coating tail each having the closed loop coating die mounted thereto.