CN218655247U

CN218655247U - Throughput valve for precision programmable coating feeding and precision programmable extrusion coating head

Info

Publication number: CN218655247U
Application number: CN202222957447.0U
Authority: CN
Inventors: 杨志明; 吴庆芳; 蔡连贺; 蔡智园; 伍军
Original assignee: Huizhou Xinyuren Technology Co ltd
Current assignee: Huizhou Xinyuren Technology Co ltd
Priority date: 2022-11-07
Filing date: 2022-11-07
Publication date: 2023-03-21
Anticipated expiration: 2032-11-07

Abstract

A precise program-controlled coating feeding type material regurgitation valve and a precise program-controlled extrusion coating head are disclosed, wherein the material regurgitation valve comprises a valve body, a linear driving device, a metering piston which is arranged in a central hole of the valve body and driven by the linear driving device, and a control module which is electrically connected with the linear driving device, and the control module controls the material regurgitation valve to perform material regurgitation action at a thick part and perform material regurgitation action at a thin part according to the data of the coating thickness change rule of an electrode slice in the longitudinal direction within one period which is measured in advance; the throughput valve is configured to throughput over the actual coating thickness at a thick level within the coating area of the same period of electrode sheet coating, and throughput over the coated segment after the segment corresponding to the thickness is averaged over the throughput, such that the entire coating thickness is substantially equal to the actual coating thickness, thereby achieving substantially the same thickness of the electrode material of the electrode sheet in the longitudinal direction.

Description

Precision programmable coating feeding valve and precision programmable extrusion coating head

Technical Field

The utility model relates to a valve is told to the card of accurate programmed type coating feed and accurate programmed type extrusion coating head.

Background

In the prior art, electrode materials (such as electrode materials of lithium batteries, electrode materials of lithium iron phosphate batteries, and the like) are mostly coated on two sides of a traveling substrate by an extrusion coater, and are dried, rolled, sliced, and packaged to form corresponding batteries. In the process of coating the electrode material to the substrate with the extrusion coating machine, the more even better the distribution of electrode material on the substrate, the thickness in the transverse direction and the longitudinal direction of electrode slice is unanimous promptly as being best, the utility model discloses the transverse direction that calls in refers to the direction of travel of pole piece perpendicular to substrate when the coating, and the longitudinal direction refers to the direction unanimous with the direction of travel of substrate when the coating.

In the actual coating process, the thickness of the electrode plate in the transverse direction is well controlled, and the thickness of the electrode plate in the transverse direction can be ensured to be consistent by adjusting a coating gap of an extrusion coating head; however, the thickness of the electrode sheet in the longitudinal direction (seen from the longitudinal section) is influenced by various factors and is always unstable, and the thickness of the electrode sheet coated by the extrusion coating heads of the same type and produced by the same factory is different from the thickness of the electrode sheet coated by the extrusion coating heads in the longitudinal direction after the extrusion coating heads are installed on site; the same machine coater changes the electrode material formula, and even if the same electrode material formula is used, the thickness in the longitudinal direction changes after the electrode material formula is used for a period of time. Therefore, how to ensure that the thickness of the extrusion coater in the longitudinal direction is basically consistent is an urgent problem to be solved in the electrode material coating industry.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the present invention provides a feeding head for extrusion coating of a precise program-controlled type and a throughput valve for program-controlled type, which can realize a substantially uniform thickness of an electrode material of an electrode sheet in a longitudinal direction.

The technical scheme of the utility model is that: the control module is electrically connected with the linear driving device, and controls the material regurgitation action at a thick position and the material regurgitation action at a thin position according to the previously measured data of the coating thickness change rule of the electrode slice in the longitudinal direction in one period; the throughput valve is configured to provide a throughput on a thick portion of a coated area of a same cycle of electrode sheet coating, and to provide an average throughput on a coating segment following a segment corresponding to the thickness such that the total coating thickness is substantially equal to the actual coating thickness, wherein a difference between the throughput and the throughput of the throughput is zero, and the throughput is returned to a starting position.

As an improvement of the utility model, the valve body is a revolving body formed by revolving the section with the I-shaped section and the center hole positioned at the center of the I-shaped section.

As an improvement to the present invention, the linear driving device is a servo linear motor or a linear driving mechanism driven by a servo rotating motor.

As an improvement to the present invention, the linear driving mechanism is a linear nut mechanism.

The utility model also provides a precise program-controlled extrusion coating head for coating and feeding, which comprises an extrusion coating head main body, the aforementioned output valve is provided on a lower side of a storage chamber of a lower lip of an extrusion head of the extrusion head body, and a data output channel of the output valve is connected to the storage chamber.

As right the utility model discloses an improve, the extrusion is scribbled leftover of bolt of cloth main part and is included extrusion head upper lip and extrusion head lower lip, has the extrusion passageway between extrusion head upper lip and the extrusion head lower lip, the material storage chamber intercommunication of extrusion passageway and setting in the extrusion head lower lip.

The utility model adopts the control module to control the material retrying valve to perform the material retrying action at the thick part and the material retrying action at the thin part according to the data of the coating thickness change rule of the electrode slice in the longitudinal direction within a period measured in advance; the throughput valve is in the same period of electrode sheet coating, and the throughput valve draws back unnecessary electrode material at a thick portion to make the thickness at the thick portion become substantially equal to the design thickness, and the electrode material supplied at a thin portion by the throughput valve makes the thickness at the thin portion become substantially equal to the design thickness, so that the utility model has the advantages of can realize that the electrode material of electrode sheet is substantially uniform in thickness in the longitudinal direction.

Drawings

Fig. 1 is a schematic block structure diagram of the method of the present invention.

Fig. 2 is a block diagram of the method of fig. 1, which is further complementary to the method.

Fig. 3 is a schematic longitudinal cross-sectional view of the electrode sheet when the electrode sheet is thick.

Fig. 4 is an enlarged schematic view of a structure at a in fig. 3.

FIG. 5 is a schematic longitudinal cross-sectional view of the electrode sheet with a thick head and a groove in the middle.

Fig. 6 is a diagrammatic illustration of a level of throughput and a level of throughput of a corresponding output valve of fig. 5.

Fig. 7 is a schematic diagram of a configuration of a throughput valve according to the present invention.

Fig. 8 is a schematic structural view of a coating head according to the present invention.

Detailed Description

Referring to fig. 1 and 2, fig. 1 and 2 disclose a method for coating an electrode material using an extrusion coating head with a programmable flow valve controlled by a control module;

the method comprises the following steps:

s1, the control module controls the material regurgitation valve to perform material regurgitation at a thick position and material spitting at a thin position according to the preset coating thickness change rule data of the electrode slice in the longitudinal direction in one period;

s2, the throughput valve is configured to throughput excess material over an actual coating thickness at a thick position within a coating area of a same cycle of electrode sheet coating, and then evenly feedback the throughput excess material to a coating section following a section corresponding to the thickness, such that the entire coating thickness is substantially equal to the actual coating thickness, a difference between the throughput and the throughput of the throughput valve is zero, and then the throughput valve is returned to a start position;

taking the head thickness common in the electrode material coating process as an example to illustrate the application of the present invention, as shown in fig. 3 and 4, the dotted line in fig. 3 is the designed electrode material thickness 32, the line located above the dotted line is the actual coating thickness 35, the actual coating thickness 35 is calculated according to the data of the variation rule of the coating thickness, and if the material throughput (i.e. excess material) is greater than the material throughput, the actual coating thickness 35 is greater than the designed electrode material thickness 32; if throughput (i.e., excess) is equal to throughput, the actual coating thickness 35 is equal to the design electrode material thickness 32; if the throughput (i.e., excess) is less than the throughput, the actual coating thickness 35 is less than the design electrode material thickness 32. In this embodiment, the material throughput is greater than the material throughput, the material belt is traveling along the direction of arrow 30, when the coating starts, for various reasons, a thick portion 31 in the transverse direction is formed at the beginning, which is commonly known as head-thick, the shape of the longitudinal section of the thick portion 31 is circular arc, and the material throughput (i.e. the excess capacity, when the excess capacity is too large, the output capacity of the coating head can be changed to make the excess capacity within a reasonable range) of the material throughput of the material discharge valve is equal to the product (in ml) of the area of the longitudinal section of the thick portion 31 above the actual coating thickness 35 multiplied by the length in the transverse direction; for accurate performance of the data-level increase, the thick portion 31 may be divided into a plurality of smaller segments 311, as shown in fig. 4, wherein a control module controls a flow-level increase to gradually divide the data-level increase for each of the smaller segments 311; after completion of material regurgitation, the material regurgitation is slowly and evenly recirculated to the electrode segments after the thick portion 31 so that the thickness of the electrode material in the subsequent electrode segments is substantially equal to the actual coating thickness 35 (experimental results show that the actual coating thickness 35 is very close to the design electrode material thickness 32 due to slow and even recirculation, which can meet design requirements), thereby ensuring that the metering piston of the material regurgitation valve returns to the start position for the next operation; in summary, in this step, when only the thick portion 31 is present during coating, the thick portion 31 is first subjected to a material-regurgitation, followed by a slow and even regurgitation of the material to electrode segments following the thick portion 31, and finally the metering piston of the valve is returned to its starting position.

The calculation method of the actual coating thickness 35 is as follows: according to the pre-determined coating thickness variation rule data, the measured excess on the design electrode material thickness 32 corresponding to the thick part (one or more parts) is divided by the coating area of the same period to obtain a thickness value, and then the thickness value is added to the design electrode material thickness 32 to obtain the thickness value. The thickness value may be greater than 0, less than 0, or equal to 0. When the material withdrawal amount is greater than the material discharge amount, the thickness value is greater than 0; when the throughput is less than the discharge, the thickness value is less than 0; the thickness is equal to 0 when the throughput is equal to the discharge.

Referring to fig. 5 and 6, fig. 5 and 6 disclose that during the coating process, a thick portion 31 is required to provide a throughput V0, and a first groove 33 and a second groove 34 are provided, wherein the first groove 33 is required to provide a throughput V1 and the second groove 34 is required to provide a throughput V2 (of course, the throughput V0 may be plural, and one or more may be provided). In the present invention, only one thick portion 31 and two grooves are used to illustrate the relationship between the material throughput and the material discharge capacity. As shown in fig. 5 and 6, in this embodiment, the material throughput V0 corresponding to the thick portion 31 is equal to the sum of the first material throughput V1 and the second material throughput V2, and when coating, the excessive material throughput of the material throughput valve above the actual coating thickness 35 (since the material throughput is equal to the material throughput in this embodiment, the actual coating thickness 35 is equal to the designed electrode material thickness 32) corresponding to the electrode length occupied by the thick portion 31, and when coating an electrode with respect to the first groove 33, the material throughput V1 is discharged by the material throughput valve, so as to fill the first groove 33 to the actual coating thickness 35; when the electrode is coated on the opposing second groove 34, the second discharge level V2 is discharged by the valve, the second groove 34 is filled to the actual coating thickness 35, and finally the metering piston of the valve returns to its initial position.

The above analysis shows that the throughput V0 is equal to the sum of the first throughput V1 and the second throughput V2, and the present invention is also suitable for the throughput V0 being greater than the sum of the first throughput V1 and the second throughput V2; or the throughput V0 is smaller than the sum of the first throughput V1 and the second throughput V2.

When the throughput V0 is greater than the sum of the first throughput V1 and the second throughput V2, the throughput V0 minus the sum of the first throughput V1 and the second throughput V2 may be evenly distributed to a length segment of the electrode following the length corresponding to the throughput V0, when encountering the first groove 33, the throughput V1 plus the remaining capacity of the corresponding segment may be output by the throughput valve, and when encountering the second groove 34, the throughput V2 plus the remaining capacity of the corresponding segment may be output by the throughput valve, such that the thickness of the electrode may reach an actual coating thickness 35; finally, returning the metering piston of the exhalation valve to a start position; the method is suitable for situations where the throughput V0 is greater than the throughput.

When the throughput V0 is less than the sum of the first throughput V1 and the second throughput V2, subtracting the throughput V0 from the sum of the first throughput V1 and the second throughput V2 (when the throughput is actually too large, the throughput of the coating head may be changed to bring the throughput within a reasonable range), averaging the throughput over a length segment of the electrode after the length corresponding to the throughput V0, and when encountering the first groove 33, outputting the first throughput V1 by the throughput valve, and when encountering the second groove 34, outputting the second throughput V2 by the throughput valve to bring the thickness of the electrode to the actual coating thickness 35; finally, returning the metering piston of the exhalation valve to the start position; the method is suitable for situations where the throughput V0 is less than the throughput.

S3, stopping coating at a preset distance to form a blank belt;

s4, repeating the steps S1-S3 to coat the electrode material in the next period;

and S5, repeating the step S4 until the coating is finished.

As an improvement to the present invention, there is the following step before the step S1:

s101, taking a plurality of thickness detection points at preset intervals from a starting point to an end point in the longitudinal direction on a dried electrode sheet coated by the same extrusion coating head, and measuring the thickness of the thickness detection points;

and S102, corresponding each thickness detection point to the detected thickness data one by one, establishing the data of the coating thickness change rule of the electrode plate in the longitudinal direction, and storing for later use.

The utility model also provides a precise program-controlled coating feeding type retrying valve, which comprises a valve body 1, a linear driving device 2, a metering piston 3 and a control module 4 which are arranged in the valve body 1 and driven by the linear driving device 2, wherein the control module 4 is electrically connected with the linear driving device 2, and the control module 4 controls the retrying valve to perform retrying action at the thick part and perform retrying action at the thin part according to the data of the coating thickness change rule of the electrode slice in the longitudinal direction in one period measured in advance; the channel may have a zero difference between a throughput and a throughput of the channel during a same cycle of electrode sheet coating.

The valve body 1 is a revolving body formed by revolving a section with an I-shaped section, and the center hole 11 is positioned at the center of the I-shaped section.

Preferably, the linear drive 2 is a servo linear motor.

The linear driving device 2 is composed of a servo rotating motor and a linear driving mechanism driven by the servo rotating motor.

Preferably, the linear drive mechanism is a linear nut mechanism.

The utility model also provides a can be used to the accurate programmed type extrusion coating head of coating feed, including extrusion coating head main part 20, be equipped with above-mentioned material retrying valve 10 below the material storage cavity 211 of the extrusion head lower lip 21 of extrusion coating head main part 20, the material retrying of said material retrying valve 10 is said and the material retrying is said and the material collection channel 11; the storage chamber 211 is connected to a feed pump (not shown) via a feed pipe 212.

Preferably, the extrusion coating head body 20 comprises an extrusion head upper lip 22 and an extrusion head lower lip 21, an extrusion channel 23 is arranged between the extrusion head upper lip 22 and the extrusion head lower lip 21, and the extrusion channel 23 is communicated with a material storage cavity 211 arranged in the extrusion head lower lip 21.

Claims

1. A precision programmable coating feed throughput valve, comprising: the measuring valve comprises a valve body (1), a linear driving device (2), a measuring piston (3) which is arranged in a middle hole (11) of the valve body (1) and driven by the linear driving device (2), and a control module (4), wherein the control module (4) is electrically connected with the linear driving device (2), and the control module (4) controls the material regurgitation and discharge valve to perform the material regurgitation at a thick position and the material spitting at a thin position according to the data of the coating thickness change rule of an electrode slice in one period measured in advance in the longitudinal direction; the throughput valve is configured to provide a throughput on a thick portion of a coated area of a same cycle of electrode sheet coating, and to provide an average throughput on a coating segment following a segment corresponding to the thickness such that the total coating thickness is substantially equal to the actual coating thickness, wherein a difference between the throughput and the throughput of the throughput is zero, and the throughput is returned to a starting position.

2. The precision programmable coating feed valve of claim 1, wherein: the linear driving device (2) is a servo linear motor or a linear driving mechanism driven by a servo rotating motor.

3. The precision programmable coating feed valve of claim 2, wherein: the linear drive mechanism is a linear nut mechanism.

4. A precise program-controlled extrusion coating head is characterized in that: comprising an extrusion coating head body (20) having a stem (10) according to any one of claims 1 to 3 disposed below a storage chamber (211) of an extrusion head lower lip (21) of the extrusion coating head body (20), the stem (10) communicating with the storage chamber (211).

5. A precision programmable extrusion coating head according to claim 4, characterized in that: extrusion coating head main part (20) are including extrusion head upper lip (22) and extrusion head lower lip (21), have extrusion passageway (23) between extrusion head upper lip (22) and the extrusion head lower lip (21), extrusion passageway (23) and the material storage chamber (211) intercommunication of setting in extrusion head lower lip (21).