CN218078717U - Coating device for pole piece - Google Patents

Abstract

The utility model relates to a pole piece processing technology field specifically provides a coating unit for pole piece, aims at solving current pole piece when coating, can't realize the regulatory action to specific surface density distribution curve to influence the problem of pole piece surface density uniformity. Therefore, the utility model discloses a coating device includes coating component, main feed subassembly, supplementary feed subassembly, detection component and control component, and the coating component has feed inlet, main material chamber, even chamber and extrudes the mouth, and even chamber has a plurality of feed supplement holes, and the control component can adjust the feed rate of supplementary feed subassembly orientation every feed supplement hole feed according to the surface density of the pole piece that the detection component detected. Through the arrangement, the feeding speed of the auxiliary feeding assembly for feeding towards each feeding hole is adjusted conveniently according to the surface density of the coated pole piece by the detection component, so that the local surface density on the pole piece can be changed rapidly, and the closed-loop control of the surface density in the pole piece coating process is realized.

Description

Coating device for pole piece

Technical Field

The utility model relates to a pole piece processing technology field specifically provides a coating unit for pole piece.

Background

At present, with the rapid development of new energy automobiles, higher requirements are put forward on the consistency and the cost of lithium batteries, and the surface density control capability of a coating process directly determines the consistency among the batteries and influences the capacity and the safety performance of the batteries; simultaneously, with the continuous violent rise of the price of raw materials, the cost reduction requirement of lithium battery production and manufacturing is more urgent, and the cost reduction and the efficient production of the lithium battery manufacturing must be realized under the condition of meeting the quality requirement of the lithium battery.

When the prior coating device performs closed-loop control on the surface density, the transverse surface density is effectively adjusted by adding a T-shaped block or a push-pull rod on a die head, but the adjustment mode only acts on a local area, the adjustment effect on a specific surface density distribution curve of the prior pole piece can not be realized, the adjustment effect of the die head according to the transverse surface density is limited when the prior pole piece is coated, the adjustment effect on the specific surface density distribution curve can not be realized, and the consistency of the surface density of the pole piece is influenced.

Therefore, there is a need in the art for a new solution to the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving above-mentioned technical problem, promptly, solve current pole piece when coating, can't realize the regulatory action to specific surface density distribution curve to influence the problem of pole piece surface density uniformity.

The utility model provides a coating unit for pole piece, this coating unit includes: the coating component is provided with a feed inlet, a main material cavity, a uniform cavity and an extrusion opening which are sequentially communicated, and the uniform cavity is provided with a plurality of material supplementing holes which are distributed at intervals along the length direction of the uniform cavity; the main feeding assembly is communicated with the feeding hole; an auxiliary feed assembly in communication with the feed supplement hole; a detecting member provided at a downstream end of the coating member, the detecting member being for detecting an areal density of the pole piece after being coated by the coating member; and the control component is in communication connection with the detection component and the auxiliary feeding assembly, and can adjust the feeding speed of the auxiliary feeding assembly towards each feeding hole according to the area density of the pole piece detected by the detection component.

In a preferred technical solution of the above coating apparatus, the auxiliary supply assembly includes a plurality of supply channels and a plurality of supply members, the supply members are in communication connection with the control member, one end of each of the plurality of supply channels is communicated with the corresponding feeding hole, and the other end of each of the plurality of supply channels is communicated with the supply member.

In a preferred embodiment of the above coating apparatus, the coating member includes an upper die head and a lower die head which are oppositely disposed, and a gasket disposed between the upper die head and the lower die head, the feed opening, the main material chamber, and the uniform chamber are all disposed on the lower die head, and the extrusion opening is formed between the upper die head and the lower die head and located at the edge of the upper die head and the lower die head.

In a preferred technical scheme of the coating device, the feeding hole is formed in the bottom of the uniform cavity, and the feeding runner is formed in the lower die head and is perpendicular to the uniform cavity.

In the above-mentioned coating apparatus, the supply member includes an auxiliary supply pipeline, an auxiliary storage tank, an auxiliary supply pump and an electric control regulating valve disposed on the auxiliary supply pipeline, the electric control regulating valve is in communication connection with the control member, the number of the auxiliary supply pipeline is plural, one end of the auxiliary supply pipeline is communicated with the corresponding supply flow channel, and the other end of the auxiliary supply pipeline is communicated with the auxiliary storage tank through the auxiliary supply pump.

In a preferred embodiment of the above coating apparatus, the number of the auxiliary supply pumps is at least two, and each of the auxiliary supply pumps is communicated with at least two of the auxiliary supply pipes.

In a preferred technical scheme of the coating device, the distance between the uniform cavity and the extrusion opening is 15-35mm.

In a preferable technical scheme of the coating device, the width of the uniform cavity is 10-25mm, and the depth of the uniform cavity is 40-100mm.

In the preferable technical scheme of the coating device, the distance between the supplement holes close to the edge of the uniform cavity and the edge of the extrusion opening is 5-35mm, and the distance between two adjacent supplement holes is 40-100mm.

In a preferred technical solution of the above coating apparatus, the main feeding assembly includes a main feeding pipeline, a main storage tank and a main feeding pump, one end of the main feeding pipeline is communicated with the feeding port, and the other end of the main feeding pipeline is communicated with the main storage tank through the main feeding pump.

Under the condition that adopts above-mentioned technical scheme, through set up a plurality of feed holes in even intracavity, be convenient for make auxiliary feed subassembly feed towards the feed hole, and through setting detection component and auxiliary feed subassembly to be connected with the control component communication, can detect the areal density of pole piece after the coating according to the detection component, make the control component control auxiliary feed subassembly carry out the feed speed of feeding towards every feed hole, thereby can change the areal density of different positions on the width direction along the pole piece fast, and then realize the closed-loop control of the areal density of pole piece coating in-process.

Furthermore, the feeding speed of the feeding component for feeding towards the feeding flow channel can be controlled by connecting the feeding component with the control component in a communication manner, so that the feeding speed of the feeding component for feeding towards the feeding hole can be conveniently controlled, and compared with the mode that the control valve is arranged in the feeding flow channel and is connected with the control component in a communication manner, the auxiliary feeding assembly can be more conveniently mounted and dismounted by connecting the feeding component with the control component in a communication manner, so that the auxiliary feeding assembly can be conveniently maintained or debugged; through setting up a plurality of feed runners and making a plurality of feed runners's one end and corresponding feed supplement hole intercommunication, a plurality of feed runners's the other end all communicates with the feed component, can conveniently carry out independent feed to every feed supplement hole to be convenient for change along the local areal density of the different positions in the width direction of pole piece, realize the accurate control of pole piece areal density.

Still further, the coating member is arranged in the form of an upper die head, a lower die head and a gasket, so that the coating member is convenient to mount and dismount, and on one hand, the coating member can be repaired or parts can be replaced by dismounting the coating member, so that the maintenance time of the coating member is reduced; on the other hand, be convenient for wash feed inlet, main material chamber and even chamber, thereby prevent to sneak into the coating effect that influences the pole piece in the thick liquids because of remaining material sediment in the coating component to avoid influencing the quality of pole piece.

Still further, through setting up the feed supplement hole in the bottom in even chamber, compare with the feed supplement hole setting on the lateral wall in even chamber, can prevent that the thick liquids from overflowing from even intracavity after the feed supplement hole supplyes the even intracavity, thereby avoid causing the thick liquids to disturb, set up the feed runner in the die head down and with even chamber vertical setting, can shorten the distance between feed component and the feed supplement hole, reduce the time that the thick liquids flows along the feed runner, make the speed of feed towards the feed supplement hole faster, thereby make the surface density's of pole piece control more accurate, and then improve the uniformity of pole piece.

Furthermore, the auxiliary feeding pipeline is provided with the electric control regulating valves, so that the electric control regulating valves are convenient to mount, and meanwhile, the accurate control of the feeding speed of each feeding flow channel can be realized by regulating each electric control regulating valve; through the setting of supplementary feed pump, can make the thick liquids in the supplementary storage tank carry the feed runner through supplementary feed pipeline automatically in, improve the feed speed of supplementary feed to be convenient for carry out accurate control to the areal density of pole piece.

Furthermore, the number of the auxiliary feeding pumps can be reduced by communicating each auxiliary feeding pump with at least two auxiliary feeding pipelines, so that the cost of the coating device is reduced, and the production cost of the pole piece is reduced; through setting up two supplementary feed pumps at least, compare with only setting up a supplementary feed pump, can reduce the quantity with the corresponding feed supplement hole of supplementary feed pump to improve the supplementary feed pump and carry out the feed precision of feeding towards every feed supplement hole, and then improve the surface density closed-loop control's of pole piece precision.

Furthermore, the distance between the uniform cavity and the extrusion port is set to be 15-35mm, so that on one hand, the slurry can be prevented from being disturbed due to the fact that the distance between the uniform cavity and the extrusion port is too short, and the influence on the stability of the surface density of the pole piece is avoided; on the other hand, the uniform effect of the uniform cavity can be prevented from being deteriorated due to the overlong distance between the uniform cavity and the extrusion opening.

Furthermore, the width of the uniform cavity is set to be 10-25mm, so that the influence on the arrangement of the material supplementing hole due to the too narrow width of the uniform cavity can be avoided, and meanwhile, the reduction of the adjusting effect on the surface density of the pole piece due to the too wide width of the uniform cavity can also be prevented; the depth of the uniform cavity is set to be 40-100mm, so that the slurry can be prevented from being disturbed due to the fact that the uniform cavity is too shallow, the uniform effect is influenced, meanwhile, the accuracy and the sensitivity of adjustment of the surface density of the pole piece can be prevented from being reduced due to the fact that the uniform cavity is too deep, and the control effect of closed-loop control on the surface density of the pole piece is prevented from being influenced.

Furthermore, the distance between the feeding holes close to the edge of the uniform cavity and the edge of the extrusion port is set to be 5-35mm, so that slurry disturbance caused by the fact that the feeding holes on the two sides of the uniform cavity are too close to the edge of the extrusion port can be prevented, and the stability of the surface density of the pole piece is influenced; the distance between two adjacent feeding holes is set to be 40-100mm, so that the poor surface density adjusting effect of the pole piece caused by the overlarge distance between the two adjacent feeding holes can be prevented, and meanwhile, the disturbance of slurry entering the uniform cavity from the two feeding holes due to the undersize distance between the two adjacent feeding holes can be prevented from affecting the adjusting effect of the surface density of the pole piece.

Still further, through setting main feed subassembly to main feed pipeline, main storage tank and main feed pump, can realize automatic feed, improve the coating efficiency of pole piece, simultaneously, can control the feed speed of main storage tank towards the feed inlet feed through main feed pump, be convenient for improve the surface density stability of pole piece in the coating process.

Drawings

Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

fig. 1 is a schematic connection diagram of a coating apparatus according to the present invention;

FIG. 2 is a schematic structural view of a coating apparatus of the present invention;

FIG. 3 is a schematic view of the coating member, the main feed assembly and the auxiliary feed assembly of the present invention;

fig. 4 is a schematic structural view of the lower die head of the present invention;

FIG. 5 is a first schematic structural diagram of a pole piece after being coated by the coating apparatus of the present invention;

fig. 6 is a schematic structural diagram of a pole piece after being coated by the coating device of the present invention.

List of reference numerals:

1. a coating member; 11. an upper die head; 12. a lower die head; 121. a feed inlet; 122. a main material cavity; 123. a homogenization cavity; 1231. a feeding hole; 124. an extrusion port; 13. a gasket; 14. a bolt; 15. a slurry passage; 21. a main storage tank; 22. a main feed conduit; 23. a main feed pump; 3. an auxiliary feeding assembly; 31. a feed runner; 321. an auxiliary feed conduit; 3211. an electrically controlled regulating valve; 322. an auxiliary storage tank; 323. an auxiliary feed pump; 4. a detecting member; 5. a control member; 6. a backing roller member; 7. a roll-over member; 8. pole pieces; 81. a coating area; 9. an oven; 10. an unwinding member.

Detailed Description

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the components in the drawings are illustrated in a certain ratio, the ratio is not constant, and those skilled in the art can make modifications as needed to adapt to specific applications, and the modified embodiments will still fall within the scope of the present invention.

It should be noted that in the description of the present invention, the terms "bottom", "upper", "lower", "inner", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Furthermore, it should be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," and "connected" in the description of the present invention are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1 to 4, wherein, fig. 1 is a connection schematic diagram of the coating apparatus of the present invention, fig. 2 is a structural schematic diagram of the coating apparatus of the present invention, fig. 3 is a structural schematic diagram of the coating member, the main feeding assembly and the auxiliary feeding assembly of the present invention, and fig. 4 is a structural schematic diagram of the lower die head of the present invention.

As shown in fig. 1 to 4, the coating apparatus of the present invention includes a coating member 1, a main feeding assembly, an auxiliary feeding assembly 3, a detecting member 4, and a control member 5.

The coating member 1 has a feed inlet 121, a main material cavity 122, a uniform cavity 123 and an extrusion opening 124 which are sequentially communicated, the feed inlet 121, the main material cavity 122, the uniform cavity 123 and the extrusion opening 124 are horizontally distributed at intervals, and the uniform cavity 123 has a plurality of feeding holes 1231 which are distributed at intervals along the length direction of the uniform cavity 123.

The main feed assembly is communicated with the feed inlet 121 and can supply slurry to the feed inlet 121, the auxiliary feed assembly 3 is communicated with the supplementary feed hole 1231 and can supplement slurry to the supplementary feed hole 1231, and the coating member 1 can extrude the slurry entering the coating member 1 from the feed inlet 121 from the extrusion opening 124 and coat the pole piece 8.

The detecting component 4 is arranged at the downstream end of the coating component 1, the detecting component 4 is used for detecting the surface density of the pole piece 8 coated by the coating component 1, the control component 5 is in communication connection with the detecting component 4 and the auxiliary feeding assembly 3, and the control component 5 can adjust the feeding speed of the auxiliary feeding assembly 3 towards each feeding hole 1231 according to the surface density of the coated pole piece 8 detected by the detecting component 4.

Through such setting, through set up a plurality of feed supplement holes 1231 in even chamber 123, be convenient for make supplementary feed subassembly 3 feed towards feed supplement hole 1231, and through setting detection component 4 and supplementary feed subassembly 3 to be connected with control component 5 communication, can detect the surface density of pole piece 8 after the coating according to detection component 4, make control component 5 control supplementary feed subassembly 3 carry out the feed speed of feeding towards every feed supplement hole 1231, thereby can change the surface density of different positions on the width direction along pole piece 8 fast, and then realize the closed-loop control of the surface density of pole piece 8 coating in-process.

Preferably, as shown in fig. 2, the auxiliary supply assembly 3 comprises a supply flow channel 31 and a supply member, the supply member is connected to the control member 5 in communication, the number of the supply flow channels 31 is multiple, one end of each of the plurality of supply flow channels 31 is communicated with a corresponding supplementary feed hole 1231, and the other end of each of the plurality of supply flow channels 31 is communicated with the supply member.

With such an arrangement, on one hand, the communication connection of the feeding member with the control member 5 can control the feeding speed of the feeding member to the feeding channel 31, thereby facilitating the control of the feeding speed of the feeding member to the feeding hole 1231, and compared to the arrangement of the electrically controlled valve in the feeding channel 31, which allows the communication connection of the electrically controlled valve with the control member 5, the communication connection of the feeding member with the control member 5 can facilitate the installation and removal of the auxiliary feeding assembly 3, thereby facilitating the maintenance or the debugging of the auxiliary feeding assembly 3; on the other hand, through setting up a plurality of feed runners 31 and making a plurality of feed runners 31 one end and corresponding feed supplement hole 1231 intercommunication, a plurality of feed runners 31's the other end all communicates with the feed component, can conveniently carry out independent feed to every feed supplement hole 1231 to be convenient for change along the local areal density of different positions on the width direction of pole piece 8, realize the accurate control of pole piece 8's areal density.

It should be noted that, in practical applications, a person skilled in the art may also arrange the auxiliary feeding assembly 3 to provide an electric control valve in the feeding channel 31, and connect the electric control valve to the control member 5 in a communication manner, and so on, and such adjustment and change of the specific communication mode between the auxiliary feeding assembly 3 and the control member 5 do not deviate from the principle and scope of the present invention, and all should be included in the protection scope of the present invention. Of course, it is preferably provided that the supply means are in communication with the control means 5 as described above.

It should be noted that, in practical applications, a person skilled in the art may set the supply flow channel 31 as a plurality of independent channels disposed in the coating member 1, and make one end of each channel communicate with the corresponding feeding hole 1231, and make the other end of each channel communicate with the supply member, or may set the supply flow channel 31 as a plurality of independent pipes inserted into the coating member 1, and make one end of each pipe communicate with the corresponding feeding hole 1231, and make the other end of each pipe communicate with the supply member, etc., and such adjustment and change of the specific structural form of the supply flow channel 31 do not depart from the principle and scope of the present invention, and all should be included in the protection scope of the present invention.

Illustratively, as shown in fig. 2, the supply flow channel 31 is provided as a plurality of independent channels opened in the coating member 1, and one end of each channel is made to communicate with the corresponding feed holes 1231, and the other end of each channel is made to communicate with the supply member.

Furthermore, it should be noted that, in practical applications, a person skilled in the art may set the feeding member as an auxiliary feeding pipe 321 and an auxiliary feeding pump 323, wherein one end of the auxiliary feeding pipe 321 has a plurality of branches, the plurality of branches are respectively communicated with the corresponding feeding flow passages 31, the other end of the auxiliary feeding pipe 321 is communicated with the auxiliary feeding pump 323, and an electrically controlled adjusting valve is disposed in each branch, or, the feeding member may also be set as a plurality of auxiliary feeding pipes 321 and a plurality of auxiliary feeding pumps 323, wherein one end of each auxiliary feeding pipe 321 is respectively communicated with the corresponding feeding flow passages 31, the other end of each auxiliary feeding pipe 321 is respectively communicated with the auxiliary feeding pump 323, or, the feeding member may also be set as a plurality of auxiliary feeding pipes 321 and a plurality of auxiliary feeding pumps 323, wherein one end of each auxiliary feeding pipe 321 is respectively communicated with the corresponding feeding flow passages 31, the other ends of at least two auxiliary feeding pipes 321 are communicated with the auxiliary feeding pump 323, and so on, such that the adjustment and the change are flexible and do not deviate from the protection scope of the present invention.

Preferably, as shown in fig. 2 and 3, the feeding member includes an auxiliary feeding pipe 321, an auxiliary storage tank 322, an auxiliary feeding pump 323, and an electrically controlled adjusting valve 3211 disposed on the auxiliary feeding pipe 321, the electrically controlled adjusting valve 3211 is in communication with the control member 5, the auxiliary feeding pipe 321 is provided in a plurality, one end of each of the plurality of auxiliary feeding pipes 321 is in communication with a corresponding feeding channel 31, and the other end of each of the plurality of auxiliary feeding pipes 321 is in communication with the auxiliary storage tank 322 through the auxiliary feeding pump 323.

Through the arrangement, on one hand, the electric control regulating valves 3211 are arranged on the auxiliary feeding pipeline 321, so that the electric control regulating valves 3211 are convenient to install, and meanwhile, the opening degree of each electric control regulating valve 3211 can be regulated, so that the feeding speed of each feeding flow channel 31 can be accurately controlled; on the other hand, through the setting of supplementary feed pump 323, can make the thick liquids in the supplementary storage tank 322 carry the feed runner 31 through supplementary feed pipeline 321 automatically in, improve the feed speed of supplementary feed subassembly 3 to be convenient for carry out accurate control to the areal density of pole piece 8.

It should be noted that, in practical applications, those skilled in the art can set the number of the auxiliary feeding pumps 323 to one, and the plurality of auxiliary feeding pipes 321 are all communicated with the auxiliary feeding pumps 323, or can set the number of the auxiliary feeding pumps 323 to two, and at least two auxiliary feeding pipes 321 are communicated with one auxiliary feeding pump 323, and further, the number of the auxiliary feeding pumps 323 can be set to be the same as the number of the auxiliary feeding pipes 321, so that the auxiliary feeding pumps 323 and the auxiliary feeding pipes 321 are in one-to-one correspondence and are communicated with each other, and so on, and such flexible adjustment and change do not deviate from the principles and scope of the present invention, which should be included in the protection scope of the present invention.

Preferably, as shown in fig. 3, the number of the auxiliary feed pumps 323 is at least two, and each of the auxiliary feed pumps 323 communicates with at least two of the auxiliary feed pipes 321.

Through the arrangement, on one hand, the number of the auxiliary feeding pumps 323 can be reduced, so that the cost of the coating device is reduced, and the production cost of the pole piece 8 is reduced; on the other hand, by providing at least two auxiliary feed pumps 323, the number of the supplementary feed holes 1231 corresponding to the auxiliary feed pumps 323 can be reduced as compared with the case where only one auxiliary feed pump 323 is provided, so that the accuracy of feeding the auxiliary feed pumps 323 to each supplementary feed hole 1231 can be improved, and the accuracy of the closed-loop control of the area density of the pole piece 8 can be improved.

Preferably, as shown in fig. 3, the main feeding assembly includes a main feeding pipe 22, a main storage tank 21 and a main feeding pump 23, one end of the main feeding pipe 22 is communicated with the feeding port 121, and the other end of the main feeding pipe 22 is communicated with the main storage tank 21 through the main feeding pump 23.

Through such setting, can realize automatic feed, improve pole piece 8's coating efficiency, simultaneously, can control the feed rate of main storage tank 21 towards feed inlet 121 feed through main feed pump 23, be convenient for improve pole piece 8's surface density stability in the coating process.

It should be noted that, in practical applications, those skilled in the art may set both the main feeding pump 23 and the auxiliary feeding pump 323 as screw pumps, or may set both the main feeding pump 23 and the auxiliary feeding pump 323 as start-up diaphragm pumps, etc., and such adjustment and change to the specific setting type of the main feeding pump 23 and the auxiliary feeding pump 323 do not deviate from the principle and scope of the present invention, which should be included in the protection scope of the present invention.

Preferably, the main feed pump 23 and the auxiliary feed pump 323 are both provided as screw pumps.

Preferably, as shown in fig. 1 and fig. 2, the coating apparatus further includes an unwinding member 10 and a back roll member 6, the unwinding member 10 unwinds the wound pole piece 8 and then bypasses the back roll member 6 to pass the pole piece 8 through the extrusion opening 124 in sequence, and the slurry extruded from the extrusion opening 124 of the coating member 1 is coated on the pole piece 8 in sequence.

Through the arrangement, on one hand, the unwinding speed of the pole piece 8 can be increased through the arrangement of the unwinding member 10, so that the coating efficiency of the pole piece 8 is increased; on the other hand, by the provision of the backing roller member 6, it is possible to provide a supporting force for the pole piece 8 at the time of coating, while it is possible to guide the pole piece 8 after coating to the detecting member 4.

It should be noted that, in practical applications, the back roll member 6 can be fixed relative to the coating member 1 by a person skilled in the art, or the back roll member 6 can be moved toward the direction close to or away from the coating member 1, and so on, and such flexible adjustment and change do not depart from the principle and scope of the present invention, and all shall be included in the protection scope of the present invention.

Preferably, the backing roller member 6 is provided so as to be movable in a direction to approach or separate from the coating member 1.

With this arrangement, it is convenient to adjust the gap between the pole piece 8 and the extrusion port 124 according to the coating thickness of the slurry.

Preferably, as shown in fig. 2, the coating device further includes a roller member 7, and the roller member 7 can provide a supporting force for the coated pole piece 8, and at the same time, can guide and convey the coated pole piece 8 to the detection member 4.

Through the arrangement, on one hand, the stability of the pole piece 8 after coating is improved conveniently through the supporting effect of the roller passing member 7; on the other hand, the guide action of the roller member 7 facilitates the coated pole piece 8 to pass through the detection member 4 accurately, so that the detection member 4 can detect the surface density of the coated pole piece 8 conveniently.

Preferably, as shown in fig. 1, the coating apparatus further includes an oven 9 disposed at the downstream end of the detection member 4, and when the pole piece 8 is conveyed to the detection member 4 for detection after being coated, the detected pole piece 8 enters the oven 9 for drying treatment.

With such an arrangement, the feeding speed of the auxiliary feeding assembly 3 towards the feeding holes 1231 can be rapidly adjusted according to the areal density detection data of the coated pole pieces 8, so that the adjustment of the areal density of the pole pieces 8 is faster and more accurate than if the oven 9 were arranged at the upstream end of the detection member 4.

It should be noted that, in practical application, a person skilled in the art can set the detecting member 4 as an areal density detector, and directly measure the areal density of the coated pole piece 8, or, can also set the detecting member 4 as a thickness detector, measure the thickness of the coated pole piece 8, and calculate the areal density of the pole piece 8 according to the measured thickness, and so on, and such adjustment and change to the specific setting type of the detecting member 4 are not deviated from the principle and scope of the present invention, which should be included in the protection scope of the present invention.

Preferably, the detection member 4 is provided as an area density detector.

Through such setting, through setting up the detection component 4 to the surface density detector promptly, compare with setting up the detection component 4 to the thickness detector, can the direct detection pole piece 8 go up the surface density of each part, need not to detect the thickness of each part on the pole piece 8 earlier and carry out the calculation of surface density again, thereby make the detection of surface density more accurate, and simultaneously, the detection speed is faster, be convenient for adjust the feed rate of supplementary feed subassembly 3 towards feed supplement hole 1231 feed fast according to the testing result of detection component 4, improve pole piece 8's surface density closed-loop control's control accuracy.

It should be noted that, in practical applications, a person skilled in the art may set the coating member 1 to be an integrated structure, wherein the feeding hole 121, the main material cavity 122, the uniform cavity 123 and the extrusion opening 124 are respectively located inside the integrated coating member 1, or may also set the coating member 1 to be a split structure composed of the upper die 11, the lower die 12 and the gasket 13 disposed between the upper die 11 and the lower die 12, wherein the feeding hole 121, the main material cavity 122, the uniform cavity 123 and the extrusion opening 124 are respectively located between the upper die 11 and the lower die 12, and so on, and such adjustment and change of the specific structural form of the coating member 1 do not deviate from the principle and scope of the present invention, and all should be included in the protection scope of the present invention.

Preferably, as shown in fig. 2 to 4, the coating member 1 includes an upper die 11 and a lower die 12 which are oppositely arranged, and a gasket 13 which is arranged between the upper die 11 and the lower die 12, the feed inlet 121, the main material cavity 122 and the uniform cavity 123 are all arranged on the lower die 12, the extrusion opening 124 is formed between the upper die 11 and the lower die 12 and is located at the edge of the upper die 11 and the lower die 12, the upper die 11 and the lower die 12 are fixed by a plurality of bolts 14, and a slurry channel 15 for slurry to pass is defined by the upper die 11, the lower die 12 and the gasket 13 together, and the main material cavity 122 and the uniform cavity 123 are sequentially distributed on the slurry channel 15.

By such arrangement, the coating member 1 can be conveniently mounted and dismounted, and on one hand, the coating member 1 can be repaired or parts can be replaced by dismounting the coating member 1, so that the maintenance time of the coating member 1 is reduced; on the other hand, be convenient for wash feed inlet 121, main material chamber 122 and even chamber 123, thereby prevent to mix into the thick liquids because of remaining material sediment in the coating component 1 and influence the coating effect of pole piece 8 in to avoid influencing the quality of pole piece 8.

It should be noted that, in practical application, it is not limited to set the feed inlet 121, the main material cavity 122 and the uniform cavity 123 on the lower die head 12, for example, the feed inlet 121, the main material cavity 122 and the uniform cavity 123 may be set on the upper die head 11, or the cavities may be set on the relative positions of the upper die head 11 and the lower die head 12, the corresponding cavities on the upper die head 11 and the lower die head 12 form the feed inlet 121, the main material cavity 122 and the uniform cavity 123, etc., and such flexible adjustment and change do not deviate from the principles and ranges of the present invention should be included in the protection scope of the present invention. It is of course preferred that the feed inlet 121, the main material chamber 122 and the homogenizing chamber 123 are all provided on the lower die 12.

It should be noted that, in practical applications, the skilled person can set the feeding hole 1231 on the bottom wall of the uniform cavity 123, or can set the feeding hole 1231 on the side wall of the uniform cavity 123, and so on, and such adjustment and change to the specific setting position of the feeding hole 1231 in the uniform cavity 123 do not deviate from the principle and scope of the present invention, and all should be included in the protection scope of the present invention.

It should be noted that, in practical applications, a person skilled in the art can set the supply channel 31 to be perpendicular to the uniform cavity 123, or can set the supply channel 31 to be inclined with respect to the uniform cavity 123, etc., and such flexible adjustment and change do not deviate from the principle and scope of the present invention, which should be included in the protection scope of the present invention.

Preferably, as shown in FIG. 2, the feeding hole 1231 is disposed at the bottom of the homogenizing chamber 123, and the supply flow channel 31 is disposed in the lower die head 12 and is perpendicular to the homogenizing chamber 123.

By such an arrangement that the supplementary material hole 1231 is disposed at the bottom of the uniform chamber 123, compared with the arrangement that the supplementary material hole 1231 is disposed on the side wall of the uniform chamber 123, the slurry can be prevented from overflowing from the uniform chamber 123 after being replenished from the supplementary material hole 1231 into the uniform chamber 123, thereby avoiding causing slurry interference; set up feed runner 31 in lower die head 12 and with even chamber 123 vertical setting, can shorten the distance between feed component and the feed supplement hole 1231, reduce the time that thick liquids flowed along feed runner 31 for the speed of feed towards feed supplement hole 1231 is faster, thereby makes the control of the areal density of pole piece 8 more accurate, and then improves the uniformity of pole piece 8.

Preferably, as shown in FIG. 4, the distance B between the center of the uniform chamber 123 and the extrusion port 124 is set to 15-35mm, and further preferably, the distance B between the uniform chamber 123 and the extrusion port 124 is set to 25mm.

Through the arrangement, on one hand, the slurry can be prevented from being disturbed due to the fact that the distance between the uniform cavity 123 and the extrusion opening 124 is too short, and therefore the stability of the surface density of the pole piece 8 is prevented from being influenced; on the other hand, it is possible to prevent the uniformity effect of the uniformity chamber 123 from being deteriorated due to an excessively long distance between the uniformity chamber 123 and the extrusion outlet 124.

Preferably, as shown in FIG. 4, the width D of the uniform cavity 123 is set to 10-25mm and the depth of the uniform cavity 123 is set to 40-100mm, and further preferably, the width D of the uniform cavity 123 is set to 15mm and the depth of the uniform cavity 123 is set to 70mm.

Through the arrangement, on one hand, the influence on the arrangement of the material supplementing hole 1231 caused by the excessively narrow width of the uniform cavity 123 can be avoided, and meanwhile, the effect of reducing the adjustment effect on the surface density of the pole piece 8 caused by the excessively wide width of the uniform cavity 123 can also be prevented; on the other hand, can prevent to make the thick liquids appear the disturbance because of even chamber 123 is too shallow to influence even effect, simultaneously, also can prevent to reduce the accuracy and the sensitivity to the regulation of pole piece 8 areal density because of even chamber 123 is too deep, thereby avoid influencing the control effect to the closed-loop control of pole piece 8 areal density.

With continuing reference to fig. 4 and with continuing reference to fig. 5, fig. 5 is a first schematic structural diagram of a pole piece after being coated by the coating apparatus of the present invention.

As shown in fig. 4 and fig. 5, the slurry is coated on the pole piece 8 to form a coating area 81, the coating width a of the pole piece 8 is the width of the coating area 81, and the width W of the slurry channel 15 enclosed by the upper die head 11, the lower die head 12 and the shim 13 is the same as the coating width a of the pole piece 8, wherein the slurry channel 15 has an opening, and the size of the opening is the same as the size of the extrusion opening 124.

It should be noted that, in practical applications, a person skilled in the art can set the coating width a of the pole piece 8 to a fixed value, or can adjust the coating width a of the pole piece 8 by adjusting the size of the spacer 13, thereby realizing the coating of the pole pieces 8 with various widths, improving the application range of the coating device, accordingly, the length of the extrusion opening 124 is also adjusted according to the size of the spacer 13, and so on, and such flexible adjustment and change does not deviate from the principles and ranges of the present invention should be included in the protection scope of the present invention.

Preferably, as shown in fig. 5, the size of the coating width a is 100-1200mm, and further preferably, the coating width a is set to 1000mm.

With continuing reference to fig. 5 and with further reference to fig. 6, fig. 6 is a schematic structural diagram of a pole piece after being coated by the coating apparatus of the present invention.

Preferably, as shown in fig. 4 and 5, the coating device can realize a single-line coating (as shown in fig. 5), a double-line coating (as shown in fig. 6) or a multi-line coating by adjusting the shape and size of the spacer 13.

Through the arrangement, the coating device is suitable for closed-loop control of the surface density of single-width coating and multi-width coating under different working conditions, and the application range of the coating device is widened.

Preferably, as shown in FIG. 4, the distance L1 between the feeding holes 1231 near the edge of the uniform lumen 123 and the edge of the extrusion port 124 is set to 5-35mm, the distance L2 between two adjacent feeding holes 1231 is set to 40-100mm, and further preferably, the distance L1 between the feeding holes near the edge of the uniform lumen 123 and the edge of the extrusion port 124 is set to 20mm, and the distance L2 between two adjacent feeding holes 1231 is set to 60mm.

Through the arrangement, on one hand, slurry disturbance caused by the fact that the supplementary feeding holes 1231 on the two sides of the uniform cavity 123 are too close to the edge of the extrusion port 124 can be prevented, and therefore the stability of the surface density of the pole piece 8 is affected, and on the other hand, the situation that the surface density of the pole piece 8 close to the edge of the coating area 81 cannot be adjusted due to the fact that the supplementary feeding holes 1231 on the two sides of the uniform cavity 123 are too far from the edge of the extrusion port 124 can be prevented, and therefore the consistency of the surface density of the pole piece 8 is affected; on the other hand, the poor adjustment effect of the surface density of the pole piece 8 caused by the excessively large distance between two adjacent feeding holes 1231 can be prevented, and meanwhile, the disturbance of the slurry entering the uniform cavity 123 from the two feeding holes 1231 caused by the excessively small distance between the two adjacent feeding holes 1231 can be prevented, so that the adjustment effect of the surface density of the pole piece 8 is influenced.

The following describes a specific embodiment of the coating apparatus of the present invention in performing the areal density control of the pole piece 8 in detail with reference to fig. 1 to 4.

As shown in fig. 1 to 4, during the coating process, when the main supply assembly supplies the slurry to the feed port 121 and the slurry entering the coating member 1 from the feed port 121 flows into the main chamber 122, the slurry flows along the length direction of the main chamber 122, and at the same time, the slurry in the main chamber 122 also overflows the main chamber 122 and flows along the slurry channel 15 towards the uniform chamber 123, when the slurry flows into the uniform chamber 123, the slurry flows along the length direction of the uniform chamber 123 first, so that the slurry is uniformly distributed along the length direction of the uniform chamber 123, and at the same time, the auxiliary supply assembly 3 feeds the slurry to the feed hole 1231 through the supply flow channel 31 at a certain speed, and when the uniform chamber 123 is filled with the slurry, the slurry overflows from the uniform chamber 123 and flows along the slurry channel 15 towards the extrusion port 124, and is finally extruded through the extrusion port 124 and coated on the surface of the pole piece 8.

Illustratively, when the detecting means 4 detects that the local area density of the post-coating pole piece 8 in the width direction is low, the controlling means 5 can increase the feeding speed of the auxiliary feeding assembly 3 to the supplementary feeding hole 1231 corresponding to the position on the pole piece 8 where the local area density is low according to the detection result, so as to increase the amount of the slurry therein to increase the area density of the post-coating pole piece 8 therein, thereby realizing the closed-loop control of the area density of the pole piece 8.

Illustratively, when the detecting means 4 detects that the local areal density of the pole piece 8 after coating is high in the width direction, the control means 5 can decrease the speed at which the auxiliary feed assembly 3 feeds to the feed holes 1231 corresponding to the positions on the pole piece 8 where the local areal density is high, according to the detection result, thereby decreasing the amount of the slurry therein to decrease the areal density of the pole piece 8 after coating, thereby realizing closed-loop control of the areal density of the pole piece 8.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, a person skilled in the art can make equivalent changes or substitutions to the related technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims (10)

1. A coating apparatus for a pole piece, the coating apparatus comprising:

the coating component is provided with a feeding hole, a main material cavity, a uniform cavity and an extrusion hole which are sequentially communicated, and the uniform cavity is provided with a plurality of material supplementing holes which are distributed at intervals along the length direction of the uniform cavity;

the main feeding assembly is communicated with the feeding hole;

an auxiliary feed assembly in communication with the feed supplement hole;

a detecting member provided at a downstream end of the coating member, the detecting member being for detecting an areal density of the pole piece after being coated by the coating member; and

the control component is in communication connection with the detection component and the auxiliary feeding assembly and can adjust the feeding speed of the auxiliary feeding assembly towards each feeding hole according to the area density of the pole piece detected by the detection component.

2. The coating apparatus as claimed in claim 1, wherein the auxiliary supply assembly includes a plurality of supply channels and a supply member, the supply member is connected to the control member in communication, one end of each of the plurality of supply channels is connected to the corresponding feed hole, and the other end of each of the plurality of supply channels is connected to the supply member.

3. The coating apparatus of claim 2, wherein the coating member comprises an upper die and a lower die disposed opposite to each other and a shim disposed between the upper die and the lower die, the feed opening, the main material chamber, and the uniform chamber are all disposed on the lower die, and the extrusion opening is formed between the upper die and the lower die and at an edge of the upper die and the lower die.

4. A coating apparatus as in claim 3, wherein said feed holes are provided at the bottom of said uniformity chamber, and said feed runners are provided in said lower die and are disposed perpendicular to said uniformity chamber.

5. The coating apparatus as claimed in claim 2, wherein the supply member includes an auxiliary supply conduit, an auxiliary storage tank, an auxiliary supply pump, and an electrically controlled regulating valve disposed on the auxiliary supply conduit, the electrically controlled regulating valve is in communication with the control member, the number of the auxiliary supply conduits is plural, one end of each of the plurality of auxiliary supply conduits is in communication with the corresponding supply flow channel, and the other end of each of the plurality of auxiliary supply conduits is in communication with the auxiliary storage tank through the auxiliary supply pump.

6. A coating apparatus as claimed in claim 5, wherein said auxiliary feed pumps are at least two in number and each of said auxiliary feed pumps is in communication with at least two of said auxiliary feed conduits.

7. A coating apparatus as in claim 1, wherein the distance between said homogenizing chamber and said extrusion outlet is 15-35mm.

8. The coating apparatus of claim 1, wherein the width of the uniformity chamber is 10-25mm and the depth of the uniformity chamber is 40-100mm.

9. The coating apparatus as claimed in claim 1, wherein the distance between the supplementary material hole near the edge of the uniform chamber and the edge of the extrusion outlet is 5-35mm, and the distance between two adjacent supplementary material holes is 40-100mm.

10. A coating apparatus as claimed in any one of claims 1 to 9, wherein the main feed assembly comprises a main feed conduit, a main storage tank and a main feed pump, one end of the main feed conduit communicating with the feed inlet, the other end of the main feed conduit communicating with the main storage tank via the main feed pump.

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