CN219144219U - Electrode diaphragm processingequipment and pole piece processing equipment - Google Patents

Abstract

The utility model provides an electrode membrane processing device and electrode membrane processing equipment, wherein the electrode membrane processing device comprises a feeding unit, a conveying unit, a roll forming unit and a thinning unit; the conveying unit is provided with a conveying surface which is used for receiving and conveying materials; the rolling forming unit is arranged above the conveying surface and is provided with a belt pressing part or a plurality of press roller parts, and the belt pressing part or the press roller parts are respectively provided with a rolling surface for rolling the material on the conveying surface; the thinning unit is used for rolling the prefabricated electrode membrane into an electrode membrane with target thickness and conveying the electrode membrane. According to the electrode membrane processing device, materials can be rolled into the prefabricated electrode membrane through the press belt part or the plurality of press roller parts in the roll forming unit, and the prefabricated electrode membrane is rolled into the electrode membrane with the target thickness through the thinning unit, so that the processing efficiency of the electrode membrane is improved.

Description

Electrode diaphragm processingequipment and pole piece processing equipment

Technical Field

The utility model relates to the technical field of power batteries, in particular to an electrode diaphragm machining device. Meanwhile, the utility model also relates to pole piece processing equipment with the electrode membrane processing device.

Background

The traditional wet electrode technology has a bottleneck in energy density, so that the problems of pole piece cracking and the like can be caused by increasing the thickness of an electrode membrane. In addition, a large amount of energy and time are consumed for drying the battery pole piece, the production cost is increased, the production efficiency is reduced, in addition, the solvent NMP for manufacturing the positive pole piece is not friendly to the environment and is difficult to completely recycle, the residual NMP in the pole piece can affect the battery performance, and the dry electrode technology provides a new thought for solving the problems of mileage, charging rate, cost and the like.

As early as 2004, maxwell corporation succeeded in developing an active carbon dry electrode technology for supercapacitors. Nowadays, tesla also successfully utilizes a dry electrode technology to prepare a cylindrical battery, and the production cost of the battery can be reduced by more than 20% by adopting a brand-new dry electrode technology to replace the wet electrode technology, the electrode production occupied area is reduced by more than 60%, and the investment cost is reduced by more than 30%. However, the electrode membrane prepared by the traditional dry method has the problems of poor molding effect, easy belt breakage and the like because of unreasonable structural design of a molding unit and the like in a processing device, so that the popularization and the application of the electrode membrane prepared by the dry method are limited to a certain extent.

Disclosure of Invention

In view of the above, the present utility model is directed to an electrode membrane processing device, so as to improve continuous production of electrode membranes and have better production efficiency.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

an electrode membrane processing device comprises a feeding unit, a conveying unit, a roll forming unit and a thinning unit;

the conveying unit is provided with a conveying surface which is used for receiving and conveying the materials output by the feeding unit;

the rolling forming unit is arranged above the conveying surface and is provided with a pressing belt part or a plurality of pressing roller parts which are rotatably arranged, the pressing belt part or the pressing roller parts are respectively provided with a rolling surface for rolling the materials on the conveying surface, and the rolling surfaces roll the materials into prefabricated electrode films;

the thinning unit is arranged at the downstream of the conveying unit and is used for rolling the prefabricated electrode membrane into an electrode membrane with target thickness and conveying the electrode membrane.

Further, two first rotating rollers which are arranged at intervals and rotate are arranged above the conveying surface, and the belt pressing part is a rolling belt wound on the two first rotating rollers.

Further, the rolling belt is made of steel.

Further, the device also comprises a plurality of supporting rollers which are arranged above the rolling surface of the belt pressing part and below the conveying surface in a one-to-one correspondence manner; at least one of the supporting rollers is internally provided with a heating part.

Further, when the roll forming unit is provided with a plurality of press roller parts, the discharge end of the conveying unit is provided with a bearing plate, and the bearing plate is used for bearing the prefabricated electrode membrane between the conveying unit and the thinning unit.

Further, the press roll part comprises a coarse spreading roll, a fine spreading roll, a flat spreading roll and a squeeze roll which are rotationally arranged at intervals along the conveying direction of the materials;

a plurality of teeth are arranged on the rough spreading roller and the fine spreading roller in the circumferential direction, and the teeth on the rough spreading roller are sharper than the teeth on the fine spreading roller;

the distance between the spreading roller and the conveying surface is larger than the distance between the extruding roller and the conveying surface, and supporting rollers which are arranged in one-to-one correspondence with the spreading roller and the extruding roller are arranged below the conveying surface.

Further, the feeding unit adopts a vibration discharging device or a screw discharging device;

and/or the conveying unit comprises two second rotating rollers arranged at intervals and a conveying belt wound outside the two second rotating rollers.

Further, the thinning unit comprises a plurality of compression roller units which are arranged at intervals along the conveying direction of the prefabricated electrode membrane;

each press roller unit comprises press rollers which are rotatably arranged on the upper side and the lower side of the prefabricated electrode membrane, and the distance between the two press rollers in each press roller unit is gradually reduced along the conveying direction of the prefabricated electrode membrane; at least one of the press rolls is internally provided with a heating part.

Compared with the prior art, the utility model has the following advantages:

according to the electrode membrane processing device, materials can be rolled into the prefabricated electrode membrane through the press belt part or the plurality of press roller parts in the roll forming unit, and the prefabricated electrode membrane is rolled into the electrode membrane with the target thickness through the thinning unit, so that the processing efficiency of the electrode membrane is improved.

In addition, the belt pressing part adopts a structural mode of a rolling belt, and has the advantages of large rolling area and high rolling forming efficiency. The rolling belt made of steel has better structural strength and rolling reinforcement, and is beneficial to improving the continuity of the prefabricated electrode membrane. Through setting up the backing roll, do benefit to the roll-in effect that improves the material on the pressure area portion to the conveying face. The setting of bearing board does benefit to the transport effect that improves prefabricated electrode diaphragm by the delivery unit to attenuate unit, does benefit to the problem that avoids prefabricated electrode diaphragm to appear breaking the tape.

In addition, the coarse spreading roller, the fine spreading roller, the leveling roller and the extruding roller can be used for carrying out rolling forming on materials in a grading manner, and the forming effect of the prefabricated electrode membrane is improved. The vibration discharging device and the screw discharging device have good discharging effect and are convenient to arrange and implement. The conveying unit adopts the mode of second roller and conveyer belt, has simple structure, is convenient for implement, and carries advantage such as effectual. The plurality of press roller units are beneficial to rolling the prefabricated electrode membrane into the electrode membrane with the target thickness through the press rollers arranged up and down.

In addition, another object of the present utility model is to provide a pole piece processing apparatus, including an electrode membrane processing device as described above, a current collector unreeling device for unreeling a current collector, and a compound unit located downstream of the thinning unit and the current collector unreeling device;

the compounding unit is used for rolling the electrode membrane and the current collector, and compounding the electrode membrane on the current collector.

Further, the pole piece processing equipment further comprises a pole piece film unreeling device for unreeling the other electrode film, and the compounding unit is used for compounding the two electrode films on two sides of the current collector;

and/or the compound unit comprises compound rollers which are respectively and rotatably arranged on the upper side and the lower side of the electrode membrane and the current collector.

According to the pole piece processing equipment, the electrode membrane processing device, the current collector unreeling device and the compounding unit are arranged, so that the electrode membrane is favorably compounded on the current collector, and the production efficiency of the pole piece is improved.

In addition, through the current collector film unreeling device, two electrode films are combined on two sides of the current collector at the same time, so that the processing efficiency of the pole piece is further improved. The composite roller has simple structure and good composite effect on the electrode membrane and the current collector.

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. In the drawings:

FIG. 1 is a schematic view of an electrode membrane processing apparatus according to an embodiment of the utility model;

fig. 2 is a schematic structural diagram of an electrode membrane processing device according to a second embodiment of the utility model;

fig. 3 is a schematic structural diagram of a pole piece processing device according to a third embodiment of the present utility model;

fig. 4 is a schematic structural diagram of another pole piece processing device according to a third embodiment of the present utility model;

reference numerals illustrate:

1. a conveyor belt; 101. a second roller;

2. a screw discharging device; 201. a discharge channel; 202. a screw;

3. rolling the belt; 301. a first rotating roller;

4. a support roller; 5. a first press roller; 6. a second press roller; 7. an electrode membrane wind-up roll; 8. a composite roller; 9. a steering roller; 10. a current collector unreeling device; 11. a pole piece film unreeling device; 12. a vibration discharging device; 13. rough spreading rollers; 14. a fine spreading roller; 15. a spreading roller; 16. a squeeze roll; 17. a pole piece wind-up roll; 18. a bearing plate;

100. a current collector; 200. an electrode membrane; 300. prefabricating an electrode membrane.

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.

In the description of the present utility model, it should be noted that, if terms indicating an azimuth or a positional relationship such as "upper", "lower", "inner", "back", and the like are presented, they are based on the azimuth or the positional relationship shown in the drawings, only for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, if any, are also used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Example 1

The embodiment relates to an electrode membrane processing device, which comprises a feeding unit, a conveying unit, a roll forming unit and a thinning unit.

The conveying unit is provided with a conveying surface, and the conveying surface is used for receiving and conveying the materials output by the feeding unit. The roll forming unit is arranged above the conveying surface, and is provided with a roll belt part or a plurality of roll roller parts which are rotatably arranged, wherein the roll belt part or the roll roller parts are respectively provided with a roll surface for rolling the material on the conveying surface, and the roll surface rolls the material into the prefabricated electrode membrane 300. A thinning unit is provided downstream of the conveying unit for rolling and conveying the prefabricated electrode film 300 into the electrode film 200 of the target thickness.

As an exemplary structure, as shown in fig. 1, the conveying unit in the present embodiment includes two second rollers 101 provided at intervals and rotatably, and a conveying belt 1 wound around the outside of the two second rollers 101, wherein the conveying surface described above is an upper surface of an upper layer portion of the conveying belt 1. The feeding unit is located above the input end of the conveying surface for conveying the material onto the conveying surface, where the feeding unit may employ a screw discharging device 2 shown in fig. 1, which may employ a mature product in the prior art, the screw discharging device 2 having a feeding bin and a discharging channel 201 located at the bottom of the feeding bin, and the screw 202 being arranged in the discharging channel 201 to extrude the material in the feeding bin onto the conveying surface according to a target amount.

The material in this embodiment may be a positive electrode material for preparing a positive electrode membrane, and a negative electrode material for preparing a negative electrode membrane. Wherein, positive electrode active materials (such as NCM and LFP) or negative electrode active materials (such as GR) are respectively and uniformly mixed with conductive agents (such as SP, ECP, CNT, VGCF) and binders (such as PTFE, CMC, PVDF) according to a certain proportion, and the mixed materials are added from a feeding bin in a screw discharging device 2. The metering machine sends out signals by the controller, controls the stepping motor to drive the screw 202 to rotate, and materials continuously enter the conveying surface from the discharging channel 201 under the rotation acting force of the screw 202. The stepper motor is accurately regulated and controlled by the control system, so that the material quantity pushed by the rotation of the screw 202 is accurately controlled, and the metering range is as follows: 0.05-180kg/h.

Of course, the feeding unit in this embodiment may adopt the above-mentioned screw discharging device 2, and may also adopt the vibration discharging device 12 in the prior art to convey the material onto the conveying surface in a vibration discharging manner, so that the material has a better mixing effect at this time, and is beneficial to the processing and forming of the electrode membrane 200.

As shown in fig. 1, two first rollers 301 are provided above the conveying surface in this embodiment at intervals and rotatably provided, and the belt pressing portion is a roll belt 3 wound around the two first rollers 301. As a preferred embodiment, the rolling belt 3 and the conveying belt 1 are made of steel materials, so that the rolling area of materials is increased, and the prefabricated electrode membrane 300 which is formed by rolling the materials into sheets and continuously conveying the materials is also facilitated, so that a better forming effect is achieved.

In order to further improve the roll forming effect of the roll belt 3 and the conveyor belt 1 on the materials, the electrode membrane 200 processing device in this embodiment further includes a plurality of support rollers 4 rotatably disposed above the roll surface of the belt pressing portion and below the conveyor surface and disposed in one-to-one correspondence. As shown in fig. 1, the supporting rollers 4 are three pairs arranged at intervals along the conveying direction of the material, and each pair of supporting rollers 4 has two pairs arranged up and down, so that the rolling forming effect of the rolling surface on the rolling belt 3 and the conveying surface on the conveying belt 1 on the material is guaranteed, meanwhile, the supporting rollers 4 are simple in structure, convenient to arrange and implement and good in use effect.

As an exemplary structure, the belt width of the conveyor belt 1 in this embodiment is 350mm, and the gap between the conveying surface and the roller surface is 0 to 2mm, for example, 1mm. The diameters of the first and second rotating rollers 301 and 101 may be 350 to 450mm and the rotational speeds may be 2 to 10r/min. In addition, the supporting rollers 4 can perform the functions of heat conduction and providing area pressure, the diameter of the supporting rollers 4 can be 100-150 mm, for example, the diameter can be 120mm or 130mm, and in this embodiment, each supporting roller 4 is arranged in a heating part so as to heat the temperature of the supporting roller 4 to 200-250 ℃, and the maximum pressure of each supporting roller 4 can reach 10bar. Of course, in the specific implementation, the number of the support rollers 4 having the heating portions may be increased or decreased adaptively according to the use requirement.

In this embodiment, the running speeds of the conveying belt 1 and the rolling belt 3 are different, and there is a certain speed difference between the two, so that the adhesive in the material on the conveying surface is fibrillated to form a three-dimensional net structure under the action of friction force by the differential speed between the conveying belt 1 and the rolling belt 3, thereby facilitating the bonding of the active material and the conductive agent together, and further promoting the powder to form the prefabricated electrode membrane 300.

The thinning unit in this embodiment includes a plurality of press roller units arranged at intervals along the conveying direction of the prefabricated electrode film 300, each of which includes press rollers rotatably provided on the upper and lower sides of the prefabricated electrode film 300, and the distance between the two press rollers in each of which is set gradually smaller along the conveying direction of the prefabricated electrode film 300.

As shown in fig. 1, in the specific structure, two press roller units are provided in the present embodiment, wherein the press roller unit located upstream is referred to as a first press roller 5 unit, and the press roller unit located downstream is referred to as a second press roller 6 unit. Two first compression rollers 5 in the first compression roller 5 unit are respectively and vertically arranged on the upper side and the lower side of the electrode membrane 200 correspondingly, two second compression rollers 6 in the second compression roller 6 unit are respectively and vertically arranged on the upper side and the lower side of the electrode membrane 200 correspondingly, and the distance between the axes of the two first compression rollers 5 is larger than the distance between the axes of the two second compression rollers 6.

So set, it is beneficial to thin the prefabricated electrode membrane 300 twice until the thickness of the electrode membrane 200 reaches the target thickness. Of course, in the specific implementation, the number of the press roller units can be adaptively increased according to the use requirement, so long as the use requirement is met. Further, as shown in fig. 1, the electrode sheet 200 thinned by the thinning unit is wound by the electrode sheet winding roller 7 rotatably provided.

As an exemplary structure, the diameters of the first press roller 5 and the second press roller 6 in the present embodiment may be 400-450 mm, the distance between the two first press rollers 5 and the distance between the two second press rollers 6 may be 200-500 μm, and heating portions are also provided in the first press roller 5 and the second press roller 6 to heat the temperatures of the two to 150 ℃, in this embodiment, the temperatures of the first press roller 5 and the second press roller 6 may release the internal stress generated in the thinning process of the prefabricated electrode film 300. The thickness of the thinned electrode film 200 can be reduced to below 200 micrometers under the action of the first press roller 5 and the second press roller 6. Of course, a solution is also possible in which a heating part is provided in at least one of the press rolls.

According to the electrode membrane processing device, materials can be rolled into the prefabricated electrode membrane 300 through the belt pressing part in the rolling forming unit, and the prefabricated electrode membrane 300 is rolled into the electrode membrane 200 with the target thickness through the thinning unit, so that the processing efficiency of the electrode membrane 200 is improved. Meanwhile, the electrode membrane processing device is beneficial to improving the flexibility of the electrode membrane, and further beneficial to improving the yield.

Example two

The present embodiment relates to an electrode sheet processing apparatus having substantially the same structure as that of the first embodiment, except that a plurality of press roller portions are provided in the present embodiment, and that no press belt portion is provided in the first embodiment, and that the feeding unit employs the vibration discharging device 12 instead of the screw discharging device 2 in the first embodiment.

As shown in fig. 2, the press roll section in this embodiment includes a rough spreading roll 13, a fine spreading roll 14, a leveling roll 15, and a pressing roll 16 rotatably provided at intervals in the conveying direction of the material. Wherein, a plurality of teeth are arranged on the circumference of the rough spreading roller 13 and the fine spreading roller 14, and the teeth on the rough spreading roller 13 are sharper than the teeth on the fine spreading roller 14. The distance between the spreader roll 15 and the conveying surface is greater than the distance between the squeeze roll 16 and the conveying surface.

In this embodiment, the teeth on the rough spreading roller 13 and the fine spreading roller 14 are used to perform the first rolling forming and the second rolling forming on the material, so that the leveling roller 15 is beneficial to performing leveling forming on the material after the secondary rolling, and the squeeze roller 16 is beneficial to re-rolling the material primarily rolled by the leveling roller 15, so as to facilitate forming of the prefabricated electrode membrane 300.

In order to ensure the use effect of the leveling roller 15 and the squeeze roller 16, the support rollers 4 are provided rotatably below the conveying surface and vertically in correspondence with the leveling roller 15 and the squeeze roller 16. The support roller 4 is simple in structure, convenient to arrange and implement and good in use effect.

In this embodiment, the cross section of the tooth portion is triangular, the inner angle range of the outermost end of the triangle is 20 ° to 100 °, the rough spreading roller 13 in this embodiment can prevent slipping with the material, wherein the rough spreading roller 13 and the fine spreading roller 14 can play a role in promoting flattening of the material, and the fine spreading roller 14 plays a role in precisely distributing the powder. In this embodiment, the diameter of the spreader roll 15 and the squeeze roll 16 ranges from 100 mm to 150mm, where the spreader roll 15 functions to moderate and promote the activation of the binder, and the activated binder is capable of forming a three-dimensional network structure to bind the active material and the conductive agent together. In addition, the material is rolled for the first time by the spreading roller 15, the material which is not formed into a film after the first time rolling is rotated rightwards under the support of the conveying belt 1, and the prefabricated electrode membrane 300 with certain strength is formed under the action of the extrusion force and the shearing force of the extrusion roller 16.

In this embodiment, when the roll forming unit has a plurality of press roll portions, the discharge end of the conveying unit is provided with a supporting plate 18, and the supporting plate 18 is used for supporting the prefabricated electrode film 300 between the conveying unit and the thinning unit. As shown in fig. 2, the support plate 18 is extended from the discharge end of the conveyor belt 1 toward the first press roller 5 unit, and the support surface of the support plate 18 is larger than the width of the pre-electrode film 300 to ensure the support effect on the pre-electrode film 300.

According to the electrode membrane processing device, materials can be rolled into the prefabricated electrode membrane 300 through the plurality of pressing roller parts, and the prefabricated electrode membrane 300 is rolled into the electrode membrane 200 with the target thickness through the thinning unit, so that the processing efficiency of the electrode membrane 200 is improved.

Example III

The present embodiment relates to a pole piece processing apparatus including the electrode membrane processing device described in the first embodiment or the second embodiment, the current collector unreeling device 10 for unreeling the current collector 100, and a compound unit located downstream of the thinning unit and the current collector unreeling device 10. The lamination unit is used to roll the electrode tab 200 and the current collector 100 and laminate the electrode tab 200 to the current collector 100.

As shown in fig. 3, the electrode sheet processing apparatus employs the electrode sheet processing device described in embodiment one, at which time the current collector 100 unreeling device is located downstream of the second press roller 6 unit for unreeling the current collector 100. The electrode sheet processing apparatus further includes an electrode sheet film unreeling device 11 for unreeling the other electrode sheet 200, and a compounding unit for compounding the two electrode sheets 200 to both sides of the current collector 100. The electrode film unreeling device 11 is used for unreeling the electrode film 200, a steering roller 9 is rotationally arranged on a conveying path of the current collector 100, the electrode film 200 unreeled by the electrode film 200 unreeling device is attached to one side of the current collector 100 after passing through the steering roller 9, and the two electrode films 200 are positioned on two sides of the current collector 100, so that the two electrode films 200 can be simultaneously compounded on two surfaces of the current collector 100 after passing through a compounding unit, thereby being beneficial to improving the structural efficiency of the electrode film.

As a preferred embodiment, the compounding unit in this embodiment includes compounding rollers 8 rotatably disposed on both upper and lower sides of the electrode membrane 200 and the current collector 100, respectively, and the two electrode membranes 200 and the current collector 100 pass between the two compounding rollers 8, respectively, so as to be compounded together. The composite roller 8 is simple in structure, convenient to arrange and implement and high in composite efficiency. In addition, the pole piece after the compounding is wound by the pole piece winding roller 17 which is rotatably arranged. In this embodiment, under the pressure of the composite roller 8, the gaps between the active materials in the electrode membrane 200 are reduced to form a close-packed state, the density of the active materials per unit volume is increased, i.e., the energy density is high, and the thickness of the pole piece is uniform, so that the pole piece is finally obtained.

As another example, the pole piece processing apparatus in the present embodiment adopts an exemplary structure of the electrode film sheet processing device described in the second embodiment as shown in fig. 4, at this time, the above-described other pole piece film unreeling device 11 and the steering roller 9 may not be provided according to the use requirement, but only the pole piece unreeling device, the current collector 100 and the electrode film sheet 200 rolled to the target thickness by the thinning unit are simultaneously passed between the two compounding rollers 8, and compounded together.

The pole piece processing device according to the embodiment is beneficial to compounding the electrode membrane 200 on the current collector 100 by arranging the electrode membrane processing device, the pole piece unreeling device and the compounding unit, thereby improving the production efficiency of the pole piece.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (10)

1. An electrode diaphragm processingequipment, its characterized in that:

comprises a feeding unit, a conveying unit, a roll forming unit and a thinning unit;

the conveying unit is provided with a conveying surface which is used for receiving and conveying the materials output by the feeding unit;

the rolling forming unit is arranged above the conveying surface and is provided with a pressing belt part or a plurality of pressing roller parts which are rotatably arranged, the pressing belt part or the pressing roller parts are respectively provided with a rolling surface for rolling the materials on the conveying surface, and the rolling surfaces roll the materials into prefabricated electrode films;

the thinning unit is arranged at the downstream of the conveying unit and is used for rolling the prefabricated electrode membrane into an electrode membrane with target thickness and conveying the electrode membrane.

2. The electrode membrane processing apparatus according to claim 1, wherein:

the upper part of the conveying surface is provided with two first rotating rollers which are arranged at intervals in a rotating way, and the belt pressing part is a rolling belt wound on the two first rotating rollers.

3. The electrode membrane processing apparatus according to claim 2, wherein:

the rolling belt is made of steel.

4. The electrode membrane processing apparatus according to claim 1, wherein:

the supporting rollers are arranged above the rolling surface of the belt pressing part and below the conveying surface in a one-to-one correspondence manner;

at least one of the supporting rollers is internally provided with a heating part.

5. The electrode membrane processing apparatus according to claim 1, wherein:

when the roll forming unit is provided with a plurality of press roller parts, the discharge end of the conveying unit is provided with a bearing plate, and the bearing plate is used for bearing the prefabricated electrode membrane between the conveying unit and the thinning unit.

6. The electrode membrane processing apparatus according to claim 1, wherein:

the press roll part comprises a coarse spreading roll, a fine spreading roll, a leveling roll and a squeeze roll which are arranged at intervals along the conveying direction of the materials;

a plurality of teeth are arranged on the rough spreading roller and the fine spreading roller in the circumferential direction, and the teeth on the rough spreading roller are sharper than the teeth on the fine spreading roller;

the distance between the spreading roller and the conveying surface is larger than the distance between the extruding roller and the conveying surface, and supporting rollers which are arranged in one-to-one correspondence with the spreading roller and the extruding roller are arranged below the conveying surface.

7. The electrode membrane processing apparatus according to claim 1, wherein:

the feeding unit adopts a vibration discharging device or a screw discharging device;

and/or the conveying unit comprises two second rotating rollers arranged at intervals and a conveying belt wound outside the two second rotating rollers.

8. The electrode membrane processing apparatus according to claim 1, wherein:

the thinning unit comprises a plurality of compression roller units which are arranged at intervals along the conveying direction of the prefabricated electrode membrane;

each press roller unit comprises press rollers which are rotatably arranged on the upper side and the lower side of the prefabricated electrode membrane, and the distance between the two press rollers in each press roller unit is gradually reduced along the conveying direction of the prefabricated electrode membrane;

at least one of the press rolls is internally provided with a heating part.

9. The utility model provides a pole piece processing equipment which characterized in that: a current collector unreeling device comprising the electrode membrane processing device of any one of claims 1 to 8 for unreeling a current collector, and a compound unit downstream of the thinning unit and the current collector unreeling device;

the compounding unit is used for rolling the electrode membrane and the current collector, and compounding the electrode membrane on the current collector.

10. The pole piece processing apparatus of claim 9, wherein:

the pole piece processing equipment further comprises a pole piece film unreeling device for unreeling the other electrode film, and the compounding unit is used for compounding the two electrode films on two sides of the current collector;

and/or the compound unit comprises compound rollers which are respectively and rotatably arranged on the upper side and the lower side of the electrode membrane and the current collector.

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