CN221102130U - Pole piece manufacturing device - Google Patents

Abstract

The application relates to a pole piece manufacturing device. The pole piece manufacturing device comprises: the extrusion mechanism comprises a machine body, an extrusion piece and a stop piece, wherein the machine body is provided with a material conveying channel, the extrusion piece is arranged in the material conveying channel and is used for extruding bulk materials in the material conveying channel and outputting the bulk materials from an outlet of the material conveying channel to form a blank, and the stop piece is arranged on the machine body; the film forming mechanism is arranged at the downstream of the extrusion mechanism and comprises a plurality of press rolls, a rolling gap for a blank material to pass through is formed between every two adjacent press rolls, and every two adjacent press rolls are matched and used for rolling the blank material so as to thin and form the blank material into a film; wherein, at least one rolling gap is inserted with a stopper along at least one end in its length direction, and the length direction of the rolling gap intersects with the conveying direction of the blank. The pole piece manufacturing device provided by the application can solve the problem of higher manufacturing cost of the pole piece.

Description

Pole piece manufacturing device

Technical Field

The application relates to the technical field of batteries, in particular to a pole piece manufacturing device.

Background

Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles.

The battery includes an electrode assembly, which is a component in the battery in which an electrochemical reaction occurs. The electrode assembly is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate. At present, raw materials are wasted greatly in the process of manufacturing the pole piece, so that the manufacturing cost of the pole piece is high.

Disclosure of utility model

In view of the foregoing, the present application provides a pole piece manufacturing apparatus, which aims to improve the problem of higher manufacturing cost of pole pieces in the related art.

A pole piece manufacturing apparatus comprising:

The extrusion mechanism comprises a machine body, an extrusion piece and a stop piece, wherein the machine body is provided with a material conveying channel, the extrusion piece is arranged in the material conveying channel and is used for extruding bulk materials in the material conveying channel and outputting the bulk materials from an outlet of the material conveying channel to form a blank, and the stop piece is arranged on the machine body;

The film forming mechanism is arranged at the downstream of the extrusion mechanism and comprises a plurality of press rolls, a rolling gap for a blank material to pass through is formed between every two adjacent press rolls, and every two adjacent press rolls are matched and used for rolling the blank material so as to thin and form the blank material into a film;

Wherein, at least one rolling gap is inserted with a stopper along at least one end in its length direction, and the length direction of the rolling gap intersects with the conveying direction of the blank.

In such pole piece manufacturing installation, this pole piece manufacturing installation passes through the at least one end of stopper shutoff roll-in clearance along its length direction, then when blank material extrusion roll-in and along the length direction in roll-in clearance in-process that extends, blank and stopper butt time, blank material no longer extends for the edge of the diaphragm of final formation is comparatively neat. Therefore, the formed diaphragm has smaller probability of needing trimming, reduces the generation of waste materials in the pole piece production process, reduces the waste of raw materials and reduces the manufacturing cost of the pole piece.

In some embodiments, at least one rolling gap is inserted with stops along opposite ends of its length.

The two sides of the blank are stopped by the stop piece, so that the edges of the two sides of the finally formed diaphragm are all more neat, the possibility of trimming is further reduced, and the effect of reducing raw material waste is realized.

In some embodiments, a stop is inserted at both ends of the first roll gap, which is arranged in the conveying direction of the blank.

Since the shape of the blank is most varied when the blank passes through the first roll nip provided in the conveying direction of the blank itself, the edges of the blank are more likely to be uneven when the blank is stretched in the first roll nip. Under this kind of circumstances, through all having inserted the backstop piece at the both ends of the first roll-in clearance that sets up along the direction of delivery of blank for the both sides edge of the diaphragm that forms is comparatively neat all, has reduced the excision of rim charge, and the raw materials is extravagant to be reduced. When the film sheet subsequently passes through the other rolling gaps except the first rolling gap, the edge of the film sheet can be maintained in a relatively flat state because the degree of thinning is not too great each time.

In some embodiments, the stopper is an elastic member that seals with the roll surface of the roll forming the roll gap that is inserted into itself.

By enabling the stop piece to be tightly adhered to the rolling surface of the pressing roller forming the self-inserted rolling gap, the difficulty of extruding the blank material through the gap between the stop piece and the pressing roller is high in the process of passing through the rolling gap, and therefore the flatness of the edge of the diaphragm is improved.

In some embodiments, the stop is removably connected with the body.

Through designing stopper and organism detachably to be connected, when stopper wearing and tearing lead to there is the clearance between stopper and the compression roller, conveniently change the stopper, be favorable to promoting the reliability of backstop.

In some embodiments, the extrusion mechanism is a twin screw extrusion mechanism.

The double-screw extrusion mechanism has strong pressure building capability, can burst the hollow in the bulk material and drive the material to enter the space occupied by the hollow, thereby obtaining blank material with consistent uniformity, and the thinned and formed membrane has good transverse uniformity, and is beneficial to controlling the thickness and uniformity of the formed membrane.

In some embodiments, the device further comprises a pressure detecting piece, the pressure detecting piece is arranged on the machine body, the detecting end of the pressure detecting piece stretches into the material conveying channel and is located on the conveying path of the bulk material, the pressure detecting piece is used for detecting extrusion force suffered by the bulk material, and the extrusion piece is configured to adjust extrusion force applied to the bulk material to be within a preset pressure range when the extrusion force exceeds the preset pressure range.

The pressure detection piece is arranged, so that the extrusion force can be automatically adjusted, and the thickness and uniformity of the formed diaphragm can be controlled.

In some embodiments, a kneading mechanism is also included, upstream of the extrusion mechanism, and is used to knead the material and slurry into a dough.

The materials and the slurry are extruded and molded into the bulk materials through the kneading mechanism, and the materials and the slurry can be uniformly mixed.

In some embodiments, a compounding mechanism is also included, disposed downstream of the film forming mechanism, and configured to compound the membrane sheet with the substrate to form the pole piece.

In the application, the membrane and the base material can be compounded into the pole piece by arranging the compounding mechanism.

In some embodiments, the pole piece drying device further comprises a drying mechanism arranged at the downstream of the compound mechanism, and the drying mechanism is used for drying the pole piece.

The pole piece is dried by the drying mechanism, so that moisture of the pole piece is evaporated quickly, the pole piece is dried and shaped, and the performance of the pole piece is guaranteed. In addition, the pole piece manufactured by the pole piece manufacturing device can be conveyed through the roller, and the winding type and folding type structure baking oven can be adopted, so that the length of the baking oven is shortened, the occupied area of equipment is reduced, and the production cost is reduced.

In some embodiments, a winding mechanism is further included, disposed downstream of the compounding mechanism, and configured to wind the pole piece.

Through setting up winding mechanism, can roll up the pole piece fast, conveniently store the transportation to the pole piece.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

Fig. 1 is a schematic structural diagram of a pole piece manufacturing apparatus according to some embodiments of the present application.

Fig. 2 is a schematic structural diagram of the body and the stopper according to some embodiments of the present application.

Fig. 3 is a schematic view of the configuration of the extrusion mechanism in cooperation with the film forming mechanism and the pressure detecting member according to some embodiments of the present application.

Reference numerals:

1. A pole piece manufacturing device; 10. a kneading mechanism; 20. an extrusion mechanism; 21. a body; 211. a material conveying channel; 22. an extrusion; 221. an extrusion part; 23. a stopper; 30. a film forming mechanism; 31. a press roller; 32. a first press roller; 33. a second press roller; 34. rolling the gap; 40. a compound mechanism; 41. a composite roller; 42. compounding the gap; 50. a pressure detecting member; 60. a material conveying mechanism; 70. a slurry conveying mechanism; 80. a substrate unreeling roller; 90. a winding mechanism; 110. a drying mechanism; 120. passing through a roller; 2. a dough material; 3. blank material; 4. a membrane; 5. a substrate; 6. pole pieces.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Currently, the more widely the battery is used in view of the development of market situation. The battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and the like, as well as a plurality of fields such as military equipment, aerospace, and the like. With the continuous expansion of the battery application field, the market demand thereof is also continuously expanding.

The battery includes an electrode assembly, which is a component in the battery in which an electrochemical reaction occurs. The electrode assembly is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate. At present, raw materials are wasted greatly in the process of manufacturing the pole piece, so that the manufacturing cost of the pole piece is high.

Through careful study, one of the reasons for the high manufacturing cost of the pole piece is that: the pole piece is manufactured by feeding active material blank material to the surface of a roller to roll the blank material into a membrane. However, during the process of pressing the blank material through the rollers and forming the film sheet, the blank material may extend along the length direction of the rolling gap, and finally the edge of the film sheet may be uneven and need to be trimmed. The scrap cannot be reused after trimming, so that the raw materials of the pole piece are wasted greatly, and the manufacturing cost of the pole piece is high.

In view of this, an embodiment of the present application provides a pole piece manufacturing apparatus including an extrusion mechanism for extruding a dough and outputting the dough from an outlet of a feed passage to form a blank, and a film forming mechanism for thinning and forming the blank passing through a rolling gap into a film sheet, at least one of which is inserted with a stopper along at least one end in a length direction thereof.

According to the pole piece manufacturing device, the stop piece is inserted into at least one end of at least one rolling gap along the length direction of the rolling gap, and when the blank material is extruded through the roller and extends along the length direction of the rolling gap, the blank material does not extend any more when the blank material is abutted against the stop piece, so that the edge of the finally formed diaphragm is more neat. Therefore, the probability that the edge of the abutting part of the diaphragm and the stop piece needs to be cut is small, the generation of waste materials in the pole piece production process is reduced, the waste of raw materials is reduced, and the manufacturing cost of the pole piece is reduced.

Referring to fig. 1, fig. 2 and fig. 3 together, fig. 1 is a schematic structural diagram of a pole piece manufacturing device 1 according to some embodiments of the present application, fig. 2 is a schematic structural diagram of a machine body 21 and a stop member 23 in accordance with some embodiments of the present application, and fig. 3 is a schematic structural diagram of an extrusion mechanism 20, a film forming mechanism 30 and a pressure detecting member 50 in accordance with some embodiments of the present application.

The technical scheme described in the embodiment of the application is suitable for manufacturing the pole piece 6.

The embodiment of the application provides a pole piece manufacturing device 1, wherein the pole piece manufacturing device 1 comprises an extrusion mechanism 20 and a film forming mechanism 30. The extruding mechanism 20 includes a body 21, an extruding member 22, and a stopper 23. The body 21 has a feed passage 211, the pressing member 22 is disposed in the feed passage 211, and is used to press the dough 2 in the feed passage 211 and output from the outlet of the feed passage 211 to form a blank 3, and the stopper 23 is disposed on the body 21. The film forming mechanism 30 is provided downstream of the extrusion mechanism 20, and includes a plurality of press rollers 31, a roll gap 34 through which the blank 3 passes is formed between each adjacent two of the press rollers 31, and each adjacent two of the press rollers 31 is fitted for rolling the blank 3 to thin-form the blank 3 into the film sheet 4. Wherein at least one rolling gap 34 is inserted with a stopper 23 along at least one end in its length direction, the length direction of the rolling gap 34 intersecting with the conveying direction of the blank 3.

The dough 2 is a product obtained by extrusion molding of a material and slurry by a kneading mechanism 10. The dough 2 extruded by the kneading mechanism 10 may be continuous, and one section thereof is selected to be removed, so that the dough is of a dough structure. The dough 2 has a certain strength and flexibility, and its cross-sectional dimensions are much larger than those of the blank 3.

The materials include positive electrode active material/negative electrode active material, conductive agent, positive electrode solid binder/negative electrode solid binder, etc.

The positive electrode active material may include at least one of the following materials: olivine structured lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material may be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of the olivine structured lithium-containing phosphate may include, but are not limited to, lithium iron phosphate (e.g., liFePO ₄ (also may be abbreviated as LFP)), a composite of lithium iron phosphate and carbon, a composite of lithium manganese phosphate and manganese iron phosphate, and at least one of lithium iron phosphate and carbon.

The anode active material may include at least one of a carbon material, a silicon material, lithium, a lithium alloy material, wherein the carbon material may include natural graphite, artificial graphite, mesophase carbon microspheres, hard carbon, soft carbon, etc., and the silicon material may include silicon oxide, silicon nanowires, composite silicon carbon material, etc.; the lithium and lithium alloy material may include at least one of titanium oxide, lithium alloy, and materials capable of forming lithium alloy.

The conductive agent may include at least one of superconducting carbon, acetylene black, carbon black, ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

The positive electrode solid binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, and fluoroacrylate resin, or a fluorine-free positive electrode binder may be used.

The negative electrode solid binder may comprise one of acrylonitrile, acrylic acid, polyamide or one of acrylonitrile-acrylic acid, acrylonitrile-polyamide, acrylic acid-polyamide copolymer or acrylonitrile-acrylic acid-polyamide copolymer.

The slurry may include a liquid binder. The slurry may include small molecule alcohols such as one or more of 1, 4-butanediol, 1, 3-butanediol, 2, 3-butanediol, 1, 2-propanediol, 1, 3-hexanediol; the slurry may also include esters such as one or more of triethyl phosphate, ethylene carbonate, dimethyl carbonate, diethyl carbonate, propylene carbonate, valerolactone, ethyl acetate, propyl acetate, butyl acetate, methyl butyrate; one or more of dioxane, N-methylpyrrolidone, acetone, butanone, N-dimethylacetamide and dimethyl sulfoxide can also be selected.

The dough 3 is a product obtained by extrusion molding of the dough 2 by the extrusion mechanism 20. The blank 3 has thicker thickness, self-supporting capability and difficult fracture. The thickness of the blank 3 is generally 1 to 10mm.

The extrusion mechanism 20 is a mechanism capable of performing an extrusion molding process. The extrusion mechanism 20 can be used for extrusion molding of the bulk material 2 into the blank material 3 so as to be convenient for extruding and breaking the hollow holes in the bulk material and driving the material into the space occupied by the hollow holes, thereby obtaining the blank material 3 with uniform uniformity. Extrusion mechanism 20 includes, but is not limited to, a ram extrusion mechanism 20, a twin screw extrusion mechanism 20, a single screw extrusion mechanism 20, and the like.

The feeding channel 211 in the body 21 may be one or more, and the inlet of the feeding channel 211 is directed to the kneading mechanism 10 and is used for receiving the dough 2 extruded by the kneading mechanism 10. Taking the feeding channels 211 as an example, all the feeding channels 211 are arranged side by side along the length direction of the rolling gap 34 or in a direction parallel to the length direction of the rolling gap 34. The multiple material conveying channels 211 can be mutually independent, or each material conveying channel 211 can also comprise a feeding section and a discharging section, the feeding sections of each material conveying channel 211 are sequentially communicated along the arrangement direction of the material conveying channels 211 and form a cavity for receiving the bulk material 2, and the discharging sections of each material conveying channel 211 are independently arranged and are used for outputting the blank 3.

The extrusion pieces 22 are equal in number and in one-to-one correspondence with the material conveying channels 211, and each extrusion piece 22 is disposed in a corresponding material conveying channel 211 and is used for extruding the dough 2 and is output from an outlet of the corresponding material conveying channel 211.

The stopper 23 may be rod-shaped, block-shaped, or otherwise. Illustratively, the stoppers 23 are provided on the machine body 21, and in the conveying direction of the blank 3, the cross-sectional area of the stoppers 23 is gradually reduced to facilitate insertion of the stoppers 23 into the corresponding rolling gaps 34.

The film forming mechanism 30 is a mechanism capable of thinning and forming the blank 3 into the film 4. Since the blank 3 is thick and cannot be directly combined with the base material 5, the blank 3 is thinned by the film forming mechanism 30 to produce the film 4. The film 4 thinned and formed by the film forming mechanism 30 has better uniformity of active substances and more uniform thickness, and is beneficial to improving the quality of the pole piece 6.

The film forming mechanism 30 may include two press rollers 31, three press rollers 31, four press rollers 31, or four or more press rollers 31. Referring to fig. 1, the film forming mechanism 30 in fig. 1 includes two press rollers 31. The blank 3 can be gradually thinned and formed into the membrane 4 by the plurality of compression rollers 31, the thinning degree of each time is not too large, and the uniformity and thickness consistency of the membrane 4 are improved. The length direction of the roll gap 34 is arranged in parallel with the axial direction of the press roll 31 forming the roll gap 34.

By "a roll nip 34 is formed between each adjacent two of the press rolls 31 through which the blank 3 passes" is meant that each adjacent two of the press rolls 31 cooperate with the roll film sheet 4 to reduce the thickness of the blank 3 to be equal to the width of the roll nip 34. The width of the roll gap 34 refers to the dimension of the roll gap 34 in the direction in which the two rolls 31 forming the roll gap 34 are arranged at intervals.

In the related art, during the process of pressing the blank 3 through the roller 120 and forming the film sheet 4, the blank may extend along the length direction of the roll gap 34, and the roll gap 34 is not blocked along the length direction thereof, which may easily cause uneven edges of the film sheet 4 along the width direction thereof, and thus may require trimming. The scrap cannot be reused after trimming, so that the raw material waste of the pole piece 6 is large, and the manufacturing cost of the pole piece 6 is high. The width direction of the film 4 corresponds to the length direction of the roll gap 34.

According to the pole piece manufacturing device 1, at least one end of the rolling gap 34 in the length direction is plugged through the stop piece 23, when the blank 3 is extruded through the roller 120 and extends in the length direction of the rolling gap 34, the blank 3 does not extend any more when the blank 3 is abutted against the stop piece 23, and the edge of the finally formed membrane 4 is more neat. Therefore, the formed membrane 4 has smaller probability of needing trimming, reduces the generation of waste materials in the production process of the pole piece 6, reduces the waste of raw materials and reduces the manufacturing cost of the pole piece 6.

It should be noted that, in order to improve the flatness of the edge of the film 4, the surface of the stopper 23 that stops the blank 3 should be set to be flat and also parallel to the conveying direction of the blank 3.

In addition, this pole piece manufacturing device 1 is with bulk material 2 extrusion molding into blank material 3 through extrusion mechanism 20, compares directly with material and thick liquids extrusion molding into blank material 3, and material and thick liquids extrusion molding are bulk material 2 through kneading mechanism 10 earlier, and then extrude bulk material 2 into blank material 3, and on the one hand the mixture of material and thick liquids can be more even. On the other hand, the extrusion resistance is relatively small, the extrusion speed is high, and the mass of the extruded raw material 3 is higher. The pole piece manufacturing device 1 is adopted to manufacture the pole piece 6, the uniformity of an active material layer is good, the performance of the pole piece 6 is excellent, and the manufacturing efficiency is high.

In some embodiments, at least one rolling gap 34 is inserted with stops 23 along opposite ends of its length.

That is, the stoppers 23 stop the blank 3 on both sides in the width direction of the blank 3.

The two sides of the blank 3 are stopped by the stop piece 23, so that the edges of the two sides of the finally formed diaphragm 4 are all more neat, the possibility of trimming is further reduced, and the effect of reducing raw material waste is realized.

Of course, in some embodiments, in order to avoid the occurrence of uneven edges of the membrane 4 caused by the failure of the stopper 23, a trimming mechanism may be provided in the pole piece manufacturing device 1, and the trimming mechanism is used to cut off the edges of the membrane 4 so as to trim the membrane 4.

In some embodiments, the stops 23 are inserted at both ends of the first roll gap 34 arranged in the conveying direction of the blank 3.

For example, taking the pole piece manufacturing device 1 as an example, the pole piece manufacturing device includes three press rolls 31, along the conveying direction of the blank 3, the three press rolls 31 are a first press roll 3231, a second press roll 3331 and a third press roll 31 in sequence, a first roll gap 34 is defined between the first press roll 3231 and the second press roll 3331, a second roll gap 34 is defined between the second press roll 3331 and the third press roll 31, and the blank 3 sequentially passes through the first roll gap 34 and the second roll gap 34. The first rolling gap 34 along the conveying direction of the blank 3 is the rolling gap 34 defined by the first pressing roller 3231 and the second pressing roller 3331.

Since the shape of the blank 3 is most varied when the blank 3 passes through the first roll nip 34 provided in the conveying direction thereof, the edges of the blank 3 are more likely to be uneven when the blank 3 is stretched in the first roll nip 34. In this case, the stoppers 23 are inserted into both ends of the first rolling gap 34 provided along the conveying direction of the blank 3, so that both side edges of the formed film 4 are more regular, cutting of the edge stock is reduced, and waste of raw materials is reduced. Since the degree of each thinning is not so great when the film 4 subsequently passes through the other roll gaps 34 than the first roll gap 34, the edge of the film 4 can be maintained in a relatively flat state.

In some embodiments, the stopper 23 is an elastic member, and the stopper 23 is in close contact with the roll surface of the roll 31 forming the roll gap 34 inserted into itself. Specifically, the surfaces of the stoppers 23 facing the press roller 31 are all arc surfaces, and can be attached to the press roller 31 to achieve the sealing between the stoppers 23 and the press roller 31.

By bringing the stopper 23 into close contact with the roll surface of the roll 31 forming the roll gap 34 inserted into itself, difficulty in extrusion from the gap between the stopper 23 and the roll 31 is greater in the process of pressing the blank 3 through the roll 120, and thus the flatness of the edge of the film 4 is improved.

In some embodiments of the present application, the stopper 23 is detachably connected with the body 21.

For example, the detachable connection mode can be a screw connection, a clamping connection mode and the like.

Since the stopper 23 is in close contact with the press roller 31, the stopper 23 is worn continuously during the rotation of the press roller 31 and the rolling of the blank 3, resulting in the need for periodic replacement of the stopper 23.

Through designing stopper 23 and organism 21 detachably to be connected, when the stopper 23 wearing and tearing lead to there is the clearance between stopper 23 and the compression roller 31, conveniently change stopper 23, be favorable to promoting the reliability of backstop.

In some embodiments of the application, the extrusion mechanism 20 is a twin screw extrusion mechanism 20.

In this embodiment, there are two material feeding passages 211 and two pressing members 22, and the two pressing members 22 are respectively located in the corresponding material feeding passages 211. The pressing members 22 include screws, and the screws of the pressing members 22 are used to press the dough 2 in the corresponding feed passage 211 and are output from the outlet of the feed passage 211.

The double-screw extrusion mechanism 20 has strong pressure build-up capability, can burst the hollow in the bulk material and drive the material to enter the space occupied by the hollow, thereby obtaining a blank material 3 with consistent uniformity, and the thinned and formed membrane 4 has good transverse uniformity, which is beneficial to controlling the thickness and uniformity of the formed membrane 4.

In some embodiments of the present application, the pole piece manufacturing device 1 further includes a pressure detecting member 50, the pressure detecting member 50 is disposed on the machine body 21, and a detecting end of the pressure detecting member 50 extends into the material conveying channel and is located on the conveying path of the dough material 2, the pressure detecting member 50 is used for detecting the extrusion force applied to the dough material 2, and the extrusion member 22 is configured to adjust the extrusion force applied to the dough material 2 to a preset pressure range when the extrusion force exceeds the preset pressure range.

The conveyance path of the dough 2 is a path through which the dough 2 forms the blanks 3.

The extrusion 22 comprises a driving part and an extrusion part 221, wherein the driving part is in transmission connection with the extrusion part 221 and is used for driving the extrusion part 221 to extrude the dough 2. Taking the extrusion mechanism 20 as an example of the twin screw extrusion mechanism 20, the driving part is a motor, and the extrusion part 221 is a screw.

The pole piece manufacturing device 1 further comprises a controller electrically connected between the driving part and the pressure detecting member 50. When the extrusion force applied to the dough 2 detected by the pressure detecting member 50 exceeds the preset pressure range, the controller gives an instruction to the driving part to adjust the output power of the driving part, so that the extrusion force applied to the dough 2 by the extrusion part 221 is adjusted to be within the preset pressure range. When the extrusion force is in a preset pressure range, the speed of the bulk material 2 passing through the material conveying channel is proper, and the thickness of the membrane 4 extruded by the rolling mechanism is proper and the uniformity is good.

The number of the pressure detecting pieces 50 and the extruding pieces 22 is the same as the number of the material conveying channels 211 and is uniform and corresponding to the number of the material conveying channels, the detecting ends of the pressure detecting pieces 50 are positioned on the conveying paths of the bulk materials 2 in the corresponding material conveying channels, and the driving parts of the extruding pieces 22 are electrically connected with the controller.

The pressure detecting member 50 is provided to realize automatic adjustment of the pressing force, thereby facilitating control of thickness and uniformity of the molded membrane 4.

In some embodiments of the application, the pole piece manufacturing device 1 further comprises a kneading mechanism 10, the kneading mechanism 10 being located upstream of the extrusion mechanism 20 and being used for kneading the material and the slurry into a dough 2.

The kneading mechanism 10 is a mechanism capable of performing an extrusion molding process. The kneading mechanism 10 can be used to extrude the material and the slurry into a dough 2 so as to uniformly mix the material and the slurry. Kneading mechanism 10 includes, but is not limited to, a ram extrusion mechanism 20, a twin screw extrusion mechanism 20, a single screw extrusion mechanism 20, a kneader, and the like.

The materials and the slurry are extruded and molded into the bulk material 2 through the kneading mechanism 10, and the materials and the slurry can be uniformly mixed.

In some embodiments of the present application, the pole piece manufacturing device 1 further comprises a compounding mechanism 40, the compounding mechanism 40 being disposed downstream of the film forming mechanism 30 and being used to compound the membrane 4 with the substrate 5 to form the pole piece 6.

The compounding mechanism 40 is a mechanism that compounds the membrane 4 and the base material 5 into the pole piece 6. From the perspective of the pole piece 6, the membrane 4 is the active material layer of the pole piece 6, and the substrate 5 is the current collector of the pole piece 6. The substrate 5 may be a metal foil or a composite current collector. For example, as the metal foil, copper foil may be used as the base material 5 of the negative electrode tab 6, and aluminum foil may be used as the base material 5 of the positive electrode tab 6. The composite current collector may include a polymeric material base layer and a metal layer formed on at least one surface of the polymeric material base layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel alloy, titanium alloy, silver alloy, etc.) on a polymer material base layer (e.g., a base layer of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).

The compounding mechanism 40 may be located on one side of the substrate 5 and compound the membrane 4 to one side of the substrate 5; alternatively, the compounding mechanism 40 may be located on both sides of the substrate 5, and compound the membrane 4 on both sides of the substrate 5.

In this embodiment, the pole piece manufacturing apparatus 1 further includes a substrate unreeling roller 80, and the substrate unreeling roller 80 is used for unreeling the substrate 5.

In some embodiments, the compounding mechanism 40 includes two compounding rollers 41, with a compounding gap 42 formed between the two compounding rollers 41 through which the film sheet 4 and the substrate 5 pass. The composite roll 41 is a roll structure for compounding the film sheet 4 with the base material 5. Of course, in other embodiments, the compounding mechanism 40 may include a plurality of compounding rollers 41, the plurality of compounding rollers 41 cooperating to roll the film sheet 4 and the substrate 5 to compound the film sheet 4 and the substrate 5.

In the conveying direction of the blank 3, a roll gap 34 for rolling the film web 4 is also formed between the last press roll 31 of the film forming mechanism 30 and the adjacent composite roll 41.

In the present application, the membrane 4 and the base material 5 can be combined into the pole piece 6 by providing the combining mechanism 40.

In some embodiments of the present application, the pole piece manufacturing device 1 further comprises a drying mechanism 110, the drying mechanism 110 being disposed downstream of the compounding mechanism 40, the drying mechanism 110 being configured to dry the pole piece 6.

Drying the pole piece 6 by the drying mechanism 110 is beneficial to quickly evaporating the moisture of the pole piece 6, so that the pole piece 6 is dried and shaped, and the performance of the pole piece 6 is ensured. In addition, the pole piece 6 manufactured by the pole piece manufacturing device 1 can be conveyed through the roller 120, and a winding type and folding type structure oven can be adopted, so that the length of the oven is shortened, the occupied area of equipment is reduced, and the production cost is reduced.

In some embodiments of the present application, the pole piece manufacturing device 1 further comprises a winding mechanism 90, and the winding mechanism 90 is disposed downstream of the compounding mechanism 40 and is used for winding the pole piece 6.

The winding mechanism 90 comprises a winding roller, the pole piece 6 is wound on the winding roller, and winding is completed on the winding roller.

Through setting up winding mechanism 90, can roll up pole piece 6 fast, conveniently store pole piece 6 and transport.

In some embodiments, the pole piece manufacturing device 1 further comprises a premixing mechanism disposed upstream of the kneading mechanism 10 for premixing the materials.

The premixing means is a means for premixing a positive electrode active material/negative electrode active material, a conductive agent, a positive electrode solid binder/negative electrode solid binder, and the like. Optionally, the premixing mechanism is a premixing tank.

The premixing mechanism is arranged to premix materials, so that the materials have better uniformity before entering the kneading mechanism 10, the uniformity of the materials after extrusion molding through the kneading mechanism 10 and the extrusion mechanism 20 can be better, the quality of the molded membrane 4 is better, and the performance of the pole piece 6 is improved.

In some embodiments, the pole piece manufacturing device 1 includes a material conveying mechanism 60 and a slurry conveying mechanism 70, the material conveying mechanism 60 being used to convey material into the kneading mechanism 10, and the slurry conveying mechanism 70 being used to convey slurry into the kneading mechanism 10.

In some embodiments, the pole piece manufacturing device 1 includes two film forming mechanisms 30, two kneading mechanisms 10, two extrusion mechanisms 20, and the two film forming mechanisms 30 are in one-to-one correspondence with the two kneading mechanisms 10 and the two extrusion mechanisms 20. The compounding mechanism 40 is used for compounding the membrane sheets 4 molded by the two membrane molding mechanisms 30 on both sides of the base material 5 to form the pole pieces 6.

By providing the two kneading mechanisms 10, the two extrusion mechanisms 20, and the two film forming mechanisms 30, it is possible to simultaneously produce two films 4, and the compounding mechanism 40 composites the two films 4 on both sides of the base material 5, thereby producing the pole pieces 6 having active material layers on both sides of the base material 5 at a time.

According to some embodiments of the present application, there is provided a pole piece manufacturing apparatus 1, the pole piece manufacturing apparatus 1 including an extrusion mechanism 20 and a film forming mechanism 30, the extrusion mechanism 20 including a body 21, an extrusion member 22 and a stopper 23, the body 21 having a material conveying passage 211, the extrusion member 22 being disposed in the material conveying passage 211 and being used for extruding a dough 2 in the material conveying passage 211 and being output from an outlet of the material conveying passage 211 to form a blank 3, the stopper 23 being disposed on the body 21. The film forming mechanism 30 is arranged at the downstream of the extrusion mechanism 20 and comprises a plurality of press rollers 31, a rolling gap 34 for the blank 3 to pass through is formed between every two adjacent press rollers 31, and every two adjacent press rollers 31 are matched and used for rolling the blank 3 so as to thin and form the blank 3 into a film sheet 4; wherein at least one rolling gap 34 is inserted with a stopper 23 along at least one end in its length direction, the length direction of the rolling gap 34 intersecting with the conveying direction of the blank 3.

In such a pole piece manufacturing device 1, the pole piece manufacturing device 1 seals at least one end of the rolling gap 34 along the length direction thereof through the stop piece 23, and when the blank 3 is pressed against the roller 120 and extends along the length direction of the rolling gap 34, the blank 3 does not extend any more when the blank 3 abuts against the stop piece 23, so that the edge of the finally formed film 4 is more neat. Therefore, the formed membrane 4 has smaller probability of needing trimming, reduces the generation of waste materials in the production process of the pole piece 6, reduces the waste of raw materials and reduces the manufacturing cost of the pole piece 6.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (11)

1. A pole piece manufacturing apparatus, comprising:

The extrusion mechanism (20) comprises a machine body (21), an extrusion piece (22) and a stop piece (23), wherein the machine body (21) is provided with a material conveying channel (211), the extrusion piece (22) is arranged in the material conveying channel (211) and is used for extruding a bulk material (2) in the material conveying channel (211) and outputting the bulk material from an outlet of the material conveying channel (211) so as to form a blank (3), and the stop piece (23) is arranged on the machine body (21);

The film forming mechanism (30) is arranged at the downstream of the extruding mechanism (20) and comprises a plurality of press rollers (31), a rolling gap (34) for a blank material (3) to pass through is formed between every two adjacent press rollers (31), and every two adjacent press rollers (31) are matched and used for rolling the blank material (3) so as to thin and form the blank material (3) into a film sheet (4);

Wherein, at least one rolling gap (34) is inserted with a stop piece (23) along at least one end of the length direction, and the length direction of the rolling gap (34) is intersected with the conveying direction of the blank material (3).

2. A pole piece manufacturing device according to claim 1, characterized in that at least one of the roll gaps (34) is inserted with the stop members (23) at opposite ends along its length.

3. A pole piece manufacturing device according to claim 1, characterized in that a stop (23) is inserted at both ends of a first one of the roll gaps (34) arranged in the conveying direction of the blank (3).

4. A pole piece manufacturing device according to claim 1, characterized in that the stopper (23) is an elastic member, the stopper (23) being in close contact with the roll surface of the roll (31) forming the roll gap (34) inserted into itself.

5. Pole piece manufacturing device according to claim 4, characterized in that the stop (23) is detachably connected with the machine body (21).

6. The pole piece manufacturing device according to claim 1, characterized in that the extrusion mechanism (20) is a twin screw extrusion mechanism (20).

7. The pole piece manufacturing device according to claim 1, further comprising a pressure detecting member (50), wherein the pressure detecting member (50) is disposed on the machine body (21), a detecting end of the pressure detecting member (50) extends into the material conveying channel and is located on a conveying path of the dough (2), the pressure detecting member (50) is used for detecting a pressing force applied to the dough (2), and the pressing member (22) is configured to adjust the pressing force applied to the dough (2) to the preset pressure range when the pressing force exceeds the preset pressure range.

8. The pole piece manufacturing apparatus according to any one of claims 1 to 7, further comprising a kneading mechanism (10), the kneading mechanism (10) being located upstream of the extrusion mechanism (20) and being for kneading the material and the slurry into a dough (2).

9. The pole piece manufacturing apparatus according to any one of claims 1 to 7, further comprising a compounding mechanism (40), the compounding mechanism (40) being disposed downstream of the film forming mechanism (30) and being configured to compound the membrane sheet (4) with the base material (5) to form the pole piece (6).

10. The pole piece manufacturing device according to claim 9, further comprising a drying mechanism (110), the drying mechanism (110) being arranged downstream of the compounding mechanism (40), the drying mechanism (110) being adapted to dry the pole piece (6).

11. The pole piece manufacturing device according to claim 9, further comprising a winding mechanism (90), the winding mechanism (90) being arranged downstream of the compound mechanism (40) and being adapted to wind up the pole piece (6).