CN214898503U

CN214898503U - Pole piece forming device

Info

Publication number: CN214898503U
Application number: CN202121467811.4U
Authority: CN
Inventors: 毕汉戎; 曹海尚; 张琦
Original assignee: Times Shangqi Power Battery Co ltd
Current assignee: Times Shangqi Power Battery Co ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-11-26
Anticipated expiration: 2031-06-29

Abstract

The application relates to a pole piece forming device, and belongs to the technical field of battery production equipment. Pole piece forming device, pole piece include the substrate, and the substrate includes non-coating district and the coating district that is used for coating the coating, and non-coating district distributes with coating district in the width direction of substrate alternately, and pole piece forming device includes: the drying mechanism is used for drying the coating coated on the coating area; and the extension mechanism is arranged at the upstream of the drying mechanism along the tape moving direction of the base material and is used for extending the non-coating area. The pole piece forming device reduces the condition of pole piece rolling and belt breakage, and improves the productivity and the product quality.

Description

Pole piece forming device

Technical Field

The application relates to the technical field of battery production equipment, in particular to a pole piece forming device.

Background

At present, the requirement of each large automobile factory on the battery of the electric automobile is higher and higher, and the important point is that the energy density of the battery is higher, the battery capacity is higher under the same weight when the energy density of the battery is higher, and the mileage which can be driven by the single charging of the automobile is correspondingly increased.

In the production process of the battery pole piece, the pole piece is usually rolled to improve the compaction density of the pole piece, and further improve the energy density of the battery. In the prior art, when the pole piece is rolled, the strip is easily broken, and the productivity and the product quality are affected.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a pole piece forming device reduces the broken condition of taking of pole piece roll-in, improves productivity and product quality.

The application is realized by the following technical scheme:

in one aspect, an embodiment of the present application provides a pole piece forming device, where a pole piece includes a substrate, the substrate includes a non-coating area and a coating area for coating a coating, the non-coating area and the coating area are alternately distributed in a width direction of the substrate, and the pole piece forming device includes:

the drying mechanism is used for drying the coating coated on the coating area;

and the extension mechanism is arranged at the upstream of the drying mechanism along the tape moving direction of the base material and is used for extending the non-coating area.

According to pole piece forming device of this application embodiment, the non-coating district of substrate plasticity variation and easy damage behind the drying process, if extend to the non-coating district behind the stoving process, then lead to non-coating district disconnected area easily, extend the non-coating district before the stoving process through extension mechanism, effectively reduce the disconnected area frequency of non-coating district extension process, improve productivity and product quality.

According to some embodiments of the application, the pole piece forming device further comprises: a coating mechanism for applying a coating to the coating zone; wherein, along the tape-moving direction of the base material, the spreading mechanism is arranged at the upstream of the coating mechanism.

In the scheme, the non-coating area is expanded before the coating process, so that the product quality is ensured, and the problem that the weight distribution of the base material is influenced by uneven flow casting of the coating caused by the expansion of the non-coating area when the coating is not cured before drying after coating is avoided.

According to some embodiments of the present application, the coating mechanism includes a first sub-coating mechanism and a second sub-coating mechanism, and the drying mechanism includes a first sub-drying mechanism and a second sub-drying mechanism, and the first sub-coating mechanism, the first sub-drying mechanism, the second sub-coating mechanism, and the second sub-drying mechanism are sequentially disposed along a tape running direction of the base material; the first sub-coating mechanism is used for coating a coating layer on a coating area on a first surface of the base material, the first sub-drying mechanism is used for drying the coating layer on the first surface, the second sub-coating mechanism is used for coating the coating layer on a coating area on a second surface of the base material, the second sub-drying mechanism is used for drying the coating layer on the second surface, and the first surface and the second surface are oppositely arranged along the thickness direction of the base material; and the extending mechanism is arranged at the upstream of the first sub-coating mechanism along the tape moving direction of the base material.

In the above scheme, the coating area on the first surface of the base material is coated with the coating and dried by the first sub-coating mechanism and the first sub-drying mechanism, and the coating area on the second surface of the base material is coated with the coating and dried by the second sub-coating mechanism and the second sub-drying mechanism, so that the coating effects of the first surface and the second surface of the base material are ensured, and the quality of the product is ensured.

According to some embodiments of the application, the spreader mechanism includes a first roller including a roller body and a protrusion disposed around the roller body, the protrusion for abutting the non-coated region.

In the above scheme, the convex part arranged on the roller body acts on the non-coating area, so that the coating area can be extended.

According to some embodiments of the present application, the spreader mechanism further includes a first driving member for driving the first roller to move in a direction perpendicular to an axis of the first roller to adjust a force applied to the non-coating region by the first roller.

In the above scheme, through the first running roller of first driving piece drive removal, can change the position of first running roller, and then change the effort that applies in non-coating district, simple structure adjusts the convenience.

According to some embodiments of the application, the spreader mechanism further includes a pressure sensor for detecting a force applied to the non-coating region by the first roller, and the first driving member is configured to drive the first roller to move according to the force detected by the pressure sensor.

In the scheme, the first driving mechanism drives the first roller to move according to the detection result of the pressure sensor, so that the accurate control of the tension of the base material is realized conveniently.

According to some embodiments of the application, the spreader mechanism further includes a displacement sensor for detecting a displacement of the first roller, and the first driving member is configured to drive the first roller to move according to the displacement detected by the displacement sensor.

In above-mentioned scheme, detect the displacement of first running roller through displacement sensor to the position of first running roller is adjusted according to the displacement of first running roller to first driving piece, and then changes the effort of applying to the substrate.

According to some embodiments of the application, the pole piece forming device further comprises: and the flattening mechanism is arranged at the downstream of the extension mechanism and used for flattening the substrate passing through the extension mechanism along the tape traveling direction of the substrate.

In the scheme, the base material is flattened through the flattening mechanism, so that the flatness of the base material is ensured, and the quality of a product is improved.

According to some embodiments of the present application, the flattening mechanism includes a pair of first flattening rollers that nip the substrate from both sides in the substrate thickness direction, and a pair of second flattening rollers that nip the substrate from both sides in the substrate thickness direction, and an axis of the first flattening rollers and an axis of the second flattening rollers intersect in a projection in the substrate thickness direction.

In the scheme, the base material is flattened at two sides of the thickness direction of the base material through the pair of first flattening rollers and the pair of second flattening rollers, so that the flattening effect is good; the axis of first nip roll intersects with the axis of second nip roll, is convenient for flatten the substrate in the width direction of substrate, guarantees the flat effect of exhibition.

According to some embodiments of the present application, the flattening mechanism includes a third flattening roller including first and second thread segments having opposite handedness.

In the scheme, the first thread section and the second thread section are opposite in rotation direction, so that the third flattening roller has a good flattening effect when contacting with the base material.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic view of a pole piece;

FIG. 2 is a schematic view of a rolled state of a pole piece;

fig. 3 illustrates a pole piece forming apparatus provided in an embodiment of the present application;

FIG. 4 illustrates a schematic view of a spreader mechanism of an embodiment of the present application;

FIG. 5 is a schematic view of the second roller and the third roller according to an embodiment of the present application;

FIG. 6 is a schematic view of a first nip roll and a second nip roll of an embodiment of the present application;

FIG. 7 is a schematic view of a pair of first nip rolls and a pair of second nip rolls of an embodiment of the present application;

fig. 8 is a schematic structural view of a third nip roll according to an embodiment of the present application.

Icon: 10-a spreader mechanism; 11-a first roller; 111-a roller body; 112-a convex part; 12-a first drive member; 13-a pressure sensor; 14-a displacement sensor; 15-a base; 151-vertical beam; 152-a cross beam; 20-a drying mechanism; 21-a first sub-drying mechanism; 22-a second sub-drying mechanism; 30-a coating mechanism; 31-a first sub-coating mechanism; 32-a second sub-coating mechanism; 40-a flattening mechanism; 41-a first nip roll; 42-a second nip roll; 43-a third nip roll; 431-a first thread segment; 432-a second thread segment; 44-a first drive motor; 45-a second drive motor; 46-a third drive motor; 51-a second roller; 52-a third roller; 53-a second drive member; 54-a servo motor; 61-a first guide roll; 62-a second guide roll; 71-unwinding roller; 72-a wind-up roll; 81-a first roll; 82-a second roller; p-pole piece; p1-substrate; p11-non-coated area; p12-coating zone; p2-coating.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the former and latter related objects are in an "or" relationship.

The "plurality" in the present application means two or more (including two), and similarly, "plural" means two or more (including two) and "plural" means two or more (including two).

The core component of the lithium ion battery capable of realizing the repeated charge and discharge function is an electrode component in a battery monomer, and the electrode component comprises a positive electrode piece, a negative electrode piece and an isolating membrane. Lithium ion batteries mainly rely on lithium ions to move between a positive pole piece and a negative pole piece to work.

The positive pole piece comprises a positive pole current collector and a positive pole active substance layer coated on the surface of the positive pole current collector, the current collector which is not coated with the positive pole active substance layer protrudes out of the current collector which is coated with the positive pole active substance layer, and the current collector which is not coated with the positive pole active substance layer is used as a positive pole lug. In general, in a lithium ion battery, the positive electrode current collector may be an aluminum foil, and the positive electrode active material layer may be ternary lithium, lithium manganate, lithium cobaltate, lithium iron phosphate, or the like.

The negative pole piece comprises a negative pole current collector and a negative pole active substance layer coated on the surface of the negative pole current collector, the current collector which is not coated with the negative pole active substance layer protrudes out of the current collector which is coated with the negative pole active substance layer, and the current collector which is not coated with the negative pole active substance layer is used as a negative pole lug. In general, in a lithium ion battery, the negative electrode current collector may be a copper foil, and the negative electrode active material layer may be carbon, silicon, or the like.

The electrode sheet (a general term for the positive electrode sheet and the negative electrode sheet) includes a substrate including a non-coating region and a coating region for applying a coating (which may include an active material layer), the non-coating region and the coating region being alternately distributed in a width direction of the substrate. During the production of the pole pieces, the substrate is typically wound into rolls for movement between processes.

In the production process of the battery pole piece, the pole piece after being dried and coated needs to be rolled, namely a cold pressing process, so as to improve the compaction density of the pole piece and further improve the energy density of the battery. In the process that the pole piece is rolled, the coating area is rolled to generate calendering elongation, and the non-coating area is not rolled to generate almost no elongation, so that the elongation of different areas of the base material is different, and the non-coating area is wrinkled. To maintain the same rate of extension of the substrate, it is necessary to extend the uncoated regions of the substrate, typically before extending the coated regions.

The inventor finds that in the prior art, the broken belt is caused when the pole piece is rolled in the production process of the pole piece, and the non-coating area is broken. Further research shows that the fracture of the non-coating area is caused by the reduction of the plasticity of the base material after the drying process, and the base material is easy to damage in the coating process and the drying process, in this case, the stretching of the non-coating area is easy to cause the strip breakage of the pole piece.

In view of this, the application provides a technical scheme, set up extension mechanism in the upper reaches of stoving mechanism, extend the non-coating region of substrate through extension mechanism, in the follow-up cold pressing process, no longer extend the non-coating region, effectively reduce the broken tape frequency of non-coating region extension process, improve productivity and product quality.

The pole piece forming device can be used for producing pole pieces of batteries.

FIG. 1 shows a schematic of a pole piece; fig. 2 shows a schematic diagram of the rolled state of the pole piece.

As shown in fig. 1 and 2, the pole piece P includes a substrate P1, the substrate P1 includes a non-coating region P11 and a coating region P12 for coating a coating P2, the non-coating region P11 and the coating region P12 are alternately distributed in the width direction of the substrate P1, the substrate P1 may be a metal foil, and the coating P2 may include an active material.

When the pole piece P is rolled after the coating P2 is dried, the pole piece P is positioned between the first roller 81 and the second roller 82, and the pole piece P is compacted through the cooperation of the first roller 81 and the second roller 82.

Fig. 3 shows a pole piece forming device according to an embodiment of the present application. As shown in fig. 3, the pole piece forming device includes a drying mechanism 20 and an extension mechanism 10. The drying mechanism 20 serves to dry the coating P2 (shown in fig. 2) applied on the coating section P12 (shown in fig. 1). The spreading mechanism 10 is disposed upstream of the drying mechanism 20 in the traveling direction of the base material P1, and the spreading mechanism 10 is used to spread the non-coating region P11. It should be noted that upstream and downstream are corresponding, and upstream and downstream refer to the front and back relationship of the processing process, for example, the extension mechanism 10 is disposed upstream of the drying mechanism 20, and the substrate P1 passes through the extension process of the extension mechanism 10 and then passes through the drying process of the drying mechanism 20 during the processing process.

According to the pole piece forming device provided by the embodiment of the application, the plasticity of the non-coating area P11 of the base material P1 is poor and easy to damage after the drying process, if the non-coating area P11 is expanded after the drying process, the non-coating area P11 is easy to break, the non-coating area P11 is expanded before the drying process through the expansion mechanism 10, the non-coating area P11 is not expanded during the subsequent cold pressing of the pole piece P, the frequency of strip breakage in the expansion process of the non-coating area P11 is effectively reduced, and the productivity and the product quality are improved.

According to some embodiments of the present application, the pole piece forming apparatus further comprises a coating mechanism 30, the coating mechanism 30 is used for coating a coating layer P2 to the coating area P12, wherein, along the moving direction of the substrate P1, the spreading mechanism 10 can be arranged upstream of the coating mechanism 30. That is, in the traveling direction of the base material P1, the non-coated region P11 of the base material P1 was first extended, and then the coated region P12 of the base material P1 was coated with the coating layer P2. The non-coating area P11 is expanded before the coating process, the product quality is ensured, and the problem that the weight distribution of the base material P1 is influenced due to uneven casting of the coating P2 in the coating area P12 caused by the expansion of the non-coating area P11 when the coating P2 is not cured before drying after coating is avoided.

According to other embodiments of the present application, the spreading mechanism 10 may also be disposed between the coating mechanism 30 and the drying mechanism 20 along the tape running direction of the substrate P1. That is, in the traveling direction of the base material P1, the coating P2 is applied to the coating region P12 of the base material P1, and then the coating P2 is applied to the non-coating region P11 of the base material P1, and the coating P2 in the coating region P12 is dried.

According to some embodiments of the present application, as shown in fig. 3, the coating mechanism 30 may include a first sub-coating mechanism 31 and a second sub-coating mechanism 32, the drying mechanism 20 includes a first sub-drying mechanism 21 and a second sub-drying mechanism 22, and the first sub-coating mechanism 31, the first sub-drying mechanism 21, the second sub-coating mechanism 32, and the second sub-drying mechanism 22 are sequentially disposed along the tape transport direction of the substrate P1; the first sub-coating mechanism 31 is used for coating a coating P2 (shown in fig. 2) on a coating area P12 on a first side (not shown in the figure) of the base material P1, the first sub-drying mechanism 21 is used for drying the coating P2 on the first side, the second sub-coating mechanism 32 is used for coating a coating P2 on a coating area P12 on a second side (not shown in the figure) of the base material P1, the second sub-drying mechanism 22 is used for drying the coating P2 on the second side, and the first side and the second side are arranged oppositely along the thickness direction of the base material P1; the spreading mechanism 10 is disposed upstream of the first sub-coating mechanism 31 in the traveling direction of the base material P1. The coating region P12 on the first surface of the base material P1 is coated with a coating P2 and a drying coating P2 through the first sub-coating mechanism 31 and the first sub-drying mechanism 21, and the coating region P12 on the second surface of the base material P1 is coated with a coating P2 and a drying coating P2 through the second sub-coating mechanism 32 and the second sub-drying mechanism 22, so that the coating effect of the first surface and the second surface of the base material P1 is ensured, and the quality of products is ensured.

According to other embodiments of the present application, the coating mechanism 30 may also simultaneously apply the coating P2 to the coating zones P12 on the first side and the second side, and the drying mechanism 20 may also simultaneously dry the coating P2 on the first side and the second side, i.e., the coating mechanism 30 is disposed upstream of the drying mechanism 20 in the traveling direction of the substrate P1.

According to some embodiments of the present application, as shown in fig. 3, the pole piece forming apparatus further includes an unwinding roller 71 and a winding roller 72, the unwinding roller 71 is used for providing the substrate P1, and the winding roller 72 is used for winding the dried substrate P1. The unwinding roller 71 is provided with an unwinding driving motor (not shown), and the unwinding driving motor drives the unwinding roller 71 to rotate so as to control the unwinding speed of the substrate P1.

Fig. 4 shows a schematic view of the spreader mechanism 10 of an embodiment of the present application. According to some embodiments of the present application, as shown in fig. 4, the spreading mechanism 10 includes a first roller 11, the first roller 11 includes a roller body 111, and a protrusion 112, the protrusion 112 is circumferentially disposed on the roller body 111, and the protrusion 112 is configured to abut against the non-coating region P11. In the forming process of the pole piece P, the first roller 11 arranges the convex part 112 at the position corresponding to the non-coating area P11, and the non-coating area P11 is subjected to more concentrated tension relative to other areas, so as to generate local additional extension, thereby realizing the extension of the non-coating area P11.

It should be noted that the number of the convex portions 112 may be plural, and the plural convex portions 112 are provided at intervals in a direction parallel to the axial direction of the first roller 11. The number of the protrusions 112 may be the same as the number of the non-coating regions P11.

According to some embodiments of the present application, as shown in fig. 3, the pole piece forming apparatus further includes a first guide roller 61 and a second guide roller 62, the first roller 11 is located between the first guide roller 61 and the second guide roller 62 along the tape running direction of the substrate P1, and the first guide roller 61 and the second guide roller 62 are used for changing the tape running direction of the substrate P1, so that the substrate P1 is pressed against the first roller 11, so as to adjust the force applied to the substrate P1 by changing the position of the first roller 11.

According to some embodiments of the present application, as shown in fig. 4, the spreading mechanism 10 further includes a first driving member 12, and the first driving member 12 is configured to drive the first roller 11 to move in a direction perpendicular to an axis of the first roller 11 to adjust a force applied by the first roller 11 to the non-coating region P11. That is, the first roller 11 is a floating roller, and the position of the first roller 11 can float in the pole piece P forming process. Through the first running roller 11 of first drive 12 drive and remove, can change the position of first running roller 11 in the direction of the axis of the first running roller 11 of perpendicular to further compress tightly pole piece P, or keep away from pole piece P relatively, and then change the effort that applies to non-coating district P11, simple structure, it is convenient to adjust.

It should be noted that, in order to ensure the stable movement of the first roller 11, two first driving members 12 may be provided, and the two first driving members 12 are respectively connected to two axial ends of the first roller 11.

The first driving member 12 may be a telescopic linear driving structure, such as an air cylinder, a hydraulic cylinder, an electric cylinder, etc., and the first driving member 12 may also be other linear driving structures, such as a structure in which an electric motor is engaged with a gear rack. Alternatively, the first driver 12 is a cylinder.

In the embodiment of the present application, as shown in fig. 4, the first driving element 12 is configured to be disposed on the base 15, the base 15 includes two vertical beams 151 and a cross beam 152 connected between the two vertical beams 151, the first driving element 12 is mounted on the cross beam 152, the two vertical beams 151 are used for being fixed to a mounting base (e.g., an equipment body, a workshop or a factory building side wall, a floor, etc.), and the first driving element 12 can drive the first roller 11 to move along a direction perpendicular to an axis of the first roller 11 relative to the two vertical beams 151.

According to some embodiments of the present application, as shown in fig. 4, the spreader mechanism 10 further includes a pressure sensor 13, the pressure sensor 13 is used for detecting the acting force applied to the non-coating region P11 by the first roller 11, and the first driving member 12 is configured to drive the first roller 11 to move according to the acting force detected by the pressure sensor 13. Since the forces act mutually, the force applied by the first roller 11 to the non-coating zone P11 is the pressure transmitted by the substrate P1 to the first roller 11, i.e. the tension of the substrate P1. After the pressure sensor 13 detects the force applied to the non-coating region P11 by the first roller 11, the first driving element 12 corrects the pushing force applied to the first roller 11 by the first driving element 12 according to the force detected by the pressure sensor 13, and maintains the constant stretching tension applied to the base material P1 by the first roller 11.

Since the acting force of the first roller 11 on the base material P1 is not easily measured when the base material P1 is transported, the pressure sensor 13 is disposed at the joint of the cross beam 152 and the vertical beam 151, and based on the mutual action of the forces, the base material P1 provides a reaction force to the first roller, the reaction force is transmitted to the cross beam 152 and transmitted to the joint of the vertical beam 151 and the cross beam 152 through the cross beam 152, that is, the force received by the joint of the vertical beam 151 and the cross beam 152 is related to the acting force received by the base material P1, and the acting force applied to the non-coating area P11 by the first roller 11 is determined by detecting the acting force received by the cross beam 152.

According to some embodiments of the present application, as shown in fig. 4, the spreader mechanism 10 further includes a displacement sensor 14, the displacement sensor 14 is used for detecting the displacement of the first roller 11, and the first driving member 12 is configured to drive the first roller 11 to move according to the displacement detected by the displacement sensor 14. The displacement of the first roller 11 is detected by the displacement sensor 14, so that the first driving member 12 adjusts the position of the first roller 11 according to the displacement of the first roller 11 detected by the displacement sensor 14, thereby changing the acting force applied to the base material P1.

For example, when the first driving member 12 is disposed on the cross beam 152 of the base 15, the displacement sensor 14 can be used to detect the displacement of the first roller 11 relative to the cross beam 152.

Fig. 5 shows a schematic diagram of the cooperation of the second roller 51 and the third roller 52 according to an embodiment of the present application. According to some embodiments of the present application, as shown in fig. 3 and 5, the pole piece forming apparatus further includes a second roller 51, a third roller 52, a second driving member 53, and a servo motor 54. The servo motor 54 is used for driving the second roller 51 to rotate, the rotation of the second roller 51 is converted into the tape speed of the base material P1, and the rotation speed of the second roller 51 is defined as the reference speed of the base material P1. The third roller 52 is a driven roller, the third roller 52 and the second roller 51 are respectively disposed on two sides of the thickness direction of the substrate P1, along the belt moving direction of the substrate P1, the second roller 51 and the third roller 52 are located between the extension mechanism 10 and the drying mechanism 20, and the substrate P1 is disposed between the third roller 52 and the second roller 51. The second driving member 53 is used for driving the second roller 51 to move close to or away from the second roller 51 along a direction perpendicular to the axis of the second roller 51, and the third roller 52 is configured to press the substrate P1 on the second roller 51 under the action of the second driving member 53 so as to avoid the substrate P1 from slipping.

In the production process of the pole piece P, initially, the first roller 11 is positioned at a preset stable position; when the unwinding speed is inconsistent with the speed (reference speed) applied to the substrate P1 by the second roller 51, in order to ensure the stable tension of the substrate P1, the first driving member 12 can drive the first roller 11 to move, that is, the first roller 11 can deviate from the preset stable position, the displacement sensor 14 detects the displacement of the first roller 11, at this time, the unwinding driving motor adjusts the rotating speed of the unwinding roller 71 according to the displacement of the first roller 11 detected by the displacement sensor 14, it is ensured that the unwinding speed of the substrate P1 is consistent with the rotating speed of the second roller 51, and the first roller 11 is recovered to the preset stable position. For example, when the unwinding speed is faster than the rotation speed of the second roller 51, the first roller 11 floats upwards, the acting force applied to the substrate P1 by the first roller 11 increases, the first roller 11 deviates from the preset stable position, the unwinding driving motor reduces the rotation speed, and the first roller 11 gradually moves downwards to the preset position to form a stable speed and tension state.

It should be noted that the second driving member 53 can be a telescopic linear driving structure, such as an air cylinder, a hydraulic cylinder, an electric cylinder, etc., and the second driving member 53 can also be other linear driving structures, such as a structure in which an electric motor is engaged with a rack and pinion. Alternatively, the second driver 53 is a cylinder.

According to some embodiments of the present disclosure, as shown in fig. 3, the second roller 51 may be disposed at a corner of the substrate P1 in the belt direction, i.e., the substrate P1 is disposed at an angle upstream and downstream of the second roller 51, and the substrate P1 has a larger contact area with the second roller 51; the second roller 51 may be a back coating roller, that is, the coating mechanism 30 may coat the coating P2 on the substrate P1 at a position opposite to the second roller 51, and the substrate P1 is supported by the second roller 51, so as to ensure that the coating P2 is uniformly coated.

Specifically, for example, as shown in fig. 3, when the coating mechanism 30 includes the first sub-coating mechanism 31, the first sub-coating mechanism 31 and the second roller 51 are located at opposite sides of the thickness direction of the substrate P1, and since the substrate P1 is pressed against the second roller 51, the second roller 51 can support the substrate P1 when the first sub-coating mechanism 31 coats the coating P2 on the coating area P12 of the substrate P1, so as to ensure that the coating P2 is uniformly coated. In order to ensure that the coating layer P2 is uniformly coated, the base material P1 passes through the third roller 52 and then the first sub-coating mechanism 31 along the turning direction of the second roller 51.

According to some embodiments of the present application, as shown in fig. 3, the pole piece forming device further includes a flattening mechanism 40, the flattening mechanism 40 is disposed downstream of the spreading mechanism 10 along the tape running direction of the substrate P1, and the flattening mechanism 40 is used for flattening the substrate P1 passing through the spreading mechanism 10. The flattening mechanism 40 is used for flattening the base material P1, so that the flatness of the base material P1 is ensured, and the product quality is improved.

FIG. 6 shows a schematic view of the first nip roll 41 and the second nip roll 42 of an embodiment of the present application; fig. 7 shows a schematic view of a pair of first nip rollers 41 and a pair of second nip rollers 42 of an embodiment of the present application. According to some embodiments of the present application, as shown in fig. 6 and 7, the flattening mechanism 40 may include only a pair of first flattening rollers 41 and a pair of second flattening rollers 42, the pair of first flattening rollers 41 nip the substrate P1 from both sides in the thickness direction of the substrate P1, the pair of second flattening rollers 42 nip the substrate P1 from both sides in the thickness direction of the substrate P1, and the axis of the first flattening rollers 41 and the axis of the second flattening rollers 42 intersect in the projection in the thickness direction of the substrate P1. That is, on the projection plane of the base material P1 in the thickness direction, the extension line of the projected axis of the first nip roll 41 intersects with the extension line of the projected axis of the second nip roll 42. The base material P1 is flattened at two sides of the thickness direction of the base material P1 through the pair of first flattening rollers 41 and the pair of second flattening rollers 42, and the flattening effect is good; the axis of the first flattening roller 41 intersects with the axis of the second flattening roller 42, so that the base material P1 is flattened in the width direction of the base material P1, the base material P1 is flattened towards the two sides in the width direction, and the flattening effect is ensured.

It should be noted that the first nip roller 41 and the second nip roller 42 may be a flattening brush, which flattens the substrate P1 while protecting the substrate P1 from damage to the substrate P1.

In order to avoid interference of the first nip roller 41 and the second nip roller 42, the first nip roller 41 and the second nip roller 42 have a gap therebetween, and the end of the first nip roller 41 and the end of the second nip roller 42 are located at the same coating zone P12 to secure the flattening effect of the base material P1.

As shown in fig. 6, in the projection in the thickness direction of the base material P1, the distance between the first nip roll 41 and the second nip roll 42 gradually increases along the running direction of the base material P1, ensuring the flattening effect.

It should be noted that, as shown in fig. 7, each first nip roller 41 may be provided with a first drive motor 44 so as to realize rotational drive of the first nip roller 41; alternatively, a pair of first nip rollers 41 may be provided with a first driving motor 44, and the output end of the first driving motor 44 is connected to the pair of first nip rollers 41 through a transmission assembly. Correspondingly, each second flattening roller 42 is provided with a second driving motor 45 so as to realize the rotation driving of the second flattening roller 42; alternatively, a pair of second nip rollers 42 may be provided with a second drive motor 45, and the output end of the second drive motor 45 is connected to the pair of second nip rollers 42 through a transmission assembly.

Fig. 8 shows a schematic structural view of the third nip roll 43 according to an embodiment of the present application. According to some embodiments of the present application, as shown in fig. 8, the flattening mechanism 40 may further include only the third flattening roller 43, the third flattening roller 43 including the first thread segments 431 and the second thread segments 432, the first thread segments 431 and the second thread segments 432 having opposite rotation directions. Due to the fact that the rotation directions of the first thread segments 431 and the second thread segments 432 are opposite, when the third flattening roller 43 contacts the base material P1, the base material P1 can be flattened towards the two sides in the width direction by the third flattening roller 43, and a good flattening effect is achieved. It is to be noted that the third nip roller 43 is provided with a third drive motor 46, and the third drive motor 46 drives the third nip roller 43 to rotate.

The first thread segments 431 and the second thread segments 432 are symmetrically distributed from the center of the third flattening roller 43 to both sides, and when the base material P1 contacts the roller surface of the third flattening roller 43, friction is generated between the first thread segments 431 and the second thread segments 432, and the inclined threads expand the base material P1 to both sides, so that the base material P1 is flattened.

In order to ensure the flattening effect, as shown in fig. 3, the third flattening roller 43 is disposed at a corner of the substrate P1, that is, the third flattening roller 43 is located at one side in the thickness direction of the substrate P1, the substrate P1 can be pressed against the third flattening roller 43, and the substrate P1 and the third flattening roller 43 have a large contact area, so that the third flattening roller 43 applies a force to the substrate P1. The number of the third nip rollers 43 may be determined according to the actual installation space, for example, as shown in the figure, the third nip rollers 43 are provided two, and two third nip rollers 43 are provided between the spreading mechanism 10 and the coating mechanism 30 in the traveling direction of the base material P1.

According to some embodiments of the present application, as shown in fig. 3, the flattening mechanism 40 may also include the aforementioned pair of first flattening rollers 41, the pair of second flattening rollers 42, and the third flattening roller 43 at the same time. For example, in the running direction of the base material P1, a pair of first nip rollers 41 and a pair of second nip rollers 42 may be located upstream of the third nip rollers 43; for another example, a pair of first nip rollers 41 and a pair of second nip rollers 42 may be located downstream of the third nip roller 43 in the traveling direction of the base material P1. The first flattening roller 41, the second flattening roller 42 and the third flattening roller 43 are used in a matched mode, so that the flattening effect of the base material P1 is improved, and the product quality is guaranteed.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. A pole piece forming device, the pole piece comprising a substrate, the substrate comprising a non-coating area and a coating area for coating, the non-coating area and the coating area being alternately distributed in a width direction of the substrate, the pole piece forming device comprising:

a drying mechanism for drying the coating applied on the coating area;

and the extending mechanism is arranged at the upstream of the drying mechanism along the tape moving direction of the base material and is used for extending the non-coating area.

2. The pole piece molding apparatus of claim 1, further comprising:

a coating mechanism for applying a coating to the coating zone;

wherein, along the tape running direction of the base material, the spreading mechanism is arranged at the upstream of the coating mechanism.

3. The pole piece forming device according to claim 2, wherein the coating mechanism comprises a first sub-coating mechanism and a second sub-coating mechanism, the drying mechanism comprises a first sub-drying mechanism and a second sub-drying mechanism, and the first sub-coating mechanism, the first sub-drying mechanism, the second sub-coating mechanism and the second sub-drying mechanism are sequentially arranged along a tape transport direction of the base material;

the first sub-coating mechanism is used for coating a coating layer on a coating area on a first side of the base material, the first sub-drying mechanism is used for drying the coating layer on the first side, the second sub-coating mechanism is used for coating the coating layer on a second side of the base material, the second sub-drying mechanism is used for drying the coating layer on the second side, and the first side and the second side are oppositely arranged along the thickness direction of the base material;

and the extension mechanism is arranged at the upstream of the first sub-coating mechanism along the tape running direction of the base material.

4. The pole piece forming device of claim 1, wherein the spreader mechanism comprises a first roller comprising a roller body and a protrusion disposed around the roller body, the protrusion configured to abut the non-coated region.

5. The pole piece forming device of claim 4, wherein the spreader mechanism further comprises a first driving member for driving the first roller to move in a direction perpendicular to an axis of the first roller to adjust the force applied by the first roller to the non-coating area.

6. The pole piece forming device of claim 5, wherein the spreader mechanism further comprises a pressure sensor for detecting the force applied by the first roller to the non-coating area, and the first driving member is configured to drive the first roller to move according to the force detected by the pressure sensor.

7. The pole piece forming device of claim 5, wherein the spreader mechanism further comprises a displacement sensor for detecting a displacement of the first roller, and the first driving member is configured to drive the first roller to move according to the displacement detected by the displacement sensor.

8. The pole piece molding apparatus of claim 1, further comprising:

the flattening mechanism is arranged on the downstream of the extension mechanism and used for flattening the substrate passing through the extension mechanism.

9. The pole piece forming device according to claim 8, wherein the flattening mechanism includes a pair of first flattening rollers that sandwich the substrate from both sides in the thickness direction of the substrate, and a pair of second flattening rollers that sandwich the substrate from both sides in the thickness direction of the substrate, and the axes of the first flattening rollers and the second flattening rollers intersect in a projection in the thickness direction of the substrate.

10. The pole piece molding apparatus of claim 8, wherein the flattening mechanism comprises a third flattening roller comprising a first threaded section and a second threaded section, the first threaded section and the second threaded section having opposite rotational directions.