阅读说明：本技术 一种极片成型设备及极片成型工艺 (Pole piece forming equipment and pole piece forming process ) 是由 徐幸 黄成� 叶蓁 刘建竹 于 2021-09-10 设计创作，主要内容包括：本发明公开了一种极片成型设备及极片成型工艺,该极片成型设备包括：放卷机构,放卷机构用于送出极片基材；多组模切组件,多个模切组件在放卷机构的下游依次排列,多个模切组件用于对极片基材依次进行模切,以形成多个具有极耳的待分切极片带；多个分切机构,多个分切机构分别设置于多组模切组件的下游,且与待分切极片带一一对应,分切机构用于对待分切极片带进行分切以形成极片带；多个收卷机构,多个收卷机构分别设置于多个分切机构的下游,收卷机构用于对分切后的极片带进行收卷。本申请能有效提高极片的生产效率,有利于极片的规模化生产。(The invention discloses a pole piece forming device and a pole piece forming process, wherein the pole piece forming device comprises: the unwinding mechanism is used for sending out the pole piece base material; the multiple sets of die cutting assemblies are sequentially arranged at the downstream of the unwinding mechanism and are used for sequentially performing die cutting on the pole piece base material to form multiple pole piece belts to be cut with pole lugs; the cutting mechanisms are respectively arranged at the downstream of the plurality of groups of die cutting assemblies and correspond to the pole piece belts to be cut one by one, and the cutting mechanisms are used for cutting the pole piece belts to be cut to form the pole piece belts; and the winding mechanisms are respectively arranged at the downstream of the cutting mechanisms and are used for winding the cut pole piece belts. The production efficiency of the pole piece can be effectively improved, and the large-scale production of the pole piece is facilitated.)

1. A pole piece forming device is used for cutting a pole piece base material, the pole piece base material comprises a coating area and a blank area which are alternately arranged along the width direction, and the pole piece forming device is characterized by comprising:

the unwinding mechanism is used for sending out the pole piece base material;

the plurality of die cutting assemblies are sequentially arranged at the downstream of the unwinding mechanism and are used for sequentially die cutting the pole piece base material to form a plurality of pole piece belts to be cut with pole lugs;

the cutting mechanisms are respectively arranged at the downstream of the plurality of groups of die cutting assemblies and correspond to the pole piece belts to be cut one by one, and the cutting mechanisms are used for cutting the pole piece belts to be cut to form the pole piece belts;

and the winding mechanisms are respectively arranged on a plurality of downstream cutting mechanisms and are used for winding the pole piece belts after cutting.

2. The pole piece forming apparatus of claim 1, wherein each set of die cutting assemblies comprises two cutters for die cutting the pole piece substrate simultaneously along different margins.

3. The pole piece forming device according to claim 2, wherein the coating area of the pole piece substrate comprises a first narrow-width coating area and a second narrow-width coating area which are positioned at two side edges of the pole piece substrate, and a first wide-width coating area and a second wide-width coating area which are positioned between the first narrow-width coating area and the second narrow-width coating area;

the plurality of groups of die cutting assemblies comprise a first die cutting assembly, a second die cutting assembly and a third die cutting assembly which are sequentially arranged at the downstream of the unreeling mechanism;

the first die cutting assembly comprises two first cutters, wherein one first cutter is used for die cutting the blank areas adjacent to the first narrow-width coating area so that the first narrow-width coating area is cut to form a first narrow-width pole piece strip to be cut with the pole lugs, and the other first cutter is used for die cutting the blank areas adjacent to the second narrow-width coating area so that the second narrow-width coating area is cut to form a second narrow-width pole piece strip to be cut with the pole lugs;

the second die cutting assembly comprises two second cutters, and the two second cutters are respectively used for die cutting of the blank areas on two sides of the first wide coating area to form a first wide pole piece belt to be cut, wherein the two sides of the first wide coating area are provided with pole lugs;

the third die cutting assembly comprises two third cutters, and the two third cutters are respectively used for die cutting of the blank areas on two sides of the second wide coating area so as to form a second wide pole piece belt to be cut, wherein the two sides of the second wide coating area are provided with pole lugs.

4. The pole piece forming device according to claim 3, wherein a first slitting mechanism and a second slitting mechanism are arranged at the downstream of the first die cutting assembly, the first slitting mechanism is used for slitting the first narrow pole piece strip to be slit so as to remove leftover materials of the first narrow pole piece strip to be slit and form the first narrow pole piece strip, and the second slitting mechanism is used for slitting the second narrow pole piece strip to be slit so as to remove leftover materials of the second narrow pole piece strip to be slit and form the second narrow pole piece strip.

5. The pole piece molding device according to claim 4, wherein a first winding mechanism is provided downstream of the first slitting mechanism and downstream of the second slitting mechanism, and the first winding mechanism is used for winding the first narrow-width pole piece belt and the second narrow-width pole piece belt.

6. The pole piece forming device according to claim 4, wherein a first drawing mechanism is arranged between the first die-cutting assembly and the first slitting mechanism, and the first drawing mechanism is used for drawing the first narrow-width pole piece strip to be slit to the first slitting mechanism from the first die-cutting assembly;

and a second traction mechanism is arranged between the first die cutting assembly and the second cutting mechanism and used for drawing the second narrow pole piece strip to be cut to the second cutting mechanism from the first die cutting assembly.

7. The pole piece forming device according to claim 4, wherein a first waste bin is arranged at the downstream of the first slitting mechanism and used for collecting leftover materials of the first narrow pole piece strip to be slit;

and a second waste box is further arranged at the downstream of the second slitting mechanism and used for collecting leftover materials of the second narrow polar piece belt to be slit.

8. The pole piece forming device according to claim 4, wherein a third slitting mechanism is arranged at the downstream of the second die cutting assembly, and the third slitting mechanism is used for slitting the first wide pole piece strip to be slit along the middle line of the first wide pole piece strip to be slit in the width direction so as to form a third narrow pole piece strip and a fourth narrow pole piece strip.

9. The pole piece forming device according to claim 8, wherein a third traction mechanism is arranged between the second die cutting assembly and the third slitting mechanism, and the third traction mechanism is used for drawing the first wide pole piece strip to be slit from the second die cutting assembly to the third slitting mechanism.

10. The pole piece forming device according to claim 8, wherein a fourth slitting mechanism is arranged at the downstream of the third die cutting assembly, and the fourth slitting mechanism is used for slitting the second wide pole piece strip to be slit along the middle line of the second wide pole piece strip to be slit in the width direction so as to form a fifth narrow pole piece strip and a sixth narrow pole piece strip.

11. The pole piece forming device according to claim 10, wherein a fourth traction mechanism is arranged between the third die-cutting assembly and the fourth slitting mechanism, and the fourth traction mechanism is used for drawing the second wide pole piece strip to be slit to the fourth slitting mechanism from the third die-cutting assembly.

12. The pole piece forming device according to claim 10, wherein a second winding mechanism and a third winding mechanism are arranged at the downstream of the third slitting mechanism and the fourth slitting mechanism, the second winding mechanism is used for winding the third narrow-width pole piece belt and the fifth narrow-width pole piece belt, and the third winding mechanism is used for winding the fourth narrow-width pole piece belt and the sixth narrow-width pole piece belt.

13. A pole piece forming process is characterized by comprising the following steps:

die cutting is carried out on the blank areas of the pole piece base material to form a plurality of pole piece belts to be cut with pole lugs;

cutting the pole piece belts to be cut to form a plurality of pole piece belts;

and rolling the pole piece belts.

14. The pole piece forming process of claim 13, wherein before the step of die cutting the blank area of the pole piece base material to form a plurality of pole piece strips to be cut with the pole lugs, the step of die cutting further comprises the following steps:

coating the pole piece base material at unequal intervals along the width direction of the pole piece base material to form coating areas and blank areas which are alternately arranged;

the coating area of the pole piece substrate comprises a first narrow-width coating area and a second narrow-width coating area which are positioned at the edges of two sides of the pole piece substrate, and a first wide-width coating area and a second wide-width coating area which are positioned between the first narrow-width coating area and the second narrow-width coating area.

15. The pole piece forming process of claim 14, wherein the die cutting of the margin areas of the pole piece substrate to form a plurality of pole piece strips to be cut with the pole lugs comprises:

die cutting is carried out on the blank areas adjacent to the first narrow width coating area, so that the first narrow width coating area is cut to form a first narrow width pole piece strip to be cut with the pole lugs, and simultaneously die cutting is carried out on the blank areas adjacent to the second narrow width coating area, so that the second narrow width coating area is cut to form a second narrow width pole piece strip to be cut with the pole lugs;

die cutting is carried out on the blank areas on two sides of the first wide coating area to form a first wide pole piece belt to be cut, wherein the two sides of the first wide coating area are provided with pole lugs;

and die cutting is carried out on the blank areas on two sides of the second wide coating area to form a second wide pole piece belt to be cut, wherein the two sides of the second wide coating area are provided with pole lugs.

16. The pole piece forming process of claim 15, wherein the slitting of the plurality of pole piece strips to be slit to form a plurality of pole piece strips comprises:

cutting the first narrow-width pole piece strip to be cut to remove leftover materials of the first narrow-width pole piece strip to be cut so as to form a first narrow-width pole piece strip;

cutting the second narrow-width pole piece strip to be cut to remove leftover materials of the second narrow-width pole piece strip to be cut so as to form a second narrow-width pole piece strip;

cutting the first wide pole piece belt to be cut along the center line of the width direction of the first wide pole piece belt to be cut so as to form a third narrow pole piece belt and a fourth narrow pole piece belt;

and slitting the second wide pole piece belt to be slit along the central line of the second wide pole piece belt to be slit in the width direction so as to form a fifth narrow pole piece belt and a sixth narrow pole piece belt.

17. The pole piece molding process of claim 16, wherein said winding a plurality of said pole piece strips comprises:

winding the first narrow-width pole piece belt and the second narrow-width pole piece belt to a first winding mechanism;

winding the third narrow-width pole piece belt and the fifth narrow-width pole piece belt to a second winding mechanism;

and winding the fourth narrow pole piece belt and the sixth narrow pole piece belt to a third winding mechanism.

Technical Field

The application relates to the technical field of lithium ion battery production equipment, in particular to pole piece forming equipment and a pole piece forming process.

Background

The lithium ion battery is a new generation of green high-energy battery with excellent performance, and has become one of the key points of high and new technology development. The lithium ion battery has the advantages of high voltage, high capacity, low consumption, no memory effect, no public hazard, small volume, small internal resistance, less self-discharge, more cycle times and the like.

The pole piece is used as an important component of the lithium battery and plays an important role in the performance of the battery. The pole piece comprises a substrate and pole lugs distributed on one side or two sides of the substrate, a raw material belt for preparing the pole piece is generally wider than a single pole piece, and the raw material belt is provided with a coating area and a blank area which are mutually spaced. When the pole piece is manufactured, the coating area is usually cut in a cutting mode to form a cutting base material, and then the cutting base material is subjected to die cutting to cut off waste materials to form the pole piece.

However, in the prior art, the pole piece forming equipment can only cut two pole pieces at a time, i.e. a mode of one pole piece forming and two pole pieces forming is adopted, so that the production efficiency of the pole pieces is low, and the requirement of large-scale production is difficult to adapt.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the pole piece forming equipment and the pole piece forming process, which can effectively improve the production efficiency of the pole piece and are beneficial to the large-scale production of the pole piece.

In order to solve the above technical problems, in a first aspect, the present invention provides a pole piece forming apparatus for cutting a pole piece substrate, the pole piece substrate including a coating region and a blank region alternately arranged in a width direction, the pole piece forming apparatus comprising: the unwinding mechanism is used for sending out the pole piece base material; the multiple sets of die cutting assemblies are sequentially arranged at the downstream of the unwinding mechanism and are used for sequentially performing die cutting on the pole piece base material to form multiple pole piece belts to be cut with pole lugs; the cutting mechanisms are respectively arranged at the downstream of the plurality of groups of die cutting assemblies and correspond to the pole piece belts to be cut one by one, and the cutting mechanisms are used for cutting the pole piece belts to be cut to form the pole piece belts; and the winding mechanisms are respectively arranged at the downstream of the cutting mechanisms and are used for winding the cut pole piece belts.

According to the invention, the pole piece base material is sequentially subjected to die cutting through the plurality of groups of die cutting assemblies, so that the die cutting efficiency of the pole piece base material is improved, and the plurality of slitting mechanisms are arranged, and the number of the slitting mechanisms corresponds to that of the plurality of pole piece belts to be slit, so that the plurality of slitting mechanisms can correspondingly slit the plurality of pole piece belts to be slit, further a plurality of formed pole piece belts are formed, and the efficiency of forming the pole piece belts is improved. In addition, a plurality of winding mechanisms are arranged at the downstream of the splitting mechanism, so that a plurality of pole piece belts can be wound respectively, the winding efficiency of the pole piece belts is improved, the production efficiency of the pole piece belts is further improved, and the large-scale production of the pole piece belts is facilitated.

In a possible implementation manner of the first aspect, each group of die cutting assemblies includes two cutters, and the two cutters are respectively used for synchronously die cutting the pole piece base material along different blank areas so as to improve the die cutting efficiency of the die cutting assemblies.

In a possible implementation manner of the first aspect, the coating area of the pole piece substrate comprises a first narrow-width coating area and a second narrow-width coating area which are positioned at two side edges of the pole piece substrate, and a first wide-width coating area and a second wide-width coating area which are positioned between the first narrow-width coating area and the second narrow-width coating area; the plurality of groups of die cutting assemblies comprise a first die cutting assembly, a second die cutting assembly and a third die cutting assembly which are sequentially arranged at the downstream of the unreeling mechanism; the first die cutting assembly comprises two first cutters, wherein one first cutter is used for die cutting the blank areas adjacent to the first narrow-width coating area so that the first narrow-width coating area is cut to form a first narrow-width pole piece strip to be cut with the pole lugs, and the other first cutter is used for die cutting the blank areas adjacent to the second narrow-width coating area so that the second narrow-width coating area is cut to form a second narrow-width pole piece strip to be cut with the pole lugs; the second die cutting assembly comprises two second cutters, and the two second cutters are respectively used for die cutting the blank areas on two sides of the first wide coating area to form a first wide pole piece strip to be cut with pole lugs on two sides; the third die cutting assembly comprises two third cutters, the two third cutters are respectively used for die cutting of the blank areas on two sides of the second wide coating area to form a second wide pole piece strip to be cut, with pole lugs on two sides, and the efficiency of pole lug die cutting is effectively improved.

In a possible implementation manner of the first aspect, a first slitting mechanism and a second slitting mechanism are arranged at the downstream of the first die cutting assembly, the first slitting mechanism is used for slitting the first narrow pole piece belt to be slit to remove leftover materials of the first narrow pole piece belt to be slit to form the first narrow pole piece belt, the second slitting mechanism is used for slitting the second narrow pole piece belt to be slit to remove leftover materials of the second narrow pole piece belt to be slit to form the second narrow pole piece belt, and slitting of the first narrow pole piece belt to be slit and the second narrow pole piece belt to be slit formed by die cutting of the two first cutters is achieved.

In a possible implementation manner of the first aspect, a first winding mechanism is arranged at the downstream of the first slitting mechanism and the downstream of the second slitting mechanism, and the first winding mechanism is used for winding the first narrow-width pole piece belt and the second narrow-width pole piece belt so as to improve the winding effect of the first narrow-width pole piece belt and the second narrow-width pole piece belt.

In a possible implementation manner of the first aspect, a first traction mechanism is arranged between the first die cutting assembly and the first cutting mechanism, and the first traction mechanism is used for drawing the first narrow pole piece belt to be cut to the first cutting mechanism from the first die cutting assembly so that the first cutting mechanism receives and cuts the formed first narrow pole piece belt to be cut; and a second traction mechanism is arranged between the first die cutting assembly and the second slitting mechanism and used for dragging the second to-be-slit narrow pole piece belt to the second slitting mechanism from the first die cutting assembly so as to facilitate the second slitting mechanism to receive and slit the formed first to-be-slit narrow pole piece belt.

In a possible implementation manner of the first aspect, a first waste bin is further arranged at the downstream of the first slitting mechanism, and the first waste bin is used for collecting leftover materials of the first narrow polar strip to be slit; the low reaches of second slitting mechanism still are equipped with the second dump bin, and the second dump bin is used for collecting the second and treats the leftover bits of cutting narrow width pole piece area to the collection of leftover bits, and then maintain operation environment's clean and tidy nature.

In a possible implementation manner of the first aspect, a third slitting mechanism is arranged at the downstream of the second die cutting assembly, and the third slitting mechanism is used for slitting the first to-be-slit wide pole piece belt along a central line in the width direction of the first to-be-slit wide pole piece belt to form a third narrow pole piece belt and a fourth narrow pole piece belt, so that the purpose of slitting the second to-be-slit wide pole piece belt is achieved.

In a possible implementation manner of the first aspect, a third traction mechanism is arranged between the second die cutting assembly and the third die cutting mechanism, and the third traction mechanism is used for dragging the first to-be-cut wide pole piece belt to the third die cutting mechanism from the second die cutting assembly so as to improve the effect of the third die cutting mechanism on receiving and cutting the first to-be-cut wide pole piece.

In a possible implementation manner of the first aspect, a fourth slitting mechanism is arranged at the downstream of the third die cutting assembly, and the fourth slitting mechanism is used for slitting the second to-be-slit wide pole piece tape along a central line in the width direction of the second to-be-slit wide pole piece tape to form a fifth narrow pole piece tape and a sixth narrow pole piece tape, so that the purpose of slitting the second to-be-slit wide pole piece tape is achieved.

In a possible implementation manner of the first aspect, a fourth traction mechanism is arranged between the third die cutting assembly and the fourth slitting mechanism, and the fourth traction mechanism is used for drawing the second wide pole piece belt to be slit to the fourth slitting mechanism from the third die cutting assembly.

In a possible implementation manner of the first aspect, a second winding mechanism and a third winding mechanism are arranged at the downstream of the third slitting mechanism and the fourth slitting mechanism, the second winding mechanism is used for winding a third narrow pole piece belt and a fifth narrow pole piece belt, and the third winding mechanism is used for winding a fourth narrow pole piece belt and a sixth narrow pole piece belt, so that the winding effects of the first winding mechanism and the second winding mechanism are improved.

In a second aspect, the invention further provides a pole piece forming process, which comprises the following steps:

die cutting is carried out on the blank areas of the pole piece base material to form a plurality of pole piece belts to be cut with pole lugs; cutting the pole piece belts to be cut to form a plurality of pole piece belts; and rolling the pole piece belts.

According to the pole piece forming process provided by the invention, the pole piece base material provided by the unwinding mechanism is respectively processed by the multiple groups of die cutting assemblies and the multiple groups of die cutting mechanisms to form the multiple pole piece belts, so that the processing efficiency of the pole piece belts is effectively improved, and the multiple winding mechanisms are respectively adopted to wind the multiple pole piece belts, so that the winding efficiency of the multiple pole piece belts is improved, and further the production efficiency of the pole piece belts is improved.

In a possible implementation manner of the second aspect, before die-cutting the margin area of the electrode sheet base material to form a plurality of electrode sheet belts to be cut with the electrode tabs, the method further includes: coating the pole piece base material at unequal intervals along the width direction of the pole piece base material to form coating areas and blank areas which are alternately arranged; the coating area of the pole piece substrate comprises a first narrow-width coating area and a second narrow-width coating area which are positioned at the edges of two sides of the pole piece substrate, and a first wide-width coating area and a second wide-width coating area which are positioned between the first narrow-width coating area and the second narrow-width coating area. Therefore, the processing technology operation of the pole piece substrate is convenient.

In a possible implementation manner of the second aspect, the die cutting the margin area of the pole piece base material to form a plurality of pole piece belts to be cut with pole lugs includes: die cutting is carried out on the blank areas adjacent to the first narrow-width coating area so that the first narrow-width coating area is cut to form a first narrow-width pole piece belt to be cut with the pole lugs, and meanwhile die cutting is carried out on the blank areas adjacent to the second narrow-width coating area so that the second narrow-width coating area is cut to form a second narrow-width pole piece belt to be cut with the pole lugs; die cutting is carried out on the blank areas on two sides of the first wide coating area to form a first wide pole piece belt to be cut, wherein the two sides of the first wide coating area are provided with pole lugs; and die cutting is carried out on the blank areas on two sides of the second wide coating area to form a second wide pole piece belt to be cut, wherein the two sides of the second wide coating area are provided with pole lugs. Therefore, the efficiency of die cutting the pole piece base material is improved.

In a possible implementation manner of the second aspect, slitting the plurality of pole piece belts to be slit to form the plurality of pole piece belts includes: cutting the first narrow-width pole piece belt to be cut to remove leftover materials of the first narrow-width pole piece belt to be cut so as to form a first narrow-width pole piece belt; cutting the second narrow-width pole piece belt to be cut to remove leftover materials of the second narrow-width pole piece belt to be cut so as to form a second narrow-width pole piece belt; cutting the first wide pole piece belt to be cut along the center line of the width direction of the first wide pole piece belt to be cut so as to form a third narrow pole piece belt and a fourth narrow pole piece belt; and cutting the second wide pole piece belt to be cut along the central line of the second wide pole piece belt to be cut in the width direction so as to form a fifth narrow pole piece belt and a sixth narrow pole piece belt. Therefore, the cutting efficiency of the pole piece belt to be cut is improved.

In a possible implementation manner of the second aspect, the winding the plurality of pole piece belts includes: winding the first narrow pole piece belt and the second narrow pole piece belt to a first winding mechanism; winding the third narrow pole piece belt and the fifth narrow pole piece belt to a second winding mechanism; and winding the fourth narrow pole piece belt and the sixth narrow pole piece belt to a third winding mechanism. From this, improved the rolling efficiency of pole piece area.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a pole piece forming apparatus provided in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a pole piece substrate after being coated with unequal widths according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a blank area of a pole piece substrate having a tab die-cutting profile according to an embodiment of the present invention;

fig. 4 is a schematic view of a first narrow pole piece strip to be cut formed after die cutting of a pole piece substrate according to an embodiment of the present invention;

fig. 5 is a schematic view of a second narrow pole piece strip to be slit formed after die cutting of a pole piece substrate according to an embodiment of the present invention;

fig. 6 is a schematic view of a first wide pole piece strip to be cut (a second wide pole piece strip to be cut) formed after die cutting of a pole piece substrate according to an embodiment of the present invention;

fig. 7 is a schematic view of the first narrow pole piece strip to be slit to form a first narrow pole piece strip according to the embodiment of the present invention;

fig. 8 is a schematic view of a second narrow pole piece strip to be slit to form a second narrow pole piece strip according to an embodiment of the present invention;

fig. 9 is a schematic view of the first wide pole piece strip to be slit (second wide pole piece strip to be slit) being slit into a second wide pole piece strip to be slit (second wide pole piece strip) according to the embodiment of the present invention;

fig. 10 is a schematic structural view of a conventional electrode sheet base material;

fig. 11 is a schematic view of a prior art tab substrate having a tab die cut profile;

FIG. 12 is a flow chart of the production of a pole piece according to an embodiment of the present invention;

FIG. 13 is a flowchart illustrating a specific process of step S10 according to an embodiment of the present invention;

FIG. 14 is a flowchart illustrating a specific process of step S20 according to an embodiment of the present invention;

fig. 15 is a flowchart illustrating a specific process of step S30 according to an embodiment of the present invention.

Description of reference numerals:

100-pole piece forming equipment; 110-an unwinding mechanism; 121-a first die cut component; 122-a second die cut component; 123-a third die cut component; 131-a first slitting mechanism; 132-a second slitting mechanism; 133-a third slitting mechanism; 134-a fourth slitting mechanism; 141-a first winding mechanism; 142-a second winding mechanism; 143-a third winding mechanism; 151-a first traction mechanism; 152-a second traction mechanism; 153-a third traction mechanism; 161-a first waste bin; 162-a second waste bin; 200-pole piece substrate; 211-a first narrow width coating zone; 2111-first narrow polar-piece band to be cut; 2112-first narrow pole piece strip; 212-a second narrow width coating zone; 2121-second narrow polar-piece belts to be slit; 2122-second narrow pole piece strip; 220-white space; 221-a first whitespace region; 222-second whitespace region; 223-third whitespace region; 231 — first broad width coating zone; 2311-cutting the first wide polar piece belt to be cut; 2312-a third narrow pole piece band; 2313-a fourth narrow pole piece band; 232-a second broad width coating zone; 2321-second wide polar-piece belt to be slit; 2322-fifth narrow pole piece band; 2323-sixth narrow pole piece band; 240-leftover materials; 300-conventional pole piece base; 310-pole piece coating area; 320-reserving a blank area of the wide pole piece; 330-narrow pole piece blank area.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.

In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.

Lithium ion batteries, as an electrochemical energy storage system, have been an important technology indispensable for new energy development and utilization due to their outstanding advantages, and have the advantages of high voltage, high capacity, low consumption, no memory effect, no public hazard, small volume, small internal resistance, less self-discharge, many cycle times and the like, and are widely applied to civil and military fields such as mobile phones, notebook computers, video cameras, digital cameras and the like.

In the process of manufacturing the pole piece of the lithium ion battery, a pole piece forming device is generally adopted to process a base material to form the pole piece. The pole piece is used as an important component of the lithium battery, and has great service life and use effect on the lithium battery. Specifically, the pole piece comprises a substrate and pole lugs distributed on one side or two sides of the substrate.

Pole piece former includes substrate unwinding mechanism and sets gradually cutting mechanism and die-cutting mechanism in substrate unwinding mechanism's low reaches, and substrate unwinding mechanism is used for seeing off the substrate to cutting mechanism, cuts the mechanism and is used for cutting processing to the substrate to form and cut the substrate, and die-cutting mechanism is used for carrying out the cross cutting to cutting the substrate in order to cut away the waste material, obtains two fashioned pole piece areas.

In the fashioned manufacturing process of pole piece, the cutting mechanism among the pole piece former can only form two to treating the cross cutting pole piece area to the substrate processing of seeing off from the substrate unwinding mechanism, and two are treated the cross cutting pole piece area and are passed through the processing of die cutting mechanism, can form two fashioned pole piece areas at last, promptly, pole piece former can only realize the processing of one play two modes, leads to the production efficiency of pole piece lower, is difficult to adapt to the demand of scale production.

In view of this point, the embodiment of the present invention provides a pole piece forming apparatus 100 and a pole piece forming process, which can effectively improve the production efficiency of a pole piece and facilitate the mass production of the pole piece.

The pole piece forming apparatus 100 and the pole piece forming process are described in detail below with specific embodiments:

example one

The embodiment of the application provides a pole piece forming equipment 100, as shown in fig. 1, this pole piece forming equipment 100 includes unwinding mechanism 110 and sets gradually the multiunit cross cutting subassembly in unwinding mechanism 110 low reaches, a plurality of mechanisms and a plurality of winding mechanisms cut, unwinding mechanism 110 is used for seeing off pole piece substrate 200, the cross cutting subassembly is used for carrying out the cross cutting to pole piece substrate 200 that unwinding mechanism 110 saw off and forms and treat the pole piece area of cutting, it is used for treating to cut the pole piece area and cut and form the pole piece area to cut the mechanism, winding mechanism is used for carrying out the rolling to the pole piece area.

The pole piece forming equipment 100 is used for cutting the pole piece base material 200, and the pole piece base material 200 comprises coating areas and blank areas 220 which are alternately arranged in the width direction.

Specifically, a plurality of die cutting assemblies are arranged in sequence at the downstream of the unwinding mechanism 110, and the plurality of die cutting assemblies are used for die cutting the pole piece base material 200 in sequence to form a plurality of pole piece belts to be cut with pole lugs. The cutting mechanisms are respectively arranged at the downstream of the multiple groups of die cutting assemblies and are in one-to-one correspondence with the pole piece belts to be cut, and the cutting mechanisms are used for cutting the pole piece belts to be cut to form the pole piece belts. A plurality of winding mechanisms set up respectively in a plurality of low reaches of cutting the mechanism, and winding mechanism is used for carrying out the rolling to the pole piece area after cutting.

Because the multiunit cross cutting subassembly is cross cutting in proper order to pole piece substrate 200 has been set up, the cross cutting efficiency of pole piece substrate 200 has been improved, again because a plurality of mechanisms of cutting have been set up, and the quantity that a plurality of mechanisms of cutting correspond with a plurality of quantity of waiting to cut the pole piece area, make a plurality of mechanisms of cutting can correspond and cut a plurality of pole piece areas of waiting to cut, and then form a plurality of fashioned pole piece areas, the efficiency of forming the pole piece area has been improved, so, can carry out cross cutting in proper order to pole piece substrate 200 that unwinding mechanism 110 provided through multiunit cross cutting subassembly and multicomponent cutting mechanism, the processing of cutting is in order to form many pole piece areas, the machining efficiency of pole piece area has effectively been improved. In addition, a plurality of winding mechanisms are arranged at the downstream of the splitting mechanism, so that a plurality of pole piece belts can be wound respectively, the winding efficiency of the pole piece belts is improved, the production efficiency of the pole piece belts is further improved, and the large-scale production of the pole piece belts is facilitated.

In this embodiment, the height of the tab gradually decreases along the length direction of the pole piece strip, or the height of the tab gradually increases along the length direction of the pole piece strip, and the height of the tab refers to the distance that the tab protrudes out of the coating area and extends along the width direction of the coating area.

In order to improve the effect of transmitting the pole piece substrate 200 from the unwinding mechanism 110 to the multiple sets of die cutting assemblies, a roller passing device is arranged between the unwinding mechanism 110 and the multiple sets of die cutting assemblies, and the roller passing device is used for transmitting the pole piece substrate 200 sent out from the unwinding mechanism 110 to the multiple sets of die cutting assemblies.

In addition, in the preparation process of the lithium ion battery, the pole piece belt in the winding mechanism needs to be cut along the length direction of the pole piece belt to form a pole piece with a preset length, and the pole piece is transmitted to a corresponding process for processing the lithium ion battery.

In this embodiment, in order to ensure the tensioning effect of the pole piece belt, the winding mechanism is set to be a slip winding mechanism, the slip winding mechanism includes a slip shaft and a winding driver for driving the slip shaft to rotate, and a plurality of sets of slip rings on the circumferential wall of the slip shaft slip with a certain slip torque to compensate the speed difference of each position of the pole piece belt, so as to control the tension of the pole piece belt and achieve an ideal winding effect. Specifically, the slip shaft consists of a shaft core, a friction assembly and a plurality of groups of slip rings, the friction torque of the slip shaft is controlled by the air pressure of compressed air, each group of slip rings is in an independent slip state, and the slip torque of each group of slip rings is controlled by the central air pressure and the air pressure transmitted from the side surface, so that the purposes of constant and uniform tension and tidy end surfaces of the pole piece belt from the inner roll diameter to the outer roll diameter are achieved, and the tension degree of the pole piece belt is further ensured.

The coating region of the pole piece substrate 200 is provided in various forms, for example, as shown in fig. 2, the coating region of the pole piece substrate 200 includes a first narrow width coating region 211 and a second narrow width coating region 212 at both side edges of the pole piece substrate 200, and a first wide width coating region 231 and a second wide width coating region 232 between the first narrow width coating region 211 and the second narrow width coating region 212, wherein the width of the first wide width coating region 231 is twice the width of the first narrow width coating region 211, so that the first wide width coating region 231 can form two first narrow width coating regions 211 by cutting along the middle line of the width direction thereof, to ensure the same size of the formed pole piece tape, and similarly, the width of the second wide width coating region 232 is also twice the width of the second narrow width coating region 212, to ensure the same size of the formed pole piece tape.

In order to improve the die cutting efficiency of the die cutting assemblies, each group of die cutting assemblies includes two cutters, and the two cutters are respectively used for synchronously die cutting the pole piece base material 200 along the different blank areas 220, for example, as shown in fig. 2, the pole piece base material 200 has a first blank area 221, a second blank area 222 and a third blank area 223, the two cutters forming each group of die cutting assemblies are respectively arranged corresponding to the first blank area 221 and the second blank area 222, and cut along the die cutting track of the tab for the first blank area 221 and the second blank area 222 to form the tab.

The cutter may be a laser, the laser emits laser to the blank area 220, and the laser performs die cutting on the blank area 220 along a die cutting track of the tab to form the tab.

As shown in fig. 1, the multiple sets of die cutting assemblies include a first die cutting assembly 121, a second die cutting assembly 122, and a third die cutting assembly 123 sequentially arranged downstream of the unwinding mechanism 110, so as to perform die cutting on the tab substrate 200 along the tab die cutting track on the blank area 220 to form multiple sets of tabs, as shown in fig. 3, the efficiency of tab die cutting is effectively improved.

Specifically, the first die-cutting assembly 121 includes two first cutters, one of which is used for die-cutting the margin area 220 adjacent to the first narrow-width coating area 211 so that the first narrow-width coating area 211 is cut to form the first to-be-slit narrow-width pole piece strip 2111 with the tab, as shown in fig. 4, and the other of which is used for die-cutting the margin area 220 adjacent to the second narrow-width coating area 212 so that the second narrow-width coating area 212 is cut to form the second to-be-slit narrow-width pole piece strip 2121 with the tab, as shown in fig. 5. The second die cutting assembly 122 includes two second cutters for respectively die cutting the margin areas 220 at both sides of the first wide width coating area 231 to form a first wide width tab strip 2311 to be slit having tabs at both sides, as shown in fig. 6. The third die cutting assembly 123 includes two third cutters, and the two third cutters are respectively used for die cutting the blank areas 220 on two sides of the second wide width coating area 232 to form a second wide width pole piece strip 2321 to be slit and provided with tabs on two sides, as shown in fig. 6.

Wherein, as shown in fig. 2, the first narrow pole piece strip 2111 to be slit is adjacent to the first wide pole piece strip 2311 to be slit, the second narrow pole piece strip 2121 to be slit is adjacent to the second wide pole piece strip 2321 to be slit, in order to improve the utilization rate of the pole piece substrate 200, the tab of the first narrow pole piece strip 2111 to be slit and the tab of the first wide pole piece strip 2311 to be slit share a blank leaving area 220, and the tab of the first narrow pole piece strip 2111 and the tab of the first wide pole piece strip 2311 to be slit are in staggered and meshed arrangement, similarly, the tab of the second narrow pole piece strip 2121 to be slit and the tab of the second wide pole piece strip 2321 to be slit are in staggered and meshed arrangement, therefore, the maximum width value of the blank leaving area 220 is the sum of the height value and the width value of the waste edge reserved, as shown in fig. 10, the tabs corresponding to the adjacent coating areas are in relative arrangement, therefore, the width of the blank area is the sum of the height values of the two tabs and the reserved width of the waste edge, and therefore, the die cutting mode of the scheme in the embodiment can effectively reduce the waste of the pole piece base material 200.

In addition, as shown in fig. 2 and fig. 3, in order to ensure the die cutting effect of the die cutting assembly on the premise of improving the utilization rate of the pole piece base material 200, the reserved width of the waste edge is limited to be between 4mm and 5mm, and if the reserved width of the waste edge is smaller than 4mm, the die cutting effect is difficult to ensure when the die cutting assembly is subjected to die cutting, so that the rejection rate is improved. If the width of the waste edge is greater than 5mm, a large amount of waste of the pole piece substrate 200 will be caused.

In order to ensure the stability and consistency of the tape running of the pole piece substrate 200, the edge is reserved with the width of the leftover material 240 on the pole piece substrate 200, for example, the width of the leftover material 240 is 5mm, and the first slitting mechanism 131 and the second slitting mechanism 132 are used for removing the leftover material 240 at the side of the first narrow-width pole piece tape 2111 to be slit and the second narrow-width pole piece tape 2121 to be slit. Specifically, as shown in fig. 7, a first slitting mechanism 131 and a second slitting mechanism 132 are disposed downstream of the first die-cutting assembly 121, wherein the first slitting mechanism 131 is configured to slit the first narrow-width pole piece strip 2111 to remove the leftover material 240 of the first narrow-width pole piece strip 2111 to form a first narrow-width pole piece strip 2112, and as shown in fig. 8, the second slitting mechanism 132 is configured to slit the second narrow-width pole piece strip 2121 to remove the leftover material 240 of the second narrow-width pole piece strip 2121 to form a second narrow-width pole piece strip 2122.

In view of the effect of the first slitting mechanism 131 and the second slitting mechanism 132 receiving and slitting the first to-be-slit narrow-width pole piece tape 2111 and the second to-be-slit narrow-width pole piece tape 2121, respectively, a conveying device is provided for conveying the first to-be-slit narrow-width pole piece tape 2111 to the first slitting mechanism 131 and conveying the second to-be-slit narrow-width pole piece tape 2121 to the second slitting mechanism 132, wherein the conveying device has various structures, for example, the conveying device is a traction mechanism.

Specifically, as shown in fig. 1, the drawing mechanism includes a first drawing mechanism 151 and a second drawing mechanism 152, the first drawing mechanism 151 is disposed between the first die-cutting assembly 121 and the first cutting mechanism 131, and the first drawing mechanism 151 is configured to draw the first to-be-cut narrow-width pole piece strip 2111 from the first die-cutting assembly 121 to the first cutting mechanism 131, so that the first to-be-cut narrow-width pole piece strip 2111 is received and cut by the first cutting mechanism 131. The second drawing mechanism 152 is disposed between the first die cutting assembly 121 and the second slitting mechanism 132, and the second drawing mechanism 152 is configured to draw the second to-be-slit narrow-width pole piece strip 2121 from the first die cutting assembly 121 to the second slitting mechanism 132, so that the second slitting mechanism 132 receives and slits the formed second to-be-slit narrow-width pole piece strip 2121.

Of course, the first die cutting assembly 121, the second die cutting assembly 122 and the third die cutting assembly 123 included in the multiple sets of die cutting assemblies can also be arranged in parallel to achieve die cutting of the pole piece base material 200 at the same time, so that a six-mode die cutting is achieved, the efficiency of the pole piece die cutting is effectively improved, and meanwhile, the die cutting period of the pole piece base material 200 is shortened.

Referring to fig. 1, a first narrow-width pole piece band 2112 slit by the first slitting mechanism 131 and a second narrow-width pole piece band 2122 slit by the second slitting mechanism 132 are wound by the first winding mechanism 141, specifically, the first winding mechanism 141 is disposed downstream of the first slitting mechanism 131 and downstream of the second slitting mechanism 132, and the first winding mechanism 141 is configured to wind the first narrow-width pole piece band 2112 and the second narrow-width pole piece band 2122 simultaneously, so as to improve the winding effect of the first narrow-width pole piece band 2112 and the second narrow-width pole piece band 2122.

In addition, the leftover materials 240 cut off from the first to-be-slit narrow-width pole piece band 2111 and the second to-be-slit narrow-width pole piece band 2121 are collected through a waste bin, specifically, the waste bin includes a first waste bin 161 and a second waste bin 162, the first waste bin 161 is disposed downstream of the first slitting mechanism 131, the first waste bin 161 is used for collecting the leftover materials 240 of the first to-be-slit narrow-width pole piece band 2111, the second waste bin 162 is disposed downstream of the second slitting mechanism 132, the second waste bin 162 is used for collecting the leftover materials 240 of the second to-be-slit narrow-width pole piece band 2121, and the first waste bin 161 and the second waste bin 162 are disposed to facilitate the collection of the leftover materials 240 and further maintain the tidiness of the working environment.

In order to slit the first wide-width pole piece tape 2311, a third slitting mechanism 133 is disposed downstream of the second die cutting assembly 122, as shown in fig. 1 and 9, and the third slitting mechanism 133 is configured to slit the first wide-width pole piece tape 2311 along a center line in the width direction of the first wide-width pole piece tape 2311 to form a third narrow-width pole piece tape 2312 and a fourth narrow-width pole piece tape 2313. Since the width of the first wide application region 231 is twice the width of the first narrow application region 211, the size of the slit third and fourth narrow pole piece strips 2312 and 2313 is the same as that of the first narrow pole piece strip 2112.

In consideration of the effect of the third slitting mechanism 133 receiving and slitting the first to-be-slit wide pole pieces, a conveying device is arranged between the downstream of the second die cutting assembly 122 and the upstream of the third slitting mechanism 133, and is used for conveying the first to-be-slit wide pole pieces to the third slitting mechanism 133, wherein the conveying device has various structures, and in the above example, the conveying device is a traction mechanism.

Specifically, as shown in fig. 1, the drawing mechanism further includes a third drawing mechanism 153, the third drawing mechanism 153 is disposed between the downstream of the second die-cutting assembly 122 and the upstream of the third slitting mechanism 133, and the third drawing mechanism 153 is configured to draw the first to-be-slit wide pole piece strip 2311 from the second die-cutting assembly 122 to the third slitting mechanism 133, so that the third slitting mechanism 133 receives and slits the first to-be-slit wide pole piece.

In order to cut the second wide pole piece strip to be cut 2321, a fourth cutting mechanism 134 is disposed downstream of the third die cutting assembly 123, as shown in fig. 1 and 9, the fourth cutting mechanism 134 is configured to cut the second wide pole piece strip to be cut 2321 along a central line in the width direction of the second wide pole piece strip to be cut 2321, so as to form a fifth narrow pole piece strip 2322 and a sixth narrow pole piece strip 2323. Since the width of the second wide width coating region 232 is twice the width of the second narrow width coating region 212, the specifications of the fifth narrow width pole piece strip 2322 and the sixth narrow width pole piece strip 2323 which are slit and formed are the same as the specification of the second narrow width pole piece strip 2122. Since the first narrow-width pole piece band 2112 and the second narrow-width pole piece band 2122 have the same specification, the specification of the fifth narrow-width pole piece band 2322 and the sixth narrow-width pole piece band 2323 is also the same as the specification of the first narrow-width pole piece band 2112, and thus the same specification of the formed pole piece bands is ensured.

In consideration of the effect of the fourth slitting mechanism 134 receiving and slitting the second to-be-slit broad-width pole pieces, a conveying device is arranged between the downstream of the third die cutting assembly 123 and the upstream of the fourth slitting mechanism 134, and is used for conveying the second to-be-slit broad-width pole pieces to the fourth slitting mechanism 134, wherein the conveying device has various structures, and continues to be connected with the above example, and the conveying device is a traction mechanism.

Specifically, referring to fig. 1, the drawing mechanism further includes a fourth drawing mechanism, the fourth drawing mechanism is disposed between the downstream of the third die-cutting assembly 123 and the upstream of the fourth slitting mechanism 134, and the fourth drawing mechanism is configured to draw the second wide pole piece strip to be slit 2321 to the fourth slitting mechanism 134 through the third die-cutting assembly 123, so that the fourth slitting mechanism 134 receives and slits the second wide pole piece to be slit.

The third narrow-width pole piece strip 2312 and the fourth narrow-width pole piece strip slit by the second slitting mechanism 132 and the fifth narrow-width pole piece strip 2322 and the sixth narrow-width pole piece strip 2323 slit by the third slitting mechanism 133 are respectively wound by the second winding mechanism 142 and the third winding mechanism 143, specifically, as shown in fig. 1, the second winding mechanism 142 and the third winding mechanism 143 are respectively disposed at the downstream of the third slitting mechanism 133 and the fourth slitting mechanism 134, the second winding mechanism 142 is used for winding the third narrow-width pole piece strip 2312 and the fifth narrow-width pole piece strip 2322, and the third winding mechanism 143 is used for winding the fourth narrow-width pole piece strip 2313 and the sixth narrow-width pole piece strip 2323 so as to improve the winding effect of the first winding mechanism 141 and the second winding mechanism 142.

Illustratively, as shown in fig. 2 and 3, the pole piece substrate 200 includes a first narrow width coating region 211, a first wide width coating region 231, a second wide width coating region 232 and a second narrow width coating region 212 arranged in sequence, and a rim leftover 240 respectively reserved on the first narrow width coating region 211 and the second narrow width coating region 212, wherein the width of the first narrow-width coating region 211 and the width of the second narrow-width coating region 212 are both W1, the width of the first wide-width coating region 231 and the width of the second wide-width coating region 232 are both W, and, the width of the first wide coating region 231 is twice the width of the first narrow coating region 211, that is, W is 2W1, the width of each margin area 220 is equal and is L1, the width of the edge margin 240 of the first narrow-width pole piece band 2111 to be slit and the width of the edge margin 240 of the second narrow-width pole piece band 2121 to be slit are both S, and S is 5mm, so that, the total width W1 ═ 2 × S +3 × L1+2 × W1+2 × W of the pole piece substrate 200 can be obtained. If the prior art is used to coat and process a pole piece substrate, as shown in fig. 10 and 11, the prior art pole piece substrate 300 includes three pole piece coating regions 310, two wide pole piece blank regions 320 and two narrow pole piece blank regions 330, wherein the widths of the three pole piece coating areas 310 are equal and are equal to the width of the first wide coating area 231, the width of the wide pole piece blank leaving area 320 is two, the width of the two wide pole piece blank leaving areas 320 is L, the widths of the two narrow pole piece blank leaving areas 330 are equal and are equal to the width of the first narrow coating area 211, while the width of the wide pole piece blanking region 320 is twice the width of the narrow pole piece blanking region 330, from this, it can be seen that the total width W2 of the conventional pole piece substrate 300 is 2 × L1+3 × W +2 × L, by comparing the difference W between the total width W2 of the prior art pole piece substrate 300 and the total width W1 of the pole piece substrate 200 of this example._{Difference (D)}The amount of waste of the pole piece substrate 200 can be reduced by the scheme of the embodiment, that is: w_{Difference (D)}＝3L1-10mm。

Example two

The embodiment of the present application further provides a pole piece forming process, which is applied to the pole piece forming equipment 100 in the first embodiment.

According to the pole piece forming process provided by the embodiment, the pole piece substrate 200 provided by the unwinding mechanism 110 is processed to form the plurality of pole piece belts by adopting the plurality of groups of die cutting assemblies and the plurality of groups of cutting mechanisms, so that the processing efficiency of the pole piece belts is effectively improved, the plurality of winding mechanisms are adopted to wind the plurality of pole piece belts respectively, the winding efficiency of the plurality of pole piece belts is improved, and the production efficiency of the pole piece belts is further improved.

As shown in fig. 12, the pole piece forming process in this embodiment includes the following steps:

and S10, die cutting is carried out on the blank areas of the pole piece base material to form a plurality of pole piece belts to be cut with the pole lugs.

And S20, slitting the pole piece belts to be slit to form a plurality of pole piece belts.

And S30, winding the pole piece belts.

The above-mentioned step has given the process steps of pole piece area production, namely, at first adopt multiunit cross cutting subassembly to carry out the cross cutting to a plurality of whitewashed districts 220 of pole piece base material, at the cross cutting in-process, multiunit cross cutting subassembly carries out the cross cutting according to the cross cutting orbit of utmost point ear profile in the whitewashed district 220 that corresponds in order to form a plurality of pole piece areas of waiting to cut, improve the cross cutting efficiency of pole piece base material, and simultaneously, because the pole piece base material need not to directly carry out the cross cutting process through the process of cutting, the manpower of having reduced between the equipment mechanism is transported, the availability factor of mechanism's equipment has been improved. In addition, a plurality of lugs which are sequentially arranged at intervals along the length direction of the pole piece belts to be split are arranged on the side edges of the pole piece belts to be split; cutting a plurality of to-be-cut pole piece belts formed by die cutting by adopting a plurality of groups of cutting assemblies to form a plurality of pole piece belts, so that the cutting efficiency of the to-be-cut pole piece belts is improved; and finally, the pole piece belts after slitting are wound through a plurality of winding mechanisms, so that the winding efficiency of the pole piece belts is improved.

In addition, before the step of S10, a process step of applying unequal-width coating to the pole piece base material 200 is further included to facilitate the processing operation of the pole piece base material 200, specifically, the pole piece base material 200 is applied at unequal intervals along the width direction of the pole piece base material 200 to form the alternately arranged coated regions and the margin regions 220. The coating area of the pole piece substrate 200 includes a first narrow width coating area 211 and a second narrow width coating area 212 located at two side edges of the pole piece substrate 200, and a first wide width coating area 231 and a second wide width coating area 232 located between the first narrow width coating area 211 and the second narrow width coating area 212.

Step S10 realizes the process of die cutting the pole piece substrate, and in order to improve the efficiency of die cutting the pole piece substrate, as shown in fig. 13, the specific process steps of step S10 include:

and S11, die cutting is carried out on the blank areas adjacent to the first narrow width coating area so that the first narrow width coating area is cut to form a first narrow width pole piece strip to be cut with the pole lugs, and simultaneously die cutting is carried out on the blank areas adjacent to the second narrow width coating area so that the second narrow width coating area is cut to form a second narrow width pole piece strip to be cut with the pole lugs.

And S12, die cutting is carried out on the blank areas on the two sides of the first wide coating area to form a first wide pole piece belt to be cut, wherein the first wide pole piece belt is provided with pole lugs on the two sides.

And S13, die cutting is carried out on the blank areas on the two sides of the second wide coating area to form a second wide pole piece belt to be cut, wherein the two sides of the second wide coating area are provided with pole lugs.

Through the above process steps, multiple times of die cutting of the pole piece base material 200 is realized to form a plurality of pole piece belts to be cut, and through the step S20, the pole piece belts to be cut are cut, so that the cutting efficiency of the pole piece belts to be cut is improved, as shown in fig. 14, the specific process steps of the step S20 for realizing the cutting process include:

and S21, slitting the first narrow-width pole piece strip to be slit to remove leftover materials of the first narrow-width pole piece strip to be slit and form the first narrow-width pole piece strip.

And S22, slitting the second narrow-width pole piece strip to be slit to remove leftover materials of the second narrow-width pole piece strip to be slit and form the second narrow-width pole piece strip.

And S23, slitting the first wide pole piece strip to be slit along the center line of the first wide pole piece strip to be slit in the width direction to form a third narrow pole piece strip and a fourth narrow pole piece strip.

And S24, slitting the second wide pole piece strip to be slit along the central line of the second wide pole piece strip to be slit in the width direction to form a fifth narrow pole piece strip and a sixth narrow pole piece strip.

The cutting of the plurality of pole piece belts to be cut is realized through the specific process steps of the step S20, the plurality of pole piece belts are correspondingly formed, finally, the plurality of pole piece belts are wound through the step S30, and in order to improve the winding efficiency of the pole piece belts, as shown in fig. 15, the specific steps of the step S30 of winding the plurality of pole piece belts include:

and S31, winding the first narrow pole piece belt and the second narrow pole piece belt to a first winding mechanism.

And S32, winding the third narrow pole piece belt and the fifth narrow pole piece belt to a second winding mechanism.

And S33, winding the fourth narrow pole piece belt and the sixth narrow pole piece belt to a third winding mechanism.

The specific process steps in the step 30 realize the rolling of the plurality of pole piece belts, and improve the rolling efficiency of the plurality of pole piece belts.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.