CN214477588U

CN214477588U - Lamination machine

Info

Publication number: CN214477588U
Application number: CN202120368252.5U
Authority: CN
Inventors: 不公告发明人
Original assignee: Wuxi Lead Intelligent Equipment Co Ltd
Current assignee: Wuxi Lead Intelligent Equipment Co Ltd
Priority date: 2021-02-09
Filing date: 2021-02-09
Publication date: 2021-10-22
Anticipated expiration: 2031-02-09

Abstract

The utility model relates to a lamination machine, including heating device, first sheet stock device, second sheet stock device and first set composite. By adopting the laminating machine, the adhesives on two sides of the first composite material belt are firstly heated and melted by the heating device, then the first sheet material device and the second sheet material device respectively attach the first sheet material and the second sheet material to two opposite sides of the first composite material belt, and then the second composite material belt is formed by processing through the first compounding device. Because the adhesive is melted, the bonding strength of the first sheet material and the second sheet material with the first composite material belt can be ensured, the first sheet material and the second sheet material are prevented from being displaced after being bonded with the first composite material belt, and the quality of the battery core is improved.

Description

Lamination machine

Technical Field

The utility model relates to a lithium cell preparation technical field especially relates to a lamination machine.

Background

The preparation process of the lithium battery comprises a lamination step, wherein the conventional lamination step is generally that a strip-shaped pole piece is cut off to form a sheet material, then the sheet material is attached with a diaphragm to form a composite material belt, and then the composite material belt is folded through a lamination device, so that the lamination step is completed. As shown in fig. 1, in the prior art, a composite material belt formed by sheet stock and a diaphragm is formed by directly bonding the sheet stock to the diaphragm and then compounding the sheet stock and the diaphragm through an oven and a PET (Polyester) film by heating and pressurizing, so that the PET film is consumed, and the cost is high.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a lamination machine which does not consume a PET film and reduces the cost, aiming at the problem of high cost of the conventional battery cell preparation.

A lamination machine comprises

The heating device is used for heating a first composite material belt, the first composite material belt comprises a first diaphragm, a first electrode material belt and a second diaphragm which are arranged in a stacked mode, and the first electrode material belt is provided with a plurality of creases which are arranged at intervals along the length direction of the first electrode material belt and extend along the width direction of the first electrode material belt;

the first sheet material device is arranged at the downstream of the heating device and is used for providing a first sheet material to the side surface, away from the first electrode material belt, of the first diaphragm after being heated;

a second sheet material device arranged at the downstream of the heating device, wherein the second sheet material device is used for providing a second sheet material for the side surface of the heated second diaphragm, which is far away from the first electrode material belt; and

the first compounding device comprises a heating mechanism and a rolling mechanism, wherein the heating mechanism is arranged at the downstream of the first sheet material device and the second sheet material device and is used for heating the first compound material belt adhered with the first sheet material and the second sheet material, and the rolling mechanism is arranged at the downstream of the heating mechanism and is used for rolling the first compound material belt adhered with the first sheet material and the second sheet material so as to form the second compound material belt.

By adopting the laminating machine, the adhesives on two sides of the first composite material belt are firstly heated and melted by the heating device, then the first sheet material device and the second sheet material device respectively attach the first sheet material and the second sheet material to two opposite sides of the first composite material belt, and then the second composite material belt is formed by processing through the first compounding device. Because the adhesive is melted, the bonding strength of the first sheet material and the second sheet material with the first composite material belt can be ensured, the first sheet material and the second sheet material are prevented from being displaced after being bonded with the first composite material belt, and the quality of the battery core is improved.

In addition, heat and roll-in first sheet stock, first compound material area and second sheet stock in proper order through heating mechanism and rolling mechanism, compare in the compound mode of PET membrane and oven, need not to set up the PET membrane, reduced the PET membrane and set up the cost of PET membrane unwinding mechanism and PET membrane winding mechanism, the cost of manufacture is lower, need not to set up longer oven moreover, has improved compound efficiency, production efficiency is high.

In one embodiment, the lamination machine further comprises a second compounding device, the second compounding device comprising:

the first electrode material belt unwinding mechanism is used for releasing the first electrode material belt;

the folding line mechanism is arranged at the downstream of the first electrode material belt unreeling mechanism and is used for forming a plurality of folding lines on the first electrode material belt in the path; and

the first compounding mechanism is arranged between the crease mechanism and the heating device and used for compounding a first diaphragm and a second diaphragm on two opposite sides of the first electrode material belt and forming the first compound material belt.

In one embodiment, the creasing mechanism comprises a laser cutting head or knife.

In one embodiment, the creases are through holes sequentially arranged at intervals along the width direction of the first electrode material strip and penetrating through the first electrode material strip along the thickness direction of the first electrode material strip.

In one embodiment, the through holes include one or more of circular holes, rectangular holes, or strip-shaped holes.

In one embodiment, the fold is a folding area extending lengthwise along the width direction of the first electrode material strip, and the thickness of the folding area of the first electrode material strip is smaller than the thickness of the other positions.

In one embodiment, said first laminating apparatus further comprises a feeding mechanism disposed upstream of said heating mechanism for laminating said first sheet material and said second sheet material to opposite sides of said first composite tape.

In one embodiment, a folding sheet is formed between two adjacent folds on the first electrode material belt;

the second composite material belt comprises a plurality of first laminated assemblies and a plurality of second laminated assemblies, the first laminated assemblies and the second laminated assemblies are alternately connected, the first laminated assemblies comprise the first sheet material, the first membrane, the folding sheet and the second membrane which are sequentially laminated, and the second laminated assemblies comprise the second sheet material, the second membrane, the folding sheet and the first membrane which are sequentially laminated;

the laminating machine further comprises a laminating device, wherein the laminating device is arranged at the downstream of the rolling mechanism and used for carrying out folding treatment on the second composite material belt along the crease so as to alternately laminate the plurality of first laminated assemblies and the plurality of second laminated assemblies to form the battery cell.

the second composite material belt comprises a plurality of third laminated assemblies and a plurality of fourth laminated assemblies, the third laminated assemblies and the fourth laminated assemblies are alternately connected, the third laminated assemblies comprise the first sheet material, the first membrane, the folding sheet, the second membrane and the second sheet material which are sequentially laminated, and the fourth laminated assemblies comprise the first membrane, the folding sheet and the second membrane which are sequentially laminated;

the laminating machine further comprises a laminating device, wherein the laminating device is arranged at the downstream of the rolling mechanism and used for carrying out folding treatment on the second composite material belt along the crease so as to alternately laminate the plurality of third laminated assemblies and the plurality of fourth laminated assemblies to form the battery cell.

In one embodiment, the laminating device comprises a laminating table and a clamping jaw, the laminating table is arranged at the downstream of the rolling mechanism and can move back and forth along the vertical direction, and the clamping jaw moves back and forth between the discharge end of the rolling mechanism and the laminating table and is used for clamping the second composite material belt and folding and placing the second composite material belt on the laminating table.

Drawings

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

FIG. 1 is a schematic diagram of the principle of PET film and oven composite pole piece and diaphragm in the prior art;

fig. 2 is a schematic structural diagram of a second composite device according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of the first electrode material strip processed by the creasing mechanism in the second laminating device shown in fig. 2;

fig. 4 is a schematic structural diagram of a lamination machine according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a lamination machine provided in embodiment 1 of the present invention;

fig. 6 is a schematic structural diagram of a laminating machine provided in embodiment 2 of the present invention;

fig. 7 is a schematic structural diagram of a lamination stacking machine according to embodiment 3 of the present invention in a state;

FIG. 8 is a schematic illustration of the laminator of FIG. 7 in another configuration;

fig. 9 is a schematic view of the laminator of fig. 7 in a further state.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

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

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

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

In order to facilitate understanding of the technical solution of the present invention, the prior art is described herein with reference to fig. 1: the lamination machine that adopts PET membrane and oven at present includes pole piece unwinding mechanism 1, PET membrane unwinding mechanism 2, PET membrane winding mechanism 3 and oven subassembly 4, realize the complex of sheet stock and diaphragm 6, set up oven subassembly 4 around being equipped with PET membrane 5 in the both sides of diaphragm 6 promptly, PET membrane 5 passes through PET membrane unwinding mechanism 1 release, and by the rolling of PET membrane winding mechanism 2, in order to remove along with diaphragm 6 and pole piece, and compress tightly the pole piece on diaphragm 6 at the removal in-process, avoid the pole piece skew, oven subassembly 4 heats the pressure to diaphragm 6 and pole piece between PET membrane 5 and the two-layer PET membrane 5, thereby realize the complex of pole piece and diaphragm 6.

Adopt the mode of PET membrane and oven to compound the pole piece on diaphragm 6, need consume PET membrane 5, also need set up PET membrane unwinding mechanism 2 and unreel and set up the rolling of PET membrane winding mechanism 3 simultaneously, material cost and equipment cost are higher, and is too big, and in order to reach suitable compound temperature when oven subassembly 4 heats the pressurization, pole piece and diaphragm will be guaranteed to heat longer time in the oven, consequently need select longer oven, lead to the cost of oven higher, and occupation space is big, low in production efficiency.

As shown in fig. 2, an embodiment of the present invention provides a second composite device 10, which includes a first electrode material tape unwinding mechanism 11, a folding line mechanism 12 and a first composite mechanism 13, wherein the first electrode material tape unwinding mechanism 11 is used to release a first electrode material tape 201, the folding line mechanism 12 is disposed at a downstream of the first electrode material tape unwinding mechanism 11, and the first composite mechanism 13 is disposed at a downstream of the folding line mechanism 12.

The folding mechanism 12 is used for forming a plurality of folds on the first electrode material tape 201, the folds being arranged at intervals along the length direction of the first electrode material tape 201 and extending along the width direction of the first electrode material tape 201, and the first combining mechanism 13 is used for combining the first membrane 202 and the second membrane 203 on two opposite sides of the first electrode material tape 201 and forming the first composite material tape 200.

The first electrode material tape 201 is a strip-shaped electrode sheet.

By providing the second composite device 10, the folding mechanism 12 forms a plurality of folds on the first electrode material tape 201, the first membrane 202 and the second membrane 203 are attached to two sides of the first electrode material tape 201 to form the first composite material tape 200, and the first composite material tape 200 can be directly folded along the folds in the process of folding the first composite material tape 200. Compared with the prior art that the pole pieces are cut into the sheet materials and then laminated, the second laminating device 10 directly uses the strip-shaped pole pieces without cutting, and the efficiency of subsequent lamination is effectively improved. Meanwhile, more burrs generated when the pole piece is cut can be avoided, and the quality of the battery is improved.

It should be noted that the second composite apparatus 10 is used for forming the first composite material tape 200, in this embodiment, the first electrode material tape 201 in the first composite material tape 200 has a plurality of folds, so as to facilitate subsequent folding, and when the first composite material tape 200 is folded, the pole pieces may be laid on the first composite material tape 200 and then folded to form the battery cells according to actual process selection, which is not described in detail in this embodiment.

It should be noted that the stiffness of the pole pieces is higher than the stiffness of the first diaphragm 202 and the second diaphragm 203, the pole pieces in sheet form are folded in the conventional lamination method, but the pole pieces in belt form are conveniently folded in the embodiment, so that the first electrode material strip 201, i.e. the belt-shaped pole pieces, are folded.

In some embodiments, the second compounding device 10 further includes a first diaphragm unwinding mechanism 14, the first diaphragm unwinding mechanism 14 being disposed upstream of the compounding mechanism for releasing the first diaphragm 202. Further, the second composite device 10 further includes a second membrane unwinding mechanism 15, and the second membrane unwinding mechanism 15 is disposed upstream of the composite mechanism and is configured to release the second membrane 203.

In some embodiments, creasing mechanism 12 includes a laser cutting head or knife that is used to form a crease across the width of the strip-like pole piece, with multiple creases spaced evenly along its length.

As shown in fig. 3 a, b, and c, the strip-shaped pole piece may be folded by forming through holes on the pole piece by a laser cutting head or a cutter, the through holes are sequentially spaced along the width direction of the first electrode tape 201 and penetrate through the first electrode tape 201 along the thickness direction thereof, and the through holes may be one or more of circular holes, rectangular holes, and strip-shaped holes.

Of course, as shown in a diagram d in fig. 3, the fold is a folding region extending lengthwise along the width direction of the first electrode material tape 201, and a part of the carbon powder in the dotted region is removed by laser, so that the carbon powder layer in the region is less than the carbon powder layer in other positions, that is, the thickness of the folding region of the first electrode material tape 201 is less than the thickness of the other positions, which results in the strength of the region being weakened, and facilitates folding.

In some embodiments, the first and

second membranes

202 and 203 have adhesive on their surfaces on opposite sides, and after the first and

second membranes

202 and 203 are initially attached to the strip-shaped pole pieces in the first composite tape 200, the adhesive is melted by the heat and pressure of the first composite mechanism 13, i.e., the composite process, and the first and

second membranes

202 and 203 are bonded to the strip-shaped pole pieces to form the first composite tape 200. Meanwhile, when the subsequent folding is performed, the adhesive on the side surfaces of the first diaphragm 202 and the second diaphragm 203, which are far away from the strip-shaped pole piece, can ensure the adhesion and fixation during the folding.

In some embodiments, the first composite mechanism 13 includes a first heating assembly 131 and a first rolling assembly 132, the first heating assembly 131 is configured to heat the first separator 202, the first electrode material tape 201, and the second separator 203, so that the adhesive on the surfaces of the first separator 202 and the second separator 203 is melted, and the first rolling assembly 132 is configured to roll the first separator 202, the first electrode material tape 201, and the second separator 203, so that the three are adhered together to form the first composite material tape 200.

Further, the first compound mechanism 13 further includes a feeding assembly 133, the feeding assembly 133 is disposed downstream of the folding mechanism 12 and upstream of the first heating assembly 131, and is configured to guide the first membrane 202 released by the first membrane unwinding mechanism 14, the second membrane 203 released by the second membrane unwinding mechanism 15, and the first electrode material tape 201 released by the first electrode material tape unwinding mechanism 11, so that the first membrane 202 and the second membrane 203 are attached to two opposite sides of the first electrode material tape 201.

In practical applications, the feeding assembly 133 guides the first separator 202, the first electrode tape 201, and the second separator 203 through two feeding rollers, the first heating assembly 131 can heat the first separator 202, the first electrode tape 201, and the second separator 203 through a heating block, and the first rolling assembly 132 can clamp the outer sides of the first separator 202 and the second separator 203 through two pressing rollers, so as to roll the first separator 202, the first electrode tape 201, and the second separator 203.

Referring to fig. 4, the present invention further provides a laminating machine 100, which includes a heating device 41, a first sheet material device 20 and a second sheet material device 30, wherein the heating device 41 is used for heating the first composite material belt 200, the first sheet material device 20 and the second sheet material device 30 are both disposed at the downstream of the heating device 41, the first sheet material device 20 is used for providing a first sheet material 301 to a side surface of the heated first composite material belt 200, and the second sheet material device 30 is used for providing a second sheet material 302 to another side surface of the heated first composite material belt 200.

Further, the laminating machine further comprises a first compounding device 42, the first compounding device 42 comprises a heating mechanism 421 and a rolling mechanism 422, the heating mechanism 421 is arranged at the downstream of the first sheet device 20 and the second sheet device 30 and is used for heating the first compound material belt 200 attached with the first sheet 301 and the second sheet 302, and the rolling mechanism 422 is arranged at the downstream of the heating mechanism 421 and is used for rolling the first compound material belt 200 attached with the first sheet 301 and the second sheet 302 so as to form the second compound material belt.

The first composite tape 200 is formed by combining the second combining device 10 in the foregoing embodiment, so that the first composite tape 200 includes a first membrane 202, a first electrode tape 201, and a second membrane 203, which are stacked.

Specifically, the first sheet material device 20 is used to provide a first sheet material 301 to a side surface of the heated first membrane 202 facing away from the first electrode material tape 201, and the second sheet material device 30 is used to provide a second sheet material 302 to a side surface of the heated second membrane 203 facing away from the first electrode material tape 201.

Since both side surfaces of the first and

second membranes

202 and 203 have adhesive, both side surfaces of the first composite tape 200 also have adhesive. By using the laminator, the adhesive on both sides of the first composite tape 200 is melted by heating by the heating device 41, and then the first sheet device 20 and the second sheet device 30 respectively attach the first sheet 301 and the second sheet 302 to the opposite sides of the first composite tape 200, followed by processing by the first laminating device 42 to form the second composite tape. Because the adhesive is melted, the strength of the first sheet material 301 and the second sheet material 302 attached to the first composite material belt 200 can be ensured, the first sheet material 301 and the second sheet material 302 are prevented from being displaced after being attached to the first composite material belt 200, and the quality of the battery core is improved.

In addition, heat and roll-in first sheet stock 301, first compound material area 200 and second sheet stock 302 in proper order through heating mechanism 421 and rolling mechanism 422, compare in the compound mode of PET membrane and oven, need not to set up the PET membrane, reduced the PET membrane and set up the cost of PET membrane unwinding mechanism and PET membrane winding mechanism, the cost of manufacture is lower, need not to set up longer oven moreover, has improved compound efficiency, production efficiency is high.

It should be noted that, when the first combining mechanism 13 in the second combining device 10 combines the first membrane 202, the first electrode material tape 201 and the second membrane 203, the first heating assembly 131 heats the first membrane, but the combined first composite material tape 200 cools during the conveying process, so that the heating device 41 is disposed upstream of the first sheet device 20 and the second sheet device 30 to heat the first composite material tape 200.

Similarly, since the first composite tape 200 is cooled during the conveying process, the heating mechanism 421 is disposed upstream of the rolling mechanism 422 to heat the first sheet 301 and the second sheet 302 before rolling, so that the first composite tape 200 and the second sheet 301 are tightly attached.

In addition, the adhesive on the surfaces of the two sides of the first diaphragm 202 and the second diaphragm 203 is usually a heat-sensitive adhesive, and the heating device 41 heats the first composite material belt 200 to activate the activity of the heat-sensitive adhesive, so as to avoid the temperature reduction during the conveying process and influence on the adhesive force of the heat-sensitive adhesive, ensure that the first sheet 301 and the second sheet 302 are tightly and stably attached to the two sides of the first composite material belt 200, and avoid the displacement of the first sheet 301 and the second sheet 302. The heating mechanism 421 in the first combining device 42 heats the first composite material tape 200 to which the first sheet 301 and the second sheet 302 are attached, so that the activity of the thermal adhesive can be maintained, and the influence of the temperature reduction during the conveying process on the adhesive force of the thermal adhesive can be avoided, so that the first sheet 301 and the second sheet 302 are tightly attached to the first composite material tape 200 under the pressure of the rolling mechanism 422.

In some embodiments, the heating device 41 includes two heating blocks, and the first composite tape 200 passes between the two heating blocks, and the two heating blocks are used for heating the first composite tape 200. In other embodiments, the heating device 41 may be a heating roller, and is not limited herein. In the same way, the heating mechanism 421 may be a heating block or a heating roller.

Meanwhile, if the bonding strength of the first sheet 301 and the second sheet 302 to the first composite tape is not increased by the previous heating, the first sheet 301 and the second sheet 302 are easily displaced during the subsequent conveyance or rolling.

In some embodiments, the first sheet device 20 includes a second electrode material tape unwinding mechanism 21 and a first cutting mechanism 22, the second electrode material tape unwinding mechanism 21 is configured to release the second electrode material tape 400, the first cutting mechanism 22 is located downstream of the second electrode material tape unwinding mechanism 21, and the first cutting mechanism 22 is configured to cut the second electrode material tape 400 to form the first sheet 301.

Further, the second sheet material device 30 includes a third electrode material tape unwinding mechanism 31 and a second cutting mechanism 32, the third electrode material tape unwinding mechanism 31 is configured to release the third electrode material tape 500, the second cutting mechanism 32 is located downstream of the third electrode material tape unwinding mechanism 31, and the second cutting mechanism 32 is configured to cut the third electrode material tape 500 to form the second sheet material 302.

It should be noted that, the second electrode material tape 400 and the third electrode material tape 500 are the same as the first electrode material tape 201 and are both strip-shaped pole pieces, and after the first cutting mechanism 22 and the second cutting mechanism 32 cut the second electrode material tape 400 and the third electrode material tape 500 to form the first sheet 301 and the second sheet 302, respectively, the first sheet 301 and the second sheet 302 can be preliminarily attached to the first diaphragm 202 and the second diaphragm 203, respectively. Or other mechanisms can be added to preliminarily adhere the first sheet 301 and the second sheet 302 to the first diaphragm 202 and the second diaphragm 203, respectively, without limitation.

In some embodiments, the first compounding device 42 further includes a feeding mechanism 423, the feeding mechanism 423 being disposed upstream of the heating mechanism 421, the feeding mechanism 423 being configured to adhere the first sheet 301 and the second sheet 302 to opposite sides of the first compound tape.

Specifically, the feeding mechanism 423 includes two feeding rollers, and the two feeding rollers are respectively used for adhering the first sheet 301 and the second sheet 302 to two opposite sides of the first composite tape 200.

Pan feeding mechanism 423, heating mechanism 421 and rolling mechanism 422 are integrated to be first set composite 42 for the compactness of structure is more, compares in the compound mode of PET membrane and oven, need not to set up PET membrane unwinding mechanism, PET membrane winding mechanism and longer oven, and occupation space is littleer.

Before further description, it should be noted that, after the folding mechanism 12 in the second composite device 10 forms a plurality of folds on the first electrode material strip 201, a folded sheet is formed between two adjacent folds on the first electrode material strip 201.

The first sheet material 301 and the second sheet material 302 are both pole pieces, and when the first electrode material tape 201 is a negative electrode, the first sheet material 301 and the second sheet material 302 are both positive pole pieces, and when the first electrode material tape 201 is a positive electrode, the first sheet material 301 and the second sheet material 302 are negative pole pieces. And the first diaphragm 202 and the second diaphragm 203 may be identical.

In this manner, when the cell is folded, the first sheet 301, the first separator 202, the folded sheet, the second separator 203, the second sheet 302, the second separator 203, the folded sheet, and the first separator 202 are sequentially stacked in a predetermined number. Specifically, the first sheet 301 (the second sheet 302) is a pole piece and is one of a positive electrode and a negative electrode, the first electrode material tape 201 is the other of the positive electrode and the negative electrode, and after the first sheet 301, the second sheet 302 and the first composite material tape 200 are compounded into the second composite material tape and repeatedly folded, a battery core in which a diaphragm, the positive pole piece, the diaphragm and the negative pole piece are sequentially and circularly laminated is formed.

Referring to fig. 5, in embodiment 1, the first sheet 301 and the second sheet 302 are alternately arranged along the length direction of the first composite tape 200, and the first sheet 301 and the second sheet 302 adjacent to each other along the length direction of the first composite tape 200 correspond to two adjacent folded sheets, respectively.

It should be explained that the plurality of folds on the first electrode material strip 201 are uniformly spaced along the length direction of the first electrode material strip 201, and each of the first sheet 301 and each of the second sheet 302 correspond to the folded sheet, so that all of the first sheet 301 and all of the second sheet 302 are uniformly spaced along the length direction of the first electrode material strip 201, i.e. along the length direction of the first composite material strip 200.

In practice, the distance between two adjacent first panels 301 along the length of the first composite tape 200 is greater than the width of the second panel 302, and the distance between two adjacent second panels 302 along the length of the first composite tape 200 is greater than the width of the first panels 301.

In fig. 5, the width direction of the first sheet 301 and the second sheet 302 is the longitudinal direction of the first composite tape 200.

In this embodiment, the second composite tape 303 includes a plurality of first laminated assemblies 3031 and second laminated assemblies 3032, the first laminated assemblies 3031 and the second laminated assemblies 3032 are alternately connected, the first laminated assemblies 3031 include a first sheet 301, a first membrane 202, a folded sheet and a second membrane 203 which are sequentially laminated, and the second laminated assembly 3032 includes a first membrane 202, a folded sheet, a second membrane 203 and a second sheet 302 which are sequentially laminated.

In this embodiment, the laminating machine further includes a first laminating device 50, and the first laminating device 50 is disposed downstream of the rolling mechanism 422 and is used for performing a folding process on the second composite material tape 303 along the fold line to alternately laminate the plurality of first laminating assemblies 3031 and the plurality of second laminating assemblies 3032 to form the battery cell.

Further, the first lamination device 50 comprises a lamination station 51, and the second composite tape 303 is conveyed from top to bottom in a vertical direction and folded on the lamination station 51.

It should be noted that, in this embodiment, the second composite material strip 303 may be folded by using a blowing structure or a pushing support in cooperation with gravity, or the second composite material strip 303 may be folded by directly relying on gravity.

When the air blowing structure is adopted, air blowing structures are arranged on two sides of the second composite material strip 303 and are located above the lamination table 51, the air blowing structures on the two sides alternately blow air towards the second composite material strip 303 in the conveying process of the second composite material strip 303, and the air blowing structure blows air to bend the second composite material strip 303 due to the fact that the first electrode material strip 201 is provided with the crease, and therefore the second composite material strip 303 is enabled to be folded on the lamination table 51.

When the material pushing supports are adopted, the material pushing supports are arranged on two sides of the second composite material belt 303 and are located above the lamination table 51, the material pushing supports on the two sides are arranged in a staggered mode in the vertical direction, the material pushing supports on the two sides can be close to each other to apply external force in opposite directions to two adjacent folding pieces, the adjacent folding pieces are bent, and therefore the second composite material belt 303 is enabled to be folded on the lamination table 51.

When the gravity is directly relied on, because the first electrode material belt 201 has a crease, and the second composite material belt 303 is conveyed downwards to the lamination table 51 along the vertical direction, the lamination table 51 is provided with two baffles, under the action of gravity, the first electrode material belt 201 is limited by the two baffles, and can be bent and folded at the crease, so that the folding of the second composite material belt 303 is realized.

Referring to fig. 6, in embodiment 2, the second composite tape 303 includes a plurality of first laminated assemblies 3031 and second laminated assemblies 3032, the first laminated assemblies 3031 and the second laminated assemblies 3032 are alternately connected, the first laminated assemblies 3031 include a first sheet 301, a first membrane 202, a folded sheet and a second membrane 203 which are sequentially laminated, and the second laminated assembly 3032 includes a first membrane 202, a folded sheet, a second membrane 203 and a second sheet 302 which are sequentially laminated.

In this embodiment, the laminating machine further includes a second laminating device 60, and the second laminating device 60 is disposed downstream of the rolling mechanism 422 and is used for performing a folding process on the second composite material tape 303 along the crease line so as to alternately laminate the plurality of first laminating assemblies 3031 and the plurality of second laminating assemblies 3032 to form the battery cell.

It will be appreciated that the function of the second lamination arrangement 60 in this embodiment is the same as the function of the first lamination arrangement 50 in embodiment 1.

Further, the second laminating device 60 includes a laminating table 61 and a clamping jaw 62, the laminating table 61 is disposed downstream of the rolling mechanism 422, the laminating table 61 is vertically movable in a reciprocating manner, and the clamping jaw 62 is movable in a reciprocating manner between the discharging end of the rolling mechanism 422 and the laminating table 61 for clamping the second composite tape 303 and folding and placing the second composite tape 303 on the laminating table 61.

One embodiment is illustrated: initially, the second sheet material device 30 first sets the second sheet material 302 at the head end of the first composite material tape 200, then the first sheet material device 20 places the first sheet material 301 on the first composite material tape 200, and then sequentially places the second sheet material 302 and the first sheet material 301, and sequentially passes through the feeding mechanism 423, the heating mechanism 421 and the rolling mechanism 422, so as to form the second composite material tape 303 by compounding.

In other words, the second laminated assembly 3032 in the second composite tape 303 of this embodiment is located at the head end, and the second composite tape 303 is formed by alternately connecting a plurality of second laminated assemblies 3032 and a plurality of first laminated assemblies 3031.

The clamping jaw 62 grabs and translates the second composite tape 303 at the discharge end of the rolling mechanism 422 onto the lamination table 61, while the first membrane 202 of the first composite tape 200 contacts the lamination table 61, i.e. the first-end second laminated assembly 3032 contacts the lamination table 61, the lamination table 61 descends, the clamping jaw 62 returns to the discharge end of the rolling mechanism 422 to continuously grab the second laminated assembly 3032, then the clamping jaw 62 translates towards the lamination table 61 to move the grabbed second laminated assembly 3032 onto the lamination table 61, as the lamination table 61 descends, the first laminated assembly 3031 adjacent to the first-end second laminated assembly 3032 is also descended, when the clamping jaw 62 moves the grabbed second laminated assembly 3032 onto the lamination table 61, the first laminated assembly 3031 adjacent to the first-end second laminated assembly 3032 is covered on the first-end second laminated assembly 3032, and the grabbed second laminated assembly 3032 is also covered on the first laminated assembly 3031, thereby achieving the folding.

It should be explained that the gripping jaw 62 grips one stacked component apart, that is, one stacked component is spaced between the stacked component gripped at a time and the stacked component gripped last time. When the second stacked assembly 3032 is grasped as described above, since the first stacked assembly 3031 and the second stacked assembly 3032 are alternately connected, when the clamping jaws 62 grasp the second stacked assembly 3032 right above the previous second stacked assembly 3032, the first stacked assembly 3031 between the two second stacked assemblies 3032 is folded.

Referring to fig. 7-9, in embodiment 3, the second composite tape 304 includes a plurality of third stacked assemblies 3041 and a plurality of fourth stacked assemblies 3042, the third stacked assemblies 3041 and the fourth stacked assemblies 3042 are alternately connected, the third stacked assemblies 3041 include a first sheet 301, a first membrane 202, a folded sheet, a second membrane 203 and a second sheet 302, which are sequentially stacked, and the fourth stacked assemblies 3042 include a first membrane 202, a folded sheet and a second membrane 203, which are sequentially stacked.

In this embodiment, the laminating machine further includes a third laminating device 70, where the third laminating device 70 is disposed downstream of the rolling mechanism 422, and is configured to perform a folding process on the second composite material tape 304 along the fold, so as to alternately laminate the plurality of third laminating assemblies 3041 and the plurality of fourth laminating assemblies 3042 to form the battery cell.

Further, the third laminating device 70 includes a laminating table 71 and a clamping jaw 72, the laminating table 71 is disposed downstream of the rolling mechanism 422, the laminating table 71 is vertically movable in a reciprocating manner, and the clamping jaw 72 is movable in a reciprocating manner between the discharging end of the rolling mechanism 422 and the laminating table 71 for clamping the second composite material tape 304 and folding and placing the second composite material tape 304 on the laminating table 71.

In practical application, the third laminating device 70 further includes a pressing plate 73, where the pressing plate 73 is movable in a reciprocating manner in a vertical direction, and is configured to press the battery cell on the laminating table 71, so as to compress the first sheet 301, the first composite material tape 200, the second sheet 302, and the first composite material tape 200, which are stacked together, and ensure that the structures of the layers in the battery cell are tightly attached to each other.

Specifically, the third lamination device 70 further includes a pressing knife 74, and the pressing knife 74 is movable along with the lamination table 71 in the vertical direction and is movable relative to the lamination table 71 for pressing the battery cell.

It should be noted that, after the clamping jaw 72 clamps the second composite material tape 304 and folds and places the second composite material tape 304 on the lamination table 71, the pressing plate 73 presses the battery cell, the clamping jaw 72 is removed, the pressing knife 74 presses the battery cell, and the pressing plate 73 is removed, so that the battery cell is prevented from being loosened or displaced in the lamination process, and the precision of lamination is prevented from being affected.

In addition, the second lamination device 60 in embodiment 2 may also be provided with a pressing plate and a pressing knife for pressing the battery cell.

Referring to fig. 7-9, a preferred embodiment is illustrated: initially, a second sheet 302 is placed at the head end (corresponding to the position of the first folded sheet) of the first composite tape 200, then the first sheet 301 and the second sheet 302 are placed on the first composite tape 200 corresponding to the third folded sheet, then the first sheet 301 and the second sheet 302 are placed corresponding to the fifth folded sheet, and by repeating the steps of placing the first sheet 301 and the second sheet 302 every other folded sheet, and the first sheet 301 and the second sheet 302 placed every time correspond to the same folded sheet, and after the first sheet 301 and the second sheet 302 are placed on the first composite tape 200, the second composite tape 304 is formed by sequentially processing through the feeding mechanism 423, the heating mechanism 421 and the rolling mechanism 422. In other words, in this embodiment, the head end is the third laminate assembly 3041 with only the second sheet material 302 when folded.

In other embodiments, it is also possible that the third laminate assembly 3041 of the second composite strip 304 is at the head end when folded, or the fourth laminate assembly 3042 is at the head end. The folding is performed in the same manner in the three embodiments, which are described herein in connection with fig. 7-9, taking as an example the third laminate assembly 3041 with only the second sheet material 302 at the head end when folded:

before grabbing, the pressing plate 73 moves to avoid the position, the clamping jaw 72 grabs and translates the second composite tape 304 at the discharge end of the rolling mechanism 422 onto the lamination table 71, at this time, the third lamination assembly 3041 at the head end of the first composite tape 200, which only carries the second sheet material 302, contacts with the lamination table 71, the pressing plate 73 presses down to press the third lamination assembly 3041, then the clamping jaw 72 withdraws and returns to the discharge end of the rolling mechanism 422 to continuously grab the second third lamination assembly 3041, the pressing knife 74 presses against the third lamination assembly 3041, and after the pressing knife 74 presses, the pressing plate 73 is removed.

Next, the clamping jaw 72 grabs the second third stacked assembly 3041 and translates to the stacking table 71, the pressing knife 74 keeps pressing and descends along with the stacking table 71, the third stacked assembly 3041 at the head end of the second composite material tape 304 descends along with the pressing knife, when the clamping jaw 72 grabs the second third stacked assembly 3041 and translates to the stacking table 71, the fourth stacked assembly 3042 adjacent to the third stacked assembly 3041 at the head end covers the third stacked assembly 3041 at the head end, and the second third stacked assembly 3041 at the head end covers the fourth stacked assembly 3042, so as to realize folding.

After folding, the pressing plate 73 presses again, and then the clamping jaw 72 is withdrawn to continue to grab the following third laminated assembly 3041, and then the pressing knife 74 is withdrawn to press against another third laminated assembly 3041 again and descend with the laminating table 71.

It should be explained that the gripping jaw 72 grips the stacked component at an interval, that is, the stacked component gripped at a time is spaced from the stacked component gripped last time by one stacked component. When the third stacked assembly 3041 is grabbed as described above, since the third stacked assembly 3041 and the fourth stacked assembly 3042 are alternately connected, when the clamping jaw 72 grabs the second third stacked assembly 3041 right above the previous third stacked assembly 3041, the fourth stacked assembly 3042 between the two third stacked assemblies 3041 is folded.

It will be appreciated that the action of the clamping jaws 72 and the lamination station 71 in the third lamination device 70 of this embodiment is the same as the action of the clamping jaws 62 and the lamination station 61 in the second lamination device 60 of embodiment 2.

In the above embodiments, it should be summarized that the first sheet 301, the second sheet 302, and the folded sheet in the above embodiments are all pole pieces, and the first separator 202 and the second separator 203 are all separators, so that the folded battery cell is actually a structure formed by laminating pole pieces and separators multiple times.

Meanwhile, in the embodiments 1 and 2, the second composite tape has the same structure, so the same reference numerals are used for easy understanding, and the second composite tape in the embodiment 3 has a different structure from those in the embodiments 1 and 2, so different reference numerals are used for easy distinction. Moreover, the preparation of two second composite tapes can be achieved by modifying the sequence of the first 20 and second 30 sheet means, which the skilled person can unambiguously determine from the description in example 3.

Furthermore, it is understood that the first lamination device 50, the second lamination device 60 and the third lamination device 70 are all lamination devices for performing a folding process on the second composite material tape, the first lamination device 50 and the second lamination device 60 can be used for alternately laminating a plurality of third lamination assemblies and a plurality of fourth lamination assemblies to form a cell, and the third lamination device 70 can also be used for alternately laminating a plurality of first lamination assemblies and a plurality of second lamination assemblies to form a cell.

In one embodiment, the first electrode tape 201 is a negative electrode, and the first sheet 301 and the second sheet 302 are positive electrode sheets. In another embodiment, the first electrode tape 201 is a positive electrode, and the first sheet 301 and the second sheet 302 are negative electrode sheets.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A laminating machine is characterized by comprising

2. The lamination machine according to claim 1, further comprising a second compounding device, the second compounding device comprising:

3. The laminating machine of claim 2, wherein the creasing mechanism includes a laser cutting head or knife.

4. The laminating machine according to claim 1, wherein the folds are through holes which are sequentially arranged at intervals along the width direction of the first electrode material strip and penetrate through the first electrode material strip along the thickness direction of the first electrode material strip.

5. A lamination machine according to claim 4, wherein the through-holes comprise one or more of circular, rectangular or strip-shaped holes.

6. The laminating machine of claim 2, wherein said fold is a folded region extending lengthwise in a width direction of said first strip of electrode material, said folded region of said first strip of electrode material having a thickness less than a thickness elsewhere.

7. The laminating machine of claim 1, wherein said first combining device further includes a feed mechanism disposed upstream of said heating mechanism for engaging said first sheet and said second sheet on opposite sides of said first composite tape.

8. The laminating machine of claim 1, wherein a folded sheet is formed between two adjacent folds on the first electrode strip;

9. The laminating machine of claim 1, wherein a folded sheet is formed between two adjacent folds on the first electrode strip;

10. A laminating machine according to claim 8 or claim 9, wherein the laminating device comprises a laminating station disposed downstream of the rolling mechanism and reciprocally movable in a vertical direction, and a clamping jaw reciprocally movable between a discharge end of the rolling mechanism and the laminating station for gripping and folding and placing the second composite strip onto the laminating station.