Composite electrode piece conveying device and composite electrode piece conveying system

Abstract

The present invention provides a composite electrode sheet conveying device and a composite electrode sheet conveying system, which relate to the technical field of lithium battery manufacturing. The composite electrode sheet conveying device comprises a first frame and a second frame arranged opposite to each other, a first hot pressing roller assembly is arranged on the first frame, and a second hot pressing roller assembly is arranged on the second frame. A pressing channel for the composite electrode sheet to pass through is formed between the first hot pressing roller assembly and the second hot pressing roller assembly, and the first hot pressing roller assembly and the second hot pressing roller assembly are used to press the upper and lower sides of the composite electrode sheet respectively. Compared with the prior art, the composite electrode sheet conveying device provided by the present invention replaces the Mylar film by the hot pressing roller assembly to clamp and convey the composite electrode sheet, which can avoid the use of the MYLAR film, and at the same time, no extra equipment is required for compounding, which reduces the overall occupied space and operating costs.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery manufacturing, and in particular to a composite pole piece conveying device and a composite pole piece conveying system. Background Art

[0002] At present, the hot composite lamination machine uses MYLAR film to clamp and transport the pole piece and the diaphragm to protect the pole piece and prevent the pole piece from moving. Due to the large production of lamination, the consumption of MYLAR film is large, which increases the cost of consumables, and the replacement of materials takes up production time.

[0003] In the prior art, it is difficult to replace MYLAR film for thermal lamination by other methods because of the inability to find a suitable carrier. At the same time, the use of MYLAR film for lamination will require the installation of many additional corresponding equipment, which will undoubtedly increase the overall occupied space, and the structure will be complicated, which will increase the downtime for machine change. In addition, the MYLAR film itself is also expensive as a consumable material, which increases the operating cost.

[0004] In view of this, it is particularly important to design and manufacture a composite electrode conveying device that can avoid the use of MYLAR film and does not require additional equipment for composite, thereby reducing the overall occupied space and operating costs. Summary of the invention

[0005] The object of the present invention is to provide a composite electrode conveying device, which can avoid the use of MYLAR film and does not require additional equipment for composite, thereby reducing the overall occupied space and operating costs.

[0006] Another object of the present invention is to provide a composite electrode conveying device, which has a good composite effect, occupies a small space and has a low cost.

[0007] The present invention is achieved by adopting the following technical solutions.

[0008] On the one hand, the present invention provides a composite electrode sheet conveying device, comprising a first frame and a second frame arranged relatively to each other, a first hot pressure roller assembly being provided on the first frame, a second hot pressure roller assembly being provided on the second frame, a pressing channel for the composite electrode sheet to pass through being formed between the first hot pressure roller assembly and the second hot pressure roller assembly, and the first hot pressure roller assembly and the second hot pressure roller assembly are used to press on the upper and lower sides of the composite electrode sheet respectively.

[0009] Furthermore, the first hot pressing roller assembly includes a plurality of first pressing rollers, which are rotatably arranged on the first frame and are arranged parallel to each other for pressing on the upper surface of the composite electrode sheet.

[0010] Furthermore, the first hot pressing roller assembly further includes a plurality of first heaters, which are disposed on the first frame and staggered with the plurality of first pressing rollers for heating the upper surface of the composite electrode sheet.

[0011] Furthermore, the second hot pressing roller assembly includes a plurality of second pressing rollers, which are rotatably arranged on the second frame, and the plurality of second pressing rollers are arranged parallel to each other, and together with the plurality of first pressing rollers, form the pressing channel, and the plurality of second pressing rollers are used to press on the lower surface of the composite pole piece.

[0012] Furthermore, the second hot pressing roller assembly further includes a plurality of second heaters, which are disposed on the second frame and staggered with the plurality of second pressing rollers for heating the lower surface of the composite electrode sheet.

[0013] Further, the plurality of first pressing rollers and the plurality of second pressing rollers are arranged in one-to-one correspondence, and the first pressing roller and the plurality of second pressing rollers are all non-contact magnetic gears.

[0014] Furthermore, the composite electrode conveying device also includes a roller drive assembly, which is arranged on the first frame and is transmission-connected to the first hot pressure roller assembly for driving the first hot pressure roller assembly to move; or the roller drive assembly is arranged on the second frame and is transmission-connected to the second hot pressure roller assembly for driving the second hot pressure roller assembly to move.

[0015] Furthermore, the composite electrode conveying device also includes a frame driving mechanism, which is connected to the first frame and is used to drive the first frame to approach or move away from the second frame to adjust the width of the pressing channel.

[0016] Furthermore, a first feed roller is provided at one end of the first frame body close to the feed port of the lamination channel, and a second feed roller is provided at one end of the second frame body close to the feed port of the lamination channel. The first feed roller and the second feed roller are arranged opposite to each other and form a feed channel connected to the lamination channel.

[0017] A composite electrode sheet conveying system includes a heating driven roller assembly and a composite electrode sheet conveying device, wherein the composite electrode sheet conveying device includes a first frame and a second frame arranged opposite to each other, wherein a first hot pressing roller assembly is arranged on the first frame, and a second hot pressing roller assembly is arranged on the second frame, wherein a pressing channel for the composite electrode sheet to pass through is formed between the first hot pressing roller assembly and the second hot pressing roller assembly, and the first hot pressing roller assembly and the second hot pressing roller assembly are used to press the upper and lower sides of the composite electrode sheet respectively. The heating driven roller assembly is arranged on the discharge side of the pressing channel.

[0018] The present invention has the following beneficial effects:

[0019] The present invention provides a composite electrode conveying device, which is provided by arranging a first hot pressing roller assembly on a first frame, and a second hot pressing roller assembly on a second frame, and the first frame and the second frame are arranged relative to each other, so that a pressing channel for the composite electrode to pass through is formed between the first hot pressing roller assembly and the second hot pressing roller assembly, and at the same time, the first hot pressing roller assembly and the second hot pressing roller assembly are respectively pressed on the upper and lower sides of the composite electrode to clamp the composite electrode, ensuring that there is no relative movement between the components of the composite electrode. Compared with the prior art, the composite electrode conveying device provided by the present invention uses a hot pressing roller assembly to replace the Mylar film to clamp and convey the composite electrode, which can avoid the use of MYLAR film, and at the same time, there is no need to set up additional redundant equipment for compounding, which reduces the overall occupied space and operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic diagram of the overall structure of a composite electrode conveying device provided in the first embodiment of the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram of the installation structure of the first frame and the second frame;

[0023] Figure 3 for Figure 2 A schematic diagram of the installation structure of the first pressing roller and the second pressing roller;

[0024] Figure 4 A schematic structural diagram of a composite electrode conveying system provided in the second embodiment of the present invention.

[0025] Icons: 100-composite electrode conveying device; 110-first frame; 111-first feeding roller; 120-first hot pressing roller assembly; 121-first pressing roller; 123-first heater; 130-second frame; 131-second feeding roller; 140-second hot pressing roller assembly; 141-second pressing roller; 143-second heater; 150-frame driving mechanism; 151-opening and closing cylinder; 153-driving mounting frame; 170-roller driving assembly; 200-heating drive roller assembly. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the inventive product is usually placed when in use, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0032] First embodiment

[0033] See also Figure 1 The present embodiment provides a composite electrode conveying device 100, which replaces the Mylar film with a hot pressing roller assembly to clamp and convey the composite electrode, thereby avoiding the use of the MYLAR film and eliminating the need for additional equipment for composite, thereby reducing the overall occupied space and operating costs.

[0034] The composite electrode sheet conveying device 100 provided in this embodiment includes a first frame 110, a second frame 130, a frame driving mechanism 150 and a roller driving assembly 170. The first frame 110 and the second frame 130 are arranged opposite to each other. A first hot pressing roller assembly 120 is arranged on the first frame 110, and a second hot pressing roller assembly 140 is arranged on the second frame 130. A pressing channel for the composite electrode sheet to pass through is formed between the first hot pressing roller assembly 120 and the second hot pressing roller assembly 140, and the first hot pressing roller assembly 120 and the second hot pressing roller assembly 140 are used to press the upper and lower sides of the composite electrode sheet respectively. The roller driving assembly 170 is arranged on the first frame 110 and is connected to the first hot pressing roller assembly 120 for driving the first hot pressing roller assembly 120 to move; or the roller driving assembly 170 is arranged on the second frame 130 and is connected to the second hot pressing roller assembly 140 for driving the second hot pressing roller assembly 140 to move. The frame driving mechanism 150 is connected to the first frame 110 and is used to drive the first frame 110 to move closer to or away from the second frame 130 to adjust the width of the pressing channel.

[0035] In this embodiment, the second frame 130 is fixedly mounted on a mounting frame, and the frame driving mechanism 150 is mounted on the mounting frame and is in transmission connection with the first frame 110, so as to drive the first frame 110 to approach or move away from the second frame 130. The first frame 110 is disposed above the second frame 130, and the first hot-pressing roller assembly 120 is disposed on the lower side of the first frame 110, and the second hot-pressing roller assembly 140 is disposed on the upper side of the second frame 130, so as to form a pressing channel between the first hot-pressing roller assembly 120 and the second hot-pressing roller assembly 140.

[0036] In this embodiment, the width of the pressing channel increases or narrows with the movement of the first frame 110. Specifically, when the first frame 110 approaches the second frame 130 to the extreme position, the width of the pressing channel should be slightly smaller than the thickness of the composite electrode sheet, so that the composite electrode sheet can be pressed through the pressing channel. When the first hot pressure roller assembly 120 or the second hot pressure roller assembly 140 needs to be cleaned or repaired, the first frame 110 is driven away from the second frame 130 by the frame driving mechanism 150, so that the first hot pressure roller assembly 120 and the second hot pressure roller assembly 140 are respectively exposed, thereby facilitating cleaning and maintenance.

[0037] It should be noted that the composite electrode mentioned in this embodiment is a conventional electrode and diaphragm laminated product, generally a layer of diaphragm is sandwiched between two layers of electrode, of course, other lamination methods can also be used, which is not limited here. The laminated sheets are pressed through the pressing channel and then transported to the next process.

[0038] The frame driving mechanism 150 includes an opening and closing cylinder 151 and a driving mounting frame 153. The driving mounting frame 153 is fixedly mounted on an external frame. The opening and closing cylinder 151 is mounted on the driving mounting frame 153, and the piston rod of the opening and closing cylinder 151 is connected to the first frame 110. Driven by the opening and closing cylinder 151, the first frame 110 can move in a vertical direction, thereby approaching or moving away from the second frame 130.

[0039] In this embodiment, a guide rod is also provided on the upper side of the first frame 110, and the driving mounting frame 153 is arranged directly above the first frame 110, and a guide hole for the guide rod to pass through is opened on the driving mounting frame 153. The guide rod moves in the vertical direction under the guidance of the guide hole, so that the first frame 110 can accurately move in the vertical direction.

[0040] Of course, the opening and closing cylinder 151 can also be replaced by other driving parts, such as electric push rods or hydraulic cylinders, etc., which are not specifically limited here. Any driving part that can drive the first frame 110 to move is within the protection scope of the present invention.

[0041] In this embodiment, a first feeding roller 111 is further provided at one end of the first frame 110 near the feeding port of the pressing channel, and a second feeding roller 131 is further provided at one end of the second frame 130 near the feeding port of the pressing channel. The first feeding roller 111 and the second feeding roller 131 are arranged opposite to each other and form a feeding channel connected to the pressing channel. By arranging the first feeding roller 111 and the second feeding roller 131, the composite electrode sheet passes through a section of the guiding and correcting feeding channel before being loaded into the pressing channel, so as to ensure that it is in an aligned state before pressing.

[0042] See also Figure 2 and Figure 3 The first hot pressing roller assembly 120 includes a plurality of first pressing rollers 121 and a plurality of first heaters 123. The plurality of first pressing rollers 121 are rotatably arranged on the first frame 110, and the plurality of first pressing rollers 121 are arranged parallel to each other for pressing on the upper surface of the composite electrode sheet. The plurality of first heaters 123 are arranged on the first frame 110 and staggered with the plurality of first pressing rollers 121 for heating the upper surface of the composite electrode sheet.

[0043] In this embodiment, a first heater 123 is arranged between each two adjacent first pressing rollers 121. The first heater 123 can transfer part of the heat to the first pressing roller 121 by heat conduction, and then transfer it to the upper surface of the composite electrode through the first pressing roller 121 by heat conduction. At the same time, the first heater 123 can also transfer part of the heat directly to the upper surface of the composite electrode by convection heat transfer. Through the heating effect of the first heater 123, the components of the composite electrode are more conducive to being pressed into one, thereby realizing the thermal compounding function.

[0044] The second hot pressing roller assembly 140 includes a plurality of second pressing rollers 141 and a plurality of second heaters 143. The plurality of second pressing rollers 141 are rotatably arranged on the second frame 130, and the plurality of second pressing rollers 141 are arranged parallel to each other and form a pressing channel together with the plurality of first pressing rollers 121. The plurality of second pressing rollers 141 are used to press on the lower surface of the composite electrode sheet. The plurality of second heaters 143 are arranged on the second frame 130 and staggered with the plurality of second pressing rollers 141 to heat the lower surface of the composite electrode sheet.

[0045] In this embodiment, a second heater 143 is provided between each two adjacent second pressing rollers 141. The second heater 143 can transfer part of the heat to the second pressing roller 141 by heat conduction, and then transfer it to the lower surface of the composite electrode through the second pressing roller 141 by heat conduction. At the same time, the second heater 143 can also transfer part of the heat directly to the lower surface of the composite electrode by convection heat transfer. Through the heating effect of the second heater 143, the components of the composite electrode are more conducive to being pressed into one, thereby realizing the thermal compounding function.

[0046] It should be noted that the heating principle of the first heater 123 and the second heater 143 in this embodiment is the same as that of a conventional thermal composite heater, and will not be described in detail herein.

[0047] In other preferred embodiments of the present invention, a heater is provided only between the first lamination rollers 121 or between the second lamination rollers 141, which can realize the single-sided heating function of the composite electrode and can also realize the thermal composite function well when the heating power reaches the predetermined target.

[0048] In this embodiment, a plurality of first lamination rollers 121 and a plurality of second lamination rollers 141 are respectively arranged in the horizontal direction, and the plurality of first lamination rollers 121 and the plurality of second lamination rollers 141 are arranged one by one, and the first lamination rollers 121 and the plurality of second lamination rollers 141 are all non-contact magnetic gears. Specifically, there is no direct contact between the first lamination roller 121 and the second lamination roller 141, but the mutual transmission function is realized through magnetism. The magnetic gear is basically a transmission device without the tooth type of traditional gears, and the magnetic coupling force is used to attract and repel each other to achieve the purpose of transmission. Power is transmitted through non-contact magnetic gears, and the non-contact magnetic gears have the characteristics of ultra-low dust generation and no need for grease, so as to avoid some impurities adhering to the surface of the pole piece and affecting the quality of the battery cell.

[0049] In this embodiment, the center distance between two adjacent first pressing rollers 121 and the center distance between two adjacent second pressing rollers 141 are both smaller than the minimum size of the pole piece, which can avoid the state where the pole piece is not pressed. The pressing surfaces of the first pressing roller 121 and the second pressing roller 141 are treated with high-strength Teflon to protect the pole piece and the diaphragm.

[0050] It should be noted that, since the first lamination roller 121 and the second lamination roller 141 can realize mutual transmission when transporting the composite electrode sheet, and the rotation directions of the first lamination roller 121 and the second lamination roller 141 are opposite, the present embodiment only needs to provide power to the first lamination roller 121 or the second lamination roller 141. Specifically, in the present embodiment, the roller drive assembly 170 is connected to the second lamination roller 141 by transmission, so that the second lamination roller 141 is the active roller and the first lamination roller 121 is the driven wheel, thereby realizing the transportation of the composite electrode sheet.

[0051] The roller drive assembly 170 includes a plurality of independent servo motors disposed on the second frame 130, and the plurality of servo motors correspond to the plurality of second laminating rollers 141 one by one. Each servo motor is disposed below the corresponding second laminating roller 141, and can independently control the second laminating roller 141 to rotate along the direction of driving the composite electrode sheet to be transported. Of course, the plurality of servo motors can also be disposed on the first frame 110 and be transmission-connected to the plurality of first laminating rollers 121.

[0052] In summary, the composite electrode sheet conveying device 100 provided in this embodiment has the following working principle: the composite electrode sheet enters the pressing channel through the feeding channel, and the pressing channel is composed of a plurality of corresponding first pressing rollers 121 and second pressing rollers 141. The pressing force between the first pressing roller 121 and the second pressing roller can be adjusted with the lifting and lowering of the first frame 110, and is controlled by the opening and closing cylinder 151. At the same time, the first pressing roller 121 and the second pressing roller 141 are heated by the heater. Through the pressing action of the first pressing roller 121 and the second pressing roller 141, and the heating function of the heater, the components of the composite electrode sheet can be tightly fitted and enter the next process. Compared with the prior art, the composite electrode sheet conveying device 100 provided in this embodiment uses a hot pressing roller assembly to replace the Mylar film to clamp and convey the composite electrode sheet, which can avoid the use of MYLAR film, and no additional equipment is required for compounding, which reduces the overall occupied space and operating costs.

[0053] Second embodiment

[0054] See also Figure 4 A composite electrode conveying system includes a heating driven roller assembly 200 and a composite electrode conveying device 100, wherein the basic structure and principle of the composite electrode conveying device 100 and the technical effect produced are the same as those of the first embodiment. For the sake of brief description, parts not mentioned in this embodiment may refer to the corresponding contents in the first embodiment.

[0055] The composite electrode sheet conveying device 100 comprises a first frame 110 and a second frame 130 which are arranged opposite to each other, a first hot pressing roller assembly 120 is arranged on the first frame 110, and a second hot pressing roller assembly 140 is arranged on the second frame 130. A pressing channel for the composite electrode sheet to pass through is formed between the first hot pressing roller assembly 120 and the second hot pressing roller assembly 140, and the first hot pressing roller assembly 120 and the second hot pressing roller assembly 140 are used to press the upper and lower sides of the composite electrode sheet respectively. The heating drive roller assembly 200 is arranged on the discharge side of the pressing channel.

[0056] In this embodiment, after being pressed by the first pressing roller 121 and the second pressing roller 141, the composite electrode enters the heated roller assembly for further rolling, and the rolling pressure is greater than the clamping force of the upper and lower steel rollers.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A composite electrode conveying device, characterized in that: The invention comprises a first frame and a second frame which are arranged opposite to each other, wherein a first hot pressing roller assembly is arranged on the first frame, and a second hot pressing roller assembly is arranged on the second frame, and a pressing channel for a composite electrode sheet to pass through is formed between the first hot pressing roller assembly and the second hot pressing roller assembly, and the first hot pressing roller assembly and the second hot pressing roller assembly are used to press the upper and lower sides of the composite electrode sheet respectively; The first hot pressing roller assembly comprises a plurality of first pressing rollers, which are rotatably arranged on the first frame and are arranged parallel to each other for pressing on the upper surface of the composite electrode sheet; The second hot pressing roller assembly comprises a plurality of second pressing rollers, which are rotatably arranged on the second frame, and the plurality of second pressing rollers are arranged parallel to each other, and together with the plurality of first pressing rollers form the pressing channel, and the plurality of second pressing rollers are used to press on the lower surface of the composite electrode sheet; The plurality of first pressing rollers and the plurality of second pressing rollers are arranged in one-to-one correspondence, and the first pressing roller and the plurality of second pressing rollers are non-contact magnetic gears, and the first pressing roller and the second pressing roller transmit transmission to each other.

2. The composite electrode conveying device according to claim 1, characterized in that: The first hot pressing roller assembly further includes a plurality of first heaters, which are disposed on the first frame and staggered with the plurality of first pressing rollers for heating the upper surface of the composite electrode sheet.

3. The composite electrode conveying device according to claim 1, characterized in that: The second hot pressing roller assembly further includes a plurality of second heaters, which are disposed on the second frame and staggered with the plurality of second pressing rollers for heating the lower surface of the composite electrode sheet.

4. The composite electrode conveying device according to claim 1, characterized in that: The composite electrode conveying device also includes a roller drive assembly, which is arranged on the first frame and is transmission-connected to the first hot pressure roller assembly for driving the first hot pressure roller assembly to move; or the roller drive assembly is arranged on the second frame and is transmission-connected to the second hot pressure roller assembly for driving the second hot pressure roller assembly to move.

5. The composite electrode conveying device according to claim 1, characterized in that: The composite electrode conveying device further comprises a frame driving mechanism, which is connected to the first frame and is used to drive the first frame to approach or move away from the second frame to adjust the width of the pressing channel.

6. The composite electrode conveying device according to claim 1, characterized in that: A first feed roller is also provided at one end of the first frame body close to the feed port of the lamination channel, and a second feed roller is also provided at one end of the second frame body close to the feed port of the lamination channel. The first feed roller and the second feed roller are arranged opposite to each other and form a feed channel connected to the lamination channel.

7. A composite electrode conveying system, characterized in that: It comprises a heating driven roller assembly and a composite electrode sheet conveying device as described in any one of claims 1 to 6, wherein the heating driven roller assembly is arranged on the discharge side of the pressing channel.

Images