Thermal compounding system for pole piece

Abstract

The utility model discloses a pole piece thermal compounding system which comprises a first pole piece discharging assembly, a diaphragm discharging assembly, a first thermal compounding assembly, a second pole piece discharging assembly and a second thermal compounding assembly which are sequentially arranged in the pole piece conveying direction. Each of the first thermal compounding assembly and the second thermal compounding assembly comprises two hot pressing rollers, a protective film unwinding mechanism and a dust removal mechanism, the two hot pressing rollers are oppositely arranged, and the first pole piece or the second pole piece passes through the space between the two hot pressing rollers along with the continuous diaphragm; the protective film unwinding mechanism is used for unwinding a protective film, the protective film penetrates through the space between the two hot-pressing rollers and covers the surface, close to the hot-pressing rollers, of the continuous diaphragm, and the hot-pressing rollers perform hot-pressing on the protective film, so that the first pole piece or the second pole piece is thermally compounded with the continuous diaphragm; the dust removal mechanism is arranged on the side face, away from the hot-pressing roller, of the protective film and located between the collecting end of the protective film and the hot-pressing roller. The problems of roller sticking and dust sticking caused by direct contact between the diaphragm and the hot pressing roller in the prior art are solved.

Description

Technical Field

[0001] The present application belongs to the field of battery processing technology, and in particular, relates to a pole piece thermal composite system. Background Art

[0002] At present, the laminated cells of lithium batteries are processed by thermal composite technology, which cuts the continuous positive and negative pole pieces into single positive and negative pole pieces, and thermally composites the single positive and negative pole pieces with continuous diaphragms respectively. During the thermal composite process, the diaphragm contacts the hot pressing roller, and there is a problem of diaphragm sticking to the roller. The roller surface of the hot pressing roller is not easy to clean after being covered with impurities, and the impurities stick to the surface of the diaphragm, resulting in short circuit of the battery core pack. Utility Model Content

[0003] The embodiments of the present application provide a pole piece thermal composite system to solve the existing problem of the diaphragm being in direct contact with the hot pressing roller and causing the diaphragm to stick to the roller and dust.

[0004] The embodiment of the present application provides a pole piece thermal composite system, comprising a first pole piece discharging assembly, a diaphragm discharging assembly, a first thermal composite assembly, a second pole piece discharging assembly and a second thermal composite assembly which are sequentially arranged along the direction of pole piece conveyance, wherein the first pole piece discharging assembly and the second pole piece discharging assembly are used to provide a first pole piece and a second pole piece respectively, and the diaphragm discharging assembly is used to provide a continuous diaphragm;

[0005] Wherein, the first thermal composite component and the second thermal composite component both include:

[0006] Two hot pressing rollers, the two hot pressing rollers are arranged opposite to each other, and the first pole piece or the second pole piece follows the continuous diaphragm to pass between the two hot pressing rollers;

[0007] A protective film unwinding mechanism, used for unwinding a protective film, wherein the protective film passes between the two hot pressing rollers and covers the surface of the continuous diaphragm close to the hot pressing rollers, and the hot pressing rollers heat press the protective film so that the first pole piece or the second pole piece is thermally composited with the continuous diaphragm;

[0008] The dust removal mechanism is arranged on a side of the protective film away from the hot pressing roller and is located between the receiving end of the protective film and the hot pressing roller.

[0009] Optionally, the protective film unwinding mechanism includes:

[0010] A protective film discharge roller is arranged upstream of the hot pressing roller along the direction of conveying the electrode piece, and the protective film drawn by the protective film discharge roller passes between the two hot pressing rollers;

[0011] The protective film receiving roller is located downstream of the hot pressing roller along the direction of conveying the pole piece, and is used to rewind the protective film pulled out from the hot pressing roller. The dust removal mechanism is located between the protective film receiving roller and the hot pressing roller.

[0012] Optionally, the first pole piece discharging assembly includes:

[0013] The first electrode sheet unloading roller is used for unloading continuous negative electrode sheets;

[0014] The etching mechanism is arranged between the first electrode sheet discharge roller and the diaphragm discharge assembly, and the etching mechanism is used to etch away the active material layer in a local area on the negative electrode sheet to form an etching area on the negative electrode sheet.

[0015] Optionally, the etching mechanism is a laser etcher.

[0016] Optionally, the first pole piece discharging assembly includes:

[0017] A first unwinding mechanism, used for unwinding the first pole piece of the monomer;

[0018] The second unwinding mechanism is used for unwinding the first pole piece of the monomer, and the first unwinding mechanism and the second unwinding mechanism are used for alternately conveying the first pole piece along the conveying direction of the pole piece.

[0019] Optionally, the diaphragm discharge assembly includes:

[0020] A first diaphragm unwinding mechanism, used for unwinding a first continuous diaphragm, wherein the first continuous diaphragm is located on one side of the first pole piece;

[0021] The second diaphragm unwinding mechanism is used for unwinding a second continuous diaphragm, and the second continuous diaphragm is located on the other side of the first pole piece.

[0022] Optionally, the second pole piece discharge assembly includes:

[0023] A third unwinding mechanism, located on one side of the continuous diaphragm, for unwinding the second pole piece;

[0024] The fourth unwinding mechanism is located on the other side of the continuous diaphragm and is used for unwinding the second pole piece. The third unwinding mechanism and the fourth unwinding mechanism are used for alternately conveying the second pole piece along the direction of conveying the pole piece.

[0025] Optionally, the second pole piece discharging assembly further includes:

[0026] A heating mechanism is arranged on the transmission path of the second pole piece and is located before the second pole piece contacts the continuous diaphragm. The heating mechanism is used to heat the second pole piece.

[0027] Optionally, the heating mechanism includes a first heating plate, a second heating plate, a guide member and an adjusting member, the first heating plate and the second heating plate are arranged opposite to each other, the first heating plate and the second heating plate are movably connected through the guide member, the adjusting member is connected to the first heating plate and is used to adjust the gap between the first heating plate and the second heating plate, and the second pole piece passes through the gap.

[0028] Optionally, the protective film includes PET material, PP material or PC material.

[0029] The electrode thermal composite system provided in the embodiment of the present application includes a first electrode discharge assembly, a diaphragm discharge assembly, a first thermal composite assembly, a second electrode discharge assembly and a second thermal compress assembly which are arranged in sequence along the direction of electrode conveying, the first electrode discharge assembly is used to provide the first electrode, the second electrode discharge assembly is used to provide the second electrode, the diaphragm discharge assembly is used to provide a continuous diaphragm, the first thermal composite assembly is used to thermally composite the first electrode with the continuous diaphragm, and the second thermal composite assembly is used to thermally composite the second electrode with the continuous diaphragm, wherein the first thermal composite assembly and the second thermal composite assembly both include a hot pressing roller, a protective film unwinding mechanism and a dust removal mechanism, the protective film unwinding mechanism is used for unwinding protection, the protective film separates the continuous diaphragm from the hot pressing roller, the continuous diaphragm is in indirect contact with the hot pressing roller, and then the dust removal mechanism is used to clean the side of the protective film in contact with the continuous diaphragm, thereby overcoming the problems of sticking to the roller and dust in the existing direct contact between the diaphragm and the hot pressing roller, and avoiding the occurrence of short circuit of the battery core pack due to impurities adhering to the surface of the continuous diaphragm, and having the advantages of simple structure, reasonable layout of various components and improved processing yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0031] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0032] Figure 1 A schematic diagram of a first form of a pole piece thermal composite system provided in an embodiment of the present application.

[0033] Figure 2 A schematic diagram of a second form of a pole piece thermal composite system provided in an embodiment of the present application.

[0034] Figure 3A schematic diagram of a third form of the pole piece thermal composite system provided in an embodiment of the present application.

[0035] Figure 4 A schematic diagram of a heating mechanism in a thermal composite system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0037] The embodiment of the present application provides a pole piece thermal composite system to solve the existing problem of the diaphragm directly contacting with the hot pressing roller and causing the diaphragm to stick to the roller and dust. The system will be described below with reference to the accompanying drawings.

[0038] See also Figure 1 , Figure 2 and Figure 3 As shown, Figure 1 A schematic diagram of a first form of a pole piece thermal composite system provided in an embodiment of the present application, Figure 2 A schematic diagram of a second form of a pole piece thermal composite system provided in an embodiment of the present application, Figure 3 A schematic diagram of a third form of the pole piece thermal composite system provided in an embodiment of the present application. A pole piece thermal composite system according to an embodiment of the present application is used for thermally composite pole pieces and diaphragms. The system includes a first pole piece discharge assembly 100, a diaphragm discharge assembly 200, a first thermal composite assembly 300, a second pole piece discharge assembly 400 and a second thermal composite assembly 500, which are arranged in sequence along the direction of pole piece conveyance. The first pole piece discharge assembly 100 is used to provide a first pole piece 110, the second pole piece discharge assembly 400 is used to provide a first pole piece 110 and a second pole piece 410, and the diaphragm discharge assembly 200 is used to provide a continuous diaphragm 210. According to the different structures of the processed folded battery cells, the first pole piece 110 and the second pole piece 410 are different, the battery cells of the first pole piece 110 and the second pole piece 410 are opposite, when the first pole piece 110 is a positive pole piece, the second pole piece 410 is a negative pole piece, when the first pole piece 110 is a negative pole piece, the second pole piece 410 is a positive pole piece, and the negative pole piece can be a single pole piece or a continuous pole piece.

[0039] In this embodiment, see Figure 1As shown, the first thermal composite component 300 and the second thermal composite component 500 both include two hot pressing rollers 310, a protective film unwinding mechanism 320 and a dust removal mechanism 340. The two hot pressing rollers 310 are arranged opposite to each other. The first pole piece 110 or the second pole piece 410 follows the continuous diaphragm 210 to pass between the two hot pressing rollers 310. When the first pole piece 110 follows the continuous diaphragm 210 to pass through the hot pressing rollers 310, the hot pressing rollers 310 thermally composite the first pole piece 110 with the continuous diaphragm 210. When the second pole piece 410 follows the continuous diaphragm 210 to pass between the two hot pressing rollers 310, the hot pressing rollers 310 thermally composite the second pole piece 410 with the continuous diaphragm 210.

[0040] In this embodiment, see Figure 1 As shown, the protective film unwinding mechanism 320 is used to unwind the protective film 330. The protective film 330 passes between the two hot pressing rollers 310 and covers the surface of the continuous diaphragm 210 close to the hot pressing roller 310. The hot pressing roller 310 hot presses the protective film 330, so that the first pole piece 110 or the second pole piece 410 is thermally compounded with the continuous diaphragm 210. It can be understood that when the first pole piece 110 follows the continuous diaphragm 210 to pass through the hot pressing roller 310 or the second pole piece 410 follows the continuous diaphragm 210 to pass between the two hot pressing rollers 310, the protective film 330 separates the continuous diaphragm 210 from the hot pressing roller 310 to avoid the continuous diaphragm 210 and the hot pressing roller 310 from adhering. The protective film 330 will not affect the heat transfer of the hot pressing roller 310, thereby ensuring the hot pressing effect.

[0041] In this embodiment, see Figure 1 As shown, the dust removal mechanism 340 is arranged on the side of the protective film 330 away from the hot pressing roller 310, and is located between the receiving end of the protective film 330 and the hot pressing roller 310. The dust removal mechanism 340 can be a dust brush, a rag or a sponge that can be used for cleaning. The dust removal mechanism 340 is fixedly arranged, and the width of the dust removal mechanism 340 is not less than the width of the protective film 330. During the winding process of the protective film 330, the dust removal mechanism 340 wipes each position of the protective film 330 to ensure the cleanliness after wiping. It can be understood that during the thermal composite process, the side of the protective film 330 that contacts the continuous diaphragm 210 will be adhered to dust or powder. The surface of the protective film 330 is wiped clean by the dust removal mechanism 340 and then rolled up, so that the protective film 330 can be reused to reduce costs.

[0042] In some embodiments, the protective film 330 includes a PET (polyethylene terephthalate) material, a PP (polypropylene) material, or a PC (polycarbonate) material.

[0043] In this embodiment, the protective film 330 made of PET material, PP material or PC material has good protective performance and tensile performance, and the material cost is low.

[0044] In some embodiments, see Figure 1 and Figure 2 As shown, when continuous diaphragms 210 are provided on both sides of the first pole piece 110 , two protective film unwinding mechanisms 320 are provided. The two protective film unwinding mechanisms 320 are arranged in opposition, and one hot pressing roller 310 corresponds to one protective film unwinding mechanism 320 .

[0045] In some embodiments, see Figure 3 As shown, when a continuous diaphragm 210 is provided, the first pole piece 110 is located on one side of the continuous diaphragm 210 , the second pole piece 410 is located on the other side of the continuous diaphragm 210 , the protective film unwinding mechanism 320 of the first thermal composite component 300 is located on one side of the continuous diaphragm 210 , and the protective film unwinding mechanism 320 of the second thermal composite component 500 is located on the other side of the continuous diaphragm 210 .

[0046] In some embodiments, see Figure 1 As shown, the protective film unwinding mechanism 320 includes a protective film unwinding roller 321 and a protective film receiving roller 322. The protective film unwinding roller 321 is arranged upstream of the hot pressing roller 310 along the direction of the pole piece conveying. The protective film 330 pulled out by the protective film unwinding roller 321 passes between the two hot pressing rollers 310. The protective film receiving roller 322 is located downstream of the hot pressing roller 310 along the direction of the pole piece conveying, and is used for receiving and receiving the protective film 330 pulled out from the hot pressing roller 310. The protective film unwinding roller 321 and the protective film receiving roller 322 are located on the same side of the continuous diaphragm 210. The protective film unwinding roller 321 and the protective film receiving roller 322 tension the protective film 330. The dust removal mechanism 340 is located between the protective film receiving roller 322 and the hot pressing roller 310. During the hot lamination process, the unwinding speed of the protective film unwinding mechanism 320 is the same as the winding speed, ensuring that the protective film 330 is in a tensioned state while preventing the protective film 330 from being over-stretched, deformed or broken. In addition, the unwinding speed of the protective film 330 is the same as the rotation speed of the hot pressing roller 310, preventing the speed of the protective film 330 or the continuous diaphragm 210 from not matching and causing wrinkles.

[0047] In some embodiments, see Figure 1 As shown, the first electrode sheet discharge assembly 100 includes a first electrode sheet discharge roller 120 and an etching mechanism 130. The first electrode sheet discharge roller 120 is used to discharge the negative electrode sheet. The negative electrode sheet is in a continuous strip shape. The etching mechanism 130 is arranged between the first electrode sheet discharge roller 120 and the diaphragm discharge assembly 200. The etching mechanism 130 is used to etch away the active material layer in a local area on the negative electrode sheet to form an etched area on the negative electrode sheet.

[0048] It can be understood that the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer arranged on both sides of the negative electrode current collector. In the present embodiment, during the transmission of the negative electrode sheet, the active material layer on the negative electrode sheet is partially etched away by the etching mechanism 130. The length of the etching area is the same as the width of the negative electrode sheet, and the width of the etching area is less than the bending width of the negative electrode sheet. The negative electrode sheet between adjacent etching areas is bent and used in conjunction with the positive electrode sheet. The negative electrode active material in the bending part is etched away by the etching mechanism 130 to avoid the situation where the active material falls and causes disconnection when the negative electrode sheet is bent, and the reliability of the laminated battery cell processed by this system is better. In addition, for folded batteries, the etching mechanism 130 can etch away the negative electrode active material located on the outside of the negative electrode sheets on the outermost sides, without the need for diaphragm coating insulation, reducing materials and reducing costs.

[0049] In one of the above embodiments, the etching mechanism 130 is a laser etcher, and two laser etchers are provided, which are respectively arranged on both sides of the negative electrode sheet, to perform etching operations on both sides of the negative electrode sheet to improve the effect.

[0050] In some embodiments, see Figure 1 As shown, the first electrode sheet unwinding assembly 100 includes a first unwinding mechanism 140 and a second unwinding mechanism 150. The first unwinding mechanism 140 and the second unwinding mechanism 150 are both used for unwinding the first electrode sheet 110 of the monomer. The first electrode sheet 110 can be a negative electrode sheet. The first unwinding mechanism 140 and the second unwinding mechanism 150 alternately transmit the negative electrode sheet of the monomer along the direction of electrode sheet transportation, thereby improving the transmission efficiency of the first electrode sheet 110.

[0051] In some embodiments, see Figure 1 and Figure 2 As shown, the diaphragm unwinding assembly 200 includes a first diaphragm unwinding mechanism 220 and a second diaphragm unwinding mechanism 230. The first diaphragm unwinding mechanism 220 is used to unwind the first continuous diaphragm, which is located on one side of the first pole piece 110; the second diaphragm unwinding mechanism 230 is used to unwind the second continuous diaphragm, which is located on the other side of the first pole piece 110.

[0052] In this embodiment, the first continuous diaphragm unwinding mechanism 220 and the second continuous diaphragm unwinding mechanism 230 unwind the first pole piece 110 on both sides, and the first pole piece 110 is well covered to prevent the first pole piece 110 from directly contacting and short-circuiting with the second pole piece 410.

[0053] In some embodiments, see Figure 1 and Figure 2As shown, the second pole piece unwinding assembly 400 includes a third unwinding mechanism 420 and a fourth unwinding mechanism 430. The third unwinding mechanism 420 is located on the side of the continuous diaphragm 210 such as the first continuous diaphragm away from the second diaphragm. The third unwinding mechanism 420 is used to unwind the second pole piece 410 of the monomer. The fourth unwinding mechanism 430 is located on the other side of the continuous diaphragm 210 such as the second continuous diaphragm away from the first continuous diaphragm. The fourth unwinding mechanism 430 is used to unwind the second pole piece 410 of the monomer. The third unwinding mechanism 420 and the fourth unwinding mechanism 430 are used to alternately transport the second pole piece 410 along the direction of pole piece conveying.

[0054] In this embodiment, the second pole piece 410 is a positive pole piece, and the second pole piece 410 is alternately transmitted on both sides by the third unwinding mechanism 420 and the fourth unwinding mechanism 430. Each first pole piece 110 is provided with a first continuous diaphragm, a second continuous diaphragm, and a second pole piece 410 to form a unit structure, which reduces the number of folding times and improves the processing efficiency of the stacked battery cell.

[0055] Based on the above implementation, see Figure 1 , Figure 2 and Figure 3 As shown, the second pole piece discharge assembly 400 also includes a heating mechanism 440 , which is disposed on the transmission path of the second pole piece 410 and located before the second pole piece 410 contacts the continuous diaphragm 210 . The heating mechanism 440 is used to heat the second pole piece 410 .

[0056] Before the second pole piece 410 is thermally combined with the continuous diaphragm 210, the second pole piece 410 is preheated by the heating mechanism 440, and then the preheated second pole piece 410 is thermally combined with the continuous diaphragm 210. The temperature required for the second thermal combination assembly 500 is reduced to ensure the thermal combination effect.

[0057] Based on the above implementation, see Figure 4As shown, the heating mechanism 440 includes a first heating plate 441, a second heating plate 442, a guide member 443 and an adjusting member 444. The first heating plate 441 and the second heating plate 442 are rectangular plates. The sizes of the first heating plate 441 and the second heating plate 442 are slightly larger than the corresponding single second pole piece 410. The first heating plate 441 and the second heating plate 442 are arranged relatively spaced apart. The first heating plate 441 and the second heating plate 442 are movably connected through the guide member 443. The guide member 443 can be a guide column, which is respectively arranged at the four corners of the first heating plate 441 and the second heating plate 442 to avoid the second pole piece 410. The adjusting member 444 is connected to a side of the first heating plate 441 away from the second heating plate 442. The adjusting member 444 can be a cylinder. The adjusting member 444 is used to adjust the first heating plate 441 to be close to or away from the second heating plate 442, so as to adjust the gap 445 between the first heating plate 441 and the second heating plate 442, and the second pole piece 410 passes through the gap 445.

[0058] It can be understood that in this embodiment, the second pole piece 410 is preheated by the first heating plate 441 and the second heating plate 442, and the gap between the diameters of the first heating plate 441 and the second heating plate 442 is adjusted by the adjusting member 444, which is suitable for second pole pieces 410 of different thicknesses, has convenient adjustment operation and a wide range of applications.

[0059] This embodiment also provides a processing system for a folded battery cell, including the pole piece thermal composite system described in the above embodiment, and also including a folding structure, etc.

[0060] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0061] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0062] The above is a detailed introduction to the electrode thermal composite system provided in the embodiment of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, based on the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A pole piece thermal composite system, characterized in that: The invention comprises a first pole piece discharging assembly (100), a diaphragm discharging assembly (200), a first thermal composite assembly (300), a second pole piece discharging assembly (400) and a second thermal composite assembly (500) which are sequentially arranged along the direction of pole piece conveyance, wherein the first pole piece discharging assembly (100) and the second pole piece discharging assembly (400) are respectively used to provide a first pole piece (110) and a second pole piece (410), and the diaphragm discharging assembly (200) is used to provide a continuous diaphragm (210); Wherein, the first thermal composite component (300) and the second thermal composite component (500) both include: Two hot pressing rollers (310), the two hot pressing rollers (310) are arranged opposite to each other, and the first pole piece (110) or the second pole piece (410) follows the continuous diaphragm (210) and passes between the two hot pressing rollers (310); a protective film unwinding mechanism (320) for unwinding a protective film (330), wherein the protective film (330) passes between the two hot pressing rollers (310) and covers the surface of the continuous diaphragm (210) close to the hot pressing rollers (310), and the hot pressing rollers (310) heat-press the protective film (330) so that the first pole piece (110) or the second pole piece (410) is thermally composited with the continuous diaphragm (210); The dust removal mechanism (340) is arranged on a side of the protective film (330) away from the hot pressing roller (310), and is located between the receiving end of the protective film (330) and the hot pressing roller (310).

2. The pole piece thermal composite system according to claim 1, characterized in that: The protective film unwinding mechanism (320) comprises: A protective film discharge roller (321) is arranged upstream of the hot pressing roller (310) along the direction of conveying the electrode sheet, and the protective film (330) drawn by the protective film discharge roller (321) passes between the two hot pressing rollers (310); A protective film receiving roller (322) is located downstream of the hot pressing roller (310) along the direction of conveying the pole piece, and is used to rewind the protective film (330) pulled out from the hot pressing roller (310). A dust removal mechanism (340) is located between the protective film receiving roller (322) and the hot pressing roller (310).

3. The pole piece thermal composite system according to claim 1, characterized in that: The first pole piece discharging assembly (100) comprises: A first electrode sheet unwinding roller (120) is used for unwinding continuous negative electrode sheets; An etching mechanism (130) is arranged between the first electrode sheet discharge roller (120) and the diaphragm discharge assembly (200), and the etching mechanism (130) is used to etch away the active material layer in a local area on the negative electrode sheet to form an etching area on the negative electrode sheet.

4. The pole piece thermal composite system according to claim 3, characterized in that: The etching mechanism (130) is a laser etcher.

5. The pole piece thermal composite system according to claim 3, characterized in that: The first pole piece discharging assembly (100) comprises: A first unwinding mechanism (140) for unwinding the first pole piece (110) of the monomer; The second unwinding mechanism (150) is used for unwinding the first pole piece (110) of the material unit, and the first unwinding mechanism (140) and the second unwinding mechanism (150) are used for alternately transporting the first pole piece (110) along the direction in which the pole piece is transported.

6. The pole piece thermal composite system according to any one of claims 1 to 5, characterized in that: The diaphragm discharge assembly (200) comprises: A first diaphragm unwinding mechanism (220) for unwinding a first continuous diaphragm, wherein the first continuous diaphragm is located on one side of the first pole piece (110); The second diaphragm unwinding mechanism (230) is used for unwinding a second continuous diaphragm, wherein the second continuous diaphragm is located on the other side of the first pole piece (110).

7. The pole piece thermal composite system according to claim 6, characterized in that: The second pole piece discharging assembly (400) comprises: A third unwinding mechanism (420), located on one side of the continuous diaphragm (210), for unwinding the second pole piece (410); The fourth unwinding mechanism (430) is located on the other side of the continuous diaphragm (210) and is used for unwinding the second pole piece (410). The third unwinding mechanism (420) and the fourth unwinding mechanism (430) are used for alternately transporting the second pole piece (410) along the direction of conveying the pole piece.

8. The pole piece thermal composite system according to claim 7, characterized in that: The second pole piece discharging assembly (400) further comprises: A heating mechanism (440) is arranged on the transmission path of the second pole piece (410) and is located before the second pole piece (410) contacts the continuous diaphragm (210). The heating mechanism (440) is used to heat the second pole piece (410).

9. The pole piece thermal composite system according to claim 8, characterized in that: The heating mechanism (440) comprises a first heating plate (441), a second heating plate (442), a guide member (443) and an adjusting member (444); the first heating plate (441) and the second heating plate (442) are arranged opposite to each other; the first heating plate (441) and the second heating plate (442) are movably connected via the guide member (443); the adjusting member (444) is connected to the first heating plate (441) and is used to adjust a gap (445) between the first heating plate (441) and the second heating plate (442); the second pole piece (410) passes through the gap (445).

10. The pole piece thermal composite system according to any one of claims 1 to 5, characterized in that: The protective film (330) comprises PET material, PP material or PC material.

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