CN218039349U

CN218039349U - Thermal compounding device

Info

Publication number: CN218039349U
Application number: CN202221854451.8U
Authority: CN
Inventors: 刘毅仁; 熊建敏; 邹海天; 赵健鑫
Original assignee: Shenzhen Hymson Laser Intelligent Equipment Co Ltd
Current assignee: Hymson Laser Technology Group Co Ltd
Priority date: 2022-07-18
Filing date: 2022-07-18
Publication date: 2022-12-13
Anticipated expiration: 2032-07-18

Abstract

The utility model discloses a thermal compound equipment for pressfitting pole piece and diaphragm thermal compound form compound pole piece, include: pole piece unwinding mechanism, diaphragm unwinding mechanism, roll-in system and winding mechanism. The pole piece unreeling mechanism is used for unreeling the pole pieces. The membrane unwinding mechanism is used for unwinding the membrane. The rolling system comprises a plurality of rolling mechanisms distributed along the conveying direction of the pole piece, each rolling mechanism comprises a heating module, a first roller and a second roller, each heating module is used for heating the pole piece, a rolling gap for the pole piece and the diaphragm to pass through is formed between the first roller and the second roller, the pole piece and the diaphragm sequentially pass through the rolling gaps of the plurality of rolling mechanisms, and the rolling gaps of the plurality of rolling mechanisms are gradually reduced. The winding mechanism is used for winding the composite pole piece. The utility model discloses can carry out a lot of roll-ins to the pole piece, only need make pole piece and diaphragm part bonding at every turn, consequently need the length of heating before roll-in at every turn can set up shorter to improve pole piece thermal recombination efficiency.

Description

Thermal compounding device

Technical Field

The utility model relates to a battery pole piece thermal recombination technical field, in particular to thermal recombination equipment.

Background

At present, in order to improve the efficiency of the lamination process, the membrane and the pole piece are usually pre-compounded before the lamination process is performed, specifically, after the positive pole piece, the negative pole piece and the membrane are heated by a heating mechanism, the positive pole piece, the negative pole piece and the membrane are rolled by using proper pressure, and are mutually attached to form a composite product with a certain thickness. In the related art, one-time rolling forming is usually adopted, and the pole piece needs longer heating time and rolling time, so that the pole piece conveying speed is slower, and the thermal compounding efficiency is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a thermal compound equipment can improve work efficiency to diaphragm and the quick pressfitting of pole piece.

According to the utility model discloses thermal compound equipment for pressfitting pole piece and diaphragm, include:

the pole piece unreeling mechanism is used for unreeling the pole pieces;

the membrane unreeling mechanism is used for unreeling the membrane;

the rolling system comprises a plurality of rolling mechanisms distributed along the conveying direction of the pole piece, a heating module of the rolling mechanism, a first roller and a second roller, wherein the heating module is used for heating the pole piece, a rolling gap for the pole piece and the diaphragm to pass through is formed between the peripheral surfaces of the first roller and the second roller, the pole piece and the diaphragm sequentially pass through the rolling gaps of the plurality of rolling mechanisms so as to thermally compound the pole piece and the diaphragm to form a composite pole piece, and the rolling gaps of the plurality of rolling mechanisms are gradually reduced along the conveying direction of the pole piece so as to roll the composite pole piece sequentially passing through the plurality of rolling gaps for a plurality of times;

and the winding mechanism is used for winding the composite pole piece.

According to the utility model discloses thermal compound equipment has following beneficial effect at least:

be provided with a plurality of rolling mechanisms along the direction of delivery of pole piece, and the roll-in clearance of rolling mechanism reduces gradually to make the whole thickness subassembly of pole piece and diaphragm reduce and reach demand thickness, because the pole piece carries out the roll-in many times, consequently, can shorten the length of time of heating before the roll-in at every turn, promptly, improve the transport speed of pole piece, thereby improve pole piece thermal recombination efficiency.

According to some embodiments of the invention, the first roll is made of an insulating material, the heating module comprises a first induction coil, along the direction of transport of the pole pieces, the first induction coil being located upstream of the rolling gap.

According to some embodiments of the utility model, the heating module includes a plurality of first induction coil, and is a plurality of first induction coil follows the circumference of first roll is arranged in proper order.

According to some embodiments of the present invention, the first induction coil is provided as an arc coil adapted to the outer circumferential surface of the first roll, and the first induction coil is provided in the radial outer side of the first roll.

According to some embodiments of the utility model, the roll-in clearance has feed end and discharge end, pole piece unwinding mechanism is located the most upstream in the roll-in system roll-in mechanism roll-in clearance one side of discharge end.

According to some embodiments of the invention, the heating module further comprises a second induction coil, along the direction of transport of the pole piece, the second induction coil is located downstream of the rolling gap.

According to the utility model discloses a some embodiments, the second induction coil set up into with the circular arc coil of the outer peripheral face adaptation of second roll, the second induction coil is located the radial outside of second roll.

According to some embodiments of the utility model, the rolling mechanism still includes the transition roller, the transition roller with have between the outer peripheral face of second roll and be used for supplying the transition clearance that the pole piece passed, the pole piece passes the transition clearance is in order to increase the pole piece with the cornerite of second roll.

According to the utility model discloses a some embodiments, it is a plurality of rolling mechanism winds pole piece unwinding mechanism's circumference distributes.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The invention will be further described with reference to the following drawings and examples, in which:

FIG. 1 is a schematic structural diagram of a thermal compound apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a thermal compound apparatus according to another embodiment of the present invention;

FIG. 3 is a schematic view of the heating module and the first roller of FIG. 2;

FIG. 4 is a schematic structural view of a thermal compound apparatus according to another embodiment of the present invention;

fig. 5 is a schematic structural view of another embodiment of the thermal compound apparatus of the present invention.

Reference numerals:

a pole piece coiling cylinder 1000, a diaphragm coiling cylinder 2000, a pole piece 3000, a diaphragm 4000, a composite pole piece 5000 and a winding roller 6000;

a pole piece unwinding mechanism 100 and a diaphragm unwinding mechanism 200;

the device comprises a rolling mechanism 300, a first rolling roller 310, a second rolling roller 320, a heating module 330, a first induction coil 331, a first bracket 332, a first magnetizer 333, a transition roller 340 and an adjusting mechanism 350;

winding mechanism 400, mechanism 500 of rectifying.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the directional descriptions, such as the directions or positional relationships indicated by upper, lower, front, rear, left, right, etc., are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but not for indicating or implying that the mechanism or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means is one or more, a plurality of means is two or more, and the terms greater than, less than, more than, etc. are understood as excluding the term, and the terms greater than, less than, etc. are understood as including the term. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Fig. 1 is the utility model discloses thermal compound equipment structure schematic diagram, refer to fig. 1, the thermal compound equipment of this embodiment for pressfitting pole piece 3000 forms composite pole piece 5000 with diaphragm 4000 is compound, include: pole piece unwinding mechanism 100, diaphragm unwinding mechanism 200, roll-in system and winding mechanism 400.

Wherein, pole piece unwinding mechanism 100 is used for unreeling with antipole 3000. The membrane unwinding mechanism 200 is used for unwinding the membrane 4000. The rolling system comprises a plurality of rolling mechanisms 300 distributed along the conveying direction of the pole piece 3000, each rolling mechanism 300 comprises a heating module 330, a first roller 310 and a second roller 320, each heating module 330 is used for heating the pole piece 3000, a rolling gap for the pole piece 3000 and the diaphragm 4000 to pass through is formed between the outer peripheral surfaces of the first roller 310 and the second roller 320, the pole piece 3000 and the diaphragm 4000 sequentially pass through the rolling gaps of the rolling mechanisms 300 to compound the pole piece 3000 and the diaphragm 4000 to form the composite pole piece 5000, and the rolling gaps of the rolling mechanisms 300 are gradually reduced along the conveying direction of the pole piece 3000, so that the composite pole piece 5000 sequentially passing through the rolling gaps is rolled for multiple times. And the winding mechanism 400 is used for winding the composite pole piece 5000.

Specifically, the pole piece unwinding mechanism 100 is used for bearing the pole piece winding drum 1000, the pole piece 3000 is wound on the outer peripheral surface of the pole piece winding drum 1000, the diaphragm unwinding mechanism 200 is used for bearing the diaphragm winding drum 2000, the diaphragm 4000 is wound on the outer peripheral surface of the diaphragm winding drum 2000, and the pole piece winding drum 1000 and the diaphragm winding drum 2000 can be driven to rotate around an axis to unwind the pole piece 3000 and the diaphragm 4000. The diaphragm 4000 and the pole piece 3000 are drawn to a first rolling mechanism 300 of a rolling system through a mechanical arm or a manual mode and the like, the pole piece 3000 enters a rolling gap after being heated by a heating module 330 of the rolling mechanism 300, the pole piece is rolled and compounded by a first roller 310 and a second roller 320 to form a composite pole piece 5000, and the composite pole piece 5000 is sequentially rolled and pressed for multiple times through a subsequent rolling mechanism 300, so that the bonding degree of the pole piece 3000 and the diaphragm 4000 meets the use requirement.

It is understood that the higher the temperature of the substance, the more active the molecular motion and the faster the binding speed with other substances. Based on this, the thermal compound device of this embodiment rolls the pole piece 3000 many times, and only the pole piece 3000 needs to be partially bonded with the diaphragm 4000 each time. Therefore, the time length of heating before rolling can be set to be shorter, namely the conveying speed of the composite pole piece 5000 can be set to be faster, and the thermal compounding efficiency of the pole piece 3000 is improved.

In addition, pole piece coil stock section of thick bamboo 1000 and pole piece unwinding mechanism 100 can be dismantled and be connected, and diaphragm coil stock section of thick bamboo 2000 and diaphragm unwinding mechanism 200 can be dismantled and be connected, and wind-up roll 6000 and winding mechanism 400 can be dismantled and be connected to the convenience is changed. For example, when the pole piece 3000 on the pole piece roll material cylinder 1000 is completely discharged, the pole piece roll material cylinder 1000 can be detached from the pole piece unwinding mechanism 100 for feeding.

It should be noted that the arrangement of only four rolling mechanisms 300 in fig. 1 is not to be construed as the only limitation of the present embodiment, and any number of two, three, etc. can be arranged according to the size of pole piece 3000 to be compressed.

Referring to fig. 2 and 3, fig. 2 is a schematic structural view of a thermal compound apparatus according to another embodiment of the present invention, and fig. 3 is a schematic structural view of a heating module and a first roller in fig. 2, in some embodiments, the first roller 310 is made of an insulating material, and a first induction coil 331 is located upstream of a rolling gap along a conveying direction of a pole piece 3000.

Specifically, the first roller 310 is made of an insulating material, the first induction coil 331 is disposed on a radial outer side of the first roller 310, and has a heating gap for the pole piece 3000 to pass through with the first roller 310, the first induction coil 331 is electrically connected to an alternating power supply, the alternating power supply can generate a variable voltage to generate an alternating current inside the first induction coil 331, so that the first induction coil 331 generates a variable magnetic field, and the variable magnetic field can generate an eddy current inside the pole piece 3000, so that the temperature of the pole piece 3000 is raised. In the embodiment, the heating module 330 is disposed outside the first roller 310, and the first induction coil 331 is used for non-contact heating, so that the first roller 310 does not need to be modified, thereby saving the manufacturing cost.

Referring to fig. 2 and 3, in some embodiments, the heating module 330 includes a plurality of first induction coils 331, and the plurality of first induction coils 331 are sequentially arranged in a circumferential direction of the first roll 310. Or the heating module 330 includes a plurality of second induction coils, which are sequentially arranged along the circumferential direction of the second roll 320. Or the heating module 330 includes a plurality of first induction coils 331 and a plurality of second induction coils, the plurality of first induction coils 331 are sequentially arranged along the circumferential direction of the first rolling roller 310, and the plurality of second induction coils are sequentially arranged along the circumferential direction of the second rolling roller 320.

Specifically, it is known that the magnetic field generated by the induction coil is in a scattering state, and the magnetic field intensity at each point of the magnetic field is different, so that when the magnetic field changes, a high temperature region and a low temperature region are formed on the pole piece 3000. In this embodiment, heat pole piece 3000 through setting up a plurality of first induction coil 331 to disperse into a plurality of little temperature domains with high-temperature region and low-temperature region on pole piece 3000, make pole piece 3000 be heated more evenly, thereby can make the whole temperature of pole piece 3000 reach the setting value more fast, consequently can improve pole piece 3000's conveying speed, in order to improve work efficiency.

In some embodiments, the heating module 330 includes a first induction coil 331, the first induction coil 331 is configured as an arc coil adapted to the first roll 310, and the first induction coil 331 is located radially outward of the first roll 310.

Specifically, the first induction coil 331 is arranged on the radial outer side of the first roller 310 in an arc structure, and the distance between the first induction coil 331 and the rolling gap is small, so that the pole piece 3000 can enter the rolling gap after being heated, and the heat loss is reduced. In addition, the shape of the first induction coil 331 is adapted to the shape of the first roller 310, and the coverage of the first induction coil 331 and the first roller 310 in the circumferential direction of the first roller 310, that is, the coverage in the conveying direction of the pole piece 3000, can be increased as much as possible, so that the heating time of the pole piece 3000 can be prolonged, and the heating effect of the pole piece 3000 is improved. Therefore, this embodiment can improve the conveying speed of the pole piece 3000 while ensuring that the pole piece 3000 reaches the set temperature, thereby improving the thermal compounding speed.

In addition, it can be understood that the first induction coil 331 is arranged radially outside the first roller 310 in an arc structure, so that the distance between the first induction coil 331 and the outer circumferential surface of the first roller 310 along the circumferential direction of the first roller 310 is equal, and therefore, the uniformity of the eddy current inside the pole piece 3000 during the transportation process of the pole piece 3000 is improved, so that the pole piece 3000 is uniformly heated, and the induction heating effect is improved.

Referring to fig. 1, based on the above embodiment, the roll gap has a feeding end and a discharging end, and the pole piece unwinding mechanism 100 is located at one side of the discharging end of the roll gap of the most upstream roll pressing mechanism 300 in the roll pressing system. Specifically, the most upstream rolling mechanism 300 is explained as that, in the moving process of the pole piece 3000, the first rolling mechanism 300 is passed through by the pole piece 3000, the pole piece unreeling mechanism 100 is located at one side of the discharge end of the rolling gap to increase the wrap angle between the pole piece 3000 and the first roller 310, so that the arc length of the first arc-shaped induction coil 331 is correspondingly increased to increase the heating time of the pole piece 3000, and further, the conveying speed of the pole piece 3000 can be increased to increase the thermal compounding speed.

In addition, it can be understood that, during the operation, the magnetic field generated by the first induction coil 331 is in a scattering state, and part of the magnetic lines of force enter the pole piece 3000 to heat the pole piece 3000, and part of the magnetic lines of force may be in the air. Based on that the magnetic flux trajectory of the first induction coil 331 flows along the direction with the smallest magnetic resistance, the heating module 330 in this embodiment further includes a first magnetic conductor 333, and the first magnetic conductor 333 is connected to one side of the first induction coil 331 close to the first rolling roller 310 or one side of the first induction coil 331 far away from the first rolling roller 310. Or one side of the first induction coil 331, which is away from the first roller 310, and one side of the first induction coil which is close to the first roller 310 are both connected with the first magnetizer 333, so as to change the direction of the magnetic field, so that the magnetic field is gathered on the pole piece 3000, and the induction heating effect is improved.

Heating module 330 still includes the first support 332 with first induction coil 331 adaptation, first support 332 sets up in the radial outside of first roll 310, so that first support 332 plays the supporting role to first induction coil 331, improve first induction coil 331's intensity, prevent that first induction coil 331 from taking place great deformation for long-time work, and lead to the magnetic field direction to change, so as to ensure that pole piece 3000 is located the comparatively sensitive position of magnetic field change, thereby guarantee pole piece 3000 heating effect. First support 332 still includes the baffle, and first induction coil 331 is encircleed from inside to outside by the wire and is formed many circles of structures, and the baffle is located between the adjacent circle layer of many circles of structures, prevents that the side contact on each circle layer from resulting in the short circuit to guarantee pole piece 3000 induction heating effect. And also can support the wires to improve the strength of the first induction coil 331.

In some embodiments, the heating module 330 further comprises a second induction coil, which is located downstream of the roll nip. Specifically, the second induction coil is used for heating pole piece 3000 after the roll-in to slow down 3000 temperature reduction rate of pole piece, thereby reduce the heat that 3000 needs inputs of pole piece before the roll-in next time, consequently can improve 3000 transport speed of pole piece, thereby improve hot recombination efficiency. The heating module 330 further includes a second magnetizer and a second bracket, the second magnetizer and the second magnetizer are connected to the second induction coil, and are connected to the first magnetizer 333 and the first bracket 332 with the first induction coil 331, and a plurality of second induction coils are disposed along the circumferential direction of the second roller 320, and are disposed with the plurality of first induction coils, which is not described herein again.

In some embodiments, the second induction coil is provided as a circular arc coil that is fitted to the outer circumferential surface of the second roll 320, the second induction coil being located radially outward of the second roll 320. Specifically, have the clearance between second induction coil and the second roll 320, because the second induction coil sets up to the circular arc coil with the outer peripheral face adaptation of second roll 320, consequently along pole piece direction of delivery, this clearance size equals to make pole piece 3000 equal with the distance between the second induction coil in transportation process, make pole piece 3000 thermally equivalent, improve pole piece 3000 heating effect, make the whole heating of pole piece 3000 faster, thereby improve hot compound speed.

Referring to fig. 2, in some embodiments, the rolling mechanism 300 further includes a transition roller 340, the transition roller 340 and the outer circumferential surface of the second rolling roller 320 have a transition gap therebetween for passing a pole piece 3000, and the pole piece 3000 passes through the transition gap to increase the wrap angle of the pole piece 3000 and the second rolling roller 320. Specifically, the transition roller 340 is disposed at the downstream of the pole piece 3000 in the conveying direction, for example, the transition roller 340 shown in the figure is located at one side of the feeding end of the rolling gap to change the conveying direction of the pole piece 3000, so as to increase the wrap angle between the pole piece 3000 and the second roller 320, and correspondingly increase the arc length of the second induction coil in the arc shape, so as to increase the heating time of the pole piece 3000, and further improve the conveying speed of the pole piece 3000, so as to improve the thermal compounding speed.

Referring to fig. 1, in some embodiments, a plurality of rolling mechanisms 300 are distributed around the circumference of the pole piece unwinding mechanism 100, so as to improve the space utilization rate and reduce the field use requirement of the thermal compound equipment in this embodiment.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a thermal compound apparatus according to another embodiment of the present invention, and in some embodiments, the rolling mechanism 300 further includes an adjusting mechanism 350, and the adjusting mechanism 350 is used for adjusting the size of the rolling gap. Specifically, the adjusting mechanism 350 includes a moving member connected to the first roller 310 or the second roller 320, and the moving member is adjusted to drive the first roller 310 and the second roller 320 to approach or separate from each other, so as to change the size of the rolling gap.

Referring to fig. 5, fig. 5 is the structure diagram of another embodiment of the thermal compound equipment of the present invention, in some embodiments, the thermal compound equipment further includes a deviation rectifying mechanism 500, between the pole piece unwinding mechanism 100 and the membrane unwinding mechanism 200 and the rolling system, between the adjacent rolling mechanisms 300 in the rolling system, between the rolling system and the rolling mechanism 400, any one or two of the three are provided with the deviation rectifying mechanism 500, or the three is provided with the deviation rectifying mechanism 500. Specifically, a deviation correcting mechanism 500 is arranged between the pole piece unwinding mechanism 100 and the membrane unwinding mechanism 200 and the rolling system to adjust the positions of the pole piece 3000 and the membrane 4000 in the width direction, so that the pole piece 3000 is aligned with the membrane 4000. A deviation rectifying mechanism 500 is arranged between adjacent rolling mechanisms 300 in the rolling system to adjust the position of the composite pole piece 5000 formed by thermal compounding along the width direction, so as to ensure that the composite pole piece 5000 can be completely rolled by the first roller 310 in the width direction. A deviation correcting mechanism 500 is arranged between the rolling system and the rolling mechanism 400 to adjust the position of the composite pole piece 5000 along the width direction, so as to ensure that the composite pole piece 5000 can be wound on the outer peripheral surface of the rolling roller 6000 and is located in the range of the outer peripheral surface of the rolling roller 6000.

In some embodiments, the device further comprises a transmission mechanism, and the pole piece unwinding mechanism 100, the membrane unwinding mechanism 200, the winding mechanism 400 and the rolling system are connected through the transmission mechanism, and the rolling mechanisms 300 of the rolling system are connected through the transmission mechanism, so that the linear velocities of the outer peripheral surfaces of the pole piece winding drum 1000, the membrane winding drum 2000, the winding roller 6000 and the first roller 310 in each rolling mechanism 300 are the same. Specifically, the transmission mechanism may be a pulley transmission or a gear transmission, which is common in a mechanical transmission, and the thermal compound device includes a driving device, and the driving device is connected to the winding mechanism 400, or any one of the first roller 310 or the second roller 320 in the rolling system. For example, the driving device is connected to the winding mechanism 400, the driving device can drive the winding roller 6000 on the winding mechanism 400 to rotate, and the winding roller 6000, the pole piece unwinding mechanism 100, the diaphragm unwinding mechanism 200 and the rolling system are conventionally connected through a synchronous belt, so that when the winding roller 6000 rotates, the pole piece winding drum 1000, the diaphragm winding drum 2000, the winding roller 6000 and the first rollers 310 in the rolling mechanisms 300 rotate synchronously, and the linear velocities of the outer peripheral surfaces of the pole piece winding drum 1000, the diaphragm winding drum 2000, the winding roller 6000 and the first rollers 310 in the rolling mechanisms 300 are the same, thereby preventing the pole piece 3000 from being pulled in the conveying process and avoiding the pole piece 3000 from being torn.

It should be noted that the linear velocities of the outer peripheral surfaces of the pole piece winding drum 1000, the diaphragm winding drum 2000, the take-up roll 6000 and the first rolling roll 310 in the rolling mechanisms 300 according to the present embodiment are the same, and cannot be interpreted as absolute differences in the numerical values, which allows a certain range of differences.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.

Claims

1. Thermal compound equipment, its characterized in that for pressfitting pole piece forms compound pole piece with the diaphragm, includes:

the pole piece unreeling mechanism is used for unreeling the pole pieces;

the membrane unwinding mechanism is used for unwinding the membrane;

the rolling system comprises a plurality of rolling mechanisms distributed along the conveying direction of the pole piece, each rolling mechanism comprises a heating module, a first roller and a second roller, the heating module is used for heating the pole piece, a rolling gap for the pole piece and the diaphragm to pass through is formed between the outer peripheral surfaces of the first roller and the second roller, the pole piece and the diaphragm sequentially pass through the rolling gaps of the plurality of rolling mechanisms to thermally compound the pole piece and the diaphragm to form a composite pole piece, and the rolling gaps of the plurality of rolling mechanisms are gradually reduced along the conveying direction of the pole piece so that the composite pole piece sequentially passing through the rolling gaps is rolled for a plurality of times;

and the winding mechanism is used for winding the composite pole piece.

2. The thermal compounding device of claim 1, wherein the first roll is made of an insulating material, and the heating module includes a first induction coil located upstream of the roll nip in a direction of transport of the pole piece.

3. The thermal compounding device of claim 2, wherein the heating module comprises a plurality of first induction coils arranged in sequence along a circumferential direction of the first roll.

4. The thermal compounding device of claim 2, wherein the first induction coil is provided as a circular arc coil that is fitted to an outer circumferential surface of the first roll, the first induction coil being provided radially outward of the first roll.

5. The thermal compounding device of claim 4, wherein the roll nip has a feed end and a discharge end, the pole piece unwinding mechanism being located on a side of the discharge end of the roll nip of the most upstream roll mechanism in the roll system.

6. The thermal compounding device of claim 2, wherein the heating die set further comprises a second induction coil located downstream of the roll nip in a direction of transport of the pole piece.

7. The thermal compounding device of claim 6, wherein the second induction coil is provided as a circular arc coil that fits an outer peripheral surface of the second roll, the second induction coil being located radially outward of the second roll.

8. The thermal compounding device of claim 6, wherein the rolling mechanism further comprises a transition roller having a transition gap between an outer peripheral surface of the second roller and the transition roller for the pole piece to pass through, the pole piece passing through the transition gap to increase a wrap angle of the pole piece with the second roller.

9. The thermal compounding device of claim 1, wherein a plurality of the rolling mechanisms are distributed around a circumference of the pole piece unwinding mechanism.

10. The thermal compounding device of claim 1, wherein the rolling mechanism further comprises an adjustment mechanism for adjusting a size of the rolling gap.