Electromagnetic heating device and thermal compounding equipment

Abstract

The utility model provides an electromagnetic heating device and thermal compounding equipment, the electromagnetic heating device is applied to the thermal compounding equipment, and the thermal compounding equipment is used for performing thermal compounding on a pole piece and a diaphragm of a battery; the electromagnetic heating device comprises at least two electromagnetic heating parts, and the at least two electromagnetic heating parts are used for heating different sides of the same pole piece. According to the utility model, the at least two electromagnetic heating parts are used for heating different sides of the same pole piece, so that the heating efficiency of the pole piece is further improved, and eddy currents can be formed on two sides of the pole piece, so that the two sides of the pole piece are simultaneously heated, heat can be diffused from the two sides of the pole piece to the periphery, the conduction distance of the heat is reduced, and the heat conduction efficiency is improved. The heat can be more easily diffused to all positions of the pole piece, so that the uniformity of temperature distribution on the pole piece is improved, the composite defects such as bubbles and layering caused by temperature difference in the thermal composite process of the pole piece and the diaphragm are reduced, and the composite quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field, concretely relates to an electromagnetic heating device and hot compound equipment. BACKGROUND

[0002] In the lithium battery roll production, usually need to heat softening treatment to the lithium battery's pole piece base material, in order to facilitate the pole piece's tensile wrinkle, ensure that the aluminum foil and the coating area's extension is basically identical.

[0003] The related technology provides magnetic induction heating as the mode of pole piece heating, does not need to contact the pole piece, does not affect the pole piece's travel speed, is energy -efficient, and the contactless heating avoids the pollution or damage to the pole piece. However, when using magnetic induction heating in the related technology, the temperature distribution on the pole piece is uneven, which leads to poor composite effect of the pole piece and the diaphragm, and affects the quality of the prepared battery cell. SUMMARY

[0004] The embodiment of the utility model provides a kind of electromagnetic heating device, can improve the technical problem of uneven pole piece temperature when magnetic induction heating in the related art.

[0005] First, the embodiment of the utility model provides a kind of electromagnetic heating device, is applied to hot compound equipment, and the hot compound equipment is used to heat the pole piece and diaphragm of battery;The electromagnetic heating device includes at least two electromagnetic heating parts, and at least two electromagnetic heating parts are used to heat the different sides of the same pole piece.

[0006] In some embodiments, the distance between the two electromagnetic heating parts for heating different sides of the same pole piece and the pole piece is D, and 5mm≤D≤15mm.

[0007] In some embodiments, the electromagnetic heating component device includes:

[0008] Housing;And,

[0009] Metal coil, at least part of the metal coil is arranged in the housing, to be used for composing the electromagnetic heating part, to generate magnetic field to heat the pole piece.

[0010] In some embodiments, the wire of the metal coil is hollow wire, so that cooling medium flow channel is formed in the wire, and the cooling medium flow channel is used for cooling medium flow.

[0011] In some embodiments, one metal coil is arranged in each electromagnetic heating part;Or,

[0012] The metal coil comprises a first portion, a second portion and a third portion, the first portion and the third portion are connected to different ends of the second portion, and the first portion and the third portion are located in different electromagnetic heating parts respectively, so that at least two electromagnetic heating parts share the metal coil.

[0013] In some embodiments, the electromagnetic heating assembly further comprises a magnetic conducting member, the magnetic conducting member is arranged in the shell, the magnetic conducting member is provided with a receiving groove, at least part of the metal coil is arranged in the receiving groove, and the opening of the receiving groove faces the pole piece.

[0014] In some embodiments, the cross-sectional area of at least part of the area of at least one electromagnetic heating part gradually decreases along the conveying direction of the pole piece.

[0015] In the second aspect, the embodiments of the utility model provide a thermal compounding device, comprising:

[0016] A pole piece driving roller and an inlet roller, the pole piece driving roller is used for conveying a pole piece to the inlet roller, and the inlet roller is used for pressing a diaphragm and the pole piece;

[0017] The electromagnetic heating device in the foregoing embodiments, the electromagnetic heating part is arranged between the pole piece driving roller and the inlet roller, and is used for heating different sides of the same pole piece.

[0018] In some embodiments, the electromagnetic heating part comprises a first electromagnetic heating part, and the first electromagnetic heating part is located between the pole piece and the diaphragm.

[0019] In some embodiments, the first electromagnetic heating part comprises a first surface facing the pole piece and a second surface facing the diaphragm.

[0020] The distance between the first surface and the second surface decreases along the conveying direction of the pole piece.

[0021] In some embodiments, the included angle between the first surface and the second surface is A, and 25°≤A≤40°; and / or,

[0022] The included angle between the diaphragm and the pole piece is B, and 25°≤B≤40°.

[0023] In some embodiments, the thermal compounding device further comprises:

[0024] A rolling roller, the rolling roller is located downstream of the inlet roller along the conveying direction of the pole piece; and,

[0025] A temperature measuring device, the temperature measuring device is arranged between the inlet roller and the rolling roller, and the temperature measuring device is used for measuring the temperature of the pole piece.

[0026] In some embodiments, the thermal compounding device further comprises a rolling roller, which is located downstream of the feeding roller along the conveying direction of the pole piece.

[0027] Wherein, along the conveying direction of the pole piece, the distance between the electromagnetic heating part and the feeding roller is d, d≤30mm.

[0028] The embodiment of the utility model has the advantages of:

[0029] In the utility model, the electromagnetic heating device comprises at least two electromagnetic heating parts, the heating efficiency of the pole piece is further improved by heating different sides of the same pole piece by the at least two electromagnetic heating parts, and the vortex can be formed on both sides of the pole piece, so that the both sides of the pole piece are heated at the same time, the heat can spread from both sides of the pole piece to the surrounding, the heat conduction distance is reduced, the heat can be more easily diffused to the pole piece, the uniformity of temperature distribution on the pole piece is improved, the composite defects such as bubble, delamination caused by temperature difference during the thermal compounding of the pole piece and diaphragm are reduced, and the compounding quality is improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0031] Figure 1 It is the structural schematic diagram of the embodiment electric compounding device of the utility model;

[0032] Figure 2 It is the structural schematic diagram of the embodiment electromagnetic heating device of the utility model;

[0033] Figure 3 It is the structural schematic diagram of the metal coil provided by the embodiment of the utility model;

[0034] Figure 4 It is the structural schematic diagram of the metal coil provided by the embodiment of the utility model;

[0035] Figure 5 It is the structural schematic diagram of the metal coil provided by the embodiment of the utility model.

[0036] The respective reference numerals in the drawing are:

[0037] 1, electromagnetic heating device;

[0038] 11, electromagnetic heating part; 111, housing; 112, metal coil; 1121, wire; 1122, cooling medium flow channel; 1123, first part; 1124, second part; 1125, third part;

[0039] 12, magnetic conducting member; 121, accommodating groove; 122, slot;

[0040] 13, first electromagnetic heating part; 131, first surface; 132, second surface;

[0041] 2, thermal compounding device;

[0042] 21, pole piece driving roller; 22, feeding roller; 23, rolling roller; 24, temperature measuring device;

[0043] 3, pole piece;

[0044] 4, separator;

[0045] H1, conveying direction of pole piece. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to 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 the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and specifically refer to the direction of the drawing in the drawings. And "inner" and "outer" refer to the outline of the device.

[0047] With reference to Figure 1 and Figure 2 The present application provides an electromagnetic heating device 1 in the first aspect, which is applied to a thermal compounding device 2, and the thermal compounding device 2 is used for thermally compounding a pole piece 3 of a battery and a separator 4. The electromagnetic heating device 1 comprises at least two electromagnetic heating parts 11, and the at least two electromagnetic heating parts 11 are used for heating different sides of the same pole piece 3.

[0048] In use, the electromagnetic heating device 1 is installed at a suitable position so that a space is formed between the at least two electromagnetic heating portions 11 for the pole piece 3 to pass through; when the hot composite device 2 is started, the pole piece 3 continuously passes between the two electromagnetic heating portions 11, and after the electromagnetic heating device 1 is powered on, a stable magnetic field is generated, and the moving pole piece 3 will form countless small eddy currents inside due to the magnetic induction lines cutting the magnetic field, the eddy currents will make the atoms in the metal material inside the pole piece 3 move randomly, and the friction between the atoms will generate heat energy, thereby finally causing the metal material to heat up at a high speed, thereby achieving heating of the pole piece 3.

[0049] Since the plurality of electromagnetic heating portions 11 are respectively located at different sides of the pole piece 3, eddy currents can be formed on both sides of the pole piece 3, thereby simultaneously heating both sides of the pole piece 3, and the heat can spread from both sides of the pole piece 3 to the surroundings, reducing the conduction distance of the heat, so that the heat can more easily spread to all parts of the pole piece 3, thereby improving the uniformity of the temperature distribution on the pole piece 3. Moreover, due to process or material reasons, for example, the shape of the electromagnetic coil generating the magnetic field is irregular, the material is not uniform, or the spacing between each turn is not uniform, etc., which will cause the magnetic field generated by the electromagnetic heating portion 11 to be unevenly distributed, and the strength of the magnetic field will also affect the size of each eddy current formed inside the pole piece 3, therefore, by using the plurality of electromagnetic heating portions 11 to heat the pole piece 3, the distribution of the regions where larger eddy currents are generated inside the pole piece 3 will be more uniform, thereby improving the efficiency of heat diffusion and making the temperature distribution on the pole piece 3 more uniform.

[0050] The strength of the magnetic field generated by the electromagnetic heating portion 11 can be set according to the type of the pole piece 3 and the speed at which the pole piece 3 moves, which is not limited in the embodiments of the present application. The strength of the magnetic field is related to the size of the current, and adjusting the current intensity to be larger can make the electromagnetic heating portion 11 generate a stronger magnetic field; adjusting the current intensity to be smaller can make the electromagnetic heating portion 11 generate a weaker magnetic field. The size of the electromagnetic heating portion 11 can be set according to the size of the pole piece 3 to be heated, and generally needs to control the magnetic field generated by the electromagnetic heating portion 11 to cover the entire pole piece 3 in the width direction of the pole piece 3, so that eddy currents are generated everywhere on the pole piece 3, thereby improving the uniformity of the temperature everywhere on the pole piece 3.

[0051] In some embodiments, the plurality of electromagnetic heating portions 11 are symmetrically arranged on both sides of the pole piece 3, which reduces the occupation of the installation space of the electromagnetic heating portion 11 to the hot composite device 2, simplifies the installation steps, and improves the ornamental value.

[0052] In some embodiments, since the magnetic field generated by the electromagnetic heating part 11 is generally a non-uniform magnetic field, generally the farther away from the electromagnetic heating part 11, the smaller the magnetic field strength, and therefore the edge portion of the pole piece 3 generates smaller eddy current, so that the plurality of electromagnetic heating parts 11 can be arranged staggered on both sides of the pole piece 3, so that the edge portion of the pole piece 3 is also kept in a stronger magnetic field, thereby improving the uniformity of the temperature distribution on the pole piece 3.

[0053] In the utility model, the electromagnetic heating device 1 includes at least two electromagnetic heating parts 11, by making at least two electromagnetic heating parts 11 heat different sides of the same pole piece 3, further improve the heating efficiency of pole piece 3, also make both sides of pole piece 3 can form eddy current, thereby heating both sides of pole piece 3, heat can spread from both sides of pole piece 3 to all around, reduce the conduction distance of heat, make heat can more easily spread to pole piece 3 everywhere, thereby improve the uniformity of temperature distribution on pole piece 3, reduce the composite defects such as bubble, delamination caused by temperature difference in the thermal compounding process of pole piece 3 and diaphragm 4, improve the compounding quality.

[0054] In an embodiment, referring to Figure 2 The distance between the two electromagnetic heating parts 11 for heating different sides of the same pole piece 3 and the pole piece 3 is D, and 5mm≤D≤15mm.

[0055] If the distance between the electromagnetic heating part 11 and the pole piece 3 is too far, so that D is greater than 15mm, the installation of the electromagnetic heating part 11 needs to occupy more space, which is easy to affect other structures in the thermal compounding equipment 2, and the magnetic field strength generated by the electromagnetic heating part 11 will rapidly decay with the increase of the distance, so that the eddy current strength generated inside the pole piece 3 in the too far position becomes smaller, and the generated heat is reduced, resulting in a decrease in the heating efficiency of the pole piece 3. If the distance between the electromagnetic heating part 11 and the pole piece 3 is too close, so that D is less than 5mm, it is easy to increase the risk of collision or friction between the electromagnetic heating part 11 and the pole piece 3, and if there is a slight displacement or vibration of the pole piece 3 during the processing process, it will contact the electromagnetic heating part 11, resulting in damage to the surface of the pole piece 3; too small distance also increases the installation and maintenance difficulty of the electromagnetic heating device 1, and the staff is not convenient for cleaning, checking and component replacement and other operations.

[0056] Therefore, the distance D between the electromagnetic heating part 11 and the pole piece 3 in the utility model embodiment is set to be between 5mm and 15mm, and exemplarily can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc., and the utility model embodiment does not limit this.

[0057] In the range of the distance, the electromagnetic heating part 11 can generate a magnetic field strong enough to make the pole piece 3 in a region with a suitable magnetic field strength, while keeping enough distance between the electromagnetic heating part 11 and the pole piece 3 to reduce the probability of direct contact between the electromagnetic heating part 11 and the pole piece 3, and improve the composite quality of the pole piece 3 and the diaphragm 4. And the appropriate distance also provides enough operating space for the staff, making it convenient to install the electromagnetic heating part 11 and perform debugging, calibration, cleaning and other work; for example, during the installation process, it is more convenient to use tools to adjust the position and angle of the electromagnetic heating part 11 to ensure the relative position of the electromagnetic heating part 11 and the pole piece 3 is accurate; during the operation of the equipment, it is also easier to operate if the electromagnetic heating part 11 needs to be inspected, repaired or replaced.

[0058] In an embodiment, referring to Figure 2 , the electromagnetic heating device 1 comprises a shell 111; a metal coil 112, at least part of the metal coil 112 is arranged in the shell 111 for composing the electromagnetic heating part 11 to generate a magnetic field to heat the pole piece 3.

[0059] After the metal coil 112 is connected to a high-voltage current, a stable magnetic field is generated, and after the pole piece 3 cuts the magnetic induction lines in the magnetic field, eddy currents are generated in the pole piece 3, thereby achieving heating of the pole piece 3. The shell 111 is used to fix and protect the metal coil 112, and the size and dimensions of the shell 111 can be set according to actual needs, which are not limited by the present application. The shell 111 is usually made of high-strength plastic, such as polyamide 66, polycarbonate, polyphenylene ether, high-density polyethylene, acrylonitrile-butadiene-styrene copolymer, etc. It has high strength and excellent impact resistance and insulation performance, which insulates the metal coil 112 from other objects and improves the safety performance of the electromagnetic heating device 1.

[0060] In an embodiment, referring to Figure 3 , the wire 1121 of the metal coil 112 is a hollow wire, so that a cooling medium flow channel 1122 is formed in the wire 1121, and the cooling medium flow channel 1122 is used for the flow of the cooling medium.

[0061] The metal coil 112 generates heat during operation due to the current passing through, especially when the electromagnetic heating device 1 is operated for a long time or at high power, and the heat accumulation can cause the temperature of the metal coil 112 to be too high. Therefore, in the embodiment of the utility model, the wire 1121 of the metal coil 112 is arranged as a hollow wire, so that the worker can pass the cooling medium into the cooling medium flow channel 1122 in the hollow wire, so that the cooling medium can take away the heat of the metal coil 112 and cool it down, prevent the temperature of the metal coil 112 from being too high, affect the insulation performance and electrical safety of the metal coil 112, and thus improve the service life of the metal coil 112. The cooling medium can be freon, ammonia, cooling water, oil, air, etc., and the utility model does not limit this.

[0062] In an embodiment, referring to Figure 2 and Figure 4 Each electromagnetic heating part 11 is provided with a metal coil 112.

[0063] That is, the electromagnetic heating device 1 includes multiple metal coils 112, and each electromagnetic heating part 11 can be provided with an independent metal coil 112, and the worker can control the on-off of the current in one or more metal coils 112, so as to realize more accurate adjustment of the overall magnetic field strength. Moreover, if one of the electromagnetic heating parts 11 fails during use, it does not affect the normal use of the other electromagnetic heating parts 11, and the heating of the pole piece 3 can still be realized, thereby ensuring the compounding efficiency of the pole piece 3 and the diaphragm 4.

[0064] Optionally, the metal coil 112 can also include a first portion 1123, a second portion 1124 and a third portion 1125, the first portion 1123 and the third portion 1125 are connected to different ends of the second portion 1124, and the first portion 1123 and the third portion 1125 are located in different electromagnetic heating parts 11, so that at least two electromagnetic heating parts 11 share the metal coil 112.

[0065] For example, when the electromagnetic heating device 1 includes two electromagnetic heating parts 11, one metal coil 112 can be bent into a U shape, and the relatively parallel first portion 1123 and the third portion 1125 are arranged in the two electromagnetic heating parts 11, respectively, and when the pole piece 3 passes through the U-shaped metal coil 112, the heating of the pole piece 3 can be realized. By making multiple electromagnetic heating parts 11 share the same metal coil 112, the number of turns of the coil is increased, and the second portion 1124 can also provide a certain magnetic field, thereby improving the heating efficiency of the pole piece 3; and only a single coil needs to be heated, which simplifies the setting of the power supply circuit, making the electromagnetic heating device 1 easier to install.

[0066] In some embodiments, referring to Figure 5When the plurality of electromagnetic heating portions 11 can share the same metal coil 112, the first portion 1123 and the third portion 1125 of the metal coil 112 can be set as coils, and the second portion 1124 can be set as a straight wire 1121, thereby saving the material used in the manufacturing of the metal coil 112 and reducing the manufacturing cost of the electromagnetic heating device 1.

[0067] In an embodiment, referring to Figure 2 The electromagnetic heating device 1 further comprises a magnetic conducting member 12, which is arranged in the housing 111. The magnetic conducting member 12 is provided with a receiving groove 121, and at least part of the metal coil 112 is arranged in the receiving groove 121. The slot opening 122 of the receiving groove 121 faces the pole piece 3.

[0068] The magnetic conducting member 12 is used for guiding the magnetic field generated by the metal coil 112 and making the magnetic induction lines of the magnetic field pass out of the slot opening 122 of the receiving groove 121. After the high-frequency high-voltage current is passed through the metal coil 112, the metal coil 112 generates a high-speed changing alternating magnetic field. Due to the arrangement of the magnetic conducting member 12, the magnetic induction lines of the magnetic field are uniformly reflected and guided by the magnetic conducting member 12. The magnetic induction lines uniformly reflected and guided by the magnetic conducting member 12 uniformly pass out of the slot opening 122 of the receiving groove 121, so that the electromagnetic heating device 1 generates a uniform and directional magnetic field.

[0069] In some embodiments, the shape of the magnetic conducting member 12 is adapted to the inner wall of the housing 111, so that the magnetic conducting member 12 is more fitted to the housing 111, thereby reducing the space occupied by the electromagnetic heating device 1.

[0070] In an embodiment, referring to Figure 1 and Figure 2 Along the conveying direction H1 of the pole piece, the cross-sectional area of at least part of the region of the at least one electromagnetic heating portion 11 gradually decreases.

[0071] Since the pole piece 3 and the separator 4 are synchronously fed in the roll pressing production, and there is a limitation on the feeding angle between the pole piece 3 and the separator 4, in order to make the electromagnetic heating device 1 as close as possible to the feeding roller 22 and reduce the time for the pole piece 3 to move to the feeding roller 22 after being heated, in the embodiment of the utility model, the shape of the at least one electromagnetic heating portion 11 is set as follows: along the conveying direction H1 of the pole piece, the cross-sectional area of at least part of the region of the electromagnetic heating portion 11 gradually decreases. The end of the electromagnetic heating portion 11 with smaller cross-sectional area can be close to the feeding roller 22, so that the electromagnetic heating portion 11 can be closer to the feeding roller 22 without affecting the feeding of the separator 4 and the pole piece 3. After the pole piece 3 is heated, the pole piece 3 can be more quickly pressed, the degree of temperature drop of the pole piece 3 in the feeding process is reduced, and the pressing effect of the pole piece 3 and the separator 4 is ensured.

[0072] According to the second aspect of the utility model, a hot compounding equipment 2 is provided, referring toFigure 1 , including: pole piece driving roller 21 and into the material roller 22, pole piece driving roller 21 is used to transport pole piece 3 to into the material roller 22, into the material roller 22 is used to press the diaphragm 4 and pole piece 3;The electromagnetic heating device 1 in the foregoing embodiment, the electromagnetic heating part 11 is arranged between the pole piece driving roller 21 and the material roller 22 for heating different sides of the same pole piece 3. The heat lamination equipment 2 comprises the electromagnetic heating device 1 described above, so that the heat lamination equipment 2 has all the beneficial effects of the electromagnetic heating device 1 described above, and the embodiments of the present application will not be repeated here.

[0073] In an embodiment, referring to Figure 1 and Figure 2 , the electromagnetic heating part 11 comprises a first electromagnetic heating part 11, and the first electromagnetic heating part 11 is located between the pole piece 3 and the diaphragm 4.

[0074] The first electromagnetic heating part 11 is arranged between the pole piece 3 and the diaphragm 4, making full use of the space between the pole piece 3 and the diaphragm 4, reducing the volume and installation difficulty of the heat lamination equipment 2.

[0075] In an embodiment, referring to Figure 1 and Figure 2 , the first electromagnetic heating part 11 comprises a first surface 131 facing the pole piece 3 and a second surface 132 facing the diaphragm 4;Along the conveying direction H1 of the pole piece, the distance between the first surface 131 and the second surface 132 decreases.

[0076] By controlling the distance between the first surface 131 and the second surface 132 to decrease, the first electromagnetic heating part 11 is shaped like a cone, so that the first electromagnetic heating part 11 can be more easily installed between the diaphragm 4 and the pole piece 3, and the probability of the first electromagnetic heating part 11 interfering with the pole piece 3 and the diaphragm 4 is reduced, and the safety of the heat lamination equipment 2 is improved.

[0077] In an embodiment, referring to Figure 1 and Figure 2 , the included angle between the first surface 131 and the second surface 132 is A, and 25°≤A≤40°;And / or,

[0078] The included angle between the diaphragm 4 and the pole piece 3 is B, and 25°≤B≤40°.

[0079] If the included angle of the first surface 131 and the second surface 132 is too large, the distance between the first electromagnetic heating part 11 and the diaphragm 4 and the pole piece 3 is close, and the diaphragm 4 and the pole piece 3 are easily scratched by the first electromagnetic heating part 11; if the included angle of the first surface 131 and the second surface 132 is too small, the space left for the internal parts of the first electromagnetic heating part 11 is small, which easily leads to a weak magnetic field strength and reduces the heating efficiency of the pole piece 3. Therefore, the embodiment of the utility model sets the included angle A to be between 25° and 40°, and exemplarily, A can be 25°, 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°, 35°, 36°, 37°, 38°, 39°, or 40°, which can not only reserve enough space for installing various internal parts, but also reduce the probability of the first electromagnetic heating part 11 affecting the diaphragm 4 and the pole piece 3.

[0080] It should be noted that, in the embodiments of the present application, the association relationship of the associated objects described by "and / or" represents that there can be three kinds of relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist simultaneously, and B exists alone.

[0081] In an embodiment, referring to Figure 1 , the thermal compounding device 2 further comprises a rolling roller 23, the rolling roller 23 is located downstream of the feeding roller 22 along the conveying direction H1 of the pole piece; and a temperature measuring device 24, the temperature measuring device 24 is arranged between the feeding roller 22 and the rolling roller 23, and the temperature measuring device 24 is used for measuring the temperature of the pole piece 3.

[0082] In the embodiment, the rolling roller 23 is used for further pressing the diaphragm 4 and the pole piece 3, so that the connection between the diaphragm 4 and the pole piece 3 is more close. The temperature measuring device 24 can measure the temperature of the pole piece 3, so that the staff can know the temperature of the pole piece 3 between the feeding roller 22 and the rolling roller 23 in real time, and thus the magnetic field strength of the electromagnetic heating device 1 can be adjusted in time. The temperature measuring device 24 can be an infrared thermometer, a thermocouple thermometer, etc., and the embodiment of the utility model does not make any limitation thereon.

[0083] In an embodiment, referring to Figure 1 , the thermal compounding device 2 further comprises a rolling roller 23, the rolling roller 23 is located downstream of the feeding roller 22 along the conveying direction H1 of the pole piece; and a temperature measuring device 24, the temperature measuring device 24 is arranged between the feeding roller 22 and the rolling roller 23, and the temperature measuring device 24 is used for measuring the temperature of the pole piece 3.

[0084] If the distance between the electromagnetic heating part 11 and the feeding roller 22 is too far, the pole piece 3 still needs to pass through a long distance after being heated by the electromagnetic heating part 11 to realize the compounding with the diaphragm 4, and the temperature of the pole piece 3 can be reduced in the process, which can not meet the temperature requirement when compounding, and can affect the compounding effect. Therefore, in the embodiment of the utility model, d is set to be within 30 mm, and exemplarily, can be 30 mm, 28 mm, 26 mm, 24 mm, 22 mm, 20 mm, 18 mm, 16 mm, 14 mm, 12 mm, 10 mm, 8 mm, 6 mm, 4 mm, 2 mm and the like, so that the pole piece 3 can be rapidly pressed after being heated, the compounding effect is improved, and the probability of wrinkles and bubbles is reduced.

[0085] The above has carried out the detailed introduction to the embodiment of the utility model, the principle and the implementation mode of the utility model have been described in this paper by applying specific examples, the above embodiment is only for helping understanding the method of the utility model and its core thought; simultaneously, for the technical personnel in the art, according to the thought of the utility model, in specific implementation mode and application range will have the change, the above is described, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. An electromagnetic heating device, characterized by, The electromagnetic heating device is applied to a thermal compounding device for thermally compounding a pole piece and a separator of a battery, and includes at least two electromagnetic heating portions for heating different sides of the same pole piece.

2. The electromagnetic heating device of claim 1, wherein, The distance between the two electromagnetic heating portions for heating different sides of the same pole piece and the pole piece is D, and 5mm≤D≤15mm.

3. The electromagnetic heating device of claim 1, wherein, The electromagnetic heating device includes: a shell; and a metal coil at least partially arranged in the shell to form the electromagnetic heating portions to generate a magnetic field to heat the pole piece.

4. The electromagnetic heating device of claim 3, wherein, The wire of the metal coil is a hollow wire to form a cooling medium flow channel in the wire for the flow of a cooling medium.

5. The electromagnetic heating device of claim 3, wherein, Each of the electromagnetic heating portions is provided with one metal coil; or The metal coil includes a first portion, a second portion and a third portion, the first portion and the third portion are connected to different ends of the second portion, and the first portion and the third portion are located in different electromagnetic heating portions respectively, so that at least two electromagnetic heating portions share the metal coil.

6. The electromagnetic heating device of claim 3, wherein, The electromagnetic heating device further includes a magnetic conductive member arranged in the shell, the magnetic conductive member is provided with a receiving groove, at least part of the metal coil is accommodated in the receiving groove, and the opening of the receiving groove faces the pole piece.

7. The electromagnetic heating device according to any one of claims 1 to 6, characterized in that Along the conveying direction of the pole piece, the cross-sectional area of at least part of the area of at least one electromagnetic heating portion gradually decreases.

8. A thermal compounding apparatus characterized by comprising: It includes: a pole piece driving roller for conveying a pole piece to an inlet roller, and the inlet roller is used for pressing a separator and the pole piece; The electromagnetic heating device of any one of claims 1 to 7, the electromagnetic heating portion is arranged between the pole piece driving roller and the inlet roller to heat different sides of the same pole piece.

9. The thermal compounding apparatus according to claim 8, wherein The electromagnetic heating portion includes a first electromagnetic heating portion located between the pole piece and the separator.

10. The thermal compounding apparatus according to claim 9, wherein The first electromagnetic heating portion includes a first surface facing the pole piece and a second surface facing the separator. Along the conveying direction of the pole piece, the distance between the first surface and the second surface decreases.

11. The thermal compounding apparatus according to claim 10, wherein The included angle between the first surface and the second surface is A, and 25°≤A≤40°; and / or The included angle between the separator and the pole piece is B, and 25°≤B≤40°.

12. The thermal compounding apparatus according to claim 8, wherein The thermal compounding device further includes: a rolling roller located downstream of the inlet roller along the conveying direction of the pole piece; and a temperature measuring device arranged between the inlet roller and the rolling roller, the temperature measuring device is used to measure the temperature of the pole piece.

13. The thermal compounding apparatus according to claim 8, wherein The thermal compounding device further includes a rolling roller located downstream of the inlet roller along the conveying direction of the pole piece; Wherein, along the conveying direction of the pole piece, the distance between the electromagnetic heating portion and the inlet roller is d, and d≤30mm.

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