A drying device for the production and processing of lithium battery separators

Abstract

The present invention discloses a drying device for the production and processing of lithium battery diaphragms, which relates to the technical field of lithium battery diaphragm production. The drying device includes an oven and a heater disposed in the oven for drying the diaphragm; the drying device for the production and processing of lithium battery diaphragms further includes a tension mechanism; the tension mechanism includes: a pair of tension wheels, which are rotatably connected in the oven, and the diaphragm is tensioned between the pair of tension wheels; and a control mechanism; the control mechanism is disposed between the pair of tension wheels, and the control mechanism includes a control wheel and a driving mechanism; the diaphragm is tensioned on the control wheel and the pair of tension wheels. By setting the tension wheels and the control mechanism, when the diaphragm is heated and dried, since the diaphragm is in close contact with the control wheel, at this time, when the diaphragm undergoes thermal shrinkage, it is affected by the frictional force of the control wheel in close contact with it, forming a certain hindrance to the thermal shrinkage phenomenon of the diaphragm, which can offset a part of the thermal shrinkage degree of the diaphragm and ensure the drying quality of the diaphragm.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery separator production, and particularly relates to a drying device for lithium battery separator production and processing. Background Art

[0002] In the production process of lithium battery separators, drying is a crucial step. However, during this process, due to the influence of various factors such as temperature, humidity, and mechanical movement, the separator is prone to thermal shrinkage. This can lead to defects such as physical damage, wrinkles, or irregular stripes, thus seriously affecting the performance of the separator and the quality of its final product.

[0003] In the prior art, a tension adjustment device is mostly used to apply a certain tension to the separator during drying to offset part of the thermal shrinkage of the separator during drying.

[0004] However, the existing tension structures still have the following defects during use:

[0005] 1) Most tension control systems use rollers arranged along the separator conveying direction to tension the separator to ensure that it has appropriate tension in the length direction. However, this structure provides a weak tension force in the width direction of the separator, making it difficult to effectively prevent the separator from thermally shrinking at high temperatures, thereby causing problems such as separator wrinkles and uneven thickness;

[0006] 2) The existing tension structures are insufficient in terms of reaction speed and are difficult to quickly adapt to the changes in the pulling force generated during the thermal shrinkage of the separator. For example, when the drying temperature control is inaccurate or the temperature difference is large, the separator will shrink significantly due to heat, resulting in an increase in the pulling force; at this time, the traditional tension structure cannot respond to this increased pulling force in a timely manner, affecting the product quality. Summary of the Invention

[0007] In order to overcome the above technical problems, the purpose of the present invention is to provide a drying device for lithium battery separator production and processing, which is used to solve the problem that the existing tension structure provides a weak tension force in the width direction of the separator, making it difficult to effectively prevent the separator from thermally shrinking at high temperatures, thereby affecting the quality of the separator.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A drying device for lithium battery separator production and processing, including an oven and a heater disposed in the oven for drying the separator; the drying device for lithium battery separator production and processing further includes a tension mechanism; the tension mechanism includes:

[0010] A pair of tension wheels, the tension wheels are rotatably connected in the oven, and the separator is tensioned between the pair of tension wheels;

[0011] and a control mechanism; the control mechanism is arranged between a pair of the tension wheels, and the control mechanism includes a control wheel and a driving mechanism; the control wheel is rotatably connected inside the oven, the control wheel is arranged between a pair of tension wheels, the axis of the control wheel is parallel to the axis of the tension wheel, and the diaphragm is tensioned on the control wheel and a pair of tension wheels;

[0012] The diaphragm is bent into a U-shaped structure by the control wheel and a pair of tension wheels, the heater is a flat structure, and the heater is arranged directly below the U-shaped structure; the driving mechanism is installed in the oven, and the output end of the driving mechanism is coaxially connected with the control wheel; the driving mechanism is used to drive the control wheel to rotate.

[0013] Preferably, the driving mechanism includes a motor and a mounting bracket; the motor is installed in the oven, the mounting bracket is fixedly arranged on the control wheel, and the output end of the motor is connected with the mounting bracket.

[0014] Preferably, the control mechanism further includes a temperature regulating mechanism, and the temperature regulating mechanism is arranged inside the control wheel; the temperature regulating mechanism is used to regulate the temperatures of different regions on the control wheel so as to transfer different temperatures to the diaphragm.

[0015] Preferably, the temperature regulating mechanism includes a mounting plate, a hot water pipe and a cold water pipe; the mounting plate is installed in the oven, and both the hot water pipe and the cold water pipe are installed on the mounting plate; a heat-conducting liquid for heating the control wheel is passed through the hot water pipe, and a coolant for cooling the control wheel is passed through the cold water pipe;

[0016] A heat insulator is arranged on the mounting plate, and the inlet pipe sections of the hot water pipe and the cold water pipe are both arranged inside the heat insulator; the heat insulator is used to isolate the hot water pipe and the cold water pipe so as to reduce the heat exchange between the hot water pipe and the cold water pipe.

[0017] Preferably, the projections of the hot water pipe and the cold water pipe along the axial direction of the control wheel are both fan-shaped structures, and the hot water pipe includes a first inlet section, a heating section and a first outlet section; the heating section is an S-shaped bending structure; when the heating section is projected along the axial direction of the control wheel, the distance D between the heating section and the inner wall of the control wheel gradually increases clockwise along the circumferential direction of the control wheel;

[0018] The cold water pipe includes a second inlet section, a cooling section and a second outlet section; the cooling section is an S-shaped bending structure; when the cooling section is projected along the axial direction of the control wheel, the distance H between the cooling section and the inner wall of the control wheel gradually increases clockwise along the circumferential direction of the control wheel.

[0019] Preferably, the tension mechanism further includes a buffer mechanism for adjusting the tension of the tension wheel on the diaphragm; the buffer mechanism includes a linkage mechanism, a piston, and an elastic telescopic airbag; an installation seat is arranged in the oven, a sliding groove is formed in the installation seat, the piston is slidably connected to the sliding groove, the tension wheel is arranged above the installation seat, one end of the linkage mechanism is connected to the tension wheel, and the other end of the linkage mechanism is connected to the piston; when the pressure of the diaphragm on the tension wheel changes, the tension wheel pushes the piston to lift and lower through the linkage mechanism;

[0020] A pressure chamber is formed between the bottom of the piston and the sliding groove; the inside of the elastic telescopic airbag is communicated with the pressure chamber through a communication hole.

[0021] Preferably, the linkage mechanism includes a rotating frame, a connecting rod, and a universal ball joint; the rotating frame is hinged to the installation seat, the tension wheel is rotatably connected to the rotating frame around its axis, the connecting rod is hinged to the rotating frame, and one end of the connecting rod is connected to the piston through the universal ball joint.

[0022] Preferably, the buffer mechanism further includes a detection mechanism; the detection mechanism is used for detecting the pressure received by the elastic telescopic airbag; a controller is installed in the oven, and the detection mechanism and the heater are both electrically controlled and connected to the controller; when the detection mechanism detects that the pressure is greater than a preset value, the controller is used for adjusting the heat dissipated by the heater.

[0023] Preferably, the detection mechanism includes a pressure plate and a pressure sensor, the pressure sensor is arranged in the installation seat, the pressure sensor is arranged directly below the elastic telescopic airbag, the pressure plate is arranged at the bottom of the elastic telescopic airbag, and the top of the pressure sensor abuts against the pressure plate;

[0024] A return spring is arranged in the elastic telescopic airbag; when the pressure of the diaphragm on the tension wheel decreases, the return spring is used for driving the elastic telescopic airbag to automatically contract and reset to restore the tension of the tension wheel on the diaphragm.

[0025] Preferably, a base is arranged in the oven, the heater is installed on the base; an isolation cover is arranged on the base, and the isolation cover is sleeved on the heater; the isolation cover is used for guiding the heat generated by the heater to dissipate upward.

[0026] Advantages of the present invention:

[0027] 1. By arranging the tension wheel and the control mechanism, when the diaphragm is heated and dried, since the diaphragm is in close contact with the control wheel, when the diaphragm undergoes thermal shrinkage, it is affected by the frictional force of the control wheel in close contact with it, forming a certain obstacle to the thermal shrinkage phenomenon of the diaphragm, which can offset a part of the thermal shrinkage degree of the diaphragm and ensure the drying quality of the diaphragm;

[0028] 2. Bend the diaphragm into a U-shaped structure through a pair of tension wheels and control wheels. During drying, the diaphragm is first gradually heated up and then gradually cooled down, so as to form a stable temperature gradient change, which can reduce the temperature difference during the drying process and thus improve the drying quality of the diaphragm.

[0029] 3. By setting a temperature regulating mechanism, the diaphragm is closely attached to different positions of the control wheel to form a temperature change gradient that gradually increases from left to right and downwards and gradually decreases from right to bottom and upwards, and then corresponds to the drying temperature of the diaphragm on the other side by the heater, ensuring the uniformity of heat reception on both sides of the diaphragm and improving the drying efficiency.

[0030] 4. By setting a buffer mechanism, the pulling force on the diaphragm is maintained within a certain range, preventing damage caused by excessive pulling force, realizing a rapid response to changes in the diaphragm pulling force, preventing damage caused by excessive force on the diaphragm, and being able to offset part of the shrinkage force of the diaphragm due to heat, ensuring the drying quality of the diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be further described below with reference to the accompanying drawings.

[0032] Figure 1 is a schematic perspective view of the overall first perspective of the present invention;

[0033] Figure 2 is a schematic perspective view of the overall second perspective of the present invention;

[0034] Figure 3 is a schematic perspective view of a partial cross-section of the control mechanism of the present invention;

[0035] Figure 4 is a schematic enlarged view of the main view cross-section of the control mechanism of the present invention;

[0036] Figure 5 is a schematic enlarged perspective view of a partial structure of the temperature regulating mechanism of the present invention;

[0037] Figure 6 is a schematic enlarged perspective view of the hot water pipe of the present invention;

[0038] Figure 7 is a schematic enlarged perspective view of the cold water pipe of the present invention;

[0039] Figure 8 is a schematic enlarged perspective view of a partial cross-section of the buffer mechanism of the present invention;

[0040] Figure 9 is a schematic enlarged view of the main view cross-section of the buffer mechanism of the present invention.

[0041] In the figure: 1. Base; 2. Heater; 3. Tension mechanism; 31. Tension wheel; 32. Control mechanism; 321. Control wheel; 322. Driving mechanism; 3221. Motor; 3222. Mounting bracket; 323. Temperature regulating mechanism; 3231. Mounting plate; 3232. Thermal insulator; 3233. Hot water pipe; 3234. Cold water pipe; 33. Buffer mechanism; 331. Linkage mechanism; 3311. Rotating frame; 3312. Connecting rod; 3313. Universal ball joint; 332. Piston; 333. Slide groove; 334. Elastic telescopic airbag; 335. Communication hole; 336. Detection mechanism; 3361. Pressure plate; 3362. Pressure sensor; 337. Return spring. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] As Figures 1-9 shown, a drying device for lithium battery separator production and processing includes an oven and a heater 2 disposed in the oven for drying the separator; a base 1 is disposed in the oven, and the heater 2 is installed on the base 1; an isolation cover is disposed on the base 1, and the isolation cover is sleeved on the heater 2; the isolation cover is used to guide the heat generated by the heater 2 to dissipate upward; the drying device for lithium battery separator production and processing further includes a tension mechanism 3; the tension mechanism 3 is disposed in the oven, and the tension mechanism 3 includes: a pair of tension wheels 31, the tension wheels 31 are rotatably connected in the oven, and the separator is tensioned on the pair of tension wheels 31; and a control mechanism 32; the control mechanism 32 is disposed between the pair of tension wheels 31, and the control mechanism 32 includes a control wheel 321 and a driving mechanism 322; the control wheel 321 is rotatably connected in the oven, the control wheel 321 is disposed between the pair of tension wheels 31, the axis of the control wheel 321 is parallel to the axis of the tension wheels 31, and the separator is tensioned on the control wheel 321 and the pair of tension wheels 31; the separator is bent into a U-shaped structure through the control wheel 321 and the pair of tension wheels 31, the heater 2 is a flat structure, and the heater 2 is disposed directly below the U-shaped structure; the driving mechanism 322 is installed in the oven, and the output end of the driving mechanism 322 is coaxially connected to the control wheel 321; the driving mechanism 322 is used to drive the control wheel 321 to rotate.

[0044] It should be noted that during the transportation of the lithium battery separator, a pair of tension wheels 31 and a control wheel 321 are used to tension the separator, and the control wheel 321 is driven to rotate by a driving mechanism 322, allowing the separator to be transported in close contact with the control wheel 321 without sliding friction. When the separator is heated and dried, since the separator is in close contact with the control wheel 321, when the separator undergoes thermal shrinkage, it is affected by the frictional force of the control wheel 321 in close contact with it, which forms a certain hindrance to the thermal shrinkage phenomenon of the separator. It can be understood that the material of the control wheel 321 can be quartz, and the thermal expansion coefficient of quartz is almost zero in the range of 0°C - 100°C. At this time, the drying temperature of the separator should be lower than 100°C. Therefore, when the separator is dried in close contact with the control wheel 321 made of quartz, the separator will be tightly tensioned on the control wheel 321 for drying through the cooperation of the tension wheel 31. The frictional force between the quartz and the separator can offset part of the thermal shrinkage phenomenon of the separator, ensuring the drying quality of the separator.

[0045] A pair of tension wheels 31 and a control wheel 321 are used to bend the separator into a U-shaped structure. When the separator is dried in close contact with the control wheel 321 by the heater 2, the temperature on both sides of the U-shaped structure is lower than the temperature at the bottom of the U-shaped structure. Therefore, during the transportation and drying of the separator, the separator is first gradually heated and then gradually cooled, thus forming a stable temperature gradient change, which can reduce the temperature difference during the drying process and further improve the drying quality of the separator.

[0046] As Figures 1-3 shown, it can be understood that the specific structure and installation method of the driving mechanism 322 are not limited in this application. Only a feasible technical solution is provided below; the driving mechanism 322 includes a motor 3221 and a mounting bracket 3222; the motor 3221 is installed in the oven, the mounting bracket 3222 is fixedly arranged on the control wheel 321, and the output end of the motor 3221 is connected to the mounting bracket 3222.

[0047] It should be noted that the motor 3221 drives the mounting bracket 3222 to rotate, thereby driving the control wheel 321 to rotate around its axis, enabling the separator in close contact with the control wheel 321 to be synchronously transported, that is, there is no sliding friction between the separator in close contact with the control wheel 321 and the control wheel 321.

[0048] As Figures 2-4 shown, the control mechanism 32 further includes a temperature adjustment mechanism 323, and the temperature adjustment mechanism 323 is arranged inside the control wheel 321; the temperature adjustment mechanism 323 is used to adjust the temperature of different regions on the control wheel 321 to transfer different temperatures to the separator.

[0049] It should be noted that, in order to improve the drying efficiency of the diaphragm, by setting up a temperature regulating mechanism 323, in cooperation with the control wheel 321 made of quartz material with poor thermal conductivity, a temperature change gradient is formed such that the diaphragm closely adheres to different positions of the control wheel 321, gradually increasing in temperature from left to lower right and gradually decreasing in temperature from lower right to upper right. Furthermore, it corresponds to the drying temperature of the diaphragm on the other side by the heater 2, ensuring the uniformity of heat reception on both sides of the diaphragm and achieving the purpose of improving the drying efficiency.

[0050] As Figures 3-7 shown, the temperature regulating mechanism 323 includes a mounting plate 3231, a hot water pipe 3233, and a cold water pipe 3234; the mounting plate 3231 is installed in the oven, and both the hot water pipe 3233 and the cold water pipe 3234 are installed on the mounting plate 3231; a heat-conducting liquid for heating the control wheel 321 is passed through the hot water pipe 3233, and a coolant for cooling the control wheel 321 is passed through the cold water pipe 3234; a heat insulator 3232 is provided on the mounting plate 3231, and the inlet pipe sections of the hot water pipe 3233 and the cold water pipe 3234 are both arranged inside the heat insulator 3232; the heat insulator 3232 is used to isolate the hot water pipe 3233 and the cold water pipe 3234 to reduce the heat exchange between the hot water pipe 3233 and the cold water pipe 3234, thereby ensuring the temperature control effect on the control wheel 321.

[0051] It should be noted that by introducing a heat-conducting liquid into the hot water pipe 3233, the lower left region of the control wheel 321 is heated, and by introducing a coolant into the cold water pipe 3234, the lower right region of the control wheel 321 is cooled. In this way, a temperature gradient of gradually increasing and then decreasing in temperature from left to right is formed at the position where the control wheel 321 is in close contact with the diaphragm, matching the temperature when the diaphragm is heated by the heater 2, reducing the temperature difference during diaphragm drying, and improving the diaphragm drying efficiency.

[0052] As Figures 4-7As shown in the figure, the hot water pipe 3233 and the cold water pipe 3234 are both fan-shaped structures in the projection along the axial direction of the control wheel 321. The hot water pipe 3233 includes a first introduction section, a heating section, and a first export section; the heating section is an S-shaped bending structure; when the heating section is projected along the axial direction of the control wheel 321, the distance D between the heating section and the inner wall of the control wheel 321 gradually increases clockwise along the circumferential direction of the control wheel 321; the cold water pipe 3234 includes a second introduction section, a cooling section, and a second export section; the cooling section is an S-shaped bending structure; when the cooling section is projected along the axial direction of the control wheel 321, the distance H between the cooling section and the inner wall of the control wheel 321 gradually increases clockwise along the circumferential direction of the control wheel 321; the distance D1 between the connection position of the first introduction section and the heating section and the inner wall of the control wheel 321 is less than the distance D2 between the connection position of the first export section and the heating section and the inner wall of the control wheel 321; the distance H1 between the connection position of the second introduction section and the cooling section and the inner wall of the control wheel 321 is less than the distance H2 between the connection position of the second export section and the cooling section and the inner wall of the control wheel 321.

[0053] It should be noted that through the setting of the S-shaped bending structure, the residence time of the heat-conducting liquid and the cooling liquid is increased, the heating and cooling effects are improved, and the control range of heating and cooling of the control wheel 321 is increased, so that the control wheel 321 can be heated and cooled synchronously in the length direction, ensuring the temperature uniformity of the control wheel 321 in the length direction;

[0054] Through the structural settings of the fan-shaped structures of the hot water pipe 3233 and the cold water pipe 3234 and the gradually changing distances from the inner wall of the control wheel 321, when the heat-conducting liquid and the cooling liquid are introduced, an accurate temperature gradient can be formed, making the heat received by the diaphragm from the control wheel 321 and the heat emitted by the heater 2 close to each other, ensuring uniform heating on both sides of the diaphragm, and thus improving the diaphragm drying efficiency.

[0055] As Figures 1-2 and Figure 8 shown in the figure, the tension mechanism 3 further includes a buffer mechanism 33 for adjusting the tension of the tension wheel 31 on the diaphragm; the buffer mechanism 33 includes a linkage mechanism 331, a piston 332, and an elastic telescopic airbag 334; there is a mounting seat in the oven, and a sliding groove 333 is opened on the mounting seat. The piston 332 is slidably connected to the sliding groove 333. The tension wheel 31 is arranged above the mounting seat. One end of the linkage mechanism 331 is connected to the tension wheel 31, and the other end of the linkage mechanism 331 is connected to the piston 332; when the pressure of the diaphragm on the tension wheel 31 changes, the tension wheel 31 pushes the piston 332 to move up and down through the linkage mechanism 331; a pressure chamber is formed between the bottom of the piston 332 and the sliding groove 333; the inside of the elastic telescopic airbag 334 is communicated with the pressure chamber through a communication hole 335.

[0056] It should be noted that when the drying temperature of the diaphragm is too high or the drying temperature difference is large, resulting in excessive thermal shrinkage of the diaphragm, the tension on the tension wheel 31 increases at this time. At this time, the diaphragm will pull the tension wheel 31 to drive the linkage mechanism 331 to move, drive the piston 332 to move through the linkage mechanism 331, and make the elastic telescopic airbag 334 expand under force. The expansion of the elastic telescopic airbag 334 offsets part of the tension of the diaphragm. However, when the diaphragm tension increases, the elastic telescopic airbag 334 is allowed to further expand to reduce the tension between the diaphragm and the tension wheel 31 and prevent damage to the diaphragm caused by excessive tension. When the tension of the diaphragm on the tension wheel 31 decreases, the elastic telescopic airbag 334 can automatically contract, drive the tension wheel 31 to rotate and reset, and restore the tension on the diaphragm. That is, during the change of the diaphragm tension, through the setting of the buffer mechanism 33, the tension on the diaphragm is maintained within a certain range, preventing damage caused by excessive tension, and can offset part of the shrinkage force of the diaphragm due to heat, improving the drying quality of the diaphragm.

[0057] As Figures 1-2 and Figures 8-9 shown, the linkage mechanism 331 includes a rotating frame 3311, a connecting rod 3312, and a universal ball joint 3313; the rotating frame 3311 is hinged to the mounting seat, the tension wheel 31 is rotatably connected to the rotating frame 3311 around its axis, the connecting rod 3312 is hinged to the rotating frame 3311, and one end of the connecting rod 3312 is connected to the piston 332 through the universal ball joint 3313.

[0058] It should be noted that when the pulling force of the diaphragm on the tension wheel 31 increases, the tension wheel 31 moves, drives the rotating frame 3311 to rotate, drives the connecting rod 3312 to move through the rotating frame 3311, and drives the piston 332 to move through the cooperation of the universal ball joint 3313. Then, the air in the pressure chamber is pushed into the elastic telescopic airbag 334, and the elastic telescopic airbag 334 is forced to expand, so as to reduce the pulling force of the tension wheel 31 on the diaphragm, realize a rapid response to the change of the diaphragm tension, and prevent damage to the diaphragm caused by excessive force.

[0059] As Figure 3 and Figures 8-9 shown, the buffer mechanism 33 further includes a detection mechanism 336; the detection mechanism 336 is used to detect the pressure received by the elastic telescopic airbag 334; a controller is installed in the oven, and the detection mechanism 336 and the heater 2 are both electrically controlled and connected to the controller; when the detection mechanism 336 detects that the pressure is greater than the preset value, the controller is used to adjust the heat dissipated by the heater 2; it can be understood that the controller is a prior art and is not shown in the figure and will not be elaborated in detail.

[0060] It should be noted that when the elastic expansion airbag 334 expands under force, it applies a moving pressure to the detection mechanism 336 and sends a signal to the controller. When the pressure detected by the controller is greater than the preset value, the controller controls the heater 2 and the temperature adjustment mechanism 323 to reduce the temperature, so as to reduce the degree of thermal shrinkage of the diaphragm.

[0061] As Figure 3 and Figures 8-9 shown, the detection mechanism 336 includes a pressure plate 3361 and a pressure sensor 3362. The pressure sensor 3362 is arranged in the mounting seat and is located directly below the elastic expansion airbag 334. The pressure plate 3361 is arranged at the bottom of the elastic expansion airbag 334, and the top of the pressure sensor 3362 abuts against the pressure plate 3361; a return spring 337 is arranged in the elastic expansion airbag 334; when the pressure of the diaphragm on the tension wheel 31 decreases, the return spring 337 is used to drive the elastic expansion airbag 334 to automatically contract and reset, so as to restore the tension force of the tension wheel 31 on the diaphragm; it can be understood that the pressure sensor 3362 is a prior art and will not be elaborated in detail.

[0062] It should be noted that when the elastic expansion airbag 334 expands, it pushes the pressure plate 3361 to apply pressure to the pressure sensor 3362. The pressure value is detected by the pressure sensor 3362 and transmitted to the controller, and then the tension generated during the thermal shrinkage of the diaphragm can be detected, which is convenient for quickly responding and adjusting the drying temperature of the diaphragm, and improving the product quality.

[0063] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation and specific orientation structure and operation. Therefore, it cannot be understood as a limitation to the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0064] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0065] The above has described in detail an embodiment of the present invention. However, the above content is only a preferred embodiment of the present invention and should not be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A drying device for producing and processing lithium battery diaphragms, comprising an oven and a heater (2) arranged in the oven for drying the diaphragms; characterized in that: The drying device for producing and processing lithium battery diaphragms further comprises a tension mechanism (3); the tension mechanism (3) comprises: A pair of tension wheels (31), the tension wheels (31) being rotatably connected to the oven, and the diaphragm being tensioned on the pair of tension wheels (31); and a control mechanism (32); the control mechanism (32) is arranged between the pair of tension wheels (31), and the control mechanism (32) comprises a control wheel (321) and a driving mechanism (322); the control wheel (321) is rotatably connected to the oven, the rotation axis of the control wheel (321) coincides with its axis, the control wheel (321) is arranged between the pair of tension wheels (31), the axis of the control wheel (321) is parallel to the axis of the tension wheel (31), and the diaphragm is tensioned on the control wheel (321) and the pair of tension wheels (31); The diaphragm is bent into a U-shaped structure by means of a control wheel (321) and a pair of tension wheels (31); the heater (2) is a flat plate structure, and the heater (2) is arranged directly below the U-shaped structure; the drive mechanism (322) is installed in the oven, and the output end of the drive mechanism (322) is coaxially connected to the control wheel (321); the drive mechanism (322) is used to drive the control wheel (321) to rotate.

2. A drying device for producing and processing lithium battery separators according to claim 1, characterized in that: The driving mechanism (322) comprises a motor (3221) and a mounting frame (3222); the motor (3221) is mounted on the oven, the mounting frame (3222) is fixed to the control wheel (321), and the output end of the motor (3221) is connected to the mounting frame (3222).

3. A drying device for producing and processing lithium battery separators according to claim 1, characterized in that: The control mechanism (32) further comprises a temperature regulating mechanism (323), wherein the temperature regulating mechanism (323) is arranged in the control wheel (321); the temperature regulating mechanism (323) is used to regulate the temperature of different areas on the control wheel (321), so as to control the temperatures on both sides of the diaphragm to be close to the same.

4. A drying device for producing and processing lithium battery separators according to claim 3, characterized in that: The temperature regulating mechanism (323) comprises a mounting plate (3231), a hot water pipe (3233) and a cold water pipe (3234); the mounting plate (3231) is mounted on the oven, and the hot water pipe (3233) and the cold water pipe (3234) are both mounted on the mounting plate (3231); a heat transfer liquid for heating the control wheel (321) flows through the hot water pipe (3233), and a cooling liquid for cooling the control wheel (321) flows through the cold water pipe (3234); The mounting plate (3231) is provided with a heat insulator (3232), and the inlet pipe sections of the hot water pipe (3233) and the cold water pipe (3234) are both arranged in the heat insulator (3232); the heat insulator (3232) is used to isolate the hot water pipe (3233) and the cold water pipe (3234) to reduce heat exchange between the hot water pipe (3233) and the cold water pipe (3234).

5. A drying device for producing and processing lithium battery separators according to claim 4, characterized in that: The hot water pipe (3233) and the cold water pipe (3234) are both fan-shaped structures when projected along the axis direction of the control wheel (321); the hot water pipe (3233) comprises a first inlet section, a heating section and a first outlet section; the heating section is an S-shaped curved structure; when the heating section is projected along the axis direction of the control wheel (321), the distance D between the heating section and the inner wall of the control wheel (321) gradually increases clockwise along the circumference of the control wheel (321); The cold water pipe (3234) comprises a second inlet section, a cooling section and a second outlet section; the cooling section is an S-shaped curved structure; when the cooling section is projected along the axial direction of the control wheel (321), the distance H between the cooling section and the inner wall of the control wheel (321) gradually increases clockwise along the circumference of the control wheel (321).

6. A drying device for producing and processing lithium battery separators according to claim 1, characterized in that: The tension mechanism (3) further comprises a buffer mechanism (33) for adjusting the tensioning force of the tension wheel (31) on the diaphragm; the buffer mechanism (33) comprises a linkage mechanism (331), a piston (332) and an elastic telescopic airbag (334); a mounting seat is arranged in the oven, a slide groove (333) is provided on the mounting seat, the piston (332) is slidably connected to the slide groove (333), the tension wheel (31) is arranged above the mounting seat, one end of the linkage mechanism (331) is connected to the tension wheel (31), and the other end of the linkage mechanism (331) is connected to the piston (332); when the pressure of the diaphragm on the tension wheel (31) changes, the tension wheel (31) pushes the piston (332) to rise and fall through the linkage mechanism (331); A pressure chamber is formed between the bottom of the piston (332) and the slide groove (333); the interior of the elastic telescopic airbag (334) is connected to the pressure chamber via a connecting hole (335).

7. A drying device for producing and processing lithium battery separators according to claim 6, characterized in that: The linkage mechanism (331) comprises a rotating frame (3311), a connecting rod (3312), and a universal ball joint (3313); the rotating frame (3311) is hinged to a mounting seat, the tension wheel (31) is connected to the rotating frame (3311) by rotating around its axis, the connecting rod (3312) is hinged to the rotating frame (3311), and one end of the connecting rod (3312) is connected to the piston (332) via a universal ball joint (3313).

8. A drying device for producing and processing lithium battery separators according to claim 7, characterized in that: The buffer mechanism (33) further comprises a detection mechanism (336); the detection mechanism (336) is used to detect the pressure exerted on the elastic telescopic airbag (334); a controller is installed in the oven, and the detection mechanism (336) and the heater (2) are both connected to the controller via electrical control; when the detection mechanism (336) detects that the pressure is greater than a preset value, the controller is used to adjust the amount of heat emitted by the heater (2).

9. A drying device for producing and processing lithium battery separators according to claim 8, characterized in that: The detection mechanism (336) comprises a pressure plate (3361) and a pressure sensor (3362); the pressure sensor (3362) is arranged in the mounting seat; the pressure sensor (3362) is arranged directly below the elastic telescopic airbag (334); the pressure plate (3361) is arranged at the bottom of the elastic telescopic airbag (334); and the top of the pressure sensor (3362) is in contact with the pressure plate (3361); A return spring (337) is arranged in the elastic telescopic airbag (334); when the pressure of the diaphragm on the tension wheel (31) decreases, the return spring (337) is used to drive the elastic telescopic airbag (334) to automatically contract and return to its original position, so as to restore the tensioning force of the tension wheel (31) on the diaphragm.

10. A drying device for producing and processing lithium battery separators according to claim 1, characterized in that: A base (1) is provided in the oven, and the heater (2) is mounted on the base (1); an isolation cover is provided on the base (1), and the isolation cover is sleeved on the heater (2); the isolation cover is used to guide the heat generated by the heater (2) to dissipate upwards.

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