Drying device and lithium battery diaphragm preparation device

Abstract

The utility model discloses a drying device and a lithium battery diaphragm preparation device. The drying device comprises a guide mechanism (1); the sliding block (2) is in sliding connection with the guide mechanism (1) and can slide in the length direction of the guide mechanism (1); one end of the supporting frame (3) is connected with the sliding block (2); the dryer (4) is installed at the other end of the supporting frame (3), and the sliding block is used for driving the dryer (4) to move, so that the dryer (4) dries the edge of the lithium battery diaphragm. The drying device can directly dry the edge of the lithium battery diaphragm, dichloromethane on the edge of the lithium battery diaphragm can be evaporated through drying, the quality of the lithium battery diaphragm is improved, the edge of the lithium battery diaphragm does not need to be cut, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of mechanical manufacturing, and in particular to a drying device and a lithium battery separator preparation device. Background Technology

[0002] In the wet-process manufacturing of lithium-ion battery separators, the first step is to stretch the separator, typically on a horizontal stretching machine where it is held in place by chain clamps for lateral stretching. However, due to the clamping action, marks are left on both sides of the separator, and these areas are not stretched uniformly, resulting in a thicker thickness.

[0003] Next is the extraction process. After the membrane is stretched using a stretching machine, an extraction process is performed to remove the pore-forming agent from the membrane. After extraction, the membrane enters the drying process. The drying process involves drying the extracted membrane to evaporate the dichloromethane solvent from the pores, thereby obtaining a well-pored membrane.

[0004] Drying processes typically employ two methods: temperature-controlled roller contact drying and chain clamp-held hot air drying. However, both methods suffer from a problem: the edges of the diaphragm are difficult to dry completely. For example, in chain clamp-held hot air drying, the edges of the diaphragm are completely blocked by the chain clamps, preventing the hot air from making sufficient contact and thus hindering complete drying.

[0005] To address the issue of uneven drying in lithium-ion battery separators, some technologies remove incompletely dried edges after the drying process. Removing these edges ensures uniform separator thickness, thus improving overall performance. However, edge removal increases production costs, and even after removing the edges, trace amounts of dichloromethane may remain, potentially affecting the separator's performance and safety. The primary function of a lithium-ion battery separator is to insulate the positive and negative electrodes to prevent short circuits and, through its pore-closing function, prevent contact between the electrodes in cases of overcharging or temperature increases. Residual dichloromethane on the separator may reduce its insulation performance and safety. Summary of the Invention

[0006] (I) Purpose of the utility model

[0007] The purpose of this invention is to provide a drying device and a preparation device for lithium battery separators. The drying device can directly dry the edges of the lithium battery separator. The drying process can evaporate the dichloromethane from the edges of the lithium battery separator, thereby improving the quality of the lithium battery separator. Furthermore, it eliminates the need to cut the edges of the lithium battery separator, thus reducing production costs.

[0008] (II) Technical Solution

[0009] To address the aforementioned problems, the first aspect of the present invention provides a drying device, comprising: a guiding mechanism; a slider slidably connected to the guiding mechanism and capable of sliding along the length direction of the guiding mechanism; a support frame, one end of which is connected to the slider; and a dryer installed at the other end of the support frame, wherein the slider is used to drive the dryer to move, thereby drying the edge of the lithium battery separator.

[0010] Preferably, the guiding mechanism includes: at least two guide rods and a ball screw disposed between the two guide rods; a slider is sleeved outside the at least two guide rods and the ball screw, and the slider is fixedly connected to the ball screw.

[0011] Preferably, the guiding mechanism further includes: a cable chain, a first cable chain frame, and a second cable chain frame; one end of the cable chain is installed in the first cable chain frame, and the other end is bent with its side detachably connected to the support frame via the second cable chain frame.

[0012] Preferably, the device further includes a hand crank, one side of which is connected to one end of the ball screw, for rotating the ball screw and causing the slider to slide along the length of the ball screw.

[0013] Preferably, the device further includes a position indicator disposed between the hand crank and the ball screw.

[0014] Preferably, the dryer includes an infrared emitting source and an infrared radiation source; the infrared radiation source is used to radiate infrared rays generated by the infrared emitting source onto the edge of the lithium battery separator to dry the edge of the lithium battery separator.

[0015] Preferably, the infrared radiation source is also equipped with a heat insulation plate.

[0016] Preferably, the dryer further includes an exhaust gas recovery device for recovering exhaust gas generated during the drying of the edge of the lithium battery separator.

[0017] According to a second aspect of the present invention, a lithium battery separator preparation apparatus is also provided, comprising: a drying chamber and a drying device provided in the first aspect; the drying device is disposed at the outlet of the drying chamber, and the dryer of the drying device faces the edge of the lithium battery separator that moves out of the outlet of the drying chamber.

[0018] The device also includes a temperature control roller, which has a circulating heat exchange medium inside and is used to exchange heat with the lithium battery separator.

[0019] (III) Beneficial Effects

[0020] The drying device provided by this utility model can directly dry the edge of the lithium battery separator, evaporate the dichloromethane on the edge of the lithium battery separator, improve the quality of the lithium battery separator, and eliminate the need to cut the edge of the lithium battery separator, thus reducing production costs. Attached Figure Description

[0021] Figure 1 A schematic diagram of the drying device provided in the first embodiment of this utility model;

[0022] Figure 2 This is a cross-sectional view of the slider;

[0023] Figure 3 This is a schematic diagram of the lithium battery separator preparation apparatus provided in the second embodiment of this utility model.

[0024] Figure label:

[0025] 1: Guiding mechanism; 11: Guide rod; 12: Ball screw; 13: Cable drag chain; 14: First cable drag chain frame; 15: Second cable drag chain frame; 16: Connecting plate; 2: Slider; 3: Support frame; 4: Dryer; 41: Infrared emission source; 42: Infrared radiation source; 421: Heat insulation plate; 43: Exhaust gas recovery device; 5: Hand crank; 6: Position indicator; 7: Bracket; 8: Temperature control roller. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0027] The accompanying drawings illustrate a layer structure according to an embodiment of the present invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The various regions, shapes of components, and their relative sizes and positional relationships shown in the drawings are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0028] In the description of this invention, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Many specific details of the invention, such as the structure, materials, dimensions, processing techniques, and methods of the devices, are described below to provide a clearer understanding of the invention. However, as those skilled in the art will understand, the invention may be implemented without following these specific details. Unless specifically indicated below, the various parts of the following devices may be made of materials known to those skilled in the art.

[0031] Figure 1 This is a schematic diagram of the drying device provided in the first embodiment of the present invention, as shown below. Figure 1 As shown, the drying device includes: a guide mechanism 1, a slider 2, a support frame 3, and a dryer 4.

[0032] The slider 2 is mounted on the guide mechanism 1 and is slidably connected to the guide mechanism 1, and can slide along the length direction of the guide mechanism 1.

[0033] The support frame 3 is connected to the slider 2 at one end and the dryer 4 is installed at the other end.

[0034] Dryer 4 is installed at the other end of support frame 3, wherein slider 2 is used to drive dryer 4 to move, so that dryer 4 dries the edge of lithium battery separator.

[0035] Optionally, the support frame 3 can be bent at one end along its length to form an "L" shape (see reference). Figure 1 The support frame 3 can be made of metal, acrylic, plastic, rubber, or other materials, but this embodiment is not limited to these shapes.

[0036] Optionally, the support frame 3 can be detachably connected to the slider 2, for example by bolts or by adhesive.

[0037] The dryer 4 can also be detachably mounted on the other end of the support frame 3, for example by bolt connection or glue bonding.

[0038] The dryer 4 can also be movably mounted on the other end of the support frame 3, for example, by connecting it to the other end of the support frame 3 via a swivel joint, so that the dryer 4 can rotate relative to the end of the support frame 3.

[0039] The drying device provided in this embodiment of the utility model can directly dry the edge of the lithium battery separator using a dryer, which can evaporate the dichloromethane on the edge of the lithium battery separator, improve the quality of the lithium battery separator, and eliminate the need to cut the edge of the lithium battery separator, thus reducing production costs.

[0040] Figure 2This is a cross-sectional view of the slider taken perpendicular to the direction of slider movement; such as... Figure 2 As shown, the guide mechanism 1 includes: at least two guide rods 11 and a ball screw 12 disposed between the two guide rods 11; the slider 2 is sleeved on the at least two guide rods 11 and the ball screw 12, and the slider 2 is fixedly connected to the ball screw 12.

[0041] There can be multiple guide rods 11, and ball screws 12 are arranged among the multiple guide rods 12. Optionally, when the number of guide rods 11 is even, the ball screw 12 is arranged in the exact middle of the even number of guide rods 11 to maintain balance.

[0042] In one embodiment, the end of the support frame 3 connected to the slider 2 has a base, and the slider 2 is connected to the base of the support frame 3 through a connecting plate 16.

[0043] In one embodiment, the guide mechanism 1 further includes: a cable chain 13, a first cable chain frame 14, and a second cable chain frame 15; one end of the cable chain 13 is installed in the first cable chain frame 14, and the other end is bent and the side of the end is detachably connected to the support frame 3 through the second cable chain frame 15.

[0044] In one embodiment, the first cable chain frame 14 is elongated and has a groove inside. The width of the groove is the same as or slightly larger than the width of the cable chain 13, so as to accommodate the cable chain 13.

[0045] In one embodiment, the length of the first cable carrier 14 is greater than or equal to the length of the cable 13, which allows the cable 13 to be fully accommodated when it is fully extended.

[0046] In one embodiment, the first cable carrier 14, the guide rod 11, and the ball screw 12 are of the same length.

[0047] In one embodiment, the second cable carrier 15 may be in the shape of an "L" of angle steel, with one end connected to one end of the cable carrier 13 and the other end connected to the support frame 3.

[0048] In one embodiment, the second cable carrier 15 and the support frame 3 can be connected by bolts and nuts, or by threaded holes.

[0049] In one embodiment, the drying device further includes a hand crank 5, one side of which is connected to one end of the ball screw 12, for rotating the ball screw 12 and causing the slider to slide along the length of the ball screw 12.

[0050] In this embodiment, the ball screw can be driven to rotate by manually turning the hand crank 5. The ball screw 12 can convert rotational motion into linear motion. When the hand crank 5 rotates, the ball screw 12 rotates, and the screw nut moves along the screw axis, thereby driving the slider to move along the length direction of the guide mechanism.

[0051] In one embodiment, the hand crank can be connected to the ball screw 12 via a coupling or gear drive.

[0052] The drying device provided in this embodiment moves the dryer by a hand crank, which can adapt to different diaphragm widths, more precisely remove incompletely dried dead corners, achieve better drying effect, and is easy for technicians to operate.

[0053] In one embodiment, the drying device further includes a position indicator 6 disposed between the hand crank 5 and the ball screw 12, wherein the position indicator 6 is used to indicate the distance the slider has moved. For example, the position indicator 6 is used to synchronously record how many revolutions the hand crank 5 and the ball screw 12 have made. For instance, if the hand crank 5 drives the ball screw to rotate 100 revolutions, the position indicator will record 100 revolutions. Those skilled in the art can determine the position of the slider based on the screw pitch.

[0054] In one specific embodiment, the lead screw pitch is 1mm, and the slider travels 1cm when the position indicator rotates 100 times.

[0055] In one embodiment, the dryer 4 is an infrared dryer, wherein the dryer 4 includes an infrared emitting source 41 and an infrared radiation source 42.

[0056] The infrared radiation source 42 is used to radiate infrared rays generated by the infrared emission source 41 onto the edge of the lithium battery separator in order to dry the edge of the lithium battery separator.

[0057] In one embodiment, the infrared emitting source 41 is a resistance wire.

[0058] In one embodiment, an insulation plate 421 is also provided on the infrared radiation source 42. The insulation plate 421 is used to prevent heat from being conducted to other locations, thus preventing other components from overheating and damaging the structure.

[0059] In this embodiment, the dryer 4 is an infrared dryer, which uses direct radiation heating to quickly raise the temperature and achieve the drying effect on the edges. Infrared heating is highly efficient, has little energy loss, and provides more uniform heating.

[0060] In one embodiment, the dryer further includes an exhaust gas recovery device 43 for recovering exhaust gas generated during the drying of the lithium battery separator edge. The exhaust gas recovery device 43 may include a gas collection hood, a suction device, and an exhaust gas treatment device. The opening of the gas collection hood faces the edge of the lithium battery separator, allowing the suction device to draw the exhaust gas generated during drying of the lithium battery separator edge into the exhaust gas treatment device. The exhaust gas treatment device can recover dichloromethane from the exhaust gas, reducing the exhaust gas level below emission standards before discharge. This reduces the dichloromethane generated during the drying process, preventing excessive dichloromethane levels from affecting the environment and the health of technicians.

[0061] Optionally, the exhaust gas treatment device of the exhaust gas recovery device 43 may include an absorption layer that can adsorb dichloromethane generated at the edge of the lithium battery separator.

[0062] In this embodiment, a tail gas recovery device 43 is provided, which can recover the tail gas generated at the edge of the dry lithium battery separator, thereby avoiding tail gas pollution of the environment and harm to the health of technicians.

[0063] In one embodiment, the drying device can be fixed to other equipment via a bracket 7.

[0064] In another embodiment of the present invention, a lithium battery separator preparation apparatus is provided, comprising: a drying chamber and the drying device provided in the first aspect above; wherein the drying device is disposed at the outlet of the drying chamber, and the dryer of the drying device faces the edge of the lithium battery separator that moves out from the outlet of the drying chamber.

[0065] Figure 3 This is a schematic diagram of the lithium battery separator preparation apparatus provided in the second embodiment of this utility model. Figure 3 As shown, the device also includes a temperature control roller 8, which has a circulating heat exchange medium inside. The temperature control roller is used to exchange heat with the lithium battery separator.

[0066] In this embodiment, the temperature control roller is equipped with a circulating heat exchange medium that can remove excess heat from the lithium battery separator, preventing the separator from becoming too hot and causing danger.

[0067] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

[0068] The present invention has been described above with reference to embodiments thereof. However, these embodiments are merely illustrative and not intended to limit the scope of the invention. The scope of the invention is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of the invention, and all such substitutions and modifications should fall within the scope of the invention.

Claims

1. A drying apparatus, characterized in that, include: Guiding mechanism (1); The slider (2) is slidably connected to the guide mechanism (1) and can slide along the length direction of the guide mechanism (1); The support frame (3) is connected at one end to the slider (2); A dryer (4) is installed at the other end of the support frame (3), wherein the slider is used to drive the dryer (4) to move so that the dryer (4) dries the edge of the lithium battery separator.

2. The apparatus according to claim 1, characterized in that, The guiding mechanism (1) includes: at least two guide rods (11) and a ball screw (12) disposed between the two guide rods (11); The slider (2) is sleeved on at least two of the guide rods and the ball screw (12), and the slider (2) is fixedly connected to the ball screw (12).

3. The apparatus according to claim 2, characterized in that, The guiding mechanism (1) further includes: a cable chain (13), a first cable chain frame (14), and a second cable chain frame (15); One end of the cable chain (13) is installed in the first cable chain frame (14), and the other end is bent and the side of the end is detachably connected to the support frame (3) through the second cable chain frame (15).

4. The apparatus according to claim 2 or 3, characterized in that, The device also includes: A hand crank (5) is connected to one end of the ball screw (12) and is used to drive the ball screw (12) to rotate after rotation, and to drive the slider to slide along the length direction of the ball screw (12).

5. The apparatus according to claim 4, characterized in that, The device also includes: A position indicator (6) is disposed between the hand crank (5) and the ball screw (12).

6. The apparatus according to claims 1-3 or 5, characterized in that, The dryer (4) includes an infrared emitting source (41) and an infrared radiation source (42); The infrared radiation source (42) is used to radiate infrared rays generated by the infrared emission source (41) onto the edge of the lithium battery separator to dry the edge of the lithium battery separator.

7. The apparatus according to claim 6, characterized in that, The infrared radiation source (42) is also equipped with a heat insulation plate (421).

8. The apparatus according to claims 1-3, 5 or 7, characterized in that, The dryer further includes a tail gas recovery device (43), which is used to recover the tail gas generated during the drying of the edge of the lithium battery separator.

9. A lithium battery separator preparation apparatus, characterized in that, include: Drying oven and drying apparatus as described in any one of claims 1-8; The drying device is located at the outlet of the drying chamber, and the dryer of the drying device faces the edge of the lithium battery separator that moves out of the outlet of the drying chamber.

10. The apparatus according to claim 9, characterized in that, The device further includes: Temperature control roller (8), the temperature control roller (8) is provided with a circulating heat exchange medium inside, the temperature control roller is used to exchange heat with the lithium battery separator.

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