Extrusion type coating device applied to lithium battery production

Abstract

The utility model provides an extrusion type coating device applied to lithium battery production, and relates to the technical field of lithium battery production, the extrusion type coating device comprises a base, a coating box arranged at the top of the base, a material conveying mechanism, a drying mechanism and a pressing mechanism, the limiting mechanism comprises a box body arranged on the top of the base and located on one side of the input end of the coating box, lead screws rotationally arranged on the two sides of the box body, a movable seat arranged on the rod walls of the lead screws in a threaded mode and slidably connected with the top of the base and a limiting frame arranged on the top of the movable seat, and a driving part used for driving the two lead screws to rotate at the same time is arranged in the box body. According to the battery pole piece coating device, the two sides of a conveyed battery pole piece can be blocked and limited, the situation that follow-up coating is affected by shaking and displacement of the battery pole piece is prevented, the edge of the coated and heated battery pole piece can be extruded, the edge of the battery pole piece is prevented from bulging, and therefore the quality of the battery pole piece can be improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production technology, and more specifically, to an extrusion coating device used in lithium battery production. Background Technology

[0002] Lithium-ion batteries have been widely used in numerous mobile devices in defense, industry, and civilian sectors due to their advantages such as high energy density, small size, long lifespan, and low self-discharge. In recent years, with the development of the manufacturing industry, the lithium-ion production process has gradually become more streamlined and automated. Among these processes, the coating of lithium battery electrodes mostly uses extrusion coating heads because this type of coating equipment has high coating efficiency.

[0003] Because the current battery electrode sheets are thin, they are prone to shaking and shifting during the coating process, which affects the uniformity of the coating. After the electrode sheets are coated, they are usually dried by blowing hot air onto them. However, the hot air can blow away the polymer coated on the battery electrode sheets, affecting the quality of the electrode sheets. In addition, after drying, bulging may occur at the edges of the electrode sheets, which can easily lead to tape breakage during the electrode sheet winding process. Utility Model Content

[0004] The purpose of this invention is to address the problems of existing extrusion coating devices used in lithium battery production, which cannot stably transport battery electrodes and cannot prevent bulging at the edges of coated battery electrodes during drying.

[0005] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0006] An extrusion coating apparatus for lithium battery production includes a base, a coating box disposed on top of the base, and a material conveying mechanism. The coating box has an inlet on one side and an outlet on the other side. A coating mechanism is located inside the coating box. The apparatus also includes:

[0007] The limiting mechanism includes a box body located on the top of the base on one side of the coating box input end, lead screws rotatably disposed on both sides of the box body, a movable seat threaded on the wall of the lead screws and slidably connected to the top of the base, and a limiting frame disposed on the top of the movable seat. The box body is provided with a driving component for driving the two lead screws to rotate simultaneously.

[0008] A drying mechanism is located on the top of the base on one side of the coating box output end, and is used to dry the coated battery electrode sheets.

[0009] A pressing mechanism is located on the top of the base on one side of the coating box output end, and is used to press the edge of the dried battery electrode sheet.

[0010] As a preferred technical solution of this application, the driving component includes a throttle handle rotatably disposed on the side wall of the housing, an active bevel gear disposed at one end of the throttle handle located inside the housing, and a driven bevel gear disposed at one end of the lead screw located inside the housing.

[0011] As a preferred technical solution of this application, the top of the limiting frame is provided with a pressing component. The pressing component includes a support cylinder disposed on the top of the limiting frame, a pressure column slidably disposed inside the support cylinder and extending downward into the limiting frame, a spring disposed between the top of the pressure column and the inner top wall of the support cylinder, and a pressure pad disposed at the bottom of the pressure column.

[0012] As a preferred technical solution of this application, the drying mechanism includes first supports symmetrically arranged on both sides of the top of the base, and an electric heating plate disposed between the two first supports.

[0013] As a preferred technical solution of this application, the pressing mechanism includes second supports symmetrically arranged on both sides of the top of the base, a roller and a pressure cylinder rotatably arranged between the two second supports, and an adjustment component arranged on the second supports for controlling the displacement of the pressure cylinder relative to the roller.

[0014] As a preferred technical solution of this application, the adjustment assembly includes a screw rotatably disposed on the top of the second bracket, an adjustment block slidably disposed on the side wall of the second bracket and threadedly connected to the screw, and the rotation shaft of the pressure cylinder passes through the second bracket and is rotatably connected to the adjustment block.

[0015] As a preferred technical solution of this application, the material feeding mechanism includes a third bracket symmetrically arranged on both sides of the top edge of the base, a drive feeding roller rotatably arranged between two third brackets located on one side of the coating box input end, and a drive receiving roller rotatably arranged between two third brackets located on one side of the coating box output end.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. The feeding mechanism transports battery electrodes to the coating box, where they are coated with a coating agent. Simultaneously, a limiting mechanism, when the handle is rotated, moves the limiting frames on both sides of the base via the driving bevel gear, driven bevel gear, lead screw, and moving seat, gradually bringing them closer to the sides of the battery electrodes. This limits and blocks the electrodes, ensuring stable transport. Furthermore, a pressing component slightly presses the edges of the electrodes passing through the limiting frames, keeping them taut during transport and preventing them from shifting due to looseness. This further improves the stability of electrode transport and solves the problem in existing technologies where electrode shifting during transport affects subsequent coating processes.

[0018] 2. Through the drying mechanism, after the battery electrode is coated in the coating box and output, the electric heating plate can be activated to heat and dry the upper and lower surfaces of the battery electrode. This prevents the polymer coated on the electrode from being blown away by the hot air. In addition, by setting up the pressing mechanism, the edges of the dried electrode can be squeezed to keep the edges of the electrode in a pressed state, which solves the problem of bulging edges of the electrode after drying in the prior art. Attached Figure Description

[0019] Figure 1 This is an overall structural diagram of the present invention;

[0020] Figure 2 This is another structural view of the present invention;

[0021] Figure 3 This is an exploded structural diagram of the limiting mechanism and the extrusion component of this utility model;

[0022] Figure 4 This is a structural diagram of the drive component of this utility model;

[0023] Figure 5 For the present utility model Figure 1 Enlarged structural diagram at point A in the middle;

[0024] Figure 6 For the present utility model Figure 2 Enlarged structural diagram at point B in the middle.

[0025] The image shows:

[0026] 1. Base; 101. Box body; 2. Coating box; 3. Material feeding mechanism; 301. Feeding roller; 302. Receiving roller; 4. Limiting mechanism; 401. Lead screw; 402. Moving seat; 403. Limiting frame; 5. Driving component; 501. Rotary handle; 502. Driving bevel gear; 503. Driven bevel gear; 6. Extrusion component; 601. Support cylinder; 602. Pressure column; 603. Pressure pad; 604. Spring; 7. Drying mechanism; 701. First support; 702. Electric heating plate; 8. Pressing mechanism; 801. Second support; 802. Roller; 803. Pressure cylinder; 804. Screw; 805. Adjusting block. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0028] like Figure 1 and Figure 2 As shown, this embodiment proposes an extrusion coating device for lithium battery production, including a base 1, a coating box 2 disposed on the top of the base 1, and a material conveying mechanism 3. The coating box 2 has an inlet on one side and an outlet on the other side. The coating box 2 is equipped with a coating mechanism inside, and also includes a limiting mechanism 4, a drying mechanism 7, and a pressing mechanism 8. The limiting mechanism 4 is disposed on the top of the base 1 on the side of the coating box 2 at the input end, and is used to block and limit the conveyed battery electrode sheet. The drying mechanism 7 is disposed on the top of the base 1 on the side of the coating box 2 at the output end, and is used to dry the coated battery electrode sheet. The pressing mechanism 8 is disposed on the top of the base 1 on the side of the coating box 2 at the output end, and is used to press the edge of the dried battery electrode sheet.

[0029] When coating is required on the battery electrode sheets, the electrode sheets are first conveyed to the coating box 2 by the feeding mechanism 3. Then, the coating mechanism in the coating box 2 applies polymer to the upper and lower surfaces of the battery electrode sheets to complete the coating process. Simultaneously, the limiting mechanism 4 blocks and limits the two sides of the battery electrode sheets, ensuring stable conveying and preventing shaking or deviation, thus improving the uniformity of the coating. The feeding mechanism 3 then continues to output the coated battery electrode sheets from the coating box 2, and then... The drying mechanism 7 can heat and dry the upper and lower surfaces of the output battery electrode. Compared with the hot air drying method in the prior art, the electric heating drying method of this application can prevent the polymer coated on the surface of the battery electrode from being blown away, thereby improving the coating effect of the battery electrode. In addition, the pressing mechanism 8 can also squeeze the edges on both sides of the dried battery electrode to prevent the edge of the dried battery electrode from bulging and avoid the problem of tape breakage when the battery electrode is wound up, thereby improving the quality of the battery electrode coating process.

[0030] The material feeding mechanism 3 includes a third bracket symmetrically arranged on both sides of the top edge of the base 1, a drive unloading roller 301 rotatably arranged between two third brackets located on one side of the input end of the coating box 2, and a drive take-up roller 302 rotatably arranged between two third brackets located on one side of the output end of the coating box 2. The winding end of the battery electrode is bypassed by the drive unloading roller 301, passes through the coating box 2 and connects to the drive take-up roller 302. Then, the drive unloading roller 301 and the drive take-up roller 302 are started simultaneously to convey and wind up the battery electrode.

[0031] Specifically, such as Figure 3 and Figure 4As shown, in a preferred embodiment, based on the above method, the limiting mechanism 4 further includes a box body 101 disposed on the top of the base 1 on the side of the input end of the coating box 2, a lead screw 401 rotatably disposed on both sides of the box body 101, a movable seat 402 threaded on the wall of the lead screw 401 and slidably connected to the top of the base 1, and a limiting frame 403 disposed on the top of the movable seat 402. The box body 101 is provided with a driving component 5 for driving the two lead screws 401 to rotate simultaneously.

[0032] The drive component 5 includes a throttle 501 rotatably disposed on the side wall of the housing 101, a drive bevel gear 502 disposed on the end of the throttle 501 located inside the housing 101, and a driven bevel gear 503 disposed on the end of the lead screw 401 located inside the housing 101.

[0033] When the battery electrode sheets are being transported and coated, the operator can turn the handle 501 to drive the drive bevel gear 502 to rotate. The drive bevel gear 502 can drive the two lead screws 401 with driven bevel gears 503 to rotate. The two lead screws 401 will then drive the two limiting frames 403 to move relative to each other and gradually approach each other through the moving seat 402, so that the two limiting frames 403 contact the two sides of the battery electrode sheet, blocking and supporting the two sides of the battery electrode sheet, preventing the battery electrode sheet from shaking or shifting during the transport process, which would affect the uniformity of the subsequent coating.

[0034] In addition, the top of the limiting frame 403 is provided with a pressing component 6. The pressing component 6 includes a support cylinder 601 disposed on the top of the limiting frame 403, a pressure column 602 slidably disposed inside the support cylinder 601 and extending downward into the limiting frame 403, a spring 604 disposed between the top of the pressure column 602 and the inner top wall of the support cylinder 601, and a pressure pad 603 disposed at the bottom of the pressure column 602. Moreover, when the limiting frame 403 contacts the two sides of the battery electrode, the spring 604 can drive the pressure column 602 to slide downward and make the pressure pad 603 abut against the edge of the surface of the battery electrode. Because the elastic force of the spring 604 is limited, the pressure pad 603 will not crush the battery electrode. At this time, when the battery electrode is transported, it will be in a taut state due to the slight compression of the pressure pad 603, preventing the battery electrode from shaking due to loosening, and further improving the stability of the battery electrode during transport.

[0035] like Figure 2 and Figure 6 As shown, in a preferred embodiment, based on the above method, the drying mechanism 7 further includes a first bracket 701 symmetrically arranged on both sides of the top of the base 1, and an electric heating plate 702 arranged between the two first brackets 701. The first bracket 701 is also provided with a battery and a power switch that are signal-connected to the electric heating plate 702.

[0036] After the battery electrode is coated in the coating box 2, it will be output through the outlet of the coating box 2 and pass through two electric heating plates 702. Then, the electric heating plates 702 are activated by the power switch set on the first bracket 701, so that the upper and lower surfaces of the battery electrode can be heated and dried. Compared with the hot air heating method in the prior art, this application can avoid blowing away the polymer coated on the surface of the battery electrode, thereby improving the quality of the battery electrode.

[0037] like Figure 1 and Figure 5 As shown, in a preferred embodiment, based on the above method, the pressing mechanism 8 further includes a second bracket 801 symmetrically arranged on both sides of the top of the base 1, a roller 802 and a pressure cylinder 803 rotatably arranged between the two second brackets 801, and an adjustment component arranged on the second brackets 801 for controlling the displacement of the pressure cylinder 803 relative to the roller 802.

[0038] The adjustment assembly includes a screw 804 rotatably mounted on the top of the second bracket 801, an adjustment block 805 slidably mounted on the side wall of the second bracket 801 and threadedly connected to the screw 804, and the rotation shaft of the pressure cylinder 803 passes through the second bracket 801 and is rotatably connected to the adjustment block 805.

[0039] After the battery electrode passes through the two electric heating plates 702, the edges on both sides of the battery electrode also pass between the pressure cylinder 803 and the roller 802. Then, by rotating the screw 804 and adjusting the block 805, the pressure cylinder 803 can be moved downward, so that the pressure cylinder 803 and the roller 802 abut against the upper and lower edges of the battery electrode. When the battery electrode is conveyed through the pressure cylinder 803 and the roller 802, the friction will cause the pressure cylinder 803 and the roller 802 to rotate, thereby squeezing the edges on both sides of the battery electrode to prevent the edges from bulging after the battery electrode is heated, thus avoiding breakage during subsequent conveying and winding.

[0040] The working principle of this utility model is as follows: When the battery electrode sheet needs to be coated, the electrode sheet is first transported to the coating box 2 by the feeding mechanism 3. Then, the coating mechanism in the coating box 2 applies the polymer to the upper and lower surfaces of the battery electrode sheet to complete the coating process. At the same time, the operator can turn the handle 501, which drives the two lead screws 401 equipped with driven bevel gears 503 to rotate through the active bevel gear 502. The two lead screws 401 will then drive the two limiting frames 403 to move closer to each other through the moving seat 402, so that the two… The limiting frame 403 contacts both sides of the battery electrode sheet, blocking and supporting the sides of the battery electrode sheet to prevent it from shaking or shifting during transportation, which would affect the uniformity of subsequent coating. Additionally, the spring 604 can drive the pressure column 602 downwards, causing the pressure pad 603 to abut against the edge of the battery electrode sheet surface. At this time, the battery electrode sheet is slightly compressed by the pressure pad 603 during transportation, keeping it taut and preventing it from shaking due to looseness, further improving the stability of the battery electrode sheet during transportation. After the battery electrode sheet is coated in the coating box 2, it is output through the outlet of the coating box 2 and passes through two electric heating plates 702. Then, the electric heating plates 702 are activated by the power switch on the first bracket 701, thereby heating and drying the upper and lower surfaces of the battery electrode sheet. Furthermore, after the battery electrode passes through the two electric heating plates 702, the two side edges of the battery electrode will also pass between the pressure cylinder 803 and the roller 802. Then, by rotating the screw 804, the pressure cylinder 803 can be moved downward through the adjusting block 805, so that the pressure cylinder 803 and the roller 802 abut against the upper and lower surface edges of the battery electrode. When the battery electrode is conveyed through the pressure cylinder 803 and the roller 802, the friction will cause the pressure cylinder 803 and the roller 802 to rotate, thereby squeezing the two side edges of the battery electrode to prevent the edge from bulging after the battery electrode is heated, thus avoiding breakage during subsequent conveying and winding.

[0041] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, the present utility model is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present utility model, and all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present utility model.

Claims

1. An extrusion coating apparatus for lithium battery production, comprising a base (1), a coating box (2) disposed on top of the base (1), and a feeding mechanism (3), wherein the coating box (2) has an inlet on one side and an outlet on the other side, and a coating mechanism is provided inside the coating box (2), characterized in that, Also includes: The limiting mechanism (4) includes a box body (101) located on the top of the base (1) on one side of the input end of the coating box (2), a lead screw (401) rotatably disposed on both sides of the box body (101), a movable seat (402) threaded on the wall of the lead screw (401) and slidably connected to the top of the base (1), and a limiting frame (403) disposed on the top of the movable seat (402). The box body (101) is provided with a driving component (5) for driving the two lead screws (401) to rotate simultaneously. Drying mechanism (7) is set on the top of the base (1) on one side of the output end of the coating box (2) for drying the coated battery electrode sheet; A pressing mechanism (8) is located on the top of the base (1) on one side of the output end of the coating box (2) and is used to press the edge of the dried battery electrode.

2. The extrusion coating apparatus for lithium battery production according to claim 1, characterized in that, The drive component (5) includes a throttle (501) rotatably disposed on the side wall of the housing (101), an active bevel gear (502) disposed on the inner end of the throttle (501) located on the housing (101), and a driven bevel gear (503) disposed on the inner end of the lead screw (401) located on the housing (101).

3. The extrusion coating apparatus for lithium battery production according to claim 1, characterized in that, The top of the limiting frame (403) is provided with a pressing component (6), which includes a support cylinder (601) disposed on the top of the limiting frame (403), a pressure column (602) slidably disposed inside the support cylinder (601) and extending downward into the limiting frame (403), a spring (604) disposed between the top of the pressure column (602) and the inner top wall of the support cylinder (601), and a pressure pad (603) disposed at the bottom of the pressure column (602).

4. The extrusion coating apparatus for lithium battery production according to claim 1, characterized in that, The drying mechanism (7) includes first supports (701) symmetrically arranged on both sides of the top of the base (1) and an electric heating plate (702) disposed between the two first supports (701).

5. The extrusion coating apparatus for lithium battery production according to claim 1, characterized in that, The pressing mechanism (8) includes a second bracket (801) symmetrically arranged on both sides of the top of the base (1), a roller (802) and a pressure cylinder (803) rotatably arranged between the two second brackets (801), and an adjustment component arranged on the second bracket (801) for controlling the displacement of the pressure cylinder (803) relative to the roller (802).

6. The extrusion coating apparatus for lithium battery production according to claim 5, characterized in that, The adjustment assembly includes a screw (804) rotatably mounted on the top of the second bracket (801) and an adjustment block (805) slidably mounted on the side wall of the second bracket (801) and threadedly connected to the screw (804). The rotation shaft of the pressure cylinder (803) passes through the second bracket (801) and is rotatably connected to the adjustment block (805).

7. The extrusion coating apparatus for lithium battery production according to claim 1, characterized in that, The feeding mechanism (3) includes a third bracket symmetrically arranged on both sides of the top edge of the base (1), a drive feeding roller (301) rotatably arranged between two third brackets located on one side of the input end of the coating box (2), and a drive receiving roller (302) rotatably arranged between two third brackets located on one side of the output end of the coating box (2).

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