Lithium battery pole piece water spraying mechanism

Abstract

The invention discloses a lithium battery pole piece water spraying mechanism which comprises a water spraying unit, a water supply unit for supplying water to the water spraying unit, and a high-pressure gas supply unit for conveying high-pressure gas to the water spraying unit, the water spraying unit comprises a spray head adjusting assembly, and a manifold valve block assembly and a spray head assembly which are arranged on the spray head adjusting assembly; the spray head adjusting assembly comprises two oppositely-arranged fixing supports, a fixing plate rotationally connected between the two fixing supports and a height adjusting sliding table arranged on the fixing plate, a plurality of spray head assemblies are arranged on the height adjusting sliding table, and rotation of the fixing plate is used for adjusting the spraying angles of the spray head assemblies. The lifting movement of the height adjusting sliding table is used for adjusting the spraying height of the multiple nozzle assemblies; the manifold valve block assembly is used for conveying water and high-pressure gas to the multiple spray head assemblies to be sprayed out in a mist spraying mode. Therefore, the device can adapt to arrangement of different film walking directions through angle adjustment, and the spraying area and the spraying thickness are controlled through height adjustment.

Description

Technical Field

[0001] The present invention relates to the technical field related to the treatment of lithium battery electrode sheets, and particularly relates to a water spraying mechanism for lithium battery electrode sheets. Background Art

[0002] In the production process of manufacturing lithium batteries from lithium battery electrode sheets, extrusion coating and rolling processes are indispensable. Extrusion coating realizes the uniform coating of active materials on the current collector (copper foil / aluminum foil) by precisely controlling the slurry delivery and coating process; rolling compacts the loose active material layer after coating under high pressure to adjust the thickness, density, and microstructure of the electrode sheet, directly affecting the energy density, cycle life, and safety of the battery.

[0003] In actual production, there are problems in extrusion coating such as uneven coating, surface defects, abnormal thickness, edge effect (thick edge), and drying defects. Uneven coating leads to uneven distribution of rolling pressure, overpressure in the ultra-thick area (porosity < 15%), and underpressure in the thin area (porosity > 35%), resulting in differences in lithium ion transmission paths. Surface defects cause stress concentration at the defect during rolling, forming microcracks (cracks visible by SEM > 10 μm), accelerating the side reaction of the electrolyte. Excessive thickness makes the rolling pressure too high, easily causing the tape to break; too thin thickness requires reducing the rolling pressure, which may lead to insufficient compaction and a decrease in battery capacity. Edge accumulation forms a pressure gradient during rolling, resulting in over-compaction at the edge, hindering electrolyte infiltration, and at the same time, the thick edge area is prone to powder shedding during slitting, causing short circuits. Drying defects cause warping and cracking of the electrode sheet, uneven stress during rolling, exacerbating crack propagation, and causing powder shedding and other situations.

[0004] In recent years, with the development of technology, the use of precision extrusion coating dies and high-efficiency ovens has greatly reduced the above-mentioned coating problems, but they still cannot be avoided. Summary of the Invention

[0005] The purpose of the present invention is to provide a water spraying mechanism for lithium battery electrode sheets, which can spray corresponding trace amounts of water mist on the surface of the electrode sheet before rolling according to different requirements, so that the surface of the electrode sheet reaches a certain humidity, making it easier to achieve uniform compaction during the rolling process of the electrode sheet, and at the same time reducing electrode sheet cracking and powder shedding.

[0006] To solve the above technical problems, the present invention provides a water spraying mechanism for a lithium battery electrode sheet, which includes a water spraying unit, a water supply unit for supplying water to the water spraying unit, and a high-pressure gas supply unit for supplying high-pressure gas to the water spraying unit; the water spraying unit includes a nozzle adjusting assembly, a manifold valve block assembly and a nozzle assembly provided on the nozzle adjusting assembly; the nozzle adjusting assembly includes two relatively arranged fixed supports, a fixing plate rotatably connected between the two fixed supports, and a height adjusting slide provided on the fixing plate, and a plurality of the nozzle assemblies are provided on the height adjusting slide. The rotation of the fixing plate is used to adjust the spraying angles of the plurality of nozzle assemblies, and the lifting movement of the height adjusting slide is used to adjust the spraying heights of the plurality of nozzle assemblies; the manifold valve block assembly is used to send water and high-pressure gas to the plurality of nozzle assemblies to be sprayed in a spray form.

[0007] In one embodiment, the water supply unit includes a feed tank and a water supply pipeline. The water outlet end of the feed tank is connected to the water inlet end of the water supply pipeline, and the water outlet end of the water supply pipeline is connected to the water inlet end of the water spraying unit.

[0008] In one embodiment, the high-pressure gas supply unit includes a high-pressure air pump and a high-pressure air pipe. The air outlet end of the high-pressure air pump is connected to the air inlet end of the high-pressure air pipe, and the air outlet end of the high-pressure air pipe is connected to the air inlet end of the water spraying unit.

[0009] In one embodiment, an angle adjusting plate and an arc-shaped guiding groove are provided on the fixed support; the angle adjusting plate is fixedly connected to the fixing plate, and the angle adjusting plate is rotatably connected to the fixed support. A locking screw is provided on the angle adjusting plate, and the locking screw is inserted into the arc-shaped guiding groove. The tightening of the locking screw is used to fix the relative positions of the angle adjusting plate and the fixed support.

[0010] In one embodiment, a limiting block is provided on the fixed support, the limiting block is placed within the rotation trajectory of the angle adjusting plate, and an adjustable angle bolt that can be screwed is provided on the limiting block. The screwing of the adjustable angle bolt is used to move towards and away from the angle adjusting plate.

[0011] In one embodiment, a nozzle lifting slide plate is provided on the height adjusting slide. The length direction of the nozzle lifting slide plate is the same as the length direction of the fixing plate. Along the length direction of the nozzle lifting slide plate, a plurality of the nozzle assemblies are provided on the nozzle lifting slide plate.

[0012] In one embodiment, a lifting guide rail is provided on the fixing plate. The lifting guide rail is fixedly connected to the nozzle lifting slide plate, and the guiding trajectory of the lifting guide rail is the same as the lifting trajectory of the height adjusting slide.

[0013] In one embodiment, the manifold valve block assembly includes a manifold valve seat fixedly connected to the fixed plate, as well as a waterway shunt pipe, a water shunt pipe, an air shunt pipe, and a shunt air pipe provided on the manifold valve seat; the water inlet end of the waterway shunt pipe is connected to the water outlet end of the water supply unit, the multiple water outlet ends of the waterway shunt pipe are connected to the water inlet ends of multiple water shunt pipes, and the water outlet ends of multiple water shunt pipes are respectively connected to the water inlet ends of multiple spray head assemblies; the air inlet end of the air shunt pipe is connected to the air outlet end of the high-pressure gas supply unit, the multiple air outlet ends of the air shunt pipe are connected to the air inlet ends of multiple shunt air pipes, and the air outlet ends of multiple shunt air pipes are respectively connected to the air inlet ends of multiple spray head assemblies.

[0014] In one embodiment, the spray head assembly is provided with a high-pressure atomization device.

[0015] The beneficial effects of the present invention are as follows:

[0016] Since the rotation of the fixed plate is used to adjust the spraying angles of multiple spray head assemblies, the present invention can adapt to different film running directions by angle adjustment. The lifting movement of the height adjustment slide is used to adjust the spraying height of multiple spray head assemblies, so that the present invention can control the spraying area and spraying thickness by height adjustment; further, the present invention also realizes the manifold shunt of water, has a high integration degree, convenient pipe layout, and also realizes the manifold shunt of high-pressure gas and the on-off of high-pressure gas, is used to control the on-off of water spraying to control the water spraying range, and realizes the high-pressure atomization of normal-pressure water, which is convenient for evenly and precisely spraying a small amount of water mist. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is a schematic structural diagram provided by an embodiment of the present invention;

[0019] Figure 2 is Figure 1 the rear view structural diagram of the water spraying unit;

[0020] Figure 3 is Figure 1 the front view structural diagram of the water spraying unit;

[0021] Figure 4 is Figure 2 the structural diagram of the spray head adjustment assembly in;

[0022] Figure 5 is Figure 2 Schematic structural diagram of the middle manifold valve block assembly and the nozzle assembly.

[0023] The reference numerals are as follows:

[0024] 10. Water spraying unit; 11. Nozzle adjusting assembly; 111. Fixed support; 112. Fixed plate; 113. Height adjusting slide; 114. Angle adjusting plate; 115. Arc-shaped guide groove; 116. Locking screw; 117. Limit block; 118. Adjustable angle bolt; 119. Nozzle lifting slide plate; 1110. Lifting guide rail; 12. Manifold valve block assembly; 121. Manifold valve seat; 122. Waterway shunt pipe; 123. Shunt water pipe; 124. Airway shunt pipe; 125. Shunt air pipe; 13. Nozzle assembly; 131. High-pressure atomization device;

[0025] 20. Water supply unit; 21. Feeding tank; 22. Water supply pipeline;

[0026] 30. High-pressure gas supply unit; 31. High-pressure air pump; 32. High-pressure air pipe. Specific implementation manner

[0027] 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.

[0028] The present invention provides a water spraying mechanism for lithium battery electrode sheets, and its embodiments are as Figures 1 to 5 shown, including a water spraying unit 10, a water supply unit 20 for supplying water to the water spraying unit 10, and a high-pressure gas supply unit 30 for delivering high-pressure gas to the water spraying unit 10; the water spraying unit 10 includes a nozzle adjusting assembly 11, and a manifold valve block assembly 12 and a nozzle assembly 13 provided on the nozzle adjusting assembly 11; the nozzle adjusting assembly 11 includes two relatively arranged fixed supports 111, a fixed plate 112 rotatably connected between the two fixed supports 111, and a height adjusting slide 113 provided on the fixed plate 112, and a plurality of nozzle assemblies 13 are provided on the height adjusting slide 113. The rotation of the fixed plate 112 is used to adjust the spraying angles of the plurality of nozzle assemblies 13, and the lifting movement of the height adjusting slide 113 is used to adjust the spraying heights of the plurality of nozzle assemblies 13; the manifold valve block assembly 12 is used to send water and high-pressure gas to the plurality of nozzle assemblies 13 and spray them in the form of mist.

[0029] During application, if it is necessary to adjust the spraying angle of the nozzle assembly 13, the fixed plate 112 can be controlled to rotate to adjust the spraying angle of the nozzle assembly 13. If it is necessary to adjust the spraying height of the nozzle assembly 13, the height adjusting slide 113 can be used for lifting to adjust the spraying height of the nozzle assembly 13, and finally the nozzle assembly 13 is used to spray water mist.

[0030] As Figure 1 shown, in this embodiment, the water supply unit 20 is provided with a feed tank 21 and a water supply pipeline 22. The water outlet end of the feed tank 21 is connected to the water inlet end of the water supply pipeline 22, and the water outlet end of the water supply pipeline 22 is connected to the water inlet end of the water spraying unit 10.

[0031] After adopting this setting method, the feed tank 21 can be used to store the liquid to be sprayed. For example, this liquid can be water, NMP solvent or other feasible liquids. In this text, water spraying is taken as an example for the time being. At this time, the water can be sent to the water spraying unit 10 through the water supply pipeline 22, so that the water spraying unit 10 can use high-pressure gas to cooperate with water to generate spray.

[0032] As Figure 1 shown, in this embodiment, the high-pressure gas supply unit 30 is provided with a high-pressure air pump 31 and a high-pressure air pipe 32. The air outlet end of the high-pressure air pump 31 is connected to the air inlet end of the high-pressure air pipe 32, and the air outlet end of the high-pressure air pipe 32 is connected to the air inlet end of the water spraying unit 10.

[0033] After adopting this setting method, the high-pressure air pump 31 can generate high-pressure gas, and the generated high-pressure gas can be transported to the water spraying unit 10 through the high-pressure air pipe 32, so that the water spraying unit 10 can use high-pressure gas to cooperate with water to generate spray.

[0034] As Figure 4 shown, in this embodiment, an angle adjustment plate 114 and an arc-shaped guide groove 115 are provided on the fixed support 111; the angle adjustment plate 114 is fixedly connected to the fixed plate 112, and the angle adjustment plate 114 is rotatably connected to the fixed support 111. A locking screw 116 is provided on the angle adjustment plate 114, and the locking screw 116 is inserted into the arc-shaped guide groove 115. Tightening the locking screw 116 is used to fix the relative position of the angle adjustment plate 114 and the fixed support 111.

[0035] After adopting this setting method, since the locking screw 116 is inserted into the arc-shaped guide groove 115, if the locking screw 116 is in a loosened state at this time, the cooperation between the locking screw 116 and the arc-shaped guide groove 115 will limit the rotation trajectory of the angle adjustment plate 114. Wait until the angle adjustment plate 114 rotates to the required position, and then tighten the locking screw 116 to lock the current position of the angle adjustment plate 114.

[0036] As Figure 4 shown, in this embodiment, a limiting block 117 is provided on the fixed support 111. The limiting block 117 is placed within the rotation trajectory of the angle adjustment plate 114, and an adjustable angle bolt 118 that can be screwed is provided on the limiting block 117. Screwing the adjustable angle bolt 118 is used to move towards and away from the angle adjustment plate 114.

[0037] After adopting this setting method, by turning the position of the adjustable angle bolt 118, after the position of the adjustable angle bolt 118 is determined, the swing amplitude of the angle adjustment plate 114 towards the adjustable angle bolt 118 will be locked. Therefore, through the turning operation of the adjustable angle bolt 118, the position positioning of the angle adjustment plate 114 can be actually achieved, so that after the angle adjustment plate 114 is adjusted in place, the position can be locked again.

[0038] As Figure 3 and Figure 4 shown, in this embodiment, a nozzle lifting slide plate 119 is provided on the height adjustment slide 113. The length direction of the nozzle lifting slide plate 119 is the same as the length direction of the fixing plate 112. Along the length direction of the nozzle lifting slide plate 119, a plurality of nozzle assemblies 13 are provided on the nozzle lifting slide plate 119.

[0039] After adopting this setting method, the height adjustment slide 113 can be used to drive the nozzle lifting slide plate 119 to perform lifting movement. Since a plurality of nozzle assemblies 13 are provided on the nozzle lifting slide plate 119, the lifting movement control of the plurality of nozzle assemblies 13 is realized.

[0040] As Figure 4 shown, in this embodiment, a lifting guide rail 1110 is provided on the fixing plate 112. The lifting guide rail 1110 is fixedly connected to the nozzle lifting slide plate 119, and the guiding track of the lifting guide rail 1110 is the same as the lifting track of the height adjustment slide 113.

[0041] After adopting this setting method, once the height adjustment slide 113 performs a lifting operation, the lifting guide rail 1110 will limit the lifting track simultaneously with the height adjustment slide 113, thereby ensuring the accurate control of the lifting direction and the stability of the lifting process.

[0042] As Figures 2 to 5 shown, in this embodiment, the manifold valve block assembly 12 includes a manifold valve seat 121 fixedly connected to the fixing plate 112, and a water flow shunt pipe 122, a shunt water pipe 123, a gas flow shunt pipe 124 and a shunt gas pipe 125 provided on the manifold valve seat 121; the water inlet end of the water flow shunt pipe 122 is connected to the water outlet end of the water supply unit 20, and the multiple water outlet ends of the water flow shunt pipe 122 are connected to the water inlet ends of multiple shunt water pipes 123, and the water outlet ends of the multiple shunt water pipes 123 are respectively connected to the water inlet ends of multiple nozzle assemblies 13; the gas inlet end of the gas flow shunt pipe 124 is connected to the gas outlet end of the high-pressure gas supply unit 30, and the multiple gas outlet ends of the gas flow shunt pipe 124 are connected to the gas inlet ends of multiple shunt gas pipes 125, and the gas outlet ends of the multiple shunt gas pipes 125 are respectively connected to the gas inlet ends of multiple nozzle assemblies 13.

[0043] After adopting this setting method, the water supply unit 20 will transport water to the water flow shunt pipe 122. The water flow shunt pipe 122 will divide the water into multiple paths and send it to multiple branch water pipes 123. The multiple branch water pipes 123 will then send the water to multiple nozzle assemblies 13 respectively. The high-pressure gas supply unit 30 will send high-pressure gas to the gas flow shunt pipe 124. The gas flow shunt pipe 124 will divide the high-pressure gas into multiple paths and send it to multiple branch gas pipes 125. The multiple branch gas pipes 125 will then send the high-pressure gas to multiple nozzle assemblies 13 respectively, so that the nozzle assemblies 13 can convert the received water and high-pressure gas into spray and eject it.

[0044] As Figure 5 shown, in this embodiment, the nozzle assembly 13 is provided with a high-pressure atomization device 131.

[0045] After adopting this setting method, the nozzle assembly 13 can use the high-pressure atomization device 131 to convert the received water and high-pressure gas into spray to ensure that it can be evenly sprayed on the lithium battery electrode plate.

[0046] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A lithium battery pole piece water spraying mechanism, characterized in that: It comprises a water spray unit, a water supply unit for supplying water to the water spray unit, and a high-pressure gas supply unit for delivering high-pressure gas to the water spray unit; The water spray unit includes a spray head adjustment assembly, and a manifold valve block assembly and a spray head assembly arranged on the spray head adjustment assembly; The nozzle adjustment assembly includes two fixed supports arranged opposite to each other, a fixed plate rotatably connected between the two fixed supports, and a height adjustment slide arranged on the fixed plate, a plurality of nozzle assemblies are arranged on the height adjustment slide, the rotation of the fixed plate is used to adjust the spraying angles of the plurality of nozzle assemblies, and the lifting and lowering movement of the height adjustment slide is used to adjust the spraying heights of the plurality of nozzle assemblies; The manifold valve block assembly is used to deliver water and high-pressure gas to the plurality of spray head assemblies to spray out in the form of spray.

2. The lithium battery pole piece water spraying mechanism according to claim 1, characterized in that: The water supply unit comprises a feed tank and a water supply pipeline, the water outlet end of the feed tank is connected to the water inlet end of the water supply pipeline, and the water outlet end of the water supply pipeline is connected to the water inlet end of the water spray unit.

3. The lithium battery pole piece water spraying mechanism according to claim 1, characterized in that: The high-pressure gas supply unit includes a high-pressure air pump and a high-pressure air pipe, the air outlet end of the high-pressure air pump is connected to the air inlet end of the high-pressure air pipe, and the air outlet end of the high-pressure air pipe is connected to the air inlet end of the water spray unit.

4. The lithium battery pole piece water spraying mechanism according to claim 1, characterized in that: The fixed support is provided with an angle adjustment plate and an arc-shaped guide groove; The angle adjustment plate is connected and fixed to the fixed plate, and the angle adjustment plate and the fixed support are rotatably connected. A locking screw is provided on the angle adjustment plate, and the locking screw is inserted into the arc guide groove. Tightening the locking screw is used to fix the relative position of the angle adjustment plate and the fixed support.

5. The lithium battery pole piece water spraying mechanism according to claim 4, characterized in that: The fixed support is provided with a limit block, the limit block is placed in the rotation track of the angle adjustment plate, and the limit block is provided with a screwable adjustable angle bolt, and the screwing of the adjustable angle bolt is used to move toward and away from the angle adjustment plate.

6. The lithium battery pole piece water spraying mechanism according to claim 1, characterized in that: A nozzle lifting slide is provided on the height adjustment slide, the length direction of the nozzle lifting slide is consistent with the length direction of the fixed plate, and a plurality of nozzle assemblies are provided on the nozzle lifting slide along the length direction of the nozzle lifting slide.

7. The lithium battery pole piece water spraying mechanism according to claim 6, characterized in that: The fixed plate is provided with a lifting guide rail, the lifting guide rail is connected and fixed to the nozzle lifting slide plate, and the guide track of the lifting guide rail is consistent with the lifting track of the height adjustment slide.

8. The lithium battery pole piece water spraying mechanism according to claim 1, characterized in that: The manifold valve block assembly includes a manifold valve seat connected and fixed to the fixing plate, and a waterway shunt pipe, a shunt water pipe, a gasway shunt pipe and a shunt gas pipe arranged on the manifold valve seat; The water inlet end of the waterway diversion pipe is connected to the water outlet end of the water supply unit, the multiple water outlet ends of the waterway diversion pipe are connected to the water inlet ends of the multiple diversion water pipes, and the water outlet ends of the multiple diversion water pipes are respectively connected to the water inlet ends of the multiple nozzle assemblies; The air inlet end of the gas path diverter pipe is connected to the air outlet end of the high-pressure gas supply unit, the multiple air outlet ends of the gas path diverter pipe are connected to the air inlet ends of multiple diverter air pipes, and the air outlet ends of multiple diverter air pipes are respectively connected to the air inlet ends of multiple nozzle assemblies.

9. The lithium battery pole piece water spraying mechanism according to claim 8, characterized in that: The nozzle assembly is provided with a high-pressure atomizing device.

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