CN216965141U - Extrusion die head for coating lithium battery pole piece - Google Patents
Extrusion die head for coating lithium battery pole piece Download PDFInfo
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- CN216965141U CN216965141U CN202121343238.6U CN202121343238U CN216965141U CN 216965141 U CN216965141 U CN 216965141U CN 202121343238 U CN202121343238 U CN 202121343238U CN 216965141 U CN216965141 U CN 216965141U
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Abstract
The utility model relates to an extrusion die head for coating a lithium battery pole piece, which comprises an upper die head (5), an extrusion gasket (6) and a lower die head (7); the extrusion gasket (6) is clamped between the upper die head (5) and the lower die head (7); the extrusion die head further comprises: a ceramic slurry inlet (4) for injecting ceramic slurry into the extrusion gasket (6); an electrode slurry inlet (9) for injecting electrode slurry into the extrusion gasket (6); one side edge of the upper die head (5) and one side edge of the lower die head (7) form a die head lip (1) for extruding slurry. Compared with the prior art, the utility model can improve the battery performance problem caused by unstable coating weight and material mixing, reduce the scrapping cost, improve the utilization rate of raw materials and reduce the equipment adjusting rate.
Description
Technical Field
The utility model relates to the field of new energy materials, in particular to an extrusion die head for coating a lithium battery pole piece.
Background
With the rapid development of the lithium battery industry, the requirements on energy density and safety of the lithium battery are higher and higher in the aspect of automobile power batteries, and the coating process plays a crucial role in the performance of the battery.
Transfer coating and extrusion coating are adopted in the industry at present, and in terms of extrusion coating, the extrusion coating has the advantages of excellent coating surface density consistency, wide application range of slurry viscosity, capability of coating ceramic coating at the same time of coating, capability of coating 1 to 2, 1 to 4, 1 to 6 and the like according to requirements, good extrusion coating compatibility and the like, so that the extrusion coating becomes the mainstream of the lithium battery coating. The extrusion die is critical throughout the coating apparatus and typically includes an upper die, a lower die, and an extrusion shim, among others.
The existing extrusion coating process has the following problems: in terms of the quality of the pole piece, the problems of material mixing, unstable coating weight and the like exist, and the coating yield and the pole piece scrap are reduced invisibly; in terms of battery performance, uneven weight affects rolling, causes a problem of compaction density, and finally affects battery capacity and the like; overall, coating weight is difficult to adjust, equipment adjusting rate is high, use efficiency is reduced, and "U-shaped" or concave "weight often appears in the coating process.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome at least one of the defects in the prior art and provide the extrusion die head for coating the lithium battery pole piece, which can improve the battery performance problem caused by unstable coating weight and material mixing, reduce the scrap cost, improve the utilization rate of raw materials and reduce the equipment regulation rate.
The purpose of the utility model can be realized by the following technical scheme:
an extrusion die head for coating a lithium battery pole piece comprises an upper die head, an extrusion gasket and a lower die head;
the extrusion gasket is clamped between the upper die head and the lower die head;
the extrusion die further comprises:
a ceramic slurry inlet for injecting ceramic slurry into the extrusion shim;
an electrode paste inlet for injecting electrode paste into the extrusion gasket;
one side edge of the upper die head and the lower die head forms a die head lip for extruding the slurry.
Further, the extrusion gasket includes:
the ceramic slurry conveying mechanism is used for receiving and conveying ceramic slurry;
a tab blank area for reserving a required tab position for the pole piece;
the electrode slurry discharging area is used for coating the electrode slurry on the base material;
the electrode slurry discharging areas are positioned on two sides of the outside of the tab blank area, and the ceramic slurry conveying mechanisms are positioned on two sides of the tab blank area;
the ceramic slurry conveying mechanism is connected with the ceramic slurry inlet, and the electrode slurry discharging area is connected with the electrode slurry inlet.
Further, the ceramic slurry conveying mechanisms are positioned on the two outer sides and/or the two inner sides of the tab whitening area.
Further, ceramic thick liquids transport mechanism include in proper order:
the ceramic slurry feeding port is used for providing ceramic slurry for the extrusion gasket;
the ceramic slurry flow channel is used for providing a circulation path for the ceramic slurry;
the ceramic slurry discharge port is used for coating the ceramic slurry on the base material, and the design of the ceramic slurry discharge port can design a chamfer according to the process requirement, so that the problems of fusion, thinning and the like are mainly solved;
furthermore, a pressure reduction groove is dug in the ceramic slurry flow channel, so that the defects caused by overlarge flow and flow speed of the ceramic slurry are prevented;
one side of the ceramic slurry discharge port is also provided with an adjustable flow-resisting ear for reducing the edge flow and preventing the poor effect caused by the over-thick edge thickness of the ceramic slurry coating area.
Further, the electrode slurry discharging area comprises:
an electrode slurry discharge port;
and the detachable slurry spoiler is used for controlling the discharge flow of the electrode slurry. Due to the cavity pressure, the coating is in a U shape or a concave shape due to high flow, high flow velocity and the like easily generated during coating, and the slurry flow blocking sheet has the function of solving the problem and can be used as a movable detachable type according to requirements;
the electrode paste discharge port reserves the electrode paste coating width according to the designed size, the electrode paste discharge port is generally smaller than the actual pole piece design coating width by 0.5-1.5mm, the main reason is that the size is influenced by the gap between the extrusion die head and the steel roller, and chamfer processing is generally carried out to solve the thinning problem, chamfers of 3 multiplied by 5mm, 2.5 multiplied by 5mm, 3 multiplied by 4mm and 2 multiplied by 4mm are suggested to be used, but the chamfer size is not limited to the above chamfer size.
Further, the extrusion gasket includes:
the mixing prevention block is used for preventing the ceramic slurry and the electrode slurry from mixing; the electrode slurry and the ceramic slurry are mixed to prevent the problems of capacity, performance, safety and the like, can be generally used as an auxiliary material, can reduce the pressure on two sides of a cavity, and can cause the slurry to flow into other positions from a gap through extrusion;
the installation device comprises a plurality of installation positioning holes and adjusting lugs for clamping, and has the main functions of convenience in installation of the extrusion gaskets, can be used as a reference in installation, and can be used for adjusting dislocation after the upper die head and the lower die head are assembled in a cavity after installation;
the anti-mixing block is positioned at the corner of the electrode slurry discharging area, and the adjusting lugs are positioned at two sides of the extrusion gasket.
Further, the extrusion gasket comprises an overflow mechanism for discharging the excessive slurry during coating;
the overflow mechanism comprises an overflow flow channel, a discharge flow channel and a discharge flow channel, wherein the overflow flow channel is used for relieving slurry leakage, particularly relieving slurry leakage caused by pressure or other reasons, preventing material mixing and providing a discharge path for redundant slurry;
and the overflow receiving disc is used for receiving the overflowing slurry.
Furthermore, a plurality of weight adjusting assemblies are arranged on the upper die head and used for controlling the coating pressure between the upper die head and the lower die head.
Further, the extrusion die head also comprises
A die head base plate;
the die head dismounting assembly is used for dismounting the extrusion die head;
the die head bottom plate is positioned at the bottom of the lower die head.
Compared with the prior art, the utility model has the following advantages:
(1) the ceramic slurry conveying mechanism is provided with the pressure reduction groove, so that the defects caused by overlarge ceramic slurry flow and flow speed can be prevented; and the flow-resisting ears can also reduce the edge flow, prevent the defects caused by the excessively thick edge of the ceramic slurry coating area, and contribute to the final coating quality;
(2) for electrode slurry, the utility model is also provided with a slurry flow blocking sheet, a mixing material block prevention blocking block and other mechanisms, and is also used for synchronously controlling the final coating quality;
(3) in order to better control the coating pressure, the utility model is specially provided with a plurality of weight adjusting components, and like high-pressure valves on a pressure cooker, the pressure conditions at each position can be adjusted through the quantity and the position, so that the problem of local insufficient pressure or excessive pressure is avoided;
(4) the utility model can improve the battery performance problem caused by unstable coating weight and material mixing, reduce the scrap cost, improve the utilization rate of raw materials and reduce the equipment adjusting rate.
Drawings
FIG. 1 is a general structural view of an extrusion die in the examples;
FIG. 2 is a side view of an extrusion die in an embodiment;
FIG. 3 is a view showing the structure of a pressing pad in the embodiment;
FIG. 4 is a schematic view of a coating operation in the example;
FIG. 5 is a diagram showing the coating effect in the examples;
the reference numbers in the figures indicate: die head lip 1, weight adjusting component 2, die head dismounting component 3, ceramic slurry inlet 4, upper die head 5, extrusion gasket 6, ceramic slurry conveying mechanism 61, ceramic slurry feeding port 611, ceramic slurry flow channel 612, decompression groove 613, flow-blocking ear 614, ceramic slurry discharging port 615, tab whitening area 62, electrode slurry discharging area 63, electrode slurry discharging port 631, slurry flow-blocking piece 632, material mixing prevention block 64, overflow flow channel 651, overflow receiving disc 652, mounting positioning hole 66, adjusting ear 67, lower die head 7, die head bottom plate 8 and electrode slurry inlet 9.
Detailed Description
The utility model is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
Examples
An extrusion die head for coating a lithium battery pole piece is shown in figures 1-2, and comprises an upper die head 5, an extrusion gasket 6 and a lower die head 7; the extrusion gasket 6 is clamped between the upper die head 5 and the lower die head 7; the extrusion die further comprises: a ceramic slurry inlet 4 for injecting ceramic slurry into the extrusion gasket 6; an electrode paste inlet 9 for injecting an electrode paste into the pressing pad 6; one side edges of the upper die 5 and the lower die 7 form a die lip 1 for extruding the slurry.
The upper die 5 is also arranged with a plurality of weight adjusting assemblies 2 for controlling the coating pressure between the upper die 5 and the lower die 7. The extrusion die further comprises: a die head base plate 8; the die head dismounting assembly 3 is used for dismounting the extrusion die head; the die bottom plate 8 is located at the bottom of the lower die 7.
As shown in fig. 3, the pressing pad 6 includes: a ceramic slurry transport mechanism 61 for receiving and transporting ceramic slurry; a tab blank area 62 for reserving a required tab position for the pole piece; an electrode slurry discharge zone 63 for coating the electrode slurry on the base material; the electrode slurry discharging areas 63 are positioned on two outer sides of the tab whitening area 62, and the ceramic slurry conveying mechanisms 61 are positioned on two sides of the tab whitening area 62;
the pressing pad 6 further includes: a mixing prevention block 64 for preventing mixing of the ceramic slurry and the electrode slurry; the electrode slurry and the ceramic slurry are mixed to prevent the problems of capacity, performance, safety and the like, can be generally used as an auxiliary material, can reduce the pressure on two sides of a cavity, and can cause the slurry to flow into other positions from a gap through extrusion; the installation positioning holes 66 and the adjustment lugs 67 are used for clamping, the main functions of the installation positioning holes are that the installation of the extrusion gasket 6 is convenient, the installation positioning holes can be used as references in installation, and the dislocation adjustment is caused after the upper die head and the lower die head are closed after installation; the mixing prevention plugs 64 are positioned at the corners of the electrode paste discharge area 63, and the adjustment ears 67 are positioned at the two sides of the extrusion pad 6.
The extrusion gasket 6 further comprises an overflow mechanism for discharging excess slurry during coating; the overflow mechanism comprises an overflow flow channel 651, which is used for relieving slurry leakage, particularly slurry leakage caused by pressure or other reasons, preventing material mixing and providing a discharge path for redundant slurry; and an overflow receiving pan 652 for receiving the overflow slurry.
The ceramic slurry transport mechanism 61 is connected to the ceramic slurry inlet 4, and the electrode slurry discharge zone 63 is connected to the electrode slurry inlet 9. The ceramic slurry transport mechanisms 61 are located on both outer and inner sides of the tab whitening zone 62.
Ceramic slurry transport mechanism 61 includes in proper order: a ceramic slurry feed port 611 for supplying ceramic slurry to the extrusion pad 6; a ceramic slurry flow passage 612 providing a flow path for the ceramic slurry; a ceramic slurry discharge port 615, wherein the ceramic slurry is coated on the substrate, and chamfers can be designed according to the process requirements by the design of the ceramic slurry discharge port 615, so that the problems of fusion, thinning and the like are mainly solved; a pressure reducing groove 613 is also dug in the ceramic slurry flow passage 612 to prevent the defects caused by overlarge ceramic slurry flow and flow speed; an adjustable flow-resisting ear 614 is further arranged on one side of the ceramic slurry discharge port 615 and is used for reducing edge flow and preventing defects caused by too thick edge of a ceramic slurry coating area.
The electrode slurry discharge section 63 includes: an electrode paste discharge port 631; and the detachable slurry spoiler 632 is used for controlling the discharge flow of the electrode slurry. Because of the cavity pressure, the coating is in a U shape or a concave shape due to the large flow, the large flow velocity and the like easily generated during coating, and the slurry choke piece 632 is used for solving the problem and can be detached movably and used according to requirements.
In this embodiment, taking 1 out of 4 as an example, as shown in fig. 4-5, the pole pieces are 1 out of 4 pole pieces, and 4 individual pole pieces are finally formed after coating, rolling and slitting.
The extrusion die head is the core of the whole extrusion coating machine, the extrusion gasket 6 meeting the process requirements is arranged in the die head, after the extrusion gasket is fixed, the slurry is injected into a die head cavity through a slurry system, and finally the slurry is coated on the foil through the die head.
And the extrusion gasket 6 firstly ensures the precision of the gasket, the part is a linear cutting part, the thickness uniformity is less than or equal to 0.006mm, the surface roughness is 0.8, and the non-dimensional position and the mounting hole position are subjected to fillet treatment. The thickness of the extruded gasket 6 is generally selected according to the coating process requirements, and in this embodiment, a gasket having a thickness of 0.6-1.4mm is used.
The blank regions shown in fig. 5 are the blank thin tab regions, the shaded regions are the electrode paste coating regions, and the filled regions are the ceramic coatings.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the utility model may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (10)
1. An extrusion die head for coating a lithium battery pole piece is characterized by comprising an upper die head (5), an extrusion gasket (6) and a lower die head (7);
the extrusion gasket (6) is clamped between the upper die head (5) and the lower die head (7);
the extrusion die further comprises:
a ceramic slurry inlet (4) for injecting ceramic slurry into the extrusion gasket (6);
an electrode slurry inlet (9) for injecting electrode slurry into the extrusion gasket (6);
one side edge of the upper die head (5) and one side edge of the lower die head (7) form a die head lip (1) for extruding slurry.
2. The extrusion die head for coating the lithium battery pole piece as recited in claim 1, wherein the extrusion shim (6) comprises:
a ceramic slurry transport mechanism (61) for receiving and transporting a ceramic slurry;
a tab blank area (62) for reserving a required tab position for the pole piece;
an electrode paste discharge area (63) for coating the electrode paste on the substrate;
the electrode slurry discharging areas (63) are positioned on two outer sides of the tab whitening area (62), and the ceramic slurry conveying mechanisms (61) are positioned on two sides of the tab whitening area (62);
the ceramic slurry conveying mechanism (61) is connected with the ceramic slurry inlet (4), and the electrode slurry discharging area (63) is connected with the electrode slurry inlet (9).
3. The extrusion die for coating the lithium battery pole piece as claimed in claim 2, wherein the ceramic slurry transportation mechanism (61) is located at the outer side and/or the inner side of the tab whitening area (62).
4. The extrusion die head for coating the lithium battery pole piece as claimed in claim 2, wherein the ceramic slurry conveying mechanism (61) comprises in sequence:
a ceramic slurry feed port (611) for providing ceramic slurry to the extrusion pad (6);
a ceramic slurry flow channel (612) that provides a flow path for the ceramic slurry;
a ceramic slurry outlet (615) for applying the ceramic slurry to a substrate.
5. The extrusion die head for coating the lithium battery pole piece, as recited in claim 4, characterized in that a pressure relief groove (613) is further dug on the ceramic slurry flow channel (612);
one side of the ceramic slurry discharge port (615) is also provided with an adjustable flow-resisting ear (614).
6. The extrusion die for coating a lithium battery pole piece according to claim 2, wherein the electrode slurry discharging area (63) comprises:
an electrode slurry discharge port (631);
and the detachable slurry spoiler (632) is used for controlling the discharge flow of the electrode slurry.
7. The extrusion die head for coating the lithium battery pole piece as claimed in claim 2, wherein the extrusion shim (6) comprises:
a mixing prevention block (64) for preventing mixing of the ceramic slurry and the electrode slurry;
a plurality of mounting positioning holes (66) and adjusting ears (67) for clamping;
the anti-mixing block (64) is positioned at the corner of the electrode slurry discharging area (63), and the adjusting ears (67) are positioned at two sides of the extrusion gasket (6).
8. The extrusion die head for coating the lithium battery pole piece as claimed in claim 1, wherein the extrusion gasket (6) comprises an overflow mechanism for discharging excess slurry during coating;
the overflow mechanism comprises an overflow runner (651) for mitigating slurry leakage;
and an overflow receiving tray (652) for receiving the overflow slurry.
9. The extrusion die for coating the lithium battery pole piece as claimed in claim 1, wherein a plurality of weight adjusting assemblies (2) are further arranged on the upper die head (5) for controlling the coating pressure between the upper die head (5) and the lower die head (7).
10. The extrusion die head for coating the lithium battery pole piece as claimed in claim 1, wherein the extrusion die head further comprises
A die head floor (8);
the die head dismounting assembly (3) is used for dismounting the extrusion die head;
the die head bottom plate (8) is positioned at the bottom of the lower die head (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121343238.6U CN216965141U (en) | 2021-06-17 | 2021-06-17 | Extrusion die head for coating lithium battery pole piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121343238.6U CN216965141U (en) | 2021-06-17 | 2021-06-17 | Extrusion die head for coating lithium battery pole piece |
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| Publication Number | Publication Date |
|---|---|
| CN216965141U true CN216965141U (en) | 2022-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121343238.6U Active CN216965141U (en) | 2021-06-17 | 2021-06-17 | Extrusion die head for coating lithium battery pole piece |
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| Country | Link |
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| CN (1) | CN216965141U (en) |
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2021
- 2021-06-17 CN CN202121343238.6U patent/CN216965141U/en active Active
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