CN216137543U - Extrusion type coating die for coating lithium ion battery pole piece - Google Patents
Extrusion type coating die for coating lithium ion battery pole piece Download PDFInfo
- Publication number
- CN216137543U CN216137543U CN202121511163.8U CN202121511163U CN216137543U CN 216137543 U CN216137543 U CN 216137543U CN 202121511163 U CN202121511163 U CN 202121511163U CN 216137543 U CN216137543 U CN 216137543U
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- slurry
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- gap
- die body
- coating
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- 238000000576 coating method Methods 0.000 title claims abstract description 22
- 239000011248 coating agent Substances 0.000 title claims abstract description 20
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 12
- 238000001125 extrusion Methods 0.000 title abstract description 6
- 239000002002 slurry Substances 0.000 claims abstract description 100
- 238000007765 extrusion coating Methods 0.000 claims abstract description 8
- 230000007423 decrease Effects 0.000 claims description 3
- 238000007607 die coating method Methods 0.000 description 9
- 238000009826 distribution Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 230000003139 buffering effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009828 non-uniform distribution Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0254—Coating heads with slot-shaped outlet
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Coating Apparatus (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The disclosure relates to an extrusion type coating die for coating a lithium ion battery pole piece. The extrusion coating die comprises an upper die body and a lower die body. The upper die body comprises a slurry outlet. The lower mold body includes a slurry chamber and two or more buffer tanks. The lower die body is provided with a slurry inlet at the rear side. When the upper die body and the lower die body are assembled, a gap in the width direction of the extrusion coating die exists between the upper die body and the lower die body on the front side opposite to the slurry inlet. The slurry chamber is located between the slurry inlet and the two or more surge tanks, and the two or more surge tanks are located between the slurry chamber and the gap in a direction from the slurry inlet to the gap.
Description
Technical Field
The present disclosure relates generally to the manufacture of lithium ion battery pole pieces, and more particularly to a die coating die for coating lithium ion battery pole pieces.
Background
Rechargeable lithium ion batteries have been used as power sources for a variety of stationary and portable applications. Their structure and electrochemical reaction mechanism provide them with several desirable characteristics, including relatively high energy density, relatively low internal resistance, generally no memory effect when compared to other types of rechargeable batteries (e.g., nickel-cadmium batteries), and low self-discharge rates. These characteristics make lithium ion batteries the preferred mobile power source for portable consumer electronics products, such as laptop computers and cell phones.
The coating of the pole piece is an important process for the production of the lithium ion battery. In recent years, the coating process technology has also been developed from a conventional transfer coating method with a relatively low speed to a high-speed extrusion coating method.
In the die coating method, a die is used to coat the slurry on the electrode sheet. The existing extrusion type coating die has defects in coating uniformity.
SUMMERY OF THE UTILITY MODEL
The present disclosure provides an extrusion coating die for coating a lithium ion battery pole piece. The extrusion coating die comprises an upper die body and a lower die body. The upper die body comprises a slurry outlet. The lower mold body includes a slurry chamber and two or more buffer tanks. The lower die body is provided with a slurry inlet at the rear side. When the upper die body and the lower die body are assembled, a gap in the width direction of the extrusion coating die exists between the upper die body and the lower die body on the front side opposite to the slurry inlet. The slurry chamber is located between the slurry inlet and the two or more surge tanks, and the two or more surge tanks are located between the slurry chamber and the gap in a direction from the slurry inlet to the gap.
In one embodiment, the lower die body has two or more slurry inlets on the rear side.
In one embodiment, the two or more slurry inlets are uniformly arranged in the width direction of the die.
In one embodiment, the two or more slurry inlets are non-uniformly arranged in the width direction of the die.
In one embodiment, the two or more buffer slots have a depth that gradually decreases in a direction from the slurry inlet to the gap.
In one embodiment, the bottom surfaces of the two or more buffer slots are substantially semicircular.
In one embodiment, the shape of the bottom surface of the two or more buffer grooves is a portion of an ellipse.
In one embodiment, the radius of the bottom surface of the two or more buffer grooves decreases gradually in the direction from the slurry inlet to the gap.
According to this disclosed extrusion formula coating die for coating lithium ion battery pole piece includes two or more dashpot for thick liquids in the mould can follow mould width direction more even distribution before being extruded, thereby makes the thick liquids that extrude from the mould more even along mould width direction, has improved coating thickness's uniformity. The extrusion coating die for coating the lithium ion battery pole piece according to the present disclosure may include two or more feed ports, thereby making the supply of the slurry more uniform in the die width direction.
Drawings
Fig. 1 schematically shows an exploded perspective view of a die for die coating of the prior art;
fig. 2 schematically shows an assembled perspective view of the die for die coating of the prior art shown in fig. 1;
fig. 3 schematically shows an assembled rear view of the die for die coating of the prior art shown in fig. 1;
fig. 4 schematically illustrates an exploded perspective view of a die for die coating according to one embodiment of the present disclosure;
fig. 5 schematically illustrates an assembled perspective view of the die of fig. 4 according to one embodiment of the present disclosure; and is
Fig. 6 schematically illustrates an assembled rear view of the die coating die shown in fig. 4 according to one embodiment of the present disclosure.
Detailed Description
Fig. 1 to 3 schematically show a related art die 100, in which fig. 1 schematically shows an exploded perspective view of the related art die 100, fig. 2 schematically shows an assembled perspective view of the related art die 100 shown in fig. 1, and fig. 3 schematically shows an assembled rear view of the related art die 100 shown in fig. 1.
As shown in fig. 1, a related art die 100 for die coating includes an upper die body 110 and a lower die body 120. The lower mold body 120 includes a slurry chamber 130 and a buffer tank 140. The lower mold body 120 has a slurry inlet 150 at a rear side. The upper die body 110 has a slurry outlet 160 at the top side.
As shown in fig. 2, when the upper and lower mold bodies 110 and 120 are assembled, a gap 170 in the width direction of the mold 100 exists between the upper and lower mold bodies 110 and 120 at a front side opposite to the slurry inlet 150.
In the direction from the slurry inlet 150 to the gap 170, the slurry chamber 130 is located between the slurry inlet 150 and the buffer tank 140, and the buffer tank 140 is located between the slurry chamber 130 and the gap 170.
In operation, slurry is delivered from the slurry inlet 150 into the mold 100 and fills the slurry cavity 130. Next, the slurry flows through the interval between the slurry chamber 130 and the buffer tank 140 and fills the buffer tank 140. Finally, the slurry in the buffer tank 140 is extruded at the gap 170 between the upper and lower molds 110 and 120.
In the die 100 of the prior art, as shown in fig. 1 and 3, the lower die body 120 includes only one slurry inlet 150. Slurry can only be delivered to the mold 100 from this one slurry inlet 150. Due to the fluidity of the slurry, the slurry may flow into the buffer tank before filling both sides of the slurry chamber 130, resulting in an uneven distribution of the slurry in the slurry chamber 130.
In the die 100 of the related art, as shown in fig. 1, the lower die body 120 includes only one buffer groove 140. During the flow of the slurry from the slurry inlet 150 to the gap 170, since only one buffer tank 140 is provided, the buffer stroke and the buffering effect provided are not ideal enough, thereby causing the uneven distribution of the slurry in the buffer tank 140. Since the slurry is not uniformly distributed in the buffer tank 140, the slurry extruded from the gap 170 is not uniform in the width direction of the die, and a non-uniform distribution having a thick middle and thin both sides is formed, and finally, the uniformity of the coating thickness is not good.
In order to overcome the above-mentioned not enough of prior art, this disclosure provides an improved extrusion formula coating die, and it can make thick liquids distribute along mould width direction more evenly after getting into mould inside to make the thick liquids that extrude from the mould more even along mould width direction, improved coating thickness's uniformity.
Fig. 4 to 6 schematically show a die 200 according to an embodiment of the present disclosure, in which fig. 4 schematically shows an exploded perspective view of the die 200, fig. 5 schematically shows an assembled perspective view of the die 200 shown in fig. 4, and fig. 6 schematically shows an assembled rear view of the die 200 shown in fig. 4.
As shown in fig. 4, the die 200 includes an upper die body 210 and a lower die body 220. The lower mold body 220 includes a slurry chamber 230 and two buffer tanks 240a, 240 b. The lower mold body 220 has a slurry inlet 250 at a rear side. The upper die body 210 includes a slurry outlet 260. As shown in fig. 4, the slurry outlet 260 is located at a top side of the upper mold body 210. In some embodiments, the slurry outlet 260 may also be located elsewhere on the upper mold body 210.
In some embodiments, lower mold body 220 has two or more slurry inlets 250 on the rear side. Fig. 4 shows three slurry inlets 250. In other embodiments of the present disclosure, the lower mold body 220 may include two or more than three slurry inlets. In some embodiments, two or more slurry inlets 250 are uniformly disposed along the width of the mold 200. In some embodiments, two or more slurry inlets 250 are non-uniformly disposed along the width of the mold 200.
As shown in fig. 5, when the upper and lower mold bodies 210 and 220 are assembled, a gap 270 exists between the upper and lower mold bodies 210 and 220 in the width direction of the mold 200 at the front side opposite to the slurry inlet 250.
In the direction from the slurry inlet 250 to the gap 270, the slurry chamber 230 is located between the slurry inlet 250 and the surge tank 240a, the surge tank 240a is located between the slurry chamber 230 and the surge tank 240b, and the surge tank 240b is located between the surge tank 240a and the gap 270. In other words, the slurry flowing in from the slurry inlet 250 is extruded from the gap 270 after passing through the slurry chamber 230, the buffer groove 240a, and the buffer groove 240b in order.
In some embodiments, the lower mold body 220 may include more than two buffer slots disposed between the slurry inlet 250 and the gap 270 in a direction from the slurry inlet 250 to the gap 270.
As shown in fig. 4, the bottom surfaces of the buffer grooves 240a and 240b are substantially semicircular, and the radius of the bottom surface of the buffer groove 240b is smaller than that of the bottom surface of the buffer groove 240 a.
In the die for die coating according to the present disclosure, the depths (e.g., the radii of the substantially semicircular bottom surfaces) of the two or more buffer grooves are gradually reduced in the direction from the slurry inlet 250 to the gap 270.
In some embodiments, the bottom surfaces of two or more buffer slots may be other shapes, such as a portion of an ellipse, or the like.
In operation, slurry is delivered from the slurry inlet 250 into the mold 200 and fills the slurry cavity 230. Next, the slurry flows through the interval between the slurry chamber 230 and the buffer tank 240a and fills the buffer tank 240 a. Next, the slurry flows through the gap between the buffer tank 240a and the buffer tank 240b and fills the buffer tank 240 b. Finally, the slurry in the buffer tank 240b is extruded at the gap 270 between the upper and lower molds 210 and 220.
In the die 200 according to the present disclosure, as shown in fig. 4, the lower body 220 includes two or more buffer grooves (e.g., buffer grooves 240a, 240 b). In the flow of the pulp from the pulp inlet 250 to the gap 270, due to the provision of two or more buffer reservoirs, both the buffering stroke and the buffering effect provided are significantly improved compared to the prior art, resulting in a more even distribution of the pulp in the last buffer reservoir. Because the distribution of the slurry in the last buffer slot is more uniform, the slurry can be more uniformly distributed in the width direction of the die 200 in the die 200 before being extruded out, so that the slurry extruded out from the gap 270 is more uniformly distributed in the width direction of the die, and the uniformity of the coating thickness is improved.
In the die 200 according to the present disclosure, as shown in fig. 4 and 6, the lower die body 220 includes two or more slurry inlets 250. Due to the provision of two or more slurry inlets 250 in the width direction of the mould, slurry can be dispersedly fed from these slurry inlets 250 into the mould 200, resulting in a more even distribution of slurry in the slurry chamber 230.
Although specific embodiments of the disclosure have been described, those skilled in the art will recognize that certain modifications may be within the scope of the disclosure. For that reason, the following claims should be studied to determine the true scope and content of this disclosure.
Claims (8)
1. A extrusion coating die for coating a lithium ion battery pole piece is characterized by comprising:
an upper die body including a slurry outlet; and
the lower die body comprises a slurry cavity and two or more buffer grooves, and the rear side of the lower die body is provided with a slurry inlet;
wherein, when the upper die body and the lower die body are assembled, a gap in the width direction of the die exists between the upper die body and the lower die body on the front side opposite to the slurry inlet, and
wherein the slurry chamber is located between the slurry inlet and the two or more surge tanks are located between the slurry chamber and the gap in a direction from the slurry inlet to the gap.
2. The die of claim 1 wherein the bottom die body has two or more slurry inlets on the back side.
3. The die of claim 2 wherein the two or more slurry inlets are uniformly positioned across the width of the die.
4. The die of claim 2 wherein the two or more slurry inlets are non-uniformly positioned across the width of the die.
5. The die of claim 1 wherein the two or more buffer slots taper in depth in a direction from the slurry inlet to the gap.
6. The die of claim 1 wherein the bottom surfaces of the two or more cushion grooves are generally semi-circular.
7. The die of claim 1, wherein the bottom surfaces of the two or more buffer channels are shaped as a portion of an ellipse.
8. The die of claim 6 wherein the radii of the bottom surfaces of the two or more buffer slots decrease in a direction from the slurry inlet to the gap.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121511163.8U CN216137543U (en) | 2021-07-05 | 2021-07-05 | Extrusion type coating die for coating lithium ion battery pole piece |
| PCT/CN2022/103631 WO2023280105A1 (en) | 2021-07-05 | 2022-07-04 | Extrusion coating mold for coating lithium ion battery pole pieces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121511163.8U CN216137543U (en) | 2021-07-05 | 2021-07-05 | Extrusion type coating die for coating lithium ion battery pole piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216137543U true CN216137543U (en) | 2022-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121511163.8U Active CN216137543U (en) | 2021-07-05 | 2021-07-05 | Extrusion type coating die for coating lithium ion battery pole piece |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN216137543U (en) |
| WO (1) | WO2023280105A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115513408A (en) * | 2022-10-13 | 2022-12-23 | 重庆石墨烯研究院有限公司 | Lithium battery cathode and preparation method thereof |
| WO2023280105A1 (en) * | 2021-07-05 | 2023-01-12 | Damitz Thomas Gerhard Wilhelm | Extrusion coating mold for coating lithium ion battery pole pieces |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117139066B (en) * | 2023-10-30 | 2024-04-05 | 宁德时代新能源科技股份有限公司 | Coating mechanism and coating device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101786067A (en) * | 2010-01-23 | 2010-07-28 | 深圳市浩能科技有限公司 | Porous feed type extrusion head |
| CN101773896A (en) * | 2010-01-23 | 2010-07-14 | 深圳市浩能科技有限公司 | Adjustable clearance type extrusion head with multiple pressure chambers |
| CN202238514U (en) * | 2011-09-14 | 2012-05-30 | 深圳市赢合科技股份有限公司 | Coating die head of pole piece coating machine |
| JP6096077B2 (en) * | 2013-07-25 | 2017-03-15 | オートモーティブエナジーサプライ株式会社 | Coating head and coating apparatus using the same |
| CN103551279A (en) * | 2013-11-15 | 2014-02-05 | 东南大学 | Extrusion coating die head for coating power lithium battery pole piece |
| CN209791896U (en) * | 2019-04-29 | 2019-12-17 | 江西鸿格科技有限公司 | novel precision extrusion die head of coating machine |
| CN110302942B (en) * | 2019-07-17 | 2024-05-24 | 宁波维科电池有限公司 | Coating die head for single or multiple groups of lithium battery pole pieces |
| CN211412553U (en) * | 2019-10-17 | 2020-09-04 | 龙能科技(宁夏)有限责任公司 | Coating die head and feed mechanism of multitube feeding |
| CN212189874U (en) * | 2019-12-04 | 2020-12-22 | 银隆新能源股份有限公司 | Die head of coating machine |
| CN216137543U (en) * | 2021-07-05 | 2022-03-29 | 托马斯·吉哈德·维尔海姆·达米兹 | Extrusion type coating die for coating lithium ion battery pole piece |
-
2021
- 2021-07-05 CN CN202121511163.8U patent/CN216137543U/en active Active
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2022
- 2022-07-04 WO PCT/CN2022/103631 patent/WO2023280105A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023280105A1 (en) * | 2021-07-05 | 2023-01-12 | Damitz Thomas Gerhard Wilhelm | Extrusion coating mold for coating lithium ion battery pole pieces |
| CN115513408A (en) * | 2022-10-13 | 2022-12-23 | 重庆石墨烯研究院有限公司 | Lithium battery cathode and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| WO2023280105A1 (en) | 2023-01-12 |
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