CN111900323A - Preparation method of pole piece and preparation method of battery cell - Google Patents
Preparation method of pole piece and preparation method of battery cell Download PDFInfo
- Publication number
- CN111900323A CN111900323A CN202010577122.2A CN202010577122A CN111900323A CN 111900323 A CN111900323 A CN 111900323A CN 202010577122 A CN202010577122 A CN 202010577122A CN 111900323 A CN111900323 A CN 111900323A
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- pole piece
- valve
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- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 238000000576 coating method Methods 0.000 claims abstract description 193
- 239000011248 coating agent Substances 0.000 claims abstract description 189
- 238000003466 welding Methods 0.000 claims abstract description 93
- 238000010992 reflux Methods 0.000 claims description 34
- 239000012530 fluid Substances 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 12
- 239000012943 hotmelt Substances 0.000 claims description 6
- 238000010030 laminating Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000005476 soldering Methods 0.000 claims description 2
- 239000002002 slurry Substances 0.000 abstract description 9
- 239000013543 active substance Substances 0.000 abstract description 6
- 239000011247 coating layer Substances 0.000 abstract description 3
- 239000010410 layer Substances 0.000 abstract description 2
- 238000007755 gap coating Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
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Classifications
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- 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
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- 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
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- 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
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides two preparation methods of pole pieces, which comprise single-side coating and double-side simultaneous coating, wherein the two coating modes are that only the welding position of a current carrier is reserved on one side of the pole piece, and the other side is still coated with an active substance layer; and meanwhile, the coating head with the double backflow valves is adopted for coating, so that even if the coating is stopped for reserving a current carrier welding area midway, the problem that the head and the tail of a coating layer near the current carrier welding area are thinned due to the influence of time on slurry backflow is avoided, and the uniformity of pole piece coating is ensured. In addition, the invention also provides a preparation method of the battery cell.
Description
Technical Field
The invention relates to the field of lithium batteries, in particular to a preparation method of a pole piece and a preparation method of a battery cell.
Background
With the development of the lithium battery industry, the fast battery cell charging process is popularized in the market at present, and in order to meet the demand of the fast charging process and reduce the internal resistance of the battery cell, a common method for preparing a pole piece in the industry at present is to transfer positive and negative current carriers (pole lugs) to one third to two thirds of the pole piece. General ultrasonic welding in the present trade of welding of current-carrying body, and adopt ultrasonic welding technology to need bonding tool cooperation welding seat to carry out thermal fusion behind high-frequency oscillation with mass flow body and current-carrying body, require very high to mass flow body and current-carrying body surface cleanliness factor, consequently, will realize that ultrasonic welding technology must all get rid of the coating that has the current-carrying body's mass flow body double-sided region of welding current-carrying body, guarantees simultaneously that mass flow body and current-carrying body all have high cleanliness factor. Based on this, the preparation of the electrode plate in the industry at present usually adopts double-sided gap coating to realize the ultrasonic welding of the carrier fluid. However, the removal of the active substances on the two sides of the welding position of the current carrier can cause the loss of the active substances of the pole piece and the low utilization rate of the slurry, thereby not only increasing the manufacturing cost, but also reducing the energy density. In addition, the influence of slurry characteristics and the reaction time capability of an equipment coating backflow valve when the double-sided gap coating is carried out on the reserved gap can cause the problems of larger size fluctuation of the reserved gap area and longer size elimination of the head and the tail of the gap area coating.
In view of the above, it is necessary to provide a technical solution to the above problems.
Disclosure of Invention
One object of the present invention is: aiming at the problems, the invention provides a preparation method of the pole piece, and the pole piece prepared by the invention has the advantages that the utilization rate of active substances of the pole piece is increased, and the problem of head and tail thinning of a pole piece coating gap area is effectively improved, so that the preparation cost of a battery cell is reduced and the energy density is improved.
In order to achieve the purpose, the invention adopts the following two technical schemes:
1) a preparation method of a pole piece comprises the following steps:
s1, after the welding position of the current carrier on the pole piece is set, two coating heads are used for coating the two surfaces of the pole piece simultaneously; when the two coating heads reach the welding position of the current carrier, one coating head stops coating until the coating head passes through the welding position of the current carrier and then continues coating, and the other coating head keeps continuing coating;
s2, after coating the pole piece, welding the current carrier at the set welding position of the pole piece, wherein the welding comprises at least one of hot melt welding, spot welding and laser welding, and the preparation of the pole piece is completed;
wherein, in the step S1, the application head stopping application at the carrier fluid soldering position is equipped with an independent application valve and two return valves; the coating head is connected with the coating valve, and the two reflux valves are communicated with the coating valve; when the coating head does not reach the carrier fluid welding position, keeping a reflux valve in an open state; closing the return valve when the applicator head reaches the carrier fluid bonding position; and after the coating head passes through the carrier fluid welding position, opening the other reflux valve to continue coating.
Preferably, the coating head, which maintains continuous coating, is also equipped with a separate coating valve and two return valves.
Preferably, the coating is performed while maintaining the same moving speed of the two coating heads.
2) A preparation method of a pole piece comprises the following steps:
s1, after the welding position of the current carrier on the pole piece is set, a coating head is used for coating one side of the pole piece, when the coating head reaches the welding position of the current carrier, the coating is stopped until the current carrier passes through the welding position of the current carrier, and then the coating is continued; after coating of one surface containing the current-carrying fluid welding position is completed, the other surface of the pole piece is kept in a continuous coating state by the coating head until the pole piece is coated;
s2, after coating the pole piece, welding the current carrier at the set welding position of the pole piece, wherein the welding comprises at least one of hot melt welding, spot welding and laser welding, and the preparation of the pole piece is completed;
wherein, in the step S1, the coating head is provided with an independent coating valve and two return valves; the coating head is connected with the coating valve, and the two reflux valves are communicated with the coating valve; when the coating head does not reach the carrier fluid welding position, keeping a reflux valve in an open state; closing the return valve when the applicator head reaches the carrier fluid bonding position; and after the coating head passes through the carrier fluid welding position, opening the other reflux valve to continue coating.
Preferably, the two backflow valves and the coating valve are communicated with each other in pairs.
Preferably, the two reflux valves are a first reflux valve and a second reflux valve, the first reflux valve is connected to one side of the coating valve, and the second reflux valve is connected to the other side of the coating valve.
Another objective of the present invention is to provide a method for preparing a battery cell, including the steps of obtaining a pole piece by any one of the above methods, and winding or laminating the obtained pole piece and a diaphragm to prepare a battery cell, thereby completing the preparation of the battery cell.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention provides two preparation methods of pole pieces, which comprise single-side coating and double-side simultaneous coating, wherein the two coating modes are that only the welding position of a current carrier is reserved on one side of the pole piece, and the other side is still coated with an active substance layer; and meanwhile, the coating head with the double backflow valves is adopted for coating, so that even if the coating is stopped for reserving a current carrier welding area midway, the problem that the head and the tail of a coating layer near the current carrier welding area are thinned due to the influence of time on slurry backflow is avoided, and the uniformity of pole piece coating is ensured.
2) Compared with single-side coating, double-side simultaneous coating has higher coating efficiency, and the problem of thinning of the head and the tail of the coating layer near a current carrier welding area due to the influence of double-coating-head simultaneous coating is solved, so that the battery core prepared by the invention not only improves the energy density of the battery, but also improves the production efficiency, and solves the problem that the current double-side gap coating cannot be matched with coating with a single-side current collector pole piece structure.
3) The preparation method of the pole piece is simple, the related coating tool is well matched with the coating process, and the pole piece is suitable for industrial mass production.
Drawings
FIG. 1 is a schematic view of the structure of the pole piece coating tool of the present invention.
FIG. 2 is a schematic structural diagram of the electrode sheet prepared by the present invention.
In the figure: 1-coating head; 2-coating valve; 3-a reflux valve; 4-a carrier fluid; and 5, collecting the current.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantages will be described in further detail below with reference to the following detailed description and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.
Example 1
As shown in fig. 1-2, a method for preparing a pole piece includes the following steps:
s1, after the welding position of the current carrier 4 on the pole piece is set, two coating heads 1 are used for coating the two sides of the pole piece simultaneously; when the two coating heads 1 reach the welding position of the carrier fluid 4, one coating head 1 stops coating until the coating head passes through the welding position of the carrier fluid 4 and then continues coating, and the other coating head 1 keeps continuing coating;
s2, after coating the pole piece, welding the current carrier 4 at the set welding position of the pole piece, wherein the welding comprises at least one of hot melt welding, spot welding and laser welding, and the preparation of the pole piece is completed;
wherein, in the step S1, the application head 1 stopping application at the bonding position of the carrier fluid 4 is provided with an independent application valve 2 and two return valves 3; the coating head 1 is connected with a coating valve 2, and the two reflux valves 3 are both communicated with the coating valve 2; when the coating head 1 does not reach the welding position of the carrier fluid 4, keeping a reflux valve 3 in an open state; when the coating head 1 reaches the welding position of the carrier fluid 4, the reflux valve 3 is closed; after the coating head 1 passes through the welding position of the carrier fluid 4, another reflux valve 3 is opened to continue coating.
Specifically, the coating head 1, the reflux valve 3 and the coating valve 2 are all controlled by a coating control end, and the coating head 1 is communicated with the coating valve 2, and the reflux valve 3 is communicated with the coating valve 2 through slurry flow pipelines. After the welding position of the carrier fluid 4 on the pole piece is set in the coating control end, the coating control end drives the two coating heads 1 to simultaneously move along the current collector 5, the two coating heads 1 keep the same moving speed for coating, and then active substances are coated on two sides of the current collector 5, wherein when the two sides are simultaneously coated, slurry flows between the two backflow valves 3, the slurry can flow back and forth between the communicating pipelines of the two backflow valves 3, but the coating is controlled by the single backflow valve 3 during the coating; when the coating head 1 is coated to a preset carrier fluid 4 welding area, one coating head 1 keeps continuously coating, the other coating head 1 stops coating, the coating control end sends a closing signal to the originally opened backflow valve 3, the coating work of the coating head 1 can be stopped after the backflow valve 3 is closed, but the coating heads 1 still continuously move at the same time, namely the two coating heads 1 keep the same tape-moving speed; after the welding position of the current carrier 4, the coating control end sends an opening signal to the backflow valve 3 which is not opened originally, the backflow valve 3 works, flowing slurry is provided for the two backflow valves 3, the two backflow valves 3 correspond alternately, the problems that a thinning area and a thinning width are difficult to control when coating is caused by the fact that the reaction speed is slow when the backflow valve 3 is opened instantly after being closed are solved, the coating control end is matched with a pole piece coating process, the reaction capacity of stopping and starting flowing of slurry of coating equipment is greatly improved, and the problem that the thinning area exists near a reserved welding area is solved. Further, the two coating heads 1 are a first coating head and a second coating head, the coating is stopped when the first coating head reaches the carrier fluid welding position, and the coating is continued when the second coating head reaches the carrier fluid welding position.
Further, the coating head 1, which keeps continuous coating, is also equipped with an independent coating valve 2 and two return valves 3. That is, in the double-head 1 coating apparatus, 4 return valves 3 are provided in total, and two return valves 3 are used in cooperation with one coating head.
Further, the two return valves 3 and the coating valves 2 are communicated with each other two by two.
Further, the two return valves 3 are a first return valve connected to one side of the coating valve 2 and a second return valve connected to the other side of the coating valve 2.
Example 2
As shown in fig. 1-2, a method for preparing a pole piece includes the following steps:
s1, after the welding position of the current carrier 4 on the pole piece is set, single-side coating is carried out on the pole piece by the coating head 1, when the coating head 1 reaches the welding position of the current carrier 4, the coating is stopped until the coating passes through the welding position of the current carrier 4, and then the coating is continued; after coating of one surface of the welding position containing the current carrier 4 is finished, the other surface of the pole piece is continuously coated by the coating head 1 until the pole piece is coated;
s2, after coating the pole piece, welding the current carrier 4 at the set welding position of the pole piece, wherein the welding comprises at least one of hot melt welding, spot welding and laser welding, and the preparation of the pole piece is completed;
wherein, in the step of S1, the coating head 1 is provided with an independent coating valve 2 and two return valves 3; the coating head 1 is connected with a coating valve 2, and the two reflux valves 3 are both communicated with the coating valve 2; when the coating head 1 does not reach the welding position of the carrier fluid 4, keeping a reflux valve 3 in an open state; when the coating head 1 reaches the welding position of the carrier fluid 4, the reflux valve 3 is closed; after the coating head 1 passes through the welding position of the carrier fluid 4, another reflux valve 3 is opened to continue coating. For the specific coating process, reference may be made to the specific coating process in example 1, which is not described herein again.
Further, the two return valves 3 and the coating valves 2 are communicated with each other two by two.
Further, the two return valves 3 are a first return valve connected to one side of the coating valve 2 and a second return valve connected to the other side of the coating valve 2.
Example 3
A method for preparing a battery cell, comprising the steps of winding or laminating the obtained pole piece and a diaphragm to prepare the battery cell by the pole piece obtained by the method for preparing the pole piece described in embodiment 1 or embodiment 2, and completing the preparation of the battery cell. On the premise of meeting the requirement of a quick charging process, the energy density of the battery prepared by the invention is further improved, and compared with the traditional quick charging battery, the energy density is improved by at least 2%, and the battery has a wider application prospect.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (7)
1. A preparation method of a pole piece is characterized by comprising the following steps:
s1, after the welding position of the current carrier on the pole piece is set, two coating heads are used for coating the two surfaces of the pole piece simultaneously; when the two coating heads reach the welding position of the current carrier, one coating head stops coating until the coating head passes through the welding position of the current carrier and then continues coating, and the other coating head keeps continuing coating;
s2, after coating the pole piece, welding the current carrier at the set welding position of the pole piece, wherein the welding comprises at least one of hot melt welding, spot welding and laser welding, and the preparation of the pole piece is completed;
wherein, in the step S1, the application head stopping application at the carrier fluid soldering position is equipped with an independent application valve and two return valves; the coating head is connected with the coating valve, and the two reflux valves are communicated with the coating valve; when the coating head does not reach the carrier fluid welding position, keeping a reflux valve in an open state; closing the return valve when the applicator head reaches the carrier fluid bonding position; and after the coating head passes through the carrier fluid welding position, opening the other reflux valve to continue coating.
2. The method of claim 1, wherein the coating head that maintains continuous coating is also equipped with a separate coating valve and two return valves.
3. The method for preparing the pole piece according to claim 1, wherein the coating is performed by keeping the same moving speed of the two coating heads.
4. A preparation method of a pole piece is characterized by comprising the following steps:
s1, after the welding position of the current carrier on the pole piece is set, a coating head is used for coating one side of the pole piece, when the coating head reaches the welding position of the current carrier, the coating is stopped until the current carrier passes through the welding position of the current carrier, and then the coating is continued; after coating of one surface containing the current-carrying fluid welding position is completed, the other surface of the pole piece is kept in a continuous coating state by the coating head until the pole piece is coated;
s2, after coating the pole piece, welding the current carrier at the set welding position of the pole piece, wherein the welding comprises at least one of hot melt welding, spot welding and laser welding, and the preparation of the pole piece is completed;
wherein, in the step S1, the coating head is provided with an independent coating valve and two return valves; the coating head is connected with the coating valve, and the two reflux valves are communicated with the coating valve; when the coating head does not reach the carrier fluid welding position, keeping a reflux valve in an open state; closing the return valve when the applicator head reaches the carrier fluid bonding position; and after the coating head passes through the carrier fluid welding position, opening the other reflux valve to continue coating.
5. The preparation method of the pole piece according to any one of claims 1 to 4, wherein the two reflux valves and the coating valve are communicated with each other pairwise.
6. The preparation method of the pole piece according to any one of claims 1 to 4, wherein the two reflux valves are a first reflux valve and a second reflux valve, the first reflux valve is connected to one side of the coating valve, and the second reflux valve is connected to the other side of the coating valve.
7. A preparation method of a battery cell is characterized by comprising the pole piece obtained by the preparation method of the pole piece in claim 1 or 4, and winding or laminating the obtained pole piece and a diaphragm to prepare the battery cell so as to finish the preparation of the battery cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010577122.2A CN111900323A (en) | 2020-06-23 | 2020-06-23 | Preparation method of pole piece and preparation method of battery cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010577122.2A CN111900323A (en) | 2020-06-23 | 2020-06-23 | Preparation method of pole piece and preparation method of battery cell |
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| Publication Number | Publication Date |
|---|---|
| CN111900323A true CN111900323A (en) | 2020-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010577122.2A Pending CN111900323A (en) | 2020-06-23 | 2020-06-23 | Preparation method of pole piece and preparation method of battery cell |
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| CN110773388A (en) * | 2019-11-15 | 2020-02-11 | 深圳市新嘉拓自动化技术有限公司 | Double-backflow double-gap coating valve device |
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Application publication date: 20201106 |