CN111106303A - Preparation method of nickel tab with heat-resistant insulating coating - Google Patents
Preparation method of nickel tab with heat-resistant insulating coating Download PDFInfo
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- CN111106303A CN111106303A CN201911355633.3A CN201911355633A CN111106303A CN 111106303 A CN111106303 A CN 111106303A CN 201911355633 A CN201911355633 A CN 201911355633A CN 111106303 A CN111106303 A CN 111106303A
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- 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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- General Chemical & Material Sciences (AREA)
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- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a preparation method of a nickel electrode lug with a heat-resistant insulating coating, which comprises the following steps: (a) uniformly coating heat-resistant insulating organic slurry on two surfaces of a nickel tab (1) through a coating head, wherein the width of the heat-resistant insulating organic slurry is larger than that of a tab glue (3), and quickly drying the heat-resistant insulating organic slurry by using electric hot air after the heat-resistant insulating organic slurry is coated to form a heat-resistant insulating coating (2); (b) and pressing the tab glue (3) on the nickel tab (1) coated with the heat-resistant insulating coating (2) in a hot pressing mode. The coating has high heat-resistant temperature, can not melt during top sealing, is an insulating material and can not conduct electrons and ions, so that the insulating isolation of the nickel tab and the aluminum layer can be well realized after the top sealing, the control precision of the top sealing process can be properly reduced, and the top sealing processing window is widened. The battery manufactured by the nickel lug can not generate the problem of corrosion of the nickel lug in the long-term use and storage process.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a nickel tab with a heat-resistant insulating coating.
Background
In the consumer electronics field, pouch batteries have taken an absolute mainstream. With the continuous improvement of the energy density requirement, the proportion of the soft package battery in the fields of power and energy storage is also improved year by year. However, the soft package battery has a fatal problem that electrochemical corrosion of a packaging material is easy to occur, liquid leakage is generated, and the battery is out of work. Most corrosion occurs slowly and is not detected effectively initially, which greatly reduces its reliability over long periods of use.
The outer packaging material of the soft package battery is an aluminum plastic film and consists of a three-layer structure comprising
(1) The nylon layer is arranged on the outermost side, so that oxygen in the air can be prevented from permeating, and meanwhile, the aluminum layer is ensured to have good plasticity;
(2) the aluminum layer is arranged in the middle of the aluminum layer, can isolate the permeation of external moisture, and has certain strength to prevent external mechanical damage;
(3) the polypropylene layer, at the innermost side, is not dissolved or swelled by the electrolyte, and has an insulating effect to prevent the electrolyte and the negative electrode from contacting the aluminum layer to cause corrosion.
During packaging, the packaging aluminum foil is folded in half, the polypropylene surfaces are opposite, certain heat (generally more than 180 ℃) is supplied to the nylon layer, the heat is transferred to the polypropylene layer through the aluminum layer, the polypropylene is melted, certain pressure is applied to mix and melt the two layers of melted polypropylene, and after mutual fusion and cooling for a period of time, the two layers of packaging aluminum foils are bonded together through the polypropylene, so that the purpose of packaging is achieved.
When the top is packaged, a positive electrode aluminum lug and a negative electrode nickel lug are clamped between two layers of aluminum-plastic films, the packaging difficulty is increased, and the problem is easy to occur. The positive electrode tab and the negative electrode tab of the naked electric core are respectively provided with a tab glue (similar to polypropylene in an aluminum plastic film, and the property is similar to that of polypropylene, and can be mixed with the polypropylene), so that part of the tabs are sealed in the aluminum plastic film through the tab glue during top sealing, and other areas on the top are bonded through the polypropylene to achieve the sealing effect. For the nickel tab of the top sealing part, once the process is not well controlled, the nickel tab is easy to contact with the aluminum layer, the aluminum layer is damaged due to the fact that electrochemical corrosion is easy to occur due to the existence of potential difference, and serious problems such as swelling, liquid leakage and the like occur when external moisture enters the battery. Even if the control of the top sealing process is very strict, the problem of nickel-aluminum contact in a certain proportion still exists, and some initial contacts are very small and are continuously increased in the using process or the storage process, so that great risks are brought.
Disclosure of Invention
In view of the above, the present invention is to provide a method for preparing a nickel tab with a heat-resistant insulating coating, which is not melted at normal packaging temperature and stably coated on the surface of the nickel tab, thereby achieving the purpose of insulating the nickel tab from an aluminum layer.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a preparation method of a nickel tab with a heat-resistant insulating coating, which comprises the following steps:
(a) uniformly coating heat-resistant insulating organic slurry on two surfaces of a nickel tab through a coating head, wherein the width of the heat-resistant insulating organic slurry is larger than that of a tab glue, and quickly drying the heat-resistant insulating organic slurry by using electric hot air after the heat-resistant insulating organic slurry is coated to form a heat-resistant insulating coating;
(b) and pressing the tab glue on the nickel tab coated with the heat-resistant insulating coating in a hot pressing mode to finish the manufacturing.
Preferably, the heat-resistant insulating coating layer includes a silicone resin, a polyimide resin, a polyphenylene ether resin, a polybenzimidazole resin.
Preferably, the heat-resistant insulating coating is wider than the tab glue by 2 mm.
Preferably, the thickness of the heat-resistant insulating coating is 5-10 μm.
Preferably, the drying temperature of the electric hot air is controlled to be 120-150 ℃.
The invention has the following beneficial effects:
1) the invention provides a nickel tab preparation method with a heat-resistant insulating coating, the heat-resistant temperature of the coating is high, melting can not occur during top sealing, and meanwhile, the coating is made of insulating materials and can not conduct electrons and ions, so that the insulating isolation of the nickel tab and an aluminum layer can be well realized after top sealing, the control precision of a top sealing process can be properly reduced, and a top sealing processing window is widened;
2) the invention provides a preparation method of a nickel lug with a heat-resistant insulating coating, and a battery manufactured by the nickel lug cannot generate the problem of corrosion of the nickel lug in the long-term use and storage processes.
Drawings
FIG. 1 is a schematic view of a nickel tab with a heat resistant insulating coating according to the present invention;
wherein, 1 is a nickel lug, 2 is a heat-resistant insulating coating, and 3 is a lug glue.
Detailed Description
The specific embodiment of the invention provides a preparation method of a nickel tab with a heat-resistant insulating coating, which comprises the following steps:
(a) uniformly coating heat-resistant insulating organic slurry on two surfaces of a nickel tab 1 through a coating head, wherein the width of the heat-resistant insulating organic slurry is larger than that of a tab glue 3, and quickly drying the heat-resistant insulating organic slurry by using electric hot air after the heat-resistant insulating organic slurry is coated to form a heat-resistant insulating coating 2;
(b) and pressing the tab glue (3) on the nickel tab (1) coated with the heat-resistant insulating coating (2) in a hot pressing mode to finish the manufacturing.
Preferably, the heat-resistant insulating coating 2 includes a silicone resin, a polyimide resin, a polyphenylene ether resin, a polybenzimidazole resin.
Preferably, the heat-resistant insulating coating 2 is wider than the tab 3 by 2 mm.
Preferably, the thickness of the heat-resistant insulating coating 2 is 5-10 μm.
Preferably, the drying temperature of the electric hot air is controlled to be 120-150 ℃.
So that the manner in which the features and aspects of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings.
Example 1:
1. preparation of nickel electrode lug with heat-resistant insulating coating
(a) Uniformly coating heat-resistant insulating organic slurry on two surfaces of a nickel tab 1 through a coating head, wherein the thickness of the coating is 5 mu m, the width of the coating is 2mm wider than that of a tab 3, and the coating is quickly dried by electric hot air at 120 ℃ after the coating is finished to form a heat-resistant insulating coating 2;
(b) and pressing the tab glue 3 on the nickel tab 1 coated with the heat-resistant insulating coating 2 in a hot pressing mode to finish the manufacturing.
2. Lithium ion battery preparation
And (3) carrying out top sealing on the nickel tab with the heat-resistant insulating coating prepared in the step (1), wherein the top sealing temperature is 180 +/-5 ℃, carrying out an insulation test on the packaged battery (if the nickel tab is in contact with the aluminum layer between the nickel tab and the edge of the aluminum-plastic film, the test cannot pass), and continuing the subsequent procedures on the battery passing the test to prepare the battery core.
3. High temperature storage test of lithium ion battery
After charging 1000 batteries to 50% SOC, placing the batteries in a constant temperature room at 45 +/-3 ℃, storing for 3 months, and checking the corrosion condition of the nickel tab every month.
Example 2:
1. preparation of nickel electrode lug with heat-resistant insulating coating
(a) Uniformly coating heat-resistant insulating organic slurry on two surfaces of a nickel tab 1 through a coating head, wherein the thickness of the coating is 5 mu m, the width of the coating is 2mm wider than that of a tab 3, and the coating is quickly dried by electric hot air at 120 ℃ after the coating is finished to form a heat-resistant insulating coating 2;
(b) and pressing the tab glue 3 on the nickel tab 1 coated with the heat-resistant insulating coating 2 in a hot pressing mode to finish the manufacturing.
2. Lithium ion battery preparation
And (3) carrying out top sealing on the nickel tab with the heat-resistant insulating coating prepared in the step (1), wherein the top sealing temperature is 200 +/-5 ℃, carrying out an insulation test on the packaged battery (if the nickel tab is in contact with the aluminum layer between the nickel tab and the edge of the aluminum-plastic film, the test cannot pass), and continuing the subsequent procedures on the battery passing the test to prepare the battery core.
3. High temperature storage test of lithium ion battery
After charging 1000 batteries to 50% SOC, placing the batteries in a constant temperature room at 45 +/-3 ℃, storing for 3 months, and checking the corrosion condition of the nickel tab every month.
Example 3:
1. preparation of nickel electrode lug with heat-resistant insulating coating
(a) Uniformly coating heat-resistant insulating organic slurry on two surfaces of a nickel tab 1 through a coating head, wherein the thickness of the coating is 5 mu m, the width of the coating is 2mm wider than that of a tab 3, and the coating is quickly dried by electric hot air at 120 ℃ after the coating is finished to form a heat-resistant insulating coating 2;
(b) and pressing the tab glue 3 on the nickel tab 1 coated with the heat-resistant insulating coating 2 in a hot pressing mode to finish the manufacturing.
2. Lithium ion battery preparation
And (3) carrying out top sealing on the nickel tab with the heat-resistant insulating coating prepared in the step (1), wherein the top sealing temperature is 220 +/-5 ℃, carrying out an insulation test on the packaged battery (if the nickel tab is in contact with the aluminum layer between the nickel tab and the edge of the aluminum-plastic film, the test cannot pass), and continuing the subsequent procedures on the battery passing the test to prepare the battery core.
3. High temperature storage test of lithium ion battery
After charging 1000 batteries to 50% SOC, placing the batteries in a constant temperature room at 45 +/-3 ℃, storing for 3 months, and checking the corrosion condition of the nickel tab every month.
Example 4:
1. preparation of nickel electrode lug with heat-resistant insulating coating
(a) Uniformly coating heat-resistant insulating organic slurry on two surfaces of a nickel tab 1 through a coating head, wherein the thickness of the coating is 10 mu m, the width of the coating is 2mm wider than that of a tab 3, and after the coating is finished, the coating is quickly dried by electric hot air at 150 ℃ to form a heat-resistant insulating coating 2;
(b) and pressing the tab glue 3 on the nickel tab 1 coated with the heat-resistant insulating coating 2 in a hot pressing mode to finish the manufacturing.
2. Lithium ion battery preparation
And (3) carrying out top sealing on the nickel tab with the heat-resistant insulating coating prepared in the step (1), wherein the top sealing temperature is 180 +/-5 ℃, carrying out an insulation test on the packaged battery (if the nickel tab is in contact with the aluminum layer between the nickel tab and the edge of the aluminum-plastic film, the test cannot pass), and continuing the subsequent procedures on the battery passing the test to prepare the battery core.
3. High temperature storage test of lithium ion battery
After charging 1000 batteries to 50% SOC, placing the batteries in a constant temperature room at 45 +/-3 ℃, storing for 3 months, and checking the corrosion condition of the nickel tab every month.
Example 5:
1. preparation of nickel electrode lug with heat-resistant insulating coating
(a) Uniformly coating heat-resistant insulating organic slurry on two surfaces of a nickel tab 1 through a coating head, wherein the thickness of the coating is 10 mu m, the width of the coating is 2mm wider than that of a tab 3, and after the coating is finished, the coating is quickly dried by electric hot air at 150 ℃ to form a heat-resistant insulating coating 2;
(b) and pressing the tab glue 3 on the nickel tab 1 coated with the heat-resistant insulating coating 2 in a hot pressing mode to finish the manufacturing.
2. Lithium ion battery preparation
And (3) carrying out top sealing on the nickel tab with the heat-resistant insulating coating prepared in the step (1), wherein the top sealing temperature is 200 +/-5 ℃, carrying out an insulation test on the packaged battery (if the nickel tab is in contact with the aluminum layer between the nickel tab and the edge of the aluminum-plastic film, the test cannot pass), and continuing the subsequent procedures on the battery passing the test to prepare the battery core.
3. High temperature storage test of lithium ion battery
After charging 1000 batteries to 50% SOC, placing the batteries in a constant temperature room at 45 +/-3 ℃, storing for 3 months, and checking the corrosion condition of the nickel tab every month.
Example 6:
1. preparation of nickel electrode lug with heat-resistant insulating coating
(a) Uniformly coating heat-resistant insulating organic slurry on two surfaces of a nickel tab 1 through a coating head, wherein the thickness of the coating is 10 mu m, the width of the coating is 2mm wider than that of a tab 3, and after the coating is finished, the coating is quickly dried by electric hot air at 150 ℃ to form a heat-resistant insulating coating 2;
(b) and pressing the tab glue 3 on the nickel tab 1 coated with the heat-resistant insulating coating 2 in a hot pressing mode to finish the manufacturing.
2. Lithium ion battery preparation
And (3) carrying out top sealing on the nickel tab with the heat-resistant insulating coating prepared in the step (1), wherein the top sealing temperature is 220 +/-5 ℃, carrying out an insulation test on the packaged battery (if the nickel tab is in contact with the aluminum layer between the nickel tab and the edge of the aluminum-plastic film, the test cannot pass), and continuing the subsequent procedures on the battery passing the test to prepare the battery core.
3. High temperature storage test of lithium ion battery
After charging 1000 batteries to 50% SOC, placing the batteries in a constant temperature room at 45 +/-3 ℃, storing for 3 months, and checking the corrosion condition of the nickel tab every month.
Comparative example 1:
1. lithium ion battery preparation
And (3) carrying out top sealing by using a conventional nickel tab, wherein the top sealing temperature is 180 +/-5 ℃, carrying out an insulation test on the packaged battery (if the nickel tab is in contact with an aluminum layer, the test cannot pass) and continuing the subsequent procedures of the battery passing the test to manufacture the battery core.
2. High temperature storage test of lithium ion battery
After charging 1000 batteries to 50% SOC, placing the batteries in a constant temperature room at 45 +/-3 ℃, storing for 3 months, and checking the corrosion condition of the nickel tab every month.
Comparative example 2:
1. lithium ion battery preparation
And (3) carrying out top sealing by using a conventional nickel tab, wherein the top sealing temperature is 200 +/-5 ℃, carrying out an insulation test on the packaged battery (if the nickel tab is in contact with an aluminum layer, the test cannot pass) and continuing the subsequent procedures of the battery passing the test to manufacture the battery core.
2. High temperature storage test of lithium ion battery
After charging 1000 batteries to 50% SOC, placing the batteries in a constant temperature room at 45 +/-3 ℃, storing for 3 months, and checking the corrosion condition of the nickel tab every month.
Comparative example 3:
1. lithium ion battery preparation
And (3) carrying out top sealing by using a conventional nickel tab, wherein the top sealing temperature is 220 +/-5 ℃, carrying out an insulation test on the packaged battery (if the nickel tab is in contact with an aluminum layer, the test cannot pass) and continuing the subsequent procedures of the battery passing the test to manufacture the battery core.
2. High temperature storage test of lithium ion battery
After charging 1000 batteries to 50% SOC, placing the batteries in a constant temperature room at 45 +/-3 ℃, storing for 3 months, and checking the corrosion condition of the nickel tab every month.
Remarking: the aluminum plastic films used in the preparation process are all 110 mu m (wherein the nylon layer is 20 mu m, the aluminum layer is 40 mu m, and the polypropylene layer is 40 mu m)
TABLE 1
It can be seen from comparative examples 1-3 that, when the top seal temperature is raised to 220 ℃ by using the conventional nickel tab, the insulation test pass rate is obviously reduced, which indicates that at higher temperature, the polypropylene layer has good fluidity, and the probability of contact between the nickel tab and the aluminum layer is increased. In the embodiments 1-6, the insulation test can pass 100% in a wide temperature range of 180-220 ℃. Indicating that the heat resistant insulation layer has a wide high temperature stability window.
As can be seen from comparative example 1, even though the top-sealing process was well controlled and no insulation test failure occurred, the cell still exhibited a small amount of aluminum layer corrosion after 2 months of storage. The method shows that the conventional nickel tab is inevitably in micro-contact with the aluminum layer, and the micro-contact is gradually enlarged in the storage process, so that the aluminum layer is corroded and leaked finally.
It can be seen from examples 3 and 6 that after top-sealing at 220 c, a very small amount of corrosion also occurred after 3 months of storage. While the top-sealed cells at 180 c and 200 c did not appear. It is stated that the high temperature resistant coating used in the present invention must not exceed 220 c. In fact, under the condition of ensuring good packaging, the packaging temperature of 180-200 ℃ can meet various requirements, so that the problem of corrosion of the nickel electrode lug in the storage process can be completely solved at the conventional packaging temperature.
The above matters related to the common general knowledge are not described in detail and can be understood by those skilled in the art.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (5)
1. A method of making a nickel tab with a heat resistant insulating coating, the method comprising:
(a) uniformly coating heat-resistant insulating organic slurry on two surfaces of a nickel tab (1) through a coating head, wherein the width of the heat-resistant insulating organic slurry is larger than that of a tab glue (3), and quickly drying the heat-resistant insulating organic slurry by using electric hot air after the heat-resistant insulating organic slurry is coated to form a heat-resistant insulating coating (2);
(b) and pressing the tab glue (3) on the nickel tab (1) coated with the heat-resistant insulating coating (2) in a hot pressing mode to finish the manufacturing.
2. The method of making a nickel tab with a heat resistant insulating coating according to claim 1, wherein: the heat-resistant insulating coating (2) comprises organic silicon resin, polyimide resin, polyphenyl ether resin and polybenzimidazole resin.
3. The method of making a nickel tab with a heat resistant insulating coating according to claim 1, wherein: the heat-resistant insulating coating (2) is wider than the glue width of the tab (3) by 2 mm.
4. The method of making a nickel tab with a heat resistant insulating coating according to claim 1, wherein: the thickness of the heat-resistant insulating coating (2) is 5-10 mu m.
5. The method of making a nickel tab with a heat resistant insulating coating according to claim 1, wherein: the drying temperature of the electric hot air is controlled to be 120-150 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911355633.3A CN111106303A (en) | 2019-12-25 | 2019-12-25 | Preparation method of nickel tab with heat-resistant insulating coating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911355633.3A CN111106303A (en) | 2019-12-25 | 2019-12-25 | Preparation method of nickel tab with heat-resistant insulating coating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111816831A (en) * | 2020-08-25 | 2020-10-23 | 珠海冠宇电池股份有限公司 | Prevent electric core utmost point ear of short circuit |
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