CN111446409A - Preparation method of long-durability lithium ion battery polymer tab - Google Patents
Preparation method of long-durability lithium ion battery polymer tab Download PDFInfo
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- CN111446409A CN111446409A CN202010429929.1A CN202010429929A CN111446409A CN 111446409 A CN111446409 A CN 111446409A CN 202010429929 A CN202010429929 A CN 202010429929A CN 111446409 A CN111446409 A CN 111446409A
- Authority
- CN
- China
- Prior art keywords
- tab
- tab glue
- metal belt
- lug
- glue
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 13
- 229920000642 polymer Polymers 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000003292 glue Substances 0.000 claims abstract description 41
- 229910052751 metal Inorganic materials 0.000 claims abstract description 36
- 239000002184 metal Substances 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000004140 cleaning Methods 0.000 claims abstract description 19
- 238000009832 plasma treatment Methods 0.000 claims abstract description 14
- 238000013329 compounding Methods 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 12
- 238000005520 cutting process Methods 0.000 claims abstract description 8
- 238000007493 shaping process Methods 0.000 claims abstract description 8
- 238000007689 inspection Methods 0.000 claims abstract description 3
- 238000012858 packaging process Methods 0.000 claims abstract description 3
- 238000010301 surface-oxidation reaction Methods 0.000 claims abstract description 3
- 239000010410 layer Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- -1 polypropylene Polymers 0.000 claims description 13
- 239000004743 Polypropylene Substances 0.000 claims description 11
- 229920001155 polypropylene Polymers 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 8
- 238000007747 plating Methods 0.000 claims description 8
- 229910000570 Cupronickel Inorganic materials 0.000 claims description 4
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 2
- 239000004745 nonwoven fabric Substances 0.000 claims description 2
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 claims description 2
- 239000011112 polyethylene naphthalate Substances 0.000 claims description 2
- 239000002356 single layer Substances 0.000 claims description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052744 lithium Inorganic materials 0.000 abstract description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 12
- 239000000853 adhesive Substances 0.000 description 12
- 230000001070 adhesive effect Effects 0.000 description 12
- 229910052802 copper Inorganic materials 0.000 description 12
- 239000010949 copper Substances 0.000 description 12
- 230000008569 process Effects 0.000 description 11
- 238000012545 processing Methods 0.000 description 11
- 238000004381 surface treatment Methods 0.000 description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 239000007921 spray Substances 0.000 description 7
- 239000003792 electrolyte Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000011068 loading method Methods 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 239000011265 semifinished product Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000002313 adhesive film Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
Abstract
The invention provides a preparation method of a long-durability lithium ion battery polymer tab, which comprises the following steps: (1) cleaning and deoiling the surface of a metal belt on a machine to remove oil, cleaning and drying, removing a surface oxidation film, cleaning and drying, and passivating the surface; (2) cutting the tab glue, performing plasma treatment on the surface of the cut tab glue, and detecting a dyne value of the treated tab glue, wherein the dyne value meets 45-60 dynes, and if the dyne value does not meet the requirement, repeating the plasma treatment on the surface of the tab glue until the tab glue is qualified to obtain a tab glue sheet; (3) and (3) carrying out on-machine belt leading on the metal belt processed in the step (1), pre-pasting the lug film processed in the step (2), shaping and bubble removing of the lug film, thermal compounding, shaping of the lug film, cutting of the metal belt, angle guiding of the metal belt, inspection and packaging processes, and thus finishing the preparation of the lug. The method provided by the invention solves the technical problem that the lithium battery tab in the prior art is poor in durability and stability.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a long-durability lithium ion battery polymer tab.
Background
The lithium ion battery mainly comprises a hard package and a soft package, and the two main differences are that the sealing materials of the shell are different, wherein the sealing material of the soft package lithium battery is an aluminum plastic film material matched with a polymer tab to achieve a sealing effect, compared with the hard package, the soft package lithium battery has the advantages that ① is good in safety performance, the soft package lithium battery can blow and crack due to thermal runaway and is not as explosive as a steel shell and aluminum shell battery cell, ② is light in weight, the soft package battery is 40% lighter than the steel shell lithium battery with the same capacity and 20% lighter than the aluminum shell battery, ③ is large in capacity, the soft package battery is 10-15% higher than the steel shell battery with the same specification and size and 5-10% higher than the aluminum shell battery, ④ is small in internal resistance, the self-energy consumption advantage of the lithium battery is greatly reduced, and the attractiveness and industrialization of each.
The stability and durability of the structure of the soft package lithium battery are closely related to the aluminum plastic film and the tab material. The polymer tab is made by respectively heating and compounding a polypropylene adhesive film and an aluminum, nickel or copper nickel-plated metal band, so the durability of a tab product is directly influenced by the bonding condition of the tab adhesive and the metal band, and the structural stability and the service life of the soft package battery are influenced.
The invention further increases the surface etching, roughness and surface tension of the adhesive film by adding the plasma surface treatment step to the tab adhesive, can enhance the bonding strength of the tab adhesive and the metal band, and improves the durability of the tab. Compared with the conventional pole lug production process product, the plasma-treated pole lug glue dyne value can be improved by at least 35%, and the adhesive force of the glue and the metal belt can be improved by at least 20%.
Disclosure of Invention
In view of the above, the present invention is directed to a method for preparing a long-durability lithium ion battery polymer tab, so as to solve the technical problem in the prior art that a lithium battery tab has poor durability and stability.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for preparing a long-durability lithium ion battery polymer tab comprises the following steps:
(1) cleaning and deoiling the surface of a metal belt on a machine to remove oil, cleaning and drying, removing a surface oxidation film, cleaning and drying, and passivating the surface;
(2) cutting the tab glue, carrying out plasma treatment on the surface of the cut tab glue, and detecting a dyne value of the treated tab glue, wherein the dyne value meets 45-60 dynes, and if the dyne value does not meet the requirement, carrying out plasma treatment on the surface of the tab glue repeatedly until the tab glue is qualified to obtain a tab glue sheet;
(3) and (3) carrying out on-machine belt leading on the metal belt processed in the step (1), pre-pasting the lug film processed in the step (2), shaping and bubble removing of the lug film, thermal compounding, shaping of the lug film, cutting of the metal belt, angle guiding of the metal belt, inspection and packaging processes, and thus finishing the preparation of the lug.
According to the plasma surface treatment technology, an equipment host generates an alternating current pulse signal, and the pulse signal is transmitted to a high-frequency cabinet through a cable. The high-frequency cabinet boosts and amplifies the signal and sends the signal to the spray head. The high-frequency high voltage forms an alternating electric field in the spray head to ionize the air and form plasma. After the plasma is blown out of the spray head, the surface of the tab glue can be cleaned.
The plasma processing equipment is a plasma surface processor, can be of various types such as a single spray head, a double spray head, a three spray head, a jet collision head or a rotary spray head and is determined according to the size of the processed tab glue. The plasma is sprayed out at low temperature and is shaped like a flame, and the equipment can be used for continuous conveyor belt treatment and intermittent manual treatment.
Preferably, the temperature control range of the plasma treatment is more than 0 ℃ and less than or equal to 100 ℃, the power is 1000-3000W, the treatment speed is more than 0m/min and less than or equal to 60m/min, and the treatment distance is more than 0mm and less than or equal to 25 mm.
Preferably, the gas used for the plasma treatment is nitrogen, and the gas flow rate is greater than 0L/min and less than or equal to 150L/min.
Preferably, the tab glue is a single-layer polypropylene material or a multi-layer polypropylene material, and when the tab glue is the multi-layer polypropylene material, a polyethylene naphthalate layer or a non-woven fabric layer is arranged in two adjacent layers of polypropylene materials.
Preferably, the melting point range of the tab glue is 120-168 ℃, the width is 2-15 mm, and the thickness is 60-200 um.
Preferably, the metal strip is an aluminum strip or a copper nickel plated metal strip.
The sizes of the aluminum and copper nickel plating metal strips are not limited, the materials with the width of 1-80mm and the thickness of 0.08-0.60mm are generally adopted, and the copper nickel plating metal strips are generally coated with 0.8-2.5um nickel plating layers.
The metal belt and the lug glue thermal compounding mode can select copper block lug glue heating, resistance metal belt heating, heat radiation metal belt heating, electromagnetic metal belt heating and the like. The processing temperature and time are not limited by technology, and are determined according to the production efficiency and the performance of the finished product, the heating temperature is generally 100-.
Compared with the prior art, the preparation method of the long-durability lithium ion battery polymer tab has the following advantages:
the plasma treatment of the invention further cleans the pollutants and impurities on the surface of the tab adhesive material; the adhesive surface is etched, so that the surface tension is increased, the bonding strength of the metal belt and the tab adhesive after thermal compounding is further enhanced, and the durability of the tab is improved. Compared with the product of the traditional lug production process, the bonding force of the lug glue subjected to plasma treatment and the metal belt can be averagely improved by at least 20%, the reduction range of the stripping force of the lug glue soaked by the electrolyte for a long time is reduced, the durability is improved, and the requirement of the lithium battery on long-term guarantee period can be met. And the plasma surface related equipment has small occupied area, low cost and simple operation. Compared with the conventional pole lug production process product, the plasma-treated pole lug glue dyne value can be improved by at least 28%, and the adhesive force of the glue and the metal belt can be improved by at least 20%.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to examples.
Example 1
The embodiment provides a preparation method of a long-durability lithium ion battery polymer tab, which comprises the following steps:
(1) the aluminum strip is selected to be 0.4mm in thickness, 60mm in width and A1050-H14 in mark; the copper strip is selected to be 0.2mm in thickness, 60mm in width and C1100-O in trademark, the copper strip is subjected to nickel plating treatment, the four sides of the copper strip are plated by adopting an electroplating process, and the control range of the thickness of a plating layer is 1.0-2.0 microns.
(2) The aluminum strip and the copper nickel-plated metal strip adopt the traditional surface treatment process and are subjected to strip loading, surface cleaning and oil removal, cleaning and drying, surface oxide film removal, cleaning and drying, surface chromic acid passivation and cleaning and drying.
(3) Selecting a tab adhesive with the thickness of 100um and the width of 15mm, three layers of composite polypropylene materials, white, the classical melting point of 135 ℃, 145 ℃ and 165 ℃, carrying out plasma surface treatment on the joint side of the tab adhesive and a metal belt, selecting single-nozzle equipment, cleaning the equipment with the area of 50-70mm, selecting the power of 1200W +/-200W, and using gas CDA/N2The gas flow is 80 +/-10L/min, the processing speed is 1.5m/min, the processing distance is 5-15mm, and the dyne value requirement after the single-side processing of the lug is more than or equal to 48 dyn.
(4) The metal belt is made into a semi-finished product of the lug through the processes of loading the belt on a machine, pre-pasting a lug film after plasma treatment and shaping and exhausting.
(5) The semi-finished product is subjected to a thermal compounding process. The thermal compounding process selects a copper block heating mode, a semi-automatic flat plate hot press, the temperature is controlled to be 170 +/-5 ℃, the time is controlled to be 90 +/-2 s, and the pressure is controlled to be 0.4KPa +/-0.05 KPa. And after compounding, naturally cooling to room temperature, and removing and cutting the redundant tab glue to complete the tab manufacturing.
Example 2
The embodiment provides a preparation method of a long-durability lithium ion battery polymer tab, which comprises the following steps:
(1) the aluminum strip is selected to be 0.4mm in thickness, 60mm in width and A1050-H14 in mark; the copper strip is selected to be 0.2mm in thickness, 60mm in width and C1100-O in trademark, the copper strip is subjected to nickel plating treatment, the four sides of the copper strip are plated by adopting an electroplating process, and the control range of the thickness of a plating layer is 1.0-2.0 microns.
(2) The aluminum strip and the copper nickel-plated metal strip adopt the traditional surface treatment process and are subjected to strip loading, surface cleaning and oil removal, cleaning and drying, surface oxide film removal, cleaning and drying, surface chromic acid passivation and cleaning and drying.
(3) Selecting a tab adhesive with the thickness of 100um and the width of 15mm, three layers of composite polypropylene materials, white, the classical melting point of 135 ℃, 145 ℃ and 165 ℃, carrying out plasma surface treatment on the joint side of the tab adhesive and a metal belt, selecting single-nozzle equipment, cleaning the equipment with the area of 50-70mm, selecting the power of 1200W +/-200W, and using gas CDA/N2The gas flow is 80 +/-10L/min, the processing speed is 1.8m/min, the processing distance is 5-15mm, and the dyne value requirement after the single-side processing of the lug is more than or equal to 48 dyn.
(4) The metal belt is made into a semi-finished product of the lug through the processes of loading the belt on a machine, pre-pasting a lug film after plasma treatment and shaping and exhausting.
(5) The semi-finished product is subjected to a thermal compounding process. The thermal compounding process selects a copper block heating mode, a semi-automatic flat plate hot press, the temperature is controlled to be 170 +/-5 ℃, the time is controlled to be 90 +/-2 s, and the pressure is controlled to be 0.4KPa +/-0.05 KPa. And after compounding, naturally cooling to room temperature, and removing and cutting the redundant tab glue to complete the tab manufacturing.
Comparative example
The same raw materials and processing procedures as those adopted in the embodiments 1 and 2 are adopted, and only the working procedure of the plasma surface treatment of the tab glue is cancelled.
The tab of examples 1 and 2 and the tab of reference example were subjected to the following test items of ① tab dyne value test and ② tab electrolyte peeling resistance test (electrolyte with 1000ppm water added at 85 ℃ C., 1 day, 3 days, 5 days and 7 days of soaking respectively; tab glue and metal strip peeling resistance test respectively).
The detection results are as follows:
table 1: tab glue dyne value detection
| Sample size | Example 1 | Example 2 | Reference ratio |
| Dyne/dyn | 52 | 48 | 32 |
Table 2: detection of electrolyte stripping force of tab
Through carrying out plasma surface treatment on the tab glue, the tab glue dyne value is effectively improved, and the electrolyte stripping resistance of the corresponding tab is also improved. In the practical application process, the plasma surface treatment processing parameters can be optimized according to the production efficiency and the specific product performance requirements, and better product performance and processing efficiency can be achieved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A method for preparing a long-durability lithium ion battery polymer tab is characterized by comprising the following steps: the method comprises the following steps:
(1) cleaning and deoiling the surface of a metal belt on a machine to remove oil, cleaning and drying, removing a surface oxidation film, cleaning and drying, and passivating the surface;
(2) cutting the tab glue, performing plasma treatment on the surface of the cut tab glue, and detecting a dyne value of the treated tab glue, wherein the dyne value meets 45-60 dynes, and if the dyne value does not meet the requirement, repeating the plasma treatment on the surface of the tab glue until the tab glue is qualified to obtain a tab glue sheet;
(3) and (3) carrying out on-machine belt leading on the metal belt processed in the step (1), pre-pasting the lug film processed in the step (2), shaping and bubble removing of the lug film, thermal compounding, shaping of the lug film, cutting of the metal belt, angle guiding of the metal belt, inspection and packaging processes, and thus finishing the preparation of the lug.
2. The method of claim 1, wherein the method comprises the steps of: the temperature control range of the plasma treatment is more than 0 ℃ and less than or equal to 100 ℃, the power is 1000-3000W, the treatment speed is more than 0m/min and less than or equal to 60m/min, and the treatment distance is more than 0mm and less than or equal to 25 mm.
3. The method for preparing the long-durability lithium ion battery polymer tab according to claim 1, wherein the gas used in the plasma treatment is nitrogen, and the gas flow rate is greater than 0L/min and less than or equal to 150L/min.
4. The method of claim 1, wherein the method comprises the steps of: the tab glue is a single-layer polypropylene material or a multi-layer polypropylene material, and when the tab glue is the multi-layer polypropylene material, a polyethylene naphthalate layer or a non-woven fabric layer is arranged in the two adjacent layers of polypropylene materials.
5. The method of claim 4, wherein the method comprises the steps of: the melting point range of the tab glue is 120-168 ℃, the width is 2-15 mm, and the thickness is 60-200 um.
6. The method of claim 1, wherein the method comprises the steps of: the metal belt is an aluminum belt or a copper nickel plating metal belt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010429929.1A CN111446409A (en) | 2020-05-20 | 2020-05-20 | Preparation method of long-durability lithium ion battery polymer tab |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010429929.1A CN111446409A (en) | 2020-05-20 | 2020-05-20 | Preparation method of long-durability lithium ion battery polymer tab |
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| CN111446409A true CN111446409A (en) | 2020-07-24 |
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| CN202010429929.1A Pending CN111446409A (en) | 2020-05-20 | 2020-05-20 | Preparation method of long-durability lithium ion battery polymer tab |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113871806A (en) * | 2021-09-24 | 2021-12-31 | 远景动力技术(江苏)有限公司 | Lithium ion battery tab and preparation method and application thereof |
| CN114597602A (en) * | 2020-12-04 | 2022-06-07 | 比亚迪股份有限公司 | Laminated tab for soft package battery and preparation method thereof |
| WO2023159421A1 (en) * | 2022-02-24 | 2023-08-31 | 京东方科技集团股份有限公司 | Cover plate structure, manufacturing method therefor, display device and wearable display device |
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