CN111613839A - Novel ultrathin battery and preparation process thereof - Google Patents
Novel ultrathin battery and preparation process thereof Download PDFInfo
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- CN111613839A CN111613839A CN202010503080.8A CN202010503080A CN111613839A CN 111613839 A CN111613839 A CN 111613839A CN 202010503080 A CN202010503080 A CN 202010503080A CN 111613839 A CN111613839 A CN 111613839A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000000758 substrate Substances 0.000 claims abstract description 70
- 239000000463 material Substances 0.000 claims abstract description 45
- 239000002245 particle Substances 0.000 claims abstract description 24
- 239000003792 electrolyte Substances 0.000 claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims description 75
- 239000011248 coating agent Substances 0.000 claims description 34
- 238000000576 coating method Methods 0.000 claims description 34
- 238000004804 winding Methods 0.000 claims description 33
- 238000007789 sealing Methods 0.000 claims description 30
- 229910052751 metal Inorganic materials 0.000 claims description 27
- 239000002184 metal Substances 0.000 claims description 27
- 238000005520 cutting process Methods 0.000 claims description 24
- 238000004806 packaging method and process Methods 0.000 claims description 21
- 239000011888 foil Substances 0.000 claims description 18
- 238000005096 rolling process Methods 0.000 claims description 18
- 239000008187 granular material Substances 0.000 claims description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 15
- 238000003466 welding Methods 0.000 claims description 15
- 239000002033 PVDF binder Substances 0.000 claims description 13
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 13
- 238000004026 adhesive bonding Methods 0.000 claims description 12
- 230000015572 biosynthetic process Effects 0.000 claims description 12
- 229910052802 copper Inorganic materials 0.000 claims description 12
- 239000010949 copper Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 9
- 229910052744 lithium Inorganic materials 0.000 claims description 9
- 239000012785 packaging film Substances 0.000 claims description 9
- 229920006280 packaging film Polymers 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 239000007773 negative electrode material Substances 0.000 claims description 5
- 239000007774 positive electrode material Substances 0.000 claims description 5
- 150000002500 ions Chemical class 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- QXZUUHYBWMWJHK-UHFFFAOYSA-N [Co].[Ni] Chemical compound [Co].[Ni] QXZUUHYBWMWJHK-UHFFFAOYSA-N 0.000 claims description 3
- 239000002390 adhesive tape Substances 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000010405 anode material Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000011889 copper foil Substances 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000003487 electrochemical reaction Methods 0.000 claims description 3
- 238000005538 encapsulation Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 claims description 3
- 239000011244 liquid electrolyte Substances 0.000 claims description 3
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 3
- LBSANEJBGMCTBH-UHFFFAOYSA-N manganate Chemical compound [O-][Mn]([O-])(=O)=O LBSANEJBGMCTBH-UHFFFAOYSA-N 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 239000011572 manganese Substances 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 238000004537 pulping Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 239000011863 silicon-based powder Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000009461 vacuum packaging Methods 0.000 claims description 3
- 238000011179 visual inspection Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000011236 particulate material Substances 0.000 claims 5
- 239000002985 plastic film Substances 0.000 abstract 1
- 229920006255 plastic film Polymers 0.000 abstract 1
- 239000013543 active substance Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 239000007784 solid electrolyte Substances 0.000 description 1
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
- 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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to the technical field of ultrathin batteries, in particular to a novel ultrathin battery, which comprises a positive substrate, a negative substrate, a positive particle material, a negative particle material, a diaphragm, a positive lug and a negative lug, wherein the positive particle material and the negative particle material are respectively coated on the positive substrate and the negative substrate, the positive substrate and the negative substrate are separated by the diaphragm, and the positive substrate, the negative substrate, the positive particle material, the negative particle material, the diaphragm, the positive lug and the negative lug are all packaged by an aluminum-plastic film and filled with electrolyte. The invention also provides a preparation process of the novel ultrathin battery, and the preparation process is simplified, simple to process, small in production material consumption, high in yield, low in production cost, high in battery capacity, smooth in appearance, not easy to soften, high in hardness meeting the use requirement of high strength, market prospect and suitable for popularization.
Description
Technical Field
The invention relates to the technical field of ultrathin batteries, in particular to a novel ultrathin battery and a preparation process thereof.
Background
As battery technology continues to develop, more demands are placed on the performance of batteries. Ultra-thinning of batteries is an important development direction of batteries.
At present, the ultra-thin design of the battery has been achieved by those skilled in the art, and various implementation methods have been proposed. However, the prior art for manufacturing ultra-thin batteries has the following defects, such as complicated production process, difficult processing, large material consumption for battery production, high production cost, low battery capacity, insufficient capacity, low appearance flatness, and easy softening and insufficient hardness of the batteries due to thin thickness.
The above technical defects seriously limit the forward development of the ultra-thin battery, and become an obstacle for further popularization and application in the field, so we propose a novel ultra-thin battery and a preparation process thereof to solve the above problems.
Disclosure of Invention
The invention aims to solve the problems that the existing ultrathin battery is complex in production process, difficult to process, large in battery production material consumption, high in production cost, low in battery capacity, insufficient in capacity and low in appearance flatness, and meanwhile, the battery is easy to soften and insufficient in hardness due to thin thickness in the prior art, and provides a novel ultrathin battery and a preparation process thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the design is a novel ultrathin battery, including anodal ear and the negative pole ear of anodal substrate, negative pole substrate, anodal granular material, negative pole granular material, diaphragm, battery, anodal substrate and negative pole granular material coating respectively on anodal substrate and negative pole substrate, use between anodal substrate and the negative pole substrate the diaphragm carries out the separation, anodal ear and negative pole ear weld respectively on anodal substrate, the negative pole substrate, anodal granular material, negative pole granular material, diaphragm, anodal ear and negative pole ear all use the plastic-aluminum membrane packing and fill electrolyte, adopt high temperature pressure to become to activate the plastic.
Preferably, the positive electrode substrate is a 10 μm aluminum foil, the negative electrode substrate is a 6 μm copper foil, the positive electrode particle material/the negative electrode particle material are respectively adhered to the positive electrode substrate/the negative electrode substrate by adhesive to form a positive electrode sheet/a negative electrode sheet, the positive electrode particle material is one or more mixed materials of lithium cobaltate/lithium manganate/nickel cobalt manganese/lithium iron phosphate, the negative electrode particle material is one or more mixed materials of graphite/silicon powder/silicon carbon/lithium titanate, and the coating thicknesses of the positive electrode particle material and the negative electrode particle material are both 5 micrometers to 70 micrometers.
Preferably, the separator is used as a separator between the positive electrode substrate and the negative electrode substrate to prevent the positive electrode active material and the negative electrode active material from contacting each other to generate a short circuit, and when in electrochemical reaction, necessary electrolyte is maintained to form a channel for ion movement, the surface of the separator is coated with a polyvinylidene fluoride layer, and the coating thickness of the polyvinylidene fluoride layer is 9-12 microns.
Preferably, the electrolyte is a liquid electrolyte.
A preparation process of a novel ultrathin battery comprises the following steps:
s1, positive/negative pole pulping:
and (3) preparing a positive electrode material:
preparing a PVDF solution according to the concentration of 5%. NMP is weighed and added into the material jar, PVDF is weighed and added into the material jar in 1-3 times, and the interval of each time is 10 minutes.
2. Vacuumizing, wherein the vacuum degree is-0.08 to-0.10 MPa.
3. Stirring and revolving for 30 minutes, and rotating and revolving for 30 minutes.
4. Adding the anode particle material, stirring, converting for 35 minutes, then converting for 30 minutes, and controlling the slurry temperature to be less than 35 ℃.
And (3) negative electrode material preparation:
preparing CMC solution according to the concentration of 1.6 percent. Weighing deionized water, adding into a material jar, weighing CMC, adding into the material jar for 1-3 times, and each time at an interval of 10 minutes.
2. Vacuumizing, wherein the vacuum degree is-0.08 to-0.10 MPa.
3. Stirring and revolving for 30 minutes, and rotating and revolving for 30 minutes.
4. Adding negative electrode particle materials, stirring, converting for 35 minutes, then converting for 30 minutes, and enabling the slurry temperature to be lower than 35 ℃.
S2, positive/negative electrode coating:
coating the positive electrode:
1. heating the single side of the anode substrate at a first temperature: 100 +/-5 ℃, heating section II temperature: 110 +/-5 ℃, and the temperature of the heating section III: 120 +/-5 ℃, and the temperature of the heating section is four: 120 +/-5 ℃, and the temperature of the heating section five: 150 +/-5 ℃, six temperatures of a heating section: 90 +/-5 ℃.
2. Heating the two sides of the anode substrate at a first temperature: 100 +/-5 ℃, heating section II temperature: 110 +/-5 ℃, and the temperature of the heating section III: 120 +/-5 ℃, and the temperature of the heating section is four: 120 +/-5 ℃, and the temperature of the heating section five: 120 +/-5 ℃, six temperatures of a heating section: 90 +/-5 ℃.
3. And uniformly coating the prepared anode material on the surface of an anode substrate by adopting a coating machine to prepare an anode sheet and a cathode sheet, wherein the air pressure of the coating machine is 0.4-0.6 MPa, the front tension air pressure is 0.08-0.12 MPa, the rear tension air pressure is 0.10-0.14 MPa, and the walking speed is 5.0-6.0 m/min.
Coating of a negative electrode:
1. heating the single side of the cathode substrate at a first temperature: 90 +/-10 ℃, temperature of the heating section II: 110 +/-10 ℃, and the temperature of the heating section III: 120 +/-10 ℃, and the temperature of the heating section IV: 120 +/-10 ℃, fifth temperature of the heating section: 120 +/-10 ℃, six temperatures of a heating section: 90 +/-10 ℃.
2. Heating the two sides of the negative electrode substrate at a first temperature: 90 +/-10 ℃, temperature of the heating section II: 110 +/-10 ℃, and the temperature of the heating section III: 120 +/-10 ℃, and the temperature of the heating section IV: 120 +/-10 ℃, fifth temperature of the heating section: 120 +/-10 ℃, six temperatures of a heating section: 90 plus or minus 10 ℃;
3. and uniformly coating the prepared negative electrode ingredients on the surface of a negative electrode substrate by adopting a coating machine to prepare a negative electrode sheet, wherein the air pressure of the coating machine is 0.4-0.6 MPa, the front tension air pressure is 0.10-0.16 MPa, the rear tension air pressure is 0.12-0.18 MPa, and the walking speed is 4.5-5.5 m/min.
S3, continuous rolling:
and (3) rolling the positive electrode:
1. and (4) mounting the positive plate prepared by whole rolling at the unwinding end, fixing the positive plate by using an air expansion shaft, and drawing the positive plate to the winding end for fixing.
2. The sheet rolling speed is less than or equal to 35HZ, and the working air pressure is controlled to be 0.5-0.7 MPa.
Rolling the negative electrode:
1. and arranging the integrally-rolled negative plate at the unwinding end, fixing the negative plate by using an air expansion shaft, and drawing the negative plate to the winding end for fixing.
2. The sheet rolling speed is less than or equal to 35HZ, and the working air pressure is controlled to be 0.6-0.8 MPa.
S4, cutting pieces:
positive electrode cut pieces:
1. and (4) winding the coil of the positive plate into a feeding shaft, and penetrating the positive plate to a roller.
2. The cut strip size was adjusted to 72mm by 53 mm.
3. Ensure that the cutting belt starts cutting after not deflecting.
4. Checking that the size of the cut small pieces is in an acceptable range.
Negative electrode cutting piece
1. And (4) winding the negative plate into a feeding shaft, and penetrating the negative plate to a roller.
2. The cut strip size was adjusted to 142mm 54 mm.
3, ensuring that the cutting belt does not deflect and then starting cutting.
4. Checking that the size of the cut small pieces is in an acceptable range.
S5, welding a tab:
1. respectively placing positive and negative electrode tabs of 2mm on the top ends of the positive and negative electrode sheets, and reserving metal strips with the length of 11.0 +/-1.0 mm;
2. respectively welding the positive/negative electrode tabs on the positive/negative electrode sheets by using an ultrasonic welding machine under the pressure of 0.3Mpa and rated power;
3. and after the positive/negative electrode lugs are not easy to fall off, the qualified lug pole pieces are transferred to the adhesive tape.
S6, pasting tab glue:
1. gluing the L56mm W5mm Th0.04mm tab to the welding position of the metal strip of the positive electrode tab and the metal foil by using a gluing machine to prevent the metal foil from contacting with other objects to cause short circuit;
2. gluing the L55mm W5mm Th0.04mm tab to the welding position of the metal strip of the cathode tab and the metal foil by using a gluing machine to prevent the metal foil from contacting with other objects to cause short circuit;
3. and checking to ensure that the tab glue completely covers the metal strip and the metal foil area, and then turning to the next procedure for winding.
S7, winding:
1. the cut-to-length diaphragm 56mm by 0.012 μm wide was fixed to a 37.0mm wide roller pin.
2. And inserting the negative pole piece into the diaphragm, ensuring that the diaphragm wraps the pole piece in place, and winding the winding needle for one circle anticlockwise by using a rewinding mode.
3. And inserting the positive plate into the diaphragm, wrapping the pole piece by the diaphragm, and wrapping the positive electrode by the negative electrode to roll anticlockwise, so that the plate is not exposed and does not spiral.
And 4, sticking the ending part with digital adhesive paper to obtain the winding core.
5. And comparing the distance between the lugs by using the clamp, and ensuring that the winding core is switched to the next procedure for winding after meeting the requirement of the client standard distance.
S8, packaging:
1. and (5) putting the roll core into the punched and formed aluminum-plastic packaging film.
2. Carrying out top sealing operation on the aluminum-plastic packaging film by using a top sealing machine, wherein the temperature of an upper copper die is set to be 180 degrees, the temperature of a lower copper die is set to be 250 degrees, and the temperature is tested after the pressure intensity of a cylinder is 0.3 Mpa;
3. carrying out top packaging by using a top sealing machine and then entering into side sealing operation;
4. the side sealing machine is set with the temperature of 180 degrees for the upper and lower copper molds and the air pressure of 0.3 Mpa;
5. packaging the side edge sealing of the packaging film by using a side sealing machine with qualified temperature and air pressure to obtain a packaged battery cell;
6. after confirming that the cell packaging edge sealing is tight and sealed and air cannot flow in, turning to baking;
s9, baking:
1. and putting the battery cell into an oven.
2. Closing the oven, and vacuumizing to vacuum degree: less than or equal to-0.08 MPa.
3. Heating to 85 + -5 deg.C.
4. The baking time was 24 hours.
S10, injection:
1. and (4) putting the baked battery cell into a glove box with the dew point below-36 ℃.
2. And injecting 1.0G electrolyte into the battery cell by using an altitude pump.
3. Putting the battery into a vacuum box for vacuumizing, wherein the vacuum degree is-85 Kpa, and turning to once packaging after the electrolyte is completely infiltrated into the battery core;
4. sealing the battery cell liquid injection port by using a copper mold with the temperature of 180 degrees in a vacuum state by using vacuum packaging equipment;
5. and after the electrolyte is checked and ensured not to overflow, the operation is carried out at high temperature and pressure.
S11, high-temperature pressure forming:
1. adjusting the parameters of the pressure formation cabinet to 80 ℃ in the whole process, and carrying out 3 pressure steps: 0.6kg/c square meter for 10min, then 0.80kg/c square meter for 48min, and finally 1.0kg/c square meter for 20 min;
2, aligning the positive electrode at the top end of the battery cell with a positive electrode current output port, aligning the negative electrode with a negative electrode current output port, and horizontally placing the battery cell on equipment;
3. setting formation steps, wherein parameters of the specific steps are shown in the following table:
4. and opening the equipment for formation, checking the voltage of the battery after the formation is finished, selecting the battery cell with the voltage of more than or equal to 3.4V, and transferring to the next step for air extraction and packaging.
S12, air-extracting and packaging:
1. adjusting the equipment to vacuum degree-80 Mpa and sealing head temperature 180 ℃;
2. after the charged cell airbag is punctured, the airbag is outwards put into equipment for air exhaust and encapsulation;
3. cutting off the encapsulated cell airbag part by using a cutting machine, and reserving a 2mm edge seal to prevent liquid leakage;
s13, capacity grading:
1. setting capacity grading steps, wherein parameters of the specific capacity grading steps are shown in the following table:
2. and aligning the positive pole at the top end of the battery core to the positive pole current output port, aligning the negative pole to the negative pole current output port, and horizontally placing the battery core on equipment to perform charging and discharging separation capacity.
3. Setting the checking standard capacity to be more than 180 mAh;
4. and screening out the cells with qualified voltage by using the capacity standard, and transferring to a rechecking process.
S13, rechecking:
1. visually inspecting the appearance of the divided battery cell, whether gas exists, whether scratches exist or not and whether bulging phenomenon exists or not;
2. measuring the voltage of the battery cell qualified by visual inspection by using a voltage tester to ensure that the voltage is above 3.95V;
3. and transferring the qualified battery cell for the voltage test to a pack for further processing according to the requirements of customers.
The novel ultrathin battery and the preparation process thereof have the beneficial effects that: compared with the prior art, the battery has the advantages of simplified production process, simple processing, small production material consumption, high yield, low production cost, high battery capacity, smooth appearance, difficulty in softening, hardness meeting the use requirement of high strength, market prospect and suitability for popularization.
Detailed Description
The invention is further illustrated by the following examples.
Example 1
The utility model provides a novel ultra-thin battery, including the anodal substrate of battery, the negative pole substrate, anodal granular material, the negative pole granular material, the diaphragm, anodal ear and the negative pole ear of battery, anodal granular material and negative pole granular material coat respectively on anodal substrate and negative pole substrate, use the diaphragm to carry out the separation between anodal substrate and the negative pole substrate, anodal ear and negative pole ear weld respectively at anodal substrate, on the negative pole substrate, anodal substrate, the negative pole substrate, anodal granular material, the negative pole granular material, the diaphragm, anodal ear and negative pole ear all use the plastic-aluminum membrane packing and fill electrolyte, adopt high temperature pressure to become to activate the plastic.
The anode substrate is a 10-micron aluminum foil, the cathode substrate is a 6-micron copper foil, the anode particle material/cathode particle material is respectively adhered to the anode substrate/cathode substrate by adhesive to prepare an anode plate/cathode plate, the anode particle material is one or more mixed materials of lithium cobaltate/lithium manganate/nickel cobalt manganese/lithium iron phosphate, the cathode particle material is one or more mixed materials of graphite/silicon powder/silicon carbon/lithium titanate, and the coating thicknesses of the anode particle material and the cathode particle material are both 5-70 microns.
The diaphragm is used as a separation plate between the anode substrate and the cathode substrate, the anode active substance and the cathode active substance are prevented from being contacted with each other to generate short circuit, necessary electrolyte is kept during electrochemical reaction, a channel for ion movement is formed, the surface of the diaphragm is coated with the polyvinylidene fluoride layer, the coating thickness of the polyvinylidene fluoride layer is 9-12 micrometers, the positive/negative pole piece is in full contact with the diaphragm more tightly due to the arrangement of the polyvinylidene fluoride layer, the ion migration speed is higher, the hardness of the pole piece is higher, the battery is thinner and firmer, the wettability and the liquid retention of the diaphragm and the electrolyte are also increased, the condition that the thin battery is not enough in capacity exertion and easy to deform and soften is fully improved, the common liquid electrolyte is used as the electrolyte, and the difference caused by using a special solid electrolyte for a production process flow is avoided.
A preparation process of a novel ultrathin battery comprises the following steps:
s1, positive/negative pole pulping:
and (3) preparing a positive electrode material:
preparing a PVDF solution according to the concentration of 5%. NMP is weighed and added into the material jar, PVDF is weighed and added into the material jar in 1-3 times, and the interval of each time is 10 minutes.
2. Vacuumizing, wherein the vacuum degree is-0.08 to-0.10 MPa.
3. Stirring and revolving for 30 minutes, and rotating and revolving for 30 minutes.
4. Adding the anode particle material, stirring, converting for 35 minutes, then converting for 30 minutes, and controlling the slurry temperature to be less than 35 ℃.
And (3) negative electrode material preparation:
preparing CMC solution according to the concentration of 1.6 percent. Weighing deionized water, adding into a material jar, weighing CMC, adding into the material jar for 1-3 times, and each time at an interval of 10 minutes.
2. Vacuumizing, wherein the vacuum degree is-0.08 to-0.10 MPa.
3. Stirring and revolving for 30 minutes, and rotating and revolving for 30 minutes.
4. Adding negative electrode particle materials, stirring, converting for 35 minutes, then converting for 30 minutes, and enabling the slurry temperature to be lower than 35 ℃.
S2, positive/negative electrode coating:
coating the positive electrode:
1. heating the single side of the anode substrate at a first temperature: 100 +/-5 ℃, heating section II temperature: 110 +/-5 ℃, and the temperature of the heating section III: 120 +/-5 ℃, and the temperature of the heating section is four: 120 +/-5 ℃, and the temperature of the heating section five: 150 +/-5 ℃, six temperatures of a heating section: 90 +/-5 ℃.
2. Heating the two sides of the anode substrate at a first temperature: 100 +/-5 ℃, heating section II temperature: 110 +/-5 ℃, and the temperature of the heating section III: 120 +/-5 ℃, and the temperature of the heating section is four: 120 +/-5 ℃, and the temperature of the heating section five: 120 +/-5 ℃, six temperatures of a heating section: 90 +/-5 ℃.
3. And uniformly coating the prepared anode material on the surface of an anode substrate by adopting a coating machine to prepare an anode sheet and a cathode sheet, wherein the air pressure of the coating machine is 0.4-0.6 MPa, the front tension air pressure is 0.08-0.12 MPa, the rear tension air pressure is 0.10-0.14 MPa, and the walking speed is 5.0-6.0 m/min.
Coating of a negative electrode:
1. heating the single side of the cathode substrate at a first temperature: 90 +/-10 ℃, temperature of the heating section II: 110 +/-10 ℃, and the temperature of the heating section III: 120 +/-10 ℃, and the temperature of the heating section IV: 120 +/-10 ℃, fifth temperature of the heating section: 120 +/-10 ℃, six temperatures of a heating section: 90 +/-10 ℃.
2. Heating the two sides of the negative electrode substrate at a first temperature: 90 +/-10 ℃, temperature of the heating section II: 110 +/-10 ℃, and the temperature of the heating section III: 120 +/-10 ℃, and the temperature of the heating section IV: 120 +/-10 ℃, fifth temperature of the heating section: 120 +/-10 ℃, six temperatures of a heating section: 90 plus or minus 10 ℃;
3. and uniformly coating the prepared negative electrode ingredients on the surface of a negative electrode substrate by adopting a coating machine to prepare a negative electrode sheet, wherein the air pressure of the coating machine is 0.4-0.6 MPa, the front tension air pressure is 0.10-0.16 MPa, the rear tension air pressure is 0.12-0.18 MPa, and the walking speed is 4.5-5.5 m/min.
S3, continuous rolling:
and (3) rolling the positive electrode:
1. and (4) mounting the positive plate prepared by whole rolling at the unwinding end, fixing the positive plate by using an air expansion shaft, and drawing the positive plate to the winding end for fixing.
2. The sheet rolling speed is less than or equal to 35HZ, and the working air pressure is controlled to be 0.5-0.7 MPa.
Rolling the negative electrode:
1. and arranging the integrally-rolled negative plate at the unwinding end, fixing the negative plate by using an air expansion shaft, and drawing the negative plate to the winding end for fixing.
2. The sheet rolling speed is less than or equal to 35HZ, and the working air pressure is controlled to be 0.6-0.8 MPa.
S4, cutting pieces:
positive electrode cut pieces:
1. and (4) winding the coil of the positive plate into a feeding shaft, and penetrating the positive plate to a roller.
2. The cut strip size was adjusted to 72mm by 53 mm.
3. Ensure that the cutting belt starts cutting after not deflecting.
4. Checking that the size of the cut small pieces is in an acceptable range.
Negative electrode cutting piece
1. And (4) winding the negative plate into a feeding shaft, and penetrating the negative plate to a roller.
2. The cut strip size was adjusted to 142mm 54 mm.
3, ensuring that the cutting belt does not deflect and then starting cutting.
4. Checking that the size of the cut small pieces is in an acceptable range.
S5, welding a tab:
1. respectively placing positive and negative electrode tabs of 2mm on the top ends of the positive and negative electrode sheets, and reserving metal strips with the length of 11.0 +/-1.0 mm;
2. respectively welding the positive/negative electrode tabs on the positive/negative electrode sheets by using an ultrasonic welding machine under the pressure of 0.3Mpa and rated power;
3. and after the positive/negative electrode lugs are not easy to fall off, the qualified lug pole pieces are transferred to the adhesive tape.
S6, pasting tab glue:
1. gluing the L56mm W5mm Th0.04mm tab to the welding position of the metal strip of the positive electrode tab and the metal foil by using a gluing machine to prevent the metal foil from contacting with other objects to cause short circuit;
2. gluing the L55mm W5mm Th0.04mm tab to the welding position of the metal strip of the cathode tab and the metal foil by using a gluing machine to prevent the metal foil from contacting with other objects to cause short circuit;
3. and checking to ensure that the tab glue completely covers the metal strip and the metal foil area, and then turning to the next procedure for winding.
S7, winding:
1. the cut-to-length diaphragm 56mm by 0.012 μm wide was fixed to a 37.0mm wide roller pin.
2. And inserting the negative pole piece into the diaphragm, ensuring that the diaphragm wraps the pole piece in place, and winding the winding needle for one circle anticlockwise by using a rewinding mode.
3. And inserting the positive plate into the diaphragm, wrapping the pole piece by the diaphragm, and wrapping the positive electrode by the negative electrode to roll anticlockwise, so that the plate is not exposed and does not spiral.
And 4, sticking the ending part with digital adhesive paper to obtain the winding core.
5. And comparing the distance between the lugs by using the clamp, and ensuring that the winding core is switched to the next procedure for winding after meeting the requirement of the client standard distance.
S8, packaging:
1. and (5) putting the roll core into the punched and formed aluminum-plastic packaging film.
2. Carrying out top sealing operation on the aluminum-plastic packaging film by using a top sealing machine, wherein the temperature of an upper copper die is set to be 180 degrees, the temperature of a lower copper die is set to be 250 degrees, and the temperature is tested after the pressure intensity of a cylinder is 0.3 Mpa;
3. carrying out top packaging by using a top sealing machine and then entering into side sealing operation;
4. the side sealing machine is set with the temperature of 180 degrees for the upper and lower copper molds and the air pressure of 0.3 Mpa;
5. packaging the side edge sealing of the packaging film by using a side sealing machine with qualified temperature and air pressure to obtain a packaged battery cell;
6. after confirming that the cell packaging edge sealing is tight and sealed and air cannot flow in, turning to baking;
s9, baking:
1. and putting the battery cell into an oven.
2. Closing the oven, and vacuumizing to vacuum degree: less than or equal to-0.08 MPa.
3. Heating to 85 + -5 deg.C.
4. The baking time was 24 hours.
S10, injection:
1. and (4) putting the baked battery cell into a glove box with the dew point below-36 ℃.
2. And injecting 1.0G electrolyte into the battery cell by using an altitude pump.
3. Putting the battery into a vacuum box for vacuumizing, wherein the vacuum degree is-85 Kpa, and turning to once packaging after the electrolyte is completely infiltrated into the battery core;
4. sealing the battery cell liquid injection port by using a copper mold with the temperature of 180 degrees in a vacuum state by using vacuum packaging equipment;
5. and after the electrolyte is checked and ensured not to overflow, the operation is carried out at high temperature and pressure.
S11, high-temperature pressure forming:
1. adjusting the parameters of the pressure formation cabinet to 80 ℃ in the whole process, and carrying out 3 pressure steps: 0.6kg/c square meter for 10min, then 0.80kg/c square meter for 48min, and finally 1.0kg/c square meter for 20 min;
2, aligning the positive electrode at the top end of the battery cell with a positive electrode current output port, aligning the negative electrode with a negative electrode current output port, and horizontally placing the battery cell on equipment;
3. setting formation steps, wherein parameters of the specific steps are shown in the following table:
4. and opening the equipment for formation, checking the voltage of the battery after the formation is finished, selecting the battery cell with the voltage of more than or equal to 3.4V, and transferring to the next step for air extraction and packaging.
S12, air-extracting and packaging:
1. adjusting the equipment to vacuum degree-80 Mpa and sealing head temperature 180 ℃;
2. after the charged cell airbag is punctured, the airbag is outwards put into equipment for air exhaust and encapsulation;
3. cutting off the encapsulated cell airbag part by using a cutting machine, and reserving a 2mm edge seal to prevent liquid leakage;
s13, capacity grading:
1. setting capacity grading steps, wherein parameters of the specific capacity grading steps are shown in the following table:
2. and aligning the positive pole at the top end of the battery core to the positive pole current output port, aligning the negative pole to the negative pole current output port, and horizontally placing the battery core on equipment to perform charging and discharging separation capacity.
3. Setting the checking standard capacity to be more than 180 mAh;
4. and screening out the cells with qualified voltage by using the capacity standard, and transferring to a rechecking process.
S13, rechecking:
1. visually inspecting the appearance of the divided battery cell, whether gas exists, whether scratches exist or not and whether bulging phenomenon exists or not;
2. measuring the voltage of the battery cell qualified by visual inspection by using a voltage tester to ensure that the voltage is above 3.95V;
3. and transferring the qualified battery cell for the voltage test to a pack for further processing according to the requirements of customers.
Compared with the prior art, the battery has the advantages of simplified production process, simple processing, small production material consumption, high yield, low production cost, high battery capacity, smooth appearance, difficulty in softening, hardness meeting the use requirement of high strength, market prospect and suitability for popularization.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (5)
1. The utility model provides a novel ultra-thin battery, includes anodal substrate, negative substrate, anodal granular material, negative pole granular material, diaphragm, the anodal ear and the negative pole ear of battery, its characterized in that, anodal granular material and negative pole granular material coat respectively on anodal substrate and negative substrate, use between anodal substrate and the negative substrate the diaphragm carries out the separation, anodal ear and negative pole ear weld respectively on anodal substrate, the negative substrate, anodal granular material, negative pole granular material, diaphragm, anodal ear and negative pole ear all use the plastic-aluminum membrane packing and fill electrolyte to adopt high temperature pressfitting to become and activate the plastic.
2. The novel ultra-thin battery as claimed in claim 1, wherein the positive substrate is 10 μm aluminum foil, the negative substrate is 6 μm copper foil, the positive/negative particulate materials are respectively adhered to the positive/negative substrates by adhesive to form positive/negative sheets, the positive particulate material is one or more of lithium cobaltate/lithium manganate/nickel cobalt manganese/lithium iron phosphate, the negative particulate material is one or more of graphite/silicon powder/silicon carbon/lithium titanate, and the coating thickness of the positive particulate material and the negative particulate material is 5-70 μm.
3. The novel ultra-thin battery as claimed in claim 1, wherein the separator is used as a separator between the positive electrode substrate and the negative electrode substrate to prevent the positive electrode active material and the negative electrode active material from contacting each other to generate short circuit, and to maintain the necessary electrolyte during electrochemical reaction to form a channel for ion movement, the surface of the separator is coated with a polyvinylidene fluoride layer, and the coating thickness of the polyvinylidene fluoride layer is 9-12 microns.
4. The novel ultra-thin battery as claimed in claim 1, wherein the electrolyte is a liquid electrolyte.
5. The process for preparing a novel ultra-thin battery as claimed in claims 1-4, characterized by comprising the following steps:
s1, positive/negative pole pulping:
and (3) preparing a positive electrode material:
preparing a PVDF solution according to the concentration of 5%. NMP is weighed and added into the material jar, PVDF is weighed and added into the material jar in 1-3 times, and the interval of each time is 10 minutes.
2. Vacuumizing, wherein the vacuum degree is-0.08 to-0.10 MPa.
3. Stirring and revolving for 30 minutes, and rotating and revolving for 30 minutes.
4. Adding the anode particle material, stirring, converting for 35 minutes, then converting for 30 minutes, and controlling the slurry temperature to be less than 35 ℃.
And (3) negative electrode material preparation:
preparing CMC solution according to the concentration of 1.6 percent. Weighing deionized water, adding into a material jar, weighing CMC, adding into the material jar for 1-3 times, and each time at an interval of 10 minutes.
2. Vacuumizing, wherein the vacuum degree is-0.08 to-0.10 MPa.
3. Stirring and revolving for 30 minutes, and rotating and revolving for 30 minutes.
4. Adding negative electrode particle materials, stirring, converting for 35 minutes, then converting for 30 minutes, and enabling the slurry temperature to be lower than 35 ℃.
S2, positive/negative electrode coating:
coating the positive electrode:
1. heating the single side of the anode substrate at a first temperature: 100 +/-5 ℃, heating section II temperature: 110 +/-5 ℃, and the temperature of the heating section III: 120 +/-5 ℃, and the temperature of the heating section is four: 120 +/-5 ℃, and the temperature of the heating section five: 150 +/-5 ℃, six temperatures of a heating section: 90 +/-5 ℃.
2. Heating the two sides of the anode substrate at a first temperature: 100 +/-5 ℃, heating section II temperature: 110 +/-5 ℃, and the temperature of the heating section III: 120 +/-5 ℃, and the temperature of the heating section is four: 120 +/-5 ℃, and the temperature of the heating section five: 120 +/-5 ℃, six temperatures of a heating section: 90 +/-5 ℃.
3. And uniformly coating the prepared anode material on the surface of an anode substrate by adopting a coating machine to prepare an anode sheet and a cathode sheet, wherein the air pressure of the coating machine is 0.4-0.6 MPa, the front tension air pressure is 0.08-0.12 MPa, the rear tension air pressure is 0.10-0.14 MPa, and the walking speed is 5.0-6.0 m/min.
Coating of a negative electrode:
1. heating the single side of the cathode substrate at a first temperature: 90 +/-10 ℃, temperature of the heating section II: 110 +/-10 ℃, and the temperature of the heating section III: 120 +/-10 ℃, and the temperature of the heating section IV: 120 +/-10 ℃, fifth temperature of the heating section: 120 +/-10 ℃, six temperatures of a heating section: 90 +/-10 ℃.
2. Heating the two sides of the negative electrode substrate at a first temperature: 90 +/-10 ℃, temperature of the heating section II: 110 +/-10 ℃, and the temperature of the heating section III: 120 +/-10 ℃, and the temperature of the heating section IV: 120 +/-10 ℃, fifth temperature of the heating section: 120 +/-10 ℃, six temperatures of a heating section: 90 plus or minus 10 ℃;
3. and uniformly coating the prepared negative electrode ingredients on the surface of a negative electrode substrate by adopting a coating machine to prepare a negative electrode sheet, wherein the air pressure of the coating machine is 0.4-0.6 MPa, the front tension air pressure is 0.10-0.16 MPa, the rear tension air pressure is 0.12-0.18 MPa, and the walking speed is 4.5-5.5 m/min.
S3, continuous rolling:
and (3) rolling the positive electrode:
1. and (4) mounting the positive plate prepared by whole rolling at the unwinding end, fixing the positive plate by using an air expansion shaft, and drawing the positive plate to the winding end for fixing.
2. The sheet rolling speed is less than or equal to 35HZ, and the working air pressure is controlled to be 0.5-0.7 MPa.
Rolling the negative electrode:
1. and arranging the integrally-rolled negative plate at the unwinding end, fixing the negative plate by using an air expansion shaft, and drawing the negative plate to the winding end for fixing.
2. The sheet rolling speed is less than or equal to 35HZ, and the working air pressure is controlled to be 0.6-0.8 MPa.
S4, cutting pieces:
positive electrode cut pieces:
1. and (4) winding the coil of the positive plate into a feeding shaft, and penetrating the positive plate to a roller.
2. The cut strip size was adjusted to 72mm by 53 mm.
3. Ensure that the cutting belt starts cutting after not deflecting.
4. Checking that the size of the cut small pieces is in an acceptable range.
Negative electrode cutting piece
1. And (4) winding the negative plate into a feeding shaft, and penetrating the negative plate to a roller.
2. The cut strip size was adjusted to 142mm 54 mm.
3, ensuring that the cutting belt does not deflect and then starting cutting.
4. Checking that the size of the cut small pieces is in an acceptable range.
S5, welding a tab:
1. respectively placing positive and negative electrode tabs of 2mm on the top ends of the positive and negative electrode sheets, and reserving metal strips with the length of 11.0 +/-1.0 mm;
2. respectively welding the positive/negative electrode tabs on the positive/negative electrode sheets by using an ultrasonic welding machine under the pressure of 0.3Mpa and rated power;
3. and after the positive/negative electrode lugs are not easy to fall off, the qualified lug pole pieces are transferred to the adhesive tape.
S6, pasting tab glue:
1. gluing the L56mm W5mm Th0.04mm tab to the welding position of the metal strip of the positive electrode tab and the metal foil by using a gluing machine to prevent the metal foil from contacting with other objects to cause short circuit;
2. gluing the L55mm W5mm Th0.04mm tab to the welding position of the metal strip of the cathode tab and the metal foil by using a gluing machine to prevent the metal foil from contacting with other objects to cause short circuit;
3. and checking to ensure that the tab glue completely covers the metal strip and the metal foil area, and then turning to the next procedure for winding.
S7, winding:
1. the cut-to-length diaphragm 56mm by 0.012 μm wide was fixed to a 37.0mm wide roller pin.
2. And inserting the negative pole piece into the diaphragm, ensuring that the diaphragm wraps the pole piece in place, and winding the winding needle for one circle anticlockwise by using a rewinding mode.
3. And inserting the positive plate into the diaphragm, wrapping the pole piece by the diaphragm, and wrapping the positive electrode by the negative electrode to roll anticlockwise, so that the plate is not exposed and does not spiral.
And 4, sticking the ending part with digital adhesive paper to obtain the winding core.
5. And comparing the distance between the lugs by using the clamp, and ensuring that the winding core is switched to the next procedure for winding after meeting the requirement of the client standard distance.
S8, packaging:
1. and (5) putting the roll core into the punched and formed aluminum-plastic packaging film.
2. Carrying out top sealing operation on the aluminum-plastic packaging film by using a top sealing machine, wherein the temperature of an upper copper die is set to be 180 degrees, the temperature of a lower copper die is set to be 250 degrees, and the temperature is tested after the pressure intensity of a cylinder is 0.3 Mpa;
3. carrying out top packaging by using a top sealing machine and then entering into side sealing operation;
4. the side sealing machine is set with the temperature of 180 degrees for the upper and lower copper molds and the air pressure of 0.3 Mpa;
5. packaging the side edge sealing of the packaging film by using a side sealing machine with qualified temperature and air pressure to obtain a packaged battery cell;
6. after confirming that the cell packaging edge sealing is tight and sealed and air cannot flow in, turning to baking;
s9, baking:
1. and putting the battery cell into an oven.
2. Closing the oven, and vacuumizing to vacuum degree: less than or equal to-0.08 MPa.
3. Heating to 85 + -5 deg.C.
4. The baking time was 24 hours.
S10, injection:
1. and (4) putting the baked battery cell into a glove box with the dew point below-36 ℃.
2. And injecting 1.0G electrolyte into the battery cell by using an altitude pump.
3. Putting the battery into a vacuum box for vacuumizing, wherein the vacuum degree is-85 Kpa, and turning to once packaging after the electrolyte is completely infiltrated into the battery core;
4. sealing the battery cell liquid injection port by using a copper mold with the temperature of 180 degrees in a vacuum state by using vacuum packaging equipment;
5. and after the electrolyte is checked and ensured not to overflow, the operation is carried out at high temperature and pressure.
S11, high-temperature pressure forming:
1. adjusting the parameters of the pressure formation cabinet to 80 ℃ in the whole process, and carrying out 3 pressure steps: 0.6kg/c square meter for 10min, then 0.80kg/c square meter for 48min, and finally 1.0kg/c square meter for 20 min;
2, aligning the positive electrode at the top end of the battery cell with a positive electrode current output port, aligning the negative electrode with a negative electrode current output port, and horizontally placing the battery cell on equipment;
3. setting formation steps, wherein parameters of the specific steps are shown in the following table:
4. and opening the equipment for formation, checking the voltage of the battery after the formation is finished, selecting the battery cell with the voltage of more than or equal to 3.4V, and transferring to the next step for air extraction and packaging.
S12, air-extracting and packaging:
1. adjusting the equipment to vacuum degree-80 Mpa and sealing head temperature 180 ℃;
2. after the charged cell airbag is punctured, the airbag is outwards put into equipment for air exhaust and encapsulation;
3. cutting off the encapsulated cell airbag part by using a cutting machine, and reserving a 2mm edge seal to prevent liquid leakage;
s13, capacity grading:
1. setting capacity grading steps, wherein parameters of the specific capacity grading steps are shown in the following table:
2. and aligning the positive pole at the top end of the battery core to the positive pole current output port, aligning the negative pole to the negative pole current output port, and horizontally placing the battery core on equipment to perform charging and discharging separation capacity.
3. Setting the checking standard capacity to be more than 180 mAh;
4. and screening out the cells with qualified voltage by using the capacity standard, and transferring to a rechecking process.
S13, rechecking:
1. visually inspecting the appearance of the divided battery cell, whether gas exists, whether scratches exist or not and whether bulging phenomenon exists or not;
2. measuring the voltage of the battery cell qualified by visual inspection by using a voltage tester to ensure that the voltage is above 3.95V;
3. and transferring the qualified battery cell for the voltage test to a pack for further processing according to the requirements of customers.
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| CN112186271A (en) * | 2020-09-30 | 2021-01-05 | 惠州市好品盈电子科技有限公司 | Packaging process of polymer flexible package battery cell |
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Application publication date: 20200901 |