CN109888162A - Have gluing structure battery core of embedded tab and preparation method thereof and lithium battery - Google Patents
Have gluing structure battery core of embedded tab and preparation method thereof and lithium battery Download PDFInfo
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- CN109888162A CN109888162A CN201910233777.5A CN201910233777A CN109888162A CN 109888162 A CN109888162 A CN 109888162A CN 201910233777 A CN201910233777 A CN 201910233777A CN 109888162 A CN109888162 A CN 109888162A
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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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- 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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Abstract
The invention discloses a kind of gluing structure battery core for having embedded tab and preparation method thereof and lithium batteries, belong to technical field of lithium batteries.The battery core includes anode pole piece, cathode pole piece and the isolation film between anode pole piece and cathode pole piece, it further include the negative lug on the positive pole ear and each cathode pole piece on each anode pole piece, the distal edge edge of positive pole ear, the distal edge edge of negative lug are maintained at same level with pole piece distal edge edge；A tab connects the first nickel sheet in positive pole ear, and a tab connects the second nickel sheet in negative lug, and the first nickel sheet and the second nickel sheet stretch out pole piece edge for drawing tab.The battery core can not only effectively improve the mass energy density of battery, and can also effectively avoid positive/negative plate that dislocation occurs, loosens, and enhance and contact between pole piece, be conducive to the stability and safety that improve battery.
Description
Technical field
The present invention relates to a kind of lamination type electric cores, belong to technical field of lithium batteries, have more particularly to one kind embedded
Gluing structure battery core of tab and preparation method thereof and lithium battery.
Background technique
Lithium ion battery has the characteristics that energy density is high, average open-circuit voltage is high and has extended cycle life, and has been widely used
In mobile power source, portable electronics and new-energy automobile field.Lithium ion battery is mainly by positive electrode, negative electrode material, electricity
It solves liquid, diaphragm and other auxiliary materials to constitute, the specific capacity of positive and negative electrode material directly determines the energy density of battery.
Existing lithium ion battery is made by positive and negative anodes pole piece and membrane winding or stack mostly, anode pole piece and negative
It is separated with insulation diaphragm or insulation rubberised layer between the pole piece of pole, is coated with active material layer on pole piece, is welded with tab.Takeup type electricity
Due to structure, the mass energy density of battery is relatively low in pond, and laminated battery plate easily occurs due to pole piece heap poststack
Dislocation, stability is poor, often results in short circuit, to cause more serious accident, limits mentioning for the power of battery to a certain extent
It is high.It is therefore desirable to provide a kind of energy density it is high and be avoided that electrode slice loosen, dislocation, stability and peace can be improved
The lithium ion laminated battery of full property.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of gluing structure battery cores and its system for having embedded tab
Preparation Method and lithium battery, which can not only effectively improve the mass energy density of lithium battery, and can also effectively avoid positive and negative
Pole piece occurs dislocation, loosens, and enhances and contacts between pole piece, is conducive to the stability and safety that improve lithium battery.
To achieve the above object, the invention discloses a kind of gluing structure battery cores for having embedded tab, it includes just
Pole pole piece, cathode pole piece and the isolation film between the anode pole piece and cathode pole piece, further include be located at it is each it is described just
The negative lug on positive pole ear and each cathode pole piece on the pole piece of pole, the distal edge edge of the positive pole ear, negative lug
Distal edge along with pole piece distal edge along being maintained at same level；A tab connects the first nickel in the positive pole ear
Piece, a tab connects the second nickel sheet in the negative lug, and first nickel sheet and the second nickel sheet stretch out pole piece distal edge edge
And extend outwardly, for drawing tab.Positive pole ear and negative lug are arranged inside pole piece the present invention, by nickel sheet by pole
Ear draws conduction, and compared with the tab of prior art reach, under the premise of having identical appearance size, the present invention has interior
The battery core of embedded tab possesses bigger mass energy density, is conducive to the power for improving lithium battery.
Preferably, first nickel sheet and the second nickel sheet pass through metallic conduction gluing knot tab.
Preferably, the metallic conduction glue is the mixture of epoxy resin and a small amount of metallic nickel, which is hanging down
Straight film direction is conductive, but but has electrical insulating property in film direction, and normal temperature state does not have stickiness, is heated to 90 DEG C
There can be stickiness, the bonding mode of tab welding mode compared to the prior art, the application will not generate metallic dust, favorably
In reducing lithium battery self-discharge rate, increase the cycle-index of lithium battery, promotes the consistency of lithium battery performance, reduce lithium battery
Security risk.
Further, the battery core further includes the rubberised layer along the setting of positive and negative anodes ear length direction two sides.
Further, the length of the rubberised layer, thickness are identical as battery core respectively, and the width of the rubberised layer is 0.5~
1mm。
Further, the material of the rubberised layer is acrylate, the material have it is excellent it is anti-oxidant, electrolyte resistance is rotten
The performance of erosion, superior high temperature performance, environmental protection, low stress, anti-seismic performance is good, low compression set, and excellent is resistance to
Hou Xing, low surface tension, excellent wet performance is environmental-friendly, nonflammable, and almost non-nuisance is released.
The rubberised layer realizes the positioning of anode pole piece, isolation film and cathode pole piece, can be effectively improved battery pole piece dislocation
Loosening problem increases lithium battery hardness, improves the vibration resistance of lithium battery, reduces short circuit probability, further improves lithium electricity
The safety and reliability in pond.
Further, it is additionally provided on each anode pole piece with positive pole ear and the first notch of column distribution, described the
One notch and negative lug have same shape.Empty avoiding area of first notch as negative lug, can effectively prevent cathode
Tab is contacted with positive plate, solves the problems, such as battery short circuit.
Further, it is additionally provided on each cathode pole piece with negative lug and the second notch of column distribution, described the
Two notches are identical as the shape of positive pole ear.Empty avoiding area of second notch as positive pole ear, can effectively prevent positive pole
Ear is contacted with negative electrode tab, solves the problems, such as battery short circuit.
Preferably, the anode pole piece and the first notch are rectangular.
Preferably, the cathode pole piece is rectangular with the second notch.
In order to preferably realize technical purpose of the invention, the invention also discloses the above-mentioned gluings for having embedded tab
The preparation method of structure battery core, it includes the following steps:
1) metal foil surface coats: metal foil surface coat pole piece slurry and reserved white space as positive pole ear or
Negative lug；This application is almost full page coating to collector, and the mode that intermediate only reserved tab is not coated with is conducive to subtract
The waste of few raw material, reduces production cost；
2) it prepares positive and negative anodes pole piece: roll-in, cutting being carried out to metal foil after coating, obtain anode pole piece or cathode pole piece, with
The same end of positive pole ear or negative lug position is additionally provided with notch for the empty avoiding as positive pole ear or negative lug
Area；A tab in the positive pole ear and negative lug is separately connected nickel sheet for drawing tab；
3) pole piece laminating: the anode pole piece, isolation film and cathode pole piece for treating stacking carry out positioning of taking pictures, according to isolation film
→ cathode pole piece → isolation film → anode pole piece sequence stacks；
4) side gluing: to above-mentioned steps 3) pole piece folded of gained heap carries out hot pressing, then along the two of tab width direction
Side coating glue is fixed, and battery core is made.
Further, the positive pole ear or/and negative lug account for the 2%~6% of pole-piece area.
Preferably, in step 2), the metal that 2um~10um thickness is coated on a tab two sides in the positive pole ear is led
Electric glue connects nickel sheet.
Preferably, in step 2), the metal that 2um~10um thickness is coated on a tab two sides in the negative lug is led
Electric glue connects nickel sheet.
Preferably, in step 3), positioning of taking pictures is carried out using CCD vision system.
Further, in step 4), the length of the glue coating, thickness are identical as battery core respectively, coating width 0.5
~1mm.
At the same time, the invention also discloses a kind of lithium batteries, it includes being made using the assembling of above-mentioned battery core.
The battery core after hot pressing is particularly subjected to packet mylar film, tab welding, set aluminum hull, baking, fluid injection, chemical conversion etc.
Ternary lithium battery is made in process；Wherein, mylar film is wheat membrane.
The beneficial effects are mainly reflected as follows following aspects:
1, the battery that the present invention designs is drawn by a piece of nickel sheet positive and negative respectively using embedded tab design method
Pole tab, in battery form factor situation of a size, compared with the tab of reach, the quality of embedded tab battery core
Energy density is bigger；Be conducive to improve the overall power of battery；
2, the battery that the present invention designs is fixed using rubberised layer coating in the two sides of battery core, effectively prevents electrode plates
The case where loosening, misplacing is conducive to the hardness for improving battery and whole vibration resistance；
3, the present invention, by being pre-positioned in advance to positive and negative anodes pole piece with isolation film, guarantees in preparation cell process
Degree of registration when pole piece stacks, effectively reduces battery short circuit risk, improves the safety and reliability of battery；
4, the present invention is in preparation cell process, by carrying out full page coating, the ground of intermediate only reserved tab to collector
Side is not coated with, and is improved the utilization rate of collector, is reduced the waste of raw material, reduce production cost；
5, tab is glued using conducting resinl in preparation cell process and sticks and stretch out nickel sheet by the present invention, compares existing weldering
Fixed mode is connect, metallic dust will not be generated, reduce battery self discharge rate, the cycle-index of battery is increased, improves
The consistency of battery performance reduces the security risk of battery.
Detailed description of the invention
Fig. 1 is collector applying structure schematic diagram；
Fig. 2 is positive pole piece structure schematic diagram；
Fig. 3 is cathode pole piece structure schematic diagram；
The tab that Fig. 4 is Fig. 2 applies structural schematic diagram after coated with metal conductive glue；
The tab that Fig. 5 is Fig. 3 applies structural schematic diagram after coated with metal conductive glue；
The tab that Fig. 6 is Fig. 4 draws structural schematic diagram after nickel sheet；
The tab that Fig. 7 is Fig. 5 draws structural schematic diagram after nickel sheet；
Fig. 8 is pole piece heap poststack structural schematic diagram of the present invention；
Fig. 9 is the cross-sectional view of laminated cell through-thickness of the present invention；
Figure 10 is that takeup type battery core is made in the embodiment of the present invention two；
Figure 11 is the laminated cell that Z-shaped isolation film is made in the embodiment of the present invention three；
Figure 12 is the test chart that the embodiment of the present invention is made that lithium battery carries out charge-discharge test；
Figure 13 is the test chart that the embodiment of the present invention one is made that lithium battery carries out vibration-testing；
Figure 14 is the test chart that the embodiment of the present invention two is made that lithium battery carries out vibration-testing；
Figure 15 is the test chart that the embodiment of the present invention three is made that lithium battery carries out vibration-testing；
Wherein, each part numbers are as follows in above-mentioned attached drawing:
Anode pole piece 1 (wherein: positive pole ear 1.1, the first notch 1.2, the first nickel sheet 1.3), cathode pole piece 2 are (wherein: negative
Pole tab 2.1, the second notch 2.2, the second nickel sheet 2.3), isolation film 3, rubberised layer 4, metallic conduction glue 5.
Specific embodiment
In order to better explain the present invention, below in conjunction with the specific embodiment main contents that the present invention is furture elucidated, but
The contents of the present invention are not limited solely to following embodiment.
The invention discloses a kind of preparation methods of gluing structure battery core for having embedded tab, it includes following preparation
Step:
1) metal foil surface coats: coating in metal foil surface and reserves white space as positive pole ear 1.1 or cathode
Tab 2.1；Specific coating method is as shown in Figure 1, white space uncoated in figure is used as positive pole ear 1.1 or negative lug
2.1 use, and this application is almost full page coating to collector, and the mode that intermediate only reserved tab is not coated with advantageously reduces
The waste of raw material reduces production cost；Meanwhile being different from the prior art stretching out positive pole ear or negative lug outside pole piece
The mode in portion, the application select this embedded mode to be arranged, and advantageously ensure that the mass energy density of battery core is bigger.
2) it prepares positive and negative anodes pole piece: the works such as roll-in, pre- cutting, cross cutting cutting, laser cutting is carried out to metal foil after coating
The anode pole piece 1 or cathode pole piece 2 of predefined size is made, wherein tab accounts for the 2~6% of pole-piece area in skill；With positive pole ear
1.1 or the same end of 2.1 position of negative lug be additionally provided with notch for as positive pole ear 1.1 or negative lug 2.1
Empty avoiding area；As shown in Figures 2 and 3, empty avoiding area of first notch 1.2 as negative lug 2.1 on anode pole piece 1, cathode pole
Empty avoiding area of second notch 2.2 as positive pole ear 1.1 on piece 2, can effectively prevent tab and contacts with pole piece, and it is short to solve battery
Road problem.
As shown in Figure 4 and Figure 5,2um~10um thickness is coated in the tow sides of positive pole ear 1.1 and negative lug 2.1
Metallic conduction glue 5；A tab in the positive pole ear 1.1 and negative lug 2.1 is separately connected nickel sheet for extraction pole
Ear；Fig. 6 and the first nickel sheet 1.3 shown in Fig. 7 and the second nickel sheet 2.3 are obtained, that is, guarantees that the positive and negative tab of each laminated cell is each
A piece of nickel sheet is drawn to complete conduction, the present invention, which is glued tab using metallic conduction glue, to be sticked, compared to the mode being welded and fixed, no
Metallic dust can be generated, reduces battery self discharge rate, increases the cycle-index of battery, promote the consistency of battery performance, is reduced
The security risk of battery；
3) pole piece laminating: first anode pole piece 1, cathode pole piece 2 and isolation film 3 are cut as predefined size, treat stacking
Anode pole piece 1, isolation film 3 and cathode pole piece 2 carry out positioning of taking pictures, according to 3 → cathode pole piece of isolation film, 2 → isolation film 3 → just
The sequence of pole pole piece 1 stacks；Carry out positioning of taking pictures present invention preferably employs CCD vision system, and preferably using manipulator according to
Said sequence carries out lamination, obtains lamination schematic diagram shown in Fig. 8；When this mode positioned in advance guarantees that pole piece stacks
Degree of registration, reduce battery short circuit risk, improve the safety and reliability of battery；
4) side gluing: to above-mentioned steps 3) pole piece folded of gained heap carries out hot pressing and obtains hot pressing battery core, make anode pole piece
1, cathode pole piece 2 and isolation film 3 are in close contact, then along the two sides coating glue of hot pressing cell polar ear width direction, obtain Fig. 8 institute
The rubberised layer 4 stated, the coated length of the rubberised layer 4, thickness are identical as battery core respectively, and coating width is 0.5~1mm.Pass through
The setting of two sides rubberised layer 4 ensure that the stabilization of entire battery core, can improve battery pole piece dislocation loosening problem, it is hard to increase battery
Degree improves the vibration resistance of battery, reduces short circuit probability, improves battery security and reliability.
5) hot pressing tab: hot pressing is carried out to positive pole ear 1 and negative lug 2 using hot press, metallic conduction glue 5 is heated to be produced
Raw stickiness, Multilayer pole ear is glued and is sticked, and metallic conduction glue 5 solidifies after cooling, no longer has viscous stickiness；
Fig. 9 illustrates the positional relationship between rubberised layer 4 and pole piece of the present invention, effectively prevents electrode plates and loosens, is wrong
The case where position, occurs.
The invention also discloses the assembling process of entire battery, and battery core obtained above is particularly carried out packet mylar
Ternary lithium battery is made in the processes such as film, tab welding, set aluminum hull, baking, fluid injection, chemical conversion；
Embodiment one
Laminated batteries are made according to above-mentioned preparation method, wherein the size of anode pole piece 1 and cathode pole piece 2 is long × wide
The size of=180mm × 169mm, positive pole ear 1.1 and negative lug 2.1 is length × wide=40mm × 25mm, the material of rubberised layer
Matter is acrylate, and the material of metallic conduction glue is the mixture of epoxy resin and metallic nickel.
Embodiment two
The material and pole piece size, polar ear size of the present embodiment selection are identical with documents 1, but what is prepared is volume
Wound lithium-ion electric core, as shown in Figure 10, using hot pressing battery core, tab welding, packet mylar film, battery core enter shell, cap seals
Takeup type ternary lithium battery is made in the processes such as weldering, baking, fluid injection, chemical conversion,
Embodiment three
The present embodiment selection material and pole piece size, polar ear size it is identical with documents 1, but using it is Z-shaped every
Lamination process from film prepares lithium-ion electric core, as shown in figure 11, by after cutting anode pole piece and cathode pole piece be sequentially inserted into Z
In the isolation film that shape folds, so that Z-shaped isolation film laminated Li-ion battery core is obtained, using hot pressing battery core, tab welding, packet
Mylar film, battery core enter the processes such as shell, cap sealing welding, baking, fluid injection, chemical conversion, and Z-shaped isolation film laminated Li-ion electricity is made
Pond.
Test result:
(1) charge-discharge test:
30 ternary lamination lithium batteries made from embodiment 1 are subjected to the test of 1C constant current charge-discharge, charging/discharging voltage model
Enclose 2.75~4.2V；
30 ternary coiling type lithium batteries made from embodiment 2 are subjected to the test of 1C constant current charge-discharge, charging/discharging voltage
2.75~4.2V of range；
The stacked ternary lithium battery of Z-shaped isolation film made from embodiment 3 is subjected to the test of 1C constant current charge-discharge, charge and discharge
2.75~4.2V of voltage range；Obtain battery quality energy density table shown in Figure 12, as shown in Figure 12, lithium produced by the present invention
Battery energy density is highest, reachable 218wh/kg~223wh/kg, much higher than the coiled battery of embodiment two.
(2) vibration-testing:
30 ternary lamination lithium batteries made from embodiment 1 are carried out to the vibration-testing in tri- directions X, Y, Z, each direction
On from 10Hz~55Hz with 7g acceleration circulation frequency sweep vibrate 2h, sweep rate 12min/sweep.Test result such as Figure 13 institute
Show.
30 ternary coiling type lithium batteries made from embodiment 2 are carried out to the vibration-testing in tri- directions X, Y, Z, Mei Gefang
2h, sweep rate 12min/sweep are vibrated from 10Hz~55Hz with 7g acceleration circulation frequency sweep upwards.Test result such as Figure 14
It is shown.
The stacked ternary lithium battery of Z-shaped isolation film made from embodiment 3 is carried out to the vibration-testing in tri- directions X, Y, Z,
2h, sweep rate 12min/sweep are vibrated from 10Hz~55Hz with 7g acceleration circulation frequency sweep in each direction.Test result
As shown in figure 15.
In conjunction with Figure 13,14 and 15 it is found that stability test prepared by the present invention is best.
By the above-mentioned battery dismantling after vibration-testing, internal state is observed, table 1 is obtained:
1 test result list of table
By attached drawing 13,14,15 and table 1 it is found that lithium battery quality energy density prepared by the present invention is high, and it is safe steady
Qualitative height.
Above embodiments are only best citing, rather than a limitation of the embodiments of the present invention.Except above-described embodiment
Outside, there are also other embodiments by the present invention.All technical solutions formed using equivalent substitution or equivalent transformation, all fall within the present invention
It is required that protection scope.
Claims (10)
1. a kind of gluing structure battery core for having embedded tab, it includes anode pole piece (1), cathode pole piece (2) and is located at institute
State the isolation film (3) between anode pole piece (1) and cathode pole piece (2), it is characterised in that: further include being located at each positive pole
The negative lug (2.1) on positive pole ear (1.1) and each cathode pole piece (2) on piece (1), the positive pole ear (1.1)
Distal edge along, negative lug (2.1) distal edge along with pole piece distal edge along keeping same plane；The positive pole ear
(1.1) tab connects the first nickel sheet (1.3) in, and a tab connects the second nickel sheet in the negative lug (2.1)
(2.3), first nickel sheet (1.3) and the second nickel sheet (2.3) stretch out pole piece distal edge edge and extend outwardly.
2. having the gluing structure battery core of embedded tab according to claim 1, it is characterised in that: the battery core further includes
The rubberised layer (4) being arranged along the two sides of positive and negative anodes ear length direction.
3. having the gluing structure battery core of embedded tab according to claim 2, it is characterised in that: the rubberised layer (4)
Length, thickness it is identical as battery core respectively, the width of the rubberised layer (4) is 0.5~1mm.
4. having the gluing structure battery core of embedded tab according to Claims 2 or 3, it is characterised in that: the rubberised layer
(4) material is acrylate.
5. having the gluing structure battery core of embedded tab described according to claim 1 or 2 or 3, it is characterised in that: each described
Be additionally provided on anode pole piece (1) with first notch (1.2) of positive pole ear (1.1) laid out in parallel, first notch (1.2) with
Negative lug (2.1) has same shape.
6. having the gluing structure battery core of embedded tab described according to claim 1 or 2 or 3, it is characterised in that: each described
Be additionally provided on cathode pole piece (2) with second notch (2.2) of negative lug (2.1) laid out in parallel, second notch (2.2) with
The shape of positive pole ear (1.1) is identical.
7. having the preparation method of the gluing structure battery core of embedded tab described in a kind of claim 1, it includes the following steps:
1) metal foil surface coats: coating pole piece slurry and reserved white space as positive pole ear or cathode in metal foil surface
Tab；
2) it prepares positive and negative anodes pole piece: roll-in, cutting being carried out to metal foil after coating, anode pole piece or cathode pole piece are obtained, with anode
The same end of tab or negative lug position is additionally provided with notch for the empty avoiding area as negative lug or negative positive pole ear；
A tab in the positive pole ear and negative lug is separately connected nickel sheet for drawing tab；
3) pole piece laminating: the anode pole piece, isolation film and cathode pole piece for treating stacking carry out positioning of taking pictures, according to isolation film → negative
Pole pole piece → isolation film → anode pole piece sequence stacks；
4) side gluing: to above-mentioned steps 3) pole piece folded of gained heap carries out hot pressing, then applies along the two sides of tab width direction
It covers glue to be fixed, battery core is made.
8. having the preparation method of the gluing structure battery core of embedded tab according to claim 7, it is characterised in that: described
Positive pole ear or/and negative lug account for the 2%~6% of pole-piece area.
9. having the preparation method of the gluing structure battery core of embedded tab according to claim 7 or 8, it is characterised in that:
In step 4), the length of the glue coating, thickness are identical as battery core respectively, and coating width is 0.5~1mm.
10. a kind of lithium battery, it includes being made using battery core described in claim 1 assembling.
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Cited By (4)
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| CN111710925A (en) * | 2020-06-10 | 2020-09-25 | 包头昊明稀土新电源科技有限公司 | Preparation method of water-based battery cell |
| CN113540405A (en) * | 2021-05-26 | 2021-10-22 | 惠州锂威新能源科技有限公司 | Manufacturing process of multi-tab pole piece, multi-tab pole piece and secondary battery |
| CN114094164A (en) * | 2021-11-08 | 2022-02-25 | 惠州锂威新能源科技有限公司 | Multi-tab battery cell manufacturing process and multi-tab battery cell |
| CN114914552A (en) * | 2021-02-08 | 2022-08-16 | 华为技术有限公司 | Battery cell, battery and electronic equipment |
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| CN108376759A (en) * | 2018-01-17 | 2018-08-07 | 柔电（武汉）科技有限公司 | A kind of soft package lithium battery preparation method improving energy density |
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| CN109449474A (en) * | 2018-09-19 | 2019-03-08 | 多氟多（焦作）新能源科技有限公司 | A kind of preparation method of soft-package battery |
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| CN111710925B (en) * | 2020-06-10 | 2022-08-30 | 包头昊明稀土新电源科技有限公司 | Preparation method of water-based battery cell |
| CN114914552A (en) * | 2021-02-08 | 2022-08-16 | 华为技术有限公司 | Battery cell, battery and electronic equipment |
| CN113540405A (en) * | 2021-05-26 | 2021-10-22 | 惠州锂威新能源科技有限公司 | Manufacturing process of multi-tab pole piece, multi-tab pole piece and secondary battery |
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