CN204885328U - Square lithium ion battery electric core of convoluteing - Google Patents
Square lithium ion battery electric core of convoluteing Download PDFInfo
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- CN204885328U CN204885328U CN201520484647.6U CN201520484647U CN204885328U CN 204885328 U CN204885328 U CN 204885328U CN 201520484647 U CN201520484647 U CN 201520484647U CN 204885328 U CN204885328 U CN 204885328U
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- lithium ion
- battery core
- pole piece
- ion battery
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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
Abstract
The utility model provides a square lithium ion battery electric core of convoluteing, including positive plate, diaphragm and negative pole piece, the positive plate is equipped with anodal utmost point ear, the negative pole piece is equipped with negative pole utmost point ear, the center that electric core was convoluteed to the square is equipped with inside support frame. Adopting this utility model's technical scheme, having improved traditional square problem that the material easily drops on the crooked semicircle - shaped position of the easy deformations problems of the pole piece of electric core in charge -discharge cycle and pole piece of convoluteing, furthest has kept the uniformity of square lithium ion battery under static state and charge -discharge cycle developments, has improved the production qualification rate of the electric core of convoluteing and square lithium ion battery's security, uses reliably for the electric core of square coiling and has created the condition in the power battery field.
Description
Technical field
The utility model belongs to technical field of lithium ion, relates to a kind of lithium ion battery winding battery core, particularly relates to a kind of square lithium ion battery winding battery core.
Background technology
Lithium ion battery has the advantages such as energy is high, volume is little, pollution-free, is the clean energy resource that country greatly develops.Square lithium ion battery is widely used in electrokinetic cell due to advantages such as capacity are large, easy to use.Electrokinetic cell is the battery string used with cascade, for ensureing the practicality, fail safe etc. of electrokinetic cell, consistency between the monomer battery core use series connection proposes requirements at the higher level, not only require the consistency of static capacity, voltage, and require the step-up ratio in charge and discharge process, the step-down rate moment is consistent.
In the production process of lithium ion battery, most critical be exactly the production link of lithium ion battery cell, the quality of battery core directly affects the fail safe of lithium ion battery, consistency and useful life.At present, Large Copacity square lithium ion battery battery core adopt manufacture method have takeup type, stacked two kinds.Laminated batteries has better cycle characteristics, security feature and energy density, but production process is loaded down with trivial details, and during production in enormous quantities, quality control difficulty realizes.Winding battery core production technology is ripe, large-scale production process easily controls, but winding battery core exists many places bending and varied in thickness region, and low-angle especially in the middle part of core bends region and collector welding region, due to the shrink tension that pole piece in charge and discharge process, barrier film are different, and cause pole piece to crumple distortion, both positive and negative polarity can not effectively contact, and causes reaction dead zone, and the energy content of battery declines, Li dendrite generation internal short-circuit can be produced time serious, threaten the fail safe that battery uses.And in winding process, along with the continuous increase of core external diameter, volume pin is wound extruding, pulls out pin difficulty, even take internal layer barrier film out of after causing winding to complete, and destroys the degree of registration of core, so that affects the production qualification rate of battery core.
Patent CN200510109540.4 by using positive pole inner ring, negative pole outer ring on gap design and this position not to be coated with active material on the bending semi-circular shape position of square battery core pole piece, solve the problem of square battery core circulation time electrolyte skewness and pole piece easy dry linting in knee, although this scheme solves the dusting problems of pole piece half-circle area under the prerequisite reducing the energy content of battery, improvement be there is no to the pole piece distortion that the dilation in the non-semicircle district of pole piece brings.By being designed on battery core actuated position by the winding clearing end of positive and negative plate in patent CN200820138752.4, reduce pole piece buckling problems.But in practical operation, the pole piece convergent-divergent heterogeneity degree of circular arc sector is more serious, can aggravate the looseness of pole piece laminating in arcuate segments ending.Square winding battery core easily causes pole piece to crumple distortion in charge and discharge process, and then there is the potential safety hazard of internal short-circuit, has received the concern of more multi-specialized personage.
Utility model content
For above-mentioned technical problem, the utility model provides a kind of square lithium ion battery winding battery core, solve the square winding battery core pole piece of existing explained hereafter, the problem of in use easily crumple distortion and the easy dry linting in pole piece knee, and avoid the problem on deformation of pole piece.
To this, the technical solution adopted in the utility model is:
A kind of square lithium ion battery winding battery core, comprise positive plate, barrier film, negative plate, described positive plate is provided with positive pole ear, and described negative plate is provided with negative lug, and the center of described square winding battery core is provided with interior shelf.
Described interior shelf is the center of square winding battery core, plays and supports the effect that positive plate, barrier film and the negative plate be wound on together becomes a solid shape.
As further improvement of the utility model, described interior shelf is the one in insulation roll pin or hollow sting.
As further improvement of the utility model, described interior shelf is insulation roll pin, and the thickness of described insulation roll pin is 5 ~ 10mm.Adopt this technical scheme, can according to the insulation roll pin of the suitable size of the size Selection of lithium ion battery, positive plate, barrier film, negative plate and barrier film are arranged in sandwich formats in order, be wound on described insulation roll pin by guide roller, together with in the described insulation roll pin side of putting into shell after having reeled, then carry out encapsulating, fluid injection, change into, partial volume.Described insulation roll pin is preferably entity insulation roll pin.
The width of described insulation roll pin is not more than the width of described square winding battery core.Further preferred, the reel width of battery core of width and the square of described interior shelf is identical.
As further improvement of the utility model, the cross section of the outer surface of described insulation roll pin two side is semicircular arc.Preferably, the cross section of described insulation roll pin outer surface is circular arc.Adopt this technical scheme, the edge that described insulation roll pin contacts with core is arc-shaped, better to disperse the stress between core pole piece and volume pin, better solves pole piece problem on deformation in use, and the problem of the easy dry linting of pole piece crooked position.
As further improvement of the utility model, the material of described insulation roll pin be in PTFE, PP, PE, PFA, PPO, PSF, PSU, PES or PASF any one.
As further improvement of the utility model, described interior shelf is hollow sting, and described hollow sting is the bonding formation of pole piece coiling; Wherein, described pole piece is that positive plate is or/and negative plate.
As further improvement of the utility model, described pole piece coiling bonding site is material blank district.Can first according to lithium ion battery size design pole piece material clear area, positive plate containing designing material clear area, barrier film, negative plate containing designing material clear area are arranged in sandwich formats in order, be wound on pin by guide roller, at pole piece material clear area gluing, pole piece and barrier film are bonded together mutually in winding process, extract after completing in the volume pin side of putting into shell, then carry out encapsulating, fluid injection, to change into and partial volume.Described material blank district is the region not applying negative or positive electrode active material.
Preferred further, design pole piece material clear area is the pole piece crooked position of winding battery core, the gluing mode adopted in winding process is the whole bending semi arch gluing of pole piece, make between each pole piece of bending semi arch, to be bonded as one, core inside forms hollow sting, thus the STRESS VARIATION between dispersion core pole piece in charge and discharge process, solve pole piece problem on deformation in use, and the problem of easy dry linting.
As further improvement of the utility model, described positive pole ear and negative lug are positioned at the homonymy of described interior shelf.Adopt this technical scheme, there is unified pole piece convergent-divergent trend, reduce the pole piece distortion that lug place uneven thickness causes.
Further optimization, a kind of manufacture method of square lithium ion battery winding battery core as above, described interior shelf is insulation roll pin, the manufacture method of described square lithium ion battery winding battery core comprises the following steps: described positive plate, barrier film and negative plate are arranged with sandwich formats, during winding after barrier film first doubling winding one circle, negative plate is put in the middle of barrier film, reel a circle again, on the upside of barrier film, put into positive plate winding form, make positive pole ear and negative lug be positioned at the homonymy of volume pin.Adopt this technical scheme, positive and negative electrode lug, at the homonymy of described insulation roll pin, has unified pole piece convergent-divergent trend, reduces the pole piece distortion that lug place uneven thickness causes.
Further optimization, a kind of manufacture method of square lithium ion battery winding battery core as above, described interior shelf is hollow sting, the manufacture method of described square lithium ion battery winding battery core comprises the following steps: first according to battery size design positive plate, the material blank district of negative plate, and painting is covered with active material in other regions, by the positive plate containing material blank district, barrier film, negative plate containing material blank district is arranged in sandwich formats in order, after barrier film first doubling winding one circle, the described negative plate blanked in advance is put in the middle of barrier film, be wound on pin by guide roller, after winding one circle, the described positive plate blanked in advance is put on the upside of barrier film, winding forms again, at pole piece material clear area adhesive coating in winding process, make positive plate, negative plate is mutually bonding with barrier film respectively, volume pin is extracted after completing, again by the core side of putting into shell, encapsulation, fluid injection, change into, partial volume.
Further optimization, described pole piece material clear area is the winding positive plate of battery core, the crooked position of negative plate, and the gluing mode adopted in winding process is pole piece whole bending semi arch region gluing.Adopt this technical scheme, make to be bonded as one between each pole piece, core inside forms the STRESS VARIATION between hollow sting dispersion core pole piece in charge and discharge process, solves pole piece distortion in use and the problem of easy dry linting.
Further optimization, the coating design of positive plate and negative plate is as follows: volume pin thickness is d
1, dual coating material positive plate, barrier film and dual coating material negative plate gross thickness are d
2, volume pin width is w, and battery core thickness is T, and every one deck of positive plate and/or negative plate winding is divided into the first coating zone, the first material blank district, the second coating zone and the second material blank district, described coating zone and material blank district staggered designs all successively; Like this, the width in the first coating zone of positive plate and/or negative plate design, the first material blank district, the second coating zone and the second material blank district is followed successively by from innermost layer to outermost layer:
Ground floor: W, π d
1/ 2, W, π d
1/ 2;
The second layer: W+2d
2, π (d
1/ 2+d
2), W+2d
2, π (d
1/ 2+d
2);
Third layer: W+4d
2, π (d
1/ 2+2d
2), W+4d
2, π (d
1/ 2+2d
2);
……;
N-th layer: W+2 (n-1) d
2, π [d
1/ 2+ (n-1) d
2], W+2 (n-1) d
2, π [d
1/ 2+ (n-1) d
2];
The value of n is determined by the thickness T of the finished product battery core designed, and meets T/2=d
1/ 2+ (n-1) d
2.
Further optimization, described adhesive is the one in PVDF or PTFE.Described PVDF or PTFE is the conventional adhesive during electrodes of lithium-ion batteries makes, and has better safety and stability.
The technical solution of the utility model, the square winding battery core pole piece produced for traditional handicraft is in use easily crumpled the problem of distortion and the easy dry linting in pole piece knee, changes traditional fabrication thinking, introduces square winding battery core inner support framework.In battery cycle charge-discharge process, battery core inner support framework has disperseed the STRESS VARIATION of battery core pole piece convergent-divergent in charge and discharge process, avoids the problem on deformation of pole piece; Meanwhile, positive pole ear and negative lug are distributed in the homonymy of volume pin, weaken local thickness further and change the pole piece that causes and be out of shape and crumple.
Compared with prior art, the beneficial effects of the utility model are:
The first, improve the caducous problem of material on traditional square winding yielding problem of the pole piece of battery core in charge and discharge cycles and the bending semi-circular shape position of pole piece.
The second, maintain to greatest extent square lithium ion battery static and charge and discharge cycles dynamically under consistency.
3rd, improve the winding production qualification rate of battery core, the fail safe of square lithium ion battery, create condition for square winding battery core is reliably applied in electrokinetic cell field.
Accompanying drawing explanation
Fig. 1 is the stacked sandwich structure schematic diagram of a kind of embodiment of the utility model positive plate, barrier film and negative plate.
Fig. 2 is the structural representation of the square volume pin of a kind of embodiment of the utility model.
Fig. 3 is the structural representation of the roll coil of strip pin square winding battery core of a kind of embodiment of the utility model.
Fig. 4 is the structural representation of the square winding battery core of the hollow support framework of the another kind of embodiment of the utility model.
Be labeled as in figure: 1-positive plate; 2-barrier film; 3-negative plate; 4-insulation roll pin; 5-hollow sting; 6-finishes up adhesive tape; 7-glue sites; 11-positive pole ear; 31-negative lug.
Embodiment
Below in conjunction with accompanying drawing, preferably embodiment of the present utility model is described in further detail.
Embodiment 1:
As shown in Fig. 1 ~ Fig. 3, a kind of square lithium ion battery winding battery core, comprise positive plate 1, barrier film 2 and negative plate 3, described positive plate 1 is provided with positive pole ear 11, and described negative plate 3 is provided with negative lug 32, the center of described square lithium ion battery winding battery core is provided with interior shelf, described interior shelf is insulation roll pin 4, and described insulation roll pin 4 is of a size of: thickness T1 is 10mm, length W1 is 280mm, width H1 is 230mm, as shown in Figure 2; Finished product battery core is of a size of: battery core thickness T2 is 40mm, and battery core length W2 is 310mm, and battery core width H2 is 230mm; The cross section of the outer surface of described insulation roll pin 4 left and right sides wall is semicircular arc; The material of described insulation roll pin 4 is PTFE; Described positive pole ear 11 and negative lug 31 are positioned at the homonymy of described insulation roll pin 4.
Finished product battery core design capacity is 100Ah, 3.2V, and positive plate 1 is LiFePO4, and negative plate 3 is graphite, and pole piece is arranged with sandwich structure, as shown in Figure 1.During winding after barrier film 2 first doubling winding one circle, in the middle of barrier film 2, put into negative plate 3, then the circle that reels, on the upside of barrier film 2, put into positive plate 1 winding form, be wound up into the last ending adhesive tape 5 that adopts and be fixed.Like this, make positive pole ear 11 and negative lug 31 at the homonymy of described insulation roll pin 4, there is unified pole piece convergent-divergent trend, reduce the pole piece distortion that lug place uneven thickness causes.
When adopting 20 such monomer battery core series connection to use, 0.2C discharge voltage dynamic change consistency is good: 50%DOD, △ V is about 5.6mV; 80%DOD, △ V is about 7.4mV; 90%DOD, △ V is about 10.2mV.
Embodiment 2:
On the basis of embodiment 1, as shown in Fig. 1 ~ Fig. 3, a kind of square lithium ion battery winding battery core, the material of the pin of insulation roll described in this example 4 is PP, and described insulation roll pin 4 is of a size of: thickness T1 is 5mm, length W1 is 215mm, width H1 is 210mm, as shown in Figure 2; Finished product battery core is of a size of: battery core thickness T2 is 20mm, and battery core length W2 is 230mm, and battery core width H2 is 210mm; The cross section of the outer surface of described insulation roll pin 4 left and right sides wall is semicircular arc; Described positive pole ear 11 and negative lug 31 are positioned at the homonymy of described insulation roll pin 4.
Finished product battery core design capacity is 45Ah, 3.2V, and positive plate 1 is LiFePO4, and negative plate 3 is graphite, and pole piece is arranged with sandwich structure.When 16 battery core series connection use, 0.3C discharge voltage dynamic change consistency is good: 50%DOD, △ V is about 5.2mV; 80%DOD, △ V is about 6.3mV; 90%DOD, △ V is about 9.6mV.
Case study on implementation 3:
As shown in Figure 1 and Figure 4, a kind of square lithium ion battery winding battery core, comprise positive plate 1, barrier film 2 and negative plate 3, described positive plate 1 is provided with positive pole ear 11, described negative plate 3 is provided with negative lug 32, the center of described square lithium ion battery winding battery core is provided with interior shelf, and described interior shelf is hollow sting 5, and described hollow sting 5 is for adopting the bonding formation of pole piece coiling; Described positive pole ear 11 and negative lug 31 are positioned at the homonymy of described hollow sting 5.
Described hollow sting 5 be in pole piece coiling process to gluing on the bending semi-circular shape position of pole piece, make between each pole piece, to be bonded as one, and the supporting structure formed.Described pole piece coiling bonding site is material blank district, first according to the material blank district of lithium ion battery size design positive plate 1 and negative plate 3, by the positive pole 1 containing material blank district, barrier film, negative plate 3 containing material blank district is arranged in sandwich formats in order, be wound on pin by guide roller, at positive plate 1 in winding process, the material blank district adhesive coating of negative plate 3, make positive plate 1, negative plate 3 is mutually bonding with barrier film 2 respectively, volume pin is extracted after completing, original positive plate 1, negative plate 3 bonds together with barrier film 2 respectively and forms hollow sting 5, by in the battery core side of putting into shell, then encapsulate, fluid injection, change into and partial volume.Described adhesive is PVDF.
Described volume pin is of a size of: thickness d 1 is 5mm, length W is 215mm, and width H is 210mm;
Finished product battery core is of a size of: battery core thickness T3 is 20mm, and battery core length W3 is 230mm, and battery core width H3 is 210mm; Positive plate 1 is LiFePO4, and negative plate 3 is graphite, and pole piece is arranged with sandwich structure, as shown in Figure 1.
Finished product battery core design capacity is 45Ah, 3.2V, every one deck that positive plate 1 and negative plate 3 reel is divided into the first coating zone, the first material blank district, the second coating zone and the second material blank district, described coating zone and material blank district staggered designs all successively; Like this, positive plate 1 and negative plate 3 design the first coating zone, the first material blank district, the second coating zone and the second material blank district width be followed successively by from innermost layer to outermost layer:
Ground floor: 215, π 5/2,215, π 5/2;
The second layer: 215+2*0.33, π (5/2+0.33), 215+20.33, π (5/2+0.33);
…….；
N-th layer: 215+2 (n-1) * 0.33, π [5/2+ (n-1) * 0.33], 215+2(n-1) * 0.33, π [5/2+ (n-1) * 0.33];
N is 24.
When 16 monomer battery core series connection use, 0.3C discharge voltage dynamic change consistency is good: 50%DOD, △ V is about 5.8mV; 80%DOD, △ V is about 7.6mV; 90%DOD, △ V is about 13.4mV.
Comparative example 1:
Conventional finished product battery core design capacity is 100Ah, 3.2V, and finished product battery core size battery core thickness T2 × battery core length W2 × battery core width H2 is 30mm × 310mm × 230mmm.Positive plate is LiFePO4, and negative plate is graphite, and pole piece aligns with sandwich structure, and conventional winding, after having reeled, extracts volume pin, be packaged into conventional square battery core.When 20 monomer battery core series connection use, voltage dynamic change consistency difference is larger: 50%DOD, △ V is about 8.2mV; 80%DOD, △ V is about 27.1mV; 90%DOD, △ V is about 63.6mV.
The embodiment of the above is better embodiment of the present utility model; not limit concrete practical range of the present utility model with this; scope of the present utility model comprises and is not limited to this embodiment, and the equivalence change that all shapes according to the utility model, structure are done is all in protection range of the present utility model.
Claims (9)
1. a square lithium ion battery winding battery core, it is characterized in that: comprise positive plate, barrier film and negative plate, described positive plate is provided with positive pole ear, and described negative plate is provided with negative lug, and the center of described square lithium ion battery winding battery core is provided with interior shelf.
2. square lithium ion battery according to claim 1 winding battery core, is characterized in that: described interior shelf is the one in insulation roll pin or hollow sting.
3. square lithium ion battery winding battery core according to claim 2, it is characterized in that: described interior shelf is insulation roll pin, the thickness of described insulation roll pin is 5 ~ 10mm.
4. square lithium ion battery winding battery core according to claim 3, is characterized in that: the cross section of the outer surface of described insulation roll pin two side is semicircular arc.
5. square lithium ion battery according to claim 3 winding battery core, is characterized in that: the material of described insulation roll pin be in PTFE, PP, PE, PFA, PPO, PSF, PSU, PES or PASF any one.
6. square lithium ion battery winding battery core according to claim 2, it is characterized in that: described interior shelf is hollow sting, described hollow sting is the bonding formation of pole piece coiling; Wherein, described pole piece is that positive plate is or/and negative plate.
7. square lithium ion battery winding battery core according to claim 6, is characterized in that: described pole piece coiling bonding site is material blank district.
8. square lithium ion battery winding battery core according to claim 6, is characterized in that: the crooked position of described pole piece coiling is material blank district.
9. the square lithium ion battery winding battery core according to claim 1 ~ 8 any one, is characterized in that: described positive pole ear and negative lug are positioned at the homonymy of described interior shelf.
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|---|---|---|---|
| CN201520484647.6U CN204885328U (en) | 2015-07-07 | 2015-07-07 | Square lithium ion battery electric core of convoluteing |
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| CN201520484647.6U CN204885328U (en) | 2015-07-07 | 2015-07-07 | Square lithium ion battery electric core of convoluteing |
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| CN204885328U true CN204885328U (en) | 2015-12-16 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104966852A (en) * | 2015-07-07 | 2015-10-07 | 李震祺 | Square lithium ion battery winding cell and manufacturing method for same |
| CN106140870A (en) * | 2016-07-04 | 2016-11-23 | 东南大学 | Lithium battery pole slice auto reeling method |
| CN106299465A (en) * | 2016-11-07 | 2017-01-04 | 珠海格力电器股份有限公司 | A kind of soft-package battery |
| WO2021129449A1 (en) * | 2019-12-27 | 2021-07-01 | 宁德新能源科技有限公司 | Battery cell and battery with same |
| WO2022120651A1 (en) * | 2020-12-09 | 2022-06-16 | 宁德新能源科技有限公司 | Wound electrode assembly, electrochemical device, and electronic device |
| CN116454404A (en) * | 2023-06-20 | 2023-07-18 | 宁德时代新能源科技股份有限公司 | Secondary battery, preparation method thereof, battery module, battery pack and power utilization device |
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2015
- 2015-07-07 CN CN201520484647.6U patent/CN204885328U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104966852A (en) * | 2015-07-07 | 2015-10-07 | 李震祺 | Square lithium ion battery winding cell and manufacturing method for same |
| CN104966852B (en) * | 2015-07-07 | 2017-11-24 | 李震祺 | A kind of square lithium ion battery winding battery core and preparation method thereof |
| CN106140870A (en) * | 2016-07-04 | 2016-11-23 | 东南大学 | Lithium battery pole slice auto reeling method |
| CN106299465A (en) * | 2016-11-07 | 2017-01-04 | 珠海格力电器股份有限公司 | A kind of soft-package battery |
| CN106299465B (en) * | 2016-11-07 | 2019-02-19 | 珠海格力电器股份有限公司 | A kind of soft-package battery |
| WO2021129449A1 (en) * | 2019-12-27 | 2021-07-01 | 宁德新能源科技有限公司 | Battery cell and battery with same |
| WO2022120651A1 (en) * | 2020-12-09 | 2022-06-16 | 宁德新能源科技有限公司 | Wound electrode assembly, electrochemical device, and electronic device |
| CN116454404A (en) * | 2023-06-20 | 2023-07-18 | 宁德时代新能源科技股份有限公司 | Secondary battery, preparation method thereof, battery module, battery pack and power utilization device |
| CN116454404B (en) * | 2023-06-20 | 2023-09-22 | 宁德时代新能源科技股份有限公司 | Secondary battery, preparation method thereof, battery module, battery pack and power utilization device |
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| GR01 | Patent grant |