CN205828550U - Takeup type battery core - Google Patents
Takeup type battery core Download PDFInfo
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- CN205828550U CN205828550U CN201620541347.1U CN201620541347U CN205828550U CN 205828550 U CN205828550 U CN 205828550U CN 201620541347 U CN201620541347 U CN 201620541347U CN 205828550 U CN205828550 U CN 205828550U
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- pole piece
- type battery
- collector
- takeup type
- battery core
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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
This utility model provides a kind of takeup type battery core, comprising: the first pole piece, has the first collector and the first active material layer being coated on the first collection liquid surface；Second pole piece, has the second collector and the second active material layer being coated on the second collection liquid surface；And isolating membrane, it is arranged between the first pole piece and the second pole piece, so that the first pole piece and the second pole piece are kept apart.Wherein, in the longitudinal direction, the first volume of the first pole piece extends towards different directions around the initial segment respectively around the volume Two of the initial segment and the second pole piece, and the first volume is the most relative around the inner side of the initial segment through-thickness with volume Two around the inner side of the initial segment through-thickness；3rd winding the initial segment of isolating membrane volume Two around the initial segment and the first volume between the initial segment.Takeup type battery core of the present utility model can form a kind of pole piece mutual-inserting type structure at the winding center of described takeup type battery core, and realizes automatization's winding of described takeup type battery core.
Description
Technical field
This utility model relates to field of batteries, particularly relates to a kind of takeup type battery core.
Background technology
In recent years, along with the renewal speed of the product such as electronic equipment, electric tool is constantly accelerated, its various function is very big
Enrich the life of people, bring the requirement to battery more and more higher with this: quick charge speed/velocity of discharge, more high energy
Metric density, temperature rise lower in using.
A kind of battery and secondary electricity is disclosed in Chinese patent literature CN2809895Y announced on August 23rd, 2006
Pond, in the longitudinal direction, the first volume of positive plate around the volume Two of the initial segment and negative plate around the initial segment respectively towards not Tongfang
To extension, and the first volume around the inner side of the initial segment through-thickness with volume Two around the direct phase in the inner side of the initial segment through-thickness
Right.This kind of structure can reduce battery thickness thus increase the energy density of battery, but the battery core structure of this patent
Isolating membrane be one, and its winding method determines and can only wind by hand, and production efficiency is low, cost is high.
Utility model content
In view of problem present in background technology, the purpose of this utility model is to provide a kind of takeup type battery core, its energy
Winding center in described takeup type battery core forms a kind of pole piece mutual-inserting type structure, and realizes the automatization of described takeup type battery core
Winding.
To achieve these goals, this utility model provides a kind of takeup type battery core, comprising: the first pole piece, has
First collector and the first active material layer being coated on the first collection liquid surface；Second pole piece, have the second collector and
The second active material layer being coated on the second collection liquid surface；And isolating membrane, be arranged at the first pole piece and the second pole piece it
Between, so that the first pole piece and the second pole piece are kept apart.Wherein, in the length directionl, the first volume of the first pole piece around the initial segment and
The volume Two of the second pole piece extends towards different directions respectively around the initial segment, and the first volume is around the inner side of the initial segment through-thickness
The most relative around the inner side of the initial segment through-thickness with volume Two；3rd winding the initial segment of isolating membrane is positioned at volume Two around rising
Beginning section and the first volume are between the initial segment.
The beneficial effects of the utility model are as follows:
According in takeup type battery core of the present utility model, the first volume of the first pole piece is around the initial segment and the of the second pole piece
The extension of two winding the initial segment and the mode of layout so that the winding center of described takeup type battery core forms a kind of pole piece mutual-inserting type
Structure, and due to isolating membrane the 3rd winding the initial segment volume Two around the initial segment and the first volume between the initial segment, therefore
3rd winding the initial segment of isolating membrane and then can be capable of described takeup type battery core with on the volume pin being clamped in winding apparatus
Automatization winding.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the takeup type battery core of prior art；
Fig. 2 is the schematic diagram during winding according to takeup type battery core of the present utility model, wherein the first volume around the initial segment,
Two winding the initial segment, the 3rd winding the initial segment, the 3rd end all indicate by dashed box；
Fig. 3 is the schematic diagram of the first embodiment according to takeup type battery core of the present utility model, and wherein the first volume is around initial
Section, volume Two all indicate by dashed box around the initial segment, the 3rd winding the initial segment, the 3rd end；
Fig. 4 is the schematic diagram of the second embodiment according to takeup type battery core of the present utility model, and wherein the first volume is around initial
Section, volume Two all indicate by dashed box around the initial segment, the 3rd winding the initial segment, the 3rd end；
Fig. 5 is the schematic diagram of the 3rd embodiment according to takeup type battery core of the present utility model, and wherein the first volume is around initial
Section, volume Two all indicate by dashed box around the initial segment, the 3rd winding the initial segment, the 3rd end；
Fig. 6 is the schematic diagram of the 4th embodiment according to takeup type battery core of the present utility model, and wherein the first volume is around initial
Section, volume Two all indicate by dashed box around the initial segment, the 3rd winding the initial segment, the 3rd end；
Fig. 7 is the schematic diagram of the 5th embodiment according to takeup type battery core of the present utility model, and wherein the first volume is around initial
Section, volume Two all indicate by dashed box around the initial segment, the 3rd winding the initial segment, the 3rd end.
Wherein, description of reference numerals is as follows:
1 first pole piece 3 isolating membrane
The 11 first collector E1 first volumes are around the initial segment
12 first active material layer E2 volume Twos are around the initial segment
13 blank first collector P2 the second ends
14 first groove E3 the 3rd wind the initial segment
2 second pole piece P3 the 3rd ends
21 second collector G gummed papers
22 second S volume of pins of active material layer
23 blank second collector T thickness directions
24 second groove L length directions
Detailed description of the invention
Describe takeup type battery core of the present utility model with reference to the accompanying drawings in detail.
With reference to Fig. 2 to Fig. 7, include according to takeup type battery core of the present utility model: the first pole piece 1, there is the first collector
11 and the first active material layer 12 of being coated on the first collector 11 surface；Second pole piece 2, has the second collector 21 and is coated with
Overlay on the second active material layer 22 on the second collector 21 surface；And isolating membrane 3, it is arranged at the first pole piece 1 and the second pole
Between sheet 2, so that the first pole piece 1 and the second pole piece 2 are kept apart.Wherein, in the length directionl, the first volume of the first pole piece 1 around
The volume Two of the initial segment E1 and the second pole piece 2 extends towards different directions respectively around the initial segment E2, and the first volume is around the initial segment E1
The inner side of through-thickness T is the most relative around the inner side of the initial segment E2 through-thickness T with volume Two；Volume three of isolating membrane 3
Around the initial segment E3 volume Two around the initial segment E2 and the first volume between the initial segment E1.
According in takeup type battery core of the present utility model, the first volume of the first pole piece 1 is around the initial segment E1 and the second pole piece 2
The volume Two extension around the initial segment E2 and the mode of layout so that the winding center of described takeup type battery core forms a kind of pole piece
Mutual-inserting type structure, and owing to the 3rd winding the initial segment E3 of isolating membrane 3 is positioned at volume Two around the initial segment E2 and the first volume around initial
Between section E1, therefore the 3rd winding the initial segment E3 of isolating membrane 3 can with on the volume pin S being clamped in winding apparatus, and then can
Realize automatization's winding of described takeup type battery core.
In the embodiment according to takeup type battery core of the present utility model, with reference to Fig. 3 to Fig. 7, in the thickness directiont,
The volume Two of the second pole piece 2 is respectively equipped with one layer of isolating membrane 3 around the inner side and outer side of the initial segment E2, and two-layer isolating membrane 3 surpasses
Go out volume Two and be positioned at the volume Two inner side around the initial segment E2 through-thickness T, and two around the part of the second end P of the initial segment E2
Layer isolating membrane 3 is positioned at volume Two part inside the initial segment E2 and collectively constitutes the 3rd winding the initial segment E3 of isolating membrane 3.Second
The second end P of winding the initial segment E2 is the position at the free end place that the second pole piece 2 winding initiates.
In the embodiment according to takeup type battery core of the present utility model, with reference to Fig. 2 to Fig. 7, the first of the first pole piece 1
Winding the initial segment E1 is one layer of first pole piece 1 of the side of next-door neighbour's winding center (i.e. next-door neighbour's volume pin S) through-thickness T；Second
The volume Two of pole piece 2 is around one layer of the opposite side that the initial segment E2 is next-door neighbour winding center (i.e. next-door neighbour volume pin S) through-thickness T the
Two pole pieces 2.
In the embodiment according to takeup type battery core of the present utility model, with reference to Fig. 3, the 3rd of isolating membrane 3 winds
3rd end P3 of beginning section E3 winds between the initial segment E3 around the initial segment E2 and the 3rd at volume Two.3rd winding the initial segment E3
The 3rd end P3 be the 3rd winding the initial segment E3 winding time be clamped in volume pin S on part.
In the embodiment according to takeup type battery core of the present utility model, with reference to Fig. 4 to Fig. 7, volume three of isolating membrane 3
Extend and not inflection around the 3rd end P3 L along its length of the initial segment E3.
In the embodiment according to takeup type battery core of the present utility model, with reference to Fig. 2 to Fig. 7, it is positioned at the first pole piece 1
The first volume is coated with the first active material layer 12 on 11 two surfaces of the first collector of the initial segment E1；It is positioned at the second pole piece
The volume Two of 2 is coated with the second active material layer 22 on 21 two surfaces of the second collector of the initial segment E2.Due to described
The winding center of takeup type battery core forms a kind of pole piece mutual-inserting type structure, so being positioned at the first volume the first afflux around the initial segment E1
The first active material layer 12 on two surfaces of body 11 is all the most relative with the second active material layer 22, is positioned at volume Two simultaneously
The second active material layer 22 on two surfaces of the second collector 21 of the initial segment E2 is all straight with the first active material layer 12
Connect relatively, it is ensured that lithium ion around the first collector 11 of the initial segment E1 and can be positioned at volume Two around the initial segment being positioned at the first volume
Realize between second collector 21 of E2 coming and going embedding and deintercalation, improve the capacity of described takeup type battery core, it is to avoid activity material
The waste of material, and improve battery core energy density (in the prior art, with reference to Fig. 1, winding innermost circle with the first pole piece 1
The second active material layer 22 of the first active material layer 12 correspondence, cause the waste of the first active material layer 12, increase simultaneously
Battery core thickness, reduces battery core energy density).
In the embodiment according to takeup type battery core of the present utility model, it is positioned at the first volume of the first pole piece 1 around initial
All it is not coated with the first active material layer 12 on two surfaces of first collector 11 of section E1, or is positioned at the of the first pole piece 1
The outer application of the first collector 11 only through-thickness T of one winding the initial segment E1 has the first active material layer 12.
In the embodiment according to takeup type battery core of the present utility model, it is positioned at the volume Two of the second pole piece 2 around initial
All it is not coated with the second active material layer 22 on two surfaces of second collector 21 of section E2, or is positioned at the of the second pole piece 2
The outer application of the second collector 21 only through-thickness T of two winding the initial segment E2 has the second active material layer 22.
In the embodiment according to takeup type battery core of the present utility model, with reference to Fig. 7, the two of whole piece the first collector 11
The first active material layer 12 it is coated with on individual surface.
In the embodiment according to takeup type battery core of the present utility model, with reference to Fig. 6, the afterbody of the first pole piece 1 has
Blank first collector 13 of uncoated first active material layer 12 in two sides, blank first collector 13 is positioned at takeup type battery core
Outermost at least parcel takeup type battery core one are enclosed.Blank first collector 13 preferably wraps up takeup type battery core 1～2 circle.
In the embodiment according to takeup type battery core of the present utility model, the blank with the first pole piece 1 of the second pole piece 2
First collector 13 directly relative to uncoated second active material layer 22 in surface.Therefore, suffer excessively when described takeup type battery core
Used time, being wrapped in outermost blank first collector 13 of takeup type battery core can be preferentially with uncoated the second of the second pole piece 2
Second collector 21 of active material layer 22 is short-circuited, thus avoids the safety problems such as burning or blast.
In the embodiment according to takeup type battery core of the present utility model, with reference to Fig. 3, Fig. 4, Fig. 6 and Fig. 7, whole piece the
It is coated with the second active material layer 22 on two surfaces of two collectors 21.
In the embodiment according to takeup type battery core of the present utility model, with reference to Fig. 5, the afterbody of the second pole piece 2 has
Blank second collector 23 of uncoated second active material layer 22 in two sides, blank second collector 23 is positioned at takeup type battery core
Outermost at least parcel takeup type battery core one are enclosed.Blank second collector 23 preferably wraps up takeup type battery core 1～2 circle.
In the embodiment according to takeup type battery core of the present utility model, with reference to Fig. 5, the first pole piece 1 with the second pole
Blank second collector 23 of sheet 2 directly relative to uncoated first active material layer 12 in surface.Therefore, when described takeup type electricity
When core is abused, being wrapped in outermost blank second collector 23 of takeup type battery core can preferentially with the first pole piece 1 not
The first collector 11 coating the first active material layer 12 is short-circuited, thus avoids the safety problems such as burning or blast.
In the embodiment according to takeup type battery core of the present utility model, with reference to Fig. 7, the afterbody of isolating membrane 3 is positioned at volume
Outermost at least parcel takeup type battery core one of wound battery core are enclosed.
In the embodiment according to takeup type battery core of the present utility model, the first pole piece 1 can be anode pole piece or
Cathode pole piece, accordingly, the second pole piece 2 is cathode pole piece or anode pole piece.Preferably, the first pole piece 1 is anode pole piece, the
Two pole pieces 2 are cathode pole piece, and accordingly, the first active material layer 12 is positive electrode active material layer, is specifically as follows cobalt acid lithium, phosphorus
At least one in acid ferrum lithium, LiMn2O4.Second active material layer 22 is negative electrode active material layer, is specifically as follows in carbon and silicon
At least one.
In the embodiment according to takeup type battery core of the present utility model, with reference to Fig. 3 to Fig. 7, anode pole piece with negative
The initial end of pole pole piece coiling directly relative to part post gummed paper G.With reference to Fig. 3 to Fig. 7, wherein with the first pole piece 1 for just
Pole pole piece, the second pole piece 2 is cathode pole piece, and the second active material layer 22 of the end that cathode pole piece winding is initial is easily analysed
Lithium, causes the capacity of takeup type battery core to reduce, the lost of life, and there is serious potential safety hazard, and pastes gummed paper G and can keep away
Exempt from this situation.
In the embodiment according to takeup type battery core of the present utility model, described takeup type battery core also includes: the first pole
Ear, electrically connects with the first collector 11, and the first lug is one or more；Second lug, electrically connects with the second collector 21,
And second lug be one or more.
In the embodiment according to takeup type battery core of the present utility model, the first lug and first collector 11 1 bodily form
Become.
In the embodiment according to takeup type battery core of the present utility model, the second lug and second collector 21 1 bodily form
Become.
In the embodiment according to takeup type battery core of the present utility model, with reference to Fig. 2 to Fig. 7, the first pole piece 1 also has
First groove 14, bottom for blank the first collector 13 of exposing week side be the first active material layer 12, the first lug is placed in
Electrically connect in first groove 14 and with the first collector 11.
In the embodiment according to takeup type battery core of the present utility model, with reference to Fig. 2 to Fig. 7, the second pole piece 2 also has
Second groove 24, bottom for blank the second collector 23 of exposing week side be the second active material layer 22, the second lug is placed in
Electrically connect in second groove 24 and with the second collector 21.
According in takeup type battery core of the present utility model, all sides of the first groove 14 can be that three bandings close and open
Mouthful, it is also possible to it is closing both sides, both sides openings；All sides of the second groove 24 can be that three bandings close openings at one side, it is also possible to is two
Banding closes both sides opening.
In the embodiment according to takeup type battery core of the present utility model, with reference to Fig. 2, the 3rd of isolating membrane 3 winds
3rd end P3 of beginning section E3 can be clamped on the volume pin S of winding apparatus, removes the volume detaching winding apparatus after having wound
Pin S, the 3rd end P3 both may be located at volume Two around between the initial segment E2 and the 3rd winding the initial segment E3, it is also possible to along length side
Extend and not inflection to L.
Claims (17)
1. a takeup type battery core, including:
First pole piece (1), has the first collector (11) and the first active substance being coated on the first collector (11) surface
Layer (12)；
Second pole piece (2), has the second collector (21) and the second active substance being coated on the second collector (21) surface
Layer (22)；And
Isolating membrane (3), is arranged between the first pole piece (1) and the second pole piece (2), with by the first pole piece (1) and the second pole piece (2)
Keep apart；
It is characterized in that,
On length direction (L), the first volume of the first pole piece (1) around the initial segment (E1) and the second pole piece (2) volume Two around rise
Beginning section (E2) extends towards different directions respectively, and the first volume is around the inner side of the initial segment (E1) through-thickness (T) and volume Two
The most relative around the inner side of the initial segment (E2) through-thickness (T)；
3rd winding the initial segment (E3) of through-thickness (T) isolating membrane (3) is positioned at volume Two around the initial segment (E2) and the first volume
Between the initial segment (E1).
Takeup type battery core the most according to claim 1, it is characterised in that
On thickness direction (T), the volume Two of the second pole piece (2) be respectively equipped with around the inner side and outer side of the initial segment (E2) one layer every
From film (3), and two-layer isolating membrane (3) is positioned at volume Two beyond volume Two around the part of the second end (P) of the initial segment (E2)
Around the inner side of the initial segment (E2) through-thickness (T), and two-layer isolating membrane (3) is positioned at the volume Two portion around the initial segment (E2) inner side
Divide the 3rd winding the initial segment (E3) collectively constituting isolating membrane (3).
Takeup type battery core the most according to claim 1 and 2, it is characterised in that the 3rd winding the initial segment of isolating membrane (3)
(E3) the 3rd end (P3) is positioned at volume Two around between the initial segment (E2) and the 3rd winding the initial segment (E3).
Takeup type battery core the most according to claim 1 and 2, it is characterised in that the 3rd winding the initial segment of isolating membrane (3)
(E3) the 3rd end (P3) (L) along its length extends and not inflection.
Takeup type battery core the most according to claim 1, it is characterised in that
The first volume being positioned at the first pole piece (1) is coated with first on (11) two surfaces of the first collector of the initial segment (E1)
Active material layer (12)；
The volume Two being positioned at the second pole piece (2) is coated with second on (21) two surfaces of the second collector of the initial segment (E2)
Active material layer (22).
Takeup type battery core the most according to claim 1, it is characterised in that
It is coated with the first active material layer (12) on two surfaces of whole piece the first collector (11).
Takeup type battery core the most according to claim 1, it is characterised in that
The afterbody of the first pole piece (1) has the blank the first collector (13) on uncoated first active material layer in two sides (12), empty
White first collector (13) is positioned at the outermost of takeup type battery core and at least wraps up takeup type battery core one circle.
Takeup type battery core the most according to claim 7, it is characterised in that
Second pole piece (2) with the blank the first collector (13) of the first pole piece (1) directly relative to surface uncoated second live
Property material layer (22).
9. according to the takeup type battery core described in claim 1,5,6 or 7, it is characterised in that
It is coated with the second active material layer (22) on two surfaces of whole piece the second collector (21).
10. according to the takeup type battery core described in claim 1,5 or 6, it is characterised in that
The afterbody of the second pole piece (2) has the blank the second collector (23) on uncoated second active material layer in two sides (22), empty
White second collector (23) is positioned at the outermost of takeup type battery core and at least wraps up takeup type battery core one circle.
11. takeup type battery cores according to claim 10, it is characterised in that the first pole piece (1) with the second pole piece (2)
Blank second collector (23) directly relative to uncoated first active material layer in surface (12).
12. according to the takeup type battery core described in claim 1,5 or 6, it is characterised in that the afterbody of isolating membrane (3) is positioned at winding
Outermost at least parcel takeup type battery core one of formula battery core are enclosed.
13. takeup type battery cores according to claim 1, it is characterised in that the first pole piece (1) is anode pole piece, the second pole
Sheet (2) is cathode pole piece；Or first pole piece (1) be cathode pole piece, the second pole piece (2) is anode pole piece.
14. takeup type battery cores according to claim 13, it is characterised in that initiateing with cathode pole piece winding of anode pole piece
End directly relative to part post gummed paper (G).
15. takeup type battery cores according to claim 1, it is characterised in that described takeup type battery core also includes:
First lug, electrically connects with the first collector (11), and the first lug is one or more；
Second lug, electrically connects with the second collector (21), and the second lug is one or more.
16. takeup type battery cores according to claim 15, it is characterised in that
First lug and the first collector (11) are integrally formed；And/or
Second lug and the second collector (21) are integrally formed.
17. takeup type battery cores according to claim 15, it is characterised in that
First pole piece (1) also has the first groove (14), and bottom is the blank the first collector (13) exposed and week side is first
Active material layer (12), the first lug is placed in the first groove (14) and electrically connects with the first collector (11)；And/or
Second pole piece (2) also has the second groove (24), and bottom is the blank the second collector (23) exposed and week side is second
Active material layer (22), the second lug is placed in the second groove (24) and electrically connects with the second collector (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620541347.1U CN205828550U (en) | 2016-06-06 | 2016-06-06 | Takeup type battery core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620541347.1U CN205828550U (en) | 2016-06-06 | 2016-06-06 | Takeup type battery core |
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| Publication Number | Publication Date |
|---|---|
| CN205828550U true CN205828550U (en) | 2016-12-21 |
Family
ID=57568592
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| CN201620541347.1U Active CN205828550U (en) | 2016-06-06 | 2016-06-06 | Takeup type battery core |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018121133A1 (en) * | 2016-12-27 | 2018-07-05 | 宁德新能源科技有限公司 | Coiled cell |
| WO2021233084A1 (en) * | 2020-05-20 | 2021-11-25 | 宁德新能源科技有限公司 | Battery cell, battery using same, and electronic device |
| US11456479B2 (en) | 2019-03-25 | 2022-09-27 | Dongguan Poweramp Technology Limited | Battery with improved safety |
-
2016
- 2016-06-06 CN CN201620541347.1U patent/CN205828550U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018121133A1 (en) * | 2016-12-27 | 2018-07-05 | 宁德新能源科技有限公司 | Coiled cell |
| US11611100B2 (en) | 2016-12-27 | 2023-03-21 | Ningde Amperex Technology Limited | Coiled cell |
| US11456479B2 (en) | 2019-03-25 | 2022-09-27 | Dongguan Poweramp Technology Limited | Battery with improved safety |
| WO2021233084A1 (en) * | 2020-05-20 | 2021-11-25 | 宁德新能源科技有限公司 | Battery cell, battery using same, and electronic device |
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