CN206098526U - Coiling formula secondary electricity core - Google Patents
Coiling formula secondary electricity core Download PDFInfo
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- CN206098526U CN206098526U CN201621116107.3U CN201621116107U CN206098526U CN 206098526 U CN206098526 U CN 206098526U CN 201621116107 U CN201621116107 U CN 201621116107U CN 206098526 U CN206098526 U CN 206098526U
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- Prior art keywords
- anode
- cathode
- pole piece
- material layer
- initiating terminal
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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 coiling formula secondary electricity core, it includes anode pole piece, cathode and barrier film, on the width direction of secondary electricity core, anode pole piece's coiling starting layer and cathode's coiling starting layer extend towards same direction, and anode pole piece's coiling initiating terminal surpasss cathode's coiling initiating terminal, coated respectively first anode active material layer and first negative pole active material layer of relative one side each other among anode pole piece's coiling starting layer and cathode's the coiling starting layer to first anode active material layer's initiating terminal surpasss first negative pole active material layer's initiating terminal, along anode pole piece's coiling starting layer's extending direction, anode pole piece's coiling initiating terminal is equipped with the blank positive pole mass flow body in the position department that misses the first anode active material layer initiating terminal, and positive pole utmost point ear is fixed on the blank positive pole mass flow body. Compared with the prior art, the utility model discloses coiling formula secondary electricity core has the energy density height, has advantages such as analysing the lithium risk.
Description
Technical field
This utility model belongs to secondary cell field, more particularly to a kind of coiled secondary battery core.
Background technology
Lithium rechargeable battery has in each electronic product widely to be applied.In conventional coiled secondary battery core,
Cathode sheet, the initiating terminal of anode pole piece are designed with blank collector, and cathode tab and anode lug are directly welded at respectively the moon
On blank collector on pole pole piece, anode pole piece.But, due to adding up for lug thickness so that the thickness in soldering polar ear region
The maximum gauge for battery core is spent, and the thickness in unwelded lug region is then relatively small, it is in uneven thickness so that the part of battery
Space can not be fully utilized, and cause in certain gauge size, and the energy density of battery is difficult to further raising.
In order to solve the above problems, the battery core of some secondary cells fixes in the following ways lug：In the activity of pole piece
Arrange in material layer and expose the lug groove of blank collector, and lug is fixed in lug groove, so as to reach lifting energy
The purpose of metric density.But, if the lug of anode and cathode pole piece is provided entirely in lug groove, the lug of anode pole piece is recessed
The lithium that corresponding cathode sheet is deviate from groove will cause battery core to there is analysis lithium risk because of receiving without anode pole piece.
In view of this, it is necessory to provide a kind of secondary battery core that can solve the problem that above-mentioned technical problem.
Utility model content
The purpose of this utility model is：A kind of coiled secondary without analysis lithium risk and with higher energy density is provided
Battery core.
To achieve these goals, this utility model provides a kind of coiled secondary battery core, including anode pole piece, negative electrode
Pole piece and isolating membrane, isolating membrane is interval between adjacent cathode sheet and anode pole piece；
The anode pole piece includes anode collector, the anode active matter being coated on the surface of anode collector at least one
Matter layer and the anode lug being connected electrically in anode collector；
The cathode sheet includes cathode current collector, the cathode activity thing being coated on the surface of cathode current collector at least one
Matter layer and the cathode tab being connected electrically on cathode current collector；
On the width of secondary battery core, the winding initial layers of anode pole piece and the winding initial layers of cathode sheet are towards same
One direction extends, and the winding initial layers length of anode pole piece is more than the winding initial layers length of cathode sheet so that anode pole piece
Winding initiating terminal beyond cathode sheet winding initiating terminal；The winding initial layers of anode pole piece and the winding starting of cathode sheet
One side relative to each other has been respectively coated with first anode active material layer and the first cathode active material layer in layer, and first positive
Initiating terminal of the initiating terminal of pole active material layer beyond the first cathode active material layer；Along the winding initial layers of anode pole piece
Bearing of trend, the winding initiating terminal of anode pole piece is provided with blank at the not up to position of first anode active material layer initiating terminal
Anode collector, anode lug is fixed in blank anode collector.
Improve as one kind of this utility model coiled secondary battery core, on the thickness direction of secondary battery core, described the moon
The winding initial layers of pole pole piece are located at the outside of the winding initial layers of anode pole piece.
Improve as one kind of this utility model coiled secondary battery core, the two sides of the winding initiating terminal of the cathode sheet
It is coated with the first cathode active material layer and does not set blank cathode current collector.
Improve as one kind of this utility model coiled secondary battery core, the cathode tab is directly in cathode sheet width
The reserved blank cathode current collector in degree direction edge.
Improve as one kind of this utility model coiled secondary battery core, the first cathode active material of the cathode sheet
The cathode tab groove for exposing blank cathode current collector is provided with layer, cathode tab is fixed in cathode tab groove.
Improve as one kind of this utility model coiled secondary battery core, the cathode tab groove is not for through negative electrode pole
The three side sealing of piece width is closed, the short groove of one side opening.
Improve as one kind of this utility model coiled secondary battery core, the anode tab welding is in blank anode current collector
On body.
Compared with prior art, this utility model coiled secondary battery core has energy density high, excellent without analysis lithium risk etc.
Point.
Description of the drawings
With reference to the accompanying drawings and detailed description, to this utility model coiled secondary battery core and its Advantageous Effects
It is described in detail.
Fig. 1 is the structural representation of this utility model coiled secondary battery core first embodiment.
Fig. 2 is the electrode tab connection structure schematic diagram of Fig. 1 Anodics pole piece and cathode sheet.
Fig. 3 is the structural representation of this utility model coiled secondary battery core second embodiment.
Fig. 4 is the electrode tab connection structure schematic diagram of Fig. 3 Anodics pole piece and cathode sheet.
Specific embodiment
In order that the purpose of this utility model, technical scheme and Advantageous Effects become apparent from understanding, below in conjunction with attached
Figure and specific embodiment, are further elaborated to this utility model.It should be appreciated that described in this specification
Specific embodiment is not intended to limit this utility model just for the sake of explaining this utility model.
For convenience of description, the shorter edge of cathode sheet and anode pole piece is defined as pole piece width by this utility model
L1, perpendicular pole piece bearing of trend is defined as pole piece length direction L2.It will be understood that due to cathode sheet and anode pole
All along its length L2 is carried out the winding of piece, therefore in the battery core being finally wound into, anode and cathode pole piece width L1
Corresponding is battery core length direction (perpendicular to the direction of paper in Fig. 1), that is to say, that pole piece width L1 and battery core width
Direction L is simultaneously differed, but perpendicular to one another.Similarly, it is battery core width side that the length direction L2 of anode and cathode pole piece is corresponding
To L.
Fig. 1 to Fig. 4 is referred to, the first and second embodiments of this utility model coiled secondary battery core include anode
Pole piece 10, cathode sheet 20 and isolating membrane 30.Anode pole piece 10 includes anode collector 11, is coated in anode collector 11 at least
Anode active material layer 12 on one surface and the anode lug 13 being connected electrically in anode collector 11.Cathode sheet 20 is wrapped
Include cathode current collector 21, the cathode active material layer 22 being coated on the surface of cathode current collector 21 at least one and be connected electrically in the moon
Cathode tab 23 on pole collector 21.Anode pole piece 10, isolating membrane 30 and cathode sheet 20 are wound as takeup type electricity after being laminated
Core, isolating membrane 30 is interval between adjacent anode pole piece 10 and cathode sheet 20.
On the thickness T directions of secondary battery core, the winding initial layers 25 of cathode sheet 20 are located at the winding of anode pole piece 10
The outside of initial layers 15.On the width L of secondary battery core, the winding initial layers 15 of anode pole piece 10 and cathode sheet 20
Winding initial layers 25 extend in the same direction that (to wind initiating terminal as starting point, trend during pole piece coiling is its extension side
To).Length of the length of the winding initial layers 15 of anode pole piece 10 more than the winding initial layers 25 of cathode sheet 20 so that anode
Winding initiating terminal 250 of the winding initiating terminal 150 of pole piece 10 beyond cathode sheet 20.The He of winding initial layers 15 of anode pole piece 10
One side relative to each other has been respectively coated with first anode active material layer 120 and first in the winding initial layers 25 of cathode sheet 20
Cathode active material layer 220, and the initiating terminal of first anode active material layer 120 exceeds the first cathode active material layer 220
Initiating terminal.Along the bearing of trend of the winding initial layers 15 of anode pole piece 10, the winding initiating terminal 150 of anode pole piece 10 is not
Blank anode collector 110 is provided with the position for reaching the initiating terminal of first anode active material layer 120, anode lug 13 is with welding
Mode is fixed in blank anode collector 110, realizes the electrical connection with anode pole piece 10.
The two sides of winding initiating terminal 250 of cathode sheet 20 is coated with the first cathode active material layer 220, does not set blank the moon
Pole collector.
The difference of the first and second embodiments of this utility model coiled secondary battery core is setting for cathode tab 23
Mode is put, is below specifically described.
In the first embodiment shown in Fig. 1 and Fig. 2, set in the first cathode active material layer 220 of cathode sheet 20
There is the cathode tab groove 222 for exposing blank cathode current collector, cathode tab 23 is fixed in cathode tab groove 222.Negative electrode
Lug groove 222 is slightly over the short groove of the fixing end of cathode tab 23, and it is not through the width of cathode sheet 20
L2, therefore three side sealing is closed, one side is open.The generation type of short groove has various, and one of which is first in blank cathode current collector
Lug fixed position paste easily tore film or thermal expansion film, then carry out the continuous coating of cathode active material layer, finally remove easily
Dyestripping or thermal expansion film and form short groove.
In the second embodiment shown in Fig. 3 and Fig. 4, cathode sheet 20 is designed using multi pole ears, that is, in negative electrode
The widthwise edges of pole piece 20 retain multiple blank cathode current collectors not cut off as cathode tab 23.Due to cathode tab
23 is the blank cathode current collector with the one of cathode sheet 20, therefore without the need for separately setting cathode tab groove as junction point.
Compared with prior art, this utility model coiled secondary battery core at least has advantages below：
1) anode lug 13 is fixed in the blank anode collector 110 of winding initiating terminal 150 position of anode pole piece 10,
The winding initiating terminal 150 of anode pole piece 10 exceeds the winding initiating terminal 250 of cathode sheet 20 again, therefore, anode lug 13 is not
Directly corresponding with cathode sheet 20, the presence which ensure that anode lug 13 had both been not result in the thickness increase of secondary battery core, and
Avoid and analysis lithium occur with the cathode sheet 20 of the correspondence position of anode lug 13；
2) cathode sheet 20 had both avoided negative electrode pole using the cathode tab groove 222 or multipole ear structure of one side opening
Ear 23 adds up with the thickness of anode lug 13, because of the presence of cathode tab 23 battery core thickness will not be caused to increase again, is conducive to
Improve the energy density of secondary cell.
According to above-mentioned principle, this utility model can also carry out appropriate change and modification to above-mentioned embodiment.Therefore,
This utility model is not limited to specific embodiment disclosed and described above, to some modifications and changes of the present utility model
Should also be as falling in scope of the claims of the present utility model.Although additionally, some are specific used in this specification
Term, but these terms are merely for convenience of description, do not constitute any restriction to this utility model.
Claims (7)
1. a kind of coiled secondary battery core, including anode pole piece, cathode sheet and isolating membrane, isolating membrane is interval in adjacent negative electrode
Between pole piece and anode pole piece；
The anode pole piece includes anode collector, the anode active material layer being coated on the surface of anode collector at least one
With the anode lug being connected electrically in anode collector；
The cathode sheet includes cathode current collector, the cathode active material layer being coated on the surface of cathode current collector at least one
With the cathode tab being connected electrically on cathode current collector；
It is characterized in that：
On the width of secondary battery core, the winding initial layers of anode pole piece and the winding initial layers of cathode sheet are towards same side
To extension, the winding initial layers length of anode pole piece is more than the winding initial layers length of cathode sheet so that the volume of anode pole piece
Exceed the winding initiating terminal of cathode sheet around initiating terminal；In the winding initial layers of anode pole piece and the winding initial layers of cathode sheet
One side relative to each other has been respectively coated with first anode active material layer and the first cathode active material layer, and the first anode is lived
Property material layer initiating terminal beyond the first cathode active material layer initiating terminal；Along the extension of the winding initial layers of anode pole piece
Direction, the winding initiating terminal of anode pole piece is provided with blank anode at the not up to position of first anode active material layer initiating terminal
Collector, anode lug is fixed in blank anode collector.
2. coiled secondary battery core according to claim 1, it is characterised in that：On the thickness direction of secondary battery core, institute
The winding initial layers for stating cathode sheet are located at the outside for winding initial layers of anode pole piece.
3. coiled secondary battery core according to claim 1, it is characterised in that：The winding initiating terminal of the cathode sheet
Two sides is coated with the first cathode active material layer and does not set blank cathode current collector.
4. coiled secondary battery core according to claim 3, it is characterised in that：The cathode tab is directly in negative electrode pole
The reserved blank cathode current collector of piece widthwise edges.
5. coiled secondary battery core according to claim 3, it is characterised in that：First cathode activity of the cathode sheet
The cathode tab groove for exposing blank cathode current collector is provided with material layer, cathode tab is fixed in cathode tab groove.
6. coiled secondary battery core according to claim 5, it is characterised in that：The cathode tab groove is not for through the moon
The three side sealing of pole pole piece width is closed, the short groove of one side opening.
7. coiled secondary battery core according to claim 1, it is characterised in that：The anode tab welding is in blank anode
On collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621116107.3U CN206098526U (en) | 2016-10-12 | 2016-10-12 | Coiling formula secondary electricity core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621116107.3U CN206098526U (en) | 2016-10-12 | 2016-10-12 | Coiling formula secondary electricity core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206098526U true CN206098526U (en) | 2017-04-12 |
Family
ID=58482486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621116107.3U Active CN206098526U (en) | 2016-10-12 | 2016-10-12 | Coiling formula secondary electricity core |
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| Country | Link |
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| CN (1) | CN206098526U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018099168A1 (en) * | 2016-12-02 | 2018-06-07 | 东莞新能源科技有限公司 | Cathode plate, anode plate, and battery cell |
| CN110808377A (en) * | 2018-08-06 | 2020-02-18 | 宁德新能源科技有限公司 | Battery cell, battery and electronic equipment |
| CN112290072A (en) * | 2019-07-24 | 2021-01-29 | 无锡先导智能装备股份有限公司 | Battery detection method and battery detection system |
| CN113193163A (en) * | 2021-04-28 | 2021-07-30 | 宁德新能源科技有限公司 | Battery cell and power utilization device |
| CN114006076A (en) * | 2021-09-28 | 2022-02-01 | 三一汽车制造有限公司 | Battery cell, battery and vehicle |
| CN115832161A (en) * | 2022-03-29 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery and electric equipment |
| US11637274B2 (en) | 2017-11-09 | 2023-04-25 | Lg Energy Solution, Ltd. | Strip-shaped electrode used for cylindrical jelly roll and lithium secondary battery comprising same |
| EP4106048A4 (en) * | 2021-04-28 | 2023-06-14 | Ningde Amperex Technology Ltd. | Cell and power utilization apparatus |
-
2016
- 2016-10-12 CN CN201621116107.3U patent/CN206098526U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018099168A1 (en) * | 2016-12-02 | 2018-06-07 | 东莞新能源科技有限公司 | Cathode plate, anode plate, and battery cell |
| US11637274B2 (en) | 2017-11-09 | 2023-04-25 | Lg Energy Solution, Ltd. | Strip-shaped electrode used for cylindrical jelly roll and lithium secondary battery comprising same |
| CN110808377A (en) * | 2018-08-06 | 2020-02-18 | 宁德新能源科技有限公司 | Battery cell, battery and electronic equipment |
| CN112290072A (en) * | 2019-07-24 | 2021-01-29 | 无锡先导智能装备股份有限公司 | Battery detection method and battery detection system |
| CN113193163A (en) * | 2021-04-28 | 2021-07-30 | 宁德新能源科技有限公司 | Battery cell and power utilization device |
| CN113193163B (en) * | 2021-04-28 | 2022-08-12 | 宁德新能源科技有限公司 | Battery cell and power utilization device |
| EP4106048A4 (en) * | 2021-04-28 | 2023-06-14 | Ningde Amperex Technology Ltd. | Cell and power utilization apparatus |
| CN114006076A (en) * | 2021-09-28 | 2022-02-01 | 三一汽车制造有限公司 | Battery cell, battery and vehicle |
| CN115832161A (en) * | 2022-03-29 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery and electric equipment |
| WO2023185205A1 (en) * | 2022-03-29 | 2023-10-05 | 宁德时代新能源科技股份有限公司 | Electrode assembly, cell, battery and electric device |
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| GR01 | Patent grant |