CN208352451U - A kind of lithium ion battery - Google Patents
A kind of lithium ion battery Download PDFInfo
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- CN208352451U CN208352451U CN201820622510.6U CN201820622510U CN208352451U CN 208352451 U CN208352451 U CN 208352451U CN 201820622510 U CN201820622510 U CN 201820622510U CN 208352451 U CN208352451 U CN 208352451U
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- winding
- negative electrode
- lithium ion
- positive
- electrode tab
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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 discloses a kind of lithium ion batteries, belong to technical field of lithium ion.The lithium ion battery, including battery core, the battery core is formed by negative electrode tab, inner septum, positive plate and the outer membrane winding being successively bonded, the winding start end of the negative electrode tab is located at the position after 0.8~0.9 circle of positive plate winding start end winding, and the electrode slice of the outmost turns of the battery core is negative electrode tab.The utility model makes battery core innermost circle electrode slice be positive plate, effectively shortens the length of negative electrode tab, reduce cathode space by changing winding method, first winding positive electrode sheet, the positive leaf length of relative increase, and then substantially increases battery core capacity.
Description
Technical field
The utility model relates to technical field of lithium ion, and in particular to one kind improves battery by changing winding method
The lithium ion battery of capacity.
Background technique
With green energy resource environmental protection, the rush of demand of green energy resource storage use aspects, lithium ion battery is winged in recent years
Speed develops into the hot spot of China's new energy industry, and lithium ion battery becomes the bottleneck for solving new energy development.Compared to other
Type is primary, secondary cell, and lithium ion battery has that specific energy is high, high voltage platform, have extended cycle life, environmental hazard is small, nothing
The many merits such as memory effect, while the also bottleneck problem comprising complex manufacturing technology, the easily restrictions development such as short circuit spontaneous combustion.
The processing procedure process of lithium ion battery is main include the following: homogenate, coating, film-making, winding, fluid injection, sealing.Wind work
The positive plate of certain specification made from early period, negative electrode tab are mainly passed through specific combination of process parameters together with diaphragm and existed by sequence
Together, the core of specific standard shape is formed.
Patent document if application publication number is CN105742721A discloses a kind of cylindrical lithium ion battery, including electricity
Core, battery core include the blank foil area of positive plate, negative electrode tab, inner septum and outer diaphragm, positive plate and negative electrode tab as conductive tab
Be located at the both ends of battery core, inner septum, the dressing area of negative electrode tab, outer diaphragm and positive plate dressing area be successively bonded, use
Determine diameter winding termination mode and is wound into battery core.
According to depending on external cell hull shape, the emphasis of battery core R & D design is exactly land productivity to greatest extent for the specification of core
It is designed with battery being optimal of shell space.For cylindrical lithium ion battery, battery core design space is exactly a limit
The cylinder for determining floor space and height, for process safety the considerations of common winding start end and winding end be diaphragm and negative
Pole, specifically: negative electrode tab is added after enclosing in adjustment up- coiler, inner septum elder generation pre-roll 2, and the dressing area of negative electrode tab is placed in inner septum
Between, the blank foil of negative electrode tab extends along the left side of the width direction of inner septum, one roll set 1.5 of inner septum, outer diaphragm and negative electrode tab
Positive plate is added after circle, positive plate dressing area is placed among outer diaphragm, the width direction of the blank foil of positive plate along outer diaphragm
Right side extend, surround together with negative electrode tab, inner septum, outer diaphragm, finally to determine to terminate winding in a manner of diameter.
By taking 18650-2000mAh battery core as an example, according to original winding process, the positive plate and length of length 615mm are needed
It is wound for the negative electrode tab of 670mm.The effect done so is undoubtedly the cathode in limited battery core space and occupies excessive space
And fail to provide available capacity.
Therefore, how efficiently using battery core space and improving battery capacity is those skilled in the art's problem to be solved.
Utility model content
The purpose of the utility model is to provide a kind of lithium ion batteries to change winding side by adjusting positive/negative plate length
Formula efficiently uses the battery core space in battery case, and then improves battery capacity.
To achieve the above objectives, the present invention adopts the following technical solutions:
A kind of lithium ion battery, including battery core, the battery core by be successively bonded negative electrode tab, inner septum, positive plate and outer
Membrane winding is formed, and the winding start end of the negative electrode tab is located at the position after 0.8~0.9 circle of positive plate winding start end winding
It sets, the electrode slice of the outmost turns of the battery core is negative electrode tab.
The production process of the utility model battery core are as follows: by volume needle by inside and outside two-layer separator pre-roll, wherein inner septum is wound
Starting point, which reclines, rolls up needle, then positive plate is inserted between inside and outside diaphragm, then negative electrode tab is inserted into two by 0.8~0.9 circle of winding
It is wound between layer diaphragm, volume needle drives two-layer separator and positive/negative plate to reach setting length, and the electrode slice of outmost turns is negative
Pole piece, membrane winding last lap, winding terminate, two-layer separator are cut off, and wrap up entire core using cut-off adhesive tape with fixation
Battery core inner pole piece relative position.
After battery core is dismantled, it is followed successively by negative electrode tab, inner septum, positive plate and outer diaphragm from top to bottom, the winding of negative electrode tab rises
The 0.8~0.9 of needle perimeter is about rolled up apart from positive plate winding start end in beginning.
Preferably, width≤negative electrode tab width≤inside and outside diaphragm width of positive plate, the length > of inside and outside diaphragm
The length of the length > negative electrode tab of positive plate.
The width of the positive plate includes but is not limited to 57.0mm, 57.5mm, 62.0mm, 62.5mm, can be according to cylinder electricity
Core size carries out flexible design.
Preferably, the positive plate includes plus plate current-collecting body and the positive-active coated on plus plate current-collecting body upper and lower surface
There is one section of upper and lower surface not cover positive-active layer or only in the inner septum that reclines at the winding start end of layer, the positive plate
The positive area Kong Bo of positive-active floor is not covered on one side.
More preferably, the length in the anode area Kong Bo is equal to the perimeter of battery core innermost circle.The length refers to along battery core
The length of circumferencial direction.
Preferably, the positive area Kong Bo of the positive plate and positive-active floor intersection are coated with thermal insulation adhesive tape.
The collector of the positive plate can be single tab, be also possible to two tabs, and tab and empty foil weld are equal
It is coated with the insulating tape of thermal stability.
Preferably, the negative electrode tab includes negative current collector and the negative electrode active coated on negative current collector upper and lower surface
Layer, the winding end of the negative electrode tab have one section of cathode sky foil for only not covering negative electrode active layer in the one side for the inner septum that reclines
Area.
More preferably, the length in the area the cathode Kong Bo is equal to the perimeter of battery core outmost turns.The length refers to along battery core
The length of circumferencial direction.
Preferably, the winding end of the negative electrode tab is longer than the winding end of positive plate.Winding starting point, volume in battery core
Negative electrode tab around end is longer than positive plate, guarantees the safety of manufacture craft.
More preferably, negative electrode tab winding end is longer than 1~5mm of winding end of positive plate.
Preferably, the winding start end of the inner septum and the winding start end of outer diaphragm flush, the positive plate
Winding start end is located at the position after 1.3~1.5 circle of inner septum and outer membrane winding starting point winding.
The diaphragm material includes but is not limited to that polypropylene, polyethylene, polyolefin be compound, polyolefin ceramic composite.
Preferably, the outer layer covers of the battery core have cut-off adhesive tape.
It is that the utility model has the utility model has the advantages that
The utility model makes battery core innermost circle electrode slice be positive plate by changing winding method, first winding positive electrode sheet,
The length for effectively shortening negative electrode tab, reduce cathode space, the positive leaf length of relative increase, and then substantially increases battery core
Capacity.
Detailed description of the invention
Fig. 1 is the diagrammatic cross-section after the expansion of the utility model battery core.
Fig. 2 is the cross-sectional schematic diagram of the utility model battery core.
Specific embodiment
The utility model is described in further detail combined with specific embodiments below.
As shown in Figs. 1-2, a kind of cylindrical lithium ion battery of the utility model, including battery core, battery core is by being successively bonded
Negative electrode tab 1, inner septum 2, positive plate 3 and the winding of outer diaphragm 4 are formed, width≤inner septum of width≤negative electrode tab 1 of positive plate 3
2, the width of outer diaphragm 4, the width of positive plate 3 include but is not limited to 57.0mm, 57.5mm, 62.0mm, 62.5mm, can be according to circle
Column battery core size carries out flexible design.Inner septum 2, outer diaphragm 4 length > positive plate 3 length > negative electrode tab 1 length.
Positive plate 3 includes plus plate current-collecting body 31 and the positive-active layer 32 coated on plus plate current-collecting body upper and lower surface, anode
The positive area Kong Bo 33 that there is one section of one side in the inner septum 2 that reclines not cover positive-active floor 32 at the winding start end of piece 3.Just
The length in the area Ji Kongbo 33 is equal to the perimeter of battery core innermost circle.The positive area Kong Bo 33 of positive plate 3 and positive-active floor 32 have a common boundary
Place is coated with thermal insulation adhesive tape 5.
The collector 31 of positive plate 3 can be single tab, be also possible to two tabs, and tab is wrapped with empty foil weld
It is covered with the insulating tape of thermal stability.
Negative electrode tab 1 includes negative current collector 11 and the negative electrode active layer 12 coated on negative current collector upper and lower surface, cathode
The winding end of piece 1 has one section of area cathode Kong Bo 13 for only not covering negative electrode active floor 12 in the one side for the inner septum 2 that reclines.It is negative
The length in the area Ji Kongbo 13 is equal to the perimeter of battery core outmost turns.
Inner septum 2, outer diaphragm 4 material include but is not limited to polypropylene, polyethylene, polyolefin is compound, polyolefin is ceramic
Composite material.
The production process of battery core are as follows: by volume needle by inner septum 2, outer diaphragm 4 together pre-roll 1.3~1.5 enclose, wherein in every
2 winding start end of film, which reclines, rolls up needle, then positive plate 3 is inserted between inner septum 2, outer diaphragm 4,0.8~0.9 circle of winding, then
Negative electrode tab 1 is inserted between two layers of diaphragm and is wound, volume needle drives two-layer separator and positive/negative plate to reach setting length, cathode
The area Kong Bo 13 encases entire core in outermost, and the winding end of negative electrode tab 1 is longer than 1~5mm of winding end of positive plate 3.Every
Film roll terminates around last lap, winding, and two-layer separator is cut off, and wraps up entire core using cut-off adhesive tape to fix inside battery core
Pole piece relative position.
Battery core obtained, the electrode slice of the innermost circle of battery core are positive plate, and the electrode slice of outmost turns is negative electrode tab.Battery core
Outer layer covers have cut-off adhesive tape.
After battery core is dismantled, raw material are followed successively by negative electrode tab, inner septum, positive plate and outer diaphragm, negative electrode tab from top to bottom
Winding start end about roll up the 0.8~0.9 of needle perimeter apart from positive plate winding start end.The winding start end of positive plate is located at interior
Position after 1.3~1.5 circle of diaphragm and outer membrane winding starting point winding.
It is further illustrated below with reference to the lithium ion battery cell of concrete model.
Embodiment 1
In 18650-2000mAh battery core manufacturing process, by ingredient early period, coating, roll-in, film-making, etc. processes, obtain
The positive plate of length 622mm width 57mm and the negative electrode tab of length 618mm width 58.5mm, wherein positive starting point has 11mm's
There is the empty foil length of 66mm at single side sky foil length, cathode winding end.
Pass through pre-roll two-layer separator 1.3 weeks in winding process, is inserted into sky foil by positive plate towards volume needle direction and rolls up
Needle membrane layer is wound 0.8 week, then negative electrode tab is inserted between two-layer separator and is wound, and volume needle drives two-layer separator and positive/negative plate
Reach setting length, cathode sky layers of foil encases entire core in outermost, and winding terminates to cut off two-layer separator, uses cut-off glue
Band wraps up entire core to fix battery core inner pole piece relative position, finally obtains 18650-2000mAh core.
The process that the negative electrode tab of positive plate and length 670mm compared to length 615mm in original winding process is wound,
Core diameter becomes 16.17mm from 16.47mm, enters shell elasticity accordingly from 92.5% and is reduced to 90.6%.
Embodiment 2
During 18650-2000mAh battery core mentions and is installed with meter, by ingredient early period, coating, roll-in, film-making, etc. processes,
The positive plate of length 631mm width 57mm and the negative electrode tab of length 629mm width 58.5mm are obtained, similarly wherein anode starting
There is the single side sky foil length of 11mm at end, and there is the empty foil length of 66mm at cathode winding end.
Pass through pre-roll two-layer separator 1.1 weeks in winding process, is inserted into sky foil by positive plate towards volume needle direction and rolls up
Needle membrane layer is wound 0.9 week, then negative electrode tab is inserted between two-layer separator and is wound, and volume needle drives two-layer separator and positive/negative plate
Reach setting length, cathode sky layers of foil encases entire core in outermost, and winding terminates to cut off two-layer separator, uses cut-off glue
Band wraps up entire core to fix battery core inner pole piece relative position, finally obtains 18650-2100mAh core.
The process that the negative electrode tab of positive plate and length 670mm compared to length 615mm in original winding process is wound,
Core diameter maintain 16.47mm it is constant, ensure that it is good enter shell elasticity, capacity from 2000 improve to 2100mAh, pass through elder generation
The winding method for entering to enter after anode cathode effectively reduces cathode space, achieves the invention effect for increasing battery core capacity.
The foregoing is merely the specific implementation cases of the utility model patent, but the technical characteristic of the utility model patent is simultaneously
Not limited to this, in the field of the utility model, made changes or modifications all cover any those skilled in the relevant art
Among the scope of the patents of the utility model.
Claims (10)
1. a kind of lithium ion battery, including battery core, which is characterized in that the battery core by be successively bonded negative electrode tab, inner septum, just
Pole piece and outer membrane winding are formed, and the winding start end of the negative electrode tab is located at 0.8~0.9 circle of positive plate winding start end winding
Position afterwards, the electrode slice of the outmost turns of the battery core are negative electrode tab.
2. lithium ion battery as described in claim 1, which is characterized in that the positive plate includes plus plate current-collecting body and is coated on
There is one section of upper and lower surface not cover at the winding start end of the positive-active layer of plus plate current-collecting body upper and lower surface, the positive plate
Positive-active floor or the positive area Kong Bo for only not covering positive-active floor in the one side for the inner septum that reclines.
3. lithium ion battery as claimed in claim 2, which is characterized in that it is most interior that the length in the anode area Kong Bo is equal to battery core
The perimeter of circle.
4. lithium ion battery as claimed in claim 2, which is characterized in that the positive area Kong Bo of the positive plate and positive-active
Layer intersection is coated with thermal insulation adhesive tape.
5. lithium ion battery as described in claim 1, which is characterized in that the negative electrode tab includes negative current collector and is coated on
The negative electrode active layer of negative current collector upper and lower surface, the winding end of the negative electrode tab is with one section only the one of the inner septum that reclines
Face does not cover the area cathode Kong Bo of negative electrode active floor.
6. lithium ion battery as claimed in claim 5, which is characterized in that it is outermost that the length in the area the cathode Kong Bo is equal to battery core
The perimeter of circle.
7. lithium ion battery as described in claim 1, which is characterized in that the winding end of the negative electrode tab is longer than positive plate
Winding end.
8. lithium ion battery as claimed in claim 7, which is characterized in that negative electrode tab winding end is longer than the winding end of positive plate
Hold 1~5mm.
9. lithium ion battery as described in claim 1, which is characterized in that the winding start end of the inner septum and outer diaphragm
Winding start end flushes, and the winding start end of the positive plate is located at inner septum and outer membrane winding starting point winding 1.3~1.5
Position after circle.
10. lithium ion battery as described in claim 1, which is characterized in that the outer layer covers of the battery core have cut-off adhesive tape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820622510.6U CN208352451U (en) | 2018-04-27 | 2018-04-27 | A kind of lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820622510.6U CN208352451U (en) | 2018-04-27 | 2018-04-27 | A kind of lithium ion battery |
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| Publication Number | Publication Date |
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| CN208352451U true CN208352451U (en) | 2019-01-08 |
Family
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| CN201820622510.6U Active CN208352451U (en) | 2018-04-27 | 2018-04-27 | A kind of lithium ion battery |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113363595A (en) * | 2021-06-02 | 2021-09-07 | 深圳吉阳智能科技有限公司 | Power lithium ion battery and preparation method thereof |
| CN113517472A (en) * | 2021-03-18 | 2021-10-19 | 河南鑫泉能源科技有限公司 | Alignment method for positive and double-pole ears of cylindrical lithium ion battery |
| WO2022213713A1 (en) * | 2021-04-08 | 2022-10-13 | 江苏时代新能源科技有限公司 | Battery cell, battery, electrical device and method for manufacturing battery cell |
-
2018
- 2018-04-27 CN CN201820622510.6U patent/CN208352451U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113517472A (en) * | 2021-03-18 | 2021-10-19 | 河南鑫泉能源科技有限公司 | Alignment method for positive and double-pole ears of cylindrical lithium ion battery |
| CN113517472B (en) * | 2021-03-18 | 2022-12-23 | 河南鑫泉能源科技有限公司 | Alignment method for positive and double-pole ears of cylindrical lithium ion battery |
| WO2022213713A1 (en) * | 2021-04-08 | 2022-10-13 | 江苏时代新能源科技有限公司 | Battery cell, battery, electrical device and method for manufacturing battery cell |
| CN113363595A (en) * | 2021-06-02 | 2021-09-07 | 深圳吉阳智能科技有限公司 | Power lithium ion battery and preparation method thereof |
| CN113363595B (en) * | 2021-06-02 | 2023-02-21 | 深圳吉阳智能科技有限公司 | Power lithium ion battery and preparation method thereof |
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Address after: 313100, No. 18, Qiao Qiao Road, Changxing County painting industrial park, Zhejiang, Huzhou Patentee after: Tianneng Shuai Fude Energy Co., Ltd Address before: 313100, No. 18, Qiao Qiao Road, Changxing County painting industrial park, Zhejiang, Huzhou Patentee before: Zhejiang energy energy Polytron Technologies Inc |