CN209389153U - A kind of lithium ion battery of winding-structure - Google Patents
A kind of lithium ion battery of winding-structure Download PDFInfo
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- CN209389153U CN209389153U CN201920367550.5U CN201920367550U CN209389153U CN 209389153 U CN209389153 U CN 209389153U CN 201920367550 U CN201920367550 U CN 201920367550U CN 209389153 U CN209389153 U CN 209389153U
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- electrode
- lithium ion
- ion battery
- electrode sheet
- gummed paper
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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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Abstract
Provide a kind of lithium ion battery of winding-structure, the lithium ion battery includes: electrode assembly, including sequential volume around first electrode sheet, second electrode sheet and the diaphragm being placed between first electrode sheet and second electrode sheet, first electrode sheet includes the first coating area for being coated with the first active material and the first blank collector area for being not coated with the first active material, second electrode sheet includes the second coating area for being coated with the second active material and the second blank collector area for being not coated with the second active material, the winding-structure of first electrode sheet and second electrode sheet has the curve shape of bending in the section vertical with its wireline reel, wherein, electrode assembly further includes ion exchange gummed paper, the position of predetermined bending of at least one of the first coating area of first electrode sheet and the second coating area of second electrode is arranged in ion exchange gummed paper Set place.
Description
Technical field
The utility model relates to a kind of lithium ion batteries, in particular, being related to a kind of winding knot with high-energy density
The lithium ion battery of structure.
Background technique
Secondary cell of the lithium ion battery as a kind of environmental protection, in portable device such as mobile phone, video camera, notebook
The fields such as computer are widely applied.However, numerous portable devices are all to intelligent, more with the development of modern society
Functionalization strides forward, and in order to meet its requirement to capacity and power, guarantee its abundance uses the time, it is desirable that its power source is necessary
With higher energy density.But at present can practical lithium ion battery electrochemical system it is substantially stationary, be difficult to meet in a short time
Its energy density further increases.
Current lithium battery enterprise all attempts by improving the coating weight of active material on electrode slice and increasing electrode
The compacted density of piece, the energy density of Lai Tigao battery.However, positive/negative plate is all after coating weight and compacted density become larger
It is faced with technologic technical bottleneck.After coating weight and compacted density become larger, winding process is easy to happen the disconnected of electrode slice
Split and/or the removing of active material, picking phenomenon.
Utility model content
The utility model is to propose in view of the above problems, and its purpose is to provide a kind of energy densities that can be improved
The lithium ion battery of winding-structure.
The exemplary embodiment of the utility model provides a kind of lithium ion battery of winding-structure, the lithium ion battery
Include: electrode assembly, including sequential volume around first electrode sheet, second electrode sheet and be placed in first electrode sheet and second electrode
Diaphragm between piece, first electrode sheet include being coated with the first coating area of the first active material and being not coated with the first active matter
First blank collector area of matter, second electrode sheet include the second coating area coated with the second active material and are not coated with the
The winding-structure of second blank collector area of two active materials, first electrode sheet and second electrode sheet is vertical with its wireline reel
Section in have bending curve shape, wherein electrode assembly further include: ion exchange gummed paper, be arranged in first electrode sheet
The first coating area and second electrode at least one of the second coating area predetermined bending position at.
In the exemplary embodiment, the ion exchange gummed paper can be set in the first coating area of first electrode sheet and second
The first time of at least one of second coating area of electrode bends and is bent at corresponding position for the second time.
In the exemplary embodiment, first electrode sheet can be anode, and second electrode sheet can be cathode.
In the exemplary embodiment, the ion exchange gummed paper can be insulation microcellular structure, the ion exchange gummed paper
Material can at least one of for polypropylene, polyethylene and polyimides, the thickness of the ion exchange gummed paper can for 5~
30um。
In the exemplary embodiment, the side of the ion exchange gummed paper can have viscosity, and the other side can not have viscous
Property.
In the exemplary embodiment, the winding in first electrode sheet and second electrode sheet can be set in the ion exchange gummed paper
The outside of structure.
In the exemplary embodiment, the lithium ion battery can also include: packaging bag, accommodate the electrode assembly；And
Electrolyte is filled in the packaging bag.
In the exemplary embodiment, the first blank collector in one end of first electrode sheet can be set in first electrode tab
Qu Shang, second electrode tab can be set in the second blank collector area of one end of second electrode sheet.
The lithium ion battery that embodiment according to the present utility model provides compared with prior art, by first electrode sheet
The first coating area and/or second electrode sheet the second coating area the corresponding position of predetermined bending at ion exchange glue is set
Paper, can be avoided during winding process there is a phenomenon where electrode slice fracture and/or active material removing, to improve electrode
The coating weight of on piece active material and the compacted density for increasing electrode slice, and the energy for therefore improving lithium ion battery is close
Degree.
Detailed description of the invention
By describing exemplary embodiment in detail with reference to the accompanying drawing, the above and other purpose of the utility model and excellent
Point will become clearer and be readily appreciated that.In the accompanying drawings, unless otherwise stated, the instruction of identical appended drawing reference is identical
Element.In the accompanying drawings:
Fig. 1 shows the exemplary perspective view of lithium ion battery in the prior art；
Fig. 2 shows the exemplary cross-sectional views of lithium ion battery in the prior art；
Fig. 3 shows the exemplary perspective view of the electrode assembly of the lithium ion battery of embodiment according to the present utility model；
Fig. 4 shows the exemplary sectional view of the electrode assembly of the lithium ion battery of embodiment according to the present utility model；
Fig. 5 shows the plan view of the positive plate of the lithium ion battery of embodiment according to the present utility model；
Fig. 6 shows the plan view of the negative electrode tab of the lithium ion battery of embodiment according to the present utility model；
Fig. 7 shows another exemplary perspective of the electrode assembly of the lithium ion battery of embodiment according to the present utility model
Figure.
Specific embodiment
Hereinafter, the embodiments of the present invention be will be described in detail with reference to accompanying drawings.In the accompanying drawings, concise in order to clear
Ground shows main element related with the technical concept of utility model, can exaggerate the shape of element, and can be omitted secondary
Element keeps the technical concept of the utility model fuzzy to avoid description.In the whole instruction attached drawing, identical appended drawing reference begins
Identical element is indicated eventually.
Fig. 1 shows the exemplary perspective view of lithium ion battery in the prior art；Fig. 2 shows lithiums in the prior art
The exemplary cross-sectional view of ion battery.
Referring to Figures 1 and 2, lithium ion battery in the prior art includes electrode assembly 10, accommodates the electrode assembly 10
Packaging bag 20 and the electrolyte that is filled in the packaging bag 20.Packaging bag 20 is metallo-plastic composite membrane.The metal modeling
Material composite membrane includes metal layer and the plastic layer that the layer on surface of metal is arranged in, and the material of the metal layer is aluminium, aluminium alloy
Perhaps the material of the stainless steel plastic layer is polypropylene or polyethylene.
Currently, the method for improving battery energy density is by improving the coating weight of active material and increase on pole piece
The compacted density of pole piece.However, positive/negative plate all suffers from technologic technology bottle after coating weight and compacted density become larger
Neck.For the positive plate of lithium ion battery, collector is usually aluminium foil, after coating weight and compacted density become larger, winding
Process is easy to happen the fracture of positive plate, especially first folding at winding initial stage, the second folding process；For the negative of lithium ion battery
Pole piece, collector are usually copper foil, and after coating weight and compacted density become larger, winding process is easy to happen the stripping of active material
From, generation picking phenomenon, and then cause short-circuit risks.Based on the above reasons, coating weight and compacted density become larger at present, only
It can carry out, the raising of lithium ion battery energy density be helped smaller in limited degree.
In order to solve the above-mentioned technical problem, the utility model provides a kind of lithium-ion electric of winding-structure improved
Pond, the lithium ion battery is by being arranged ion exchange glue at the predetermined corresponding position of bending of the coating area of electrode slice
Paper, can be avoided during winding process there is a phenomenon where electrode slice fracture and/or active material removing, thus improve lithium from
The energy density of sub- battery.The lithium ion battery according to the present utility model with winding-structure is described more fully below.Under
Wen Zhong, unless otherwise instructed, described lithium ion battery are the battery with winding-structure.
Fig. 3 shows the exemplary perspective of the electrode assembly 10 of the lithium ion battery of embodiment according to the present utility model
Figure；Fig. 4 shows the exemplary sectional view of the electrode assembly 10 of the lithium ion battery of embodiment according to the present utility model；Fig. 5
Show the plan view of the positive plate 101 of the lithium ion battery of embodiment according to the present utility model；Fig. 6 is shown according to this reality
With the plan view of the negative electrode tab 102 of the lithium ion battery of novel embodiment.
Referring to Fig. 3 and Fig. 4, electrode assembly 10 is wound by positive plate 101, negative electrode tab 102 and diaphragm 103, and is made
Diaphragm 103 is placed between positive plate 101 and negative electrode tab 102.Positive plate 101 and the winding-structure of negative electrode tab 102 are wound with it
There is the curve shape of bending in the vertical section of axis (referring to fig. 4).
Referring to Fig. 5, positive plate 101 includes 61 He of positive coating area that positive active material is coated on plus plate current-collecting body
It is not coated with the positive blank collector area (also known as " anode is not coated with coating area ") 60 of positive active material.Plus plate current-collecting body
Material is not particularly limited, as long as it does not cause the chemical change in battery and conductive.For example, anode collection
Body is usually Al foil.Positive active material for lithium ion battery can be the lithium transition elements combined oxidation that can be embedded in lithium
Object, for example, LiCoO2、LiMn2O4、LiNi1-xCoxO2(0 < x < 1) etc..Positive pole ear 41 is welded in positive plate one end just
In pole blank collector area 60.Gasket 80 is equipped on positive pole ear 41.
Referring to Fig. 6, negative electrode tab 102 includes that 91 He of cathode coating area of negative electrode active material is coated on negative current collector
It is not coated with the cathode blank collector area (also known as " cathode is not coated with coating area ") 90 of negative electrode active material.Negative current collector
Material is not particularly limited, as long as it does not cause the chemical change in battery and conductive.For example, negative current collector
Usually copper foil.Negative electrode active material can be embedded in various carbon-based materials with deintercalate lithium ions, such as artificial graphite,
Natural graphite and hard carbon etc..Negative lug 71 is welded in the cathode blank collector area 90 of negative electrode tab.In negative lug 71
Equipped with gasket 80.
Referring back to Fig. 4, for diaphragm 103 between positive plate 101 and negative electrode tab 102, main function is that positive and negative anodes are living
Property substance separate, prevent the two poles of the earth short-circuit due to contact；Furthermore in electrochemical reaction, it is able to maintain necessary electrolyte, is formed
The mobile channel of ion.The material of diaphragm 103 may include polyethylene (PE), polypropylene (PP), cellulose membrane, polyimide film
(PI), PA membrane (PA), spandex or aramid fiber film etc..
It should be noted that the cross section of the winding-structure of electrode assembly 10 shown in Fig. 4 have it is run-track shaped, however
The winding-structure shown is only example, and the utility model is without being limited thereto.In another example embodiment, the winding knot of electrode assembly
The cross section of structure can have ellipse or rectangular shape.
In the exemplary embodiment, ion exchange gummed paper 30 can be set in the positive coating area 61 of positive plate 101 extremely
At few one at the corresponding position of bending.For example, can be in the positive coating area 61 of positive plate 101 with smaller radius of curvature
Ion exchange gummed paper 30 is set at position.It in another example embodiment, can be in the pre- of the positive coating area 61 of positive plate 101
Ion exchange gummed paper 30 is set at the fixed corresponding position of bending.Referring to Fig. 4 and Fig. 5, ion exchange gummed paper 30 is arranged in anode
The first time of the positive coating area 61 of piece 101 bends and is bent at corresponding position for the second time.
Positive plate 101 can be improved exist by the way that ion exchange gummed paper 30 is arranged on the positive coating area 61 of positive plate 101
The radius of curvature at structural strength and/or increase crooked place at crooked place, to prevent positive plate during winding process
101 fracture.
In the exemplary embodiment, it can further be bent at least one in the cathode coating area 91 of negative electrode tab 102 pair
Ion exchange gummed paper 30 is set at the position answered.Ion exchange gummed paper 30 is set on the cathode coating area 91 of negative electrode tab 102
Position (referring to Fig. 6) can be essentially identical with the setting position on the positive coating area 61 of positive plate 101, and thereof will be omitted phases
The description of pass.
It can protect negative electrode active material by the way that ion exchange gummed paper 30 is arranged on the cathode coating area 91 of negative electrode tab 102
And/or the radius of curvature at increase crooked place, to prevent the removing of negative electrode active material during winding process, picking existing
As.
Ion exchange gummed paper 30 can be such that ion is connected and can make electronic isolation, that is, have insulation microcellular structure.Root
According to the embodiments of the present invention, the side of ion exchange gummed paper 30 has viscosity, and the other side does not have viscosity, for example, ion
The sticking side of tool of exchange gummed paper 30 can paste in the outside of the winding-structure of first electrode sheet and second electrode sheet.
For example, the material of ion exchange gummed paper can be at least one of polypropylene, polyethylene and polyimides.Ion exchange gummed paper
30 thickness can be 5 μm~30 μm.The numberical range provided herein is merely illustrative, is not intended to limit the model of the utility model
Enclose, relatively thin ion exchange gummed paper can be selected, if can ensure to prevent during winding process the fracture of positive plate 101 and/
Or prevent the removing of negative electrode active material during winding process, picking phenomenon.
In addition, it is necessary to explanation, although described above is in the predetermined of the respective coating area of both positive plate and negative electrode tab
Setting ion exchange gummed paper at the position of (for example, first time bending and second of bending) at the position of secondary bending, but this reality
With novel without being limited thereto.In other words, can only be arranged at the position of predetermined bending of the coating area of positive plate or negative electrode tab
Ion exchange gummed paper.
During winding process, referring to figure 5 and figure 6, there are anodes for 101 both ends of positive plate coated with positive active material
Positive pole ear 41, is welded on the positive blank collector area 60 of positive plate one end by blank collector area 60, and by cathode pole
Ear 71 is welded on the cathode blank collector area 90 of negative electrode tab 102, then respectively the of positive plate and negative electrode tab winding-structure
Primary bending pastes ion exchange gummed paper 30 with corresponding position is bent for the second time, and ion exchange gummed paper 30 is made to be pasted onto winding knot
The outside of structure is to play maximum effect.For example, ion exchange gummed paper 30 can be pasted onto positive plate in advance before winding process
101 and/or negative electrode tab 102 crooked place separate wireline reel position at.
Referring back to Fig. 4, according to positive plate 101, diaphragm 103, negative electrode tab 102 arrangement mode by positive plate, diaphragm and
Negative electrode tab is wound into electrode assembly 10.Positive pole ear 41 and negative lug 71 can be located at the coiling direction head of electrode assembly 10
Portion, to form electrode assembly 10 shown in Fig. 3.
Then, the positive pole ear 41 of electrode assembly 10 after winding is placed in the side at the top of electrode assembly 10, cathode
Tab 71 is placed in the other side at the top of electrode assembly 10, and the gasket 80 on positive pole ear 41 and negative lug 71 is right
Together, electrode assembly 10 is packaged by the gasket 80 on the plastic layer and tab of metallo-plastic composite membrane, such as Fig. 2 institute
Show.
Then, it is melted into and is completed Vacuum Package, fold shaping to the electrode assembly 10 after fluid injection, to form Fig. 1
Shown in lithium ion battery.
It should be noted that, although positive pole ear 41 and negative lug 71 are located at electricity in electrode assembly 10 shown in Fig. 3
The coiling direction head of pole component 10, so that positive pole ear 41 and negative lug 71 are located in winding-structure cross section
Portion.However, example embodiment is without being limited thereto.
Fig. 7 shows the another exemplary of the electrode assembly 10 of the lithium ion battery of embodiment according to the present utility model
View.
Reference Fig. 7, positive pole ear 41 and negative lug 71 can also be located at the coiling direction tail portion of electrode assembly 10, thus
So that positive pole ear 41 and negative lug 71 are located at the side of winding-structure cross section.In addition to electrode assembly 10 shown in Fig. 7
Except, remaining component in lithium ion battery and the component described referring to figs. 1 to Fig. 6 are essentially identical, omit the detailed of them herein
Thin description.
To sum up, according to lithium ion battery provided by the utility model, which passes through in positive plate and negative electrode tab
Winding-structure in be arranged ion exchange gummed paper, can largely improve the coating weight of active material and increase on pole piece
The compacted density of pole piece, and then improve the energy density of lithium ion battery.
Although exemplary embodiment is described herein, the utility model is not limited to above-mentioned embodiment,
But the more broad range of the claim by providing and various apparent modifications are limited with equivalent arrangements.
Claims (9)
1. a kind of lithium ion battery of winding-structure, the lithium ion battery include:
Electrode assembly, including sequential volume around first electrode sheet, second electrode sheet and be placed in first electrode sheet and second electrode
Diaphragm between piece, first electrode sheet include being coated with the first coating area of the first active material and being not coated with the first active matter
First blank collector area of matter, second electrode sheet include the second coating area coated with the second active material and are not coated with the
The winding-structure of second blank collector area of two active materials, first electrode sheet and second electrode sheet is vertical with its wireline reel
Section in have bending curve shape,
It is characterized in that, electrode assembly further include: the first coating area and second of first electrode sheet is arranged in ion exchange gummed paper
At the position of predetermined bending of at least one of the second coating area of electrode.
2. lithium ion battery according to claim 1, which is characterized in that the ion exchange gummed paper is arranged in first electrode
The first time bending and bending for the second time of at least one of first coating area of piece and the second coating area of second electrode are corresponding
Position at.
3. lithium ion battery according to claim 1 or 2, which is characterized in that first electrode sheet is positive plate, second electrode
Piece is negative electrode tab.
4. lithium ion battery according to claim 3, which is characterized in that positive plate is arranged in the ion exchange gummed paper
It the first time bending of first coating area and is bent at corresponding position for the second time and the first time of the second coating area of negative electrode tab
It bends and is bent at corresponding position for the second time.
5. lithium ion battery according to claim 1, which is characterized in that the ion exchange gummed paper is insulation micropore knot
Structure,
Wherein, the material of the ion exchange gummed paper is at least one of polypropylene, polyethylene and polyimides,
Wherein, the ion exchange gummed paper with a thickness of 5 μm~30 μm.
6. lithium ion battery according to claim 1, which is characterized in that the side of the ion exchange gummed paper has viscous
Property, the other side does not have viscosity.
7. lithium ion battery according to claim 1, which is characterized in that the ion exchange gummed paper is arranged in first electrode
The outside of piece and the winding-structure of second electrode sheet.
8. lithium ion battery according to claim 1, which is characterized in that the lithium ion battery further include:
Packaging bag accommodates the electrode assembly；And
Electrolyte is filled in the packaging bag.
9. lithium ion battery according to claim 1, which is characterized in that first electrode sheet is arranged in first electrode tab
In the first blank collector area of one end, the second blank collector area of one end of second electrode sheet is arranged in second electrode tab
On.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920367550.5U CN209389153U (en) | 2019-03-20 | 2019-03-20 | A kind of lithium ion battery of winding-structure |
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|---|---|---|---|
| CN201920367550.5U CN209389153U (en) | 2019-03-20 | 2019-03-20 | A kind of lithium ion battery of winding-structure |
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| CN113097572A (en) * | 2021-03-30 | 2021-07-09 | 宁德新能源科技有限公司 | Electrochemical device and electric equipment thereof |
| WO2021195999A1 (en) * | 2020-03-31 | 2021-10-07 | 宁德新能源科技有限公司 | Cell, battery, and electronic device |
| WO2022199435A1 (en) * | 2021-03-25 | 2022-09-29 | 珠海冠宇电池股份有限公司 | Winding cell and pouch battery |
| CN115315842A (en) * | 2021-03-04 | 2022-11-08 | 宁德新能源科技有限公司 | Wound electrochemical device and electronic apparatus |
| WO2023000290A1 (en) * | 2021-07-23 | 2023-01-26 | 江苏时代新能源科技有限公司 | Electrode assembly, battery cell, battery and electric device |
| WO2023010479A1 (en) * | 2021-08-05 | 2023-02-09 | 宁德时代新能源科技股份有限公司 | Electrode assembly and processing method and apparatus, battery cell, battery, and electrical apparatus |
| CN115799656A (en) * | 2021-09-10 | 2023-03-14 | 宁德时代新能源科技股份有限公司 | Electrode assembly, and battery cell, battery, device and manufacturing method related thereto |
| WO2024031255A1 (en) * | 2022-08-08 | 2024-02-15 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery, and electric device |
| WO2024036507A1 (en) * | 2022-08-17 | 2024-02-22 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| WO2024120492A1 (en) * | 2022-12-08 | 2024-06-13 | 湖北亿纬动力有限公司 | Winding-type positive electrode sheet and preparation method therefor, and winding core |
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| CN113097572A (en) * | 2021-03-30 | 2021-07-09 | 宁德新能源科技有限公司 | Electrochemical device and electric equipment thereof |
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| CN115799656B (en) * | 2021-09-10 | 2023-12-15 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery, device and manufacturing method related to electrode assembly |
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