CN104332589B - Pole piece and preparation method thereof - Google Patents
Pole piece and preparation method thereof Download PDFInfo
- Publication number
- CN104332589B CN104332589B CN201410432632.5A CN201410432632A CN104332589B CN 104332589 B CN104332589 B CN 104332589B CN 201410432632 A CN201410432632 A CN 201410432632A CN 104332589 B CN104332589 B CN 104332589B
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- district
- film layer
- film
- kong
- pole piece
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Cell Electrode Carriers And Collectors (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a kind of pole piece and preparation method thereof.Described pole piece includes current collector foil and the film layer being arranged at least one face of current collector foil, current collector foil has at least two film district of the longitudinal extension along current collector foil and the middle Kong Bo district between adjacent Liang Ge film district and the edge Kong Bo district lateral in whole film district on the corresponding face be provided with film floor, wherein, middle Kong Bo district and edge Kong Bo district are referred to as Kong Bo district, current collector foil is provided with film floor and in Kong Bo district without film floor in film district, wherein, described film layer includes film layer and lower film layer, under identical rolling pressure, in same film district, the elongation of upper film layer is more than the elongation of lower film layer, and after rolling, in same film district, upper film layer and lower film layer have identical width.Described pole piece can improve existing painting film pole piece in nipping process the current collector foil of pole piece at the buckling problems in each film district with longitudinal intersection in adjacent Kong Bo district.
Description
Technical field
The present invention relates to energy storage device field, particularly relate to a kind of pole piece and preparation method thereof.
Background technology
The pole piece preparation process of lithium ion battery, generally include slurrying, film, be dried, roll, the operation such as cutting, although
The manufacturing process of different vendor or different battery may be varied from, but pole piece to roll be all requisite operation.Pole piece
After rolling, reaching certain compacted density, lithium ion battery energy density is being promoted extremely important.
In pole piece preparation process, painting membrane efficiency can be improved by the way of zebra stripes pole piece, save production cost,
And can be according to being actually needed the striped quantity and width changing pole piece.Zebra stripes pole piece uses roller pair structure cold at present
Pressure technology, it may appear that Kong Bo district, edge (foil parts in Ji Fei film district) plays buckling problems, which greatly limits
The development of pole piece preparation technology.
Summary of the invention
In view of problem present in background technology, it is an object of the invention to provide a kind of pole piece and preparation method thereof, its
The existing painting film pole piece current collector foil of pole piece indulging in each film district and adjacent Kong Bo district in nipping process can be improved
To the buckling problems of intersection.
To achieve these goals, in first aspect, the invention provides a kind of pole piece, it include current collector foil and
The film layer being arranged at least one face of current collector foil, current collector foil has edge on the corresponding face be provided with film layer
At least two film district of the longitudinal extension of current collector foil and the middle Kong Bo district between adjacent Liang Ge film district and
In the edge Kong Bo district that whole film district is lateral, wherein, middle Kong Bo district and edge Kong Bo district are referred to as Kong Bo district, collector paper tinsel
Sheet is provided with film floor and in Kong Bo district without film floor in film district, and wherein, described film layer includes film layer and lower film layer, identical
Under rolling pressure, in same film district, the elongation of upper film layer is more than the elongation of lower film layer, and after rolling, with
In one film district, upper film layer and lower film layer have identical width.
To achieve these goals, in second aspect, the invention provides the preparation method of a kind of pole piece, be used for preparing root
According to the pole piece of first aspect present invention, including step: step one: arrange film layer at least one face of current collector foil, collection
Fluid paillon foil have on the corresponding face be provided with film floor at least two film district of the longitudinal extension along current collector foil with
And the middle Kong Bo district between adjacent Liang Ge film district and the edge Kong Bo district lateral in whole film district, wherein, middle
Kong Bo district and edge Kong Bo district are referred to as Kong Bo district, and current collector foil is provided with film floor and in Kong Bo district without film floor in film district,
Wherein, described pole piece film floor in same film district includes film floor and lower film floor, under identical rolling pressure, upper film layer
Elongation more than the elongation of lower film layer；And step 2: carry out drying, roll-in obtains pole piece, and wherein, the pole piece obtained exists
Upper film floor and lower film floor in same film district have identical width.
Beneficial effects of the present invention is as follows:
The film layer of the pole piece of the present invention includes film layer and lower film layer, and in same film district, the elongation of upper film layer is more than
The elongation of lower film layer, upper film layer and lower film layer can be layered in nipping process absorption extension power, so each film district with
Longitudinal intersection in adjacent Kong Bo district, extensible extent reduces to lower film floor from the upper film floor in this film district, thus connects with lower film layer
The current collector foil touched reduces with longitudinal intersection extensible extent in adjacent Kong Bo district in each film district, thus improves pole piece respectively
The buckling problems of film district and longitudinal intersection in adjacent Kong Bo district.
Accompanying drawing explanation
Fig. 1 illustrates schematic diagram during existing pole piece one side film；
Fig. 2 illustrates existing pole piece schematic diagram before and after roll-in, the front view before wherein (a) is roll-in, and (b) is roll-in
After front view, and (c) is the top view after roll-in and illustrates, with heavy line, the amount that current collector foil extends；
Fig. 3 illustrates the schematic diagram before and after roll-in of the pole piece according to the present invention, the front view before wherein (a) is roll-in, (b)
For the front view after roll-in, and (c) is the top view after roll-in and illustrates, with heavy line, the amount that current collector foil extends；
Fig. 4 illustrates another embodiment of the pole piece according to the present invention schematic diagram before and after roll-in, before wherein (a) is roll-in
Front view, (b) is the front view after roll-in, and (c) is the top view after roll-in and illustrates that current collector foil extends with heavy line
Amount；
Wherein, description of reference numerals is as follows:
1 pole piece 12 film layer
Film layer in 11 current collector foil 121
111 122 times, film district film floor
112 middle Kong Bo district L0, L1, L2 extensible extent
113 edge Kong Bo districts
Detailed description of the invention
Describe pole piece according to the present invention and preparation method thereof with reference to the accompanying drawings in detail.
First pole piece according to a first aspect of the present invention is described.
With reference to Fig. 3 and Fig. 4, pole piece according to a first aspect of the present invention includes current collector foil 11 and is arranged at collector
Film layer 12 at least one face of paillon foil 11, current collector foil 11 has along afflux on the corresponding face be provided with film layer 12
At least two film district 111 of the longitudinal extension of body paillon foil 11 and the middle Kong Bo district between adjacent Liang Ge film district 111
112 and the edge Kong Bo district 113 lateral in whole film district 111, wherein, middle Kong Bo district 112 and edge Kong Bo district 113 unite
Be referred to as Kong Bo district, current collector foil 11 be provided with film floor 12 in film district 111 and in Kong Bo district without film floor 12, wherein, described film
Layer 12 includes film layer 121 and lower film layer 122, under identical rolling pressure, in same film district 111, upper film layer 121
Elongation is more than the elongation of lower film layer 122, and after rolling, in same film district 111, and upper film layer 121 and lower film layer
122 have identical width.
The pole piece of the present invention is after roll-in, at longitudinal intersection in each film district 111 with adjacent Kong Bo district, with lower film layer
The current collector foil 11 of 122 contacts (sees figure in each film district 111 with longitudinal intersection extensible extent reduction in adjacent Kong Bo district
(c) of (c) of 3 and Fig. 4).
In existing pole piece, seeing figures.1.and.2, before roll-in, the thickness of the film layer 12 of pole piece is Tm, the film after roll-in
The thickness of layer 12 is Tn, and film floor 12 is caused the current collector foil 11 at film district 111 to extend by rolling pressure, and middle empty paper tinsel
District 112 and edge Kong Bo district 113 are not caused the collector paper tinsel at middle Kong Bo district 112 and edge Kong Bo district 113 by rolling pressure
Sheet 11 does not extends, because the stress of current collector foil 11 concentrates on longitudinal intersection in each film district 111 and adjacent Kong Bo district,
So causing current collector foil 11 serious with the buckling problems of longitudinal intersection in adjacent Kong Bo district in each film district 111.Example
As, in the example shown in Fig. 2, prolonging of the current collector foil 11 longitudinal intersection in each film district 111 and adjacent Kong Bo district
Exhibition amount is L0.
The film layer 12 of the pole piece of the present invention includes film layer 121 and lower film layer 122, in same film district 111, upper film layer
The elongation of 121 is more than the elongation of lower film layer 122, and upper film layer 121 and lower film layer 122 can be layered absorption in nipping process
Extension power, so at longitudinal intersection in each film district 111 with adjacent Kong Bo district, extensible extent is from the upper film in this film district 111
Layer 121 reduces to lower film layer 122, thus the current collector foil 11 contacted with lower film floor 122 is at each film district 111 and adjacent sky
Longitudinal intersection extensible extent in paper tinsel district reduces, thus improves current collector foil 11 in each film district 111 and adjacent Kong Bo district
The buckling problems of longitudinal intersection.Specifically, with reference to Fig. 3 and Fig. 4, current collector foil 11 is at each film district 111 and adjacent sky
The extensible extent of longitudinal intersection in paper tinsel district is respectively L1, L2, and L1 ＜ L0 (with reference to Fig. 3 and Fig. 2), L2 ＜ L0 are (with reference to Fig. 4 and Tu
2), extensible extent reduces, so that the buckling problems of current collector foil 11 is well improved.
In an embodiment of pole piece according to a first aspect of the present invention, with reference to Fig. 4, before pole piece is by roll-in, same
In one film district 111, the width of upper film layer 121 is smaller than the width of lower film layer 122.After roll-in, in each film district 111 with adjacent
Longitudinal intersection in Kong Bo district, extensible extent reduces to lower film floor 122 from the upper film floor 121 in this film district 111, thus with lower film
The current collector foil 11 of floor 122 contact reduces (reference in each film district 111 with longitudinal intersection extensible extent in adjacent Kong Bo district
Fig. 4 and Fig. 2, L2 ＜ L0), thus it is effectively improved the buckling problems of current collector foil 11.
In an embodiment of pole piece according to a first aspect of the present invention, with reference to Fig. 3 and Fig. 4, the lower film layer of each film layer 12
The thickness of 122 is Te, and Te≤80 μm.
In an embodiment of pole piece according to a first aspect of the present invention, with reference to Fig. 4, upper film layer 121 He of each film layer 12
Lower film layer 122 thickness sum is Tm, and the thickness of the lower film layer 122 of each film layer 12 is Te, and upper film layer 121 is positioned at lower film layer 122
Top center, upper film layer 121 and the lower film layer 122 transverse width difference in side are De, and 5mm≤De≤20mm；10μm≤
(Tm-Te)≤30μm。
In an embodiment of pole piece according to a first aspect of the present invention, with reference to Fig. 3 and Fig. 4, the width in middle Kong Bo district 112
Degree is Dc and Dc≤20mm, and the width in edge Kong Bo district 113 is Ded and Ded≤10mm.
In an embodiment of pole piece according to a second aspect of the present invention, current collector foil 11 can be the collection that ductility is relatively low
Fluid paillon foil, such as the current collector foil mixed with Ti.The ductility of current collector foil 11 is the least, and current collector foil 11 spreading resistance is more
High.
In an embodiment of pole piece according to a second aspect of the present invention, the thickness of current collector foil 11 is more than or equal to 4 μ
m.The thickness of current collector foil 11 is the biggest, and current collector foil 11 spreading resistance is the highest.
Next the preparation method of explanation pole piece according to a second aspect of the present invention.
The preparation method of pole piece according to a second aspect of the present invention, for preparing pole piece according to a first aspect of the present invention, is wrapped
Include step: step one: arrange film layer 12 at least one face of current collector foil 11, current collector foil 11 is being provided with film layer
There is at least two film district 111 of the longitudinal extension along current collector foil 11 and in adjacent two paintings on the corresponding face of 12
Middle Kong Bo district 112 between film district 111 and the edge Kong Bo district 113 lateral in whole film district 111, wherein, middle empty
Paper tinsel district 112 and edge Kong Bo district 113 are referred to as Kong Bo district, and current collector foil 11 is provided with film floor 12 and at sky in film district 111
Paper tinsel district is without film floor 12, and wherein, described pole piece film floor 12 in same film district 111 includes film floor 121 and lower film floor 122,
Under identical rolling pressure, the elongation of upper film layer 121 is more than the elongation of lower film layer 122；And step 2: dry
Dry, roll-in obtains pole piece, and wherein, the pole piece obtained upper film floor 121 in same film district 111 and lower film floor 122 have phase
Same width.
Claims (8)
1. a pole piece, including current collector foil (11) and be arranged at current collector foil (11) at least one face on film layer
(12), current collector foil (11) has the longitudinal extension along current collector foil (11) on the corresponding face being provided with film layer (12)
At least two film district (111) and middle Kong Bo district (112) between adjacent Liang Ge film district (111) and whole
The edge Kong Bo district (113) that film district (111) is lateral, wherein, middle Kong Bo district (112) and edge Kong Bo district (113) is referred to as
Kong Bo district, current collector foil (11) is provided with film floor (12) and in Kong Bo district without film floor (12) in film district (111),
It is characterized in that, described film layer (12) includes film layer (121) and lower film layer (122), under identical rolling pressure,
In same film district (111), the elongation of upper film layer (121) is more than the elongation of lower film layer (122), and after rolling,
In same film district (111), upper film layer (121) and lower film layer (122) have identical width.
Pole piece the most according to claim 1, it is characterised in that before pole piece is by roll-in, same film district (111)
In, the width of upper film layer (121) is less than the width of lower film layer (122).
Pole piece the most according to claim 1, it is characterised in that the thickness of the lower film layer (122) of each film layer (12) is Te, and
Te≤80μm。
Pole piece the most according to claim 2, it is characterised in that
The upper film layer (121) of each film layer (12) and lower film layer (122) thickness sum are Tm, the lower film layer (122) of each film layer (12)
Thickness be Te, upper film layer (121) is positioned at the top center of lower film layer (122), and upper film layer (121) and lower film layer (122) are one
The transverse width difference of side is De, and 5mm≤De≤20mm；10μm≤(Tm-Te)≤30μm.
Pole piece the most according to claim 1, it is characterised in that
The width of middle Kong Bo district (112) is Dc and Dc≤20mm, the width of edge Kong Bo district (113) is Ded and Ded≤
10mm。
Pole piece the most according to claim 1, it is characterised in that current collector foil (11) is the current collector foil mixed with Ti.
Pole piece the most according to claim 1, it is characterised in that the thickness of current collector foil (11) is more than or equal to 4 μm.
8. a preparation method for pole piece, for preparation according to the pole piece according to any one of claim 1-7, its feature exists
In, including step:
Step one: arrange film layer (12) at least one face of current collector foil (11), current collector foil (11) is being provided with
Have on the corresponding face of film floor (12) longitudinal extension along current collector foil (11) at least two film district (111) and
Middle Kong Bo district (112) between adjacent Liang Ge film district (111) and in the lateral edge Kong Bo district of whole film district (111)
(113), wherein, middle Kong Bo district (112) and edge Kong Bo district (113) is referred to as Kong Bo district, and current collector foil (11) is at film
District (111) is provided with film floor (12) and in Kong Bo district without film floor (12), wherein, described pole piece is in same film district (111)
Film layer (12) includes film layer (121) and lower film layer (122), and under identical rolling pressure, the elongation of upper film layer (121) is big
Elongation in lower film layer (122)；And
Step 2: carry out drying, roll-in obtains pole piece, wherein, the pole piece obtained in same film district (111), upper film layer
And lower film layer (122) has identical width (121).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410432632.5A CN104332589B (en) | 2014-08-28 | 2014-08-28 | Pole piece and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410432632.5A CN104332589B (en) | 2014-08-28 | 2014-08-28 | Pole piece and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104332589A CN104332589A (en) | 2015-02-04 |
| CN104332589B true CN104332589B (en) | 2016-08-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410432632.5A Active CN104332589B (en) | 2014-08-28 | 2014-08-28 | Pole piece and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104332589B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212380442U (en) * | 2020-05-09 | 2021-01-19 | 比亚迪股份有限公司 | Pole piece, winding type battery cell and battery |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1128455A1 (en) * | 2000-02-22 | 2001-08-29 | Matsushita Electric Industrial Co., Ltd. | Method of manufacturing electrode plates for batteries |
| CN101859885A (en) * | 2009-04-09 | 2010-10-13 | 上海比亚迪有限公司 | Battery pole piece, preparation method thereof and secondary battery comprising the same |
| CN102847859A (en) * | 2012-08-21 | 2013-01-02 | 东莞新能源科技有限公司 | Rolling method of lithium ion battery pole piece |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013054932A (en) * | 2011-09-05 | 2013-03-21 | Toyota Motor Corp | Roll press device of electrode plate for battery |
| JP2013098026A (en) * | 2011-11-01 | 2013-05-20 | Panasonic Corp | Pole plate, manufacturing method thereof, and nonaqueous electrolyte secondary battery |
-
2014
- 2014-08-28 CN CN201410432632.5A patent/CN104332589B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1128455A1 (en) * | 2000-02-22 | 2001-08-29 | Matsushita Electric Industrial Co., Ltd. | Method of manufacturing electrode plates for batteries |
| CN101859885A (en) * | 2009-04-09 | 2010-10-13 | 上海比亚迪有限公司 | Battery pole piece, preparation method thereof and secondary battery comprising the same |
| CN102847859A (en) * | 2012-08-21 | 2013-01-02 | 东莞新能源科技有限公司 | Rolling method of lithium ion battery pole piece |
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| CN104332589A (en) | 2015-02-04 |
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