CN209487601U - A kind of lithium ion battery - Google Patents
A kind of lithium ion battery Download PDFInfo
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- CN209487601U CN209487601U CN201920405731.2U CN201920405731U CN209487601U CN 209487601 U CN209487601 U CN 209487601U CN 201920405731 U CN201920405731 U CN 201920405731U CN 209487601 U CN209487601 U CN 209487601U
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- main body
- negative electrode
- electrode tab
- positive plate
- positive
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Battery Electrode And Active Subsutance (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model provides a kind of lithium ion battery, and including positive plate, negative electrode tab and the diaphragm between the positive and negative plate, in negative lug side, negative electrode tab main body is big compared with positive plate size of main body in width and length direction；In positive pole ear side, negative electrode tab main body is wide compared with positive plate main body in width direction, short compared with positive plate main body in length direction；Anode sizing agent coating and positive pole ear handover region tow sides in positive plate main body are coated with ceramic slurry coating, which covers negative electrode tab body top edge.Lithium ion battery provided by the utility model, length of the positive plate main body in positive pole ear side is long compared with negative electrode tab main body, effectively prevent positive plate to knock angle and pierces through diaphragm, prevents positive plate main body from directly contacting with the graphite in negative electrode tab main body, to be effectively improved battery core thermal runaway, battery core security performance is improved.
Description
Technical field
The utility model relates to field of batteries, and in particular to a kind of lithium ion battery.
Background technique
With greatly developing for electric car, the market demand of power battery is rapidly increased in recent years.Meanwhile with
Country falls off to electric vehicle subsidy dynamics, and the electric vehicle for reaching certain course continuation mileage just can get finance and promote subsidy, to electricity
More stringent requirements are proposed for core energy density, and the following safety problem is also gradually taken seriously.
Since the graphitic conductive on negative current collector is fabulous, when plus plate current-collecting body and graphite contact, it will cause positive and negative
Internal short-circuit occurs for pole piece, so that battery core be caused to explode, so, Ying Jinliang avoids connecing for plus plate current-collecting body and negative current collector
Touching.Current lamination type electric core pole piece is that the length and width dimensions of negative electrode tab main body are all larger than the size of plus plate current-collecting body, the positive and negative electrode
The diaphragm for preventing the graphite contact on plus plate current-collecting body and negative current collector is equipped between collector, and the diaphragm is generally all
It can reserve the bound edge for clad anode collector and negative current collector, but the diaphragm is once the case where shrinking, or
Anode pole piece occurs knocking angle situation, easily puncture diaphragm, then plus plate current-collecting body and negative current collector still have the possibility of contact.
And the problem of to prevent internal short-circuit caused by piercing through diaphragm and thermal runaway occurring, four angles of collector are cut out
It is cut to fillet or chamfering.But the pole piece with chamfering or fillet, in the pole piece manufacturing process, die cutting procedure needs
It is cut out with cutting die, i.e., to the more demanding of die-cutting device.
The utility model is the improvement carried out on the basis of above-mentioned technical problem.
Summary of the invention
For situation the technical issues of being mentioned in background technique, a kind of lithium ion battery, the battery anode slice ceramic slurry
The setting of coating area can prevent plus plate current-collecting body from directly contacting with cathode graphite in the case where diaphragm is shunk, thus
It is effectively improved battery core thermal runaway, improves battery core security performance.
In order to solve the above technical problems, the technical solution adopted in the utility model is:
A kind of lithium ion battery, including positive plate, negative electrode tab and the diaphragm between the positive and negative plate, the anode
Piece includes plus plate current-collecting body and the anode sizing agent coating coated in plus plate current-collecting body surface, and the negative electrode tab includes negative current collector
With the anode sizing agent coating for being coated in negative current collector surface；
The plus plate current-collecting body includes positive plate main body and positive pole ear；The negative current collector include negative electrode tab main body and
Negative lug；
In negative lug side, the negative electrode tab main body is big compared with the plus plate current-collecting body size in width and length direction；
In positive pole ear side, the negative electrode tab main body is wide in the width direction positive plate main body, in the length direction anode
Piece main body is short；
Anode sizing agent coating and positive pole ear handover region tow sides in the positive plate main body are coated with ceramics
Slurry coating, the ceramic slurry coating area cover the negative electrode tab body top edge.
Further, in positive pole ear side, the long 1 ± 0.5mm of the positive plate main body negative electrode tab main body.
Further, the wide 3-4mm of width of the width of the negative electrode tab main body positive plate main body.
Further, the ceramic slurry coating of the positive plate main body and positive pole ear handover region anode sizing agent applies
Layer is thin, and the ceramic slurry coating layer thickness is 3-30 μm；The width of the width of the ceramic slurry coating and the positive plate main body
Degree is consistent, and the length of the ceramic slurry coating is 3-5mm.
Further, the diaphragm is the compound PE diaphragm that dual coating has ceramic slurry coating, coated on the pottery on diaphragm
Porcelain slurry coating with a thickness of 1-10 μm.
Further, the positive plate main body is right angle at two angles of positive pole ear side, at two angles of negative lug side
For fillet.
Further, two angles of the positive pole ear and the positive plate main body joining part are chamfering or rounded structure,
Two angles of the positive pole ear free end face are right-angle structure.
Further, four angles of the negative electrode tab main body are right-angle structure.
Further, two angles of the negative lug and the negative electrode tab main body joining part are chamfering or rounded structure,
Two angles of the negative lug free end face are right-angle structure.
Further, the plus plate current-collecting body is aluminium foil, with a thickness of 10-20 μm；The negative current collector is copper foil, with a thickness of
5-15μm。
Further, ceramic slurry viscosity is 1000-5000mpas, solid content 10-50%, fineness≤3 μm；The pottery
Porcelain wet end furnish is at least one (100 parts) of boehmite or aluminium oxide, magnesia, titanium dioxide, silica, binder
(5-20 parts), solvent (200-300 parts), wherein the binder be one of PVDF, CMC, polyacrylate and SBR or
Several, the solvent is N-methyl pyrrolidones (NMP), deionized water, methyl ethyl ketone, one or more of isopropanol.
The utility model the beneficial effects are as follows: (1) the utility model positive plate main body positive pole ear side length
Degree is long compared with negative electrode tab main body, and the battery anode slice main body is equipped with ceramic slurry coating area, the ceramic slurry coating area
For transitional region, it can be shunk in diaphragm or in the case of positive plate knocks angle, prevent plus plate current-collecting body and cathode graphite direct
Contact improves battery core security performance to be effectively improved battery core thermal runaway；(2) diaphragm is two-sided is equipped with ceramic slurry coating, can mention
The heat dissipation performance of high battery core, and improve the insulation performance of the diaphragm；(3) battery is in positive pole ear side, because of ceramic slurry coating
The presence in region will not be shorted collector has pierced through diaphragm, it is therefore not necessary to again with die-cutting device to positive pole ear side
Positive plate main body and negative electrode tab main body carry out the cross cutting of chamfering or fillet, reduce the requirement to die-cutting device, improve production effect
Rate.
Detailed description of the invention
Fig. 1 is the overall structure diagram of lithium ion battery；
Fig. 2 is the structural schematic diagram of lithium ionic cell positive pole ear side；
Fig. 3 is the structural schematic diagram of lithium ionic cell cathode ear pole side；
In figure: 1- diaphragm, 2- positive plate, 21- positive plate main body, 22- positive pole ear, 23- ceramic slurry coating, 3- cathode
Piece, 31- negative electrode tab main body, 32- negative lug.
Specific embodiment
It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can
To be combined with each other.
In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of describing the present invention and simplifying the description, rather than indicate
Or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot understand
For limitations of the present invention.In addition, term " first ", " second " etc. are used for description purposes only, and should not be understood as indicating
Or it implies relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " second " etc. are defined as a result,
Feature can explicitly or implicitly include one or more of the features.It is in the description of the present invention, unless another
It is described, the meaning of " plurality " is two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, on being understood by concrete condition
State the concrete meaning of term in the present invention.
The utility model will be described in detail below with reference to the accompanying drawings and embodiments.
Embodiment 1
A kind of lithium ion battery, including positive plate, negative electrode tab and the diaphragm between the positive and negative plate, the anode
Piece includes plus plate current-collecting body and the anode sizing agent coating coated in plus plate current-collecting body surface, and the negative electrode tab includes negative current collector
With the anode sizing agent coating for being coated in negative current collector surface；
The plus plate current-collecting body includes positive plate main body and positive pole ear；The negative current collector include negative electrode tab main body and
Negative lug；
In negative lug side, the negative electrode tab main body is big compared with the plus plate current-collecting body size in width and length direction；
In positive pole ear side, the negative electrode tab main body is wide in the width direction positive plate main body, in the length direction anode
Piece main body is short；
Anode sizing agent coating and positive pole ear handover region tow sides in the positive plate main body are coated with ceramics
Slurry coating, the ceramic slurry coating area cover the negative electrode tab body top edge.
Wherein, in positive pole ear side, the long 1 ± 0.5mm of the positive plate main body negative electrode tab main body.
Wherein, the wide 3-4mm of width of the width of the negative electrode tab main body positive plate main body.
Wherein, the ceramic slurry coating anode sizing agent coating of the positive plate main body and positive pole ear handover region
Thin, the ceramic slurry coating layer thickness is 3-30 μm；The width of the width of the ceramic slurry coating and the positive plate main body
Unanimously, the length of the ceramic slurry coating is 3-5mm.
Wherein, the diaphragm is the compound PE diaphragm that dual coating has ceramic slurry coating, coated on the ceramics on diaphragm
Slurry coating with a thickness of 1-10 μm.
Wherein, the positive plate main body is right angle at two angles of positive pole ear side, is at two angles of negative lug side
Fillet.
Wherein, two angles of the positive pole ear and the positive plate main body joining part are chamfering or rounded structure, institute
Two angles for stating positive pole ear free end face are right-angle structure.
Wherein, four angles of the negative electrode tab main body are right-angle structure.
Wherein, two angles of the negative lug and the negative electrode tab main body joining part are chamfering or rounded structure, institute
Two angles for stating negative lug free end face are right-angle structure.
Wherein, the plus plate current-collecting body is aluminium foil, with a thickness of 10-20 μm；The negative current collector is copper foil, with a thickness of 5-
15μm。
Embodiment 2
In embodiment 1 ceramic slurry ceramic slurry viscosity be 1000-5000mpas, solid content 10-50%, fineness≤
3μm；The ceramic slurry proportion is at least one (100 of boehmite or aluminium oxide, magnesia, titanium dioxide, silica
Part), binder (5-20 parts), solvent (200-300 parts), wherein the binder is PVDF, CMC, polyacrylate and SBR
One or more of, the solvent is N-methyl pyrrolidones (NMP), deionized water, methyl ethyl ketone, one in isopropanol
Kind is several.
Embodiment 3
The preparation process of lithium ion battery is as follows:
(1) prepared by ceramic slurry: taking 100 parts of boehmite, 10 parts of PVDF, 250 parts of NMP, high speed dispersion is uniform.
(2) production of positive plate: positive pole volume is die cut, wherein two angles of the positive plate main body in positive pole ear side
For right angle, other two angle is fillet.
(3) positive plate coats: the anode sizing agent prepared in advance and ceramic slurry are coated uniformly on 15 μm of aluminium foils respectively
On, the wherein equivalent width of single side ceramic slurry coating widths and positive plate main body, the length is 3 μm, with a thickness of 5 μm, single side
Anode sizing agent coating layer thickness is 40 μm.
(4) positive plate that step (3) are dried such as is rolled, is die cut at the processes, wherein positive pole ear and positive plate main body
Two angles to connect are fillet, and two angles of positive pole ear free end face are right angle.
(5) production of negative electrode tab: cathode pole volume is die cut, wherein four angles of negative electrode tab main body are right-angle structure.
(6) coating of negative electrode tab: the negative electrode slurry prepared in advance is coated uniformly on 10 μm of copper foils, single side cathode slurry
Expect that coating layer thickness is 40 μm.
(7) positive plate that step (6) are dried such as is rolled, is die cut at the processes, wherein negative lug and negative electrode tab main body
Two angles to connect are fillet, and two angles of negative lug free end face are right angle.
(8) production of compound PE diaphragm: in two side coated ceramic slurries of PE diaphragm, the thickness of the ceramic slurry coating
It is 5 μm.
(9) positive plate, diaphragm, negative electrode tab lamination: are subjected to lamination.
(10) the core packet folded welded, encapsulated, fluid injection, high temperature is melted into advance, high temperature is aged, room temperature aging, partial volume
Etc. processes, complete battery core production.
One embodiment of the utility model is described in detail above, but the content is only the utility model
Preferred embodiment should not be considered as limiting the scope of the present invention.It is all to be made according to application scope of the utility model
All the changes and improvements etc., should still belong within the patent covering scope of the utility model.
Claims (10)
1. a kind of lithium ion battery, which is characterized in that including positive plate, negative electrode tab and the diaphragm between the positive and negative plate,
The positive plate includes plus plate current-collecting body and the anode sizing agent coating coated in plus plate current-collecting body surface, and the negative electrode tab includes negative
Pole collector and anode sizing agent coating coated in negative current collector surface；
The plus plate current-collecting body includes positive plate main body and positive pole ear；The negative current collector includes negative electrode tab main body and cathode
Tab；
In negative lug side, the negative electrode tab main body is big compared with the plus plate current-collecting body size in width and length direction；Just
Pole tab side, the negative electrode tab main body is wide in the width direction positive plate main body, in the length direction positive plate master
Body is short；
Anode sizing agent coating and positive pole ear handover region tow sides in the positive plate main body are coated with ceramic slurry
Coating, the ceramic slurry coating area cover the negative electrode tab body top edge.
2. a kind of lithium ion battery according to claim 1, which is characterized in that in positive pole ear side, the positive plate master
Long 1 ± the 0.5mm of the body negative electrode tab main body.
3. a kind of lithium ion battery according to claim 1, which is characterized in that the width of the negative electrode tab main body is relatively described
The wide 3-4mm of the width of positive plate main body.
4. a kind of lithium ion battery according to claim 1, which is characterized in that the positive plate main body and positive pole ear are handed over
The ceramic slurry coating anode sizing agent coating for connecing region is thin, and the ceramic slurry coating layer thickness is 3-30 μm；The pottery
The equivalent width of the width of porcelain slurry coating and the positive plate main body, the length of the ceramic slurry coating are 3-5mm.
5. a kind of lithium ion battery according to claim 1, which is characterized in that the diaphragm is that dual coating has ceramic slurry
The compound PE diaphragm for expecting coating, coated on the ceramic slurry coating on diaphragm with a thickness of 1-10 μm.
6. a kind of lithium ion battery according to claim 1, which is characterized in that the positive plate main body is in positive pole ear side
Two angles be right angle, negative lug side two angles be fillet.
7. a kind of lithium ion battery according to claim 6, which is characterized in that the positive pole ear and the positive plate master
Two angles of body joining part are chamfering or rounded structure, and two angles of the positive pole ear free end face are right-angle structure.
8. a kind of lithium ion battery according to claim 1, which is characterized in that four angles of the negative electrode tab main body are
Right-angle structure.
9. a kind of lithium ion battery according to claim 8, which is characterized in that the negative lug and the negative electrode tab master
Two angles of body joining part are chamfering or rounded structure, and two angles of the negative lug free end face are right-angle structure.
10. a kind of lithium ion battery according to claim 1, which is characterized in that the plus plate current-collecting body is aluminium foil, thickness
It is 10-20 μm；The negative current collector is copper foil, with a thickness of 5-15 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920405731.2U CN209487601U (en) | 2019-03-26 | 2019-03-26 | A kind of lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920405731.2U CN209487601U (en) | 2019-03-26 | 2019-03-26 | A kind of lithium ion battery |
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| Publication Number | Publication Date |
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| CN209487601U true CN209487601U (en) | 2019-10-11 |
Family
ID=68134878
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| CN201920405731.2U Active CN209487601U (en) | 2019-03-26 | 2019-03-26 | A kind of lithium ion battery |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111564637A (en) * | 2020-05-19 | 2020-08-21 | 江苏塔菲尔新能源科技股份有限公司 | Pole piece, preparation method thereof and lithium ion battery |
| CN112397716A (en) * | 2020-07-31 | 2021-02-23 | 湖北亿纬动力有限公司 | Oily ceramic slurry, preparation method thereof, positive plate coated with slurry and lithium ion battery |
| CN113871572A (en) * | 2021-09-29 | 2021-12-31 | 珠海冠宇电池股份有限公司 | Positive plate and lithium ion battery |
| CN114421098A (en) * | 2021-12-02 | 2022-04-29 | 万向一二三股份公司 | Improve torn electric core lamination structure of utmost point ear ceramic coating positive plate |
| CN114551808A (en) * | 2022-02-24 | 2022-05-27 | 上海兰钧新能源科技有限公司 | Lithium battery pole piece, lithium battery cell and preparation method of lithium battery pole piece |
| CN114597332A (en) * | 2021-12-02 | 2022-06-07 | 万向一二三股份公司 | High-energy-density pole piece structure for increasing tensile strength of pole piece |
-
2019
- 2019-03-26 CN CN201920405731.2U patent/CN209487601U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111564637A (en) * | 2020-05-19 | 2020-08-21 | 江苏塔菲尔新能源科技股份有限公司 | Pole piece, preparation method thereof and lithium ion battery |
| CN112397716A (en) * | 2020-07-31 | 2021-02-23 | 湖北亿纬动力有限公司 | Oily ceramic slurry, preparation method thereof, positive plate coated with slurry and lithium ion battery |
| CN113871572A (en) * | 2021-09-29 | 2021-12-31 | 珠海冠宇电池股份有限公司 | Positive plate and lithium ion battery |
| CN114421098A (en) * | 2021-12-02 | 2022-04-29 | 万向一二三股份公司 | Improve torn electric core lamination structure of utmost point ear ceramic coating positive plate |
| CN114597332A (en) * | 2021-12-02 | 2022-06-07 | 万向一二三股份公司 | High-energy-density pole piece structure for increasing tensile strength of pole piece |
| CN114551808A (en) * | 2022-02-24 | 2022-05-27 | 上海兰钧新能源科技有限公司 | Lithium battery pole piece, lithium battery cell and preparation method of lithium battery pole piece |
| CN114551808B (en) * | 2022-02-24 | 2024-05-03 | 上海兰钧新能源科技有限公司 | Lithium battery pole piece, lithium battery cell and preparation method of lithium battery pole piece |
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