CN210245613U - Low internal resistance lithium ion battery - Google Patents
Low internal resistance lithium ion battery Download PDFInfo
- Publication number
- CN210245613U CN210245613U CN201921762658.0U CN201921762658U CN210245613U CN 210245613 U CN210245613 U CN 210245613U CN 201921762658 U CN201921762658 U CN 201921762658U CN 210245613 U CN210245613 U CN 210245613U
- Authority
- CN
- China
- Prior art keywords
- coating
- lithium
- positive
- lithium ion
- ion battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
Landscapes
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The utility model discloses a low internal resistance lithium ion battery, include and stack the electric core that the coiling formed in proper order by positive plate, diaphragm and negative pole piece, the surface coating of one side at least of diaphragm has ceramic coating, the both sides surface of positive plate has all coated positive pole graphite layer, the surface coating on the positive pole graphite layer of positive plate both sides has positive pole material coating, the surface coating on the positive pole material coating of positive plate one side or both sides has conductive ceramic layer, conductive ceramic layer's surface coating has first polymer glue film, the surface coating of negative pole piece has negative pole graphite layer, the surface coating on the negative pole graphite layer of negative pole piece one side or both sides has second polymer glue film. By coating the positive graphite layer and the conductive ceramic layer on the positive plate, the lithium ion transfer capacity is improved, the positive active material in the lithium battery and the conductivity between the positive active material and the positive current collector are improved, the lithium storage space of the positive electrode is increased, and the cycle performance of the lithium battery is improved.
Description
Technical Field
The utility model relates to a lithium battery diaphragm technical field, concretely relates to low internal resistance lithium ion battery.
Background
Lithium ion batteries have been widely used in consumer electronics, electric tools, electric vehicles, and other industries, and have the advantages of high operating voltage, high energy density, long cycle life, high power, environmental friendliness, and the like. As lithium ion batteries become more widely used, they are challenged by higher energy density and higher safety performance. The diaphragm is one of the important raw materials of the lithium ion battery, and indexes such as thickness, heat resistance, mechanical strength and porosity of the diaphragm have important influence on energy density, safety performance, internal resistance, functions and the like of the battery.
The traditional PE diaphragm and the PP diaphragm are high in heat shrinkage rate and weak in affinity with electrolyte, the reserved size of the diaphragm is large in battery design, the volume energy density is small, once thermal runaway occurs, the temperature of the battery can rise rapidly, and the safety performance of the lithium ion battery faces challenges. At present, a ceramic layer is coated on the surface of a polyolefin diaphragm to increase the thermal stability of the diaphragm, and because the bonding force between the ceramic coating and a pole piece is weak, in order to improve the bonding force between the diaphragm and the pole piece, a polymer adhesive layer needs to be coated on the surface of the ceramic coating or the surface of a base film, wherein the polymer is PVDF or PMMA or a copolymer thereof, but the polymer adhesive layer causes the ventilation loss of the diaphragm and is not beneficial to the lithium ion conduction; when the polymer is coated on the diaphragm, the coating process requirement is high due to the thin thickness of the diaphragm, the coating process is complex and difficult to control, and when the diaphragm coated by the polymer adhesive layer and the pole piece are wound into a battery cell, phenomena such as dislocation of the pole ear, poor Hi-pot and the like are easy to occur; most of the lithium ion battery anode materials mainly comprise cobalt acids, lithium iron phosphate and the like, wherein the resources such as Ni, Go and the like are limited, the lithium iron phosphate is good in safety, but poor in conductivity and low in rate capability, so that the electric automobile is difficult to charge and discharge at low temperature, and the cycle service life of the electric automobile is shortened.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the disappearance that prior art exists, provide a low internal resistance lithium ion battery, its coating process that can simplify the polymer glue film improves pole piece and diaphragm's adhesion force, avoids electric core coiling in-process appearance utmost point ear dislocation, Hi-pot phenomenon such as bad, reduces the lithium cell internal resistance simultaneously, improves electric conductive property, improves the circulation life of lithium cell.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a low internal resistance lithium ion battery, includes and stacks the electric core that the coiling formed in proper order by positive plate, diaphragm and negative plate, the surface coating of at least one side of diaphragm has ceramic coating, the both sides surface of positive plate has all coated positive electrode graphite layer, the surface coating on the positive electrode graphite layer of positive plate both sides has positive electrode material coating, the surface coating of the positive electrode material coating of positive plate one side or both sides has conductive ceramic layer, conductive ceramic layer's surface coating has first polymer glue film, the surface coating of negative plate has negative pole graphite layer, the surface coating on the negative pole graphite layer of negative plate one side or both sides has second polymer glue film.
As a preferred scheme, the positive plate is an aluminum foil, the positive material coating is one of a lithium nickelate coating, a lithium cobaltate coating, a lithium manganate coating, a lithium iron phosphate coating or a ternary material coating, and the ternary material coating is a nickel-cobalt-manganese mixed coating.
As a preferred scheme, the conductive ceramic layer is a lithium lanthanum zirconium oxide coating, a lithium titanium aluminum phosphate coating or an aluminum lithium germanium phosphorus coating, and the coating thickness of the conductive ceramic layer is 3-6 μm.
Preferably, the coating thickness of the positive graphite layer is 5-20 μm.
Preferably, the negative electrode sheet is a copper foil.
As a preferable scheme, the first polymer adhesive layer is one of a PVDF coating, a PMMA coating, a PVDF copolymer coating or a PMMA copolymer coating, and the coating thickness of the first polymer adhesive layer is 2 to 20 μm.
As a preferable scheme, the second polymer adhesive layer is one of a PVDF coating, a PMMA coating, a PVDF copolymer coating or a PMMA copolymer coating, and the coating thickness of the second polymer adhesive layer is 2 to 20 μm.
Preferably, one side of the separator is coated with a ceramic coating, and the ceramic coating is coated on the side of the separator facing the positive plate.
As a preferable mode, the separator is a polyolefin-based film.
Compared with the prior art, the utility model has obvious advantages and beneficial effects, specifically speaking, 1, through coating the polymer glue film to positive plate or negative plate, simplified the coating technology, the coating is more even, makes the cohesive force between pole piece and the diaphragm better, has also avoided phenomenon such as utmost point ear dislocation, Hi-pot harmfulness that appear in the electric core coiling process, has also reduced the ventilative loss of diaphragm simultaneously, is more favorable to the lithium ion conduction, improves lithium ion battery's cyclicity ability and security performance; 2. the positive plate is coated with the conductive ceramic layer, and the specific surface area and the conductivity of the conductive ceramic are large, so that the lithium ion transfer capacity is improved, the ionic conductivity is improved, the lithium ion transfer distribution is more uniform, the lithium ion loss caused by the formation of lithium dendrites is reduced, the interface stability between an electrolyte and the positive plate can be improved, and the cycle performance of the lithium ion battery is improved; 3. through the anodal graphite layer of surface coating at positive plate, increased anodal active material in the lithium cell and the electric conductivity between anodal active material and the anodal mass flow body, increased anodal storage lithium space, improved lithium cell cycle performance, anodal material electric conductivity increases, can improve the local explosion or the phenomenons such as catching fire that arouse because of the short circuit of lithium cell to a certain extent when receiving external striking, has improved the stability and the security of lithium cell.
To more clearly illustrate the structural features and technical means of the present invention and the specific objects and functions achieved thereby, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments:
drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
the attached drawings indicate the following:
10. a positive plate; 11. a positive graphite layer; 12. coating of a positive electrode material; 13. a conductive ceramic layer; 14. a first polymer glue layer; 20. a diaphragm; 21. a ceramic coating; 30. a negative plate; 31; a negative graphite layer; 32. a second polymer glue layer.
Detailed Description
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the indicated position or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.
As shown in fig. 1, a low internal resistance lithium ion battery includes a battery core formed by sequentially stacking and winding a positive plate 10, a diaphragm 20 and a negative plate 30, wherein a ceramic coating 21 is coated on the surface of one side of the diaphragm 20 facing the positive plate 10, positive graphite layers 11 are coated on the surfaces of both sides of the positive plate 10, a positive material coating 12 is coated on the surface of the positive graphite layers 11 on both sides of the positive plate 10, a conductive ceramic layer 13 is coated on the surface of the positive material coating 12 facing one side of the diaphragm 20, a first polymer adhesive layer 14 is coated on the surface of the conductive ceramic layer 13, a negative graphite layer 31 is coated on the surface of the negative plate 30, and a second polymer adhesive layer 32 is coated on the surface of the negative graphite layer 31 on one side of the negative plate 30 facing the diaphragm 20.
In the present invention, the diaphragm 20 is a polyolefin base film. The positive plate 10 is an aluminum foil, the positive material coating 12 is one of a lithium nickelate coating, a lithium cobaltate coating, a lithium manganate coating, a lithium iron phosphate coating or a ternary material coating, and the ternary material coating is a nickel-cobalt-manganese mixed coating. The conductive ceramic layer 13 is a lithium lanthanum zirconium oxide coating, a lithium titanium aluminum phosphate coating or an aluminum lithium germanium phosphorus coating, the coating thickness of the conductive ceramic layer 13 is 3-6 μm, and the coating thickness of the positive electrode graphite layer 11 is 5-20 μm. The first polymer adhesive layer 14 is one of a PVDF coating, a PMMA coating, a PVDF copolymer coating or a PMMA copolymer coating, and the coating thickness of the first polymer adhesive layer 14 is 2-20 mu m. The negative plate 30 is a copper foil, the second polymer adhesive layer 32 is one of a PVDF coating, a PMMA coating, a PVDF copolymer coating or a PMMA copolymer coating, and the coating thickness of the second polymer adhesive layer 32 is 2-20 μm.
In the utility model, the positive electrode graphite layer 11 is a modified graphite layer coated with one layer of amorphous carbon on the surface of natural or artificial graphite. The conductive ceramic layer 13 may also be a mixed coating of lithium lanthanum zirconium oxide, lithium titanium aluminum phosphate or aluminum lithium germanium phosphorus. The ceramic coating 21 may be applied to both sides of the diaphragm 20 according to actual needs.
It should be noted that, in the present invention, the conductive ceramic layer 13 may also be coated on the surfaces of the anode material coatings 12 on both sides of the anode plate 10; a second polymer glue layer 32 may also be applied to the surface of the negative electrode graphite layer 31 on both sides of the negative electrode sheet 30.
To sum up, the utility model discloses a coating polymer glue film has simplified coating process on positive plate 10 or negative plate 30, and the coating is more even for the cohesive force between pole piece and diaphragm 20 is better, has also avoided phenomenons such as utmost point ear dislocation, Hi-pot harmfulness that appear in the electric core coiling process, has also reduced the ventilation loss of diaphragm 20 simultaneously, more is favorable to the lithium ion conduction, improves lithium ion battery's cyclicity ability and security performance; by coating the conductive ceramic layer 13 on the positive plate 10, the specific surface area and the conductivity of the conductive ceramic are large, so that the lithium ion transfer capacity is improved, the ionic conductivity is improved, the lithium ion transfer distribution is more uniform, the lithium ion loss caused by the formation of lithium dendrites is reduced, the interface stability between an electrolyte and a pole piece can be improved, and the cycle performance of a lithium ion battery is improved; through the anodal graphite layer 11 of surface coating at positive plate 10, increased the anodal active material in the lithium cell and anodal active material and the anodal electric conductivity between the mass flow body, increased anodal lithium space of storing up, improved lithium cell cycle performance, anodal material electric conductivity increases, can improve the local explosion or the phenomenon such as catching fire that arouse because of the short circuit of lithium cell to a certain extent when receiving external striking, improved the stability and the security of lithium cell.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, so any modifications, equivalent replacements, improvements, etc. made to the above embodiments by the technology of the present invention are all within the scope of the technical solution of the present invention.
Claims (9)
1. A low internal resistance lithium ion battery is characterized in that: include and stack the electric core of coiling formation in proper order by positive plate, diaphragm and negative pole piece, the surface coating of one side at least of diaphragm has ceramic coating, the both sides surface of positive plate has all coated anodal graphite layer, the surface coating on the anodal graphite layer of positive plate both sides has anodal material coating, the surface coating on the anodal material coating of positive plate one side or both sides has conductive ceramic layer, conductive ceramic layer's surface coating has first polymer glue film, the surface coating of negative pole piece has negative pole graphite layer, the surface coating on the negative pole graphite layer of negative pole piece one side or both sides has second polymer glue film.
2. The lithium ion battery with low internal resistance according to claim 1, characterized in that: the positive plate is an aluminum foil, and the positive material coating is one of a lithium nickelate coating, a lithium cobaltate coating, a lithium manganate coating, a lithium iron phosphate coating or a ternary material coating.
3. The lithium ion battery with low internal resistance according to claim 1, characterized in that: the conductive ceramic layer is a lithium lanthanum zirconium oxide coating, a titanium aluminum lithium phosphate coating or an aluminum lithium germanium phosphorus coating, and the coating thickness of the conductive ceramic layer is 3-6 mu m.
4. The lithium ion battery with low internal resistance according to claim 1, characterized in that: the coating thickness of the positive graphite layer is 5-20 mu m.
5. The lithium ion battery with low internal resistance according to claim 1, characterized in that: the negative plate is a copper foil.
6. The lithium ion battery with low internal resistance according to claim 1, characterized in that: the first polymer adhesive layer is one of a PVDF coating, a PMMA coating, a PVDF copolymer coating or a PMMA copolymer coating, and the coating thickness of the first polymer adhesive layer is 2-20 mu m.
7. The lithium ion battery with low internal resistance according to claim 1, characterized in that: the second polymer adhesive layer is one of a PVDF coating, a PMMA coating, a PVDF copolymer coating or a PMMA copolymer coating, and the coating thickness of the second polymer adhesive layer is 2-20 mu m.
8. The lithium ion battery with low internal resistance according to claim 1, characterized in that: and one side of the diaphragm is coated with a ceramic coating, and the ceramic coating is coated on the side, facing the positive plate, of the diaphragm.
9. The lithium ion battery with low internal resistance according to claim 1 or 8, characterized in that: the diaphragm is a polyolefin-based film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921762658.0U CN210245613U (en) | 2019-10-19 | 2019-10-19 | Low internal resistance lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921762658.0U CN210245613U (en) | 2019-10-19 | 2019-10-19 | Low internal resistance lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210245613U true CN210245613U (en) | 2020-04-03 |
Family
ID=69965932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921762658.0U Active CN210245613U (en) | 2019-10-19 | 2019-10-19 | Low internal resistance lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210245613U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112864393A (en) * | 2021-02-27 | 2021-05-28 | 李伯虎 | Low-temperature high-rate lithium ion battery |
| CN112952293A (en) * | 2021-01-29 | 2021-06-11 | 枣阳市格芯电子科技有限公司 | Explosion-proof low-internal-resistance lithium ion battery and preparation method thereof |
-
2019
- 2019-10-19 CN CN201921762658.0U patent/CN210245613U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112952293A (en) * | 2021-01-29 | 2021-06-11 | 枣阳市格芯电子科技有限公司 | Explosion-proof low-internal-resistance lithium ion battery and preparation method thereof |
| CN112952293B (en) * | 2021-01-29 | 2023-09-05 | 枣阳市格芯电子科技有限公司 | Explosion-proof low-internal-resistance lithium ion battery and preparation method thereof |
| CN112864393A (en) * | 2021-02-27 | 2021-05-28 | 李伯虎 | Low-temperature high-rate lithium ion battery |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106229447A (en) | A kind of lithium ion battery | |
| KR101753023B1 (en) | Nonaqueous electrolyte secondary battery | |
| US20140162109A1 (en) | Secondary battery | |
| CN102856530A (en) | Lithium ion battery | |
| CN202333014U (en) | Combined diaphragm for battery and battery applying same | |
| CN210245613U (en) | Low internal resistance lithium ion battery | |
| CN113066959B (en) | Battery cell | |
| CN210429959U (en) | Long-life lithium ion battery | |
| CN113794035A (en) | Lithium ion battery diaphragm and lithium ion battery thereof | |
| CN112072109A (en) | Lithium ion battery and preparation method thereof | |
| CN113675401A (en) | Laminated lithium ion battery and negative pole piece thereof | |
| CN217507394U (en) | Pole piece, electric core and battery | |
| CN207217643U (en) | A kind of lithium ion battery is flexible coupling with conduction and lithium ion battery | |
| CN115461909A (en) | Electrochemical device and electronic device comprising same | |
| CN201673968U (en) | Miniature polymer lithium ion battery with dissymmetrical assembly structure | |
| CN105103363A (en) | Non-aqueous electrolyte secondary battery | |
| CN210272570U (en) | High-adhesion lithium ion battery | |
| CN204991877U (en) | Multipolar ear lithium ion power batteries | |
| CN210272569U (en) | High-rate lithium ion battery | |
| CN205680731U (en) | A kind of high safe lithium ion battery | |
| CN109314277B (en) | Nonaqueous electrolyte secondary battery | |
| CN115832183A (en) | Positive electrode plate and preparation method thereof, secondary battery, battery module, battery pack and electric device | |
| CN210926206U (en) | Lithium ion battery capable of meeting low-temperature charging | |
| CN211605334U (en) | High-safety cylindrical lithium ion battery | |
| CN202695643U (en) | Lithium-ion battery rolling core structure battery cell and lithium-ion battery thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |