CN204441383U - The button-shaped LiFePO4 chargeable lithium cell of a kind of high power capacity - Google Patents
The button-shaped LiFePO4 chargeable lithium cell of a kind of high power capacity Download PDFInfo
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- CN204441383U CN204441383U CN201520117958.9U CN201520117958U CN204441383U CN 204441383 U CN204441383 U CN 204441383U CN 201520117958 U CN201520117958 U CN 201520117958U CN 204441383 U CN204441383 U CN 204441383U
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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
Abstract
The button-shaped LiFePO4 chargeable lithium cell of a kind of high power capacity, barrier film is provided with negative plate, barrier film has positive plate, negative plate is provided with negative pole housing, the external circle of negative electrode casing is provided with sealing ring, positive plate has positive pole housing, the external circle of anode cover encases sealing ring by extruding, the external astragal of described negative electrode casing has coupler body, positive plate is disc die-cut electrode formed by three-dimensional conductive skeleton active material, positive plate three-dimensional conductive skeleton used is the nickel foam with through-hole structure, positive plate nickel foam conducting matrix grain surface-coated used has can the protective finish of electron conduction.The utility model stabilizes collector use under high voltages, thus the battery of this structure is on the actual application, the energy density of battery is promoted by the utilance improving the battery useful space, more effectively play the electro-chemical activity of the active material of battery, improve its effective rate of utilization, thus battery capacity is significantly promoted.
Description
Technical field
The present invention relates to field of lithium ion battery, particularly relate to the button-shaped LiFePO4 chargeable lithium cell of a kind of high power capacity.
Background technology
At present along with market is for the improving constantly of performance requirement of lithium ion battery, user requires that the energy density of lithium ion battery is higher, and each button chargeable lithium ion battery manufacturing firm, for above customer requirement, constantly carries out technological improvement.In today that battery raw material reaches its maturity, the method improving fastening lithium ionic cell energy density and chemical property how to reduce the invalid space of battery, increases the loading of active material (positive and negative pole material).Although but the technology that existing current employing coating electrode carries out reeling can reduce to a great extent battery internal resistance but due to electrode shape be square, insufficient for utilizing of button cell inner space, cause the capacity of battery on the low side, simultaneously due to button cell without high current charge-discharge applying working condition, the reduction of internal resistance has little significance.Therefore existing button lithium iron phosphate lithium battery capacity is general very little, simultaneously due to the design feature of rolled electrode, the external diameter of battery is generally greater than more than 10mm, is difficult to the chargeable lithium cell accomplishing 9mm and 6mm diameter system.
For the requirement improving button lithium battery energy density, current most of button lithium battery manufacturing firm is all by adopting thinner collector and barrier film; Strengthen the coating weight of electrode active material to improve the effective rate of utilization of active material.Because electrochemical reaction is originally as the three-dimensional mass transport process of one, the paper tinsel class of and current use known by basic electrochemistry general knowledge is as compared with Copper Foil, aluminium foil, adopt metal foam as the collector of lithium ion battery, significantly improve capacity and the multiplying power discharging property of lithium ion battery.Owing to there is the three-dimensional pore space of porous in foam metal, active material can be made to be filled in this hole, instead of its surface can only be coated in as paper tinsel body collector.And in the porous three-dimensional pore space that active material is filled in foam metal after, not only increase filling rate, and be more conducive to being uniformly distributed with electrolyte permeability, being uniformly distributed of current density due to the three dimensional pore structures of foam metal itself and porous, thus the active material utilization of lithium ion battery can be improved, improve capacity and the multiplying power discharging property of lithium ion battery.On the contrary, for metal foil, active material can only be distributed in the surface of collector.The electric energy changing into chemical energy mainly passes to active material by collector, active material near collector and the active material away from collector widely different point mixing of electric energy, the closer to collector, it is also more even while that its electric energy distributed being more, more away from collector, its electric energy distributed is fewer.Can find out that the metal foil adopted due to affluxion body in lithium ion batteries result in the input and output of lithium ion battery active material and the inhomogeneities of energy in conversion process, have influence on the raising of active material utilization.Due to the electric conductivity excellence of the negative pole graphite type material that lithium battery is commonly used, capacity (general >300mAh/g) is also far above positive pole LiFePO 4 material (general <135mAh/g) simultaneously, so the negative pole of button lithium battery can do very thin, bottleneck is not formed to the overall internal resistance of battery and discharge and recharge reaction; But the conductivity of the LiFePO4 of positive pole is very low, about capacity also only has the half of negative pole, simultaneously also comparatively negative pole is low for compacted density, make and the making its thickness of sheet electrodes and will reach more than 2 times of negative pole of capacity of negative plates coupling, bring the internal resistance of pole piece very large, discharge and recharge mass transport process difficulty.Add the general aluminium of lithium battery anode collector, making three-dimensional conductive collector needs through-hole foam aluminum, shown in CN200610154100 patent.And not yet realize commercialization for the foamed aluminium material of battery, the foam metal of large-scale commercial has foam copper and nickel foam, the oxidizing potential of copper very low being not suitable for does plus plate current-collecting body, and the theoretical oxidation current potential of nickel is about 3.8V, close to the deboost 3.65V of LiFePO4, but due to the irrational state of nickel surface in practical application, cause its oxidizing potential to reduce, so pure foam nickel be not applied in commercial LiFePO4 system lithium battery.
Summary of the invention
The object of this invention is to provide a kind of activity substance content using three-dimensional conductive material to make battery electrode to strengthen, effectively make use of the button-shaped LiFePO4 chargeable lithium cell of a kind of high power capacity in the space of inside battery simultaneously.
For achieving the above object, the technical solution used in the present invention is:
The button-shaped LiFePO4 chargeable lithium cell of a kind of high power capacity, it is characterized in that: barrier film is provided with negative plate, barrier film has positive plate, negative plate is provided with negative pole housing, the external circle of negative electrode casing is provided with sealing ring, and positive plate has positive pole housing, and the external circle of anode cover encases sealing ring by extruding.
The external astragal of described negative electrode casing has coupler body.
Positive plate is disc die-cut electrode formed by three-dimensional conductive skeleton active material, and positive plate three-dimensional conductive skeleton used is the nickel foam with through-hole structure, and positive plate nickel foam conducting matrix grain surface-coated used has can the protective finish of electron conduction.
The present invention has the electrode of three-dimensional conductive skeleton by using; thus make effectively to utilize the wafer type electrode of battery space to be used in chargeable LiFePO4 button cell; simultaneously for improving the corrosion phenomenon that nickel foam under LiFePO4 system 3.65V deboost may occur; its positive conductive skeleton is coated with can the protective finish of electron conduction, stabilizes collector use under high voltages.Thus the battery of this structure is on the actual application.The present invention is the energy density being promoted battery by the utilance of the raising battery useful space, more effectively play the electro-chemical activity of the active material of battery, improve its effective rate of utilization, thus battery capacity is significantly promoted, capacity of the present invention can accomplish 20mAh, capacity improves more than 55% than existing technical merit, also can make the chargeable lithium cell of 9mm and 6mm diameter system easily simultaneously.
Owing to have employed conductive protection coating nickel coating skeleton surface in the present invention; isolate the etch of electrolyte to the imperfect clean state of nickel surface on the one hand; simultaneously due to bonding agent in protective finish and battery positive electrode active material compatibility better; what effectively reduce electrode active material and collector contacts internal resistance, improves the combination property of electrode.The application of nickel foam is achieved, also makes the chargeable electrode of wafer type of thicker degree (2.5 ~ 0.5mm) function admirable be achieved.For making positive pole disk change into as possibility, the present invention has drawn following solution by lot of experiments.The chargeable button lithium battery of this programme is utilized to comprise with lower part: iron phosphate lithium positive pole sheet, barrier film, negative plate, electrolyte and button cell housing.Wherein positive plate is the die-cut disk of nickel foam composite lithium iron phosphate of three-dimensional conductive skeleton.Negative pole adopts manufacturing processes customary to laminate, and barrier film and electrolyte are that traditional lithium-ion battery is used.Battery is assembled by the conventional sandwich structure mode of positive plate/barrier film/negative plate; In a preferred embodiment of the invention; nickel foam adopts slurry technique and protective finish to carry out precoating; adopt slurry technique or membrane compound technology and LiFePO4 to carry out being compounded to form positive pole finished product after abundant drying, pair roller rolls and carry out die-cut suitable diameter to design thickness and compacted density.The diameter consistent with positive pole that negative pole is die-cut after adopting conventional film-forming process to carry out film forming.Inject electrolyte after abundant drying and be assembled into button lithium battery.Foam-expelling nickel and protective finish all the other raw material outer are the known system of lithium battery manufacturing and formula.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the flash-over characteristic schematic diagram of the real embodiment 2 of the utility model.
In accompanying drawing, 1, negative pole housing; 2, sealing ring; 3, positive pole housing; 4, negative plate; 5, barrier film; 6, positive plate.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further described: the button-shaped LiFePO4 chargeable lithium cell of a kind of high power capacity, as shown in Figure 1 and Figure 2, it is characterized in that: barrier film 5 is provided with negative plate 4, barrier film 5 has positive plate 6, negative plate 4 is provided with negative pole housing 1, negative pole housing 1 outer ring is provided with sealing ring 2, and positive plate 6 has positive pole housing (3), and positive pole housing 2 outer ring encases sealing ring 2 by extruding.The external astragal of described negative electrode casing has coupler body; positive plate 6 is disc die-cut electrode formed by three-dimensional conductive skeleton active material; positive plate 6 three-dimensional conductive skeleton used is the nickel foam with through-hole structure, and positive plate 6 nickel foam conducting matrix grain surface-coated used has can the protective finish of electron conduction.
Example 1: the pvdf mixture containing 85% conductive black is fully mixed to design viscosity with nmp solution, be coated in the nickel foam of 80ppi through-hole aperture of the suitable thickness of porosity 85% by slurry technique, for subsequent use after fully dry under uniform temperature, by the LiFePO4 of 91%, 3% conductive black, 1% electrically conductive graphite and 5% the proportioning convention stir pulping way of LA133 binding agent make electrode slurry, same slurry technique is coated on the nickel foam collector of above-mentioned process, with twin rollers normal temperature pair roller to 0.75mm specific thickness, now the surface density of positive active material (not comprising collector) is about 0.1204g/cm2.By the Delanium of 92%, 3% conductive black and 5% PTFE to make the electrode film of 0.35mm design thickness with conventional thin film-forming method, now the surface density of negative electrode active material is about 0.06163g/cm2.Above-mentioned positive and negative electrode pole piece is die-cut into the disk of Ф 15mm with die-cut bonding all-in-one, and respectively it is strictly adhered to one heart on LIR2016 model chargeable lithium battery both positive and negative polarity housing by the lithium special conducting resinl of electricity (as Dag EB-012 etc.), be that the PP nonwoven fabrics barrier film of 0.15mm is die-cut into diameter 17mm by thickness, after adding LiFePO4 system electrolyte, vacuum pumping liquid injection is assembled into button LIR2016 type chargeable lithium cell.
Example 2: the pvdf mixture containing 85% conductive black is fully mixed to design viscosity with nmp solution, be coated in the nickel foam of 80ppi through-hole aperture of the suitable thickness of porosity 85% by slurry technique, for subsequent use after fully dry under uniform temperature, by the LiFePO4 of 91%, 3% conductive black, 1% electrically conductive graphite and 5% the proportioning convention stir pulping way of LA133 binding agent make electrode slurry, same slurry technique is coated on the nickel foam collector of above-mentioned process, its positive pole pair roller to thickness is 0.82mm, the surface density now not comprising the positive active material of collector is about 0.1331g/cm2,
By the Delanium of 92%, 3% conductive black and 5% PTFE obtain with conventional thin film-forming method, its negative pole pair roller thickness is to 0.46mm, and now the surface density of negative electrode active material is about 0.06192g/cm2.Above-mentioned positive and negative electrode pole piece is die-cut into the disk of Ф 8.1mm with die-cut bonding all-in-one, and respectively it is strictly adhered on chargeable lithium battery both positive and negative polarity housing with one heart by the lithium special conducting resinl of electricity (as Dag EB-012 etc.).Be that the PP nonwoven fabrics barrier film of 0.15mm is die-cut into 9.5mm diameter by thickness, after adding LiFePO4 system electrolyte, vacuum pumping liquid injection is assembled into button LIR1220 type chargeable lithium cell.
The LIR2016 size battery that example 1 is made into, its AC internal Resistance is 3.2 ohm.Through the current discharge of 0.2C, its discharge capacity is 24.26mAh;
The LIR1220 size battery that example 2 is made into, its AC internal Resistance is 8.5 ohm.Through the current discharge of 0.2C, when its discharge capacity is 8.02mAh, 10C current discharge, capacity is still up to 6.3mAh, reaches 78% of design capacity, far beyond the use current range of general fastening lithium ionic cell, demonstrates excellent capacity and multiplying power property.
Can be found out by above-mentioned example, apply the buckle type rechargeable lithium iron phosphate lithium battery that method of the present invention is made into, its capacity is close to the performance of traditional 3.6V system button cell, super existing 3.2V LiFePO4 system far away, improve more than 55% than existing technical merit, apply the chargeable lithium cell that said method also can make 9mm and 6mm diameter system easily simultaneously.Extend the range of application of chargeable lithium battery.
Embodiment recited above is only be described preferred implementation of the present utility model; not design of the present utility model and protection range are limited; under the prerequisite not departing from the utility model design concept; the various modification that in this area, common engineers and technicians make the technical solution of the utility model and improvement, all should fall into protection range of the present utility model.
Claims (5)
1. the button-shaped LiFePO4 chargeable lithium cell of high power capacity, it is characterized in that: barrier film (5) is provided with negative plate (4), barrier film (5) has positive plate (6), negative plate (4) is provided with negative pole housing (1), negative pole housing (1) outer ring is provided with sealing ring (2), positive plate (6) has positive pole housing (3), and positive pole housing (2) outer ring encases sealing ring (2) by extruding.
2. the button-shaped LiFePO4 chargeable lithium cell of a kind of high power capacity according to claim 1, is characterized in that: the external astragal of described negative electrode casing has coupler body.
3. the button-shaped LiFePO4 chargeable lithium cell of a kind of high power capacity according to claim 1, is characterized in that: described positive plate (6) is disc die-cut electrode formed by three-dimensional conductive skeleton active material.
4. the button-shaped LiFePO4 chargeable lithium cell of a kind of high power capacity according to claim 1, is characterized in that: the three-dimensional conductive skeleton that described positive plate (6) is used is the nickel foam with through-hole structure.
5. the button-shaped LiFePO4 chargeable lithium cell of a kind of high power capacity according to claim 1, is characterized in that: described positive plate (6) nickel foam conducting matrix grain surface-coated used has can the protective finish of electron conduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520117958.9U CN204441383U (en) | 2015-02-27 | 2015-02-27 | The button-shaped LiFePO4 chargeable lithium cell of a kind of high power capacity |
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| CN201520117958.9U CN204441383U (en) | 2015-02-27 | 2015-02-27 | The button-shaped LiFePO4 chargeable lithium cell of a kind of high power capacity |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111342114A (en) * | 2020-02-17 | 2020-06-26 | 惠州西盛科技有限公司 | Metal shell lithium ion battery without welding and winding and process thereof |
| CN113540555A (en) * | 2020-04-17 | 2021-10-22 | 北京好风光储能技术有限公司 | Button type thick electrode battery |
| CN113795955A (en) * | 2021-03-30 | 2021-12-14 | 宁德新能源科技有限公司 | Battery and electronic device using same |
-
2015
- 2015-02-27 CN CN201520117958.9U patent/CN204441383U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111342114A (en) * | 2020-02-17 | 2020-06-26 | 惠州西盛科技有限公司 | Metal shell lithium ion battery without welding and winding and process thereof |
| CN113540555A (en) * | 2020-04-17 | 2021-10-22 | 北京好风光储能技术有限公司 | Button type thick electrode battery |
| CN113540555B (en) * | 2020-04-17 | 2022-06-28 | 北京好风光储能技术有限公司 | Button type thick electrode battery |
| CN113795955A (en) * | 2021-03-30 | 2021-12-14 | 宁德新能源科技有限公司 | Battery and electronic device using same |
| WO2022205011A1 (en) * | 2021-03-30 | 2022-10-06 | 宁德新能源科技有限公司 | Battery and electronic device applying same |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150701 Termination date: 20180227 |