CN203707250U - Lithium battery - Google Patents
Lithium battery Download PDFInfo
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- CN203707250U CN203707250U CN201420047652.6U CN201420047652U CN203707250U CN 203707250 U CN203707250 U CN 203707250U CN 201420047652 U CN201420047652 U CN 201420047652U CN 203707250 U CN203707250 U CN 203707250U
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- Prior art keywords
- current collector
- negative
- lithium battery
- collecting body
- plus plate
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 96
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 229910052751 metal Inorganic materials 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 18
- 230000004888 barrier function Effects 0.000 claims description 30
- 238000009413 insulation Methods 0.000 claims description 16
- 239000004743 Polypropylene Substances 0.000 claims description 14
- -1 polyethylene Polymers 0.000 claims description 14
- 239000011888 foil Substances 0.000 claims description 13
- 229920001155 polypropylene Polymers 0.000 claims description 12
- 239000007774 positive electrode material Substances 0.000 claims description 10
- 239000004698 Polyethylene Substances 0.000 claims description 8
- 239000005030 aluminium foil Substances 0.000 claims description 8
- 229920000573 polyethylene Polymers 0.000 claims description 7
- 229910044991 metal oxide Inorganic materials 0.000 claims description 6
- 150000004706 metal oxides Chemical class 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 4
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 14
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 6
- 239000011149 active material Substances 0.000 abstract description 3
- 238000002955 isolation Methods 0.000 abstract 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 8
- 239000003792 electrolyte Substances 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000011889 copper foil Substances 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 4
- 238000009713 electroplating Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 238000004513 sizing Methods 0.000 description 3
- QGHDLJAZIIFENW-UHFFFAOYSA-N 4-[1,1,1,3,3,3-hexafluoro-2-(4-hydroxy-3-prop-2-enylphenyl)propan-2-yl]-2-prop-2-enylphenol Chemical group C1=C(CC=C)C(O)=CC=C1C(C(F)(F)F)(C(F)(F)F)C1=CC=C(O)C(CC=C)=C1 QGHDLJAZIIFENW-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910001290 LiPF6 Inorganic materials 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000011258 core-shell material Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000006245 Carbon black Super-P Substances 0.000 description 1
- 229910032387 LiCoO2 Inorganic materials 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000006183 anode active material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000009747 press moulding Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011257 shell material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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
Abstract
The utility model discloses a lithium battery. The lithium battery comprises a battery cell, wherein the battery cell comprises a positive pole piece, a negative pole piece, and an isolation film arranged between the positive pole piece and the negative pole piece; the positive pole piece comprises a positive pole current collector and a positive pole ear welded to the positive pole current collector; positive pole active materials are arranged on two sides of the positive pole current collector; the negative pole piece comprises a negative pole current collector and a negative pole ear welded to the negative pole ear of the negative pole current collector; a metal lithium layer is plated onto the surface of the negative pole current collector. According to the lithium battery provided by the utility model, the negative pole current collector is not required to be coated with a negative pole active material, so that the process is simplified, and the operation is simple and convenient; the metal lithium layer is plated onto the surface of the negative pole current collector, so that the characteristic of high energy of a primary lithium battery and the characteristic of high efficiency of a rechargeable lithium ion battery are effectively combined, and the energy density and the power density of the lithium battery are greatly increased; the lithium battery has the characteristics of high-efficiency, high energy, and low self-discharge rate, can satisfy the requirement of constant upgrading of electronic equipment, and can be widely applied to the electronic equipment.
Description
Technical field
The utility model relates to technical field of lithium batteries, relates in particular to the lithium battery of a kind of high power, high-energy and low self-discharge rate.
Background technology
It is wide that lithium battery has operating temperature range, discharging voltage balance, the advantage such as self-discharge rate is low, long service life, the fields such as various fields, particularly space flight and aviation, military affairs, long-life instrument and meter, material flow tracking, automotive electronics, mobile digital product are widely used in.In recent years, along with scientific and technological development, the function of electronic equipment is constantly upgraded, and therefore the energy to lithium battery and high rate performance are had higher requirement, and high energy battery has become the primary study direction of battery industry.
Lithium battery is divided into lithium primary cell (primary cell) and lithium ion battery (secondary cell).Comparatively speaking, lithium primary cell has higher energy density, mainly because adopting lithium an-ode, it adopt the theoretical gram volume of carbon back negative pole large than lithium ion battery, the theoretical gram volume of lithium an-ode is 3860mAh/g, and the theoretical gram volume of carbon back negative pole is 372mAh/g, but because thin lithium an-ode is difficult to make, therefore the power output of lithium primary cell is lower, and rechargeable lithium ion batteries can meet electronic equipment conventionally for high-power requirement, mainly because the carbonaceous material that its negative pole is strong conductivity, and utilize the mode applying on negative current collector, to adhere to the adjustable active material of a layer thickness, and increase by the mode of coiling or lamination the area that both positive and negative polarity contacts, thereby improve the power density of battery.But the theoretical gram volume of its carbon material used as anode of rechargeable lithium ion batteries is lower, and in the structure of conventional lithium ion battery, although utilize the mode of coiling or lamination to improve the power density of battery, but reduced the energy density of battery, therefore the structure of conventional rechargeable lithium ion batteries is unfavorable for improving the energy density of battery.
Utility model content
The purpose of this utility model is: a kind of lithium battery is provided, and it has advantages of that power output is high, energy density is high and low self-discharge rate.
For reaching above-mentioned purpose, the utility model by the following technical solutions:
A kind of lithium battery, comprise battery core, described battery core comprises positive plate, negative plate and the barrier film between described positive plate and described negative plate, described positive plate comprises plus plate current-collecting body and is welded in the positive pole ear on described plus plate current-collecting body, the two sides of described plus plate current-collecting body is provided with positive electrode active materials, described negative plate comprises negative current collector and be welded in the negative lug on described negative current collector, and the surface electrical of described negative current collector is coated with lithium metal layer.
By the electroplating surface metal lithium layer of the negative current collector at negative plate, making no longer needs to apply negative active core-shell material on negative current collector, has greatly saved the space of lithium battery, has simplified operational sequence, has improved the energy density of lithium battery.
As a kind of preferred version of lithium battery, described negative current collector adopts metal foil or wire netting to make; And/or described plus plate current-collecting body adopts aluminium foil.
Make by negative current collector being adopted to metal foil or wire netting, then adopt plating mode to plate lithium on metal foil or wire netting, can thinning negative pole lithium layer, increase the tensile strength of lithium layer, realize the heavy-current discharge of battery, improved the power density of battery.
Preferably, described negative current collector adopts any one in aluminium foil, tinfoil paper, nickel foil, Copper Foil.
Preferably, described negative current collector adopts any one in aluminium net, tin net, nickel screen, copper mesh.
As a kind of preferred version of lithium battery, metal foil or wire netting that described negative current collector employing thickness is 6～25 μ m are made; And/or it is 8～80 μ m lithium metal layers that the surface electrical of described negative current collector is coated with thickness.
Preferred, it is 2～54 μ m lithium metal layers that the surface electrical of described negative current collector is coated with thickness.
In core strueture of the present utility model, negative pole currect collecting body thickness is that metal foil or the wire netting of 6～25 μ m made, and this has saved space to lithium battery, can increase anodal useful load, improves the energy density of lithium battery.
Optionally, the mode of described negative current collector plating lithium layer can adopt conventional electroless plating mode.
Preferably, it is that 0.05～0.2C current charges is to 4.0V that described lithium battery changes into flow process first, by 0.2～1C current charges to 4.2V, in to lithium cell charging process, the Li+ that less charging current makes to deviate from from positive electrode is slowly deposited on negative current collector and forms the lithium layer of even compact, improve the fail safe of battery, and by changing into, lithium reversible in positive electrode active materials is deviate from, form de-lithium state positive electrode active materials, the Li+ electroplating deposition that positive pole is deviate from, at negative pole currect collecting matrix surface, forms lithium anode active material; Battery is in discharge process, and the Li+ being deviate from by negative pole dissociates to positive pole and embeds in de-lithium state positive electrode active materials.
As collector and above-mentioned lithium depositional mode, not only improve the tensile strength of pole piece based on metal foil or wire netting, and improved the fast transferring ability of lithium ion, thereby improved power density.
As a kind of preferred version of lithium battery, described positive plate also comprises the anodal diaphragm that is arranged at described plus plate current-collecting body two sides, described positive electrode active materials is arranged on described anodal diaphragm, described positive pole ear is welded in the first end of described plus plate current-collecting body, described plus plate current-collecting body also has second end relative with described first end, the two sides of the described plus plate current-collecting body of close described the second end are provided with the exposed part of different size, be provided with anodal insulation gummed paper at described first end, described anodal insulating cement paper bag is wrapped up in first end and the described positive pole ear of described plus plate current-collecting body, and/or,
Described negative current collector is provided with negative pole insulation gummed paper near one end of described negative lug, and described negative pole insulating cement paper bag is wrapped up in end and the described negative lug of described negative current collector near described negative lug.
Preferably, described anodal insulation gummed paper and described plus plate current-collecting body and described positive pole ear are bonding;
Described negative pole insulation gummed paper and described negative current collector and described negative lug are bonding.
As a kind of preferred version of lithium battery, the exposed part that the two sides of the described plus plate current-collecting body of close described the second end arrange is respectively 5～15mm and 15～45mm along the exposed length of the length direction of described plus plate current-collecting body, and the exposed length difference of two described exposed parts is between 10～30mm.
As a kind of preferred version of lithium battery, described negative plate, described barrier film and described positive plate are sequentially wound as battery core, the length of described plus plate current-collecting body is greater than the length of described negative current collector, the side that the exposed length of the exposed part near the second end of described plus plate current-collecting body is long is positioned at the outer ring of described battery core, for wrapping up described negative current collector.
Preferably, the long 5～15mm of the length of negative current collector described in the Length Ratio of described plus plate current-collecting body.
As a kind of preferred version of lithium battery, described negative current collector is planar structure.
As a kind of preferred version of lithium battery, on described negative current collector, be provided with concaveconvex structure and/or tortuous structure.
By will concaveconvex structure or tortuous structure being set on negative current collector, can provide collector flexible space, increase the useful load of unit are lithium metal, avoid, because the volumetric expansion of plating lithium causes plus plate current-collecting body and negative current collector fracture, improving the recoverable amount of electrolyte in battery simultaneously; By by concaveconvex structure or tortuous structure are set on negative current collector, cushioning effect can be provided, improve the security performance of battery, have simple in structure, cost is low and the feature such as handling ease.
Preferably, on described negative current collector, be formed with described concaveconvex structure or tortuous structure by roll-in or mold pressing.
As a kind of preferred version of lithium battery, the thickness of described plus plate current-collecting body is 12～25 μ m; And/or the thickness of described negative current collector is 6～60 μ m.
As a kind of preferred version of lithium battery, any one in the polyethylene barrier film that described barrier film is polypropylene-polyethylene-polypropylene composite bed barrier film, polypropylene individual layer barrier film, polyethylene individual layer barrier film, the surface-coated polypropylene barrier film that has metal oxide, surface-coated has metal oxide.
The beneficial effects of the utility model are: on cathode of lithium battery collector of the present utility model, do not need to apply negative active core-shell material, simplify process operation, simple and convenient, by at negative current collector electroplating surface metal lithium layer, effectively combine the high-power feature of disposable lithium-battery high-energy and rechargeable lithium ion batteries, energy density and the power density of lithium battery are greatly improved, there is the characteristic of high power, high-energy, low self-discharge rate, can meet the constantly demand of upgrading of electronic functionalities, can be widely used in electronic equipment.
Brief description of the drawings
Fig. 1 is the schematic cross-section of the lithium battery described in embodiment;
Fig. 2 is the planar structure schematic diagram of positive plate in the lithium battery described in embodiment;
Fig. 3 is the cross section structure schematic diagram of positive plate in the lithium battery described in embodiment;
Fig. 4 is the planar structure schematic diagram of negative plate in the lithium battery described in embodiment;
Fig. 5 is a kind of cross section structure schematic diagram of negative plate in the lithium battery described in embodiment;
Fig. 6 is the another kind of cross section structure schematic diagram of negative plate in the lithium battery described in embodiment;
Fig. 7 is another cross section structure schematic diagram of negative plate in the lithium battery described in embodiment.
In figure:
1, housing; 2, electrolyte; 3, positive plate; 31, plus plate current-collecting body; 311, first end; 312, the second end; 32, anodal diaphragm; 33, positive pole ear; 34, anodal insulation gummed paper; 4, barrier film; 5, negative plate; 51, negative current collector; 511, concaveconvex structure; 52, negative lug; 53, negative pole insulation gummed paper.
Embodiment
Further illustrate the technical solution of the utility model below in conjunction with accompanying drawing and by embodiment.
As shown in Figure 1, lithium battery of the present utility model comprises housing 1, electrolyte 2 and is located at the battery core in housing, and battery core comprises positive plate 3, negative plate 5 and the barrier film 4 between positive plate 3 and negative plate 5.
Wherein, electrolyte 2 comprises lithium salts and solvent, and barrier film 4 adopts polypropylene-polyethylene-polypropylene composite bed barrier film, polypropylene individual layer barrier film, polyethylene individual layer barrier film, surface-coated to have any one in polypropylene barrier film, the polyethylene barrier film that surface-coated has metal oxide of metal oxide.The present embodiment electrolyte 2 adopts lithium hexafluoro phosphate (LiPF6), and barrier film 4 adopts polypropylene-polyethylene-polypropylene composite bed barrier film.
As shown in Figures 2 and 3, positive plate 3 comprises plus plate current-collecting body 31 and is welded on the positive pole ear 33 of plus plate current-collecting body 31 one end, the two sides of plus plate current-collecting body 31 is provided with positive electrode active materials, positive plate 3 also comprises the anodal diaphragm 32 that is arranged on plus plate current-collecting body 31 two sides, positive electrode active materials is arranged on anodal diaphragm 32, plus plate current-collecting body 31 has the first end 311 that is welded with positive pole ear 33, second end 312 relative with first end 311, the two sides of the plus plate current-collecting body 31 of close the second end 312 are provided with the exposed part of different size, be provided with anodal insulation gummed paper 34 at first end 311, anodal insulation gummed paper 34 wraps up first end 311 and the positive pole ear 33 of plus plate current-collecting body 31.
The exposed part that the two sides of the plus plate current-collecting body 31 of close the second end 312 arrange is respectively 5～15mm and 15～45mm along the exposed length of the length direction of plus plate current-collecting body 31, and the length difference of two exposed parts is between 10～30mm, in the present embodiment, the exposed length that is positioned at the upper side of plus plate current-collecting body 31 is 10mm, and the exposed length that is positioned at the downside of plus plate current-collecting body 31 is 32mm.
Plus plate current-collecting body 31 is the aluminium foil of thickness 12～25 μ m.In the present embodiment, it is the aluminium foil that 16 μ m, length are 168mm that plus plate current-collecting body 31 adopts thickness.
As shown in Fig. 4,6, negative plate 5 comprises negative current collector 51 and is welded on the negative lug 52 of negative current collector 51 one end, the electroplating surface metal lithium layer of negative current collector 51, negative current collector 51 is provided with negative pole insulation gummed paper 53 near one end of negative lug 52, and negative pole insulation gummed paper 53 wraps up end and the negative lug 52 of negative current collector 51 near negative lug 52.
Negative current collector 51 adopts metal foil or wire netting to make, 6～25 μ m of metal foil or wire netting.
Metal foil can be selected any one in aluminium foil, tinfoil paper, nickel foil, Copper Foil, and wire netting can aluminium net, any one in tin net, nickel screen, copper mesh.The present embodiment negative current collector 51 adopts Copper Foil.
As shown in Figure 6, on the negative current collector 51 of the negative plate 5 of the present embodiment, be provided with concaveconvex structure 511, this concaveconvex structure 511 can adopt roll-in or press moulding mode compacting to form.In other embodiment, negative current collector 51 can also have other versions, and for example, referring to Fig. 5, the negative current collector 51 of negative plate 5 adopts planar structure.Referring to Fig. 7, the negative current collector 51 of negative plate 5 adopts the tortuous structure of arc.
In the present embodiment, anodal insulation gummed paper 34 is bonding with plus plate current-collecting body 31 and positive pole ear 33, and negative pole insulation gummed paper 53 is bonding with negative current collector 51 and negative lug 52.
The present embodiment adopts negative plate 5, barrier film 4 and positive plate 3 is sequentially wound as to battery core, the length of plus plate current-collecting body 31 is greater than the length of negative current collector 51, the side (downside of plus plate current-collecting body 31 in Fig. 3) that the exposed length of the exposed part near the second end 312 of plus plate current-collecting body 31 is long is positioned at the outer ring of described battery core, for wrapping up negative current collector 51.
Described in the present embodiment, lithium battery adopts following methods preparation:
(1), as shown in Figure 2, the making of positive plate 3: the cobalt acid lithium (LiCoO2) taking gram volume as 140mAh/g is positive electrode active materials, mass ratio mixing and stirring in NMP of pressing 95:2:3 with binding agent PVDF and conductive agent Super-P, make anode sizing agent, the density of pressing 33.0mg/cm2 by anode sizing agent dual coating on plus plate current-collecting body 31, it is 16 μ m that plus plate current-collecting body adopts thickness, length is the aluminium foil of 168mm, anode sizing agent length of dual coating on aluminium foil is respectively 130mm and 152mm, form anodal diaphragm 32, wherein the exposed length of the exposed part on the collector two sides of the second end 312 of plus plate current-collecting body 31 is respectively 32mm and 10mm, cutting into thickness through colding pressing is 0.107mm, width is the pole piece of 42mm, weld positive pole ear 33 in end and stick anodal insulation gummed paper 34 and obtain positive plate 3,
(2), as shown in Figure 6, the making of negative plate 5: the Copper Foil of getting 9 μ m, cutting into length is the Copper Foil that 153mm, width are 44mm, forming thickness by roll-in or mold pressing is 20 μ m the negative current collector 51 with concaveconvex structure 511, welds negative lug 52 and stick negative pole insulation gummed paper 53 to obtain negative plate 5 in collector upper end;
(3), the making of barrier film 4: adopting thickness is polypropylene, polyethylene/polypropylene (PP/PE/PP) composite bed barrier film of 16 μ m, and length is that 320mm, width are 46mm;
(4), the making of electrolyte 2: lithium hexafluoro phosphate (LiPF6) is joined in solvent, mix and obtain electrolyte;
(5), the making of lithium battery: negative plate 5 obtained above, barrier film 4 and positive plate 3 are reeled and obtained lithium battery electric core, then battery core packed in aluminum plastic film packaging shell 1 and inject the rear sealing of electrolyte 2;
(6), lithium battery change into and aging: with 13mA(0.05C) the electric current lithium cell charging that just step (5) makes to 4.0V, use again 52mA(0.2C) current charges to 4.2V, then lithium battery aging 48h aftershaping in 45 DEG C of baking boxs is obtained to the present embodiment model and is 68500 lithium battery.
Lithium battery of the present utility model has the following advantages with respect to prior art:
1., high-energy-density: because negative pole currect collecting body thickness in the core strueture of the lithium battery of the present embodiment is the metal foil of 6～25 μ m, this has saved space to lithium battery, can increase anodal useful load, improves the energy density of lithium battery;
2., high power density: the mode that the utilization of the utility model lithium battery is electroplated, in lithium cell charging process, positive electrode is deviate from Li+ and is deposited on the lithium layer that forms thin layer on negative current collector, mode based on metal foil as collector and lithium deposition, not only improve the tensile strength of pole piece, and the fast transferring ability of raising lithium ion, thereby improve power density;
3., low self-discharge rate: the utlity model has and the similar structure of primary cell, there is extremely low self-discharge rate.
In description of the present utility model, it will be appreciated that, term " on ", the orientation such as D score or position relationship be based on orientation shown in the drawings or position relationship, only for convenience of description and simplify the operation, instead of indicate or imply that the device of indication or element must have specific orientation, construct and operation with specific orientation, because can not be interpreted as restriction of the present utility model.
In addition, term " first ", " second ", only, for being distinguished on describing, do not have special implication.
What need statement is; above-mentioned embodiment is only preferred embodiment of the present utility model and institute's application technology principle; in technical scope disclosed in the utility model; the variation that any those skilled in the art of being familiar with easily expect or replacement, all should be encompassed in protection range of the present utility model.
Claims (10)
1. a lithium battery, it is characterized in that, comprise battery core, described battery core comprises positive plate, negative plate and the barrier film between described positive plate and described negative plate, described positive plate comprises plus plate current-collecting body and is welded in the positive pole ear on described plus plate current-collecting body, the two sides of described plus plate current-collecting body is provided with positive electrode active materials, and described negative plate comprises negative current collector and be welded in the negative lug on described negative current collector, and the surface electrical of described negative current collector is coated with lithium metal layer.
2. lithium battery according to claim 1, is characterized in that, described negative current collector adopts metal foil or wire netting to make; And/or,
Described plus plate current-collecting body adopts aluminium foil.
3. lithium battery according to claim 2, is characterized in that, metal foil or wire netting that described negative current collector employing thickness is 6～25 μ m are made; And/or,
It is 8～80 μ m lithium metal layers that the surface electrical of described negative current collector is coated with thickness.
4. lithium battery according to claim 2, it is characterized in that, described positive plate also comprises the anodal diaphragm that is arranged at described plus plate current-collecting body two sides, described positive electrode active materials is arranged on described anodal diaphragm, described positive pole ear is welded in the first end of described plus plate current-collecting body, described plus plate current-collecting body also has second end relative with described first end, the two sides of the described plus plate current-collecting body of close described the second end are provided with the exposed part of different size, be provided with anodal insulation gummed paper at described first end, described anodal insulating cement paper bag is wrapped up in first end and the described positive pole ear of described plus plate current-collecting body, and/or,
Described negative current collector is provided with negative pole insulation gummed paper near one end of described negative lug, and described negative pole insulating cement paper bag is wrapped up in end and the described negative lug of described negative current collector near described negative lug.
5. lithium battery according to claim 4, it is characterized in that, the exposed part that the two sides of the described plus plate current-collecting body of close described the second end arrange is respectively 5～15mm and 15～45mm along the exposed length of the length direction of described plus plate current-collecting body, and the exposed length difference of two described exposed parts is between 10～30mm.
6. lithium battery according to claim 5, it is characterized in that, described negative plate, described barrier film and described positive plate are sequentially wound as battery core, the length of described plus plate current-collecting body is greater than the length of described negative current collector, the side that the exposed length of the exposed part near the second end of described plus plate current-collecting body is long is positioned at the outer ring of described battery core, for wrapping up described negative current collector.
7. according to the lithium battery described in claim 1 to 6 any one, it is characterized in that, described negative current collector is planar structure.
8. according to the lithium battery described in claim 1 to 6 any one, it is characterized in that, on described negative current collector, be provided with concaveconvex structure and/or tortuous structure.
9. according to the lithium battery described in claim 1 to 6 any one, it is characterized in that, the thickness of described plus plate current-collecting body is 12～25 μ m; And/or,
The thickness of described negative current collector is 6～60 μ m.
10. according to the lithium battery described in claim 1 to 6 any one, it is characterized in that any one in the polyethylene barrier film that described barrier film is polypropylene-polyethylene-polypropylene composite bed barrier film, polypropylene individual layer barrier film, polyethylene individual layer barrier film, the surface-coated polypropylene barrier film that has metal oxide, surface-coated has metal oxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420047652.6U CN203707250U (en) | 2014-01-24 | 2014-01-24 | Lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420047652.6U CN203707250U (en) | 2014-01-24 | 2014-01-24 | Lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203707250U true CN203707250U (en) | 2014-07-09 |
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| CN201420047652.6U Expired - Lifetime CN203707250U (en) | 2014-01-24 | 2014-01-24 | Lithium battery |
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