CN203574063U - Lithium ion battery - Google Patents
Lithium ion battery Download PDFInfo
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- CN203574063U CN203574063U CN201320800920.2U CN201320800920U CN203574063U CN 203574063 U CN203574063 U CN 203574063U CN 201320800920 U CN201320800920 U CN 201320800920U CN 203574063 U CN203574063 U CN 203574063U
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- lithium ion
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 48
- 229910052751 metal Inorganic materials 0.000 claims abstract description 96
- 239000002184 metal Substances 0.000 claims abstract description 96
- 230000004888 barrier function Effects 0.000 claims description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 239000011149 active material Substances 0.000 claims description 9
- 230000000977 initiatory effect Effects 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
- 239000004677 Nylon Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- 229910000914 Mn alloy Inorganic materials 0.000 claims description 2
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000011651 chromium Substances 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims 1
- 229920001169 thermoplastic Polymers 0.000 claims 1
- 239000004416 thermosoftening plastic Substances 0.000 claims 1
- 230000006378 damage Effects 0.000 abstract description 3
- 239000006183 anode active material Substances 0.000 abstract 1
- 239000006182 cathode active material Substances 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 description 25
- 230000000052 comparative effect Effects 0.000 description 17
- 239000003792 electrolyte Substances 0.000 description 10
- 239000010410 layer Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 238000004806 packaging method and process Methods 0.000 description 8
- 239000002356 single layer Substances 0.000 description 7
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 description 6
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 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 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910013872 LiPF Inorganic materials 0.000 description 3
- 101150058243 Lipf gene Proteins 0.000 description 3
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 3
- XBDQKXXYIPTUBI-UHFFFAOYSA-N Propionic acid Chemical compound CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 3
- 230000032683 aging Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 229910003002 lithium salt Inorganic materials 0.000 description 3
- 159000000002 lithium salts Chemical class 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 239000002985 plastic film Substances 0.000 description 3
- 229920006255 plastic film Polymers 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011267 electrode slurry Substances 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
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- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000006257 cathode slurry Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 150000002739 metals Chemical class 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
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- 238000011076 safety test Methods 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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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
-
- 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
Abstract
The utility model provides a lithium ion battery, which comprises a cell and at least one insulated metal structure, wherein the cell comprises a cathode plate, an anode plate and an isolating film, wherein the cathode plate comprises a cathode current collector and a cathode diaphragm which is arranged on the surface of the cathode current collector and contains cathode active materials; the anode plate comprises an anode current collector and an anode diaphragm which is arranged on the surface of the anode current collector and contains anode active materials; and the isolating film is arranged between the cathode plate and the anode plate; the insulated metal structure is relatively arranged on the surface of the cathode plate and/or the anode plate in the cell and comprises a metal sheet and insulating layers, wherein the strength of the metal sheet is higher than the strength of the cathode current collector and the anode current collector; the insulating layers cover the upper surface and the lower surface of the metal sheet. By arranging the insulated metal structure, the mechanical strength of the cell can be improved, the destruction caused by stress to the plates can be effectively relieved and the probability that the plates are short-circuited is reduced; and the electrochemical performance of the cell is not influenced.
Description
Technical field
The utility model relates to a kind of battery, relates in particular to a kind of lithium ion battery.
Background technology
Along with the development of hyundai electronics information technology, the advantage such as lithium ion battery is high with its energy density, have extended cycle life, becomes the indispensable chemical power source of hyundai electronics information products.But, along with capacity or the energy density of battery core are more and more higher, battery core is not destroyed in the situation that not predicted, thereby cause battery core burning (such as electronic product is pounded disconnected or battery core side when being squeezed by foreign matter, battery core is very likely burnt), therefore to a certain extent, cause existing battery core to be more and more difficult to meet the safe handling requirement of client to electronic product.
For head it off, many lithium ion batteries manufacturer often improves the security performance of battery core by reducing the reactivity of electrode, such as selecting the good clad material of security performance, reduce the electric conductivity of negative electrode, on pole piece, be coated with the material of one deck energy slowing down cathode reaction, or in electrolyte, add the additive that improves security performance, also someone introduces PTC negative electrode, although all these series of measures can make the security performance of battery core obtain improvement to a certain extent, but have to reduce the chemical property of battery core, high rate performance such as battery core, high low temperature charge-discharge performance, cycle performances etc. are but subject to impact to a certain extent.
Utility model content
In view of the problem existing in background technology, the purpose of this utility model is to provide a kind of lithium ion battery, and it can improve the mechanical strength of battery core and the security performance of battery core, does not affect the chemical property of battery core simultaneously.
To achieve these goals, the utility model provides a kind of lithium ion battery, and it comprises: battery core, and at least one insulated metal structure.Wherein, battery core comprises: cathode sheet, the lip-deep negative electrode diaphragm that contains active material of cathode that comprises cathode current collector and be arranged on cathode current collector; Anode pole piece, the lip-deep anode diaphragm that contains active material of positive electrode that comprises anode collector and be arranged on anode collector; And barrier film, between cathode sheet and anode pole piece.Each insulated metal structure is oppositely arranged on cathode sheet in battery core and/or the surface of anode pole piece; Wherein, each insulated metal structure comprises: sheet metal, and its intensity is higher than the intensity of cathode current collector and anode collector; And insulating barrier, cover upper surface and the lower surface of sheet metal.
The beneficial effects of the utility model are as follows:
By insert insulated metal structure in battery core, can improve significantly the mechanical strength of battery core, when having external force to pound to battery core, can effectively slow down pole piece because of the stressed destruction causing, thereby reduce the probability of pole piece short circuit; When improving battery core security performance, do not affect the chemical property of battery core.
Accompanying drawing explanation
Fig. 1 is according to the floor map of an embodiment of lithium ion battery of the present utility model;
Fig. 2 is according to the floor map of an embodiment of lithium ion battery of the present utility model;
Fig. 3 is according to the floor map of an embodiment of lithium ion battery of the present utility model;
Fig. 4 is according to the floor map of an embodiment of lithium ion battery of the present utility model;
Fig. 5 is according to the floor map of an embodiment of lithium ion battery of the present utility model;
Fig. 6 is according to the schematic perspective view of the insulated metal structure of lithium ion battery of the present utility model; And
Fig. 7 is the at room temperature comparison diagram of cycle performance of the lithium ion battery of embodiment 4 and the lithium ion battery of comparative example 1, and its endless form is that 0.5C discharges and recharges.
Wherein, description of reference numerals is as follows:
1 battery core 122 anode diaphragms
11 cathode sheet 13 barrier films
111 cathode current collector 2 insulated metal structures
112 negative electrode diaphragm 21 sheet metals
12 anode pole piece 22 insulating barriers
121 anode collector
Embodiment
Describe in detail with reference to the accompanying drawings according to lithium ion battery of the present utility model.
Referring to figs. 1 through Fig. 6, according to lithium ion battery of the present utility model, comprise battery core 1 and at least one insulated metal structure 2.Battery core 1 comprises: cathode sheet 11, the lip-deep negative electrode diaphragm 112 that contains active material of cathode that comprises cathode current collector 111 and be arranged on cathode current collector 111; Anode pole piece 12, the lip-deep anode diaphragm 122 that contains active material of positive electrode that comprises anode collector 121 and be arranged on anode collector 121; And barrier film 13, between cathode sheet 11 and anode pole piece 12.Each insulated metal structure 2 is oppositely arranged on cathode sheet 11 in battery core 1 and/or the surface of anode pole piece 12; Wherein, each insulated metal structure 2 comprises: sheet metal 21, and its intensity is higher than the intensity of cathode current collector 111 and anode collector 121; And insulating barrier 22, cover upper surface and the lower surface of sheet metal 21.It should be noted, although shown in Fig. 1 to Fig. 5 be an insulated metal structure 2, the quantity of insulated metal structure 2 can be defined as more than one depending on concrete actual conditions.Also it should be noted that, for convenience of explanation and for the sake of clarity, in Fig. 1 to Fig. 5, especially in Fig. 4 and Fig. 5, what illustrate is the spatial relation being oppositely arranged of insulated metal structure 2.
By adopting intensity higher than the insulated metal structure 2 of the sheet metal 21 of the intensity of cathode current collector 111 and anode collector 121, can improve significantly the mechanical strength of battery core, when having external force to pound to battery core 1, can effectively slow down battery core 1 because of the stressed destruction causing, thereby reduce the probability of cathode sheet 11 and anode pole piece 12 short circuits, improved the security performance of battery core 1.
By adopting insulating barrier 22, can prevent that sheet metal 21 from contacting self discharge or internal short-circuit that formation loop causes with cathode sheet 11 or anode pole piece 12, meanwhile, also can prevent that sheet metal 21 burrs on edges from contacting the micro-short circuit that formation loop causes with cathode sheet 11 or anode pole piece 12.
According in lithium ion battery of the present utility model, also can comprise: electrolyte; And packaging bag, packaging electric core 1 also holds electrolyte so that electrolyte infiltrates negative electrode diaphragm 112 and anode diaphragm 122.
In an embodiment of insulated metal structure 2, sheet metal 21 can be selected from a kind of in steel disc, iron plate, chromium sheet, platinized platinum, titanium alloy sheet, manganese alloy sheet.
In one embodiment, insulating barrier 22 can be nylon layer.
In an embodiment of insulated metal structure 2, the edge of each insulated metal structure 2 can be coated with insulating cement (not shown).Smoother is answered at the edge of insulated metal structure 2, when the more sharp-pointed or sharp generation burr in edge, adopt insulating cement burrs on edges can be covered, thereby prevent that sheet metal 21 from contacting self discharge or internal short-circuit that formation loop causes with cathode sheet 11 or anode pole piece 12.
According in an embodiment of lithium ion battery of the present utility model, referring to figs. 1 through Fig. 3, when battery core 1 is takeup type battery core, insulated metal structure 2 be oppositely arranged on takeup type battery core initiating terminal place the cathode sheet without negative electrode diaphragm 112 11 surface or do not there is the surface of the anode pole piece 12 of anode diaphragm 122, the thickness of this insulated metal structure 2 is less than or equal to the thickness sum of negative electrode diaphragm 112 with the anode diaphragm 122 of battery core 1.Particularly, in Fig. 1, an insulated metal structure 2 separates the surface of the anode pole piece without anode diaphragm 122 12 at the initiating terminal place that is indirectly arranged on takeup type battery core by barrier film 13; Certainly for different battery core structure of lithium-ion batteries, an insulated metal structure 2 can separate by barrier film 13 surface of the cathode sheet without negative electrode diaphragm 112 11 at the initiating terminal place that is indirectly arranged on takeup type battery core.In Fig. 2 and Fig. 3, insulated metal structure 2 be set directly at takeup type battery core initiating terminal place the cathode sheet without negative electrode diaphragm 112 11 surface (with reference to Fig. 3) or do not there is the surface (with reference to Fig. 2) of the anode pole piece 12 of anode diaphragm 122.
According in an embodiment of lithium ion battery of the present utility model, with reference to Fig. 4 and Fig. 5, insulated metal structure 2 can be set directly at the original position of negative electrode diaphragm 112 of cathode sheet 11 to the original position of the anode diaphragm 122 of the surface between ultimate position (with reference to Fig. 4) and/or anode pole piece 12 to the surface between ultimate position (with reference to Fig. 5), the thickness sum of cathode sheet 11 surfaces at these insulated metal structure 2 place or the negative electrode diaphragm 112 on anode pole piece 12 surfaces or the thickness of anode diaphragm 122 and insulated metal structure 2 is less than or equal to the thickness of the negative electrode diaphragm 112 on cathode sheet 11 surfaces that are not provided with insulated metal structure 2 or the anode diaphragm 122 on anode pole piece 12 surfaces.
According in an embodiment of lithium ion battery of the present utility model, the edge of each insulated metal structure 2 does not exceed the corresponding cathode sheet 11 of battery core 1 or the surperficial edge of anode pole piece 12 (along the direction vertical with the paper of Fig. 1).
In an embodiment of insulated metal structure 2, the thickness of insulated metal structure 2 is 90 μ m～300 μ m.In another embodiment, the thickness that is arranged on the upper surface of sheet metal 21 and the insulating barrier of lower surface 22 is respectively 15 μ m～30 μ m, and the thickness of sheet metal 21 is 60 μ m～270 μ m.
According in an embodiment of lithium ion battery of the present utility model, the metal structure that certainly insulate 2 to the distance on battery core 1 surface is 1/4～3/4 of battery core 1 thickness.Preferably, metal structure 2 to the distance on battery core 1 surface that certainly insulate is 1/2 of battery core 1 thickness.
According in lithium ion battery of the present utility model, battery core 1 can be takeup type battery core, lamination type electric core, a part for stacked another part be a kind of in takeup type battery core.
Finally provide embodiment, comparative example and test result according to lithium ion battery of the present utility model.
The preparation of A cathode sheet 11
According to the manufacture method of conventional lithium ion battery and operation, by cobalt acid lithium (LiCoO
2), conductive carbon, binding agent Kynoar (PVDF) add in 1-METHYLPYRROLIDONE (NMP) mixing and stirring to make active material of cathode slurry with mass ratio 96:2:2 to be coated on positive and negative two surfaces of the cathode current collector aluminium foil that 12 μ m are thick, carry out afterwards roll-in, oven dry, cutting, become cathode sheet.
The preparation of B anode pole piece 12
With mass ratio 95.7:1:3.1:0.2, add mixing and stirring in deionized water to make active material of positive electrode slurry graphite, conductive carbon, binding agent butadiene-styrene rubber, thickener sodium carboxymethylcellulose (CMC), active material of positive electrode slurry is coated on positive and negative two surfaces of the anode collector Copper Foil that 8 μ m are thick, carry out afterwards roll-in, oven dry, cutting, become anode pole piece.
The preparation of C barrier film 13
Adopt polypropylene (PP) barrier film of 16 μ m.
The preparation of D battery core 1
Adopt the preparation of takeup type technique, it is 1/2 place of battery core 1 thickness that insulated metal structure 2 is placed on to the distance on battery core 1 surface, be placed on the initiating terminal place of coiling battery core and this locates corresponding anode pole piece 12 without diaphragm (with reference to Fig. 1), and the diaphragm thickness of the cathode sheet at other place is 180 μ m, the diaphragm thickness of anode pole piece is 120 μ m, the thickness of insulated metal structure 2 is 90 μ m, wherein, insulating barrier 22 is nylon layer, the thickness of monolayer insulating layer 22 is 15 μ m, sheet metal 21 is steel disc, the thickness of sheet metal 21 is 60 μ m, insulated metal structure 2 is a cuboid, and its edge is no more than the surperficial edge (along the direction vertical with the paper of Fig. 1) of anode pole piece 12.
The preparation of E lithium ion battery
The naked battery core that takeup type technique is made packs in the packaging bag that aluminum plastic film makes, and injects electrolyte, with lithium hexafluoro phosphate (LiPF in packaging bag
6) be lithium salts, vinyl carbonate (EC) and propylene carbonate (PC), dimethyl carbonate (DMC), the mass ratio of methyl acetic acid ester (MA) is 1:1:2:1, form electrolyte, again through changing into, the technique such as ageing, exhaust, shaping makes lithium ion battery, capacity is 4.0Ah, and voltage range is 3.0～4.35V.
Except for the following differences, all the other are with embodiment 1.
Difference from Example 1 is, at step D(, is the preparation of battery core 1) in, the thickness of the insulated metal structure 2 in embodiment 2 is 150 μ m, and wherein, the thickness of monolayer insulating layer 22 is 20 μ m, and the thickness of sheet metal 21 is 110 μ m.
Embodiment 3
Except for the following differences, all the other are with embodiment 1.
Difference from Example 1 is, at step D(, is the preparation of battery core 1) in, the thickness of the insulated metal structure 2 in embodiment 3 is 200 μ m, and wherein, the thickness of monolayer insulating layer 22 is 20 μ m, and the thickness of sheet metal 21 is 160 μ m.
Embodiment 4
Except for the following differences, all the other are with embodiment 1.
Difference from Example 1 is, at step D(, is the preparation of battery core 1) in, the thickness of the insulated metal structure 2 in embodiment 4 is 250 μ m, and wherein, the thickness of monolayer insulating layer 22 is 20 μ m, and the thickness of sheet metal 21 is 210 μ m.
Embodiment 5
Except for the following differences, all the other are with embodiment 1.
Difference from Example 1 is, at step D(, is the preparation of battery core 1) in, the thickness of the insulated metal structure 2 in embodiment 5 is 300 μ m, and wherein, the thickness of monolayer insulating layer 22 is 20 μ m, and the thickness of sheet metal 21 is 260 μ m.
Embodiment 6
The preparation of A cathode sheet 11
With embodiment 1.
The preparation of B anode pole piece 12
With embodiment 1.
The preparation of C barrier film 13
With embodiment 1.
The preparation of D battery core 1
Adopt stacked technique preparation, it is 1/2 place of battery core 1 thickness that insulated metal structure 2 is placed on to the distance on battery core 1 surface, and the diaphragm thickness of corresponding cathode sheet 11 is 1/2 of other pole piece diaphragm thickness, i.e. 90 μ m, the thickness of insulated metal structure 2 is for being also 90 μ m.Wherein, the thickness of monolayer insulating layer 22 is 15 μ m, and the thickness of sheet metal 21 is 60 μ m.
The preparation of E lithium ion battery
The naked battery core that stacked technique is made packs in the packaging bag that aluminum plastic film makes, and injects electrolyte, with lithium hexafluoro phosphate (LiPF in packaging bag
6) be lithium salts, vinyl carbonate (EC) and propylene carbonate (PC), dimethyl carbonate (DMC), the mass ratio of methyl acetic acid ester (MA) is 1:1:2:1, form electrolyte, again through changing into, the technique such as ageing, exhaust, shaping makes lithium ion battery, capacity is 4.0Ah, and voltage range is 3.0～4.35V.
Embodiment 7
The preparation of A cathode sheet 11
With embodiment 1.
The preparation of B anode pole piece 12
With embodiment 1.
The preparation of C barrier film 13
With embodiment 1.
The preparation of D battery core 1
Adopt the preparation of stacked and takeup type group technology, it is 1/2 place of battery core 1 thickness that insulated metal structure 2 is placed on to the distance on battery core 1 surface, and corresponding anode pole piece is without diaphragm, and the thickness of insulated metal structure 2 is 100 μ m.Wherein, the thickness of monolayer insulating layer 22 is 20 μ m, and the thickness of sheet metal 21 is 60 μ m.
The preparation of E lithium ion battery
The naked battery core that stacked and takeup type group technology are made packs in the packaging bag that aluminum plastic film makes, and injects electrolyte, with lithium hexafluoro phosphate (LiPF in packaging bag
6) be lithium salts, vinyl carbonate (EC) and propylene carbonate (PC), dimethyl carbonate (DMC), the mass ratio of methyl acetic acid ester (MA) is 1:1:2:1, form electrolyte, again through changing into, the technique such as ageing, exhaust, shaping makes lithium ion battery, capacity is 4.0Ah, and voltage range is 3.0～4.35V.
Comparative example 1
Difference from Example 1 is, at step D(, is the preparation of battery core 1) in, naked metal structure 2, all the other are with embodiment 1.
Comparative example 2
Difference from Example 6 is, at step D(, is the preparation of battery core 1) in, naked metal structure 2, all the other are with embodiment 6.
Comparative example 3
Difference from Example 7 is, at step D(, is the preparation of battery core 1) in, naked metal structure 2, all the other are with embodiment 7.
Provide the test process of embodiment 1-7 and comparative example 1-3 below.
(1) multiplying power test:
Respectively battery core in comparative example and embodiment is carried out to multiplying power test, multiplying power test condition is: under room temperature, adopt 0.5C to charge, then, respectively with the discharge-rate electric discharge of 0.2C and 1.5C, charging/discharging voltage scope is: 3.0-4.2V.
(2) bending power test:
Respectively battery core in comparative example and embodiment is bent to test, bending condition is: an External Force Acting, in battery core side, and is exerted pressure downwards, can stop, and record the now stressed size of battery core until battery core is bent downwardly 10 degree.Test quantity is 1000 every group.
(3) impact test:
Respectively battery core in comparative example and embodiment is carried out to impact test, shock condition is: battery core 0.5C is completely charged to 4.2V, then battery core is placed in a plane, the iron staff of one diameter 15.8mm is disposed across to the center of battery core, allows the quality be that the iron hammer of 9.1Kg drops into iron staff from the height of 61 ± 2.5cm.Test quantity is 1000 every group.
Table 1 provides the test result of embodiment 1-7 and comparative example 1-3.
The test result of table 1 embodiment 1-7 and comparative example 1-3
As can be seen from Table 1, while adopting same structure, chemical property difference is little, for example, embodiment 1-5 all adopts winding-structure, compares with the comparative example 1 with identical winding-structure, adds after insulated metal structure 2, at room temperature test 1.2C discharge-rate performance (0.2C discharge capacity is as benchmark), result shows that high rate performance affects not quite substantially; Equally, embodiment 6 and embodiment 7 adopt respectively lamination, lamination and coiling combining structure, compare respectively with the comparative example 2 with same structure with comparative example 3, and adding of insulated metal structure 2 do not affect its high rate performance yet.
Comparison for mechanical performance and security performance, can be as seen from Table 1, after adding insulated metal structure 2, mechanical performance and the security performance of battery core are all improved significantly, and along with the increase of the thickness of sheet metal 21, mechanical performance and security performance further improve, for example, in embodiment 1-5, compare with comparative example 1, the machinery intensity of battery core and shock safety test are along with the increase of sheet metal 21 thickness has raising significantly.
Fig. 7 is the lithium ion battery comparison diagram of cycle performance at room temperature in the lithium ion battery that makes of embodiment 4 and comparative example 1, and its endless form is that 0.5C discharges and recharges.As can be seen from the figure, add after insulated metal structure 2, the cycle performance of lithium ion battery is also unaffected, with the essentially no difference of cycle performance of lithium ion battery in comparative example 1.
Claims (10)
1. a lithium ion battery, comprising:
Battery core (1), comprising:
Cathode sheet (11), the lip-deep negative electrode diaphragm (112) that contains active material of cathode that comprises cathode current collector (111) and be arranged on cathode current collector (111);
Anode pole piece (12), the lip-deep anode diaphragm (122) that contains active material of positive electrode that comprises anode collector (121) and be arranged on anode collector (121); And
Barrier film (13), is positioned between cathode sheet (11) and anode pole piece (12);
It is characterized in that, lithium ion battery also comprises:
At least one insulated metal structure (2), each insulated metal structure (2) is oppositely arranged on cathode sheet (11) in battery core (1) and/or the surface of anode pole piece (12);
Wherein, each insulated metal structure (2) comprising:
Sheet metal (21), its intensity is higher than the intensity of cathode current collector (111) and anode collector (121); And
Insulating barrier (22), covers upper surface and the lower surface of sheet metal (21).
2. lithium ion battery according to claim 1, is characterized in that,
Sheet metal (21) is selected from a kind of in steel disc, iron plate, chromium sheet, platinized platinum, titanium alloy sheet, manganese alloy sheet;
Insulating barrier (22) is nylon layer.
3. lithium ion battery according to claim 1, is characterized in that, the edge of each insulated metal structure (2) is coated with thermoplastic polyester insulating cement.
4. lithium ion battery according to claim 1, it is characterized in that, when battery core (1) is takeup type battery core, an insulated metal structure (2) be oppositely arranged on takeup type battery core initiating terminal place the cathode sheet without negative electrode diaphragm (112) (11) surface or do not there is the surface of the anode pole piece (12) of anode diaphragm (122), the thickness of this insulated metal structure (2) is less than or equal to the thickness sum of negative electrode diaphragm (112) Yu the anode diaphragm (122) of battery core (1).
5. lithium ion battery according to claim 1, it is characterized in that, the original position of negative electrode diaphragm (112) that an insulated metal structure (2) is set directly at cathode sheet (11) to the surface between ultimate position and/or the original position of the anode diaphragm (122) of anode pole piece (12) to the surface between ultimate position, the negative electrode diaphragm (112) on cathode sheet (11) surface at this insulated metal structure (2) place or anode pole piece (12) surface or the thickness of anode diaphragm (122) and the thickness sum of insulated metal structure (2) are less than or equal to the thickness of the negative electrode diaphragm (112) on cathode sheet (11) surface that is not provided with insulated metal structure (2) or the anode diaphragm (122) on anode pole piece (12) surface.
6. lithium ion battery according to claim 1, is characterized in that, the edge of each insulated metal structure (2) does not exceed the corresponding cathode sheet (11) of battery core (1) or the surperficial edge of anode pole piece (12).
7. lithium ion battery according to claim 1, is characterized in that, the thickness of insulated metal structure (2) is 90 μ m～300 μ m.
8. lithium ion battery according to claim 7, is characterized in that, the thickness that is arranged on the upper surface of sheet metal (21) and the insulating barrier (22) of lower surface is respectively 15 μ m～30 μ m, and the thickness of sheet metal (21) is 60 μ m～270 μ m.
9. lithium ion battery according to claim 1, is characterized in that, the metal structure that certainly insulate (2) to the distance on battery core (1) surface is 1/4～3/4 of battery core (1) thickness.
10. lithium ion battery according to claim 9, is characterized in that, the metal structure that certainly insulate (2) to the distance on battery core (1) surface is 1/2 of battery core (1) thickness.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320800920.2U CN203574063U (en) | 2013-12-05 | 2013-12-05 | Lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320800920.2U CN203574063U (en) | 2013-12-05 | 2013-12-05 | Lithium ion battery |
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| CN203574063U true CN203574063U (en) | 2014-04-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106058296A (en) * | 2016-08-05 | 2016-10-26 | 东莞新能源科技有限公司 | Secondary battery cell |
| CN115275460A (en) * | 2022-08-30 | 2022-11-01 | 宁德新能源科技有限公司 | A battery cell Battery and electric equipment |
| WO2023283847A1 (en) * | 2021-07-14 | 2023-01-19 | 宁德时代新能源科技股份有限公司 | Electrode assembly, processing method and apparatus, battery cell, battery, and electronic device |
-
2013
- 2013-12-05 CN CN201320800920.2U patent/CN203574063U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106058296A (en) * | 2016-08-05 | 2016-10-26 | 东莞新能源科技有限公司 | Secondary battery cell |
| WO2023283847A1 (en) * | 2021-07-14 | 2023-01-19 | 宁德时代新能源科技股份有限公司 | Electrode assembly, processing method and apparatus, battery cell, battery, and electronic device |
| CN115275460A (en) * | 2022-08-30 | 2022-11-01 | 宁德新能源科技有限公司 | A battery cell Battery and electric equipment |
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