CN101083344B - Lithium ion secondary battery and manufacture method - Google Patents
Lithium ion secondary battery and manufacture method Download PDFInfo
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- CN101083344B CN101083344B CN2006100834564A CN200610083456A CN101083344B CN 101083344 B CN101083344 B CN 101083344B CN 2006100834564 A CN2006100834564 A CN 2006100834564A CN 200610083456 A CN200610083456 A CN 200610083456A CN 101083344 B CN101083344 B CN 101083344B
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- composite membrane
- supporter
- shell
- hole
- rechargeable battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention provides a lithium ion secondary battery, which includes the core, the electrolyte as well as the outer covering of the accommodation core and the electrolyte, the outer covering is the compound membrane, of which the battery also includes the support body which attaches on the compound membrane outer covering and the through hole which sealed by the seal body sets on the together support body and compound membrane. The invention also provides the preparation method of the lithium ion secondary battery. In the preparation process of the lithium ion secondary battery, the produced gas when the battery converts may discharges from through hole which fits on the together support body and the compound membrane, no need to establish the reservation space, reduced the compound membrane quantity which each battery uses, and has omitted the working procedure of establishment and the excision reservation space, therefore reduced the production cost of the lithium ion secondary battery.
Description
Technical field
The invention relates to a kind of lithium rechargeable battery and preparation method thereof.
Background technology
Lithium rechargeable battery has that specific energy height, operating voltage height, self-discharge rate are low, advantage such as have extended cycle life, therefore progressively replaced traditional nickel every alkaline secondary cells such as, ni-mhs, at modern mobile electronic device and communication apparatus, as having obtained extensive use in mobile phone, notebook computer, PDA(Personal Digital Assistant), small-sized camera, digital camera, portable DVD player/VCD and the MP3 player.
Lithium rechargeable battery generally comprises pole piece, electrolyte and holds pole piece and the shell of electrolyte.The thickness of traditional shell of being made by metal material is thicker, and occupation space is bigger.In order to overcome this defective of metal shell, use the MULTILAYER COMPOSITE membrane material formed by macromolecule membrane and metal forming shell in recent years as lithium rechargeable battery, this shell has lighter weight, size design and higher energy density more flexibly, has therefore obtained development rapidly.
For example, CN1173428C discloses a kind of manufacture method of thin type lithium ion battery, comprises the following steps: that 1. cell device is made, and comprises the multilayer complex films shell that positive and negative electrode, lug, barrier film, battery, macromolecule membrane and metal forming are formed; 2. battery pre-assembled; 3. battery changes into; 4. vacuum seal and packing; It is characterized in that 1. described step comprises that the punching press composite membrane forms the battery container, and used composite membrane is bigger than coating the required composite membrane of battery fully, the part of coming out greatly forms headspace, and headspace one side is provided with little opening.
Owing in the battery formation process, can produce gas, as HF, CO and CO
2, therefore in above-mentioned manufacture method, when preparation composite membrane shell, the gas that headspace holds generation need be set, need headspace is excised after changing into.The material that constitutes headspace is the composite membrane the same with property material for battery shell, and the setting of headspace increases the composite membrane amount of each battery consumption, and the cost of each used in battery composite membrane accounts for more than 15% of the total material cost of battery, even more than 20%.And the complex procedures of the setting of headspace and excision, the production cost height.
Summary of the invention
The objective of the invention is provides low lithium rechargeable battery of a kind of production cost and preparation method thereof in order to overcome existing employing composite membrane as the high shortcoming of the production cost of the lithium rechargeable battery of shell.
The invention provides a kind of lithium rechargeable battery, this battery comprises pole piece, electrolyte and holds pole piece and the shell of electrolyte, described shell is a composite membrane, wherein, described battery also comprises supporter, this supporter is fitted on the composite membrane shell, on supporter that fits together and the composite membrane through hole is arranged, and described through hole is sealed by seal.
The invention provides a kind of preparation method of lithium rechargeable battery, this method comprises with composite membrane and prepares shell, pole piece and electrolyte are put in the shell, and battery is changed into, wherein, the process of preparation shell comprises described composite membrane and supporter is fit together, and on supporter that fits together and composite membrane through hole is set, composite membrane is folded up, and with two overlapping side involutions of composite membrane; Behind the composite membrane involution with cover top portion, battery is changed into, seal described through hole with seal then.
In the preparation process of lithium rechargeable battery provided by the invention, the gas that produces when battery changes into can be discharged from the supporter and the through hole on the composite membrane that fit together, do not need to be provided with headspace, reduced the amount of the composite membrane of each used in battery, and saved the operation that is provided with and excises headspace, therefore reduced the production cost of lithium rechargeable battery.
Description of drawings
Fig. 1 is the process schematic diagram according to the preparation shell of first kind of execution mode of the present invention;
Fig. 2 is the process schematic diagram according to the preparation shell of second kind of execution mode of the present invention;
Fig. 3 is the process schematic diagram according to the preparation shell of the third execution mode of the present invention;
Fig. 4 is the schematic diagram of expression lithium rechargeable battery manufacture method of the present invention;
Fig. 5 is the structural representation of the lithium rechargeable battery that provides of battery of the present invention.
Description of reference numerals:
1: composite membrane 2: supporter
3: through hole 4: overlapping side
5: groove 6: cover top portion
7: pole piece 8: positive and negative conducting terminal
9: seal
Embodiment
Lithium rechargeable battery provided by the invention comprises pole piece, electrolyte and holds pole piece and the shell of electrolyte, described shell is a composite membrane, wherein, described battery also comprises supporter, this supporter is fitted on the composite membrane shell, on supporter that fits together and the composite membrane through hole is arranged, described through hole is sealed by seal.
According to lithium rechargeable battery provided by the invention, wherein, described supporter is preferably plate body, and the shape of plate body can be square shape, cuboid, cylindrical or other is irregularly shaped.Make for convenience and use, the shape of plate body is preferably cuboid.The thickness of plate body is greater than the gross thickness of described composite membrane, and for example the thickness of plate body is the 0.5-5 millimeter, is preferably the 1-4 millimeter.
Supporter can be made by existing various materials, for example metal or plastics.Supporter is preferably plastics, plastics be can with the material of the mutual welding of composite membrane internal layer, be preferably polyolefin.Polyolefin is selected from polypropylene (PP), polyethylene (PE), high density polyethylene (HDPE) (HDPE), low density polyethylene (LDPE) (LDPE), polyvinyl chloride (PVC) and polystyrene (PS), perhaps at least 2 kinds mixture in them.
Supporter can be positioned at other any position except that the shell involution, preferably is fitted in the bottom of shell.Supporter can be fitted in the inner surface or the outer surface of outer casing bottom, preferably at inner surface.
There is no particular limitation to the supporter that fits together and shape, size and the quantity of the through hole on the composite membrane in the present invention.The number of described through hole is 1-5, is preferably 1-2.Through hole can be circular hole, square hole or other erose hole, and in order to make with easy to use, through hole is preferably circular hole.The size of through hole is relevant with the capacity of battery, and when battery capacity was big, through hole was bigger; When battery capacity hour, through hole is less.Generally speaking, the area of section of through hole is the 0.5-5.0 square millimeter, is preferably the 1.0-4.0 square millimeter.Through hole can be positioned at any position of supporter, is preferably placed at the middle part of supporter.
Described seal matches with described through hole, plays the effect of sealing through hole.The shape of seal is identical with described through hole with quantity.The material of seal can be polymer or metal material, described polymer is a polyolefin, polyolefin is selected from polypropylene, polyethylene, high density polyethylene (HDPE), low density polyethylene (LDPE), polyvinyl chloride and polystyrene or at least 2 kinds mixture in them, and described metal material is aluminium, steel, copper, nickel or at least 2 kinds alloy in them.
The mode that seal seals described through hole includes but not limited to following dual mode: when the material of seal is polymer, by semi-vitreous polymer is injected through hole, seal and supporter are bonded together; When the material of seal is metal material, but the sectional dimension that the cross sectional shape of seal and the sectional dimension of the identical seal of cross sectional shape of through hole are a bit larger tham through hole, after getting into seal in the through hole, because supporter makes seal and supporter be closely linked to the centripetence power of seal.
Described composite membrane can be the composite membrane that is used to make the lithium rechargeable battery shell of routine.Composite membrane is generally the composite membrane of being made up of polymer film and metal forming more than three layers or three layers.Polymer film and the metal forming composition composite membrane that can combine by the mode of routine, for example mode by dry-pressing, hot pressing or injection mo(u)lding.
The internal layer of composite membrane is preferably one or more polymer that are selected from polyethylene, polypropylene and the modified polypropene, and the thickness of internal layer is preferably the 20-60 micron, more preferably the 25-50 micron; The intermediate layer is preferably aluminium foil, and the thickness in intermediate layer is preferably the 25-65 micron, more preferably the 30-60 micron; Skin is preferably nylon (NY) and/or PETG (PET), and outer field thickness is preferably the 5-40 micron, more preferably the 10-30 micron.The gross thickness of composite membrane is preferably the 50-165 micron, more preferably the 65-140 micron.
The inboard, a side of described shell or relative inboard, two sides are fluted, and described groove is used to hold pole piece.When the side of shell is fluted, can under the condition of using composite membrane of the same area, increase the inner volume of the shell of making.
Described pole piece and electrolyte have been conventionally known to one of skill in the art, can be commercially available or be prepared by known method to obtain.
Pole piece comprises positive plate, negative plate and is arranged on barrier film between the positive/negative plate.Can adopt mode well known in the art that positive plate, negative plate and barrier film are formed pole piece, for example can pass through takeup type or stacked.
Described positive plate can be commercially available, and also can adopt known method to prepare, and consisting of of described positive plate is conventionally known to one of skill in the art.In general, positive plate comprises positive electrode collector and coating and/or is filled in the positive electrode of described positive electrode collector.Positive plate also comprises anodal conducting terminal, and described anodal conducting terminal stretches out from the top of shell.Described positive electrode can contain positive active material, conductive agent and adhesive.
Described positive active material is not particularly limited, and can be the positive active material of the embedded removal lithium embedded of this area routine, one or more in the preferred following material: Li
xNi
1-yCoO
2(wherein, 0.9≤x≤1.1,0≤y≤1.0), Li
1+aM
bMn
2-bO
4(wherein ,-0.1≤a≤0.2,0≤b≤1.0, M is a kind of in lithium, boron, magnesium, aluminium, titanium, chromium, iron, cobalt, nickel, copper, zinc, gallium, yttrium, fluorine, iodine, the element sulphur), Li
mMn
2-nB
nO
2(wherein, B is a transition metal, 0.9≤m≤1.1,0≤n≤1.0).
Described conductive agent is not particularly limited, and can be the anodal conductive agent of this area routine, at least a such as in acetylene black, conductive carbon black and the electrically conductive graphite.Weight with positive active material is benchmark, and the content of described conductive agent is 1-15 weight %, is preferably 2-10 weight %.
The kind of described adhesive and content are conventionally known to one of skill in the art, for example one or more in fluorine resin and polyolefin compound such as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), the butadiene-styrene rubber (SBR).In general, according to the difference of adhesive therefor kind, be benchmark with the weight of positive active material, the content of adhesive is 0.01-8 weight %, is preferably 0.02-5 weight %.
Positive electrode collector can for example can use aluminium foil as positive electrode collector for positive electrode collector conventional in the lithium ion battery.
The preparation method of described positive plate can adopt conventional preparation method.For example, described positive active material, conductive agent and adhesive and solvent are made anode sizing agent, anode sizing agent is applied and/or is filled on the described collector body, drying, pressing mold or pressing mold not can obtain described positive plate.Wherein, described solvent can be selected from one or more in N-methyl pyrrolidone (NMP), dimethyl formamide (DMF), diethylformamide (DEF), dimethyl sulfoxide (DMSO) (DMSO), oxolane (THF) and water and the alcohols.The consumption of solvent can make anode sizing agent have viscosity and flowability, can be coated on the described collector body to get final product.In general the weight with positive active material is benchmark, and the content 5-70 weight % of described solvent is preferably 15-60 weight %.Wherein, drying, the method for pressing mold and condition are conventionally known to one of skill in the art.
Described negative plate can be commercially available, and also can adopt known method to prepare, and consisting of of described negative plate is conventionally known to one of skill in the art.In general, negative plate comprises negative electrode collector and coating and/or is filled in the negative material of described negative electrode collector.Negative plate also comprises the negative pole conducting terminal, and described negative pole conducting terminal stretches out from the top of shell.Described negative material contains negative electrode active material, conductive agent and adhesive.
Described negative electrode active material is not particularly limited, can disengage the negative electrode active material of lithium for embedding of this area routine, such as in native graphite, Delanium, petroleum coke, organic cracking carbon, carbonaceous mesophase spherules, carbon fiber, ashbury metal, the silicon alloy one or more, preferred natural graphite.
The kind of described adhesive and content are conventionally known to one of skill in the art, for example one or more in fluorine resin and polyolefin compound such as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), the butadiene-styrene rubber (SBR).Weight with described negative electrode active material is benchmark, and the content of described adhesive is 0.01-8 weight %, is preferably 0.02-5 weight %.
Described conductive agent is not particularly limited, and can be the cathode conductive agent of this area routine, at least a such as in acetylene black, conductive carbon black and the electrically conductive graphite.Weight with negative electrode active material is benchmark, and the content of described conductive agent is 1-15 weight %, is preferably 2-10 weight %.
Negative electrode collector can for example can use Copper Foil as negative electrode collector for negative electrode collector conventional in the lithium ion battery.
The preparation method of described negative pole can adopt conventional preparation method.For example, negative electrode active material, conductive agent and adhesive and solvent are made cathode size, cathode size is applied and/or is filled on the described collector body, drying, pressing mold or pressing mold not can obtain described negative pole.Wherein, described solvent can be selected from one or more in N-methyl pyrrolidone (NMP), dimethyl formamide (DMF), diethylformamide (DEF), dimethyl sulfoxide (DMSO) (DMSO), oxolane (THF) and water and the alcohols, is preferably water.The consumption of solvent can make described pastel have viscosity and flowability, can be coated on the described collector body to get final product.In general, be benchmark with the weight of negative electrode active material, the consumption of described solvent is 100-150%.Wherein, drying, the method for pressing mold and condition are conventionally known to one of skill in the art.
Described electrolyte can be nonaqueous electrolytic solution well known in the art or gel electrolyte.Described nonaqueous electrolytic solution is the mixed solution of electrolyte lithium salt and nonaqueous solvents, and electrolyte lithium salt is selected from lithium hexafluoro phosphate (LiPF
6), in lithium perchlorate, LiBF4, hexafluoroarsenate lithium, lithium halide, chlorine lithium aluminate and the fluorocarbon based sulfonic acid lithium one or more.Organic solvent is selected chain acid esters and ring-type acid esters mixed solution for use, wherein the chain acid esters can be dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), carbonic acid first propyl ester (MPC), dipropyl carbonate (DPC) and other are fluorine-containing, sulfur-bearing or contain at least a in the chain organosilane ester of unsaturated bond, the ring-type acid esters can be ethylene carbonate (EC), propene carbonate (PC), vinylene carbonate (VC), gamma-butyrolacton (γ-BL), sultone and other are fluorine-containing, sulfur-bearing or contain at least a in the ring-type organosilane ester of unsaturated bond.The injection rate of electrolyte is generally 1.5-4.9g/Ah, the concentration of electrolyte be generally 0.5-2.9 rub/liter.
The preparation method of lithium rechargeable battery provided by the invention comprises with composite membrane and prepares shell, pole piece and electrolyte are put in the shell, and battery is changed into, wherein, the process of preparation shell comprises described composite membrane and supporter is fit together, on supporter that fits together and composite membrane, through hole is set, composite membrane is folded up, and with two overlapping side involutions of composite membrane; Behind the composite membrane involution with cover top portion, battery is changed into, seal described through hole with seal then.
The preparation method of lithium rechargeable battery provided by the invention is described in more detail below in conjunction with accompanying drawing.
Fig. 1 is the process schematic diagram according to the preparation shell of first kind of execution mode of the present invention.As shown in Figure 1, at the applying supporter 2 of described composite membrane 1, on supporter 2 that fits together and composite membrane 1, through hole 3 is set; Composite membrane 1 folded up and together 1 two overlapping side 4 involutions of composite membrane.
Before supporter 2 is set, composite membrane 1 can be cut into rectangle as shown in Figure 1.
There is no particular limitation to the method for applying supporter 2, for example, can utilize adhesive that supporter 2 is bonded on the composite membrane 1, perhaps supporter 2 and composite membrane 1 is welded together.When supporter 2 is plastic plate, preferably supporter 2 and composite membrane 1 are welded together.Can adopt heating or hyperacoustic mode to carry out welding, heating-up temperature is 160-220 ℃, is preferably 180-200 ℃, and be 1-5 second heating time, is preferably 2-4 second; Frequency of ultrasonic is the 18-22 kilohertz, is preferably the 19-21 kilohertz, and ultrasonic time is 1-5 second, is preferably 2-4 second.Supporter 2 preferably is fitted in the middle part of composite membrane 1.
Can adopt known various drilling methods on supporter 2 that is fitting together and composite membrane 1, through hole 3 to be set,, for example can use the punching die punching as long as the shape of through hole 3 and size are met the requirements.
When composite membrane is folded up,, make supporter 1 place the bottom preferably with the doubling of composite membrane two sides.After the composite membrane 1 two sides doubling, can make supporter 1 place bottom inside, also can make supporter 1 place bottom outside, preferably make supporter 1 place bottom inside.
There is no particular limitation to the method with 1 two overlapping side 4 involutions of composite membrane, for example, can adopt heating or hyperacoustic mode to carry out involution, and heating-up temperature is 160-220 ℃, is preferably 180-200 ℃, and be 1-5 second heating time, is preferably 2-4 second; Frequency of ultrasonic is the 18-22 kilohertz, is preferably the 19-21 kilohertz, and ultrasonic time is 1-5 second, is preferably 2-4 second.
Fig. 2 is the process schematic diagram according to the preparation shell of second kind of execution mode of the present invention.The difference of second kind of execution mode and first kind of execution mode is, before applying supporter 2, one side also be included in the step that groove 5 is set of composite membrane 1.Wherein, the length of groove 5 is preferably the 25-45% of composite membrane length less than half of the length of composite membrane 1; The width of groove 5 is preferably the 60-90% of composite membrane width less than the width of composite membrane 1; The degree of depth of groove 5 is the 0.5-8 millimeter, is preferably the 1-5 millimeter.
There is no particular limitation to method that groove 5 is set, for example can use diel to go out groove 5 on composite membrane 1.The thickness of composite membrane generally is controlled at preceding more than 70% of composite membrane thickness of punching press after the punching press, can prevent in the process of groove is set the composite membrane punching press is saturating like this.
Fig. 3 is the process schematic diagram according to the preparation shell of the third execution mode of the present invention; The difference of the third execution mode and second kind of execution mode is, at the another side of composite membrane 1 groove 5 is set also.Wherein, the length sum of two grooves 5 is preferably the 50-80% of composite membrane length less than the length of composite membrane 1; The width of each groove 5 is preferably the 60-80% of composite membrane width less than the width of composite membrane 1; The degree of depth of each groove 5 is the 0.5-8 millimeter, is preferably the 1-5 millimeter.
Fig. 4 is the schematic diagram of expression lithium rechargeable battery manufacture method of the present invention.As shown in Figure 4, the manufacture method of battery comprises to be put pole piece 7 and electrolyte in the shell that makes according to the method described above into, and the composite membrane involution with cover top portion 6 changes into battery, then with the described through hole 3 of seal 9 sealings.
The structure of described pole piece 7 and manufacture method have been done detailed description before, do not repeat them here.
Electrolyte can be injected into from the top of shell the shell, also can be injected in the shell by described through hole.Under the preferable case, after the composite membrane involution with cover top portion 6, inject electrolyte by through hole 3.
Can adopt with the method that 1 two overlapping side 4 involutions of composite membrane method together is identical composite membrane involution that cover top portion 6 is overlapping together.
Wherein, when the composite membrane involution that cover top portion 6 is overlapping was together, anodal conducting terminal 8 and negative pole conducting terminal 8 stretched out from the top of shell respectively, and with the overlapping composite membrane involution of cover top portion 6 together.
Before battery is changed into, seal up described through hole with adhesive tape.Can change under the condition that changes into of routine, there is no particular limitation to this.The electric current that changes into is 0.01C-0.5C, is preferably 0.04C-0.2C, and the time of changing into is 5-20 hour, is preferably 7-14 hour.Have gas and produce in formation process, behind the atmospheric pressure of gas pressure intensity greater than outside batteries of inside battery, the gas pressure intensity of inside battery can be washed the adhesive tape of through-hole surfaces open, so gas is discharged to outside batteries by through hole.
After changing into, remove described adhesive tape, can obtain lithium rechargeable battery as shown in Figure 5 provided by the invention with the described through hole 3 of seal 9 sealings.
This embodiment is used to illustrate lithium rechargeable battery provided by the invention and preparation method thereof.
(1) manufacturing of shell
As shown in Figure 1, constituting PET/NY/ aluminium foil/PP, thickness is that 116 microns composite membrane cuts into the rectangle composite membrane 1 that is of a size of 45 * 124 millimeters, 190 ℃ of down heating 2 seconds, with supporter 2 (be of a size of 25 * 3 * 3 millimeters, make) welding by the PP plastics at the inboard positive middle part of film.On supporter 2 that is welded together and composite membrane 1, get out through hole 3 (bore dia is 1.5 millimeters a circular hole).Composite membrane 1 two sides doubling, make supporter 2 place the bottom.Heated 3 seconds down at 190 ℃, with composite membrane two overlapping side 4 involutions together, the cover top portion 6 relative with supporter reserved not involution.
(2) manufacturing of pole piece
100 weight portion LiCO
2, 4 weight portion acetylene black conductive agents, 5 weight portion PVDF adhesives and 60 weight portion nmp solvents mix and stir into slurry.This slurry coating on two surfaces of the aluminium foil of 0.02 millimeters thick, is cut into 52 * 360 millimeters strip after nmp solvent is removed in baking, be pressed into the positive plate of 130 micron thickness at last, wherein this positive plate contains 6.3 gram LiCoO
2
100 weight portion native graphites, 5 weight portion PVDF adhesives and 100 weight portion nmp solvents are mixed and stir into slurry.This slurry coating on two surfaces of the Copper Foil of 0.012 millimeters thick, is cut into 53 * 325 millimeters strip after nmp solvent is removed in baking, be pressed into the negative plate of 140 micron thickness at last, wherein this negative plate contains 3.0 gram native graphites.
Is thickness that 20 microns PE barrier film cuts into 55 * 740 millimeters strip barrier film.
Be wound into outside dimension after barrier film, positive plate and negative plate stacked by the order of barrier film/negative plate/barrier film/positive plate and be 3.2 * 33 * 55 millimeters pole piece.
(3) manufacturing of battery
As shown in Figure 4, pole piece 7 is put into the shell that step (1) makes from cover top portion 6 opening parts, positive and negative conducting terminal 8 is stretched out from cover top portion.190 ℃ of down heating 3 seconds, together the overlapping composite membrane of cover top portion 6 and positive and negative conducting terminal 8 involutions.Through hole 3 from outer casing bottom supporter 2 injects nonaqueous electrolytic solution (being added to 300 ml of EC, 300 milliliters of DEC and 400 milliliters of DMC by 1 mole of LiPF6 makes) with the amount of 3g/Ah.With transparent rubberized fabric through hole 3 is touched, use little electric current (80mA) constant current charge of 0.1C to change in 10 hours then, the gas that produces in formation process is emerged from circular hole.After changing into end, remove transparent rubberized fabric, seal 9 (steel ball) is got in the through hole on the supporter 23, thereby through hole 3 is sealed up.Pass through flanging and partial volume operation at last, the capacity of obtaining is 800mAh, and outside dimension is 3.8 * 35 * 62 millimeters, lithium rechargeable battery as shown in Figure 5.
This embodiment is used to illustrate lithium rechargeable battery provided by the invention and preparation method thereof.
(1) manufacturing of shell
As shown in Figure 2, be that 116 microns composite membrane cuts into the rectangle composite membrane 1 that is of a size of 45 * 124 millimeters constituting PET/NY/ aluminium foil/PP, thickness, one side be 3.4 * 33 * 55 millimeters groove 5 in the inside dimension of going out of composite membrane 1 with diel.Heating 2 seconds down at 200 ℃, is the edge of groove 5 with supporter 2 (be of a size of 25 * 3 * 4 millimeters, made by the PP plastics) welding at the inboard positive middle part of film.On supporter 2 that is welded together and composite membrane 1, get out through hole 3 (bore dia is 2 millimeters a circular hole).Composite membrane 1 two sides doubling, make supporter 2 place the bottom.Heated 4 seconds down at 180 ℃, with composite membrane two overlapping side 4 involutions together, the cover top portion 6 relative with supporter reserved not involution.
(2) manufacturing of pole piece
Make pole piece according to the method identical with embodiment 1 step (2).
(3) manufacturing of battery
Make lithium rechargeable battery according to the method identical with embodiment 1 step (3).
This embodiment is used to illustrate lithium rechargeable battery provided by the invention and preparation method thereof.
(1) manufacturing of shell
As shown in Figure 3, constituting PET/NY/ aluminium foil/PP, thickness is that 116 microns composite membrane cuts into the rectangle composite membrane 1 that is of a size of 45 * 124 millimeters, and respectively going out an inside dimension on the both sides up and down of composite membrane 1 with diel is 1.7 * 33 * 55 millimeters groove 5.Heating is 2 seconds under 190 ℃, is between two grooves 5 with supporter 2 (be of a size of 25 * 3 * 2 millimeters, made by the PP plastics) welding at the inboard positive middle part of film.On supporter 2 that is welded together and composite membrane 1, get out through hole 3 (bore dia is 1 millimeter a circular hole).Composite membrane 1 two sides doubling, make supporter 2 place the bottom.Heated 3 seconds down at 190 ℃, with composite membrane two overlapping side 4 involutions together, the cover top portion 6 relative with supporter reserved not involution.
(2) manufacturing of pole piece
Make pole piece according to the method identical with embodiment 1 step (2).
(3) manufacturing of battery
Make lithium rechargeable battery according to the method identical with embodiment 1 step (3).
Claims (16)
1. lithium rechargeable battery, this battery comprises pole piece, electrolyte and holds pole piece and the shell of electrolyte, described shell is a composite membrane, it is characterized in that described battery also comprises supporter, this supporter is fitted on the composite membrane shell, on supporter that fits together and the composite membrane through hole is arranged, described through hole is sealed by seal, and described supporter is a plate body, and the thickness of plate body is the 0.5-5.0 millimeter.
2. lithium rechargeable battery according to claim 1, wherein, the area of section of described through hole is the 0.5-5.0 square millimeter.
3. lithium rechargeable battery according to claim 1, wherein, described plate body is a plastic plate.
4. lithium rechargeable battery according to claim 1, wherein, described supporter is fitted in the bottom of shell.
5. lithium rechargeable battery according to claim 1, wherein, described seal is polymer or metal material.
6. lithium rechargeable battery according to claim 5, wherein, described polymer is a polyolefin, described metal material is metal simple-substance or alloy.
7. lithium rechargeable battery according to claim 6, wherein, described polyolefin is selected from a kind of in polypropylene, polyethylene, polyvinyl chloride and the polystyrene or at least 2 kinds mixture in them.
8. lithium rechargeable battery according to claim 6, wherein, described metal material is aluminium, steel, copper, nickel or at least 2 kinds alloy in them.
9. lithium rechargeable battery according to claim 1, wherein, the inboard, a side of described shell or relative inboard, two sides are fluted.
10. the preparation method of a lithium rechargeable battery, this method comprises with composite membrane and prepares shell, pole piece and electrolyte are put in the shell, and battery is changed into, it is characterized in that the process of preparation shell comprises composite membrane and supporter are fit together, and on supporter that fits together and composite membrane through hole is set, composite membrane is folded up, and with two overlapping side involutions of composite membrane; Behind the composite membrane involution with cover top portion, battery is changed into, seal described through hole with seal then, described supporter is a plate body, and the thickness of plate body is the 0.5-5.0 millimeter.
11. method according to claim 10, wherein, supporter is fitted in the middle part of composite membrane; With the doubling of composite membrane two sides, supporter is positioned at the bottom of shell.
12. method according to claim 10, wherein, the area of section of described through hole is the 0.5-5.0 square millimeter.
13. method according to claim 10, wherein, described supporter is a plastic plate, adopts heating or hyperacoustic mode that described composite membrane and supporter are fit together, and heating-up temperature is 160-220 ℃, and be 1-5 second heating time; Frequency of ultrasonic is the 18-22 kilohertz, and ultrasonic time is 1-5 second.
14. method according to claim 10 wherein, adopts heating or hyperacoustic mode with two overlapping side involutions of composite membrane and with the composite membrane involution of cover top portion, heating-up temperature is 160-220 ℃, and be 1-5 second heating time; Frequency of ultrasonic is the 18-22 kilohertz, and ultrasonic time is 1-5 second.
15. method according to claim 10, wherein, in the composite membrane involution with cover top portion, the anodal conducting terminal and the negative pole conducting terminal of pole piece stretch out from the top of shell respectively, and with the composite membrane involution of cover top portion together.
16. method according to claim 10, wherein, before the applying supporter, one side a groove being set or a groove respectively being set at composite membrane on the both sides of composite membrane.
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| CN102005617A (en) * | 2009-08-28 | 2011-04-06 | 比克国际(天津)有限公司 | Lithium-dynamic battery capable of avoiding gas inflation |
| CN102569894B (en) * | 2010-12-14 | 2015-03-18 | 深圳市崧鼎实业有限公司 | Battery cell encapsulation method |
| CN102593527B (en) * | 2012-03-26 | 2014-03-26 | 西安瑟福能源科技有限公司 | Method for forming polymer lithium ion battery |
| KR102211365B1 (en) * | 2014-04-14 | 2021-02-03 | 삼성에스디아이 주식회사 | Secondary battery |
| CN104993144B (en) * | 2015-05-27 | 2018-11-02 | 广州鹏辉能源科技股份有限公司 | Lithium bromide-containing electrolyte and battery thereof |
| KR20170101120A (en) * | 2016-02-26 | 2017-09-05 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | Power storage device, battery management unit, and electronic device |
| CN106784555B (en) * | 2016-12-29 | 2019-04-09 | 桂林电器科学研究院有限公司 | A kind of high temperature resistant composite microporous separator and preparation method thereof |
| CN110444700B (en) * | 2019-07-19 | 2022-07-22 | 江门吉锂能源有限公司 | Packaging shell of ultrathin lithium battery and ultrathin lithium battery |
| CN116979124B (en) * | 2023-08-10 | 2024-05-28 | 浙江中泽精密科技股份有限公司 | Explosion-proof valve production process control method and system for battery aluminum shell |
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