CN101369674A - Safe high-energy folding case lithium ion battery and its production technology - Google Patents
Safe high-energy folding case lithium ion battery and its production technology Download PDFInfo
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Abstract
The invention relates to a joggled shell lithium ion battery that forms a composite battery shell with metal chaff and temperature-sensitive macromolecule. Five temperature and pressure safety valves are equipped on a metal/macromolecule composite joggled shell, which overcomes problem of present liquid state lithium ion battery and defects of polymer soft package batteries, and improves battery reliability. Compared with present liquid state metal shell lithium ion battery, the joggled shell lithium ion battery of the invention has volume improved 10% to 30%; compared with present polymer soft package batteries, the battery of the invention has volume improved 3% to 10% with tympanites and liquid leakage rate less than 0.1ppm. In addition, there is a little of joggled plate material, manufacturing device and mould being simple. Consumption of the materials and energy loss in process is less, which reduces cost, manufactures the battery adequately, meets need of the customers for various battery sizes and fills blank of super thin lithium ion battery field below 3.0mm.
Description
Technical field
The present invention relates to a kind of preparation method and production technology of novel secondary lithium battery.The compound folding shell of metal/high-molecular and the relief valve device of this lithium ion battery exploitation of innovation design and unique preparation, not only significantly strengthened the fail safe of battery, and improved battery capacity, and overcome the problem of the liquid lithium ionic cell that present technology produces and the various defectives of polyalcohol flexible packing battery, promoted the reliability of battery.This technology not only can production application in the digital battery of electronic products such as bluetooth, mobile phone, and can produce big capacity and high-power electrokinetic cell, be applied to electric motor car, aerospace or the like main equipment.
Folding case lithium ion battery of the present invention also can be described as the crust polymer lithium battery, and according to the different metal material that battery case uses, folding case lithium ion battery can also have different titles.For example, when using aluminum alloy materials, the aluminum metal folding case lithium ion battery can abbreviate the aluminium folding case lithium ion battery as, aluminium button box lithium ion battery or aluminium cover case lithium ion battery.When using stainless steel case, the stainless steel folding case lithium ion battery can abbreviate the steel folding case lithium ion battery as, steel button box lithium ion battery or steel bushing case lithium ion battery.
Background technology
At present, in consumer electronics and digital product field, mainly contain two kinds of lithium ion batteries: liquid lithium ionic cell and polyalcohol flexible packing lithium ion battery.Liquid lithium ionic cell uses stainless steel case or aluminum hull, liquid electrolyte solution.The polyalcohol flexible packing lithium ion battery uses aluminium/composite plastic film (aluminum-plastic composite membrane) as shell and polymer dielectric.These two kinds of lithium ion batteries are respectively at since 1993 and the large-scale production in 2000, with other battery (NI-G and Ni-MH battery) incomparable excellent performance captured many market segments rapidly, obtained swift and violent development.As high-tech new forms of energy product, liquid lithium ionic cell and polymer Li-ion battery have been widely used in mobile phone, notebook computer, palmtop PC, PDA(Personal Digital Assistant), Digital Video, digital camera, portable DVD player/VCD/CD and MP3 player etc., become various modern mobile communication equipments and the indispensable parts of electronic equipment, in moving, be engaged in for example office of various commercial activitys, management enterprise and in moving amusement many convenience are provided.But along with the renewal and the development of technology, have higher requirement to the mobile device power supply in market, for example thinner, lighter, arbitrary shape, more high-energy-density, safer and low price more.Liquid lithium ionic cell that prior art is produced and polyalcohol flexible packing lithium ion battery not only not only can not meet the demands aspect thin, light, arbitrary shape and the energy density, but also there are the following problems and defective:
(1) fail safe is relatively poor: the liquid lithium ionic cell security incidents such as burning of blasting have a large amount of report in all kinds of medium at home and abroad.A typical example is that in the international conference that Japan holds the accident that the Sony liquid lithium ionic cell explodes has taken place in October, 2006 in the Dell notebook computer, reflect the tip of the iceberg of liquid lithium ionic cell potential safety hazard.The liquid lithium ionic cell burning of blasting can cause personal injury and property loss, and Sony has paid more than 400,000,000 dollar cost for its security incident, the whole world its product passing through Ji reparations of going forward side by side of recalling.The blast generation of security incident such as burning of a large amount of liquid lithium ionic cells causes international airline tissue to implement to forbid or limit air transport for the lithium battery product, and International Power association (IEEE) formulates lithium battery production marketing and the use regulation of strictness more.Another typical example is, first mobile phone liquid lithium ionic cell blast of the whole world took place in China Gansu on June 19th, 2007 cause personnel death's accident, although battery of mobile phone is less, brisance is bigger, causes the victim to die instantly.Battery of mobile phone becomes bomb, and this time accident causes the great attention of national correlation department to the lithium battery fail safe.
Liquid lithium ionic cell blast the burning reason be that inside battery has used liquid electrolyte and outside batteries to use the rigid hard metal shell.When battery temperature raises, liquid electrolyte generating gasification, volumetric expansion great change, and improper chemical reaction takes place with battery material, produce a large amount of heat energy and huge air pressure at inside battery.The rigid hard metal shell of battery is when contending with the arrival critical value with inner pressure of battery, because of the huge air pressure that can't bear the inside battery sustainable growth is blasted.
Most of metal-back liquid lithium ionic cells are equipped the air pressure safety valves, but because the precision of air pressure safety valve is relatively poor, can not open valve under predetermined pressure, discharge inner pressure of battery, that is to say safety valve inefficacy or invalid.Therefore, even equipped the safety valve that prior art is produced, still blast security incidents such as burning of liquid lithium ionic cell.
(2) polyalcohol flexible packing lithium ion battery, owing to used soft aluminum-plastic composite membrane as shell, when inner pressure of battery increased, the mode that can the flexible housings distortion expands discharged it the battery so the safety that becomes.But the polyalcohol flexible packing lithium ion battery also has its problem and shortcoming: 1. soft and fragile aluminum-plastic composite membrane shell, and damage causes the rate of finished products in the production process lower easily, and production cost is higher; 2. raw material rely on from Japanese import, and price is more expensive, and material cost is higher; 3. aluminum-plastic composite membrane is in striking out the box operation, owing to stretched, internal layer CPP film sustains damage easily, causes box cancer defective to take place, and the box cancer will cause battery bulging and leakage lentamente; 4. the aluminum-plastic composite membrane shell adopts hot sealing, and fraction defective is higher, causes defectives such as battery bulging, leakage and shell breakage often to take place, not only cause battery failure, and the battery of bulging and leakage can damage the electronic devices and components around the battery, causes whole electronic installation to damage and inefficacy.
(3) metal shell of liquid lithium battery is thicker, battery capacity is lower: single face metal shell wall thickness is 0.25～0.3mm, thick 0.5～the 0.6mm that adds up to of two face-piece body walls, than the single face thickness 0.11mm of the aluminum-plastic composite membrane of polyalcohol flexible packing lithium battery, many 1～3 times of the thick 0.22mm of two facial masks.Using the same battery material and not changing under the prerequisite of electrode composition prescription, increase the loading of the active material in the battery, discharge capacity of the cell will increase in proportion.Therefore, under identical square size condition, metal-back liquid lithium battery lacks than the polyalcohol flexible packing lithium battery fills active cell material, thereby its battery capacity low 10%～30%.
(4) battery new product metal shell die sinking expense height, the cycle is long: along with the development in mobile communication, number and consumer electronics market, the requirement of the different overall dimensions of battery is emerged in an endless stream, all kinds of battery specifications are various in style.Square stainless steel case is to use the stainless steel tube of standard specification, stretched forming.If the size that battery user requires exceeds the standard specification scope of stainless steel tube, battery stainless steel case manufacturer will be unable to supply the shell of this specification.Square aluminum hull must pass through punching press → blanking → one-off drawing → succeeding stretch → three time → four multiple tracks complicated procedures of forming such as stretching → otch of stretching, finishes production process.The aluminum hull of a new spec model of every exploitation needs to drop into tens thousand of units to hundreds thousand of first moulds and takes the design of several weeks even several months and trial-production time.These have not only increased battery production merchant's new product development cost, and, in the face of fast changing market, in long cycle development time, reduced the market competitiveness of battery enterprise.
(5) thickness of metal-back lithium battery is because of the restriction of prior art, and can only produce the thickness specification is the above battery product of 3.0mm.For the slim or ultrathin lithium battery less than this thickness requirement, existing production Technology is difficult to realize.
Summary of the invention
The purpose that patent of the present invention will reach is to start with from the basic reason of analyzing liquid lithium ion battery explosion, solves safety problem on the key link of battery design and production.Not only to accomplish safer, more reliably, more low price and defective still less, but also to satisfy market for thinner, lighter, bigger capacity of battery and the more requirement of high-energy-density.
Patent of the present invention technical problem to be solved is with the metal-back of liquid lithium ionic cell (aluminum hull or stainless steel case) filming, and equips a plurality of safety valves at battery case.Rise the initial stage at battery temperature, before the bud that internal pressure has just been set up, safety problem took place, the gradation or start simultaneously in time of these safety valves was in time discharged inner pressure of battery and alleviates, and the accident of battery explosion and burning no longer takes place.
In order to realize the purpose of foregoing invention, the technical solution used in the present invention is: the metal shell filming, and with temperature sensitivity the temperature sensitive type macromolecular material is compound preferably, constitute the battery case composite component.Particularly, adopt metal (aluminium alloy or stainless steel) paper tinsel as property material for battery shell exactly, through die-cut and folding, the folding hull shape shape of preparation cost invention design uses temperature sensitive type macromolecule seal adhesive tape will roll over shell and cements and fix.Macromolecule seal adhesive tape and folding shell itself promptly are battery cases, it also is battery safety valve, when battery temperature rises, macromolecule seal adhesive tape meeting melted by heat, the dual side-edge edge of folding shell is dehisced or is separated, two planes of folding shell also can produce the stretcher strain bulging, inner pressure of battery are dredged and are discharged, battery so and the safety that becomes.
Technology contents of the present invention has three aspects:
First aspect, the Analysis on Mechanism of liquid lithium ionic cell explosive combustion.
Since being produced in batches for the first time by Sony corporation of Japan in 1993, in the history of more than ten years, the security incident of liquid lithium ionic cell is constant always from liquid lithium ionic cell.Many scientific papers, research report and patent of invention have been arranged, the mechanism of liquid towards lithium ion battery explosion burning is analyzed, and has proposed solution, and the part solution also implements in the battery product, and in market, sell, there are a large amount of customers using.Yet the accident of liquid lithium ionic cell explosive combustion still continues to take place, its odds ten thousand/to 1/10000000th between.The present invention is in order fundamentally to solve the problem of explosive combustion, and at first in the developing history of liquid towards lithium ion battery more than ten years, the essential characteristic that all security incidents take place is summarized as follows:
(1) generation of liquid lithium ionic cell product explosive combustion accident is regardless of the height of the size and the quality level of manufacturing enterprise.From the Sony corporation of Japan of world-class level, to the enterprise of indivedual individual workship of China, the accident that the lithium battery product that they are produced all can be blasted and be burnt, just the probability that takes place is different.
(2) under the crunch of market to higher battery capacity and lower unit price, battery production merchant constantly fills more cell active materials in limited enclosure volume, safe material (for example barrier film) and safe space in the extruding battery.Inside battery is short-circuited and overheated probability increase.
(3) for many years, the effort that solves the battery security problem concentrates on the materials chemistry aspect of battery always, and for example, the replacing of positive and negative electrode material and modification add flame-retardant additive etc. in electrolyte.And the physical features that never has battery carries out deep research and improvement.For example, conscientiously do not study the battery safety valve failure reasons, even many lithium battery manufacturers think that anyway battery safety valve often lost efficacy, therefore, the equipment safety valve is that a kind of ornaments and psychology are comforted on lithium battery, on product, do and see to the client.Under this battery design thought guidance, the safety valve of most of lithium battery products all is to furnish usefulness, does not play the safety anti-explosive effect in actual use.
(4) lithium cell safety valve of prior art production has two kinds of forms: a kind of is the indentation type, and another kind is a film-type.The indentation type is the position, a plane at the rectangular cell metal shell, engraves a kind of vestige that is similar in " one " font, " T " font, " X " font or " ψ " font with punching press or alternate manner.Indentation place metal-back is comparatively fragile, and when inner pressure of battery rose to the safety valve startup critical value of 0.4～0.6 MPa, the indentation position was at first washed open by interior pressure, discharges chemical reaction gas, alleviates interior pressure.Yet, indentation type safety valve often lost efficacy, reason is that the degree of depth of indentation is difficult to accurate control in manufacture process, and, in the battery use, because of factors such as external impacts shakes, temperature is expanded with heat and contract with cold are expanded the degree of depth of indentation, become darker, even penetrate shell, cause electrolyte leakage, battery failure.If indentation is shallow excessively, when inner pressure of battery arrived critical value, safety valve was still inoperative, and safety valve lost efficacy.The film-type safety valve is comparatively complicated, generally uses Copper Foil as film, bonds or is welded on the metal shell or the relief hole on the cover plate of battery.Similar to above indentation type safety valve failure reasons, when selecting thin Copper Foil for use, because of factors such as external impacts shake, temperature is expanded with heat and contract with cold, breakage often takes place in Copper Foil, with the relief hole conducting that it covered, and electrolyte leakage, battery failure.When selecting thicker Copper Foil for use, when inner pressure of battery arrived critical value, safety valve was still inoperative, and safety valve lost efficacy.
(5) external cause that causes liquid lithium ion battery explosion pyrophoricity accident has many kinds, for example battery short circuit, overcharge, thermal shock, external impacts etc.No matter the external cause that causes battery explosion burning is how, before the battery explosion burning, a common trait is arranged all, the rising be exactly the temperature of battery itself is bound to, the critical temperature value of blasting is 150 ℃.If the speed that battery temperature rises is slower, and stopping and stable a period of time below 150 ℃, when for example between 130～140 ℃, slowly rising, battery diaphragm (polypropylene and vinyl polymer film) can melt and the closed pore effect by generating material, blocking-up inside battery current channel, make battery failure, any electrochemical reaction is forced to end, and blast can not take place.But, very fast if battery temperature rises, break through 150 ℃, particularly arrive 200 ℃, cobalt acid lithium participates in cell reaction in the positive electrode, discharges a large amount of active oxygens, electrolyte gasifies in a large number, and the temperature and the air pressure of inside battery sharply rise, and battery is blast and burning therefore.This shows that the sharp increase of cell internal pressure only is the intermediary determinants of battery explosion and burning, rather than basic reason.The mechanism of battery explosion and burning is that battery temperature raises, and has surpassed critical value.The sharp increase of inner pressure of battery is not abiogenous, is because battery temperature rises, and just causes electrolyte be heated gasification and electrolyte and the improper chemical reaction acceleration of electrode.In other words, inner pressure of battery sharp increase is to rise to cause with battery temperature; The consequence that battery temperature rises and caused inner pressure of battery to increase severely is final result at last with the battery explosion.The process of battery explosion and burning is: battery temperature rising → air pressure inside increase → battery outer rigid housing and interior pressure are contended with → are arrived and surpass shell resistance to compression critical value → battery explosion.
According to above-mentioned analysis, liquid lithium ionic cell explosive combustion generation basic reason is that battery temperature rises, rather than interior pressure increases.It is the result that battery temperature rises that interior pressure increases severely, and battery explosion is the final outcome that battery temperature rises.The design principle of all battery safety valves before the present invention all is based upon the inner pressure of battery increase and causes on the basis of battery explosion.Makeing mistakes in the battery design basis, causes safety valve invalid, and Here it is, and why the liquid lithium ionic cell explosive combustion does not have controlled for a long time.
The present invention is based on the principal element that battery temperature rises to the battery explosion burning to the design principle of safety valve, and internal pressure increases the intermediary determinants for the battery explosion burning.The first road safety valve at first rises to battery temperature and makes a response, and the second road safety valve increases inner pressure of battery makes a response, and two kinds of safety valves can be distinguished or start simultaneously, and the interior pressure of battery is in time discharged, and presses the further consequence that increases severely and cause in avoiding.The design of safety valve of the present invention, preparation and use will be done concrete below and describe in detail.
Second aspect adopts metal forming preparation folding shell and uses temperature sensitive type macromolecule seal adhesive tape to constitute battery case, and metal forming/macromolecule folding shell promptly is a battery case, also is battery safety valve.
The square liquid lithium ionic cell that prior art is produced adopts aluminium alloy and stainless steel to make shell, because the restriction of production technology, outer casing thickness is about 0.2～0.3mm, the cover plate of battery case uses laser-beam welding machine to be welded on the shell, entire cell shell rigidity intensity is big, resists the ability height of external and internal pressure.So the battery case of design can be resisted the air pressure inside or the external impacts of 1～4 MPa.Yet from lithium battery is in the experience of market sale and client's use for many years, lithium battery is not to use separately; but as one of components and parts; be placed in numbers such as mobile phone and the electronic installation and use, the same with other electronic devices and components, be subjected to the protection of electronic device housing.In fact, number such as mobile phone and electronic installation can not bear the external impact pressure of 1～4 MPa, when the various components and parts in the electronic installation under external impacts, be damaged and when losing efficacy, only to survive be nonsensical to battery.For inside battery, the shell of lithium battery should not resisted air pressure inside, but should in time dredge and discharge interior pressure, with battery burning and the generation of avoiding increasing severely and causing because of interior pressure of blast consequence.In a word, no matter for outside or to inner, lithium battery promptly there is no need should very big rigidity and the rigid shell of working strength yet.
In sum, the design principle of li battery shell of the present invention and safety valve is, with battery temperature (rather than with inner pressure of battery) as design object, whole casing is designed to safety valve, be provided with in the many places of shell with safety valve temperature actuated and that start with air pressure, the startup of these safety valves can be to take place respectively or simultaneously, so that realize the design object of " in time " and " effectively ".The wherein rising of the timely induced cell temperature of " in time " representative, and press in the release of in time making a response; " effectively " is for the safety valve of prior art for preparing often lost efficacy, and safety valve of the present invention under any circumstance all can effectively start, effectively dredges and controls inside battery air pressure, avoids the inside battery situation to worsen.
Preparation technology's method that the present invention rolls over shell-type safety valve and battery case thereof is:
(1) use metal forming as battery case, the thickness of metal forming is 0.01～0.2mm, and the composition of metal forming is fine aluminium, aluminium alloy, pure nickel, nickel alloy or stainless steel;
(2) use stamping machine and die cutting die, with tinsel through die-cut and make shape shown in Figure of description 2 of the present invention, a=10～600mm wherein, b=8～550mm, c=15～700mm, d=1～20mm, e=7～549mm;
(3) be converted into 90～100 degree along rolling over the two side faces of shell broken line then, the two side faces of detaining can outward is converted into 80～90 degree interior button can;
(4) can is carried out surface degreasing purification and deoxidation processing, the surface-treated purpose is to make the two side faces of can and temperature sensitive type macromolecule seal adhesive tape have good bonding and sealing;
(5) temperature sensitive type macromolecule seal adhesive tape is passed through hot pressing mode, be bonded in the can two side faces.The thickness of macromolecule seal adhesive tape is 0.01～0.2mm, and width is less than or equal to the width of metal folding shell-side face.The process conditions of hot pressing are: 70～350 ℃ of temperature, 1～3000 second time, pressure 0.1～15 MPa.The molecular weight of macromolecule seal adhesive tape is 1000～8,000, between 000, melting temperature is 60～310 ℃, its chemical composition can be selected in following macromolecular compound: polypropylene, polyethylene, polyester, polystyrene, polyvinyl chloride, polymethylacrylic acid, polymethacrylates, polymethyl acrylate, polymine, polymonochlorotrifluoroethylene, polynonamethylene carbonate, polyolefin, polysiloxanes, polyoxamide, polyethylene glycol, polyoxybutylene, polyoxyamylene, polyimides, polyvinyl acetate, polyvinyl alcohol, poly-1-butylene, poly-1-amylene, polyisobutene, Kynoar, Vingon, polytetrafluoroethylene, polyformaldehyde, polyethylene glycol oxide, PolyTHF, polyethylene terephthalate, the poly bisphenol carbonic ester, 1,4-polybutadiene (cis), 1,4-polybutadiene (trans), polyoxamide and EVA resin.According to adhering and sealing requirement of strength and needs of adjusting fusing-off temperature or the like, the macromolecular compound of more than giving an example can use separately or a plurality of mixing is used, also can carry out re-using after all kinds of processing for example crosslinked, copolymerization, modification and additive etc. to them.
(6) with can along bottom fold, to amounting to the battery case that is fastened as the folded form shown in Figure of description 3 of the present invention;
(7) use hot press that metal is rolled over the mutual adhering and sealing of seal adhesive tape of shell dual side-edge face, make the folding hull shape after the doubling become a completed cell shell with mechanical strength.
(8) behind the can make-up,, use the laser machine with its welded seal in the slit that battery folding shell-type outer casing bottom forms.
The present invention rolls over shell safety valve one and has five, is in the different parts of battery folding shell-type shell; Wherein two the folding shell the dual side-edge faces, other two be the folding shell two planes, last battery cover board and the folding shell the commissure.Their work principle is:
(1) the temperature sensitive type macromolecule seal adhesive tape that is bonded on the folding shell dual side-edge face has triple role: 1. in the normal serviceability temperature scope of battery, for example below 60 ℃, macromolecule seal adhesive tape plays bonding and the fixedly effect of inside/outside make-up can, make can become a complete and battery case that have rigidity, safeguard and guarantee the operate as normal of inside battery system; 2. the dual side-edge edge of sealed cell prevents that inside battery electrolyte leakage and outside batteries air moisture from entering; 3. safety valve temperature switch, temperature sensitive type macromolecule seal adhesive tape is responsive to temperature, and bonding and sealing function is lost in i.e. fusing at a certain temperature.In other words, when battery temperature rises to the fusing point of macromolecule seal adhesive tape or softening point, folding shell dual side-edge edge will be opened under metal self tension force, can cool off and reduce battery temperature whereby, also can discharge and drain inner pressure of battery.Therefore, folding shell dual side-edge face and macromolecule seal adhesive tape (temperature switch) constitute two temperature sensitive safety valves jointly, and different with the safety valve of prior art is that they are not washed open startup by the interior pressure that battery increases suddenly, but before inner pressure of battery increases, rely on temperature effect to start.
(2) according to the needs of battery user and the specific requirement in battery applications field, select different material chemical composition prescriptions for use, can adjust the fusing point or the softening point of macromolecule seal adhesive tape, for example, from 60 ℃ to 310 ℃.The fusing point or the softening point of temperature sensitive type macromolecule seal adhesive tape are low more, and the TSV of folding shell dual side-edge face is responsive more to the reaction that battery temperature changes, and the speed of startup is fast more.
(3) two planes of folding shell are air pressure safety valves: because the present invention adopts the super thin metal paper tinsel as battery case, metal forming has ductility and tensility.Under the special case that inner pressure of battery increases suddenly, that is to say, if the speed that interior pressure increases surpasses the speed that battery temperature rises, the macromolecule seal adhesive tape of folding shell dual side-edge face does not also have enough time to melt, bulging will take place in two planes of folding shell, to increase the inside battery safe space, alleviate internal pressure.When bulging takes place in folding shell two planes, the internal cell core is also strutted by gas, along with folding shell two planes bulging together, in other words, after battery loses the constraint and support of folding shell two planar metal shells, the expanding gas of inside battery struts positive, negative electrode plate, spacing between the positive, negative electrode plate increases, electrolyte has lost with them and has contacted, the current channel of inside battery is cut off, no matter, all can't continue the generation effect to battery from inside battery or outside energy, the battery so the safety that becomes.
(4) under special case, inner pressure of battery increases suddenly, its speed surpasses the speed that battery temperature rises, two planes of folding shell air pressure safety valve at first starts, to extend, the mode of stretching and bulging increases the inside battery safe space, alleviate internal pressure, stop even without the chemical reaction that makes inside battery, also alleviate chemical reaction velocity and won the time, battery temperature continue to be raise, and when arriving the fusing point of macromolecule seal adhesive tape, folding shell dual side-edge face is opened rapidly under the pulling force acting in conjunction on the impulse force of inner pressure of battery and two planes of folding shell, discharge inner pressure of battery and cool batteries temperature, this moment, battery entered safe condition.
(5) under egregious cases, for example battery is by improper use or disposal in violation of rules and regulations, inner pressure of battery increases suddenly, its speed surpasses the speed that battery temperature rises, two planes of folding shell air pressure safety valve at first starts, mode with bulging increases the inside battery safe space, alleviate internal pressure, if the chemical reaction of inside battery is stopped, inner pressure of battery can be washed the weakest place of weld seam at battery cover board and folding shell edge open, discharge inner pressure of battery and cool batteries temperature, this moment, battery entered safe condition.Compare with the liquid lithium ionic cell that prior art is produced, lithium battery folding shell of the present invention uses the super thin metal paper tinsel, with the weld strength of battery cover board a little less than, the atmospheric pressure that can bear is less, therefore, when egregious cases took place, the fail safe of battery was better.
In sum, the present invention rolls over five safety valves on the shell-type shell, can in the mode that successively starts or start simultaneously respectively, carry out in time and effectively reply according to the various abnormalities of battery, guarantees the fail safe of battery.
The third aspect adopts metal forming not only can promote battery security as battery case, and can increase the loading of cell active materials, promotes battery capacity.
(aluminum hull or box hat) material thickness of existing metal-back liquid lithium battery is more than 0.25 millimeter, and two gross thickness is above 0.5 millimeter.If metal material thickness is reduced to 0.2 millimeter, metal material reduced thickness 20% can be filled the cell active materials of 0.1 millimeters thick more; If metal material thickness is reduced to 0.15 millimeter, shell wall thickness attenuate 40% can be filled the cell active materials of 0.2 millimeters thick more.Using same material and do not changing under the prerequisite of pole piece component prescription, because the total amount of the active material in the battery increases, discharge capacity of the cell will increase in proportion.The thickness of the aluminum-plastic composite membrane shell that the polyalcohol flexible packing lithium battery uses is about 0.11 millimeter, is equivalent to 44% of 0.25 millimeter of existing metal shell wall thickness.Here it is why, under the prerequisite of using same material and identical pole piece component prescription, and the reason of the capacity high 10～20% of the Capacity Ratio metal-back lithium battery of polyalcohol flexible packing lithium battery.Adopt the metal folding case lithium ion battery of the inventive method preparation, use 0.01～0.2 millimeter metal forming as shell, battery capacity not only can surpass existing common metal shell liquid lithium battery, and can increase by 3～10% than polyalcohol flexible packing lithium battery capacity.
The sheathing material of polyalcohol flexible packing lithium battery, aluminum-plastic composite membrane are to be bonded by CPP film/adhesive linkage/aluminium foil/adhesive linkage/multilayered film materials such as nylon membrane, and gross thickness is about 0.11 millimeter, and wherein aluminum foil thickness has only 0.04 millimeter.Aluminum-plastic composite membrane is very soft, does not have rigidity and hardness, and the bulging and the phenomenon of leakage appear in battery easily.In addition, the aluminum-plastic composite membrane surface is scratched easily, causes the battery bad order.In order to solve the problem that the aluminum-plastic composite membrane surface is damaged easily, be applied to the polyalcohol flexible packing lithium battery of high-end electronic product, coat thick stainless steel paillon foil of the about 0.1mm of one deck or aluminium alloy paillon foil again on the aluminum-plastic composite membrane surface, with the protection battery case.Therefore, not only increase material cost, and strengthened production cost.
The present invention uses the super thin metal paillon foil as battery case, compare with common metal shell (aluminum hull or box hat) lithium battery, promoted battery capacity, compared, the defective that reduces and avoided producing as shell because of the use aluminum-plastic composite membrane with the polyalcohol flexible packing lithium battery.
By the reference Figure of description, Zhi Bei safety valve against existing technologies can be understood the structure and the characteristics of folding shell safety valve provided by the invention and battery case thereof in further detail, wherein:
Fig. 1 is the generalized section of the liquid lithium battery of prior art production, wherein 10 represents the battery metal shell, and thickness is bigger, has higher mechanical strength and metal rigidity, can resist stronger air pressure inside and outside impulse force; 12 represent battery; 14 representative " T " font safety valves.Indentation type safety valve is when relying on inside battery air pressure and increasing to critical value, is washed open by interior pressure and starts.Yet the very difficult control of the degree of depth of indentation and precision often because have little time air pressure inside is made a response and lost efficacy, causes battery explosion.
Fig. 2 be tinsel of the present invention through after die-cut, the folding shell floor map of making, wherein 20 representative folding shell-side face broken lines; 22 representative folding shell lateral surfaces; 24 representative folding shell bottom fold; 26 representatives are used to form the die-cut fracture of folding shell bottom; 28 representative folding shell medial surfaces.
Fig. 3 is a folding case lithium ion battery generalized section of the present invention, wherein 30 representative folding shell lateral surfaces; 32 representatives are clipped in the temperature sensitive type macromolecule seal adhesive tape in two inside/outside sides of folding shell; 34 represent battery; 36 representative folding shell medial surfaces; On behalf of the can make-up, 38 form the sealing wire in slit, bottom afterwards; 40 representative folding shell-side faces; 42 representative folding shell planes.
By following preferred embodiment, describe the production process that the present invention rolls over shell high-energy safe lithium ion battery in detail, above-mentioned purpose of the present invention and advantage will be apparent.
Example one:
Produce the aluminium folding case lithium ion battery with following method, wherein battery is a takeup type.
The manufacture method of negative electrode band:
The poly-inclined to one side vinylidene fluoride of 3 grams is dissolved in the N-first gives a tongue-lashing and cough up the alkane diketone for-2-, it is black to add 2.5 gram acetone then, adds 115 gram graphite powders at last.Through high-speed stirred evenly, vacuum or leave standstill degasification after make the cathode size of pulpous state.Cathode size is coated on two surfaces of Copper Foil of 10 micron thickness. give a tongue-lashing and cough up the alkane diketone for-2-120 ℃ of down dry N-first of desolvating of removing, the THICKNESS CONTROL of electrode band is at 250 ± 10 microns, and the THICKNESS CONTROL of electrode band after roll-in is at 110 ± 5 microns.Negative electrode band cutting is become 44 x 340mm
2Size.Nickel down-lead of spot welding on the initial copper-clad surface of not filming then.
The manufacture method of positive electrode band:
The poly-inclined to one side vinylidene fluoride of 6 grams is dissolved in the N-first gives a tongue-lashing and cough up the alkane diketone for-2-, it is black to add 11 gram acetone then, adds the lithium, cobalt, nickel and manganese oxide Li (Co of 200 gram low cobalt contents at last
0.05Ni
0.60Mn
0.35) O
2Use low cobalt/cobalt oxide can reduce material cost and lifting battery capacity.Through high-speed stirred evenly, vacuum or leave standstill degasification after make the anode sizing agent of pulpous state.Anode sizing agent is coated on two surfaces of aluminium foil of 18 micron thickness.Give a tongue-lashing and cough up the alkane diketone for-2-120 ℃ of down dry N-first of desolvating of removing, the THICKNESS CONTROL of electrode band is at 280 ± 10 microns.The THICKNESS CONTROL of electrode band after roll-in is at 110 ± 5 microns.Positive electrode band cutting is become 42 x 310mm
2Size, aluminum lead of spot welding on the initial aluminium foil surface of not filming then.
The manufacture method of battery:
With positive, negative electrode plate and width is that the PE-PP membrane band of 46mm sequences in proper order by positive electrode/barrier film/negative electrode/barrier film, is placed on the up-coiler, is wound into 3.2 x, 29.3 x 46mm
3Battery.Total positive, negative electrode plate 10 circles of battery are wrapped insulating tape on the positive and negative electrode lead-in wire, and lead-in wire grows battery 15mm, parallel interval 10mm.
Preparation technology's method of the metal/high-molecular battery folding shell of equipment safety valve:
With thickness is the aluminium alloy paillon foil of 0.08mm, and through the die-cut shape of making as shown in Figure 2, wherein parameters is a=36.8mm, b=29.8mm, c=49mm, d=3.4mm, e=29.6mm.With die-cut good aluminium alloy paillon foil, through flanging, will roll over shell two lateral surfaces and be converted into 92 degree, will roll over shell two medial surfaces and be converted into 88 degree.Metal folding shell is done surface clean, and used thickness is that 0.05mm and width are the polypropylene seal adhesive tape of 3mm then, through hot pressing, is bonded in folding shell two lateral surface inner surfaces and folding shell two medial surface outer surfaces.In the d doubling of can middle part, to being fastened as battery folding shell.Use hot press will roll over the shell two side faces and seal, use the laser machine with doubling at last after the slit, bottom weld, form a complete folding type battery shell thus, overall dimension is 3.4 x, 30 x 49mm.
The battery assembling:
Battery is packed in the ready battery folding shell, the positive and negative electrode lead-in wire is welded with the cover plate relevant position.With the laser machine slit around cover plate and the battery folding shell is welded again, after the process vacuum test is qualified, vacuumize is 6 hours under 80 ℃ temperature, injects 1.5 milliliters of electrolyte by the cover plate liquid injection hole after the cooling, re-uses the steel ball sealing liquid injection port suitable with cover plate liquid injection hole diameter.
The chemical synthesizing method of battery:
Use special-purpose battery charging and discharging equipment that battery is carried out 4.2V/0.2C (CC+CV) and charge at a slow speed and change into, at negative electrode surface formation diaphragm.
Example two:
Produce the steel folding case lithium ion battery with following method.Wherein battery is stacked
The manufacture method of negative electrode band:
The poly-inclined to one side vinylidene fluoride of 3 grams is dissolved in the N-first gives a tongue-lashing and cough up the alkane diketone for-2-, it is black to add 3 gram acetone then, adds 115 gram graphite powders at last.Through high-speed stirred evenly, vacuum or leave standstill degasification after make the cathode size of pulpous state.Cathode size is coated on two surfaces of Copper Foil of 10 micron thickness.Give a tongue-lashing and cough up the alkane diketone for-2-120 ℃ of down dry N-first of desolvating of removing, the THICKNESS CONTROL of electrode band is at 260 ± 10 microns.The THICKNESS CONTROL of electrode band after roll-in is at 110 ± 5 microns.Negative electrode band cutting is become kitchen knife shape: the operator area is 32 x 46mm
2Size, hilt area are 5 x 7mm
2Size, hilt partly are the Copper Foils of not filming, and its surface will be at the subsequent handling mid point nickel down-lead of burn-oning.
The manufacture method of positive electrode band:
The poly-inclined to one side vinylidene fluoride of 6 grams is dissolved in the N-first gives a tongue-lashing and cough up the alkane diketone for-2-, it is black to add 12 gram acetone then, adds the Li, Ni, Mn oxide Li (Ni of 200 grams, zero cobalt content at last
0.6Mn
0.4) O
2Use zero cobalt/cobalt oxide can reduce material cost and lifting battery capacity.Through high-speed stirred evenly, vacuum or leave standstill degasification after make the anode sizing agent of pulpous state.80% anode sizing agent is coated on two surfaces of aluminium foil of 18 micron thickness, the slurry of residue 20% is coated on the aluminium foil list surface of 25 micron thickness.Give a tongue-lashing and cough up the alkane diketone for-2-120 ℃ of down dry N-first of desolvating of removing, the THICKNESS CONTROL of the two-sided electrode band of filming is at 300 ± 10 microns, the THICKNESS CONTROL of electrode band after roll-in is at 110 ± 5 microns, single face is filmed the THICKNESS CONTROL of electrode band at 180 ± 7 microns, and the THICKNESS CONTROL of electrode band after roll-in is at 80 ± 3 microns.Positive electrode band cutting is become kitchen knife shape: the operator area is 30 x 44mm
2Size, hilt area are 5 x 7mm
2Size, hilt partly are the aluminium foils of not filming, and its surface will be at the subsequent handling mid point aluminum lead of burn-oning.
The manufacture method of battery:
With positive, negative electrode plate and width be 46mm the PE-PP membrane band by electrode film/barrier film/negative electrode plate/barrier film/... the order of/electrode film sequences, have 11 negative electrode plates, 10 double-side membrane electrode films and 2 single face film electrode films, constitute 3.0 x, 33 x 46mm
3The hilt Copper Foil of battery .11 negative electrode plate pool together and be welded on the nickel down-lead.10 double-side membrane electrode films and 2 single face film electrode film hilt aluminium foils pool together and are welded on the aluminum lead.Wrap insulating tape on the positive and negative electrode lead-in wire, lead-in wire grows battery 15mm, parallel interval 10mm.
Preparation technology's method of the metal/high-molecular battery folding shell of equipment safety valve:
With thickness is the stainless steel paillon foil of 0.05mm, and through the die-cut shape of making as shown in Figure 2, wherein parameters is a=40.2mm, b=33.8mm, c=49mm, d=3.0mm, e=33.6mm.With die-cut good stainless steel paillon foil, through flanging, will roll over shell two lateral surfaces and be converted into 92 degree, will roll over shell two medial surfaces and be converted into 88 degree.Metal folding shell is done surface clean, and used thickness is that 0.05mm and width are the polypropylene seal adhesive tape of 2.5mm then, through hot pressing, is bonded in folding shell two lateral surface inner surfaces and folding shell two medial surface outer surfaces.In the d doubling of can middle part, make-up is made the folding type battery shell.Use hot press will roll over the shell two side faces and seal, use the laser machine with doubling at last after the slit, bottom weld, form a complete folding type battery shell thus, overall dimension is 3.0 x, 34 x 49mm.
The battery assembling:
Battery is packed in the ready folding type battery shell, the positive and negative electrode lead-in wire is welded with the cover plate relevant position.With the laser machine slit around cover plate and the battery folding shell is welded again, after the process vacuum test is qualified, vacuumize is 6 hours under 80 ℃ temperature, injects 1.5 milliliters of electrolyte by the cover plate liquid injection hole after the cooling, re-uses the steel ball sealing liquid injection port suitable with cover plate liquid injection hole diameter.
The chemical synthesizing method of battery:
Use special-purpose battery charging and discharging equipment that battery is carried out 4.2V/0.2C (CC+CV) and charge at a slow speed and change into, at negative electrode surface formation diaphragm.
The negative material of giving an example in the above example can also use agraphitic carbon, amorphous carbon, carbon fiber, kamash alloy and silicon-base alloy etc. except graphite.Positive electrode can also use Li, Ni, Mn oxide, lithium nickel oxide, lithium iron phosphate and lithium manganese oxide etc. except using cobalt acid lithium, lithium, cobalt, nickel and manganese oxide.
Compare with metal-back liquid lithium ionic cell and polyalcohol flexible packing lithium battery that prior art is produced, adopt process provided by the invention, produce folding case lithium ion battery, the advantage of its every technology and security performance is summarized as follows:
(1) has than the better safety and reliability of polyalcohol flexible packing lithium battery: the polyalcohol flexible packing lithium battery First since Japan batch production, its output accounted for global lithium ion battery total output at present from 1999 20%. The history identity in 8 years, the polyalcohol flexible packing lithium battery does not have in global lithium battery market Explosion Accident takes place, and is one of safest battery in the chargeable battery kind. Polyalcohol flexible packing Lithium battery uses aluminum-plastic composite membrane as shell, has with the compound folding shell of metal/high-molecular provided by the invention Similar feature. For example aluminum-plastic composite membrane is by one deck aluminium foil and the laminated plastics film is compound consists of, although The gross thickness of aluminum-plastic composite membrane is 0.11mm, but wherein the thickness of aluminium foil only is 0.04mm. Because gold Belong to the thinner thickness of aluminium foil, aluminum-plastic composite membrane is done at inner pressure of battery without any mechanical rigid and intensity With lower, produce easily bulging and discharge interior pressure, the improper chemical reaction of inside battery is stopped, battery Enter safe condition. Also be based on same reason, because without any mechanical rigid and intensity, In production, assembling and the use procedure, the aluminum-plastic composite membrane shell of polyalcohol flexible packing lithium battery is easy to Be subjected to the destruction of foreign body and strength, make the inside battery system defective (for example, self-discharge rate occur Increase and inner micro-short circuit etc.), even can't work. Therefore, the polymer of prior art production The safety and reliability of flexible package lithium cell is not best. In order to improve polyalcohol flexible packing lithium electricity The safety and reliability in pond, up-to-date technology trends be, increases the thickness of aluminum-plastic composite membrane, For example, replace the thickness of 0.11mm with 0.18mm thickness, wherein the thickness of aluminium foil is added to 0.06mm. Folding case lithium ion battery of the present invention uses ultrathin metal forming, has namely reduced outer casing thickness, Having simultaneously better mechanical rigid and intensity, is the optimal selection of battery security and reliability.
(2) superelevation battery capacity and energy density: under the prerequisite that does not change positive and negative electrode material and component prescription, The key that promotes battery capacity in limited bulk is control cell thickness and the active matter of filling more. Existing The square liquid metal shell lithium battery that has technology to produce, the thickness of its battery case is bigger, in same electrical Under the thickness of pond, the active material that can fill is less, and therefore, battery capacity is littler. For example, square The thickness of liquid box hat li battery shell is 0.3mm, and the thickness of square liquid aluminum hull li battery shell is 0.25mm the thickness of polyalcohol flexible packing lithium battery aluminum-plastic composite membrane external packing is 0.11mm, with thick Degree is that example compares for the quadrate lithium battery of 4.0mm, square liquid aluminum hull li battery shell material More multiplex 7% than polyalcohol flexible packing lithium battery, square liquid box hat li battery shell material compares polymer Flexible package lithium cell multiplex 9.5%. Therefore, only consider factor of sheathing material thickness, polymer The square liquid aluminum hull lithium battery capacity of the Capacity Ratio of flexible package lithium cell is high by 7%, than square liquid steel shell Lithium battery is high by 9.5%. As a same reason, when folding case lithium ion battery uses the ultrathin metal forming of 0.05mm, Its battery capacity will be higher by 3% than polyalcohol flexible packing lithium battery, than square liquid aluminium shell lithium battery capacity High by 10%, higher by 12.5% than square liquid steel shell lithium battery. Except ultra-thin shell is the folding case lithium ion electricity The pond has outside the reason of higher battery capacity, because its security is better, can use ultra-thin barrier film Other liquid lithium batteries such as band further promote its battery capacity because of the out of use material of security reason Advantage. Consider every factor, adopt the folding case lithium ion battery of the inventive method preparation, electricity Tankage not only can surpass existing common metal shell liquid lithium battery 10～30%, and can be than poly-Compound flexible package lithium cell capacity increases by 3～10%; Come calculating energy density with this, the folding case lithium ion electricity The volume and weight energy density in pond all will be than other battery height.
(3) ultra-thin lithium cell thickness: the thickness of square metal shell liquid lithium battery is because of the restriction of prior art, only Can produce the thickness specification is the above battery product of 3.0mm. For less than the slim of this thickness requirement or Ultrathin lithium battery, existing production Technology can't realize. Process provided by the invention can To prepare the folding case lithium ion battery of 1～3mm thickness, the blank of lithium battery product scope will be filled up.
(4) eliminate polyalcohol flexible packing lithium battery bulging and leakage: the easiest generation of polyalcohol flexible packing lithium battery and The most headachy defective is bulging and leakage. Bulging and leakage defective odds may be up to hundred Divide rate, and market and client's acceptable ratio of defects only are 1,000,000/, the two differs 10,000 times. The aluminum-plastic composite membrane flexible housings material that the polyalcohol flexible packing lithium battery uses, be cause the battery bulging and The principal element of leakage. In the polyalcohol flexible packing Production Process of Lithium Battery, aluminum-plastic composite membrane will pass through Rush box and be shaped the multiple working procedures such as closedtop and side seal. The operation of every procedure all may produce defective, example As, rushing in the box forming process, the internal layer CPP diaphragm of aluminum-plastic composite membrane may be damaged, and battery is annotated Liquid and change into after may produce the box cancer, the box cancer will cause the battery bulging. Temperature in closedtop and the side seal operation The Job Operations such as degree, pressure and time are slightly neglected, and cause cell sealing not tight, and drum will appear in battery Expand and leakage. Use the super thin metal foil material as battery case and laser seal welding technology, do not have These produce the production process of defective easily to rush box shaping, closedtop and side seal, can effectively avoid electricity The generation of pond bulging and leakage. The folding case lithium ion battery that adopts process provided by the invention to produce, Its bulging and leakage rate can be less than 0.1ppm (1/10000000th).
(5) improve battery outward appearance, reduction battery fraction defective and enhancing battery reliability: the polyalcohol flexible packing lithium battery Other two common deficiencies are, outward appearance is relatively poor, and shell is easily damaged, cause thus battery transportation and In the use procedure, produce the problem of fraction defective increase and reliability variation. The aluminum plastic composite membrane is soft With the material of fragility, in production operation, Product transport and client's use procedure, aluminum plastic is compound Film may be scratched, punctures, squeeze wound and cut damage. Any external hard thing and strength all might be to poly-The shell of compound flexible package lithium cell produces and destroys, and causes battery failure. For these problems, Japan The polyalcohol flexible packing lithium battery that Sony, Sanyo produce coats one again on the aluminum-plastic composite membrane surface The thick stainless steel foil of the about 0.1mm of layer is with the protection battery case. Not only increased material cost, and Also strengthened production cost. The present invention uses ultrathin metal material as outside the folding case lithium ion battery Shell can significantly improve the battery outward appearance, reduces the battery fraction defective and promote the reliability of battery.
(6) cut the garment according to the figure battery processed, tackle big market flexibly: square stainless steel case is the stainless of Application standard specification Steel pipe, stretched forming. If the size that battery user requires is not in the standard specification of stainless steel tube In the scope, battery stainless steel case manufacturer will be unable to supply the shell of this specification. Square aluminum hull must through Cross the multiple tracks complicated procedures of forming, finish production process. The aluminum hull of a new spec model of every exploitation needs to drop into Tens thousand of units are to hundreds thousand of units, and the time in several weeks even tens of weeks, and expense height, cycle are long. Adopt The invention provides technology, the preparation folding case lithium ion battery as cutting the garment according to the figure, uses volume The dress metal foil, the battery size that requires according to customer order, through cutting and the simple procedures such as die-cut, Make needed battery case, can in time finish rapidly the production order, compete in the market that strengthens enterprise Strive power.
(7) reduce material cost, production cost and energy resource consumption: the shell materials of folding case lithium ion battery of the present invention Amount is lacked than square metal-back liquid lithium battery, has reduced material cost. The shell of folding case lithium ion battery Production process does not need expensive mould and large-scale punch press, and production process is simple, and the cycle is short, has saved Production cost. Because the metal shell filming, the electric power consumption that uses in laser beam welding is big For reducing, accomplished energy-saving and cost-reducing.
Claims (6)
1. folding case lithium ion battery, mainly folded form shell composite component, positive electrode composite component, negative electrode composite component and the electrolyte between the positive and negative electrode composite component/four kinds of cell devices of barrier film composite component that are made of metal forming/temperature sensitivity macromolecule constitute.The principal character of button box lithium ion battery is:
(1) adopts metal forming to be prepared into folding fastener box-like formula, constitute battery case metal part;
(2) use temperature sensitive type macromolecule seal adhesive tape that metal is rolled over bonding, the fixing and sealing of shell;
(3) the compound folding shell of metal/high-molecular of metal forming/temperature sensitive type macromolecule seal adhesive tape formation is the shell of battery, also is battery safety valve.
2. folding case lithium ion battery according to claim 1 is characterized in that using metal forming as battery case, and the thickness of metal forming is 0.01～0.2mm, and the composition of metal forming is fine aluminium, aluminium alloy, pure nickel, nickel alloy or stainless steel.
3. folding case lithium ion battery according to claim 1, the molecular weight that it is characterized in that described temperature sensitive type macromolecule seal adhesive tape is 1000～8,000, between 000, melting temperature is 60～310 ℃, its chemical composition can be selected in following macromolecular compound of giving an example: polypropylene, polyethylene, polyester, polystyrene, polyvinyl chloride, polymethylacrylic acid, polymethacrylates, polymethyl acrylate, polymine, polymonochlorotrifluoroethylene, polynonamethylene carbonate, polyolefin, polysiloxanes, polyoxamide, polyethylene glycol, polyoxybutylene, polyoxyamylene, polyimides, polyvinyl acetate, polyvinyl alcohol, poly-1-butylene, poly-1-amylene, polyisobutene, Kynoar, Vingon, polytetrafluoroethylene, polyformaldehyde, polyethylene glycol oxide, PolyTHF, polyethylene terephthalate, the poly bisphenol carbonic ester, 1,4-polybutadiene (cis), 1,4-polybutadiene (trans), polyoxamide and EVA resin.According to adhering and sealing requirement of strength and needs of adjusting fusing-off temperature or the like, the macromolecular compound of more than giving an example can use separately or a plurality of mixing is used, also can carry out re-using after all kinds of processing for example crosslinked, copolymerization, modification and additive etc. to them.
4. folding case lithium ion battery according to claim 1 is characterized in that on the composite battery folding shell of described metal/high-molecular formation five safety valves being arranged.Wherein two temperature sensitive safety valves are in two sides of rolling over shell, and two air pressure safety valves are in two planes of folding shell, and an air pressure safety valve is in battery cover board and the commissure of rolling over shell.
5. folding case lithium ion battery according to claim 1, the composite battery folding shell that metal/high-molecular constitutes, its preparation method has following steps:
(1) use stamping machine and die cutting die, with tinsel through die-cut and make shape shown in Figure of description 2 of the present invention, a=10～600mm wherein, b=8～550mm, c=15～700mm, d=1～20mm, e=7～549mm;
(2) be converted into 90～100 degree along rolling over the two side faces of shell broken line then, the two side faces of detaining can outward is converted into 80～90 degree interior button can;
(3) can is carried out surface degreasing purification and deoxidation processing;
(4) temperature sensitive type macromolecule seal adhesive tape is passed through hot pressing mode, be bonded in the can two side faces.The thickness of temperature sensitive type macromolecule seal adhesive tape is 0.01～0.2mm, and width is less than or equal to the width of can side.The process conditions of hot pressing are: 70～350 ℃ of temperature, 1～3000 second time, pressure 0.1～15 MPa.
(5) with can along bottom fold, make the folded form battery case to amounting to button;
(6) use hot press that metal is rolled over the mutual adhering and sealing of seal adhesive tape in the shell two side faces interlayer, make the doubling button box form a completed cell shell with mechanical strength.
(7) behind the can make-up,, use the laser machine with its welded seal in the slit that the collapsible outer casing bottom of battery forms.
6. the manufacture method of a folding case lithium ion battery comprises the preparation process of positive and negative electrode it is characterized in that also having thereafter following step:
(1) preparation barrier film: diaphragm paper is cut into the size that battery product designs, make mode separation strapping/sheet;
(2) preparation battery: above-mentioned ribbon element is put well by negative pole/barrier film/positive pole/barrier film or by positive pole/barrier film/negative pole/barrier film/anodal top-down order, made Battery Pole Core through coiling/lamination;
(3) battery case: prepare metal/high-molecular foldable battery case according to the described step of claim 5.
(4) assembling: on the positive and negative electrode lead-in wire, wrap insulating tape, put insulating spacer, then battery is inserted in the compound folding shell of metal/high-molecular.Positive and negative lead wires is welded on respectively on the surface and lug of cover plate, with the laser machine bridge welding is connected on the metal folding shell then.By liquid injection hole, use the sealing of the compound folding shell of vacuum method check metal/high-molecular.
(5) fluid injection and sealing: after 80 ℃ of following vacuumize a few hours, finish the injecting electrolytic solution operation, use steel ball then with cover plate liquid injection hole good seal.
(6) change into and place: with special-purpose battery charging and discharging equipment the finished product battery being charged at a slow speed changes into; form diaphragm at negative electrode surface. after placing several weeks then; remake discharge test, each battery is all detected, filter out qualified finished product battery.
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| CN110828714A (en) * | 2019-11-20 | 2020-02-21 | 四川新敏雅电池科技有限公司 | Shell for lithium ion cell and preparation method thereof, and lithium ion battery |
| CN112838196A (en) * | 2019-11-25 | 2021-05-25 | 宁德时代新能源科技股份有限公司 | Secondary battery and device containing the same |
| CN112838196B (en) * | 2019-11-25 | 2022-02-22 | 宁德时代新能源科技股份有限公司 | Secondary battery and device containing the same |
| US11404688B2 (en) | 2019-11-25 | 2022-08-02 | Contemporary Amperex Technology Co., Limited | Secondary battery and apparatus containing the same |
| CN111244526A (en) * | 2020-02-28 | 2020-06-05 | Oppo广东移动通信有限公司 | Flexible battery and electronic equipment |
| WO2022105010A1 (en) * | 2020-11-20 | 2022-05-27 | 宁德时代新能源科技股份有限公司 | Battery cell, battery, and power-consuming device |
| CN115039279A (en) * | 2020-11-20 | 2022-09-09 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and power consumption device |
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