CN2537128Y

CN2537128Y - Repeated charging and discharging lithium ion power cells

Info

Publication number: CN2537128Y
Application number: CN02209038U
Authority: CN
Inventors: 居永明
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-03-26
Filing date: 2002-03-26
Publication date: 2003-02-19
Anticipated expiration: 2012-03-26

Abstract

The utility model relates to a Li-ion power battery capable of repetitively charging and discharging; each single cell comprises a cover plate, a negative post, a safety valve, a positive post, electrolyte and a casing; wherein, the positive post is connected with the positive source, while the negative post is connected with the negative source; the positive electrode is made from a sheet of aluminum foil of certain thickness, and positive electrode active substances are evenly applied on both sides of the aluminum foil; whereas the negative electrode is made from a sheet of copper foil of certain thickness, both sides of which are evenly coated with negative electrode active substances. The utility model is characterized in that: the inner body is a multi-lamination structure formed by a rather long and narrow foldable negative electrode sheet, a plurality of positive electrode sheets and membranes together; a plurality of electrode complexes are neatly arranged at intervals in the order of positive electrode-negative electrode; the pole sheets of the positive electrode or the negative electrode all take the shape of rectangular pieces with large-leaf monopole lug or large-leaf multipole lug, and export current to the terminal posts through a current collection cleat; a terminal post or a plurality of terminal posts is/are arranged in the positive electrode, and a terminal post or a plurality of terminal posts is/are arranged on the negative electrode.

Description

Rechargeable lithium-ion-power cell

Technical field

The utility model relates to a kind of environment-friendly battery that can repeated charge, and more specifically, the utility model relates to a kind of lithium-ion-power cell that can repeated charge.

Background technology

Because environmental protection and requirements of saving energy, the world today is more and more urgent to the demand of the energy, therefore seeks high efficiency and clean power source, is the inexorable trend of social development and scientific and technological progress.

There have been a lot of researchs to set foot in the electrokinetic cell field.Current common electrokinetic cell has lead-acid battery, nickel-cadmium cell, Ni-MH battery, sodium-sulphur battery etc.But because its energy density is low, the charging interval is long, and can not satisfy the high-power demand that discharges and recharges.Directly influence the practicality of these electrokinetic cells.In the last few years, zinc-air cell, lithium ion battery, Proton Exchange Membrane Fuel Cells etc. all were considered to the best power source battery as the electrokinetic cell development.But owing to can't satisfy the high-power requirement that discharges and recharges, so its practicality problem has seriously hindered the practical application of electrokinetic cell.

Chinese patent application 001013564 discloses " a kind of rechargeable Cr-F-Li solid electrokinetic cell ".Nominally though be rechargeable Cr-F-Li solid electrokinetic cell, in fact its structure and component are all fully not open, therefore do not have practicality and using value substantially, and fundamentally do not solve the high-power problem that discharges and recharges.The greatest problem of lithium-ion-power cell is the heat that produces in the charge and discharge process, and this heat that in charge and discharge process, produces to lithium-ion-power cell be have very big dysgenic.

Therefore, the purpose of this utility model provides a kind of lithium-ion-power cell that can repeated charge, and it can solve the high-power problem that discharges and recharges of lithium-ion-power cell.

Summary of the invention

The utility model belongs to a kind of environment-friendly battery that can repeated charge, purpose is to wish with design is arranged unique current collection (afflux) terminal to be that the positive/negative plate of Da Ye lug is wound on simultaneously with barrier film and the interior body that constitutes, internally presses the high-power repeated charge requirement of the better current collection clamping plate solution of responsive thereby more reliable, safer more safety valve, afflux performance, heat dispersion lithium-ion-power cell, thus the extensive use of realization lithium-ion-power cell.

The utility model provides a kind of rechargeable lithium-ion-power cell, each cell is made up of cover plate, negative pole pole, safety valve, Positive Poles, current collection clamping plate, interior body, electrolyte, cylindrical or square (comprising rectangle) shell, it is characterized in that: interior body series is that positive plate, negative plate and barrier film constitute the electrode aggregate with disk-like structure jointly by the positive/negative plate group; Positive Poles is connected with positive pole, and the negative pole pole then is connected with negative pole; Positive pole is selected certain thickness aluminium foil for use, and the two sides evenly is coated with positive active material, and negative pole is selected certain thickness Copper Foil for use, and the two sides evenly is coated with negative electrode active material; The pole piece form of negative or positive electrode is the long and narrow rectangular sheet (being called the generate sheet again) of shape that has the multipole ear of Da Ye that Da Ye monopole ear or spacing do not wait, and Da Ye monopole ear, the multipole ear of Da Ye are referred to as the Da Ye lug again.The Da Ye lug can be the Tibetan hair style also for raising hair style both, and passed through current collection clamping plate derived current to pole; Positive pole has one or several poles, and negative pole has one or several poles, and the quantity of positive and negative terminals can equate also can not wait, and the diameter of pole can equate also can not wait.

The utility model has adopted the structure of the Da Ye lug that can lower current density, and its () can avoid resulting from the very harmful heat of lithium-ion-power cell to greatest extent.

The utility model also provides a kind of safety valve that is used for rechargeable lithium-ion-power cell, stage clip wherein is loaded in the endoporus of regulating bolt, the endoporus of regulating bolt is used to keep the stable of stage clip, sealed steel ball, stage clip can vertically slippage up and down in regulating the endoporus of bolt, sealed steel ball can vertically slippage up and down in regulating the endoporus of bolt, regulates on the external diameter of bolt and is processed with the screw thread that matches with the safety valve body; Regulate bolt and be processed with some vertical air discharge ducts, then have steam vent in the bottom of air discharge duct; Stage clip is pressed in the top of steel ball, and the bottom hole of sealed steel ball then falls on the fluorine rubber ring that is pressed on the cover plate liquid injection port; The pressure relief vent of safety valve bottom communicates with the liquid injection hole on the cover plate.

Unique current collection (afflux) terminal that the utlity model has design is that the positive/negative plate of Da Ye lug is wound on simultaneously with barrier film and the interior body that constitutes, internally presses the high-power repeated charge requirement of the better current collection clamping plate solution of responsive thereby more reliable, safer more safety valve, afflux performance, heat dispersion lithium-ion-power cell, thus the extensive use of realization lithium-ion-power cell.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is specifically described.In the accompanying drawings, identical Reference numeral is represented identical parts, wherein:

Fig. 1-1 is the cutaway view of folding lithium ion electrokinetic cell;

Fig. 1-2 represents the vertical view of folding lithium ion electrokinetic cell;

Fig. 1-AA is the schematic diagram of folding in the above described manner interior body;

The father of Fig. 1-AB positive plate, negative plate and barrier film is put the enlarged drawing of mode;

Figure 1A, 1A-1,1B, 1B-1,1C, 1C-1 are the various schematic diagrames of Da Ye lug on pole piece;

Fig. 2 is the enlarged drawing of dotted portion among Fig. 1-AA;

Shown in Figure 3 then is lithium-ion-power cell cutaway view of the present utility model;

Fig. 4 is the mode that stacks of the pole piece in the lithium-ion-power cell of the present utility model;

Fig. 5 and Fig. 6 represent the structure of compressed spring type and compressing tablet formula safety valve respectively.

Embodiment

Say from outward appearance, the basic comprising of lithium-ion-power cell as Figure 1-1, each cell system is made up of cover plate 1, negative pole pole 2, safety valve 3, Positive Poles 4 and uncovered shell 9; And in the inner chamber of lithium-ion-power cell, current collection clamping plate (also claiming the pole piece clamping plate) 6, electrolyte 8, negative plate 12, positive plate 13 and barrier film 19 (or 19-1) are arranged then.Negative terminal 2 on shell 9, the cover plate 1, safety valve 3, positive terminal 4 constitute the outer body of lithium-ion-power cell; Many to the positive/negative plate group, barrier film, current collection clamping plate constitute the interior body 7 of lithium-ion-power cell.Now that structure, manufacture craft (method) division of folding lithium ion electrokinetic cell is as follows:

The structure of folding lithium ion electrokinetic cell

As shown in the figure, in lithium-ion-power cell collapsible body 7 be by a comparatively long and narrow and folding negative plate and some positive plates and barrier film or both positive and negative polarity be long and narrow and folding generate sheet and barrier film constitute jointly have multiple lamination structure, electrode aggregate that the storing of positive and negative plate sequence interval is neat.Negative pole 12 be one can relatively back and forth fold, generate sheet that shape is long and narrow, anodal 13 are monolithic sheet (claiming the piece sheet again), by negative pole 12 stacked clamping.Anodal 13 also can be the generate sheet that can relatively back and forth fold, shape is long and narrow, and then negative pole 12 is the piece sheet.

Anodal 13 is to be made up of aluminium foil, positive active material, and aluminium foil is the metal forming of thin slice, and the two sides evenly has been coated with positive active material (can be cobalt acid lithium, also can be LiMn2O4, lithium nickelate or lithium nickel cobalt dioxide).The surface of aluminium foil is smoother usually, but the comparatively coarse aluminium foil in surface is for the coating active material, and adhesive force is better.Comparatively Shi Yi aluminum foil thickness scope is 10 μ m～80 μ m, when the area of anode pole piece be less than or equal to 1000mm * 500mm and more than or equal to 100mm * 50mm, discharge and recharge when requiring 1C～2C, get rid of other influencing factors, the optimum thickness of selecting aluminium foil for use is 15 μ m～25 μ m; Discharge and recharge and require 2C～3C or when bigger, get rid of other influencing factors, the optimum thickness of selecting aluminium foil for use be 20 μ m～45 μ m or more than.

Negative pole 12 is to be made up of Copper Foil, negative electrode active material, Copper Foil is the metal forming of thin slice, and the two sides evenly has been coated with the collector body of negative electrode active material (both can be native graphite, also can be crystalline flake graphite, Delanium or petroleum coke).The surface of Copper Foil is smoother usually, but the comparatively coarse Copper Foil in surface is for the coating active material, and adhesive force is better.Comparatively Shi Yi copper thickness is 6 μ m～50 μ m, when the area of cathode pole piece be less than or equal to 1000mm * 500mm and more than or equal to 100mm * 50mm, discharge and recharge when requiring 1C～2C, get rid of other influencing factors, the optimum thickness of selecting Copper Foil for use is 8 μ m～20 μ m; Discharge and recharge and require 2C～3C or when bigger, get rid of other influencing factors, the optimum thickness of selecting Copper Foil for use be 15 μ m～35 μ m or more than.

No matter anodal aluminium foil or negative copper foil, thickness all should not be too thick.The thickness of metal forming (aluminium foil/Copper Foil) the both area with collector is relevant, more relevant with the capacitance of each monolithic pole piece, should be thick slightly than the thickness of the metal forming of the smaller capacitance of metal foil thickness of high capacitance.Metal forming should be thin as far as possible under the situation of condition permission, in the hope of the bigger pole piece area of acquisition when being coated with the active material of measuring together, thereby obtains better electrical property.

In order to reduce the weight and volume of metal forming, also in order to increase the pliability of metal forming, so that lithium-ion-power cell is manufactured the shape that can adapt to various different shape needs, no matter positive pole or the used metal forming of negative pole also can be selected mesh-like or dull and stereotyped netted metal forming separately for use.So-called dull and stereotyped netted metal forming is promptly got some fine and closely woven apertures with mechanical means or chemical method or additive method on thin aluminium foil or Copper Foil, stretching on direction in length and breadth forms.

The active material (not comprising conductive agent, binding agent, dispersant) of lithium ion battery previously accounts for 90% in the batching total amount, all the other about 10% are conductive agent, binding agent, dispersant.The amount of the active material of the lithium-ion-power cell that the utility model relates to is positive pole or negative pole all has bigger increase no matter, is about 93%～95% even higher.The density of positive active material is 0.02g～0.06g for every square centimeter, when the area of anode pole piece is less than or equal to 1000mm * 500mm and during more than or equal to 100mm * 50m, the optimum density of positive active material is 0.032g～0.042g for every square centimeter; The density of negative electrode active material is about 0.01g～0.03g for every square centimeter, when the area of cathode pole piece is less than or equal to 1000mm * 500mm and during more than or equal to 100mm * 50mm, the optimum density of negative electrode active material is 0.014g～0.021g for every square centimeter.

The key property of lithium-ion-power cell should be fit to the power purposes, just must adapt to the high-power requirement that discharges and recharges.It is the Da Ye lug that the utility model adopts bigger current collection (afflux) terminal of area, and the Da Ye lug is more conducive to water conservancy diversion, heat radiation, can adapt to the high-power requirement that discharges and recharges fully.For the consistency of title and embody the feature image of current collection in the utility model (afflux) terminal as far as possible, so current collection (afflux) terminal is called the Da Ye lug, shown in Figure 1A-1, Figure 1B-1, as seen on the positive pole 13 a Da Ye lug 11 is arranged, be called shown in Da Ye monopole ear, Figure 1A, Figure 1B, a plurality of Da Ye lugs 10 are then arranged on the negative pole 12, be called the multipole ear of Da Ye.

The Da Ye lug should adopt bigger sectional area as far as possible under the situation of condition permission, that is to say that lug should be wide as far as possible, and is thick as far as possible, and current collection (afflux) path should be shortened as far as possible, helps the derivation and the heat radiation of electric current.Than the lithium-ion-power cell of low capacity, has only a Da Ye lug on the positive pole usually; Several Da Ye lugs are then arranged on the positive pole of the lithium-ion-power cell of larger capacity.Several Da Ye lugs can be arranged on the negative pole, also can have only a Da Ye lug.Compared to the Da Ye monopole ear, the multipole ear of Da Ye is than water conservancy diversion, the heat radiation better of Da Ye monopole ear.

Shown in Figure 1A, Figure 1B, some fold line 20/20-1 that are folded to are on the contrary arranged on the negative plate 12, fold line has certain width, during assembling must with negative pole 12 along the center line of fold line fold up relatively clamp anodal 13 become in body 7.Negative pole 12 can continuous phase be called generate sheet or pleated sheet to folding characteristic because of it in the utility model, anodal 13 are called the piece sheet.Figure 1A, Figure 1B, Fig. 1 C are the generate sheet (also can be described as and launch sheet) of negative pole 12, and as seen some fold line 20/20-1 are respectively arranged.Fold line 20 is inwardly folding, and fold line 20-1 is then folded-out.In order to prevent shedding or fracture that inside fold line 20 must scrape off the active material of coating accordingly on the collector, outside fold line 20-1 then need not scrape off active material (back side of fold line 20-1 is the fold line 20 that scrapes off active material).The fold line 20 of negative pole 12 and the area between the fold line 20-1 are a bit larger tham anodal 13 area, and consist of the positive/negative plate group with corresponding positive pole.Da Ye lug on the negative pole 12 is adjacent lug, and the adjacent lug in folding back can overlap; Adjacent Da Ye lug can also link and is one (disjunctor lug).Generally, when positive plate 13 is the monolithic sheet, then there is not fold line on it.But having under the situation about needing, anodal 13 also can be processed as disjunctor piece sheet.If just very disjunctor piece sheet also must be processed with inside fold line 20 therebetween, scrape off corresponding active material and get final product.The Da Ye lug of the positive pole 13 of disjunctor piece sheet is adjacent lug, can also be the disjunctor lug.

If the Da Ye lug on the positive/negative plate is for example upwards drawn from same direction or same side, shown in Figure 1A, Figure 1A-1, Figure 1B, Figure 1B-1, the width of Da Ye monopole ear must not be greater than half (1/2) of the length of side on residing that limit of lug.

Can utilize fold line 20 to make it become the Da Ye lug, concrete grammar is to strengthen the width of fold line 20 and scrape off its double-edged active material and make it become the Da Ye lug.Generally, only need widen the width of a fold line 20 or a fold line 20-1 fold line wherein and scrape off its double-edged active material and get final product, like this, the lug of positive pole can be drawn from another side.If the power of lithium-ion-power cell is big especially, must widen the width of fold line 20 and fold line 20-1 and scrape off its double-edged active material, then Zheng Ji Da Ye lug can be drawn from other side.The Da Ye lug of both positive and negative polarity can each be drawn since the side of the different directions of pole piece.The Breadth Maximum of the Da Ye lug of drawing from the side of pole piece different directions can be isometric with that limit at Da Ye lug place, helps water conservancy diversion, the heat radiation of lithium-ion-power cell more.

From the complexity of processing and the angle of quality control, the positive/negative plate of folding lithium ion electrokinetic cell is comparatively suitable only at single face coating active material.Shown in figure one AB, the positive/negative plate of single face coating is long and narrow rectangular sheet (generate sheet), each with the face that has been coated with active material be close together (middle lining with barrier film 19) simultaneously folding relatively, inwardly burst all is processed with fold line 20 and scrapes off active material on it.The pole piece precision of this single face coating is higher, and the effect of body also can be better in forming.The Da Ye lug of the positive/negative plate of single face coating is the adjacent lug that can overlap, and also can become the disjunctor lug.

Generally, the maximum height of Da Ye lug is not more than himself (the Da Ye lug) width, preferably less than its width.Certainly, the height of Da Ye lug is the smaller the better.

The lug of the electrokinetic cell of larger capacity; relatively than the lug of the electrokinetic cell of low capacity; from the performance of water conservancy diversion, heat radiation, high power charging-discharging, obviously want more roomy and just can meet the demands, so the Da Ye lug is positioned on the long limit of positive/negative plate usually or as far as possible.The Da Ye lug is positioned on the long limit of positive/negative plate, and aunt is called horizontal, if the Da Ye lug is positioned on the short limit of positive/negative plate, then can be described as vertical.From the afflux performance, horizontal is better than vertical, so under the situation of condition permission, should adopt horizontal as far as possible.

In fact, as long as guarantee not to be short-circuited, as required, the multipole ear of Da Ye can be arranged at arbitrarily on the long limit or any position on the minor face of positive and negative plate.

If the Da Ye monopole ear on the positive/negative plate is for example upwards drawn from same direction, as shown in the figure, the position of center line of Da Ye monopole ear should be positioned at about 1/4 place or 3/4 place on the length of side of laminated type positive and negative plate as far as possible.The inner edge line of the Da Ye lug center line near pole piece of should trying one's best, but can not hinder the lug of another utmost point must take insulation measures to prevent lug contact short circuit with another utmost point.

The positive/negative plate of folding lithium ion electrokinetic cell is cut into rectangular sheet usually.The length-width ratio of anodal rectangular sheet the best is 6.2: 3.8 or 6: 4, and the length-width ratio of the best of rectangular sheet also is 6.2: 3.8 or 6: 4 between the fold line 20/20-1 of negative pole.The shape of positive/negative plate also can be made into circle or other shapes that needs except that rectangle.

The size of positive and negative plate is different because of its technological requirement, because the price of anodal active material 13-2 is more than the active material 12-2 costliness of negative pole, so when cutting, take all more bigger way of length and width of negative plate than positive plate, both save resource, given full play to anodal material performance again.

Positive pole 13, negative pole 12 directly are cut into the rectangular sheets that have Da Ye monopole ear or the multipole ear of Da Ye usually.The manufacture method of Da Ye lug except that cutting, can also rolling cut or the mode of shearing punching press directly process the pole piece of moulding.

Generally, the width of the width of the Da Ye lug on the positive pole 13 and the Da Ye lug on the negative pole 12 is wide.Certainly, separately the width of Da Ye lug can be not wide under specific (special) requirements yet on the positive/negative plate.The lithium-ion-power cell of larger capacity is under the quick high-power situation about discharging and recharging of needs, and the lug width on the positive/negative plate should equate.Need not under the situation of high power discharge in the quick high-power charging of needs, the width of the Da Ye lug on the negative pole 12 can be greater than the Da Ye lug on anodal 13; Need not needing high power discharge under the situation of quick high-power charging, the width of the Da Ye lug on the positive pole 13 can be greater than the width of the Da Ye lug on the negative pole 12.

The Da Ye lug both can be that angle (being that the junction is right angle, the obtuse angle that does not have circular arc) is connected clearly with the junction of collector, also can make smooth circular arc and connect (being that the junction has the R angle), the R of junction shown in the figure, not only have higher mechanical strength, help also preventing that heat from concentrating and cause fusing lug even meltdown pole piece.

No matter the manufacture method of lug is lug 10/11 or the lug through welding that directly cuts, and is and raises hair style, and visible lug is apparently higher than the part of pole piece coating active material, and its advantage is to be convenient to scrape powder.The form of hiding the hair style lug is by chance opposite with the form of raising the hair style lug.

Da Ye lug (raise hair style, hide hair style) can be on the long limit of the positive/negative plate of rectangle, also can be on the minor face of positive/negative plate, and from the reasonability consideration, the Da Ye lug should be as far as possible on the long limit of positive/negative plate.

For the thin lug of high temperature fusing that prevents that lithium-ion-power cell from producing when high-power the discharging and recharging, the method that can weld shown in Figure 1B, Figure 1B-1 is made lug (15/16), can weld by the number of metal sheet during welding, both increase mechanical strength, improved guide performance, improved heat dispersion again.Weld 14 must be firmly.The advantage of soldering polar ear is that the pole piece burr that cuts is less.Therefore, make the Da Ye lug and preferably adopt welding Da Ye lug.Weld the material of used lug, aluminum just very, negative pole is nickel system or copper.

That the shape of Da Ye lug optionally can design, be processed as is square, rectangle, semicircle, trapezoidal or other help the shape of water conservancy diversion, heat radiation, best lug is shaped as the junction and has the trapezoidal of R fillet.

The basic role of barrier film is that positive and negative electrode is isolated, and prevents battery short circuit, and absorption also keeps electrolyte.Barrier film except that having good insulation performance performance, stable chemistry and chemical property, certain mechanical strength must be arranged, higher conductivity also must be arranged, so adopt porous TPO material the most suitable.In view of the high-power characteristics that discharge and recharge of lithium-ion-power cell palpus, require to have higher security performance.

The lithium-ion-power cell that the utility model relates to mainly adopts the polyethylene barrier film with 15～80 low μ m thickness of microcellular structure and failure of current temperature.The principle of selecting for use of barrier film is to get over Bao Yuehao, but when the area of negative or positive electrode pole piece be less than or equal to 1000mm * 500mm and more than or equal to 100mm * 50mm, discharge and recharge when requiring 1C～2C, get rid of other influencing factors, the optimum thickness of barrier film is 20 μ m μ m～40 μ m; Discharge and recharge and require 3C or when bigger, get rid of other influencing factors, the optimum thickness of barrier film be 40 μ m or more than.When internal temperature of battery is higher than limit value (no matter whether because of short circuit cause), have the promptly molten voluntarily micropore that closes of barrier film of this characteristics, the passage of blocking-up lithium ion, battery no longer reacts.The barrier film that the barrier film that lithium-ion-power cell is selected for use also can adopt polypropylene material to make.

The barrier film of lithium-ion-power cell also can adopt positive plate surface (the also available method of immersing after the slurry of the TPO material of the pore creating material that directly will contain reasonable amount evenly is coated in roll extrusion, positive plate is immersed in the above-mentioned slurry), again positive plate is put into specific solvent extraction pore creating material and formed satisfactory barrier film with the positive plate one.

Barrier film is made the rectangular sheet consistent with the positive/negative plate shape usually.Because the area of all positive poles 13 is all smaller than the area of negative pole 12, so wrap anodal 13 with barrier film.Barrier film is made pouch 19 usually, so that positive pole 13 is packed into or clamp.Bag shape barrier film can seal three limits, also can only seal two adjacent limits; The barrier film that only seals adjacent two edges is easier to assembling.

The positive/negative plate of single face coating is long and narrow rectangular sheet (generate sheet), so its corresponding barrier film 19 also is long and narrow rectangular sheet.

No matter the area of barrier film is grown or is wide all greater than positive/negative plate, and except that lug, barrier film 19 must can not expose the edge, in case short circuit with encasing fully around the positive plate 13.

The material of lithium-ion-power cell pole except that certain intensity should be arranged, also must have good performance of heat dissipation for conduction, the good metal material of heat conductivility.Pole can also can adopt sheet for outside cylindrical, dispels the heat quickly with convenient lithium ion power.

In different needing under the situation, pole can be installed on any side surface of lithium-ion-power cell; In response to different needs, positive and negative terminals also can be installed on the different side surface of lithium-ion-power cell.

Generally, positive terminal of lithium-ion-power cell, a negative terminal can be satisfied the demand.For in response to the high-power needs that discharge and recharge, the pole of the lithium-ion-power cell of larger capacity can be installed more pole and satisfy, and two Positive Poles for example is installed simultaneously, two negative pole poles.When needs were installed several poles, the quantity of positive and negative terminals can equate, also can not wait.Under the quick high-power situation about discharging and recharging of needs, the quantity of positive and negative terminals should equate; Need not under the situation of high power discharge in the quick high-power charging of needs, the quantity of negative pole pole can equate with the quantity of Positive Poles or greater than the quantity of Positive Poles; Need not needing high power discharge under the situation of quick high-power charging, the quantity of Positive Poles can equate with the quantity of negative pole pole or greater than the quantity of negative pole pole.

The diameter that also can adjust pole satisfies above-mentioned needs, and for example under the quick high-power situation about discharging and recharging of needs, the diameter of positive and negative terminals should equate; Need not under the situation of high power discharge in the quick high-power charging of needs, the diameter of negative pole pole can be with the equal diameters of Positive Poles or greater than the diameter of Positive Poles; Need not needing high power discharge under the situation of quick high-power charging, the diameter of Positive Poles can be with the equal diameters of negative pole pole or greater than the diameter of negative pole pole.

Lithium-ion-power cell adopts polynary electrolyte, can adapt to wideer variations in temperature.Polynary electrolyte refers to two or more solvent bodies to be mixed with lithium hexafluoro phosphate.What lithium-ion-power cell adopted is:

(1), LIPF6 (lithium hexafluoro phosphate)/EC (vinyl carbonate): DMC (dimethyl carbonate): DEC (diethyl carbonate), solvent ratios is 0.95～1.05: 0.95～1.05: 0.95～1.05; Or

(2), LIPF6/EC: EMC (ethyl-methyl carbonic ester): DEC), solvent ratios is 0.95～1.05: 0.95～1.05: 0.95～1.05; Or

(3), LIPF6/EC: DMC: EMC, solvent ratios is 0.95～1.05: 0.95～1.05: 0.95～1.05; Or

(4), LIPF6/EC: DMC: EMC: DEC, solvent ratios is 0.95～1.05: 0.95～1.05: 0.95～1.05: 0.95～1.05.

The lithium-ion-power cell shell that the utility model relates to is the part of lithium-ion-power cell, is also referred to as electric core shell.In less battery, electric core shell also is the utmost point in the positive and negative electrode, and in the case, electric core shell is also referred to as electrode shell.Unless essential in the design, the electric core shell of high-power lithium ion electrokinetic cell should avoid becoming electrode shell as far as possible.Generally, the electric core shell of high-power lithium ion electrokinetic cell can not become electrode shell, and shell must insulate with pole.But under special circumstances, shell also can become electrode shell.

The square shell 9 of lithium-ion-power cell is made up of several planes.

The air-tightness of electric core of lithium ion power battery shell is had relatively high expectations, and higher intensity will be arranged, and is generally the metal-back of certain rigidity, for example the stainless steel electric core shell.The electric core shell of lithium-ion-power cell of the present utility model both can be a metal-back, also can polytetrafluoroethylene or polypropylene or other suitable plastic make, bonding forming also can injection mo(u)lding, security performance more is better than the metal electric core shell.

The shell of lithium-ion-power cell also can adopt flexible package except adopting (for example stainless steel casing) the rigid package.

The shell top or the lateral layout of lithium-ion-power cell are processed with the port that patches of being convenient to series, parallel, and making things convenient for the battery serial or parallel connection is battery pack.

If the heat that lithium-ion-power cell produces down in working order can not in time distribute, safety, the cycle life of battery all there is harmful effect.Especially when numerous batteries were arranged in parallel, the heat of generation was bigger, and heat dissipation problem is more obvious, so can be processed with laterally or longitudinally or crisscross wind guide tank on square shell, helped dispelling the heat as early as possible.

For heat radiation as early as possible, fin (heat bridge) 9-1 can be designed, be processed with on the shell or its inside.

The cover plate of lithium-ion-power cell must coincide with electric core shell, and air-tightness is had relatively high expectations.The cover plate of lithium-ion-power cell also can polytetrafluoroethylene or polypropylene or other any anti-strong acid and the plastics manufacturing of certain intensity is arranged, injection mo(u)lding.

The safety valve 3 of lithium-ion-power cell is most important, be for prevent to overcharge, the set safety device of other contingencies such as short circuit, can shed the pressure that exceeds design in moment.The pressure relief vent of safety valve bottom also is the liquid injection port of lithium-ion-power cell.

Relating to safety valve of the present utility model has two kinds, and one is with spring (compressed spring type) do to reset mechanism such as Fig. 5-1,5-2,5-3,5-4,5-5; Another is with anti-bow shell fragment (compressing tablet formula) do to reset mechanism such as Fig. 6-1,6-2,6-3,6-4,6-5,6-6.Division is as follows:

The structure of compressed spring type safety valve such as Fig. 5-1,5-2.Stage clip (spring) 25 is loaded in the endoporus of regulating bolt 23, the endoporus of regulating bolt is actually the retainer of stage clip, sealed steel ball 22, stage clip can be in regulating the endoporus of bolt vertically slippage and can not teeter up and down, sealed steel ball also can be in the endoporus of regulating bolt vertically slippage and can not teeter up and down.Be processed with the screw thread that matches with safety valve body 21 on the external diameter of adjusting bolt, be contained on the safety valve body so regulate bolt, can be by keyhole 27 regulated at will height, keyhole has the effect of exhaust concurrently.Regulate bolt when rotation and exert pressure and give stage clip, sealed steel ball is promptly fixed by stage clip.Regulate bolt and be processed with some vertical air discharge ducts 24, can turn the adjusting bolt by air discharge duct and make it rotation, then have steam vent 28 in the bottom of air discharge duct.Orlop is fluorine rubber ring 26 or other corrosion resistant cushion rubber pads, is pressed in or is attached on the liquid injection hole on the lithium ion battery cover board 1, and sealed steel ball then falls into and is pressed on fluorine rubber ring 26 or other the corrosion resistant cushion rubber pads.The pressure relief vent of safety valve bottom communicates with the liquid injection hole on the cover plate 1, so pressure relief vent is liquid injection hole when fluid injection.

Fluorine rubber ring or other corrosion resistant cushion rubber pads remove must certain elasticity, so that sealed steel ball is when compressing the corrosion resistant cushion rubber pad of fluorine rubber ring or other, fluorine rubber ring or other corrosion resistant cushion rubber pads produce certain distortion and the salable liquid injection hole of living.Stage clip is just withheld on sealed steel ball top with its bottom inner ring, and the bottom of sealed steel ball then falls on the fluorine rubber ring 26 or other corrosion resistant cushion rubber pads that is pressed on the battery cover board, and the constraint sealed steel ball can not slip off.When lithium-ion-power cell pressure inside during less than set point, sealed steel ball seals liquid injection port automatically because of the pressure of stage clip, keep inside battery and external environment condition to isolate, and when the pressure of inside battery during greater than set point, can back down the sealed steel ball release automatically, gas can be discharged from pressure relief vent 29 in moment, overflowed along air discharge duct 24 along steam vent 28.After interior pressure shed, the pressure of stage clip was enough to compress once more sealed steel ball, thereby pressure relief vent is sealed up.

The structure of compressing tablet formula safety valve such as Fig. 6-1,6-2.The anti-shell fragment 30 that bends of semilune (the anti-shell fragment that bends can be processed as plate shaped as required) is loaded on the bottom of regulating bolt 23, regulate bolt and be processed with the screw thread that matches with safety valve body 21, so regulating bolt is contained on the safety valve body, the bottom is pressed on the anti-bow shell fragment, can regulate the height of bolt by turning keyhole 8, adjust the tension force of anti-bow shell fragment.Be processed with a rectangular air discharge duct 31 in the safety valve body, the anti-shell fragment that bends is contained in the rectangular groove except that springing up and down, can not horizontally rotate.The bottom internal diameter of safety valve body is less, forms retainer, and sealed steel ball 22 is vertically slippage up and down in retainer.Be processed with technology pilot hole 33 on the anti-bow shell fragment, just in time withhold at the top of steel ball fixing seal steel ball.The bottom hole of sealed steel ball then falls on the fluorine rubber ring or other corrosion resistant cushion rubber pads that is pressed on the cover plate liquid injection port, has both fixed sealed steel ball, has also sealed up battery.

Fluorine rubber ring or other corrosion resistant cushion rubber pads remove must certain elasticity, so that sealed steel ball is when compressing the corrosion resistant cushion rubber pad of fluorine rubber ring or other, fluorine rubber ring or other corrosion resistant cushion rubber pads produce certain distortion and the salable liquid injection hole of living.Stage clip is just withheld on sealed steel ball top with its bottom inner ring, and the bottom of sealed steel ball then falls on the fluorine rubber ring 26 or other corrosion resistant cushion rubber pads that is pressed on the battery cover board, and the constraint sealed steel ball can not slip off.When lithium-ion-power cell pressure inside during less than set point, sealed steel ball seals liquid injection port automatically because of the pressure of stage clip, keep inside battery and external environment condition to isolate, and when the pressure of inside battery during greater than set point, can back down the sealed steel ball release automatically, gas moment can discharge from pressure relief vent 29, along air discharge duct 31 from steam vent 32 and keyhole 27 overflow.After interior pressure shed, the anti-pressure that bends shell fragment was enough to compress once more sealed steel ball, thereby pressure relief vent is sealed up.

Anti-bow shell fragment can design, be processed into plate shaped anti-bow shell fragment.The operation principle of plate shaped anti-bow shell fragment is just like the anti-shell fragment that bends of semilune.

The pressure of compressing tablet formula safety valve can also be by the tensioning state of the anti-bow of 34 fine settings of the screw shown in Fig. 6-2 shell fragment.

For exhaust more promptly, safety valve also can be designed as and be processed with some exhaust holes 35 separately on body.

Liquid injection hole on pressure relief vent 29 on the fluorine rubber ring 26 and the cover plate 1 is through hole mutually, and also the pressure relief vent with the safety valve bottom communicates, so do not mark separately.

Fluorine rubber ring 26 can replace by other any suitable cushion rubbers.

Anti-bow shell fragment can design, be processed into plate shaped or as the anti-shell fragment that bends of the semilune of Fig. 6-1.The operation principle of plate shaped anti-bow shell fragment is identical with the anti-shell fragment that bends of semilune.

No matter compressed spring type safety valve or compressing tablet formula safety valve, sealed steel ball 22 all can design, be processed as the spheroid 22-1 that has horizontal translot, and fluorine rubber ring 26-1 is then in the horizontal translot of banding on sealed steel ball 22-1.Stage clip or the anti-shell fragment that bends are when depressing sealed steel ball 22-1, and fluorine rubber ring 26-1 then seals up liquid injection hole.In order to prevent sealed steel ball 22-1 swing, also can process a fixing stalklet 35 thereon, stage clip or the anti-shell fragment that bends are enclosed within fixedly on the stalklet.When interior pressure during less than permissible value, stage clip or the anti-shell fragment that bends are then pushed down sealed steel ball 22-1, and fluorine rubber ring 26-1 closely seals liquid injection hole.When interior pressure greater than permissible value, during jack-up sealed steel ball 22-1, fluorine rubber ring 26-1 then upwards lifts simultaneously with it, sheds interior pressure rapidly.

Sealed steel ball 22 also can design, be processed as sealing frustum 22-2.Compare with steel ball 22 or 22-1, liquid injection hole is stretched in the bottom of sealing frustum, thereby it is more reliable to reset.Sealing also can be processed with fixedly stalklet 36 on the frustum, and stage clip or the anti-shell fragment that bends are enclosed within fixedly on the stalklet.When interior pressure during less than permissible value, stage clip or the anti-shell fragment that bends are then pushed down sealing frustum 22-2, closely seal liquid injection hole thereby fluorine rubber ring 26 produces deformation at the pressure of sealing frustum.When interior pressure greater than permissible value, during jack-up sealing frustum 22-2, shed interior pressure rapidly.The sealing frustum also can design, be processed as 22-3, and a horizontal translot is arranged on it, and fluorine rubber ring 26-1 is then in the horizontal translot of banding on sealing frustum 22-3.Stage clip or the anti-shell fragment that bends are depressed when sealing frustum 22-3, and fluorine rubber ring 26-1 then seals up liquid injection hole.When interior pressure greater than permissible value, during jack-up sealing frustum 22-3, fluorine rubber ring 26-1 then upwards lifts simultaneously with it, sheds interior pressure rapidly.

Fixedly stalklet 36 on sealed steel ball 22 or 22-1 or sealing frustum 22-2, the 22-3 also can be designed to cannulated sleeve, and stage clip is packed in the better cannulated sleeve of steering capability.

Generally, safety valve and pole should be installed on the same side surface of lithium-ion-power cell shell, only as required, also can be installed in different side surfaces.

In response to different needs, safety valve, pole can be installed on any side surface of lithium-ion-power cell.

For safety, the lithium-ion-power cell of larger capacity can be installed several safety valves at same side surface or different side surfaces.

Claims

1. rechargeable lithium-ion-power cell, each cell is made up of cover plate (1), negative pole pole (2), safety valve (3), Positive Poles (4), electrolyte (8), shell (9), Positive Poles (4) is connected with anodal (13), and negative pole pole (2) then is connected with negative pole (12); Anodal (13) select certain thickness aluminium foil for use, and the two sides evenly is coated with positive active material, and negative pole (12) is selected certain thickness Copper Foil for use, and the two sides evenly is coated with negative electrode active material; It is characterized in that: interior body (7) be by a comparatively long and narrow and folding negative plate (12), some anodal piece sheets (13) and barrier film (19) common constitute have multiple lamination structure, the positive and negative plate sequence interval is put neat electrode aggregate; Anodal (13) also can be the generate sheet that can relatively back and forth fold, shape is long and narrow, and then negative pole (12) is the piece sheet; The pole piece form of negative or positive electrode is the rectangular sheet that has Da Ye monopole ear or the multipole ear of Da Ye, and passes through current collection clamping plate (6) derived current to pole; Positive pole has one or several poles, and negative pole has one or several poles, and the quantity of positive and negative terminals can equate also can not wait, the diameter of pole can equate also can not wait; The shape of pole is installed on same or different any surface of shell (9) except that can also adopting sheet for cylindrical; The shape of positive/negative plate also can be made into other shapes except that rectangle; Positive plate (13) and negative plate (12) must wall is stacked be put; Interior body (7) outermost layer both sides both can be negative plate, also can be positive plates; Interior body (7) must closely wrap up or clamp with polyethylene, polypropylene frame with barrier film; Positive pole ear (11) proper alignment is parallel to an end of interior body (7), the other end of body in negative lug (10) proper alignment is parallel to; Anodal (13) or negative pole (12) can be selected the net metal paper tinsel separately for use; The active material of anodal (13) both can be a cobalt acid lithium, also can be LiMn2O4, lithium nickelate or lithium nickel cobalt dioxide; The active material of negative pole (12) both can be a native graphite, also can be crystalline flake graphite, Delanium or petroleum coke.

2, rechargeable lithium-ion-power cell according to claim 1 is characterized in that: the density of anodal (13) active material is 0.02g～0.06g for every square centimeter, is preferably 0.032g～0.042g; The density of negative pole (12) active material is about 0.01g～0.03g for every square centimeter, is preferably 0.014g～0.021g.

3, rechargeable lithium-ion-power cell according to claim 1 is characterized in that: the anodal piece sheet (13) of monolithic does not have fold line; On the long and narrow and negative plate (12) that can fold continuously of shape some fold lines that are folded to are on the contrary arranged, fold line (20) is inwardly folding and must scrape off corresponding active material; Having under the situation about needing, anodal (13) can and be processed with fold line (20) for disjunctor piece sheet; The fold line (20) of negative pole (12) and the area between the fold line (20-1) are a bit larger tham the area of positive pole (13), and consist of the positive/negative plate group with corresponding positive pole (13); Folding relatively to clamp positive pole (13) be interior body (7) to negative pole (12) along the center line of fold line; Positive/negative plate all can be only at single face coating active material; Positive pole (13), the negative pole (12) of single face coating is long and narrow rectangular sheet and all is processed with fold line (20).

4, rechargeable lithium-ion-power cell according to claim 1 is characterized in that: the Da Ye lug on the negative pole (12) is adjacent lug, and the adjacent lug in folding back can overlap; Adjacent Da Ye lug can also be the disjunctor lug; The Da Ye lug of the positive pole (13) of disjunctor piece sheet is adjacent lug, can also be the disjunctor lug; The adjacent lug of Da Ye lug for overlapping of the positive pole (13) of single face coating also can become the disjunctor lug; If the Da Ye lug on the positive/negative plate is drawn from same direction or same side, the Breadth Maximum of Da Ye monopole ear must not be greater than half of the length of side on that limit at Da Ye lug place; If the Da Ye lug on the positive/negative plate is drawn from same direction or same side, the position of center line of Da Ye monopole ear should be positioned at about 1/4 place or 3/4 place on the length of side of laminated type pole piece; The Da Ye lug of both positive and negative polarity can each be drawn since the side of the different directions of pole piece, and from the Da Ye lug that the side of pole piece different directions is drawn, its Breadth Maximum can be isometric with that limit at Da Ye lug place; The Da Ye lug can also be made and be welded on the pole piece after the pole piece roll extrusion except that can directly cutting separately, preferably adopts welding Da Ye lug; The shape of Da Ye lug can for square, rectangle, semicircle, trapezoidal or other help the shape of water conservancy diversion, heat radiation, optimum shape is have the R angle trapezoidal; The lug root both can connect for smooth circular arc for clear angle is connected also with the junction of pole piece; The Da Ye lug both can also can be the Tibetan hair style for raising hair style; Raising hair style or hide hair style Da Ye lug both can be on the long limit of rectangular sheet, also can be on the minor face of rectangular sheet; Can also strengthen the width of fold line (20) and scrape off the corresponding double-edged active material in fold line place makes it become the Da Ye lug.

5, rechargeable lithium-ion-power cell according to claim 1 is characterized in that: generally, the maximum height of Da Ye lug is not more than himself width, preferably less than its width.

6, rechargeable lithium-ion-power cell according to claim 1 is characterized in that: some wire casings that can be compressed and can flick are arranged on the integral type current collection clamping plate; Split type current collection clamping plate are by series connection bar (20) series connection with some separate sheet metals; No matter integral type current collection clamping plate or split type current collection clamping plate, the current collection clamping plate should cover lug, its with surface that lug contacts on be processed with the quil of projection.

7, rechargeable lithium-ion-power cell according to claim 1 is characterized in that: barrier film (19) adopts polyethylene or the polypropylene material with the low 15 μ m～80 μ m thickness of microcellular structure and failure of current temperature; Barrier film make usually adapt to double spread and can three heat-sealing, also can only seal bag shape barrier film (19) on adjacent both sides; Barrier film (19) also may be made in the long and narrow rectangular sheet of suitable single face coating; No matter the area of barrier film (19) is grown or is wide all greater than positive/negative plate, and except that lug, barrier film (19) must cover positive plate (13) or negative plate (12) all around fully, can not expose the edge, in case short circuit; When discharging and recharging when requiring 1C～2C, the optimum thickness of barrier film (19) is 20 μ m～40 μ m; Discharge and recharge and require 3C or when bigger, the optimum thickness of barrier film be 40 μ m or more than.

8. safety valve that is used for rechargeable lithium-ion-power cell, it is characterized in that: stage clip wherein (25) is loaded in the endoporus of regulating bolt (23), the endoporus of regulating bolt is used to keep the stable of stage clip, sealed steel ball (22), stage clip (25) can vertically slippage up and down in regulating the endoporus of bolt, sealed steel ball (22) can vertically slippage up and down in regulating the endoporus of bolt, regulates on the external diameter of bolt and is processed with the screw thread that matches with safety valve body (21); Regulate bolt and be processed with some vertical air discharge ducts (24), then have steam vent (28) in the bottom of air discharge duct; Stage clip (25) is pressed in the top of steel ball, and the bottom hole of sealed steel ball (22) then falls on the fluorine rubber ring (26) that is pressed on the cover plate liquid injection port; The pressure relief vent of safety valve bottom communicates with the liquid injection hole on the cover plate (1); Stage clip (25) also can instead bend shell fragment (30) and replace, and the anti-shell fragment (30) that bends is loaded on the bottom of regulating bolt (23), regulates bolt and is processed with the screw thread that matches with safety valve body (21), adjusts the tension force of anti-bow shell fragment by turning keyhole (27); Be processed with a rectangular air discharge duct (31) in the safety valve body, counter bend shell fragment (30) can be in air discharge duct springing and can not horizontally rotating up and down; Sealed steel ball (22) is vertically slippage up and down in the retainer of safety valve body, be processed with technology pilot hole (33) on the anti-bow shell fragment (30), withhold the top at steel ball, the bottom hole of sealed steel ball (22) then falls on the fluorine rubber ring (26) that is pressed on the cover plate liquid injection port; The pressure relief vent of safety valve bottom communicates with the liquid injection hole on the cover plate (1); Can be processed with exhaust hole (35) separately on the safety valve body (21); Sealed steel ball then can be processed as the spheroid (22-1) that has horizontal translot, in the horizontal translot of fluorine rubber ring (26-1) banding on sealed steel ball (22-1); Sealed steel ball (22) can be processed as sealing frustum (22-2); Sealing frustum (22-3) can be processed a horizontal translot, and fluorine rubber ring (26-2) is then in the horizontal translot of banding in sealing frustum (22-3); Safety valve can be installed on any surface of shell (9); The lithium-ion-power cell of larger capacity can be installed several safety valves at same side surface or different side surfaces; Generally, safety valve (3) both can be installed on the same surface of shell (9) with pole, also can be installed on the different surfaces.