CN101286577A - Lithium ion power cell with high power - Google Patents
Lithium ion power cell with high power Download PDFInfo
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- CN101286577A CN101286577A CNA2008101126336A CN200810112633A CN101286577A CN 101286577 A CN101286577 A CN 101286577A CN A2008101126336 A CNA2008101126336 A CN A2008101126336A CN 200810112633 A CN200810112633 A CN 200810112633A CN 101286577 A CN101286577 A CN 101286577A
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 17
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000011889 copper foil Substances 0.000 claims abstract description 4
- 230000005611 electricity Effects 0.000 claims description 16
- 239000000178 monomer Substances 0.000 claims description 16
- 230000004888 barrier function Effects 0.000 claims description 11
- 239000005030 aluminium foil Substances 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 9
- 210000005069 ears Anatomy 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 239000002390 adhesive tape Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 229910001369 Brass Inorganic materials 0.000 claims description 2
- 239000010951 brass Substances 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- -1 polytetrafluoroethylene Polymers 0.000 claims 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims 2
- 229920001617 Vinyon Polymers 0.000 claims 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052744 lithium Inorganic materials 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 1
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- 210000001787 dendrite Anatomy 0.000 abstract 1
- 239000011888 foil Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 239000011230 binding agent Substances 0.000 description 8
- 239000006229 carbon black Substances 0.000 description 8
- 239000007787 solid Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000007599 discharging Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000005405 multipole Effects 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 229910002097 Lithium manganese(III,IV) oxide Inorganic materials 0.000 description 2
- 238000001467 acupuncture Methods 0.000 description 2
- 238000000627 alternating current impedance spectroscopy Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000007755 gap coating Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 238000011076 safety test Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000004260 weight control Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a high-power lithium ion power battery, comprising a plurality of single electrical cores connected in parallel. Each single electrical core consists of an anode plate, a cathode plate, a separator film, and two to eight anode tabs and cathode tabs. The anode tabs and the anode plate are integrated as a whole which is punched on the aluminum foil of the current collector of the anode; the cathode tabs and the cathode plate are integrated as a whole which is punched on the copper foil of the current collector of the cathode. All the tabs of the anodes of the single electrical cores are welded on a positive pole, while all the tabs of the cathodes are welded on a negative pole. By the structure of a variety of single electrical cores connected in parallel and a plurality of tabs integrated as a whole, the high-power lithium ion power battery leads the total essential resistances of the batteries to be further reduced and the currents of the anode and cathode plates to be distributed more uniformly, as a result, the high-power lithium ion power battery has the advantages of small essential resistances in total, high discharge rate, lower possibility of forming lithium dendrites, long cycle life and high specific power etc., and is widely used in electric vehicles, electric tools and other equipment in need of high-power batteries.
Description
Technical field
The present invention relates to lithium-ion-power cell, especially be designed for the high-power lithium ion electrokinetic cell that electric vehicle and electric tool etc. use.
Background technology
Early 1990s, a kind of novel energy storage system---lithium ion battery begins to move to maturity and come into the market, be characterized in high power capacity, long-life, pollution-free, but at that time, its expensive price and the hidden peril of explosion that may exist have seriously limited its range of application in daily life, wherein just comprise the electric vehicle field.After having passed through ten years development, the lithium-ion electric pool technology has been obtained significant progress, but still have some technical problems thoroughly not solve, thereby the electric motor car in the whole nation about 90% is also using lead-acid battery big for environment pollution, that the life-span is short, energy density is low.
In recent years, increasing technical force and fund input have been arranged in the research and development of lithium-ion-power cell, and obtained certain achievement: in order to improve the problem of the big multiplying power discharging difficulty of coiled battery, people use the mode of the bigger lug of ultra-sonic welded sectional area to reduce internal resistance, and improve the performance of battery when the big multiplying power work, thereby multipole ear welded structure has been arranged by welding many lugs; In order to solve the long problem that is difficult for coiling of high capacity cell pole piece, people have invented stack type lithium ion battery, thereby battery has had takeup type and stacked branch.
Above-mentioned improvement has improved battery performance really, but also has significant disadvantages:
For the takeup type high power battery, because the thickness that lug adds the lug adhesive tape is generally greater than the thickness of electrode material coating, make the positive/negative plate of lug periphery can't well contact and make the position swell at lug place in the electric core, influence the uniformity and the stability of pole piece, and then influenced the life-span of battery; This structure also can cause the utmost point lug situation relative with another utmost point coating, makes that the gap forms lithium easily around the negative lug to prop up the brilliant fail safe that influence, and the lug number of pole piece welding is many more, and the problems referred to above are just serious more.At this problem, someone in cylindrical battery, take to shorten lug and pole piece overlap length and with external force compacting lug and pole piece overlapping to reduce the method for difference in height, this method adopts big lug with big multiplying power battery and pole piece is overlapping and bonding area and thicker lug contradict, the effect that this method can obtain in big multiplying power electrokinetic cell field is limited, and can not thoroughly solve the problem of the local swell of electric core that lug thickness causes.
For stacked high power battery, the pole piece homogeneity question that does not have coiled battery to cause because of lug, the also problem of the local swell of electric core that does not cause because of lug, but the right pole piece of each battery 40-100 divides cutting process, Weight control operation, barrier film encapsulation negative plate operation and last battery lamination welding sequence process loaded down with trivial details at pole piece, workload is big, and its defect rate is much higher than coiled battery.Too much in addition lug also is very big challenge for the welding of lug and pole.
Except above-mentioned improvement, the electric core that will be welded with the wall scroll lug in addition composes in parallel the method for battery, and it has simplified the production difficulty to a certain extent, has increased total lug number, but still can't thoroughly break away from all problems that multipole ear winding formula battery faces.
Summary of the invention
The objective of the invention is to defective at the prior art existence, manufacture method and a kind of high-power lithium ion electrokinetic cell of the high-power lithium ion electrokinetic cell of a kind of how electric core, many integral types lug are provided, it has, and total internal resistance is little, discharge-rate is high, be difficult for forming lithium Zhi Jing, have extended cycle life advantage such as specific power is big.
Description of drawings
Fig. 1 is the structural representation in high-power drive of the present invention pond;
Fig. 2 is positive plate (a 2) schematic diagram;
Fig. 3 is negative plate (a 4) schematic diagram;
Fig. 4 is monomer electricity core (a 1) schematic diagram.
Fig. 5 is that example 1 positive plate (2) is cut and die-cut schematic diagram;
Fig. 6 is that example 3 positive plates (2) are cut and die-cut schematic diagram;
Wherein, in above-mentioned schematic diagram, drafting be illustrative might not be fully according to actual size, in order to make the clear more or outstanding some of them parts of accompanying drawing, may enlarge some parts with respect to miscellaneous part.
Embodiment
Describe according to a plurality of embodiment of the present invention below in conjunction with accompanying drawing.
The concrete structure of the monomer electricity core of battery of the present invention is described at first with reference to the accompanying drawings.
As shown in Figure 2, positive plate (2) has 2-8 bar positive pole ear (3) on a longest edge, this positive pole ear and collector aluminium foil are one, die-cut obtaining the aluminium foil of reserving from when coating, and by calculating and test guarantees that these positive pole ears are fully overlapping from seeing perpendicular to the direction of barrier film behind coiling.
As shown in Figure 3, negative plate (4) has 2-8 bar negative lug (5) on a longest edge, this negative lug and copper foil of affluxion body are one, and die-cut obtaining the Copper Foil of reserving from when coating, and by calculating and test guarantees that these negative lug are fully overlapping from seeing perpendicular to the direction of barrier film behind coiling.
As shown in Figure 4, positive plate (2), barrier film (12) and negative plate (4) are reeled by up-coiler and are formed monomer electricity core (1), the width of its septation (12) is greater than the width of positive plate (2) and negative plate (4), all positive pole ears (3) are folded from finish watching full weight perpendicular to the direction of barrier film, all negative lug (5) are folded from finish watching full weight perpendicular to the direction of barrier film, and the centre-to-centre spacing of all positive pole ears (3) and negative lug (5) equals the centre-to-centre spacing of Positive Poles (7) and negative pole pole (8).Because not at pole piece surface soldered lug, thereby the pole piece surface is smooth fully, the monomer electricity core (1) that winds also is fully smooth, and this has just guaranteed that the positive/negative plate of electric core can well contact and the stressed unanimity of any position.Simultaneously, also avoided multipole ear battery one utmost point lug of the common coiling problem relative, greatly improved the consistency of pole piece, reduced lithium and propped up the brilliant possibility that forms with another utmost point coating.
As shown in Figure 1,5-20 monomer electricity core (1) is overlapping perpendicular to the direction of barrier film towards the edge according to identical lug, make from direction perpendicular to barrier film, the positive pole ear (3) of all monomer electricity cores (1) is overlapping fully and negative lug (5) is overlapping fully, pastes the lug adhesive tape in case short circuit on the lug of outermost.All positive pole ears (3) are ultrasonically welded within Positive Poles (7) bottom, and the welding pattern area is more than or equal to 2mm
2, all negative lug (5) are ultrasonically welded within negative pole pole (8) bottom, the welding pattern area is more than or equal to 2mm
2
Battery changes into by liquid injection hole (11) fluid injection after-opening, changes into to finish the thick aluminium foil of back use 0.01-0.3mm by laser welded seal liquid injection hole (11).
The present invention is by using the multipole ear and the ultra-sonic welded technology of integral type, makes the contact resistance of battery less than 7m Ω, and mass transfer resistance is less than 1.5m Ω, and the total internal resistance of battery makes it can carry out discharging and recharging of big multiplying power less than 8.5m Ω, and stable performance, life-span are long.
Specifically describe three different examples of power lithium-ion battery of the present invention below.
Example 1:
This example be overall dimension (disregarding pole) for 70mm * 34mm * 70mm (length * wide * height) but the pure LiMn2O4 electrokinetic cell of 10Ah that discharges and recharges of 4C, its pole cross section is minimum, and to locate diameter be 3-6mm.
At first, use lithium manganate material, carbon black, binding agent, solvent to make anode sizing agent by ultrasonic mixing method, wherein carbon black accounts for the 1-6% of total solid quality, and binding agent accounts for the 2-6% of total solid quality, and all the other are lithium manganate material; Use native graphite, carbon black, binding agent, solvent to make cathode size by ultrasonic mixing method, wherein carbon black accounts for the 0.5-6% of total solid quality, and binding agent accounts for the 2-6% of total solid quality, and all the other are native graphite.Carry out the gap coating according to positive electrode active materials than the mass ratio that negative active material equals 2-3.5, the width of coating is 500mm, and the segment length is 50-65mm (1 times of pole piece is wide), and the gap is 20-60mm.
With coated pole piece oven dry, cut, as shown in Figure 5, make each pole piece comprise 1 coating section and a gap section, punch out 2 lugs that 5-15mm is wide in the gap of positive plate section according to calculating, punch out 2 lugs that 5-15mm is wide according to calculating in the gap of negative plate section.
The positive/negative plate that obtains is reeled according to common mode, obtain monomer electricity core (1), 8-12 monomer electricity core (1) is overlapping, twine with the termination adhesive tape, all positive pole ears (3) are ultrasonically welded within on the Positive Poles (7), all negative lug (5) are ultrasonically welded within on the negative pole pole (8), and the welding pattern area is 2mm
2Subsequently all monomers electricity cores are packed in the battery container, battery cover and battery container is welded together, with battery oven dry fluid injection 35-55mL also, use the thick aluminium foil of 0.3mm to fetch sealing liquid injection hole (11), thereby make aluminium foil be used as safety valve (12) by Laser Welding.
By the test of loop test instrument, this example battery is that 10.5Ah, 1C (10A) discharge capacity is that 10Ah, 4C (40A) discharge capacity is greater than 9Ah (charging ended when all constant voltage charge 1h or electric current reduced to 100mA) in the interval 0.2C of discharging and recharging of 3V-4.2V (2A) discharge capacity.The above capacity of 3.6V surpassed 91% when 1C discharged first, and energy density surpasses 110Wh/kg; When using common electrolyte, the present embodiment battery is-20 ℃, the discharging and recharging in the interval of 3V-4.2V, and 1C is after discharge capacity keeps the circulation of 70%, 1000 week first, and discharge capacity still can keep more than 50%.When using common electrolyte, under 25 ℃ of room temperatures, this example battery 3V-4.2V discharge and recharge the interval, the battery surface maximum temperature was less than 45 ℃ when 4C discharged and recharged, continuous 200 all cyclic discharge capacities decay are less than 40%.
By the ac impedance spectroscopy test, this example battery is under the situation of 60% charging, and contact resistance is less than 7m Ω, and mass transfer resistance is less than 1.5m Ω, and total internal resistance is less than 8.5m Ω.
Safety tests such as this example battery has passed through short circuit, acupuncture, overcharges, falls, thermal shock.
Example 2
Concrete operations no longer are repeated in this description identical part with example 1 for simplicity at this, and difference is: the lug number that punches out on each positive/negative plate is 4, and the ultra-sonic welded pattern area of lug and pole is 3mm
2The multiplying power discharging property of the 4C of test shows example 2 and the cycle performance of 1C and internal resistance situation and example 1 do not have notable difference.
Example 3
This example be overall dimension (disregarding pole) for 70mm * 34mm * 70mm (length * wide * height) but the pure LiMn2O4 electrokinetic cell of 8Ah that discharges and recharges of 15C, minimum place, the stainless steel Positive Poles bolt cross section of this battery diameter is 6-10mm, and minimum place, brass negative pole pole bolt cross section diameter is 4-8mm.
At first, use lithium manganate material, carbon black, binding agent, solvent to make anode sizing agent by ultrasonic mixing method, wherein carbon black accounts for the 1-6% of total solid quality, and binding agent accounts for the 2-6% of total solid quality, and all the other are lithium manganate material; Use native graphite, carbon black, binding agent, solvent to make cathode size by ultrasonic mixing method, wherein carbon black accounts for the 0.5-6% of total solid quality, and binding agent accounts for the 2-6% of total solid quality, and all the other are native graphite.Carry out the gap coating according to positive electrode active materials than the mass ratio that negative active material equals 2-3.5, the width of coating is 500mm, and the segment length is 50-65mm (1 times of pole piece is wide), and the gap is 20-60mm, and coating thickness is than the little 10%-20% of example 1.
With coated whole volume anode pole piece oven dry, the mode of cutting is with example 1, and difference is: punch out 8 lugs that 5-15mm is wide in the gap section according to calculating.The manufacturing and the positive plate of negative plate are basic identical, do not give unnecessary details at this.
The positive plate and the negative plate that obtain are reeled according to common mode, obtain monomer electricity core (1), 11-15 monomer electricity core (1) is overlapping, twine with the termination adhesive tape, all positive pole ears (3) are ultrasonically welded within on the Positive Poles (7), all negative lug (5) are ultrasonically welded within on the negative pole pole (8), and the welding pattern area is 9mm
2, the battery container of packing into, battery container and battery cover are welded, dry battery and fluid injection 35-55mL, use the thick aluminium foil of 0.3mm to fetch sealing liquid injection hole (11), thereby make aluminium foil be used as safety valve by Laser Welding.
By the test of loop test instrument, this example battery the interval 0.2C of discharging and recharging of 3V-4.2V (1.6A) capacity be 8.4Ah, 1C (8A) capacity greater than 8Ah, 15C (120A) capacity is greater than 6.4Ah.
By the ac impedance spectroscopy test, this example battery is under the situation of 60% charging, and contact resistance is less than 6m Ω, and mass transfer resistance is less than 1m Ω, and total internal resistance is less than 7m Ω.
Safety tests such as this example battery has passed through short circuit, acupuncture, overcharges, falls, thermal shock.
Above-mentioned example is to explanation of the present invention, is not intended to implementation of the present invention and details only are defined as these examples, and any structure after simple equivalence, modification, replacement or combination on the basis of the present invention all belongs to protection scope of the present invention.
Claims (7)
1. powerful lithium-ion-power cell, described battery comprises Positive Poles (7), negative pole pole (8), polytetrafluoroethylene gasket (9), safety valve (12), battery cover (13), battery container (14) and a plurality of monomer electricity core (1) that is connected in parallel, described monomer electricity core (1) comprises positive plate (2), positive pole ear (3), negative plate (4), negative lug (5), it is characterized in that: positive pole ear (3) be and positive plate (2) one and be die-cut obtaining on positive plate (2) collector aluminium foil, negative lug (5) be and negative plate (4) one and be die-cut obtaining on negative plate (4) copper foil of affluxion body, each positive plate (2) and negative plate (4) all have the lug of the described corresponding integral type of 2-8 bar, use barrier film (6) to separate between positive plate and the negative plate.
2. high-power lithium ion electrokinetic cell as claimed in claim 1, it is characterized in that: positive plate (2), barrier film (6) and negative plate (4) are reeled and are formed monomer electricity core (1), along seeing perpendicular to the direction of described barrier film, all positive pole ears (3) are overlapping, and all negative lug (5) are overlapping.
3. high-power lithium ion electrokinetic cell as claimed in claim 1 is characterized in that: the positive pole ear (3) of all monomer electricity cores (1) directly is welded on the Positive Poles (7) by ultrasonic bonding, and bonding area is more than or equal to 2mm
2, the negative lug (5) of all monomer electricity cores (1) directly is welded on the negative pole pole (8) by ultrasonic bonding, and bonding area is more than or equal to 2mm
2
4. high-power lithium ion electrokinetic cell as claimed in claim 3 is characterized in that: post lug adhesive tape (10) respectively on outermost positive pole ear (3) and the negative lug (5).
5. high-power lithium ion electrokinetic cell as claimed in claim 2 is characterized in that: by riveted way and use vinyon packing ring (9), realize the sealing between Positive Poles (7) and negative pole pole (8) and the described battery cover (13).
6. high-power lithium ion electrokinetic cell as claimed in claim 2, it is characterized in that: Positive Poles (7) is used stainless steel bolt, negative pole pole (8) uses diameter to be slightly less than the brass bolt of Positive Poles (7), and use polytetrafluoroethylene gasket (9) is implemented in the sealing between described Positive Poles (7) and described negative pole pole (8) and the described battery container.
7. high-power lithium ion electrokinetic cell as claimed in claim 1, it is characterized in that: have liquid injection hole (11) on described battery container, the thick aluminium foil of 0.3mm forms described safety valve (12) upward to use laser welding directly to weld upward at described liquid injection hole (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNA2008101126336A CN101286577A (en) | 2008-05-23 | 2008-05-23 | Lithium ion power cell with high power |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008101126336A CN101286577A (en) | 2008-05-23 | 2008-05-23 | Lithium ion power cell with high power |
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