CN2722447Y - Lithium ion power battery - Google Patents

Lithium ion power battery Download PDF

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Publication number
CN2722447Y
CN2722447Y CN200420066336XU CN200420066336U CN2722447Y CN 2722447 Y CN2722447 Y CN 2722447Y CN 200420066336X U CN200420066336X U CN 200420066336XU CN 200420066336 U CN200420066336 U CN 200420066336U CN 2722447 Y CN2722447 Y CN 2722447Y
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China
Prior art keywords
lithium
positive
ion
energy unit
shell
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Expired - Fee Related
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CN200420066336XU
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Chinese (zh)
Inventor
刘立君
骆宏钧
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Beijing Science Technology Management College
BEIJING GELIN POWER SOURCE TECHNOLOGY Co Ltd
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Beijing Science Technology Management College
BEIJING GELIN POWER SOURCE TECHNOLOGY Co Ltd
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Priority to CN200420066336XU priority Critical patent/CN2722447Y/en
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Publication of CN2722447Y publication Critical patent/CN2722447Y/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

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Abstract

The utility model discloses a lithium ion power battery, which comprises a casing provided with a positive electrode pole and a negative electrode pole and a plurality of groups of energy units, wherein the energy unit is arranged inside the casing and is arrayed along the long direction of the maximum side surface of the casing; the casing presents a cuboid structure; the energy units are vertically arranged inside the casing; the narrow surface of the side surface of the energy unit is in parallel with the broad surface of the side surface of the casing, and the broad surface of the side surface of the energy unit is in parallel with the narrow surface of the side surface of the casing; the energy unit is a roll core formed by that a positive electrode piece and a negative electrode piece are wound into a plurality of loops at intervals through a membrane. Compared with the prior art, the utility model has the characteristics of simple structure, simple fabrication process, high energy density, low attrition rate, small deformation, favorable safety performance, etc.

Description

Lithium-ion-power cell
Technical field
The utility model relates to a kind of lithium rechargeable battery, and the lithium-ion-power cell of the energy is provided for high-energy equipments such as electric bicycle, battery-operated motor cycle and electric automobiles in more detail.
Technical background
Lithium ion battery is that Li embedding compound is the rechargeable battery of both positive and negative polarity, the anodal lithium compound LiCoO that adopts 2, LiNiO 2, LiMn 2O 4Or LiFePO 4, negative pole adopts lithium-carbon intercalation compound LiXC 6Electrolyte is for being dissolved with LiPF 6, LiASF 6Organic solution Deng lithium salts.In charge and discharge process, lithium ion Li +Between two electrodes, come and go embedding and take off embedding, be called " rocking chair battery " (Rocking Chair Batteries is abbreviated as RCB) visually.Make battery from people's utility model lithium metal material, constituted since the lithium ion battery of high voltage and high specific energy, the world today has produced the lithium ion battery of two major types, is liquid the earliest, develops again after the nineties solid-state polymer battery.The anode of lithium ion battery and negative electrode are made by carbonaceous material and metal oxide respectively, have the layer structure that promotes lithium ion heavily to cover migration." rocking chair " effect makes lithium ion battery that long storage life and long cycle life be arranged.The lithium-ion-power cell of this paper narration is on the basis of liquid and solid polymer lithium ion battery, research and development a kind of big capacity, powerful lithium-ion-power cell of colloidal state of new construction.This utility model has been filled up the blank in big capacity high power battery field in the world.
Along with electric Driving technique extensively and profoundly in people life, driven by power is about to become the major impetus energy that the human lives uses.Because electric energy is environmentally friendly, and its source has relative immutability, so perhaps the driven by power technology can continue millennium.And technology such as steam engine, internal combustion engine, turbine all are the technology with the combustion mode work done, it is short interlude in the human social development process, though their generation has promoted social development, also injured the earth environment that people depend on for existence dearly.Be accompanied by the crisis of worldwide fuel reserves, and more and more serious environmental is polluted, development is that the vehicles of the major impetus energy are fast-developing with the storage battery.But traditional storage battery does not solve the deadly defect of itself as a kind of high-power, jumbo electrical source of power, and people find not eliminate the two large problems that existing battery exists at all in thousands of times test:
(1) specific energy low (disposable charging does not reach desirable continual mileage)
(2) specific power little (it is low to quicken climbing capacity, is difficult to the state of tending to balance when heavy-current discharge)
The generation of lithium-ion-power cell has represented new hope to the driving arrangement that uses high-power macro-energy.Analysis-by-synthesis and actual verification according to the performance (comprising: charge-discharge characteristic, temperature characterisitic, cycle life, self discharge and fail safe) of lithium-ion-power cell, existing consistent conclusion is thought: the application prospect of lithium-ion-power cell wide, the broadness of the scope of application can't be estimated.
Existing lithium-ion-power cell generally adopts takeup type,, be wound into battery pack as adopting 1 group of positive and negative plate, but it is generally acknowledged that prior art can not make battery roll core infinitely enlarge (as: the garden post battery thermal safety greater than 2Ah will sharply descend).Progressive is will organize coiled battery to be combined into battery pack more, just introduced a kind of with the superimposed method that is assembled into battery pack of a plurality of cells as Chinese patent 02285475.4, wherein cell is arranged along the leptoprosopy of shell, their wide is mutual superimposed, the major defect that this battery exists is: 1. because existing inside battery stress is to avoid, this patent has been avoided the method that is in the past retrained internal stress by shell, and with inner elastomeric bulk absorption internal stress, its consequence is that inside battery interlayer spacing changes, and this will cause the stable performance of battery performance; 2. this inside battery cell arragement direction is unfavorable for the constraint to the pole piece interfloor distance, and both the restraining force of wide vertical direction of battery case side was the most weak; 3. one of original intention of this type of battery structure is not wish that inner cell capacity is excessive, and according to the described cell orientation of this utility model, can not make the battery (as: greater than 100Ah) of larger capacity in the practical application.
In addition, also there is employing stacked, introduced a kind of laminated Li-ion electrokinetic cell as Chinese patent 00228495.2.Yet they are all excessive owing to the pole piece area, and defective such as very easily in the assembling process of battery complexity and charge and discharge process cause that heat radiation is smooth, distortion, dry linting, pole piece degree of tightness are inconsistent causes potential safety hazard.
The utility model content
The purpose of this utility model is: at the deficiencies in the prior art, provide a kind of simple in structure, function admirable, the easy battery structure of production assembly technology.
In order to solve the problems of the technologies described above, technical solution adopted in the utility model is: a kind of lithium-ion-power cell, comprise the shell that has positive and negative pole, and also comprise many group energy units, described energy unit setting and is arranged along the length direction of the maximum side surface of shell in the enclosure.
Described shell can be rectangular structure, and described energy unit is vertical to be provided with in the enclosure, and the leptoprosopy of the side surface of energy unit and the side surface of shell wide is parallel, and wide the leptoprosopy with the side surface of shell of the side surface of energy unit is parallel.
Described energy unit can for by positive and negative plate by the barrier film volume core that multi-turn forms of reeling at interval.
Can conduct electricity respectively on the positive and negative plate of described volume core and be connected with positive and negative lug.
The positive and negative lug of described all energy units can be connected to the positive and negative pole of shell respectively.
Described positive and negative lug can connect positive and negative pole by aluminum band or nickel system band respectively.
Described energy unit can have 2~100 groups.
The coiling number of turns of described volume core can be 2~100 circles.
In technique scheme, the utility model adopts the independent energy unit of many groups to be combined into the battery pack of battery, and with the length direction arrangement of all energy units along the maximum side of shell, compared with prior art, has following advantage:
1, the strong characteristics of battery container minor face non-deformability have been made full use of, not only make pole piece main along the volume mandrel to expansion obtained stronger restraining force, and outer casing thickness distortion is transformed in the outer cover length distortion cleverly, thereby make to discharge and recharge the deformation that causes and obtained effective control, the cell thickness distortion that the user is concerned about has most obtained guarantee;
2, owing to energy unit is arranged along the length direction of the maximum side of shell, thereby make pole piece, increased area of dissipation, be beneficial to the diffusion of heat, significantly improved thermal safety mainly to the maximum side conduction of shell heat;
3, owing to the inner combination in parallel of employing multireel core energy unit, thereby have the low characteristics of short circuit ratio, can effectively avoid the large tracts of land short circuit, improved the breach security of battery greatly;
4, owing to being, all energy units are connected in parallel, and their shared electrolyte, thereby the internal resistance and the internal resistance that have reduced battery change.For the common batteries that only adopts 1 group of pole piece coiling Cheng Dajuan core, the utility model has fully guaranteed the high-rate battery discharge performance, after tested, under the situation of the heavy-current discharge of 1C multiplying power, discharge capacity reaches more than 75% of 0.1C multiplying power discharging capacity;
5, owing to adopt the multireel core combination of winding method, be convenient to detect and control micro-short circuit phenomenon, make battery improve charged maintenance performance, place after one month, its energy conservation rate is still more than 89%;
6, owing to adopt a plurality of independently energy units, be equivalent to traditional lamination mode, the utility model is convenient to the short-circuit detecting and the maintenance of production process, obviously reduces and produces scrappage, and production has important and practical meanings for macrocell;
7, easy to make, can make full use of the preparation equipment that has electric core now;
Description of drawings
Accompanying drawing 1 is the perspective view of the utility model lithium-ion-power cell;
Accompanying drawing 2 is the longitudinal profile structural representation of an energy unit of the utility model lithium-ion-power cell.
Embodiment
Below in conjunction with Figure of description and specific embodiment the utility model is described in further detail.
With reference to the accompanying drawings 1, the utility model lithium-ion-power cell is made of shell 1, some groups of energy units 3.
Described shell 1 is rectangular structure, and its end face is provided with positive and negative pole 2,5 and liquid injection hole 6, and wide 10 of its side surface is an one maximum side surface, is leptoprosopy 11 with wide 10 adjacent side surface.
Described energy unit 3 can have 2~100 groups, the difference of the difference decision battery capacity of its group number.They all vertically are arranged in the shell 1, and are arranged in a row along the length direction of the maximum side surface 10 of shell.Wide 10 equidistant parallel of the side surface of the leptoprosopy of the side surface of described all energy units 3 and shell 1, wide the leptoprosopy 11 with the side surface of shell 1 of its side surface is parallel.This energy unit is arranged the structure that is provided with along maximum side surface length direction will help to make high-capacity lithium battery.
With reference to the accompanying drawings 2, described energy unit 3 for by positive and negative plate 32,33 by the barrier film 34 volume core that multi-turn (can be 2~100 circles, its number of turns be determined according to integral battery door capacity, shell sizes and cell capacity complex optimum) forms of reeling at interval.And conduct electricity respectively on the positive and negative plate 32,33 and be connected with positive and negative lug 30,31.Described positive and negative lug 30,31 is connected to the positive and negative pole 2,5 of shell 1 respectively by aluminum band or nickel system band 4, be parallel connection between each energy unit thereby make, and reaches the purpose that improves the electric current handling capacity and reduce the internal resistance of cell.
The course of processing of the present utility model is as follows:
1, positive plate 32 adopts active material LiMO 2(M=Co, Mn, Ni or their composite oxides), LiMPO 4(M=Fe, Co, Mn, Ni, V etc. or their composite oxides).Positive electrode active materials and acetylene black, Kynoar, electrically conductive graphite etc. be dissolved in proportion be mixed and made into slurries in N-methyl pyrrolidone or the dimethylacetylamide, slurries are coated on the two sides of aluminium foil (or aluminium net), after 80~150 ℃ of following dryings, backing, cutting obtain anode pole piece;
2, negative plate 33 adopts MCMB, graphite or other electronegative potential intercalation materials of li ions, it is mixed the back slurries of making soluble in water by a certain percentage with acetylene black, CMC, butadiene-styrene rubber etc., slurries are coated on equably the two sides of Copper Foil (or copper mesh), after 80~150 ℃ of following dryings, backing, cutting obtain negative plate;
3, with polypropylene or polyethylene film 34 positive and negative plate is separated and align after be rolled into core and form independent energy unit 3, pack the volume core that glues adhesive tape into metal or plastic battery shell along long limit;
4, the battery that a plurality of energy units will be housed welds, sinks to the bottom, welds, obtains big capacity, highly secure lithium ion dynamic battery after the baking, fluid injection, encapsulation through lug.
According to above-mentioned manufacture method, can make a 100Ah lithium-ion-power cell, its specification is as follows:
Battery profile: 550 * 120 * 160 (length * wide * high units: mm)
Energy unit size: 50 * 100 * 150 (length * wide * high units: mm)
Volume core number: 10
Positive plate size: 1600 * 150 (units: mm)
Negative plate size: 1620 * 154 (units: mm)
The positive and negative lug of single volume core is coupled together the back by aluminium strip and copper strips respectively to be connected with battery electrode column with the fixing back of rivet, detect performance, with laser housing and cover plate are welded, promptly get 100Ah high-power lithium ion electrokinetic cell after passing through and toasted the back fluid injection in 5-20 hour, sealing, change into.
The employing method of testing is: first constant current charge changes constant voltage charge about 100 minutes again to 4.2V, and then constant-current discharge to cut-ff voltage is 2.75V.The contrast test object that adopts is: stack type lithium ion battery, multireel core (the volume core is arranged along the leptoprosopy of shell) lithium ion battery and lithium-ion-power cell of the present utility model.The test parameter that adopts is: gravimetric specific energy parameter, cycle performance (being cycle charging or the efficiency for charge-discharge value after 300 times of discharging), cell thickness rate of change (promptly 100 batteries are recycling the deformation rate value of battery afterwards).The performance comparison that can record three kinds of lithium ion batteries is listed as follows:
Stack type lithium ion battery Multireel core lithium ion battery The utility model
Gravimetric specific energy (Wh/kg) 100 120 150
Cycle performance (300 times) 79% 70% 90%
Cell thickness (100) ±7% ±10% ±1%
From above-mentioned test performance comparing result as can be seen, the utility model lithium ion battery of the prior art relatively, obviously more durable in use, the proportion of goods damageds are low, and performance is better.

Claims (8)

1, a kind of lithium-ion-power cell comprises the shell that has positive and negative pole, it is characterized in that: also comprise many group energy units, described energy unit setting and is arranged along the length direction of the maximum side surface of shell in the enclosure.
2, lithium-ion-power cell according to claim 1, it is characterized in that: described shell is rectangular structure, described energy unit is vertical to be provided with in the enclosure, and wide of the side surface of the leptoprosopy of the side surface of energy unit and shell is parallel, and wide the leptoprosopy with the side surface of shell of the side surface of energy unit is parallel.
3, lithium-ion-power cell as claimed in claim 1 or 2 is characterized in that: described energy unit for by positive and negative plate by the barrier film volume core that multi-turn forms of reeling at interval.
4, as lithium-ion-power cell as described in the claim 3, it is characterized in that: be connected with positive and negative lug on the positive and negative plate of described volume core respectively.
5, as lithium-ion-power cell as described in the claim 4, it is characterized in that: the positive and negative lug of described all energy units is connected to the positive and negative pole of shell respectively.
6, as lithium-ion-power cell as described in the claim 5, it is characterized in that: described positive and negative lug connects positive and negative pole by aluminum band or nickel system band respectively.
7, lithium-ion-power cell according to claim 1, it is characterized in that: described energy unit has 2~100 groups.
8, as lithium-ion-power cell as described in the claim 3, it is characterized in that: the coiling number of turns of described volume core is 2~100 circles.
CN200420066336XU 2004-06-30 2004-06-30 Lithium ion power battery Expired - Fee Related CN2722447Y (en)

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Application Number Priority Date Filing Date Title
CN200420066336XU CN2722447Y (en) 2004-06-30 2004-06-30 Lithium ion power battery

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102064349A (en) * 2009-12-31 2011-05-18 杭州万马高能量电池有限公司 Lithium ion storage battery special for starting motorcycle
CN102456862A (en) * 2010-11-01 2012-05-16 三星Sdi株式会社 Secondary battery

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102064349A (en) * 2009-12-31 2011-05-18 杭州万马高能量电池有限公司 Lithium ion storage battery special for starting motorcycle
CN102456862A (en) * 2010-11-01 2012-05-16 三星Sdi株式会社 Secondary battery
CN102456862B (en) * 2010-11-01 2016-06-29 三星Sdi株式会社 Secondary cell
US9543562B2 (en) 2010-11-01 2017-01-10 Samsung Sdi Co., Ltd. Secondary battery

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GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20050831

Termination date: 20110630