CN1266798C - Method for preparing lithium polymer secordary battery - Google Patents
Method for preparing lithium polymer secordary battery Download PDFInfo
- Publication number
- CN1266798C CN1266798C CNB031016928A CN03101692A CN1266798C CN 1266798 C CN1266798 C CN 1266798C CN B031016928 A CNB031016928 A CN B031016928A CN 03101692 A CN03101692 A CN 03101692A CN 1266798 C CN1266798 C CN 1266798C
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- China
- Prior art keywords
- plate
- barrier film
- battery
- positive plate
- membrane
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 229920000642 polymer Polymers 0.000 title claims abstract description 29
- 229910052744 lithium Inorganic materials 0.000 title abstract description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title abstract description 4
- 230000004888 barrier function Effects 0.000 claims description 32
- 239000012528 membrane Substances 0.000 abstract 7
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 210000004027 cell Anatomy 0.000 description 20
- 238000004804 winding Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910012820 LiCoO Inorganic materials 0.000 description 1
- 229910013872 LiPF Inorganic materials 0.000 description 1
- 101150058243 Lipf gene Proteins 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 239000006183 anode active material Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000006182 cathode active material Substances 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 150000002641 lithium Chemical class 0.000 description 1
- 230000036244 malformation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000007500 overflow downdraw method Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000867 polyelectrolyte Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The present invention discloses a method for preparing a lithium polymer secondary battery. The secondary battery comprises a plurality of elementary cells, wherein each elementary cell comprises an anodic, a cathode electrode and a membrane, the elementary cell can make the gap between each electrode and the membrane be the smallest, a stress is evenly distributed on the whole surface of each electrode, and thus, the service life of a rechargeable cell is prolonged. The method comprises the following steps: a plurality of anode plates with needed sizes, a plurality of negative plates with needed sizes and the membrane with desirable elementary cell sizes are prepared; the membrane is used to intertwine one anode plate, and the membrane is used for intertwining one negative plate so that the negative plate and the anode plate are in an overlapping state to form the elementary cell; when the elementary cell is formed because of rotating, the left anode plates and negative plates are stacked on both sides of the formed elementary cell, the membrane is simultaneously used for intertwining the left anode plates and negative plates so as to alternately range to a state that the membrane is tensed by desirable tension.
Description
Technical field
The present invention relates to the preparation method of lighium polymer secondary battery, more particularly, the present invention relates to a kind of barrier film that in assembling process, under the situation of the initial element cell that forms of rotation, utilizes and twine anode and minus plate, make it be in barrier film by the preparation method of the lighium polymer secondary battery of desirable tension-stretched state.
Background technology
Recently, portable set such as notebook computer and mobile phone use widely.Being extensive use of of this portable set causes the needs of high power capacity and high performance rechargeable secondary cell are increased hugely.Chargeable lithium rechargeable battery has been proposed, it comprises by can occlusion and discharge the positive pole that the carbonaceous material of lithium ion is made as active material, by can carrying out the negative electrode that the lithium based mixed oxide of the charge and discharge of lithium ion is made according to malformation, and as vectorial nonaqueous electrolytic solution of lithium ion.This lithium rechargeable battery is widely used.But this ion battery has the problem relevant with stability, because it has the reactivity of height to moisture, and uses excessive heat-labile electrolyte.And it need use canister as battery packages.Just because of this, so energy density is low, and the shape of battery is restricted.
In order to eliminate these problems or shortcoming, proposed to use the lighium polymer secondary battery of polyelectrolyte.This lighium polymer secondary battery has the electrolyte leakage that has reduced, and allows freely to design the shape of battery simultaneously.In addition, also have miniaturization, advantage that in light weight and structure is thin, and excellent stability.The example of this lighium polymer secondary battery is seen US 6,468,693 and other patent.
Fig. 1 illustrates the method that adopts winding process to prepare lighium polymer secondary battery.US 6,468, also adopted this method in 693.Lighium polymer secondary battery according to this patent is jellyroll type (jelly rolletype).That is to say, in the structure of this lighium polymer secondary battery, " jellyroll " is inserted in the container, then cover lid and seal by the laser fusion method.The negative electrode of this lighium polymer secondary battery and anode are by coated polymeric adhesive, conductive powder and active electrode material prepare on sheet copper and thin aluminum sheet respectively.In order to enclose electrode tap, negative electrode and anode have uncoated part.The uncoated part of negative electrode and anode is respectively the electrode tap of being made by nickel and aluminum.Two electrodes are connected on the outside terminal of battery by electrode tap respectively.When " jellyroll " being inserted in the container, with one attached on the bottom or side of the electrode tap on the uncoated part of electrode attached to container, and with another tap attached on the top cover.This assemble method and structure provide some advantage.That is to say that anode and negative electrode are in contact with one another equably by be applied to the tension force on the barrier film in winding process, are supported on the chamber wall by physical action simultaneously.Therefore, when battery discharges and recharges according to electrochemical reaction, use the whole surface of electrode equably.Like this, battery has excellent performance basically, even also has high-performance when long charge and discharge cycles.The element cell wall of being made by the metal material with high mechanical properties has provided another advantage.That is, " jellyroll " is filled in the inside of container with strong squeezed state because of the physical pressure that exists between itself and the chamber wall.The distortion minimum of container on thickness direction that the internal modification power that produces because of " jellyroll " is caused.Therefore, can improve the energy density of the battery unit volume that finally makes.In addition, the material that can prevent from the container to be comprised leaks, and prevents that foreign matter from infiltrating inside battery.
Yet, adopt the lighium polymer secondary battery of winding method preparation to have crooked shape, do not meet perfect flat shape, but meet the ellipse of distortion.Just because of this, " jellyroll " can not be formed with gap and be assemblied in the battery.Therefore, stress concentrated at the stress at element cell edge and the element cell centre there are differences between concentrating.As a result, the problem that exists battery life to reduce.
On the other hand, US 4,048, and 397 disclose a kind of a plurality of electrode stack is stacked in zigzag stacking method in certain zone.Battery according to this method preparation has the stacked structure on plane, so do not cause any stress difference.But,, in the process of piling up, form the gap between each battery lead plate and the barrier film inevitably, as shown in Figure 2 according to this method.Because this gap that is formed between each battery lead plate and the barrier film, battery may expand in its edge after discharging and recharging for a long time, thus the life-span of reducing battery.
Summary of the invention
Therefore, the present invention finishes under the situation of considering above-mentioned winding method and the existing problem of zigzag stacking method, a kind of method for preparing lighium polymer secondary battery that provides is provided, this method can make each electrode become minimum with gap between the barrier film, and make stress be distributed in the whole surface of each electrode equably, prolong the life-span of rechargeable battery thus.
According to the present invention, this purpose can realize by a kind of method for preparing lighium polymer secondary battery is provided, this secondary cell comprises a plurality of element cells, each element cell comprises positive plate, minus plate and is used for making the barrier film of mutually insulated between the battery lead plate, this method comprises the steps: to prepare a plurality of positive plates with required size, a plurality of minus plates, and list with the size of catering to the need with required size
The barrier film of unit's battery; Twine a positive plate with barrier film; Twine a minus plate with barrier film, and make itself and positive plate be in overlap condition, form an element cell thus; And under the situation of the formed element cell of rotation, pile up remaining positive plate and minus plate in the both sides of formed element cell, and twine them with barrier film simultaneously, make them alternately be arranged in wherein barrier film by desirable tension-stretched state.
Description of drawings
Read after the following detailed description, and in conjunction with the accompanying drawings, above-mentioned purpose of the present invention and further feature and advantage will be more apparent, in the accompanying drawings:
Fig. 1 is that explanation adopts the winding legal system to be equipped with the schematic diagram of the method for lighium polymer secondary battery;
Fig. 2 is that explanation adopts zigzag to pile up the schematic diagram that legal system is equipped with the method for lighium polymer secondary battery;
Fig. 3 A～3C is the explanation schematic diagram for preparing the method for lighium polymer secondary battery of the present invention; And
Fig. 4 is the schematic diagram of explanation lighium polymer secondary battery prepared in accordance with the present invention;
Fig. 5 is the evaluation result in explanation lighium polymer secondary battery life-span prepared in accordance with the present invention.
Embodiment
With reference to Fig. 3 A～3C, the method for preparing lighium polymer secondary battery of the present invention is described.Shown in Fig. 3 A～3C, lighium polymer secondary battery comprises a plurality of element cells, each element cell comprises the positive plate 2 that has been coated with dry anode active material, be coated with the minus plate 3 of dried cathode active material, and the barrier film 1 that positive plate 2 and minus plate 3 is isolated by being used for of making of polyolefin.The method according to this invention, first element cell are to form like this: twine a positive plate 2 with barrier film 1, twine a minus plate 3 with barrier film 1 then, make that minus plate 3 and positive plate 2 are overlapping, as shown in Figure 3A.Thereafter, the element cell of lighium polymer secondary battery is stacked on the both sides of first element cell, the barrier film 1 in order to suitable tension force stretching twines simultaneously.In rotation first module battery, implement this method.The best mode of this method is shown among Fig. 3 B and the 3C.The complete structure of this lighium polymer secondary battery is shown among Fig. 4.
The tension force of barrier film 1 is preferably 0.3～5kgf/cm
2When barrier film tension force less than 0.3kgf/cm
2Or greater than 5kgf/cm
2The time, the problem relevant with machinability takes place.
Now illustrate in greater detail the present invention with reference to embodiment and Comparative Examples.
The lighium polymer secondary battery that is used for present embodiment has the standard that is equivalent to the 1.3Ah level.The positive plate 2 of each element cell in this lighium polymer secondary battery is by be coated with into the LiCoO of film like on aluminium foil
2And preparation.Minus plate 3 is to prepare by the graphite that is coated with into film like on Copper Foil.The longitudinal size of positive plate 2 is 46mm, and lateral dimension is 50.4mm, and the longitudinal size of minus plate 3 is 46.6mm, and lateral dimension is 52mm, and the width of barrier film 1 is 53.5mm.Positive plate 2 and minus plate 3 prepare by pressing.At first barrier film 1 is wrapped on the positive plate 2, as shown in Figure 3A., with barrier film 1 twine a minus plate 3, make it be in the state overlapping with positive plate 2 thereafter.The winding of barrier film 1 is to carry out under the situation that it is applied certain force of strain.So just constituted an element cell.Remaining element cell can so form: under the situation of this element cell of rotation, with the both sides that the positive plate 2 and the minus plate 3 of remainder is stacked on this element cell, twine them with barrier film 1 simultaneously, make them alternately be arranged in barrier film 1 by 1.5kgf/cm
2The state that stretches of even tension., the assembly parts of gained be inserted in aluminium box, stay next surface then, all sealings of remaining surface thereafter.By unencapsulated surface, in assemblage, add the LiPF of 4.7g 1M
6/ EC: PC: EMC (30: 10: 60).Then, with assemblage sealing fully under vacuum.Finally, electrode is dipped in the electrolyte fully.
Comparative Examples 1
Carry out the step identical with embodiment 1, just the assembling of positive plate and minus plate is to be undertaken by winding method shown in Figure 1.
Comparative Examples 2
Carry out the step identical with embodiment 1, just the assembling of positive plate and minus plate is to be undertaken by the zigzag method of piling up shown in Figure 2.
The battery charge that will prepare in embodiment 1 and Comparative Examples 1 and 2 is carried out the evaluation to battery life then.Evaluation result is shown among Fig. 5.
The evaluation of＜charging/discharging thereof and battery life 〉
For for each battery of preparation in embodiment 1 and Comparative Examples 1 and 2, the primary charging operation is carried out in two steps, promptly at first charges to 3.15V with 0.2C, charges to 4.2V with 0.2C then.Wait to experience after the stabilization step, with each battery with 1C constant voltage and constant current charge to 4.2V.Each battery with 1C be discharged to 3.0V thereafter.At normal temperatures, utilize the life-span that discharges and recharges experimental rig (TOSCAT-3000U) evaluation battery.
From embodiment 1 and Comparative Examples 1 and 2 as can be seen, in lighium polymer secondary battery of the present invention, stress is applied to the whole surface of battery equably.In this lighium polymer secondary battery, the gap between each electrode and the barrier film has also minimized.Therefore, has the high power capacity conservation rate that discharges and recharges operation for a long time.Thereby the life characteristic of battery is improved.
Claims (1)
1. method for preparing lighium polymer secondary battery, this secondary cell comprises a plurality of element cells, each element cell comprises positive plate, minus plate and is used to make the barrier film of positive plate and minus plate mutually insulated that this method comprises the steps:
Prepare a plurality of positive plates with required size;
Prepare a plurality of minus plates with required size;
Twine in described a plurality of positive plate one with barrier film, make barrier film under tension force, cover the apparent surface of positive plate;
With this positive plate of imbrication in described a plurality of minus plates, make between the surface of barrier film in the apparent surface of the surface of minus plate and positive plate;
At 0.3～5kgf/cm
2Tension force twine down barrier film, to cover the apparent surface of a plurality of element cells;
Under the situation of the formed element cell of rotation, alternately pile up remaining positive plate and minus plate in the both sides of formed element cell; And
In this stacking procedure, at 0.3～5kgf/cm
2Tension force twine down barrier film, to cover and around remaining positive plate and remaining minus plate, make barrier film between adjacent positive plate and minus plate between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031016928A CN1266798C (en) | 2003-01-14 | 2003-01-14 | Method for preparing lithium polymer secordary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031016928A CN1266798C (en) | 2003-01-14 | 2003-01-14 | Method for preparing lithium polymer secordary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1518152A CN1518152A (en) | 2004-08-04 |
| CN1266798C true CN1266798C (en) | 2006-07-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031016928A Expired - Lifetime CN1266798C (en) | 2003-01-14 | 2003-01-14 | Method for preparing lithium polymer secordary battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1266798C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931106A (en) * | 2009-06-22 | 2010-12-29 | 安纳泰克国际股份有限公司 | Manufacturing method of stacked electrodes by winding type electrode stacking and stacked electrode thereby |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1321477C (en) * | 2003-10-28 | 2007-06-13 | 比亚迪股份有限公司 | Lithium ion secondary cell |
| KR100859996B1 (en) * | 2006-05-15 | 2008-09-25 | 주식회사 엘지화학 | Double Winding-typed Electrode Assembly |
-
2003
- 2003-01-14 CN CNB031016928A patent/CN1266798C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931106A (en) * | 2009-06-22 | 2010-12-29 | 安纳泰克国际股份有限公司 | Manufacturing method of stacked electrodes by winding type electrode stacking and stacked electrode thereby |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1518152A (en) | 2004-08-04 |
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