CN1767251A - Soft-packaged lithium ion battery manufacturing method - Google Patents
Soft-packaged lithium ion battery manufacturing method Download PDFInfo
- Publication number
- CN1767251A CN1767251A CNA200510020545XA CN200510020545A CN1767251A CN 1767251 A CN1767251 A CN 1767251A CN A200510020545X A CNA200510020545X A CN A200510020545XA CN 200510020545 A CN200510020545 A CN 200510020545A CN 1767251 A CN1767251 A CN 1767251A
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- CN
- China
- Prior art keywords
- lithium ion
- ion battery
- flexible packing
- bonding agent
- packing lithium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims description 21
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000004804 winding Methods 0.000 claims abstract description 6
- 239000007767 bonding agent Substances 0.000 claims description 40
- 238000012856 packing Methods 0.000 claims description 29
- 239000002033 PVDF binder Substances 0.000 claims description 25
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 25
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 22
- 238000002360 preparation method Methods 0.000 claims description 22
- 239000000084 colloidal system Substances 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 3
- 240000008042 Zea mays Species 0.000 abstract 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 abstract 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 abstract 1
- 239000004568 cement Substances 0.000 abstract 1
- 235000005822 corn Nutrition 0.000 abstract 1
- 238000003756 stirring Methods 0.000 description 12
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 239000002985 plastic film Substances 0.000 description 3
- 229920006255 plastic film Polymers 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000012858 packaging process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Classifications
-
- 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
Abstract
The invention discloses a method for making soft package lithium ion, which comprises the step of electric corn winding and the step of using the cement to fix the electric core end.
Description
[technical field]
The present invention relates to materials chemistry field and high-energy battery technology, be specifically related to the manufacture method of flexible packing lithium ion battery.
[background technology]
For a long time, people are pursuing high energy battery, have carried out the exploitation and the improvement of multiple battery for this reason.In battery up to now, lithium secondary battery has the high power capacity that can expect most, now still in positive it is improved.Traditional lithium secondary battery comprises positive pole, negative pole, barrier film, and lamination is reeled successively, electrically contacts for keeping electrolyte and each interlayer, and it is sealed in the canister.But canister is thick and heavily, as nonactive composition, its existence has had a strong impact on the overall performance of battery, not only increased the weight of lithium secondary battery, made miniaturization, lightweight become difficult, and, because the outspoken nature of metal-back, arbitrary shape changes into to impossible.
In view of the situation, lighium polymer secondary battery has been proposed.It is the novel rechargeable battery with very big application prospect of latest development, and its maximum characteristics are to adopt the flexible packing material aluminum plastic film of nonmetal duricrust, have features such as volume is little, in light weight, safety non-pollution.Therefore the apparent size after the flexible packing lithium ion battery electricity core packing and the very big relation that is manufactured with of electric core should make the end of pole piece stay electric core side when making as far as possible.Aborning, must make electric core keep surfacing and homogeneous.Need to vacuumize heat-seal operation in the packaging process of battery, therefore electric core end is fixing very important, otherwise can influence the shape that electric wicking surface coats in packaging process.Traditional way is that the battery battery core end is fixed with hinge, and this electric core can not influence the battery outward appearance if put in the hard shell, but after adopting the flexible packing material aluminum plastic film, on the one hand, can stay the gummed paper vestige on the surface, influences the battery outward appearance.On the other hand, phenomenons such as fold, local accumulation, heat-sealing limit is crooked can appear in battery, also can influence the overall performance of battery when serious.
[summary of the invention]
The object of the present invention is to provide a kind of bonding firmly, can make the battery battery core surfacing after the coating, the manufacture method of the flexible packing lithium ion battery that outward appearance is good.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of manufacture method of flexible packing lithium ion battery, comprise the step of electric core winding and the end fixed step of the electric core in back of reeling, behind coiling, with bonding agent electric core end is fixed in the end fixed step of electric core.
The preferred such composition of described bonding agent: contain N-methyl pyrrolidone (NMP) and polyvinylidene fluoride (PVDF).
Described bonding agent also can preferably be made up of N-methyl pyrrolidone and polyvinylidene fluoride.
The weight percentage of described each composition is preferably: N-methyl pyrrolidone 60%～90%, polyvinylidene fluoride 10%～40%.
The weight percentage of described each composition is more preferably: N-methyl pyrrolidone 75%～90%, polyvinylidene fluoride 10%～25%.
Bonding agent of the present invention is 84% at NMP content, and PVDF content is 16% o'clock best results.
Above-mentioned bonding agent can be made by the method that may further comprise the steps:
(a) N-methyl pyrrolidone and the polyvinylidene fluoride with weighing mixes;
(b) said mixture is vacuumized.
Such method is preferably adopted in mixing in the above-mentioned steps (a), and N-methyl pyrrolidone and polyvinylidene fluoride are at room temperature fully stirred 15～35min, makes it to form a kind of colloid substance.
Above-mentioned mixing time is preferably 20～30min.
The present invention also provides a kind of flexible packing lithium ion battery that uses said method to make.
Adopt technique scheme, in conjunction with the following embodiment that will describe in detail, beneficial technical effects of the present invention is: 1) owing to use bonding agent that the electric core end after reeling is fixed, solved for a long time the battery battery core end has been stayed the gummed paper vestige with what hinge fixedly brought on the flexible packing material surface, problems such as fold, local accumulation, heat-sealing limit is crooked appear in the battery that influences the battery outward appearance and cause thus, can make the flexible packing lithium ion battery surfacing that makes, wrinkle resistant, outward appearance is good, avoids influencing the overall performance of battery fully.2) though the caking agent formula that contains NMP and PVDF mixture that preferably uses among the present invention is the oil phase coating adhesive prescription that often uses in positive level sheet is made, but because in this is used, its effect is that the positive electrode powder is evenly sticked to collection liquid surface, with carry out electric core end among the present invention and be adhesively fixed and have diverse adhering object, and has different composition weight proportions (when this mixture uses in the positive pole batching, the NMP consumption is 91%～97%, PVDF is 3%～9%, such proportioning can't directly apply in the inventive method), therefore should be with being not can directly extend to expect, this just why with gummed paper fixedly drawback so obviously and for a long time but do not have the reason of effective solution because do not find the bonding agent of suitable use; The caking agent formula that provides among the present invention is provided, promptly can reaches the good effect that is adhesively fixed; 3) bonding agent preparation method provided by the invention is easy, respond well.
Also the present invention is described in further detail in conjunction with the accompanying drawings below by embodiment.
[description of drawings]
Fig. 1 (a) and (b) are respectively the charging and discharging curve figure that adopts the flexible packing lithium ion battery that bonding agent of the present invention and the fixing electric core end of hinge produced.
Fig. 2 (a) and (b) are respectively the outside drawings that adopts the flexible packing lithium ion battery that bonding agent of the present invention and the fixing electric core end of hinge produced.
[embodiment]
The invention provides a kind of manufacture method of flexible packing lithium ion battery, comprise the step of electric core winding and the end fixed step of the electric core in back of reeling, behind coiling, with bonding agent electric core end is fixed in the end fixed step of electric core.Described bonding agent can be the bonding agent that contains N-methyl pyrrolidone and polyvinylidene fluoride, and described bonding agent also can be made up of N-methyl pyrrolidone and polyvinylidene fluoride.In bonding agent: NMP is used to dissolve PVDF as a kind of solvent, and when its content low excessively (＜60%), the dissolubility of PVDF is bad, can not dissolve fully; When its too high levels (＞90%), prepared bonding agent viscosity is less, and adhesive effect is bad.PVDF can improve the viscosity of bonding agent, when its content low excessively (＜10%), can cause prepared bonding agent rare excessively, and cementability is bad; When its too high levels (＞40%), viscosity can be excessive, and is mobile poor.
Above-mentioned bonding agent can make with the following method:
(a) N-methyl pyrrolidone and the polyvinylidene fluoride with weighing mixes;
(b) said mixture is vacuumized.
Such method is preferably adopted in mixing among preparation the present invention in the step (a) of employed bonding agent, and N-methyl pyrrolidone and polyvinylidene fluoride are at room temperature fully stirred 15～35min, makes it to form a kind of colloid substance.Also there is very big influence the time of stirring to bonding agent, mixing time too short (＜15min), the PVDF dissolving is inhomogeneous; Mixing time long (＞35min), viscosity can be excessive.Mixing time is preferably 20～30min.Why will vacuumize when preparing this bonding agent is because contain bubble in the colloid substance after stirring, if directly use can cause adhesive effect bad, comes off easily.
Below, be that the manufacturing of 383450 flexible packing lithium ion battery realizes that example describes realization of the present invention and effect in detail by concrete model.
(1) manufacturing of positive plate
Positive plate is made routinely flexible packing lithium ion battery positive plate production technology and is carried out.At first prepare slurry, be coated with, promptly get positive plate after the drying.
(2) manufacturing of negative plate
Negative plate is made routinely flexible packing lithium ion battery negative plate production technology and is carried out.At first make cathode size, it is coated with, promptly get negative plate after the drying.
(3) assembling of flexible-packed battery
Required size to cut according to model by the battery of " 383450 " above-mentioned positive and negative plate and diaphragm paper, the welding electrode ear carries out electric core winding then, its end is used adhesive securement, use the aluminum plastic film packaging by hot pressing again, inject electrolyte under the final drying condition, change into, vacuumize again and seal.
The best bonding agent that uses in this step is the mixture of 0.84gNMP and 0.16gPVDF, is made by such method: in blender, add 0.84gNMP and 0.16gPVDF, under the room temperature, fully stir 30min, it is mixed, form a kind of colloid substance.Obtained colloid substance is vacuumized, measure viscosity, viscosity is 2960mpa/s.
(4) test
The battery of finishing preliminary filling and change into is carried out loop test by following system, its system is: the 1st step, be 4.2V with 1CmA electric current constant current charge to voltage earlier, the 2nd step was 30mA with 4.2V voltage constant voltage charge to electric current, left standstill 5 minutes, the 3rd step, with 1CmA electric current constant-current discharge to cut-ff voltage 2.75V, the number of times that needs with the circulation of such system, its charging and discharging curve is seen Fig. 1 (a), and outward appearance is seen Fig. 2 (a).
Comparative Examples:
According to the process of above-mentioned same flexible-packed battery, just in step (3) behind the electric core winding end fix with gummed paper, obtain control cell, method of testing is the same, its charging and discharging curve is seen Fig. 1 (b), outward appearance is seen Fig. 2 (b).
Comparison diagram 1 (a) and (b) and Fig. 2 (a) and (b) are as can be seen, adopt the flexible packing lithium ion battery battery fixing of the inventive method manufacturing to compare with adopting gummed paper, performance is basic identical, and the flexible packing lithium ion battery outward appearance that adopts the inventive method to make is good, coats smooth.
The bonding agent that is adopted in the above-mentioned realization example can also use following various prescription and preparation method, and its resulting adhesive effect and above-mentioned realization example are basic identical, repeat no more.
Bonding agent preparation example one: in blender, add 0.75gNMP and 0.25gPVDF, under the room temperature, fully stir 20min, it is mixed, form a kind of colloid substance.Obtained colloid substance is vacuumized, measure viscosity, viscosity is 5210mpa/s.
Bonding agent preparation example two: in blender, add 0.82gNMP and 0.18gPVDF, under the room temperature, fully stir 25min, it is mixed, form a kind of colloid substance.Obtained colloid substance is vacuumized, measure viscosity, viscosity is 3507mpa/s.
Bonding agent preparation example three: in blender, add 0.87gNMP and 0.13gPVDF, under the room temperature, fully stir 25min, it is mixed, form a kind of colloid substance.Obtained colloid substance is vacuumized, measure viscosity, viscosity is 2533mpa/s.
Bonding agent preparation example four: in blender, add 0.90gNMP and 0.10gPVDF, under the room temperature, fully stir 30min, it is mixed, form a kind of colloid substance.Obtained colloid substance is vacuumized, measure viscosity, viscosity is 1810mpa/s.
Bonding agent preparation example five: in blender, add 0.95gNMP and 0.05gPVDF, under the room temperature, fully stir 35min, it is mixed, form a kind of colloid substance.Obtained colloid substance is vacuumized, measure viscosity, viscosity is 1056mpa/s.
Bonding agent preparation example six: in blender, add 0.6gNMP and 0.40gpVDF, under the room temperature, fully stir 15min, it is mixed, form a kind of colloid substance.Obtained colloid substance is vacuumized, measure viscosity, viscosity is 6515mpa/s.
Bonding agent preparation example seven: the preparation method of bonding agent and preparation example two are basic identical in this preparation example, uniquely different are, under the room temperature, stir 20min, and recording viscosity is 2012mpa/s.
Bonding agent preparation example eight: the preparation method of bonding agent and preparation example two are basic identical in this preparation example, uniquely different are, under the room temperature, stir 30min, and recording viscosity is 3850mpa/s.
Bonding agent preparation example nine: the preparation method of bonding agent and preparation example two are basic identical in this preparation example, uniquely different are, under the room temperature, stir 35min, and recording viscosity is 4487mpa/s.
Claims (10)
1, a kind of manufacture method of flexible packing lithium ion battery comprises the step of electric core winding and the end fixed step of the electric core in back of reeling, and it is characterized in that: with bonding agent electric core end is fixed in the end fixed step of electric core behind coiling.
2, according to the manufacture method of the described flexible packing lithium ion battery of claim 1, it is characterized in that: described bonding agent contains N-methyl pyrrolidone and polyvinylidene fluoride.
3, according to the manufacture method of the described flexible packing lithium ion battery of claim 1, it is characterized in that: described bonding agent is made up of N-methyl pyrrolidone and polyvinylidene fluoride.
4, according to the manufacture method of the described flexible packing lithium ion battery of claim 3, it is characterized in that: the weight percentage of described N-methyl pyrrolidone is 60%～90%, and the weight percentage of polyvinylidene fluoride is 10%～40%.
5, according to the manufacture method of the described flexible packing lithium ion battery of claim 4, it is characterized in that: the weight percentage of described N-methyl pyrrolidone is 75%～90%, and the weight percentage of polyvinylidene fluoride is 10%～25%.
6, according to the manufacture method of the described flexible packing lithium ion battery of claim 5, it is characterized in that: the weight percentage of described N-methyl pyrrolidone is 84%, and the weight percentage of polyvinylidene fluoride is 16%.
7, according to the manufacture method of the described flexible packing lithium ion battery of claim 1, it is characterized in that: the preparation method of described bonding agent may further comprise the steps:
(a) N-methyl pyrrolidone and the polyvinylidene fluoride with weighing mixes;
(b) said mixture is vacuumized.
8, according to the manufacture method of the described flexible packing lithium ion battery of claim 7, it is characterized in that: such method is adopted in the mixing in the described step (a), N-methyl pyrrolidone and polyvinylidene fluoride are at room temperature fully stirred 15～35min, make it to form a kind of colloid substance.
9, according to the manufacture method of the described flexible packing lithium ion battery of claim 8, it is characterized in that: mixing time is 20～30min.
10, a kind of flexible packing lithium ion battery that uses the described method of above-mentioned any one claim to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510020545XA CN100350668C (en) | 2005-03-15 | 2005-03-15 | Soft-packaged lithium ion battery manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510020545XA CN100350668C (en) | 2005-03-15 | 2005-03-15 | Soft-packaged lithium ion battery manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1767251A true CN1767251A (en) | 2006-05-03 |
| CN100350668C CN100350668C (en) | 2007-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200510020545XA Expired - Fee Related CN100350668C (en) | 2005-03-15 | 2005-03-15 | Soft-packaged lithium ion battery manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100350668C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103666334A (en) * | 2013-04-26 | 2014-03-26 | 杭州金色能源科技有限公司 | Glue for lithium-ion battery rolling core and preparation method of glue |
| CN111668431A (en) * | 2020-05-22 | 2020-09-15 | 惠州锂威新能源科技有限公司 | Diaphragm for winding battery, winding battery and preparation method of winding battery |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6439390B1 (en) * | 1999-07-29 | 2002-08-27 | Matsushita Electric Industrial Co., Ltd. | Battery package |
| CN1430295A (en) * | 2001-12-30 | 2003-07-16 | 比亚迪股份有限公司 | Lithium ion battery with soft package |
| CN1151576C (en) * | 2002-01-31 | 2004-05-26 | 江门三捷电池实业有限公司 | Method for manufacturing flexible-packaged lithium secondary cell |
| CN1196210C (en) * | 2002-07-17 | 2005-04-06 | 广州市鹏辉电池有限公司 | Soft-casting lithium iron battery and its making process |
| CN1221054C (en) * | 2003-06-18 | 2005-09-28 | 福建南平南孚電池有限公司 | Bag lithium ion battery preparing method and battery thereby |
| CN1314148C (en) * | 2003-10-31 | 2007-05-02 | 中信国安盟固利新能源科技有限公司 | Method for manufacturing pole ear of soft packaged lithium ion battery |
-
2005
- 2005-03-15 CN CNB200510020545XA patent/CN100350668C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103666334A (en) * | 2013-04-26 | 2014-03-26 | 杭州金色能源科技有限公司 | Glue for lithium-ion battery rolling core and preparation method of glue |
| CN103666334B (en) * | 2013-04-26 | 2016-03-30 | 杭州金色能源科技有限公司 | Lithium ion battery coil core glue and preparation method thereof |
| CN111668431A (en) * | 2020-05-22 | 2020-09-15 | 惠州锂威新能源科技有限公司 | Diaphragm for winding battery, winding battery and preparation method of winding battery |
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| Publication number | Publication date |
|---|---|
| CN100350668C (en) | 2007-11-21 |
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Effective date of registration: 20160921 Address after: An Zhen Zhongmu County 451470 Henan city of Zhengzhou Province Liu Zheng Qiao Village Patentee after: ZHENGZHOU BIKE BATTERY CO., LTD. Address before: Kwai Chung street Beek Industrial Park in Longgang District of Shenzhen City, Guangdong province 518119 Patentee before: Shenzhen Bak Battery Co., Ltd. |
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