CN104993176A - Winding type lithium ion electric core body and preparation method thereof - Google Patents
Winding type lithium ion electric core body and preparation method thereof Download PDFInfo
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- CN104993176A CN104993176A CN201510445622.XA CN201510445622A CN104993176A CN 104993176 A CN104993176 A CN 104993176A CN 201510445622 A CN201510445622 A CN 201510445622A CN 104993176 A CN104993176 A CN 104993176A
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- winding
- core body
- lithium ion
- backing plate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- 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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- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
A winding type lithium ion electric core body and a preparation method thereof are provided; the method includes that an anode piece, a diaphragm and a cathode piece are wound on a winding needle of a winding device, and a wound core body formed outside the winding needle is obtained, and the diaphragm is allowed to be spaced between the anode piece and the cathode piece on the wound body; when winding is carried out to a predetermined extent, winding pauses, a pad plate is placed outside the current wound core body, then winding is continued, the subsequent anode piece, diaphragm and cathode piece are wound outside the pad plate until winding is completed, the wound body is fixed, and the pad plate is located in the current wound core body; the pad plate is pulled out from the interior of a wound core, and thus the winding type lithium ion electric core body is obtained. With application of the preparation method, the difference, caused by action of the centrifugal force in the winding process, of winding tension between all the wound layers is facilitated to be reduced, and the uniformity of the thickness of the final electric core is facilitated to be improved.
Description
Technical field
The present invention relates to lithium ion battery preparation field, particularly relate to a kind of Wind lithium ion core body with and preparation method thereof.
Background technology
Along with the development of electronic technology, miniaturized equipment gets more and more, and the particularly marketization of smart mobile phone, causes the requirement of power supply also more and more higher.Lithium ion battery, by feat of the performance of its brilliance, is therefore widely used the every aspect in people's daily life.
Divide according to inside lithium ion cell structure or the mode of production, lithium ion battery can be divided into two classes: takeup type and the structure such as stacked.According to the products characteristics of different production fields, the difference of the hardware device of each enterprise, so the structure of inside lithium ion cell core is also discrepant.The lithium ion battery that current our company produces adopts a kind of takeup type structure.
Comparatively speaking, the production efficiency of the lithium ion battery of its takeup type structure is high, therefore in the product structure of the current marketization, the main flow mode of production is belonged to, but the lithium ion battery also existing defects that this mode of production is produced, bring difficulty to like this lithium ion battery manufacturing enterprise, final affect product quality or reduce conforming product rate, cause production cost to increase.The particularly battery of takeup type structure, no matter be manual, or after mechanized winding, all there is distortion probability in various degree, but adopt machinery carry out reel institute produce be out of shape probability higher, its reason is the increase along with pole piece length, when adopting machinery winding, due to the effect of centrifugal force in winding process, the Contact of pole piece and pole piece is tighter, in addition, add in apparatus factor, various material property, production process and cause the impacts such as the contraction of barrier film and lithium ion battery operation principle due to baking, probability of its distortion increases.Pole piece is after fluid injection and after changing in charge and discharge process and in battery charge and discharge process in addition, Lithium-ion embeding or deviate from, battery core also can produce and expand or shrink, the tension force of inside battery does not have Free up Memory, or tension force Free up Memory is everywhere uneven, therefore the distortion probability of coiled lithium ion battery increases, particularly thickness is at the battery of more than 6.0mm, distortion super thick ratio is particularly outstanding, have a strong impact on lithium ion battery quality (as: outward appearance and thickness), finally cause battery because being out of shape the requirement not reaching client, and can not as qualified product shipment.Meanwhile, from the angle of equipment, in winding process, centrifugal force is inevitable, and the size of the centrifugal force in winding process is relevant with pole piece length, winding speed etc., and pole piece is longer, and winding centrifugal force is relatively large; Speed is faster, and winding centrifugal force is larger, and the probability of the lithium ion battery distortion therefore adopting up-coiler to produce is relatively higher.
Summary of the invention
One of object of the embodiment of the present invention be to provide a kind of Wind lithium ion core body with and preparation method thereof, application the technical program, be conducive to reducing in winding process the difference of the winding tension between each winding layer of causing due to centrifugal action, be conducive to the uniformity improving each winding layer.
The preparation method of a kind of Wind lithium ion core body that the embodiment of the present invention provides, comprising:
The volume pin of winding apparatus reels described positive plate, barrier film and negative plate, obtains being formed in the core body outside described volume pin, makes on coiling body, be interposed between described positive plate and described negative plate between described barrier film;
When being wound to predetermined degree, suspend winding, toward current winding cores external placement one backing plate, continue winding, follow-up positive plate, barrier film and negative plate are wound on outside described backing plate, until it is complete to reel, fixing described coiling body, described backing plate is positioned at current described core body;
In described core, extract described backing plate out, obtain Wind lithium ion core body.
Alternatively, the thickness of described backing plate is 0.5mm--3.0mm.
Alternatively, the length of described backing plate is 1 to 3 times of described core body length.
Alternatively, the winding speed after placing described backing plate is less than the winding speed before placing described backing plate.
Second aspect, a kind of Wind lithium ion core body that the embodiment of the present invention provides, it comprises:
Core body, described core body is in rolled from inside to outside, and described coiling body is formed by positive plate, negative plate and membrane winding, is interposed between described positive plate and described negative plate between described barrier film;
The direction backing plate identical with the wireline reel direction of described coiling body is also inserted with in described coiling body.
Alternatively, the thickness of described backing plate is 0.5mm--3.0mm.
Alternatively, the length of described backing plate is 1 to 3 times of described core body length.
Therefore, adopt the present embodiment technical scheme, application the present embodiment technical scheme, because the present embodiment is when reeling, realize the technical scheme of segmentation winding but not continuous reeling, be conducive to reducing in winding process the difference of the winding tension between each winding layer of causing due to centrifugal action, be conducive to the uniformity of each winding layer improving the battery finally obtained.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, does not form inappropriate limitation of the present invention.
Structural representation during backing plate is inserted when Fig. 1 is winding battery core body provided by the invention;
Fig. 2 is the structural representation that after winding provided by the invention, backing plate is positioned at battery core body position.
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing and specific embodiment, be used for explaining the present invention in this illustrative examples of the present invention and explanation, but not as a limitation of the invention.
Present embodiments provide a kind of preparation method of Wind lithium ion core body, the Wind lithium ion core body of the present embodiment improves on the basis of original winding process, and this method mainly comprises the following steps:
Winding positive electrode sheet 101, barrier film 102 and negative plate 104 on the volume pin 105 of winding apparatus, obtain being formed in the core body outside volume pin.Wherein be interposed between barrier film 102 between positive plate 101 and negative plate 104 on coiling body, see Fig. 1, shown in 2, when being wound to predetermined degree, suspend winding, toward current winding cores external placement one backing plate 103, continue winding, make follow-up positive plate 101, barrier film 102 and negative plate 104 are wound on outside backing plate 103, complete until reel, the coiling body of the present embodiment is taken off on volume pin 105, fix this coiling body (such as realizing the fixing sizing of coiling body at the outer rubberized fabric of coiling body), now backing plate 103 be wound onto the coiling body before inserting backing plate 103 and insert backing plate 103 after rear half-turn winding layer between, then along the winding axial direction of coiling body, in core, backing plate 103 is extracted out along wireline reel direction, obtain the Wind lithium ion core body of the present embodiment.
Therefore, application the present embodiment technical scheme, because the present embodiment is when reeling, realize the technical scheme of segmentation winding but not continuous reeling, be conducive to reducing in winding process the difference of the winding tension between each winding layer of causing due to centrifugal action, be conducive to the uniformity improving each winding layer.
In addition, change into in partial volume process at lithium ion battery, due to coiled lithium ion battery Lithium-ion embeding or deviate from the process of negative plate 104 graphite linings, negative pole thickness can be caused to produce expansion to a certain degree and contraction, the characteristic that this lithium ion battery is intrinsic, cannot change from principle.And if adopt the core mode of traditional winding method battery core, the inner space of Wind lithium ion core body is compact, does not have space when causing pole piece to expand, cause lithium ion battery because pole piece expand and be out of shape.And adopt the present embodiment technical scheme, in winding process, increase backing plate 103 reel together, then after winding terminates, extract this backing plate 103, thus the space can reserved in the Wind lithium ion core body middle part finally obtained to a certain degree, therefore the lithium ion battery adopting the present embodiment technical scheme to obtain can not cause distortion because pole piece expands.
As the signal of the present embodiment, the thickness of the backing plate 103 of this enforcement and length can be determined according to the specification of current Wind lithium ion core body, battery core body is thicker, and the thickness of backing plate 103 is thicker, and the thickness of this backing plate 103 is generally between 0.5 millimeter to 3 millimeters.
The length of this backing plate 103 is traditionally arranged to be 1 to 3 times of core body length, is convenient to backing plate 103 and inserts and backing plate 103 draw out operation.
As the signal of the present embodiment, the setting below when the speed of the present embodiment to winding is also carried out, makes the winding speed after placement backing plate 103 be less than the winding speed before placing backing plate 103.
As the signal of the present embodiment, before making to place backing plate 103, winding apparatus reels with the winding speed of 150 revs/min, when core arrives predetermined windings at windings, and arrestment, stop winding, one of given size piece of backing plate 103 is placed into positive plate 101 and between core, then steps on the foot switch of winding apparatus, start winding apparatus, winding apparatus is made to proceed winding, till having rolled up remaining pole piece with the winding speed of 135 revs/min.
As the signal of the present embodiment, preferably but the half be not limited to when be wound to the predetermined number of total coils of Wind lithium ion core body, stop winding inserting backing plate 103, make backing plate 103 be positioned at the middle part of the thickness of winding battery core body, be conducive to the performance improving battery further.
After obtaining above-mentioned Wind lithium ion core body, conventionally Wind lithium ion core body is loaded in type aluminum plastic film, and carry out sealing and forming semi-finished product lithium ion battery, then as the moisture content in semi-finished product lithium ion battery removed by drying chamber, and then carry out electrolyte filling, dry remove moisture content, then by changing into, aging, vacuum degassing encapsulation forms flexible package coiled lithium ion battery with the operation such as shaping.
Analysis of experimental data
In order to further illustrate the effect of the technical scheme of the present embodiment, analyze below by way of experimental data:
Reference examples:
This reference examples provides a kind of coiled lithium ion battery, and the specification of this lithium ion battery is for being 7949116.Wherein, 794911 represent that the thick, wide, long of this lithium ion battery is of a size of 7.9mm, 49mm, 116mm.
This battery adopts winding process to make, and adopt continuous average rate winding method, winding speed is 135 revs/min.
Embodiment 1:
The same reference examples of specification of the present embodiment, battery and the reference examples battery institute difference of the present embodiment 1 are:
This battery adopts the discontinuous winding method described in continuous embodiment: when windings reaches 1/2 of predetermined number of total coils, suspend winding, insert backing plate, continue winding, winding speed before time-out is: 150 revs/min, and the winding speed inserted after backing plate is 135 revs/min.
Embodiment 2:
The same reference examples of specification of the present embodiment, battery and the embodiment 1 battery institute difference of the present embodiment 2 are:
When windings reaches 1/3 of predetermined number of total coils, suspend winding, insert backing plate, continue winding, the winding speed before time-out is: 150 revs/min, and the winding speed inserted after backing plate is 135 revs/min.
Embodiment 3:
The same reference examples of specification of the present embodiment, battery and the embodiment 1 battery institute difference of the present embodiment 3 are:
When windings reaches 1/2 of predetermined number of total coils, suspend winding, the winding speed inserted before and after backing plate is: 150 revs/min.
Embodiment 4:
The same reference examples of specification of the present embodiment, battery and the embodiment 1 battery institute difference of the present embodiment 4 are:
When windings reaches 1/2 of predetermined number of total coils, suspend winding, the winding speed inserted before and after backing plate is: 135 revs/min.
Embodiment 5:
The same reference examples of specification of the present embodiment, battery and the embodiment 1 battery institute difference of the present embodiment 5 are:
When windings reaches 2/3 of predetermined number of total coils, suspend winding, insert backing plate, continue winding, the winding speed before time-out is: 150 revs/min, and the winding speed inserted after backing plate is 135 revs/min.
Get the battery of above-mentioned reference examples, embodiment 1-5, carry out random sampling, the thickness (after taking off backing plate) of the lithium ion battery finally obtained respectively is tested, and obtains the experimental data table shown in table one:
Table one: experimental data contrast table
Illustrate, this sample of expression of above-mentioned cell thickness band underscore is the abnormal battery of distortion (applying the battery that this coiling body finally obtains).
Therefore, adopt the present embodiment technical scheme, relative to the reference examples not adding backing plate, in battery winding process, add upper padding plate can avoid being out of shape in battery winding process, improve the qualification rate of battery.As the signal of the present embodiment, after winding acquires a certain degree (1/2 of total Volumes), adopt the present embodiment technical scheme greatly can reduce the deformation extent of battery, and adopt lower volume speed add backing plate after battery reaches total Volumes 1/2 after, battery can be made more smooth, make battery thinner, reduce the thickness of battery.
Above-described execution mode, does not form the restriction to this technical scheme protection range.The amendment done within any spirit at above-mentioned execution mode and principle, equivalently to replace and improvement etc., within the protection range that all should be included in this technical scheme.
Claims (7)
1. a preparation method for Wind lithium ion core body, is characterized in that, comprising:
The volume pin of winding apparatus reels described positive plate, barrier film and negative plate, obtains being formed in the core body outside described volume pin, makes on coiling body, be interposed between described positive plate and described negative plate between described barrier film;
When being wound to predetermined degree, suspend winding, toward current winding cores external placement one backing plate, continue winding, follow-up positive plate, barrier film and negative plate are wound on outside described backing plate, until it is complete to reel, fixing described coiling body, described backing plate is positioned at current described core body;
In described core, extract described backing plate out, obtain Wind lithium ion core body.
2. the preparation method of coiled lithium ion battery according to claim 1, is characterized in that,
The thickness of described backing plate is 0.5mm--3.0mm.
3. the preparation method of coiled lithium ion battery according to claim 1, is characterized in that,
The length of described backing plate is 1 to 3 times of described core body length.
4. the preparation method of coiled lithium ion battery according to claim 1, is characterized in that,
The winding speed placed after described backing plate is less than the winding speed before placing described backing plate.
5. a Wind lithium ion core body, is characterized in that, comprising:
Core body, described core body is in rolled from inside to outside, and described coiling body is formed by positive plate, negative plate and membrane winding, is interposed between described positive plate and described negative plate between described barrier film;
The direction backing plate identical with the wireline reel direction of described coiling body is also inserted with in described coiling body.
6. Wind lithium ion core body according to claim 5, is characterized in that, the thickness of described backing plate is 0.5mm--3.0mm.
7. the Wind lithium ion core body according to claim 5 or 6, is characterized in that, the length of described backing plate is 1 to 3 times of described core body length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510445622.XA CN104993176A (en) | 2015-07-27 | 2015-07-27 | Winding type lithium ion electric core body and preparation method thereof |
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| CN201510445622.XA CN104993176A (en) | 2015-07-27 | 2015-07-27 | Winding type lithium ion electric core body and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112164831A (en) * | 2020-10-12 | 2021-01-01 | 珠海格力能源环境技术有限公司 | Lithium battery and winding method thereof |
| CN112670599A (en) * | 2020-12-23 | 2021-04-16 | 惠州市恒泰科技股份有限公司 | Battery cell winding method and battery preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103151551A (en) * | 2011-12-06 | 2013-06-12 | 丰田自动车株式会社 | Method of battery production |
| CN103887565A (en) * | 2014-03-10 | 2014-06-25 | 东莞锂威能源科技有限公司 | Method for manufacturing super-thick high-energy-density polymer lithium ion battery cell |
| CN104979582A (en) * | 2015-05-27 | 2015-10-14 | 深圳市动力聚能科技有限公司 | Low-deformation rolling type flexible package lithium-ion battery and production method thereof |
| CN204793091U (en) * | 2015-07-27 | 2015-11-18 | 湖北宇隆新能源有限公司 | Coiling formula lithium ion cell body |
-
2015
- 2015-07-27 CN CN201510445622.XA patent/CN104993176A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151551A (en) * | 2011-12-06 | 2013-06-12 | 丰田自动车株式会社 | Method of battery production |
| CN103887565A (en) * | 2014-03-10 | 2014-06-25 | 东莞锂威能源科技有限公司 | Method for manufacturing super-thick high-energy-density polymer lithium ion battery cell |
| CN104979582A (en) * | 2015-05-27 | 2015-10-14 | 深圳市动力聚能科技有限公司 | Low-deformation rolling type flexible package lithium-ion battery and production method thereof |
| CN204793091U (en) * | 2015-07-27 | 2015-11-18 | 湖北宇隆新能源有限公司 | Coiling formula lithium ion cell body |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112164831A (en) * | 2020-10-12 | 2021-01-01 | 珠海格力能源环境技术有限公司 | Lithium battery and winding method thereof |
| CN112670599A (en) * | 2020-12-23 | 2021-04-16 | 惠州市恒泰科技股份有限公司 | Battery cell winding method and battery preparation method |
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Application publication date: 20151021 |