CN202839841U - Positive pole piece of lithium ion battery - Google Patents
Positive pole piece of lithium ion battery Download PDFInfo
- Publication number
- CN202839841U CN202839841U CN201220373126XU CN201220373126U CN202839841U CN 202839841 U CN202839841 U CN 202839841U CN 201220373126X U CN201220373126X U CN 201220373126XU CN 201220373126 U CN201220373126 U CN 201220373126U CN 202839841 U CN202839841 U CN 202839841U
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- positive pole
- lithium ion
- collecting body
- plate current
- ion battery
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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
Abstract
The utility model belongs to the technical field of lithium ion batteries, and particularly relates to a positive pole piece of a lithium ion battery. The positive pole piece of the lithium ion battery comprises a positive pole current collector and a positive pole film piece, wherein the edge of the positive pole current collector is treated with gas plasma etching, the positive pole film piece is arranged on the surface of the positive pole current collector, the width of the positive pole current collector is smaller than the width of the positive pole film piece, and an oxide layer is arranged on the edge of the positive pole current collector. Compared with the prior art, a special positive pole piece structure with the indented current collector is formed by means of the gas plasma etching treatment, and therefore under the condition that the whole shape of the positive pole piece is not affected and complete coating of the positive pole film piece is kept, cutting burrs of the positive pole current collector can be eliminated on one hand, and on the other hand, by means of the indented structure of the positive pole current collector and insulation effect of the oxide layer outside the positive pole current collector, danger of a separation film being pierced by protruding out of un-eliminated burrs or an uneven surface produced from etching is avoided, and further safety of the lithium ion battery is effectively guaranteed.
Description
Technical field
The utility model belongs to technical field of lithium ion, relates in particular to a kind of anode slice of lithium ion battery.
Background technology
Along with the development of modern society, various mobile devices have had more and more widely application such as video camera, notebook computer, portable DVD player and digital camera etc., and are therefore, also increasing to the demand of high-energy battery.It is many outstanding that lithium ion battery is lightweight because having advantages of, energy storage is large, power is large, pollution-free, life-span long, the self discharge coefficient is little, temperature accommodation is wide in range etc., be subject to gradually people's favor, become the optimal power supply of mobile device, even in the fields such as Aeronautics and Astronautics, navigation, automobile, Medical Devices, also progressively replaced other conventional batteries.
Generally comprise the battery cell that several superpose successively in the lithium ion battery, each battery cell comprises anode pole piece, barrier film and the negative plate of mutual coiling or stack, wherein, barrier film is interval between the adjacent positive and negative plate, play the effect of electronics obstruct, ion conducting, be used for simultaneously keeping electrolyte.Anode pole piece comprises the plus plate current-collecting body that general employing aluminium foil is made and is attached on the plus plate current-collecting body, contains the anodal diaphragm of positive active material; Negative plate comprises the negative current collector that general employing Copper Foil is made and is attached on the negative current collector, contains the cathode membrane of negative electrode active material; Barrier film is the microporous membrane for adopting the techniques such as plasticizing, extraction to make then, and such structure is conducive to barrier film to the maintenance of the organic solvent electrolyte that contains lithium salts.When making lithium ion battery, as long as one or more above-mentioned battery cells are made battery, and on the coated outside of battery packing film, inject electrolyte in it afterwards, through and finding time, seal and get final product.Because the employed electrolyte of lithium ion battery is inflammable organic electrolyte at present, so secondary lithium battery is very high to security requirement.
The pole piece preparation process of lithium ion battery generally includes slurrying, films, the operations such as drying, die mould, cutting, although the manufacturing process of different vendor or different batteries may change the pole piece cutting operation that all is absolutely necessary to some extent.Because lithium ion battery mostly adopts aluminium foil as plus plate current-collecting body, when determining its cutting, the characteristic of aluminium self easily produces burr in edge.As shown in Figure 1, or the burr that a little protrude from the edge of anodal diaphragm 240 and have some cuttings produce concordant with the edge of anodal diaphragm 240 as aluminium foil 220 edges of plus plate current-collecting body on the anode pole piece 200, therefore after this anode pole piece 200 and barrier film and negative plate being superposeed, the cutting burr of aluminium foil 220 just is easy to puncture barrier film, so that contacts with adjacent cathode membrane and be short-circuited.The battery of short circuit can heat up rapidly, thereby causes inflammable organic electrolyte to catch fire, even causes battery to be blasted.
In order to remove the burr at anode pole piece edge, application number is that the Chinese patent application of CN200910036707.7 discloses a kind of method that the anode pole piece coiled strip is removed burr with dipping by lye.Although this wet treatment also can be removed the burr of plus plate current-collecting body cut edge, exists capillarity and operation to realize the problems such as difficulty.And, may also can produce certain burr with the coiled strip edge behind the dipping by lye, that is to say, in deburring, can produce burr again, certain potential safety hazard is still arranged.
In view of this, necessaryly provide a kind of anode slice of lithium ion battery, the burrs on edges of the plus plate current-collecting body of this anode pole piece greatly reduces even does not have, thereby greatly improves the fail safe of the battery that uses this anode pole piece.
The utility model content
The purpose of this utility model is: for the deficiencies in the prior art, and provide a kind of anode slice of lithium ion battery, the burrs on edges of the plus plate current-collecting body of this anode pole piece greatly reduces even does not have, thereby greatly improves the fail safe of the battery that uses this anode pole piece.
In order to achieve the above object, the utility model adopts following technical scheme: a kind of anode slice of lithium ion battery, comprise that its edge is through the plus plate current-collecting body and the anodal diaphragm that is arranged at described anode collection surface of gaseous plasma etching processing, the width of described plus plate current-collecting body is less than the width of described anodal diaphragm, and the edge of described plus plate current-collecting body is provided with oxide layer.
As a kind of improvement of the utility model anode slice of lithium ion battery, the thickness of described oxide layer is 1 ~ 10 μ m.
As a kind of improvement of the utility model anode slice of lithium ion battery, the thickness of described oxide layer is 1 ~ 3 μ m.
As a kind of improvement of the utility model anode slice of lithium ion battery, the thickness of described oxide layer is 2 μ m.
A kind of improvement as the utility model anode slice of lithium ion battery, on Width, distance between the left hand edge of described plus plate current-collecting body and the left hand edge of described anodal diaphragm is 0 ~ 50 μ m, distance between the right hand edge of described plus plate current-collecting body and the right hand edge of described anodal diaphragm is 0 ~ 50 μ m, and the left hand edge of described plus plate current-collecting body and right hand edge are all between the left hand edge and right hand edge of described anodal diaphragm.
A kind of improvement as the utility model anode slice of lithium ion battery, on Width, distance between the left hand edge of described plus plate current-collecting body and the left hand edge of described anodal diaphragm is 10 ~ 45 μ m, and the distance between the right hand edge of described plus plate current-collecting body and the right hand edge of described anodal diaphragm is 10 ~ 45 μ m.
A kind of improvement as the utility model anode slice of lithium ion battery, on Width, distance between the left hand edge of described plus plate current-collecting body and the left hand edge of described anodal diaphragm is 30 μ m, and the distance between the right hand edge of described plus plate current-collecting body and the right hand edge of described anodal diaphragm is 30 μ m.
With respect to prior art, anode slice of lithium ion battery of the present utility model is by the method for gaseous plasma etching processing, form the special anode pole piece structure (being that the width of plus plate current-collecting body is less than the width of anodal diaphragm) of collector " indentation ", in the situation that do not affect the anode pole piece global shape and keep anodal diaphragm coating complete, the cutting burr of plus plate current-collecting body can be removed on the one hand, the insulating effect of the oxide layer in the indentation structure of plus plate current-collecting body and its outside on the other hand, thereby can avoid the burr that does not eliminate or the rough surface that produces owing to etching to stretch out the risk that punctures barrier film, effectively guarantee the safety of lithium ion battery.
Description of drawings
Below in conjunction with accompanying drawing and each embodiment, the utility model and useful technique effect thereof are elaborated.
Fig. 1 is the structural representation of anode pole piece of the prior art.
Fig. 2 is schematic top plan view of the present utility model.
Fig. 3 is cross-sectional schematic of the present utility model.
Fig. 4 is the structural representation of the device that the burr on the removal plus plate current-collecting body adopts in the utility model embodiment.
Embodiment
As shown in Figures 2 and 3, a kind of anode slice of lithium ion battery that the utility model provides, comprise that its edge is through the plus plate current-collecting body 10 and the anodal diaphragm 20 that is arranged at plus plate current-collecting body 10 surfaces of gaseous plasma etching processing, the width of plus plate current-collecting body 10 is less than the width of anodal diaphragm 20, and the edge of plus plate current-collecting body 10 is provided with oxide layer 30.Thereby arranging of oxide layer 30 can avoid the burr that does not eliminate or the rough surface that produces owing to etching to stretch out the risk that punctures barrier film.
Wherein, the thickness of oxide layer 30 is 1 ~ 10 μ m.If the thickness of oxide layer 30 is too little, thereby can't effectively avoid the burr that does not eliminate or the rough surface that produces owing to etching to stretch out the risk that punctures barrier film.And if the thickness of oxide layer 30 is too large, can cause again the waste of unnecessary material.
The thickness of oxide layer 30 is 1 ~ 3 μ m, and this is preferred scope.
The thickness of oxide layer 30 is 2 μ m, and this is better and select.Oxide layer 30 can be arranged on by modes such as splash, vacuum-coating or coatings the edge of plus plate current-collecting body 10.
On Width, distance between the left hand edge of the left hand edge of plus plate current-collecting body 10 and anodal diaphragm 20 is that 0 ~ 50 μ m(is etch depth), distance between the right hand edge of the right hand edge of plus plate current-collecting body 10 and anodal diaphragm 20 is 0 ~ 50 μ m, and the left hand edge of plus plate current-collecting body 10 and right hand edge are all between the left hand edge and right hand edge of anodal diaphragm 20.Etching depth is in 0 ~ 50 μ m scope.The restriction of etching depth is to reach the purpose of removing burr in order both to guarantee, does not destroy again anode pole piece.The indentation distance is larger, and the burr that may not be divided and the coarse projection that is produced by gas etching all can be wrapped by outer field diaphragm, and security performance is better.But distance too conference causes the edge of diaphragm not have collector to support, and occurs coming off.And etching depth is too large, can produce not right destruction to the zone without positive active material on the plus plate current-collecting body 10, affects the tab welding of subsequent handling.Therefore the distance of indentation is more excellent result at 0 ~ 50 μ m.
Preferably, on Width, the distance between the left hand edge of the left hand edge of plus plate current-collecting body 10 and anodal diaphragm 20 is 10 ~ 45 μ m, and the distance between the right hand edge of the right hand edge of plus plate current-collecting body 10 and anodal diaphragm 20 is 10 ~ 45 μ m.
Preferred, on Width, the distance between the left hand edge of the left hand edge of plus plate current-collecting body 10 and anodal diaphragm 20 is 30 μ m, and the distance between the right hand edge of the right hand edge of plus plate current-collecting body 10 and anodal diaphragm 20 is 30 μ m.
During concrete operations, produce that plasma bombards at a high speed and chemical reaction occurs to remove the burr of plus plate current-collecting body 10 cut edges with burr (burr is the oxide of aluminium or aluminium) on the plus plate current-collecting body 10 by gas ionization, produce simultaneously the structure of plus plate current-collecting body 10 indentations and its outside and be provided with layer of oxide layer by modes such as coatings and play insulating effect.The device that burr on the removal plus plate current-collecting body 10 adopts as shown in Figure 4, this device comprises vacuum cavity 1, be used for placing the rotatable tray rack 3 of anode pole piece 2, gas distributing system 4, ionization cavity 5, plasma generator 6, back bias voltage power supply 7 and be used for carrying out the vacuum-control(led) system 8 of vent gas treatment, rotatable tray rack 3 is arranged in the vacuum cavity 1, ionization cavity 5 is connected between plasma generator 6 and vacuum cavity 1 and with gas distributing system 4, back bias voltage power supply 7 is electrically connected with ionization cavity 5 and rotatable tray rack 3 respectively, and vacuum-control(led) system 8 is connected with vacuum cavity 1.
Wherein, plasma generator 6 comprises radio-frequency power supply 61 and electrode 62, and electrode 62 is connected with ionization cavity 5, and electrode 62 is electrically connected with radio-frequency power supply 61.
During actual the use, will place under the electronic scanner microscope through the edge of the anode pole piece of cutting die assembly cutting first and observe, burr appears in discovery plus plate current-collecting body 10 cut channel edges, and the burr length range is between 0 ~ 30 μ m.
Anode pole piece being reeled is placed on the rotatable tray rack 3 again, and this pallet places in the vacuum cavity 1 of sealing, admixture of gas (Cl
2, BCl
3, Ar and O
2) by gas distributing system 4 according to volume ratio (1 ~ 5): (1 ~ 5): (0.5 ~ 2): (5 ~ 15) flow in the ionization cavity 5, the electrode 62 of plasma generator 6 produces enough strong magnetic field under the effect of radio-frequency power supply 61, the admixture of gas that enters ionization cavity 5 is become plasma.
Back bias voltage power supply 7 forms electric field between ionization cavity 5 and anode pole piece, plasma in the ionization cavity 5 enters vacuum cavity 1 under electric field action, bombard at a high speed anode pole piece, and with anode pole piece in the burr (the burr composition is the oxide of aluminium or aluminium) at exposed plus plate current-collecting body 10 cut channel edges react, reaction time is 20 ~ 60min, thereby the burr on the anode pole piece is removed.The equation of these gases and burr generation chemical reaction is respectively: Al2O3+3BCl3 → 2AlCl3+3BOCl (1); 2Al+3Cl2 → 2AlCl3 (2); 2Al+3O2 → 2Al2O3 (3).
Reacted product is discharged and the process vent gas treatment by vacuum-control(led) system 8 suctions.Because the above-mentioned gas material does not react with anodal diaphragm 20 and positive active material wherein, so the deburring process can not cause harmful effect to anodal diaphragm 20 basically.At last form the oxide layer 30 that one deck plays insulating effect in the outside of plus plate current-collecting body 10 by modes such as coatings.
After processing, as shown in Figure 3, the cut edge on the plus plate current-collecting body 10 and on burr all be etched and remove.The edge of the anode pole piece after will processing through plasma gas places under the electronic scanner microscope again to be observed, find that the cut channel edge of plus plate current-collecting body 10 is without burr, the smooth of the edge of plus plate current-collecting body 10, the little serration of part (being caused by gas etching), the indentation distance of plus plate current-collecting body 10 is 0 ~ 50 μ m.
Since anodal diaphragm 20 not with process gas reaction, so this moment, the width of plus plate current-collecting body 10 was shorter than barrier film, its edge is in the retraction barrier film, and because also fully removal of the burr on the plus plate current-collecting body 10, and form the oxide layer 30 that one deck plays insulating effect in the passivation of the outside of plus plate current-collecting body 10, therefore plus plate current-collecting body 10 can not occur again puncture behind the barrier film security incident with the cathode membrane contact short circuit of cathode pole piece.And even barrier film is because breakage has occured other reasons, the plus plate current-collecting body 10 in the anodal diaphragm 20 of retraction also is difficult to touch cathode membrane, and therefore anode pole piece of the present utility model can effectively guarantee the safety of lithium ion battery.
In addition, chemical reaction such as the barrier film between negative current collector, cathode membrane, negative electrode active material, positive/negative plate etc., does not occur in other materials in above-mentioned gas material and the battery cell, or it is very low that the activity of chemical reaction occurs.
In sum, the utility model is by the method for plasma etch processes, in the situation that do not affect the anode pole piece edge shape and keep anodal diaphragm 20 coatings complete, cut edge and the burr of plus plate current-collecting body 10 are removed simultaneously, also short as the anodal diaphragm 20 of the Width of plus plate current-collecting body 10 after processing, can't be exposed to the anode pole piece edge, therefore can not puncture barrier film again and be short-circuited with cathode membrane, even in the situation that barrier film because the other reasons breakage, can not contact with cathode membrane yet, thus the security performance of Effective Raise lithium ion battery.
Need to prove, although this specification is only with Cl
2, BCl
3, to be example describe the gaseous matter in the utility model design for Ar, O2, but those skilled in the art is according to the announcement of this specification, and can adopt does not affect the anode pole piece edge contour and do not affect other complete gaseous matters of anodal diaphragm coating yet.In addition, do not get rid of and adopt similar dry process method anticathode pole piece to carry out burr after etching processing is removed the collector cutting of cathode pole piece edge.
The according to the above description announcement of book and instruction, the utility model those skilled in the art can also carry out suitable change and modification to above-mentioned execution mode.Therefore, the embodiment that discloses and describe above the utility model is not limited to also should fall in the protection range of claim of the present utility model modifications and changes more of the present utility model.In addition, although used some specific terms in this specification, these terms do not consist of any restriction to the utility model just for convenience of description.
Claims (7)
1. anode slice of lithium ion battery, comprise that its edge is through the plus plate current-collecting body and the anodal diaphragm that is arranged at described anode collection surface of gaseous plasma etching processing, it is characterized in that: the width of described plus plate current-collecting body is less than the width of described anodal diaphragm, and the edge of described plus plate current-collecting body is provided with oxide layer.
2. anode slice of lithium ion battery according to claim 1, it is characterized in that: the thickness of described oxide layer is 1 ~ 10 μ m.
3. anode slice of lithium ion battery according to claim 2, it is characterized in that: the thickness of described oxide layer is 1 ~ 3 μ m.
4. anode slice of lithium ion battery according to claim 3, it is characterized in that: the thickness of described oxide layer is 2 μ m.
5. anode slice of lithium ion battery according to claim 1, it is characterized in that: on Width, distance between the left hand edge of described plus plate current-collecting body and the left hand edge of described anodal diaphragm is 0 ~ 50 μ m, distance between the right hand edge of described plus plate current-collecting body and the right hand edge of described anodal diaphragm is 0 ~ 50 μ m, and the left hand edge of described plus plate current-collecting body and right hand edge are all between the left hand edge and right hand edge of described anodal diaphragm.
6. anode slice of lithium ion battery according to claim 5, it is characterized in that: on Width, distance between the left hand edge of described plus plate current-collecting body and the left hand edge of described anodal diaphragm is 10 ~ 45 μ m, and the distance between the right hand edge of described plus plate current-collecting body and the right hand edge of described anodal diaphragm is 10 ~ 45 μ m.
7. anode slice of lithium ion battery according to claim 6, it is characterized in that: on Width, distance between the left hand edge of described plus plate current-collecting body and the left hand edge of described anodal diaphragm is 30 μ m, and the distance between the right hand edge of described plus plate current-collecting body and the right hand edge of described anodal diaphragm is 30 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220373126XU CN202839841U (en) | 2012-07-31 | 2012-07-31 | Positive pole piece of lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220373126XU CN202839841U (en) | 2012-07-31 | 2012-07-31 | Positive pole piece of lithium ion battery |
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| Publication Number | Publication Date |
|---|---|
| CN202839841U true CN202839841U (en) | 2013-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201220373126XU Expired - Lifetime CN202839841U (en) | 2012-07-31 | 2012-07-31 | Positive pole piece of lithium ion battery |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104282884A (en) * | 2013-07-05 | 2015-01-14 | 深圳市大成精密设备有限公司 | Processing technology and equipment for removing aluminum skimmings of lithium battery electrode plate by use of plasma |
| CN106252665A (en) * | 2016-09-07 | 2016-12-21 | 清华大学 | Affluxion body in lithium ion batteries and surface spikes processing method thereof |
| CN108352492A (en) * | 2015-08-31 | 2018-07-31 | 宁德新能源科技有限公司 | Secondary cell battery core and its coiling and molding system |
| CN114094053A (en) * | 2021-11-05 | 2022-02-25 | 惠州锂威新能源科技有限公司 | Tail aluminum foil processing method for improving safety test of lithium ion battery |
| US11923498B2 (en) | 2014-01-17 | 2024-03-05 | Ningde Amperex Technology Limited | Lithium-ion battery having desirable safety performance |
-
2012
- 2012-07-31 CN CN201220373126XU patent/CN202839841U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104282884A (en) * | 2013-07-05 | 2015-01-14 | 深圳市大成精密设备有限公司 | Processing technology and equipment for removing aluminum skimmings of lithium battery electrode plate by use of plasma |
| US11923498B2 (en) | 2014-01-17 | 2024-03-05 | Ningde Amperex Technology Limited | Lithium-ion battery having desirable safety performance |
| CN108352492A (en) * | 2015-08-31 | 2018-07-31 | 宁德新能源科技有限公司 | Secondary cell battery core and its coiling and molding system |
| CN108352492B (en) * | 2015-08-31 | 2021-08-31 | 宁德新能源科技有限公司 | Secondary battery core |
| US11329352B2 (en) | 2015-08-31 | 2022-05-10 | Ningde Amperex Technology Limited | Secondary battery cell and winding formation system thereof |
| CN106252665A (en) * | 2016-09-07 | 2016-12-21 | 清华大学 | Affluxion body in lithium ion batteries and surface spikes processing method thereof |
| CN106252665B (en) * | 2016-09-07 | 2019-02-05 | 清华大学 | Affluxion body in lithium ion batteries and its surface spikes processing method |
| CN114094053A (en) * | 2021-11-05 | 2022-02-25 | 惠州锂威新能源科技有限公司 | Tail aluminum foil processing method for improving safety test of lithium ion battery |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130327 |