CN104600250A - Preparation method of lithium ion battery multi-pole-ear pole piece, preparation method of pole group and battery - Google Patents
Preparation method of lithium ion battery multi-pole-ear pole piece, preparation method of pole group and battery Download PDFInfo
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- CN104600250A CN104600250A CN201410674212.8A CN201410674212A CN104600250A CN 104600250 A CN104600250 A CN 104600250A CN 201410674212 A CN201410674212 A CN 201410674212A CN 104600250 A CN104600250 A CN 104600250A
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- lithium ion
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
-
- 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 preparation method of a lithium ion battery multi-pole-ear pole piece, a preparation method of a multi-pole-ear lithium ion battery pole group and a battery. The preparation method of the pole piece comprises the steps: a current collector is evenly coated with an active slurry in a full range, then rolled and separatedly cut into the pole piece with required width; at least two rectangular blank areas are obtained by scraping the edge of the pole piece after cutting, pole ears are welded at the rectangular blank areas, and protective strips are pasted on two sides of each pole ear welded position. The battery pole piece adopts a scraping process, operation is simple, and the process is easy to realize; the pole ears of the prepared pole piece are connected firmly with the current collector, and the stability is good; the thickness of the prepared pole piece is not increased, and the operational feasibility on subsequent winding, welding and other procedures is greatly improved; the prepared battery adopts the multiple pole ears to be directly connected with the current collector, the internal resistance of the battery is reduced, the battery large current output characteristics are realized, the power density of the batterycan be improved in the premise of keeping high capacity of the battery, and the overall performance of the lithium ion battery is facilitated to be improved.
Description
Technical field
The invention belongs to technical field of lithium ion, be specifically related to a kind of lithium ion battery multi pole ears pole piece preparation method, multi-pole lug lithium ion battery pole group preparation method and multi-pole lug lithium ion battery.
Background technology
Along with becoming increasingly conspicuous of energy and environment problem, new-energy automobile has become the focus that each side pays close attention to, and also becomes the direction that of development of automobile industry is new.And lithium-ion-power cell is high due to its energy density, have extended cycle life, the features such as environmental friendliness have become the first-selected power source of new-energy automobile.
Current power automobile industry is also in the initial stage of development, and development electric bus has become the emphasis of new-energy automobile Demonstration And Extension, has especially carried out good demonstration operation in public transport field.But charging interval length has become its obstacle further developing and promote of restriction, therefore the lithium-ion-power cell applied on electric bus needs to improve its high power performance while guarantee capacity, to realize the quick charge of electric bus, long distance running.Want to realize the high-power input of battery, export the internal resistance just needing to reduce battery, realize the high current charge-discharge of battery.
But electrokinetic cell traditional at present, often cause the internal resistance of cell comparatively large when pursuing higher energy density, power-performance is poor, and the charging interval is long; And although the internal resistance of high power type battery is low, its energy density is also lower, and distance travelled is short, or complicated process of preparation, and rate of finished products is low.
Summary of the invention
The object of the invention is to solve above-mentioned technical problem and the lithium ion battery that a kind of lithium ion battery multi pole ears pole piece preparation method, battery pole group preparation method is provided and adopts this battery pole group preparation method to prepare; The preparation method of this pole piece not only can ensure to improve again the power-performance of battery by the capacity of battery, can not only improve the distance travelled of electric automobile but also shorten its each charging interval, and its structure is simply easy to realize, and can improve the rate of finished products of manufacture.
For achieving the above object, the present invention adopts following technical scheme:
A kind of lithium ion battery multi pole ears pole piece preparation method, comprises the steps:
1) gamut even spread active slurry makes pole piece on a current collector;
2) to step 1) pole piece made rolls, and then cuts into the pole piece of required width;
3) in step 2) obtained pole piece edge scrapes at least two rectangle clear areas;
4) in step 3) the rectangle clear area soldering polar ear of obtained pole piece;
5) at the welding position Double-face adhesive boundary belt of described lug.
The present invention also aims to provide a kind of lithium ion cell electrode group preparation method, described battery pole group is formed by positive and negative plate and barrier film winding of being separated by, and described positive plate is adopted and prepared with the following method:
1) gamut even spread active slurry makes pole piece on a current collector;
2) to step 1) positive plate made rolls, and then cuts into the positive plate of required width;
3) in step 2) obtained positive edge, pole scrapes at least two rectangle clear areas;
4) in step 3) the rectangle clear area welding anode ear of obtained positive plate;
5) at the welding position Double-face adhesive boundary belt of anode ear;
Described negative plate preparation method is:
At the initial blank foil leaving uncoated slurry with final position of negative plate winding, at blank foil, negative electrode lug is welded out at place; Or adopt the form coating of continuous coating, to leave some space paper tinsel in the side of coating, described blank foil adopts blunderbuss to cut or laser is cut and prepared negative electrode lug.
The present invention also aims to provide a kind of lithium ion battery, comprise battery pole group, described in described battery pole group, lithium ion cell electrode group preparation method makes.
Multi pole ears vibrational power flow of the present invention is generally used for rectangular lithium ion battery or flexible package, polymer Li-ion battery, more for square lithium ion power battery and flexible package and polymer lithium ion power cell.
The preparation method of lithium ion battery multi pole ears pole piece provided by the invention, adopts gamut to apply, roll, cut, is conducive to the realization of technique; Adopt doctor blade technique to scrape clear area soldering polar ear, improve the effective area of pole piece to a greater extent, improve capacity, ensure that the stability of pole piece and lug; Do not increase the thickness of pole piece on the whole, be conducive to the operation of the techniques such as follow-up winding, assembling.
Battery prepared by the battery pole group adopting above-mentioned pole piece preparation method to prepare, the high power capacity of battery can be kept, and reduce internal resistance, the High-current output of battery can be achieved and temperature rise is less, overall structure is simple, be conducive to the overall performance improving lithium ion battery, for making lithium ion battery, in electric automobile field, application is of great practical significance.
Accompanying drawing explanation
Fig. 1 is that positive plate coating rolls rear schematic diagram;
Fig. 2 is the schematic diagram after positive plate scraping blade provided by the invention;
Fig. 3 is the schematic diagram after positive plate provided by the invention is made;
Fig. 4 is the negative plate schematic diagram of a kind of form provided by the invention;
Fig. 5 is the negative plate schematic diagram of another kind of form provided by the invention
Fig. 6 is battery pole group schematic diagram provided by the invention.
Embodiment
Below, in conjunction with example, substantive distinguishing features of the present invention and advantage are further described, but the present invention is not limited to listed embodiment.
Lithium ion battery multi pole ears pole piece preparation method of the present invention, comprises the steps:
1) gamut even spread active slurry makes pole piece on a current collector;
2) to step 1) pole piece made rolls, and then cuts into the pole piece of required width;
3) in step 2) obtained pole piece edge scrapes at least two rectangle clear areas;
4) in step 3) the rectangle clear area soldering polar ear of obtained pole piece;
5) at the welding position Double-face adhesive boundary belt of described lug.
Preferably, the center of described rectangle clear area is in step 2) 1/4 Along ent of the overall length of obtained pole piece or 3/4 Along ent place.
Preferably, described tab welding reserves a fixed gap with three borders of described rectangle clear area behind described rectangle clear area.
Preferably, described lug adopts and is ultrasonically welded within described rectangle clear area.The stability of welding can be ensured like this, improve the connective stability of battery.
It should be noted that, the width of described rectangle clear area and length will require suitably to adjust according to the afflux of lug number and battery core, are not limited to the above embodiments.To prevent weldering spot from puncturing barrier film and cause security incident in the object of the welding position Double-face adhesive boundary belt of described lug.
Be described to prepare positive plate below, shown in Figure 1, positive plate adopts continuous uniform coating, blank is not left during coating, gamut coating rolls, roll thickness 152 μm, formed and apply the first starting sheet 1 after having rolled as shown in Figure 1, then cut on demand, cutting into needs that width 115mm's cut shaping shaping pole piece 2, the slurry scraping off coating at shaping pole piece 2 assigned address exposes collector, form the clear area 21 not staying slurry of two 10mm*14mm, 22, the exact position of clear area (or being referred to as scraping blade) needs according to pole group width, required afflux, the situations such as heat radiation are carried out calculating and are determined, and need to ensure that all anode ears can overlap, so that with battery cover board welds, as Fig. 2.
At clear area soldering polar ear 3, lug 3 thickness 50-80 μm, adopts 70 μm in this enforcement; Lug 3 width is 8mm, and welding electrode ear area is 8mm*13mm, is equipped with the space of 1mm, sees Fig. 3 on three limits contacted with slurry.
Lug 3 and clear area (i.e. pole piece scraping blade) adopt ultra-sonic welded.At welding position Double-face adhesive protective tapes after welding, protective tapes thickness 30 μm, after taping, thickness is 150 μm, is not more than 152 μm of normal slurry fractions, makes positive plate.
During preparation, pole piece applies in coating slurry time-division section compared to existing technology, the method of reserved clear area on a current collector, the preparation method of lithium ion battery multi pole ears pole piece provided by the invention, adopts gamut to apply, roll, cut, is conducive to the realization of technique; Adopt doctor blade technique to scrape clear area soldering polar ear, improve the effective area of pole piece to a greater extent, improve capacity, obtained pole piece, it is firm that its lug is connected with collector, good stability, be applicable to the environment for use of electrokinetic cell, ensure that the stability of pole piece and lug; Not do not increase the thickness of pole piece on the whole, be conducive to follow-up winding, welding, the technique such as assembling operation.
The present invention also provides a kind of lithium ion cell electrode group preparation method, and described battery pole group is formed by positive and negative plate and barrier film winding of being separated by, and described positive plate is adopted and prepared with the following method:
1) gamut even spread active slurry makes pole piece on a current collector;
2) to step 1) positive plate made rolls, and then cuts into the positive plate of required width;
3) in step 2) obtained positive plate edge scrapes at least two rectangle clear areas;
4) in step 3) the rectangle clear area welding anode ear of obtained positive plate;
5) at the welding position Double-face adhesive boundary belt of anode ear;
Described negative plate preparation method is:
At the initial blank foil leaving uncoated slurry with final position of negative plate winding, at blank foil, negative electrode lug is welded out at place; Or adopt the form coating of continuous coating, to leave some space paper tinsel in the side of coating, described blank foil adopts blunderbuss to cut or laser is cut and prepared negative electrode lug.
Preferably, the center of described rectangle clear area is in step 2) 1/4 Along ent of the overall length of obtained pole piece or 3/4 Along ent place; Described tab welding reserves a fixed gap with three borders of described rectangle clear area behind described rectangle clear area.
Preferably, described anode ear adopts and is ultrasonically welded within described rectangle clear area.
Preferably, the positive and negative lug of described battery pole group is overlapping respectively, or described positive and negative lug is closely side-by-side respectively.
Described positive plate preparation adopts preparation method shown in Fig. 1 ~ 3, and it illustrates the description referring to corresponding above-described embodiment, is no longer described in detail herein.
In specific implementation, during the preparation of described negative plate, can be to reel the initial blank foil leaving uncoated slurry with final position place at negative plate 4, weld out negative electrode lug 5 at blank foil place, as shown in Figure 4; Or adopt the form coating of continuous coating, leave some space in the side of coating pole piece 6 paper tinsel, described blank foil is adopting blunderbuss to cut or laser is cut the method preparing negative electrode lug 51 and formed, namely part is cut in interval on request in the region not applying slurry, the part do not cut is made to form negative negative electrode lug 51, as shown in Figure 5.
On described positive plate, negative plate, the quantity of lug is not limited to the embodiment listed by the present invention, can determine according to actual needs, and negative plate can the negative plate shown in Fig. 4, also can adopt the negative plate shown in Fig. 5.
When adopting the negative plate of the multi pole ears shown in Fig. 5, the power-performance of battery is more superior.
During preparation, pole piece applies in coating slurry time-division section compared to existing technology, on a current collector the method for reserved clear area, and the present invention adopts gamut to apply, roll, cut due to lithium ion battery multi pole ears pole piece, is conducive to the realization of technique; Adopt doctor blade technique to scrape clear area soldering polar ear, improve the effective area of pole piece to a greater extent, improve capacity, ensure that the stability of pole piece and lug; Do not increase the thickness of pole piece on the whole, be conducive to the operation of the techniques such as follow-up winding, assembling.
The present invention also provides a kind of lithium ion battery, comprises battery pole group 7, and described battery pole group adopts described lithium ion cell electrode group preparation method to make.
Because this lithium ion battery adopts above-mentioned pole group preparation method to be prepared, after barrier film is separated by winding, obtain being easy to extensive automation realize, and the lug position of pole piece can not affect the smooth realization of coiling action, winding gained pole group outward appearance is good, after battery pole group prepares, subsequently pole composing type carried out to battery core, pack, enter shell and weld with battery cover board and the operation such as peripheral weld, fluid injection, obtain lithium-ion-power cell.
The multi-pole ear-lithium ion electrokinetic cell that employing said method disclosed by the invention manufactures, its structure adopting multi pole ears and collector to be directly connected, reduce the internal resistance of cell, achieve the High-current output characteristic of battery, the power density of battery is improved under can making to keep the prerequisite of cell high-capacity, be conducive to the overall performance improving lithium ion battery, for making lithium-ion-power cell, in new-energy automobile field, application is of great practical significance.
Compared with the preparation method of existing positive plate, the preparation method of lithium ion battery multi pole ears pole piece provided by the invention, adopts gamut to apply, roll, cut, is conducive to the realization of technique; Adopt doctor blade technique to scrape clear area soldering polar ear, improve the effective area of pole piece to a greater extent, improve capacity, ensure that the stability of pole piece and lug; Do not increase the thickness of pole piece on the whole, be conducive to the operation of the techniques such as follow-up winding, assembling.
Battery prepared by the battery pole group adopting above-mentioned pole piece preparation method to prepare, the high power capacity of battery can be kept, and reduce internal resistance, the High-current output of battery can be achieved and temperature rise is less, overall structure is simple, be conducive to the overall performance improving lithium ion battery, for making lithium ion battery, in electric automobile field, application is of great practical significance.
The above example is only that the preferred embodiment of the present invention is described; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; for the various improvements and modifications of those skilled in the art to technical scheme of the present invention, all should be considered as in protection range that claims of the present invention determines.
Claims (9)
1. a lithium ion battery multi pole ears pole piece preparation method, is characterized in that, comprise the steps:
1) gamut even spread active slurry makes pole piece on a current collector;
2) to step 1) pole piece made rolls, and then cuts into the pole piece of required width;
3) in step 2) obtained pole piece edge scrapes at least two rectangle clear areas;
4) in step 3) the rectangle clear area soldering polar ear of obtained pole piece;
5) at the welding position Double-face adhesive boundary belt of described lug.
2. multi pole ears pole piece preparation method as claimed in claim 1, it is characterized in that, the center of described rectangle clear area is in step 2) 1/4 Along ent of the overall length of obtained pole piece or 3/4 Along ent place.
3. multi pole ears pole piece preparation method as claimed in claim 2, is characterized in that, described tab welding behind described rectangle clear area with three borders of described rectangle clear area a reserved fixed gap.
4. multi pole ears pole piece preparation method as claimed in claim 3, is characterized in that, described lug adopts and is ultrasonically welded within described rectangle clear area.
5. a lithium ion cell electrode group preparation method, described battery pole group is formed by positive and negative plate and barrier film winding of being separated by, and it is characterized in that, described positive plate is adopted and prepared with the following method:
1) gamut even spread active slurry makes pole piece on a current collector;
2) to step 1) positive plate made rolls, and then cuts into the positive plate of required width;
3) in step 2) obtained positive edge, pole scrapes at least two rectangle clear areas;
4) in step 3) the rectangle clear area welding anode ear of obtained positive plate;
5) at the welding position Double-face adhesive boundary belt of anode ear;
Described negative plate preparation method is:
At the initial blank foil leaving uncoated slurry with final position of negative plate winding, at blank foil, negative electrode lug is welded out at place; Or adopt the form coating of continuous coating, to leave some space paper tinsel in the side of coating, described blank foil adopts blunderbuss to cut or laser is cut and prepared negative electrode lug.
6. lithium ion cell electrode group preparation method as claimed in claim 5, it is characterized in that, the center of described rectangle clear area is in step 2) 1/4 Along ent of the overall length of obtained pole piece or 3/4 Along ent place; Described tab welding reserves a fixed gap with three borders of described rectangle clear area behind described rectangle clear area.
7. lithium ion cell electrode group preparation method as claimed in claim 6, is characterized in that, described anode ear adopts and is ultrasonically welded within described rectangle clear area.
8. lithium ion cell electrode group preparation method as claimed in claim 7, is characterized in that, the positive and negative lug of described battery pole group is overlapping respectively, or described positive and negative lug is closely side-by-side respectively.
9. a lithium ion battery, comprises battery pole group, it is characterized in that, described battery pole group adopts lithium ion cell electrode group preparation method described in any one of claim 5 ~ 8 to make.
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| CN201410674212.8A CN104600250A (en) | 2014-11-21 | 2014-11-21 | Preparation method of lithium ion battery multi-pole-ear pole piece, preparation method of pole group and battery |
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| CN201410674212.8A CN104600250A (en) | 2014-11-21 | 2014-11-21 | Preparation method of lithium ion battery multi-pole-ear pole piece, preparation method of pole group and battery |
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Cited By (20)
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| CN106159196A (en) * | 2016-08-29 | 2016-11-23 | 天津力神电池股份有限公司 | Bury lug formula pole piece and lithium ion battery |
| CN106299227A (en) * | 2016-10-14 | 2017-01-04 | 四川赛尔雷新能源科技有限公司 | A kind of pole-piece pole-ear position gumming sticking method |
| CN106450494A (en) * | 2016-08-29 | 2017-02-22 | 天津力神电池股份有限公司 | Preparation method for tab-embedded type electrode plate, electrode plate and lithium ion battery |
| CN106531952A (en) * | 2016-12-19 | 2017-03-22 | 东莞市科睿思美新能源科技有限公司 | Pole piece with tabs |
| CN106602120A (en) * | 2016-12-06 | 2017-04-26 | 惠州亿纬锂能股份有限公司 | Novel structural battery production technology |
| WO2017113999A1 (en) * | 2015-12-29 | 2017-07-06 | 宁德新能源科技有限公司 | Battery having winding structure |
| CN108183264A (en) * | 2017-12-22 | 2018-06-19 | 力神电池（苏州）有限公司 | A kind of preparation method of cylindrical lithium ion battery pole group and its battery pole group |
| CN110137427A (en) * | 2018-02-08 | 2019-08-16 | 中天储能科技有限公司 | The preparation method of multistage battery pole piece |
| CN110692151A (en) * | 2017-06-01 | 2020-01-14 | 株式会社村田制作所 | Method for manufacturing secondary battery |
| CN111740066A (en) * | 2019-03-25 | 2020-10-02 | 宁德新能源科技有限公司 | Pole piece and electrode assembly with same |
| CN112615112A (en) * | 2020-12-07 | 2021-04-06 | 浙江锂威能源科技有限公司 | Preparation method of tab welding slot, preparation method of pole piece and pole piece |
| WO2021227729A1 (en) * | 2020-05-09 | 2021-11-18 | 比亚迪股份有限公司 | Pole piece, wound-type battery cell, and battery |
| CN114006053A (en) * | 2021-10-29 | 2022-02-01 | 蜂巢能源科技有限公司 | Lithium ion battery assembly process and lithium ion battery |
| CN114005956A (en) * | 2021-12-30 | 2022-02-01 | 天津力神电池股份有限公司 | Battery pole piece, preparation method thereof and lithium ion battery |
| CN114975885A (en) * | 2022-06-13 | 2022-08-30 | 惠州锂威新能源科技有限公司 | Preparation method of tab pole piece, battery cell and lithium ion battery |
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| WO2017113999A1 (en) * | 2015-12-29 | 2017-07-06 | 宁德新能源科技有限公司 | Battery having winding structure |
| CN106450494A (en) * | 2016-08-29 | 2017-02-22 | 天津力神电池股份有限公司 | Preparation method for tab-embedded type electrode plate, electrode plate and lithium ion battery |
| CN106159196A (en) * | 2016-08-29 | 2016-11-23 | 天津力神电池股份有限公司 | Bury lug formula pole piece and lithium ion battery |
| CN106450494B (en) * | 2016-08-29 | 2024-02-02 | 天津聚元新能源科技有限公司 | Preparation method of embedded lug type pole piece, pole piece and lithium ion battery |
| CN106299227A (en) * | 2016-10-14 | 2017-01-04 | 四川赛尔雷新能源科技有限公司 | A kind of pole-piece pole-ear position gumming sticking method |
| CN106602120A (en) * | 2016-12-06 | 2017-04-26 | 惠州亿纬锂能股份有限公司 | Novel structural battery production technology |
| CN106531952A (en) * | 2016-12-19 | 2017-03-22 | 东莞市科睿思美新能源科技有限公司 | Pole piece with tabs |
| CN110692151B (en) * | 2017-06-01 | 2022-11-18 | 株式会社村田制作所 | Method for manufacturing secondary battery |
| CN110692151A (en) * | 2017-06-01 | 2020-01-14 | 株式会社村田制作所 | Method for manufacturing secondary battery |
| CN108183264A (en) * | 2017-12-22 | 2018-06-19 | 力神电池（苏州）有限公司 | A kind of preparation method of cylindrical lithium ion battery pole group and its battery pole group |
| CN110137427B (en) * | 2018-02-08 | 2022-03-11 | 中天储能科技有限公司 | Preparation method of multi-stage battery pole piece |
| CN110137427A (en) * | 2018-02-08 | 2019-08-16 | 中天储能科技有限公司 | The preparation method of multistage battery pole piece |
| CN111740066A (en) * | 2019-03-25 | 2020-10-02 | 宁德新能源科技有限公司 | Pole piece and electrode assembly with same |
| CN111740066B (en) * | 2019-03-25 | 2023-05-12 | 宁德新能源科技有限公司 | Pole piece and electrode assembly with same |
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| WO2023102780A1 (en) * | 2021-12-08 | 2023-06-15 | 东莞新能源科技有限公司 | Electrochemical device and electronic device |
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