CN103165901A - Pole piece substrate and pole piece of lithium battery, and preparation method thereof - Google Patents
Pole piece substrate and pole piece of lithium battery, and preparation method thereof Download PDFInfo
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- CN103165901A CN103165901A CN2011104213357A CN201110421335A CN103165901A CN 103165901 A CN103165901 A CN 103165901A CN 2011104213357 A CN2011104213357 A CN 2011104213357A CN 201110421335 A CN201110421335 A CN 201110421335A CN 103165901 A CN103165901 A CN 103165901A
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- pole piece
- lithium battery
- substrate
- battery pole
- pole plate
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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
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Abstract
The invention relates to a pole piece substrate and a pole piece of a lithium battery and a preparation method thereof. The pole piece of the lithium battery comprises the pole piece substrate of the lithium battery and pole piece slurry coated on two side surfaces of the pole piece substrate of the lithium battery. The pole piece substrate of the lithium battery comprises a substrate main body; a plurality of through holes perforated through machining molding and penetrating two side surfaces of the substrate main body are arranged in the substrate main body; the pole piece slurry coated at the two side surfaces of the pole piece substrate contact and break over through the through holes, so permeability of the pole piece substrate is improved, and volatility of the pole piece slurry is improved, thereby enabling capacity to be increased by 20 to 40%. According to the invention, because of arrangement of the through holes, quantity of the pole piece slurry accommodated in a unit volume is increased; i.e., more pole piece slurry is accommodated in the case that the length of the pole piece substrate is not changed, or the length of the pole piece substrate for accommodation of a same amount of the pole piece slurry is shortened, so the usage amount of a diaphragm and the pole piece substrate is reduced, waste can be substantially reduced, and production cost is greatly lowered down.
Description
Technical field
The present invention relates to lithium battery, more particularly, the preparation method who relates to a kind of lithium battery pole plate substrate, uses the pole piece of this lithium battery pole plate substrate and prepare this lithium battery pole plate substrate and pole piece.
Background technology
Along with the development of the electric consumers such as mobile phone, notebook computer, digital camera, Digital Video and power vehicle, electric tool, Moped Scooter, generating and energy storage device equal energy source power product, the application of lithium battery is also more and more extensive.Particularly portable electronic market is progressively ripe, and compact lithium cell will tend towards stability future, and under the trend that power source develops rapidly, dynamic lithium battery is just welcoming explosive the growth.
The pole piece of present lithium battery comprises negative plate and positive plate, and it is mainly that the pole piece slurry is coated on pole piece base material (being collector), by the preparation moulding such as rolling, dry, cut.Present pole piece base material normally adopts optical aluminum foil, light Copper Foil etc., and the pole piece slurry directly is coated in its surface.So just make the pole piece slurry of pole piece base material both side surface be separated by the pole piece base material fully, thereby cause the permeability etc. of pole piece slurry to be affected, reduced the volumetric properties performance of pole piece slurry.
And, due to lithium battery, power lithium battery particularly, its pole piece is very thin, and single face thickness is between 40-60um, and two-sided thickness adds the thickness of superior pole piece base material just between 100-120um, the pole piece slurry of prior art separately in the both side surface of pole piece base material, works alone respectively.And because pole piece is thinner, when the pole piece slurry of both sides tiles, to the coating required precision very high, otherwise be easy to because of the coating uneven thickness, as shown in Figure 6, the particle 2 of pole piece slurry is probably between 1-20um, when crawling, be easy to assemble simultaneously at the pole piece slurry of pole piece base material 1 both sides more or less, cause local microdefect, there is potential safety hazard, short circuit, the defective such as on fire occur.
In addition, the performance of lithium battery capacity, performance etc., what mainly rely on is the quantity of pole piece slurry, because the pole piece base material adopts light Copper Foil, optical aluminum foil, taken the space of pole piece slurry, make the pole piece slurry in unit volume reduce, thereby reduced the capacity of lithium battery etc., perhaps, increase the volume of lithium battery, and affected the application of lithium battery.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of lithium battery pole plate substrate and lithium battery pole slice that increases the lithium battery permeability is provided.
Another technical problem that the present invention will solve is, a kind of lithium battery pole plate substrate preparation method and lithium battery pole piece preparation method that increases the lithium battery permeability is provided.
The technical solution adopted for the present invention to solve the technical problems is: a kind of lithium battery pole plate substrate is provided, comprises substrate body, described substrate body is provided with the some through holes by machine work moulding, the described substrate body both side surface of perforation.
In lithium battery pole plate substrate of the present invention, described substrate body is Copper Foil or aluminium foil, is positive-pole base material main body or base material of cathode main body.
In lithium battery pole plate substrate of the present invention, described through hole is evenly distributed on described substrate body; The cross sectional shape of described through hole is circle, ellipse, prismatic, triangle, polygon or irregular shape.
In lithium battery pole plate substrate of the present invention, the sectional area of each described through hole is 50um
2-5mm
2, the thickness of described substrate body is 5um-0.2mm, its pore-creating rate is 15%-70%.
The present invention also provides a kind of lithium electricity battery pole piece, the pole piece slurry that comprises the lithium battery pole plate substrate and be coated in described lithium battery pole plate substrate both side surface; It is characterized in that, described lithium battery pole plate substrate is the described lithium battery pole plate substrate of above-mentioned any one; Be coated in the pole piece slurry of described lithium battery pole plate substrate both side surface by described through hole contact conducting.
In lithium electricity battery pole piece of the present invention, the particle size of described pole piece slurry is less than the area of section of described through hole; Described pole piece slurry comprises utmost point powder and binding agent.
The present invention also provides a kind of lithium battery pole plate substrate preparation method, comprises the following steps:
S1: preparation substrate body;
S2: adopt machining mode to prepare some through holes on described substrate body, described through hole runs through described substrate body both side surface.
In lithium battery pole plate substrate preparation method of the present invention, in described step S2, draw in the net by punching processing, Blanking punching or Blanking, go out some through holes on described substrate body; The cross sectional shape of described through hole is circle, ellipse, prismatic, triangle, polygon or irregular shape; The sectional area of described through hole is 50um
2-5mm
2, the thickness of described substrate body is 5um-0.2mm, its pore-creating rate is 15%-70%.
In lithium battery pole plate substrate preparation method of the present invention, the method also comprises step S3: will carry out attenuate processing through the described substrate body that step S2 prepares some through holes.
The present invention also provides a kind of lithium battery pole piece preparation method, comprises the following steps: A1: adopt above-mentioned preparation method to prepare the lithium battery pole plate substrate;
A2: preparation pole piece slurry, mix utmost point powder with binding agent;
A3: the described pole piece slurry of steps A 2 preparations is coated in the both side surface of the described lithium battery pole plate substrate of steps A 1 preparation, and the pole piece slurry of both side surface is by described through hole contact conducting.
Implement the present invention and have following beneficial effect: by process some through holes on substrate body, thereby make the pole piece slurry that is coated in the substrate body both side surface to contact by through hole, improved the permeability of pole piece base material, strengthen the volatility of pole piece slurry, thereby can the performance of help capacity improve 20%-40%; And, because the pole piece slurry of both side surface is the contact conducting, no longer work alone, but be in the collaborative work state, mutually make up, mutually replenish, can avoid short circuit, the defective such as on fire, improved the fail safe of battery.
In addition, setting due to through hole, make the quantity of the pole piece slurry that holds in unit volume increase, that is to say in the situation that do not change pole piece base material length and can hold more pole piece slurry, perhaps, the needed pole piece base material of pole piece slurry that holds same amount can shorten, thereby can reduce the consumption of barrier film, pole piece base material, greatly reduce waste, and greatly reduced production cost.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in accompanying drawing:
Fig. 1 is the partial schematic diagram of an embodiment of lithium battery pole plate substrate of the present invention;
Fig. 2 is the staggered partial schematic diagram of the through hole of Fig. 1;
Fig. 3 is the partial schematic diagram of the another kind of form through hole of employing of lithium battery pole plate substrate of the present invention;
Fig. 4 is the staggered partial schematic diagram of the through hole of Fig. 3;
Fig. 5 is the local enlarged diagram of lithium battery pole slice of the present invention;
Fig. 6 is the local enlarged diagram of the lithium battery pole slice of prior art.
Embodiment
As shown in Figure 1, be an embodiment of lithium battery pole plate substrate of the present invention, can apply the pole piece slurry in the both side surface of lithium battery pole plate substrate, and form lithium battery pole slice.Understandable, this lithium battery pole plate substrate can be used as the base material of positive plate or negative plate, selects different pole piece slurries can produce positive plate or negative plate.
In the present embodiment, the lithium battery pole plate substrate comprises substrate body 11, and this substrate body 11 can be selected Copper Foil or aluminium foil, can be made into as required positive-pole base material main body 11 or base material of cathode main body 11.The thickness of the substrate body 11 after moulding is 5um-0.5mm, and preferred, its thickness is 8-16um, can select as requested different thickness.
Make some through holes 12 by machine work on substrate body 11, these through holes 12 connect substrate body 11 both side surface, its pore-creating rate is that 15%-70%(is certain, can adjust as required density), make the pole piece slurry that is coated in substrate body 11 both side surface to contact conductings by through hole 12, thereby improved the permeability of pole piece base material, increased the volatility of pole piece slurry, can help battery capacity to improve 20%-40%.And, due to the setting of through hole 12, reduced the use of the material of substrate body 11, saved cost.
In the present embodiment, these through holes 12 are manhole 12, are evenly distributed on substrate body 11 by punch forming, and its aperture is between 10um-2mm, and preferred, its aperture is 1mm.The arrangement of these through holes 12 can (as shown in Figure 1) arranged into an array, also can staggered (as shown in Figure 2).Understandable, the shape of these through holes 12 can also be other shapes, for example ellipse, prismatic (as shown in Fig. 3,4), triangle, polygon, irregular shape or other shapes, and the area of section of each through hole 12 is about 50um
2-5mm
2, and the pole piece slurry comprises utmost point powder, binding agent etc., between 5um-20um, less than the area of section of through hole 12, thereby the through hole 12 that passes through of being convenient to the pole piece slurry of both sides contacts conductings to the size of its pole piece pulp particle 13 greatly.
The setting of the present embodiment by through hole 12 can be so that hold more pole piece slurry in unit volume, thereby can shorten substrate body 11, reduces the material usage of substrate body 11, thereby reduce the use of barrier film; Even, can also be by increasing the thickness of substrate body 11, increase unit volume the pole piece slurry hold quantity, thereby further shorten the length of substrate body 11, reduce the consumption of barrier film; Perhaps, keep the length of substrate body 11, obtain more jumbo lithium battery, thereby realize the miniaturization of high power capacity dynamic lithium battery.
When preparation lithium battery pole slice of the present invention, at first need to prepare the lithium battery pole plate substrate.For the preparation of lithium battery pole plate substrate, at first, preparation substrate body 11 that is to say to process Copper Foil or the substrate body 11 such as aluminium foil of thickness between 0.5um-1mm; Then, adopt machining mode to prepare some through holes 12 on substrate body 11, make through hole 12 run through substrate body 11 both side surface.In the present embodiment, by punching technology, go out equally distributed some through holes 12 on substrate body 11.Certainly, can also by techniques such as Blanking punching, Blanking draw in the net, process continuously equally distributed through hole 12 on the pole piece base material.
Understandable, after the through hole 12 of completing substrate body 11 is made, need that also substrate body 11 is carried out cleaning surfaces and process, make in order to follow-up lithium battery pole slice.
Further, in the present embodiment, for the ease of the processing of the through hole 12 of pole piece base material, adopt thicker pole piece substrate body, as the pole piece substrate body of thickness 20um, carry out the machine work of through hole.After through-hole machine machines, then substrate body is carried out carrying out attenuate processing by the mode such as roll, make the substrate body attenuation become 5-10um, to satisfy the thickness requirement of battery pole piece.Certainly, the thickness of the pole piece base material that can obtain according to last needs selects thicker substrate body to carry out the machine work of through hole.The method has avoided that the thickness because of substrate body is too thin can't carry out mach defective.
Carry out lithium battery pole slice when preparing, except preparation substrate body 11, also needing to prepare the pole piece slurry, utmost point powder is being mixed with binding agent, preparing the pole piece slurry; Certainly, utmost point powder and binding agent can be selected according to making anode pole piece or cathode pole piece, and particle 13 sizes of the pole piece slurry of making are approximately 5-20um, less than the area of section of through hole 12.
Then, the pole piece slurry for preparing is coated in the both side surface of lithium battery pole plate substrate, makes the pole piece slurry of both side surface by through hole 12 contact conductings.Because the pole piece substrate body is provided with through hole, thereby the coating of pole piece slurry needs only controls integral thickness, and need not to consider the thickness of single face, greatly reduces the technological requirement of coating, has improved production efficiency.And, because the particle 13 of the pole piece slurry on substrate body two sides joins by through hole, as shown in Figure 5, no longer work alone, but be in the collaborative work state, mutually make up, mutually replenish, can avoid short circuit, the defective such as on fire, improve the fail safe of battery.
Certainly, after the coating of completing the pole piece slurry, also need to complete the making of inner battery pole piece through steps such as drying, cut.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improve and conversion all should belong to the protection range of claims of the present invention.
Claims (10)
1. a lithium battery pole plate substrate, comprise substrate body, it is characterized in that, described substrate body is provided with the some through holes by machine work moulding, the described substrate body both side surface of perforation.
2. lithium battery pole plate substrate according to claim 1, is characterized in that, described substrate body is Copper Foil or aluminium foil, is positive-pole base material main body or base material of cathode main body.
3. lithium battery pole plate substrate according to claim 1, is characterized in that, described through hole is evenly distributed on described substrate body; The cross sectional shape of described through hole is circle, ellipse, prismatic, triangle, polygon or irregular shape.
4. lithium battery pole plate substrate according to claim 1, is characterized in that, the sectional area of each described through hole is 50um
2-5mm
2, the thickness of described substrate body is 5um-0.2mm, its pore-creating rate is 15%-70%.
5. lithium electricity battery pole piece, the pole piece slurry that comprises the lithium battery pole plate substrate and be coated in described lithium battery pole plate substrate both side surface; It is characterized in that, described lithium battery pole plate substrate is the described lithium battery pole plate substrate of the claims 1-4 any one; Be coated in the pole piece slurry of described lithium battery pole plate substrate both side surface by described through hole contact conducting.
6. lithium electricity battery pole piece according to claim 5, is characterized in that, the particle size of described pole piece slurry is less than the area of section of described through hole; Described pole piece slurry comprises utmost point powder and binding agent.
7. a lithium battery pole plate substrate preparation method, is characterized in that, comprises the following steps:
S1: preparation substrate body;
S2: adopt machining mode to prepare some through holes on described substrate body, described through hole runs through described substrate body both side surface.
8. lithium battery pole plate substrate preparation method according to claim 7, is characterized in that, in described step S2, draws in the net by punching processing, Blanking punching or Blanking, goes out some through holes on described substrate body; The cross sectional shape of described through hole is circle, ellipse, prismatic, triangle, polygon or irregular shape; The sectional area of described through hole is 50um
2-5mm
2, the thickness of described substrate body is 5um-0.2mm, its pore-creating rate is 15%-70%.
9. lithium battery pole plate substrate preparation method according to claim 7, is characterized in that, the method also comprises step S3: will carry out attenuate processing through the described substrate body that step S2 prepares some through holes.
10. a lithium battery pole piece preparation method, is characterized in that, comprises the following steps: A1: adopt claim 7,8 or 9 preparation method to prepare the lithium battery pole plate substrate;
A2: preparation pole piece slurry, mix utmost point powder with binding agent;
A3: the described pole piece slurry of steps A 2 preparations is coated in the both side surface of the described lithium battery pole plate substrate of steps A 1 preparation, and the pole piece slurry of both side surface is by described through hole contact conducting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104213357A CN103165901A (en) | 2011-12-15 | 2011-12-15 | Pole piece substrate and pole piece of lithium battery, and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104213357A CN103165901A (en) | 2011-12-15 | 2011-12-15 | Pole piece substrate and pole piece of lithium battery, and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN103165901A true CN103165901A (en) | 2013-06-19 |
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|---|---|---|---|
| CN2011104213357A Pending CN103165901A (en) | 2011-12-15 | 2011-12-15 | Pole piece substrate and pole piece of lithium battery, and preparation method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393335A (en) * | 2014-12-10 | 2015-03-04 | 深圳市三讯电子有限公司 | Lithium ion battery and manufacturing method thereof |
| CN105322130A (en) * | 2014-07-28 | 2016-02-10 | 微宏动力系统（湖州）有限公司 | Electrode sheet and manufacturing method thereof |
| CN105870491A (en) * | 2016-04-15 | 2016-08-17 | 辉能（天津）科技发展有限公司 | Lithium ion battery adopting porous conductive base material and capable of preventing pole piece from being crimped in lamination |
| CN106654289A (en) * | 2016-12-29 | 2017-05-10 | 深圳先进技术研究院 | Porous aluminum-foil cathode, preparation method of porous aluminum-foil cathode and lithium secondary battery |
| CN106848272A (en) * | 2016-12-29 | 2017-06-13 | 深圳先进技术研究院 | A kind of porous tinfoil paper negative pole and preparation method thereof and sodium ion secondary battery |
| CN107394209A (en) * | 2017-07-07 | 2017-11-24 | 郑州比克电池有限公司 | A kind of based lithium-ion battery positive plate and its manufacture method |
| CN109065838A (en) * | 2018-08-16 | 2018-12-21 | 薛树超 | A kind of manganese lithium battery raw powder's production technology of combination porous metals piece |
| CN109119681A (en) * | 2018-09-14 | 2019-01-01 | 中航锂电技术研究院有限公司 | A kind of highly secure lithium ion battery |
-
2011
- 2011-12-15 CN CN2011104213357A patent/CN103165901A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105322130A (en) * | 2014-07-28 | 2016-02-10 | 微宏动力系统（湖州）有限公司 | Electrode sheet and manufacturing method thereof |
| CN104393335A (en) * | 2014-12-10 | 2015-03-04 | 深圳市三讯电子有限公司 | Lithium ion battery and manufacturing method thereof |
| CN105870491A (en) * | 2016-04-15 | 2016-08-17 | 辉能（天津）科技发展有限公司 | Lithium ion battery adopting porous conductive base material and capable of preventing pole piece from being crimped in lamination |
| CN106654289A (en) * | 2016-12-29 | 2017-05-10 | 深圳先进技术研究院 | Porous aluminum-foil cathode, preparation method of porous aluminum-foil cathode and lithium secondary battery |
| CN106848272A (en) * | 2016-12-29 | 2017-06-13 | 深圳先进技术研究院 | A kind of porous tinfoil paper negative pole and preparation method thereof and sodium ion secondary battery |
| CN106848272B (en) * | 2016-12-29 | 2020-04-21 | 深圳中科瑞能实业有限公司 | Porous tin foil cathode, preparation method thereof and sodium ion secondary battery |
| CN107394209A (en) * | 2017-07-07 | 2017-11-24 | 郑州比克电池有限公司 | A kind of based lithium-ion battery positive plate and its manufacture method |
| CN109065838A (en) * | 2018-08-16 | 2018-12-21 | 薛树超 | A kind of manganese lithium battery raw powder's production technology of combination porous metals piece |
| CN109119681A (en) * | 2018-09-14 | 2019-01-01 | 中航锂电技术研究院有限公司 | A kind of highly secure lithium ion battery |
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Application publication date: 20130619 |