CN203774398U - Lithium battery and pole core thereof - Google Patents
Lithium battery and pole core thereof Download PDFInfo
- Publication number
- CN203774398U CN203774398U CN201320893290.8U CN201320893290U CN203774398U CN 203774398 U CN203774398 U CN 203774398U CN 201320893290 U CN201320893290 U CN 201320893290U CN 203774398 U CN203774398 U CN 203774398U
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- Prior art keywords
- electrode
- coated
- segment
- active material
- pole piece
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 62
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 238000004804 winding Methods 0.000 claims abstract description 4
- 239000011149 active material Substances 0.000 claims description 107
- 230000004888 barrier function Effects 0.000 claims description 10
- 239000012528 membrane Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 abstract description 12
- 238000000576 coating method Methods 0.000 abstract description 12
- 238000000465 moulding Methods 0.000 abstract description 11
- 239000013543 active substance Substances 0.000 abstract 3
- 239000007774 positive electrode material Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 239000007773 negative electrode material Substances 0.000 description 6
- 239000002033 PVDF binder Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 239000012752 auxiliary agent Substances 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011258 core-shell material Substances 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910032387 LiCoO2 Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002641 lithium Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000011076 safety test Methods 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Battery Electrode And Active Subsutance (AREA)
Abstract
The utility model discloses a lithium battery and a pole core of the lithium battery. The pole core comprises a first electrode, a second electrode and a diaphragm, wherein the first electrode is provided with a first electrode beginning section, and the second electrode is provided with a second electrode beginning section; the first electrode is separated from the second electrode by the diaphragm; the pole core is formed by winding the first electrode, the second electrode and the diaphragm; a part between the first electrode beginning section and the position close to the second electrode beginning section in the innermost ring of the first electrode is a first coating section; a part between the second electrode beginning section and the position close to the first electrode beginning section in the innermost ring of the second electrode is a second coating section; the first coating section is coated with a first active substance; the surface of the second coating section, corresponding to the surface of the first coating section coated with the first active substance, is coated with a second active substance. According to the pole core of the lithium battery, the whole thickness of the battery is consistent, the surface of the battery is flat, the molding thickness is reduced, and the energy density is high.
Description
Technical field
The utility model relates to battery technology field, particularly a kind of pole piece of lithium battery and have the lithium battery of this pole piece.
Background technology
On the electrode of traditional lithium battery, having the white space that does not apply in a large number active material, is that the utilance of electrode is not high, and battery molding thickness is large, and energy density is little, easily causes the cell integrated variable thickness of moulding to cause.
Utility model content
The utility model is intended to solve at least to a certain extent one of above-mentioned technical problem of the prior art.For this reason, an object of the present utility model is to propose a kind of pole piece of lithium battery, and the pole piece of this lithium battery has larger energy density.
Another object of the present utility model is to propose to have the lithium battery of this pole piece.
Pole piece according to lithium battery of the present utility model, comprising: the first electrode, the second electrode and barrier film.Described the first electrode has the first electrode the initial segment, and the part surface of described the first electrode is provided with the first active material, described the second electrode has the second electrode the initial segment, and the part surface of described the second electrode is provided with the second active material, described barrier film interval is between described the first electrode and described the second electrode, described the first electrode, described the second electrode and described membrane coil are coiled into described pole piece, described the first electrode the initial segment is positioned at the innermost circle of described the second electrode away from a side of described the second electrode the initial segment, described the second electrode the initial segment is positioned at the innermost circle of described the first electrode away from a side of described the first electrode the initial segment, in described the first electrode innermost circle, in described the first electrode the initial segment, to the part of closing between described the second electrode the initial segment, be the first coated segment, in described the second electrode innermost circle, in described the second electrode the initial segment, to the part of closing between described the first electrode the initial segment, be the second coated segment, on described the first coated segment, be coated with the first active material, on described the second coated segment, on the surface corresponding with the surface that is coated with the first active material on described the first coated segment, be coated with the second active material.
According to the pole piece of lithium battery of the present utility model, on the first coated segment of the first electrode, be coated with the first active material, and be coated with the second active material on the second coated segment of the second electrode, thus, effectively utilized the first electrode first section, and first section of the second electrode, improved the utilization ratio of the first electrode and second electrode of pole piece innermost circle, pole piece structure of the present utility model can compensate the thickness of lug on pole piece simultaneously, make cell integrated consistency of thickness, battery surface is smooth, thereby good looking appearance and the yields of lithium battery that makes to have this pole piece is high, the molding thickness of lithium battery reduces, energy density is high.
In addition, according to the pole piece of the above-mentioned lithium battery of the utility model, can also there is following additional technical characterictic:
The outer surface one side of described the first coated segment is coated with the first active material, and the outer surface one side of described the second coated segment is coated with the second active material.Thus, with respect to the first coated segment in conventional art and the second coated segment, do not apply the pole piece of active material, this pole piece effectively utilizes pole piece innermost circle, reduced the thickness of pole piece, and promoted the energy density of pole piece, and the lug spot welding position on electrode can move as required, design freedom is larger, is convenient to produce and assembling.
The inner surface of described the first coated segment and outer surface coated on both sides have the first active material, and the inner surface of described the second coated segment and outer surface coated on both sides have the second active material.Thus, further effectively utilized the electrode of the innermost circle of pole piece, the energy that has improved fully pole piece is airtight, and has reduced the thickness of pole piece.
The part that described the first electrode innermost circle is closed on described the second electrode the initial segment is the 3rd coated segment, the part that described the second electrode innermost circle is closed on described the first electrode the initial segment is the 4th coated segment, described the 3rd coated segment outer surface one side is coated with the first active material, and the outer surface one side of described the 4th coated segment is coated with the second active material.Thus, further increase the region that is coated with active material on electrode, thereby further improved the energy density of the lithium battery with this pole piece, be convenient to reduce the volume of lithium battery.
The outmost turns of described the first electrode is the outmost turns of described pole piece, the two sides of described the first electrode part between described the 3rd coated segment and described outmost turns is coated with the first active material, and the two sides that described the second electrode is positioned at the outside winding part of described the 4th coated segment is coated with the second active material.Thus, further improve the energy density of the battery with this pole piece.
The inner surface one side of described pole piece outmost turns is coated with the first active material.Thus, can make full use of electrode, and avoid the waste of active material.
The two sides of described the first electrode the initial segment is uncoated the first active material all, and equal uncoated the second active material in the two sides of the second electrode the initial segment.Thus, be convenient to welding electrode lug in the first electrode the initial segment and the second electrode the initial segment, simplify the moulding process of pole piece, be convenient to the moulding of pole piece, improve shaping efficiency.
Described the first electrode is positive electrode, and described the second electrode is negative electrode.
Described the first electrode is negative electrode, and described the second electrode is positive electrode.
According to lithium battery of the present utility model, comprise according to the pole piece of the aforesaid lithium battery of the utility model.
According to lithium battery of the present utility model, have according to the pole piece of the aforesaid lithium battery of the utility model.Thus, the consistent and surfacing of the integral thickness of lithium battery, thereby make the good looking appearance of lithium battery and yields high, the molding thickness of lithium battery reduces, energy density is high.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of pole piece of the lithium battery of an embodiment of the present utility model.
Fig. 2 is the schematic diagram of pole piece of the lithium battery of another embodiment of the present utility model.
Fig. 3 is the pole piece schematic diagram of traditional lithium battery.
Fig. 4 is the pole piece of the lithium battery with the utility model embodiment of same model and the traditional capacity of lithium battery and contrast schematic diagram of thickness.
Fig. 5 is the pole piece of the lithium battery with the utility model embodiment of same model and the contrast schematic diagram of the energy density of traditional lithium battery.
Reference numeral:
Pole piece 100;
The first electrode 1; The first electrode the initial segment 11; The first coated segment 12; The 3rd coated segment 13; The 5th coated segment 14; The 7th coated segment 15;
The second electrode 2; The second electrode the initial segment 21; The second coated segment 22; The 4th coated segment 23; The 6th coated segment 24;
Barrier film 3;
The first active material 41;
The second active material 42.
Embodiment
Describe embodiment of the present utility model below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.
In description of the present utility model, it will be appreciated that, term " " center ", " longitudinally ", " laterally ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", orientation or the position relationship of indications such as " counterclockwise " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as restriction of the present utility model.
In addition, term " first ", " second " be only for describing object, and can not be interpreted as indication or hint relative importance or the implicit quantity that indicates indicated technical characterictic.Thus, one or more these features can be expressed or impliedly be comprised to the feature that is limited with " first ", " second ".In description of the present utility model, the implication of " a plurality of " is two or more, unless otherwise expressly limited specifically.
In the utility model, unless otherwise clearly defined and limited, the terms such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or be integral; Can be mechanical connection, can be to be also electrically connected to; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements.For the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term in the utility model.
In the utility model, unless otherwise clearly defined and limited, First Characteristic Second Characteristic it " on " or D score can comprise that the first and second features directly contact, also can comprise that the first and second features are not directly contacts but contact by the other feature between them.And, First Characteristic Second Characteristic " on ", " top " and " above " comprise First Characteristic directly over Second Characteristic and oblique upper, or only represent that First Characteristic level height is higher than Second Characteristic.First Characteristic Second Characteristic " under ", " below " and " below " comprise First Characteristic under Second Characteristic and tiltedly, or only represent that First Characteristic level height is less than Second Characteristic.
Describe with reference to the accompanying drawings the pole piece 100 of the lithium battery of the utility model embodiment in detail.
As depicted in figs. 1 and 2, the pole piece 100 according to the lithium battery of the utility model embodiment, comprising: the first electrode 1, the second electrode 2 and barrier film 3.
Particularly, the first electrode 1 has the first electrode the initial segment 11, the part surface of the first electrode 1 is provided with the first active material 41, for form the first electrode one side dressing section, the two-sided dressing section of the first electrode or not dressing section of the first electrode on the first electrode 1.The part surface that the second electrode 2 has the second electrode the initial segment 21, the second electrodes 2 is provided with the second active material 42, for form the second electrode one side dressing section, the two-sided dressing section of the second electrode or not dressing section of the second electrode on the first electrode 1.Barrier film 3 intervals are between the first electrode 1 and the second electrode 2, and the first electrode 1, the second electrode 2 and barrier film 3 are wound into pole piece 100, the first electrodes 1 and outwards reel since the second electrode the initial segment 21, and the second electrode 2 is outwards reeled since the second electrode the initial segment 21.
The first electrode the initial segment 11 is positioned at the innermost circle of the second electrode 2 away from a side of the second electrode the initial segment 21.The second electrode the initial segment 21 is positioned at the innermost circle of the first electrode 1 away from a side of the first electrode the initial segment 11.With reference to Fig. 1, the first electrode the initial segment 11 is positioned at the right side of the second electrode 2 innermost circles, and the second electrode the initial segment 21 is positioned at the left side of the first electrode 1 innermost circle.In the first electrode 1 innermost circle, in the first electrode the initial segment 11, to closing on part between the second electrode the initial segment 21, be in the second electrode the initial segment 21, to the part of closing between the first electrode the initial segment 11, to be the second coated segment 22 in the first coated segment 12, the second electrode 2 innermost circles.
On the first coated segment 12, be coated with on the first active material 41, the second coated segments 22 with the first coated segment 12 on be coated with on the surface of the first active material 41 and be coated with the second active material 42.In other words, on the outer surface of the first coated segment 12, be coated with on the outer surface of the first active material 41 and the second coated segment 22 and be coated with the second active material 42; Or on the inner surface of the first coated segment 12, be coated with on the inner surface of the first active material 41 and the second coated segment 22 and be coated with the second active material 42; Or on the inner surface of the first coated segment 12 and outer surface, be coated with on the outer surface of the first active material 41 and the second coated segment 22 and inner surface and be coated with the second active material 42.
Wherein, the outer surface of described the first coated segment 12 refers to the first surface of coated segment 12 outside pole piece 100, and as shown in Figure 1 or 2, the first coated segment 12 deviates from the surface of described the second electrode the initial segment 21; The inner surface of described the first coated segment 12 refers to the first surface of coated segment 12 in pole piece 100, and as shown in Figure 1 or 2, the first coated segment 12 is towards the surface of the second electrode the initial segment 21.The outer surface of described the second coated segment 22 refers to the second surface of coated segment 22 outside pole piece 100, as shown in Figure 1 or 2, the second coated segment 22 deviates from the surface of the first electrode the initial segment 11, the inner surface of described the second coated segment 22 refers to the second surface of coated segment 22 in pole piece 100, as shown in Figure 1 or 2, the second coated segment 22 is towards the surface of the first electrode the initial segment 11.
According to the pole piece 100 of the lithium battery of the utility model embodiment, on the first coated segment 12 of the first electrode 1, be coated with the first active material 41, and be coated with the second active material 42 on the second coated segment 22 of the second electrode 2, thus, effectively utilized the first electrode 1 first section, and first section of the second electrode 2, the first electrode of pole piece 100 innermost circles and the utilization ratio of the second electrode have been improved, pole piece structure of the present utility model can compensate the thickness of lug on pole piece simultaneously, make cell integrated consistency of thickness, battery surface is smooth, thereby good looking appearance and the yields of lithium battery that makes to have this pole piece is high, the molding thickness of lithium battery reduces, energy density is high.
As shown in Figure 1, in an embodiment of the present utility model, the outer surface one side that the outer surface one side of the first coated segment 12 is coated with the first active material 41, the second coated segments 22 is coated with the second active material 42.In other words, the outer surface of the first coated segment 12 is coated with the first active material 41, and the inner surface of the first coated segment 12 do not apply the upper outside surface-coated of the first active material 41, the second coated segment 22 have the first active material 41 and, the inner surface of the second coated segment 22 does not apply the first active material.Thus, with respect to the first coated segment 12 in conventional art and the second coated segment 22, do not apply the pole piece of active material, this pole piece 100 effectively utilizes pole piece 100 innermost circles, reduced the thickness of pole piece, and promoted the energy density of pole piece 100, and the lug spot welding position on electrode can move as required, design freedom is larger, is convenient to produce and assembling.
Particularly, one of ordinary skill in the art will appreciate that the outer surface of the first coated segment 12 can apply the first active material 41 for part, and the outer surface of the second coated segment 22 also can apply the second active material 42 for part.
As shown in Figure 2, in another embodiment of the present utility model, the inner surface of the first coated segment 12 and outer surface coated on both sides have the inner surface of the first active material 41, the second coated segments 22 and outer surface coated on both sides to have the second active material 42.Particularly, the inner surface of the first coated segment 12 is coated with the first active material 41, and the outer surface of the first coated segment 12 is also coated with the first active material 41, the inner surface of the second coated segment 22 is coated with the second active material 42, and the outer surface of the second coated segment 22 is also coated with the second active material 42.Can also say, on the two sides of the first coated segment 12, all apply the first active material 41, and the two sides of the second coated segment 22 is coated with the second active material 42.Thus, further effectively utilized the electrode of the innermost circle of pole piece 100, the energy that has improved fully pole piece 100 is airtight, and has reduced the thickness of pole piece.
Fig. 3 is the schematic diagram of traditional pole piece, and the two sides of the innermost circle of this pole piece positive electrode does not all apply active material, and the two sides of the innermost circle of this pole piece negative electrode does not all apply active material.
Fig. 4 is the battery and the capacity of battery and the contrast schematic diagram of thickness with traditional pole piece of the pole piece with the utility model embodiment 100 of same model, the contrast schematic diagram of the energy density of the pole piece 100 of the utility model embodiment that Fig. 5 is same model and traditional pole piece.Wherein, old structure is to have the battery of traditional pole piece as shown in Figure 3.The two sides that the two sides of the first coated segment 12 that new construction 1 is pole piece is coated with the first active material 41 and the second coated segment 22 is coated with the battery of the second active material 42, i.e. pole piece as shown in Figure 2.The inner surface one side of the first coated segment 12 that new construction 2 is pole piece is coated with the first active material 41, and the inner surface one side of the second coated segment 22 is coated with the battery of the second active material 42, i.e. pole piece as shown in Figure 1.
According to Fig. 4 and Fig. 5, can it is evident that, pole piece of the present utility model has improved the utilance of electrode effectively, has compensated the thickness of lug on electrode simultaneously, is the cell integrated consistency of thickness with this pole piece, the surfacing of battery, and energy density is large.
The battery of the pole piece with the utility model embodiment that table 1 is same model and the test data with the battery of traditional mechanism pole piece.Wherein, old structure is the battery with traditional pole piece shown in Fig. 3.The two sides that the two sides of the first coated segment 12 that new construction 1 is pole piece is coated with the first active material 41 and the second coated segment 22 is coated with the battery of the second active material 42, i.e. pole piece as shown in Figure 2. the inner surface one side of the first coated segment 12 that new construction 2 is pole piece is coated with the first active material 41, and the inner surface one side of the second coated segment 22 is coated with the battery of the second active material 42, i.e. pole piece as shown in Figure 1.Table 1 as following:
Table 1
As can be seen from Table 1, the pole piece of the lithium battery of the utility model embodiment is with traditional electrode consistent aspect fail safe, and the lithium battery with pole piece 100 of the present utility model too can be by corresponding safety test.
What one of ordinary skill in the art will appreciate that is, can also apply at the inner surface of the first coated segment 12 the first active material 41 and not apply the first active material 41 at the outer surface of the first coated segment 12, accordingly, at the inner surface of the second coated segment 12, apply the first active material 41 and do not apply the second active material 42 at the outer surface of the second coated segment 12.
As depicted in figs. 1 and 2, in an embodiment of the present utility model, the part that the first electrode 1 innermost circle is closed on the second electrode the initial segment 21 is the 3rd coated segment 13, the part that the second electrode 2 innermost circles are closed on the first electrode the initial segment 11 is the 4th coated segment 23, the outer surface one side that the 3rd coated segment 13 outer surface one sides are coated with the first active material 41, the four coated segments 23 is coated with the second active material 42.Particularly, the outer surface of the 3rd coated segment 13 is coated with the first active material 41 on (the 3rd coated segment 13 deviates from the surface of the second electrode the initial segment 21), and the inner surface of the 3rd coated segment 13 does not apply the first active material 41 on (the 3rd coated segment 13 is towards the surface of the second electrode the initial segment 21), the outer surface of the 4th coated segment 23 is coated with the second active material 42 on (the 3rd coated segment 13 deviates from the surface of the first electrode the initial segment 11), and the inner surface of the 4th coated segment 23 does not apply the second active material 42 on (the 3rd coated segment 13 is towards the surface of the first electrode the initial segment 11).Thus, further increase the region that is coated with active material on electrode, thereby further improved the energy density of the lithium battery with this pole piece, be convenient to reduce the volume of lithium battery.
Further, as depicted in figs. 1 and 2, the outmost turns of the first electrode 1 is the outmost turns of pole piece 100, the two sides of the first electrode 1 part between the 3rd coated segment 13 and outmost turns is coated with the two sides that the first active material 41, the second electrodes 2 are positioned at the 4th coated segment 23 outside winding parts and is coated with the second active material 42.Thus, further improve the energy density of the battery with this pole piece 100.
Particularly, the outmost turns of the first electrode 1 is the outmost turns of pole piece 100, the outmost turns of the first electrode 1 is the 7th coated segment 15, and the region in the first electrode 1 between the 3rd coated segment 13 and the 7th coated segment 15 is the 5th coated segment 14, the part that the second electrode 2 continues outwards to reel from the 4th coated segment 23 is the 6th coated segment 24, wherein, the two sides of the 5th coated segment 14 is coated with the first active material 41, and the two sides of the 6th coated segment 24 is coated with the second active material 42.
As depicted in figs. 1 and 2, in an embodiment of the present utility model, the inner surface one side of pole piece 100 outmost turns is coated with the first active material 41.Thus, can make full use of electrode, and avoid the waste of active material.
When the outmost turns of the first electrode 1 is the outmost turns of pole piece 100, the inner surface of the outmost turns of pole piece 100 is coated with the first active material, and in other words, the inner surface of the 7th coated segment 15 is coated with active material.
Further, as depicted in figs. 1 and 2, the two sides of the first electrode the initial segment 11 is uncoated the first active material 41 all, and equal uncoated the second active material 42 in the two sides of the second electrode the initial segment 21.Thus, be convenient to welding electrode lug in the first electrode the initial segment 11 and the second electrode the initial segment 21, simplify the moulding process of pole piece 100, be convenient to the moulding of pole piece 100, improve shaping efficiency.
As shown in Figure 1, in embodiment more of the present utility model, the first electrode 1 is positive electrode, and the second electrode 2 is negative electrode.The first active material is positive active material, and the second active material is negative electrode active material.
In addition, in other embodiment of the present utility model, the first electrode 1 is negative electrode, and the second electrode 2 is positive electrode.The first active material is negative electrode active material, and the second active material is positive active material.
According to the pole piece 100 of the lithium battery of the utility model embodiment, positive electrode comprises plus plate current-collecting body and coating and/or is filled in the positive electrode active materials on plus plate current-collecting body, and plus plate current-collecting body is aluminium foil etc., and the utility model is to not restriction of plus plate current-collecting body.Positive electrode active materials is known to the skilled person, it comprises positive active material and adhesive, and positive active material can be selected from positive active material conventional in lithium ion battery, as LiCoO2 etc., adhesive is also known to the skilled person, as polyvinylidene fluoride (PVDF) etc.In general, the weight ratio that the content of adhesive is positive active material is in 0.01% to 8% scope, and preferred weight ratio is 1% to 5%.Described positive electrode active materials can also comprise anodal auxiliary agent, kind and the content of anodal auxiliary agent are known to the skilled person, anodal auxiliary agent is selected from conductive agent, as at least one in acetylene black, conductive carbon black and electrically conductive graphite, its content is the 0-15% of positive active material weight, is preferably 0-10%.Negative electrode comprises negative current collector and coating and/or is filled in the negative active core-shell material of negative current collector, and negative current collector can be for Copper Foil etc., and the utility model anticathode collector is restriction not.Negative active core-shell material is known to the skilled person, and it comprises negative electrode active material and adhesive, and negative electrode active material can be selected from the negative electrode active material that lithium ion battery is conventional, as native graphite, Delanium etc.Described adhesive is also known to the skilled person, as polyvinylidene fluoride (PVDF), polyvinyl alcohol, butadiene-styrene rubber, sodium carboxymethylcellulose etc., in general, the content of adhesive is the 0.01%-10% of negative electrode active material weight, is preferably 1%-9%.
The manufacturing process of pole piece 100, can adopt first and measure and delimit not coating zone, one side coating zone, dual coating region, not hiding adopts conventional painting method to apply after coating zone, also can adopt conventional whole dual coating, the method of rear employing scraper, wipes the active material that does not need to apply the region of active material off.
What barrier film adopted is various barrier films conventional in lithium ion battery, and as polypropylene mat, polyethylene felt, polyolefin micro porous polyolefin membrane or ultra-fine fibre glass paper etc. well known to a person skilled in the art material, it has electrical insulation capability and liquid retainability energy.
According to the lithium battery of the utility model embodiment, comprise the pole piece 100 according to the lithium battery of the utility model previous embodiment.
According to the lithium battery of the utility model embodiment, have according to the pole piece of the lithium battery of the utility model previous embodiment.Thus, the consistent and surfacing of the integral thickness of lithium battery, thereby make the good looking appearance of lithium battery and yields high, the molding thickness of lithium battery reduces, energy density is high.
According to other formations of the lithium battery of the utility model embodiment and operation, be all known for those of ordinary skills, be not described in detail here.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present utility model or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, to the schematic statement of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can be with suitable mode combinations in any one or more embodiment or example.In addition, those skilled in the art can engage the different embodiment that describe in this specification or example and combine.
Although illustrated and described embodiment of the present utility model above, be understandable that, above-described embodiment is exemplary, can not be interpreted as restriction of the present utility model, those of ordinary skill in the art can change above-described embodiment in scope of the present utility model, modification, replacement and modification.
Claims (10)
1. a pole piece for lithium battery, is characterized in that, comprising:
The first electrode, described the first electrode has the first electrode the initial segment, and the part surface of described the first electrode is provided with the first active material;
The second electrode, described the second electrode has the second electrode the initial segment, and the part surface of described the second electrode is provided with the second active material;
Barrier film, described barrier film interval is between described the first electrode and described the second electrode, and described the first electrode, described the second electrode and described membrane coil are coiled into described pole piece,
Described the first electrode the initial segment is positioned at the innermost circle of described the second electrode away from a side of described the second electrode the initial segment, described the second electrode the initial segment is positioned at the innermost circle of described the first electrode away from a side of described the first electrode the initial segment, in described the first electrode innermost circle, in described the first electrode the initial segment, to the part of closing between described the second electrode the initial segment, be the first coated segment, in described the second electrode innermost circle, in described the second electrode the initial segment, to the part of closing between described the first electrode the initial segment, be the second coated segment, on described the first coated segment, be coated with the first active material, on described the second coated segment, on the surface corresponding with the surface that is coated with the first active material on described the first coated segment, be coated with the second active material.
2. the pole piece of lithium battery according to claim 1, is characterized in that, the outer surface one side of described the first coated segment is coated with the first active material, and the outer surface one side of described the second coated segment is coated with the second active material.
3. the pole piece of lithium battery according to claim 1, is characterized in that, the inner surface of described the first coated segment and outer surface coated on both sides have the first active material, and the inner surface of described the second coated segment and outer surface coated on both sides have the second active material.
4. according to the pole piece of the lithium battery described in any one in claim 1-3, it is characterized in that, the part that described the first electrode innermost circle is closed on described the second electrode the initial segment is the 3rd coated segment, the part that described the second electrode innermost circle is closed on described the first electrode the initial segment is the 4th coated segment, described the 3rd coated segment outer surface one side is coated with the first active material, and the outer surface one side of described the 4th coated segment is coated with the second active material.
5. the pole piece of lithium battery according to claim 4, it is characterized in that, the outmost turns of described the first electrode is the outmost turns of described pole piece, the two sides of described the first electrode part between described the 3rd coated segment and described outmost turns is coated with the first active material, and the two sides that described the second electrode is positioned at the outside winding part of described the 4th coated segment is coated with the second active material.
6. the pole piece of lithium battery according to claim 5, is characterized in that, the inner surface one side of described pole piece outmost turns is coated with the first active material.
7. the pole piece of lithium battery according to claim 1, is characterized in that, the two sides of described the first electrode the initial segment is uncoated the first active material all, and equal uncoated the second active material in the two sides of the second electrode the initial segment.
8. according to the pole piece of the lithium battery described in any one in claim 1-3 and 5-7, it is characterized in that, described the first electrode is positive electrode, and described the second electrode is negative electrode.
9. according to the pole piece of the lithium battery described in any one in claim 1-3 and 5-7, it is characterized in that, described the first electrode is negative electrode, and described the second electrode is positive electrode.
10. a lithium battery, is characterized in that, comprises according to the pole piece of the lithium battery described in any one in claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320893290.8U CN203774398U (en) | 2013-12-31 | 2013-12-31 | Lithium battery and pole core thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320893290.8U CN203774398U (en) | 2013-12-31 | 2013-12-31 | Lithium battery and pole core thereof |
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| CN203774398U true CN203774398U (en) | 2014-08-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021174418A1 (en) * | 2020-03-03 | 2021-09-10 | 宁德新能源科技有限公司 | Battery |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021174418A1 (en) * | 2020-03-03 | 2021-09-10 | 宁德新能源科技有限公司 | Battery |
| JP2022525489A (en) * | 2020-03-03 | 2022-05-17 | 寧徳新能源科技有限公司 | battery |
| JP7101873B2 (en) | 2020-03-03 | 2022-07-15 | 寧徳新能源科技有限公司 | battery |
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