CN216624342U - Positive current collector, roll core and battery - Google Patents
Positive current collector, roll core and battery Download PDFInfo
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- CN216624342U CN216624342U CN202123240204.7U CN202123240204U CN216624342U CN 216624342 U CN216624342 U CN 216624342U CN 202123240204 U CN202123240204 U CN 202123240204U CN 216624342 U CN216624342 U CN 216624342U
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model relates to the technical field of batteries, and particularly discloses a positive current collector, a roll core and a battery. According to the positive current collector, the winding core and the battery, the through hole structure and the concave-convex structure are creatively arranged, when the battery core is manufactured, the current collector can be wound, after the winding is finished, the concave-convex structure and the through hole structure of the coating area enable the interior of the winding core to achieve a better loosening effect, meanwhile, the empty foil area can be flattened after the winding to form the full tab area, the full tab area can be loosened by arranging the through holes in the empty foil, the structural arrangement is beneficial to the infiltration of electrolyte, and the method is simple to operate and suitable for industrial production popularization.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a positive current collector, a winding core and a battery.
Background
Lithium ion batteries are widely applied to various fields in human production and life because of the advantages of high energy density, good rate performance, high voltage, no memory effect, long cycle life and the like, and at present, small-capacity cylindrical lithium ion batteries have great advantages in modularization and standardization of system development because of high production automation degree, good stability and high replaceability, and are cylindrical batteries with the widest application range at present. However, the capacity of a single small-capacity cylindrical lithium ion battery is low and generally in the range of 2-4Ah, a battery pack can be assembled by connecting a plurality of batteries in series and in parallel to meet the application scene of high-capacity demand, the battery management system of the battery pack is relatively complex, and the internal battery core is unevenly heated and is easy to cause potential safety hazards, so that the capacity of the single battery core is very necessary to be improved. The capacity of the small cylindrical battery is generally improved by two methods, one is to improve the winding number of the pole pieces, the other is to widen the width of the positive pole piece and the negative pole piece, and the size of the battery is larger than that of the small cylindrical battery, so the battery is called a large-capacity cylindrical battery, and is called a large cylindrical battery for short. The performance of the large cylindrical battery is obviously improved compared with the small capacity, and the large cylindrical battery is mainly embodied in four aspects: 1) the space utilization rate is high, and the actual space utilization rate is increased because the size of the cylinder is large and the number of the monomers is small; 2) the cost is reduced, the requirements on the aspects of a battery management system and the like are reduced, the use and production processes of a structural member are reduced, and the cost is reduced; 3) the safety is high, the battery adopts a full-lug or lug-free mode, the resistance is extremely low, no concentrated heating points are arranged in the battery, and the heating is uniform; 4) the performance is obviously improved, such as capacity and quick charging performance.
Compared with the common small cylindrical battery, the large cylindrical battery has great advantages, but the defects are obvious, the large cylindrical battery is not popularized and applied on a large scale at present, and the problem of electrolyte infiltration of the large cylindrical battery is particularly prominent. Big cylinder battery pole piece is long again wide, and the number of turns of convoluteing must increase, and it is more compact after rubbing flat operation to roll up a core both ends in addition, is unfavorable for the inside roll core of battery to soak electrolyte more, and the battery pole piece soaks and just appears educing the lithium phenomenon incompletely easily, causes the growth of lithium crystal branch, impales the barrier film, leads to the battery monomer short circuit, causes the battery thermal runaway.
Therefore, the conventional method in the market at present is to provide a plurality of through holes on the current collector to facilitate the infiltration of the electrolyte, such as: the Chinese patent with publication number CN104036968A adopts the through holes arranged on the current collector, which can shorten the electrolyte infiltration path of the electrolyte in the direction vertical to the axial direction of the battery cell, effectively improve the liquid injection efficiency, but the excessive holes are punched on the whole pole piece to reduce the upper limit of the tension born by the pole piece, and the pole piece foil is easy to break; the Chinese patent with publication number CN211376807U sets a concave-convex structure in the kneading and flattening area, but the operation is complicated, the electrolyte diffusion path in the winding core is long, and the electrolyte infiltration is not facilitated; the Chinese patent with publication number CN112820882A is provided with a concave-convex groove, and the surface of a rolled pole piece forms a concave-convex structure to solve the problem of difficult liquid injection and low efficiency, but the electrolyte diffusion path inside the inner roll core is long, and the electrolyte infiltration is not facilitated.
SUMMERY OF THE UTILITY MODEL
Aiming at the technical problems in the prior art, one of the purposes of the utility model is to provide a positive current collector structure which can effectively improve the difficulty in infiltrating a large cylindrical roll core structure and is beneficial to infiltrating electrolyte
The second purpose of the utility model is to provide a winding core.
It is a further object of the present invention to provide a battery.
The technical scheme for solving the technical problems is as follows:
the utility model provides a positive pole mass flow body, includes anodal empty paper tinsel district and anodal coating district, anodal empty paper tinsel district and anodal coating district all are provided with anodal through-hole, anodal coating district still is provided with anodal concave structure and/or anodal convex structure.
Further, the positive electrode concave structure or the positive electrode convex structure is formed by rolling; further preferably, the positive electrode concave structure or the positive electrode convex structure is a strip.
Further, the positive electrode concave structure and the positive electrode convex structure are arranged along the current collector winding direction.
Further, the positive electrode concave structure and the positive electrode convex structure are arranged at intervals, and preferably, a positive electrode through hole is arranged between the positive electrode concave structure and the positive electrode convex structure.
Further, the length of the positive electrode concave structure or the positive electrode convex structure is less than the length of the current collector coating area along the winding direction; the width of the positive electrode concave structure or the positive electrode convex structure is 1/10-1/11 of the width of the current collector coating area; the depth of the positive electrode concave structure or the positive electrode convex structure is 0.5-1 mm.
Further, the shape of the positive through hole is one or more of a circle, a square and a triangle; preferably, the shape of the positive through hole is circular, and burrs of the circular structure are few, so that the risk of short circuit of the positive electrode and the negative electrode can be reduced; more preferably, the diameter of the circle is 2-4 mm.
The utility model also discloses a winding core, which comprises a positive plate, a diaphragm and a negative plate which are sequentially stacked and wound;
the positive plate comprises the positive current collector and a positive coating, and the positive coating is coated on the surface of a positive coating area of the positive current collector;
the negative pole piece includes negative pole mass flow body and negative coating, the negative pole mass flow body includes the empty paper tinsel district of negative pole and negative coating district, the surface in negative coating district is coated to the negative coating, just negative coating is just to setting up with anodal coating.
The negative electrode empty foil area is provided with a negative electrode through hole, and the negative electrode coating area is provided with a negative electrode concave structure and/or a negative electrode convex structure.
Further, the negative electrode concave structure and the negative electrode convex structure are arranged along the current collector winding direction.
Further, the length of the negative electrode concave structure or the negative electrode convex structure is less than the length of the current collector coating area along the winding direction; the width of the negative electrode concave structure or the negative electrode convex structure is 1/10-1/11 of the width of the current collector coating area; the depth of the negative electrode concave structure or the negative electrode convex structure is 0.5-1 mm.
Further, the negative electrode concave structure and the negative electrode convex structure are arranged at intervals, and preferably, a negative electrode through hole is arranged between the negative electrode concave structure and the negative electrode convex structure.
Further, the shape of the negative through hole is one or more of a circle, a square and a triangle; the shape of the negative through hole is preferably circular, and burrs of the circular structure are few, so that the risk of short circuit of the positive electrode and the negative electrode can be reduced; more preferably, the diameter of the circle is 2-4 mm.
Furthermore, negative pole concave structure and negative pole convex structure on the negative pole piece with positive pole convex structure and the setting of staggering relatively of positive pole concave structure on the positive pole piece can make roll up the inside better loose effect that reaches of core.
The utility model also discloses a battery comprising the winding core structure.
Compared with the prior art, the technical scheme of the application has the following beneficial technical effects:
(1) the positive current collector is creatively provided with the through hole structure and the concave-convex structure, when a battery core is manufactured, the positive current collector is wound, after the winding is finished, the concave-convex structure and the through hole structure of the coating area enable the inside of the winding core to achieve a better loosening effect, meanwhile, the empty foil area is flattened after the winding to form a full tab area, the through hole is formed in the empty foil of the positive electrode, the full tab area is loosened, the structural arrangement is beneficial to the infiltration of electrolyte, and the method is simple to operate and suitable for industrial production popularization.
(2) In the roll core, the negative current collector is structurally innovated, the through hole is arranged in the empty foil area, and compared with the positive current collector, the coating area of the negative current collector is not provided with a through hole structure, so that the upper limit of the tension of a pole piece after punching is not reduced, and the concave-convex structure arranged in the coating area also shortens an electrolyte infiltration path of electrolyte in the direction vertical to the axial direction of the battery cell, thereby effectively improving the problem of difficult infiltration of the large-cylinder roll core structure, improving the liquid injection efficiency and improving the yield of large-cylinder batteries.
Drawings
Fig. 1 is a schematic view of the positive current collector structure according to the present invention.
Fig. 2 is a schematic view of the structure of the negative current collector of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1-positive electrode empty foil area; 2-positive coating area; 3-positive through hole; 4-positive concave structure; 5-positive convex structure; 1' -a negative foil empty area; 2' -a negative coating zone; 3' -a negative through-hole; 4' -negative concave structure; 5' -negative electrode convex structure.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the utility model.
Example 1
Referring to fig. 1, the present invention provides an anode current collector structure, including an anode empty foil area 1 and an anode coating area 2, wherein the anode empty foil area 1 and the anode coating area 2 are both uniformly provided with anode through holes 3, the anode coating area 1 is further provided with an anode concave structure 4 and/or an anode convex structure 5, the anode concave structure 4 and the anode convex structure 5 are arranged along a current collector winding direction, and the anode concave structure 4 and the anode convex structure 5 are arranged at intervals.
As one of the preferable schemes in this embodiment, the positive electrode coating region 2 is rolled to make its surface concave and convex, so as to form a positive electrode concave structure 4 and a positive electrode convex structure 5 respectively; part of the positive through holes 3 are arranged between the positive concave structures 4 and the positive convex structures 5, and the lengths of the positive concave structures 4 and the positive convex structures 5 are smaller than the length of the current collector coating area along the winding direction; the width of the positive electrode concave structure 4 and the positive electrode convex structure 5 is 1/10-1/11 of the width of a current collector coating area, and the width of the current collector coating area is preferably 1/10 in the embodiment; the depth of the positive electrode concave structure 4 and the positive electrode convex structure 5 is 0.5-1 mm, and the preferred depth of the positive electrode concave structure and the positive electrode convex structure is 0.6 mm.
In one preferable embodiment of the present invention, the positive through hole 3 is circular, and the diameter of the circle is 2 to 4mm, preferably 3 mm.
Example 2
On the basis of embodiment 1, the embodiment discloses a winding core structure, wherein the winding core comprises a positive plate, a diaphragm and a negative plate which are sequentially stacked and wound;
the positive plate comprises the positive current collector and a positive coating in embodiment 1, and the positive coating is coated on the surface of the positive coating area 2 of the positive current collector;
the negative plate comprises a negative current collector and a negative coating, as shown in fig. 2, the negative current collector comprises a negative empty foil area 1 ' and a negative coating area 2 ', the negative coating is coated on the surface of the negative coating area 2 ', and the negative coating and the positive coating are just opposite to each other.
The negative electrode empty foil area 1 ' is provided with a negative electrode through hole 3 ', the negative electrode coating area 2 ' is provided with a negative electrode concave structure 4 ' and/or a negative electrode convex structure 5 ', the negative electrode concave structure 4 ' and the negative electrode convex structure 5 ' are arranged along the current collector winding direction, and the negative electrode concave structure 4 ' and the negative electrode convex structure 5 ' are arranged at intervals.
As one of the preferable schemes in this embodiment, the negative electrode coating region 2 ' is rolled to make its surface concave and convex, so as to form a negative electrode concave structure 4 ' and a negative electrode convex structure 5 ', respectively; part of the negative electrode through holes 3 ' are arranged between the negative electrode concave structure 4 ' and the negative electrode convex structure 5 ', and the lengths of the negative electrode concave structure 4 ' and the negative electrode convex structure 5 ' are both smaller than the length of the current collector coating area along the winding direction; the width of the negative electrode concave structure 4 'and the width of the negative electrode convex structure 5' are 1/10-1/11 of the width of a current collector coating area, and the width is preferably 1/10 in the embodiment; the depth of the negative electrode concave structure 4 'and the negative electrode convex structure 5' is 0.5-1 mm, and the preferred depth of the negative electrode concave structure and the negative electrode convex structure is 0.6 mm.
In one preferable embodiment of the present invention, the negative through hole 3' is circular, and the diameter of the circle is 2 to 4mm, preferably 3 mm.
As one of the preferable schemes in this embodiment, the negative electrode concave structure 4 'and the negative electrode convex structure 5' on the negative electrode sheet are staggered with respect to the positive electrode concave structure 4 and the positive electrode convex structure 5 on the positive electrode sheet, so that a better loosening effect can be achieved inside the winding core.
When using this embodiment anodal mass flow body and negative current collector to make into electric core, can convolute anodal mass flow body, diaphragm, the negative current collector, convolute the completion back, the concave-convex structure in the coating district of the anodal mass flow body and setting up of through-hole structure make roll up the inside fluffy of core, reach better loose effect, simultaneously, still can rub the plain noodles district to the empty paper tinsel after convoluteing and form the full utmost point ear region, it is more loose to set up the through-hole at the empty paper tinsel of positive and negative pole and can make the full utmost point ear region ratio, above-mentioned structure setting all does benefit to the electrolyte infiltration, and above-mentioned method easy operation, and is with low costs, is suitable for industrial production and promotes.
Example 3
On the basis of the foregoing embodiment, the present embodiment provides a battery, where the battery includes the winding core in embodiment 2, specifically:
the battery is provided with a shell, a winding core and electrolyte are arranged in the shell, and the shell is communicated with an external circuit through tab areas at two ends of the winding core.
In the charging process of the battery, lithium ions are extracted from the positive coating of the positive plate and are embedded into the negative coating of the negative plate after passing through the diaphragm; in the discharging process of the battery, lithium ions are extracted from the negative electrode coating of the negative electrode plate, pass through the diaphragm and are embedded into the positive electrode coating of the positive electrode plate.
The battery provided by this embodiment, because the roll core in embodiment 2 is adopted, that is, the battery provided by this embodiment is an all-electrode-ear lithium ion battery, the internal structure of the battery provided by this embodiment enables the electrolyte in the battery to achieve a good wetting effect, shortens the transmission path of lithium ions in the battery, is beneficial to the shuttle of lithium ions between the positive electrode and the negative electrode, and further improves the rate capability, the discharge capacity and the service life of the battery.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a positive pole mass flow body, its characterized in that includes anodal empty foil district and anodal coating district, anodal empty foil district and anodal coating district all are provided with anodal through-hole, anodal coating district still is provided with anodal concave structure and/or anodal convex structure.
2. The positive electrode current collector according to claim 1, wherein the positive electrode concave structure and the positive electrode convex structure are disposed in a current collector winding direction.
3. The positive electrode current collector of claim 1, wherein the positive electrode concave structures and the positive electrode convex structures are spaced apart from each other.
4. The positive electrode current collector of claim 1, wherein the positive electrode concave structure or the positive electrode convex structure has a length less than a length of the current collector coating region in a winding direction; the width of the positive electrode concave structure or the positive electrode convex structure is 1/10-1/11 of the width of the current collector coating area; the depth of the positive electrode concave structure or the positive electrode convex structure is 0.5-1 mm.
5. The positive electrode current collector of any one of claims 1 to 4, wherein the shape of the positive electrode through hole is one or more of circular, square and triangular.
6. The positive electrode current collector according to claim 5, wherein the positive electrode through-hole has a circular shape having a diameter of 2 to 4 mm.
7. A winding core is characterized by comprising a positive plate, a diaphragm and a negative plate which are sequentially stacked and wound;
the positive plate comprises the positive current collector and a positive coating, wherein the positive coating is coated on the surface of a positive coating area of the positive current collector;
the negative plate comprises a negative current collector and a negative coating, the negative current collector comprises a negative empty foil area and a negative coating area, the negative coating is coated on the surface of the negative coating area, and the negative coating is opposite to the positive coating;
the negative electrode empty foil area is provided with a negative electrode through hole, and the negative electrode coating area is provided with a negative electrode concave structure and/or a negative electrode convex structure.
8. The winding core according to claim 7, wherein the negative electrode concave structure and the negative electrode convex structure are arranged in a current collector winding direction.
9. The winding core according to claim 7 or 8, wherein the negative electrode concave structure and the negative electrode convex structure on the negative electrode sheet are arranged in a staggered manner relative to the positive electrode convex structure and the positive electrode concave structure on the positive electrode sheet.
10. A battery comprising the winding core according to any one of claims 7 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123240204.7U CN216624342U (en) | 2021-12-22 | 2021-12-22 | Positive current collector, roll core and battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123240204.7U CN216624342U (en) | 2021-12-22 | 2021-12-22 | Positive current collector, roll core and battery |
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| CN216624342U true CN216624342U (en) | 2022-05-27 |
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| CN202123240204.7U Active CN216624342U (en) | 2021-12-22 | 2021-12-22 | Positive current collector, roll core and battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115084430A (en) * | 2022-07-20 | 2022-09-20 | 苏州宇量电池有限公司 | Full-lug battery cell, battery and assembly method |
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2021
- 2021-12-22 CN CN202123240204.7U patent/CN216624342U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115084430A (en) * | 2022-07-20 | 2022-09-20 | 苏州宇量电池有限公司 | Full-lug battery cell, battery and assembly method |
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