CN214254470U - Composite current collector, battery pole piece, battery and vehicle - Google Patents
Composite current collector, battery pole piece, battery and vehicle Download PDFInfo
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- CN214254470U CN214254470U CN202023083839.6U CN202023083839U CN214254470U CN 214254470 U CN214254470 U CN 214254470U CN 202023083839 U CN202023083839 U CN 202023083839U CN 214254470 U CN214254470 U CN 214254470U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model is suitable for a battery technology field provides a compound mass flow body, battery pole piece, battery and vehicle. The composite current collector comprises a current collector body, the current collector body comprises a supporting layer and conducting layers arranged on two sides of the supporting layer respectively, the current collector body is provided with a first through hole penetrating through the supporting layer and the conducting layers and a second through hole at least penetrating through the supporting layer, and filling parts connected with conducting materials of the conducting layers at two ends are filled in the second through holes. Electrodes, batteries, and vehicles have the above-described composite current collector. The utility model provides a composite current collector, battery pole piece, battery and vehicle adopts the design of novel porous composite current collector, is favorable to lithium ion's transmission, reduces the polarization influence that the mass flow body brought because of difference between the conducting layer of just, two sides of turning over coating, improves the theoretical mass energy density of electric core, still does benefit to the internal resistance that reduces electric core, welds brokenly the risk with the conducting layer when can avoiding composite current collector switching utmost point ear.
Description
Technical Field
The utility model belongs to the technical field of the battery, especially, relate to a compound mass flow body, battery pole piece, battery and vehicle.
Background
The composite current collector in the lithium battery mainly comprises a polymer supporting layer and metal conducting layers contained on two sides of the supporting layer, the polymer is used as the supporting layer, the mechanical property and the mechanical property of foil can be improved, the weight of the whole two-dimensional foil current collector can be reduced, and therefore the risk of electrode piece fragments is reduced, and the quality energy density of a battery cell is improved.
In the prior art, in the production process of coating a continuous and compact composite current collector, the dressing amount and the surface density of two surfaces of an electrode pole piece are bound to be different due to the limitations of the production capacity of equipment and the surface density of the current collector, and in the circulation process of a cell, the polarization degree of the two surfaces of the electrode pole piece is different due to the difference of the surface density of the two surfaces of the electrode pole piece during charging and discharging, the degradation degree of the two surfaces is also different after long circulation, and the resistance of the cell is directly increased;
in addition, in the production process of using the continuous and compact composite current collector tabletting, due to the fact that the elastic modulus of the polymer supporting layer and the elastic modulus of the metal conducting layer are different, the deformation of the polymer supporting layer and the metal conducting layer are different in the calendering process, so that the electrode pole piece can generate obvious deformation, even when the compaction density is high, bulge cracks are generated, great obstruction is caused to the subsequent winding production process, and the adjustment of the regularity of the pole core is directly influenced;
moreover, the metal conducting layers of the composite current collector are distributed on two sides of the polymer supporting layer, so that metal tabs are required to be connected on two sides when the electrode pole piece is manufactured, and the metal conducting layers on the surface of the composite current collector are thin, so that the metal tabs on two sides are very easy to weld and break when being welded.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art not enough, provide a composite current collector, battery pole piece, battery and vehicle, it does benefit to the debugging that reduces electric core resistance and utmost point core regularity, easily welds broken phenomenon when avoiding welding both sides metal tab.
The technical scheme of the utility model is that: the utility model provides a composite current collector, includes the mass flow body, the mass flow body includes the supporting layer and divides to locate the conducting layer on supporting layer two sides, the mass flow body be provided with run through in the supporting layer with the first through-hole of conducting layer, the mass flow body still is provided with and runs through at least the second through-hole of supporting layer, it has conducting material filling part to fill in the second through-hole, just the both ends of conducting material filling part respectively with be located the conducting layer on supporting layer two sides meets.
Optionally, the conductive material filling part and the conductive layer are made of the same metal.
Optionally, tab welding areas are formed at positions, close to the two sides, of the current collector body, and a middle area is formed between the tab welding areas at the two sides;
the first through holes and the second through holes are multiple, each first through hole is arranged in the middle area of the current collector body, each second through hole penetrates through the supporting layer and the conducting layer, and each second through hole is respectively arranged in the tab welding area of the current collector body.
Optionally, tab welding areas are formed at positions, close to the two sides, of the current collector body, and a middle area is formed between the tab welding areas at the two sides;
the first through holes are arranged in a plurality of numbers, each first through hole is arranged in the middle area of the current collector body, and the second through holes only penetrate through the supporting layer and integrally remove the lug welding area corresponding to the supporting layer.
Optionally, the aperture of the first through hole is larger than the aperture of the second through hole, or/and the distance between adjacent first through holes is larger than the distance between adjacent second through holes.
Optionally, the support layer is a polymer material layer or a polymer-based composite material layer.
Optionally, the polymer material layer is made of one of polyamide, polyimide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, acrylonitrile-butadiene-styrene copolymer, polyvinyl alcohol, polystyrene, polyvinyl chloride, polyvinylidene fluoride, polytetrafluoroethylene, sodium polystyrene sulfonate, polyacetylene, silicone rubber, polyformaldehyde, polyphenylene oxide, polyphenylene sulfide, polyethylene glycol, sulfur nitride, polystyrene, polypyrrole, polyaniline, polythiophene, polypyridine, cellulose, starch, protein, epoxy resin, and phenol resin.
Optionally, the support layer has a thickness of 1 to 30 microns.
Optionally, the conductive layer and the conductive material filling portion are made of one of aluminum, aluminum alloy, nickel alloy, copper alloy, titanium, and silver.
Optionally, the conductive layer has a thickness of 30 nanometers to 3 micrometers.
Optionally, the diameter of the first via is 10nm to 2000 nm; or/and the diameter of the second through hole is 5nm to 500 nm.
Optionally, the total porosity of the first and second through-holes at the current collector body is between 30% -90%.
Optionally, both sides of the current collector body are provided with a protective layer.
Optionally, the protective layer has a thickness of 1 nm to 200 nm.
The utility model also provides a battery pole piece, battery pole piece includes foretell a compound mass flow body.
The utility model also provides a battery, which comprises the composite current collector; alternatively, the battery comprises a battery pole piece as described above.
The utility model also provides a vehicle, the vehicle comprises the composite current collector; alternatively, the vehicle comprises a battery pole piece as described above or a battery as described above.
The utility model provides a composite current collector, battery pole piece, battery and vehicle adopts the design of novel porous composite current collector, and in the coating production process, the conducting layers on the front and back sides of the supporting layer are connected through the conducting material filling part in the second through hole to form the similar I-shaped occlusion, which is beneficial to improving the peeling strength between the active material and the current collector; the arrangement of the first through hole is beneficial to the transmission of lithium ions, the polarization influence of the current collector body caused by the difference between the conductive layers coated on the front surface and the back surface is reduced, and the internal resistance of the battery cell is reduced; by adopting the arrangement of the first through hole and the second through hole, the stress borne by the active material, the supporting layer and the conducting layer in the tabletting process can be properly released, the deformation is weakened, the radian of the electrode plate is reduced, the adjustment of the uniformity of the electrode core in the subsequent winding section is facilitated, the weight of the foil current collector and the whole electrode plate can be further reduced, and the theoretical mass energy density of the battery cell is improved; moreover, more and denser and smaller second through holes are designed in the lug welding areas on the two side edges of the current collector body, or the supporting layer at the lug welding areas is integrally hollowed (removed) to form the second through holes, and metal identical to the conducting layer is injected to make the second through holes become solid holes, so that the conducting layers on the two sides of the supporting layer are directly communicated, the risk that the conducting layer is welded to be broken when the composite current collector is connected with the lugs can be avoided, the number of connected metal lugs can be reduced, and the reliability is good.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic plan view of a composite current collector provided in an embodiment of the present invention;
fig. 2 is a schematic partial perspective view of a composite current collector provided in an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a composite current collector provided in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.
It should be noted that the terms of orientation such as left, right, up and down in the embodiments of the present invention are only relative to each other or are referred to the normal use state of the product, and should not be considered as limiting.
As shown in fig. 1 to 3, an embodiment of the present invention provides a composite current collector, which includes a current collector body 100, wherein the current collector body 100 includes a support layer 110 and conductive layers 120 respectively disposed on two sides of the support layer 110, the current collector body 100 is provided with first through holes 101 penetrating through the support layer 110 and the conductive layers 120 and allowing lithium ions to pass through, the current collector body 100 is further provided with second through holes 102 penetrating at least the support layer 110, the second through holes 102 are filled with conductive material filling portions 130, and two ends of the conductive material filling portions 130 are respectively connected to the conductive layers 120 disposed on two sides of the support layer 110, such that the conductive layers 120 on the front and back sides are connected to each other through the conductive material filling portions 130 in the second through holes 102 to form an "i" shape-like "engagement structure, which is beneficial to improving active materials, the conductive layers 120, and lithium ion concentration, Due to the peeling strength between the current collector bodies 100, the second through holes 102 are changed into solid holes through the filling of the conductive material filling parts 130, so that the conductive layers 120 on the two sides of the support layer 110 are directly communicated, the risk of welding the metal conductive layers 120 when the composite current collector is used for transferring the tabs can be avoided, and the number of the transferred metal tabs can be reduced; and the porous design of the first through hole 101 and the second through hole 102 is adopted, the stress borne by the active material, the current collector body 100 and the conducting layer 120 in the tabletting process can be properly released, the deformation is weakened, the radian of an electrode pole piece is reduced, and the debugging of the pole core uniformity of a subsequent winding section is facilitated.
Specifically, the conductive material filling portion 130 and the conductive layer 120 may be made of the same metal, in this embodiment, the conductive layer 120 is a metal conductive layer 120, the same metal material as the conductive layer 120 is injected into the second through hole 102, and the connection reliability between the conductive layer 120 and the conductive material filling portion 130 is high.
Specifically, the regions of the current collector body 100 close to the two sides are tab welding regions, and the region between the tab welding regions on the two sides is a middle region; the first through holes 101 and the second through holes 102 are provided in plurality, each first through hole 101 is provided in a middle area of the current collector body 100, each second through hole 102 penetrates through the support layer 110 and the conductive layer 120, each second through hole 102 is provided in a tab welding area of the current collector body 100, a conductive material filling portion may be filled in the second through hole 102, and an area of the second through hole 102 is an area for welding a tab.
Specifically, the aperture of the first through hole 101 is larger than the aperture of the second through hole 102, and specifically, the distance between adjacent first through holes 101 is larger than the distance between adjacent second through holes 102, i.e., along the first direction. The second through holes 102 are filled with the conductive material filling portions 130 to form solid holes, which have smaller diameters and are densely distributed, and are mainly distributed in the regions at the two side edges of the current collector to ensure the reliability of connection with the tabs. The first through holes 101 are large in aperture, sparse in distribution and mainly distributed in the middle area of the composite current collector, so that lithium ion transmission is facilitated, polarization influence caused by coating difference of the front surface and the back surface of the current collector body 100 is reduced, internal resistance of an electric core is reduced, and debugging of the regularity of the pole core of a subsequent winding section is facilitated.
Of course, in a specific application, the diameters, the intervals, and the like of the first through holes 101 and the second through holes 102 may also be flexibly set according to practical applications, for example, the diameters of the first through holes 101 and the second through holes 102 are equal.
Specifically, the support layer 110 may be a polymer material layer or a polymer-based composite material layer.
In a specific application, the polymer material layer (the support layer 110) may be at least one of polymer materials such as polyamide, polyimide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, acrylonitrile-butadiene-styrene copolymer, polyvinyl alcohol, polystyrene, polyvinyl chloride, polyvinylidene fluoride, polytetrafluoroethylene, sodium polystyrene sulfonate, polyacetylene, silicone rubber, polyoxymethylene, polyphenylene oxide, polyphenylene sulfide, polyethylene glycol, sulfur nitride, polystyrene, polypyrrole, polyaniline, polythiophene, polypyridine, cellulose, starch, protein, epoxy resin, and phenol resin;
or the polymer material layer is a derivative, cross-linked product or copolymer of at least one of polymer materials such as polyamide, polyimide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, acrylonitrile-butadiene-styrene copolymer, polyvinyl alcohol, polystyrene, polyvinyl chloride, polyvinylidene fluoride, polytetrafluoroethylene, sodium polystyrene sulfonate, polyacetylene, silicone rubber, polyoxymethylene, polyphenylene oxide, polyphenylene sulfide, polyethylene glycol, sulfur nitride, polystyrene, polypyrrole, polyaniline, polythiophene, polypyridine, cellulose, starch, protein, epoxy resin, phenol resin and the like.
In a specific application, the polymer-based composite material layer may include a polymer material and an additive, where the additive includes at least one of a metal material and an inorganic non-metal material.
Specifically, the novel polymer support layer 110 has a wide oxidation-reduction potential window, is not reactive with positive and negative active materials and an electrolyte, and is stable; in this embodiment, the thickness of the support layer 110 may be 1 to 30 micrometers, which has high mechanical and mechanical properties.
Specifically, the conductive layer 120 and the conductive material filling part 130 may be made of at least one of aluminum, an aluminum alloy, nickel, a nickel alloy, copper, a copper alloy, titanium, and silver.
Specifically, the thickness of the conductive layer 120 may be 30 nm to 3 μm, and the conductive layer 120 may be attached to the surface of the support layer 110 by mechanical rolling, bonding, vapor deposition, electroless plating, or electroplating.
Specifically, the diameter of the first through hole 101 may be 10nm to 2000nm to facilitate the transmission of lithium ions.
Specifically, the diameter of the second through hole 102 may be 5nm to 500nm, so as to avoid processing difficulty due to too small aperture and performance degradation due to too large aperture.
In a specific application, the total porosity of the first through hole 101 and the second through hole 102 in the current collector body 100 is between 30% and 90%, and of course, in a specific application, the diameter of the first through hole 101, the diameter of the second through hole 102, and the total porosity may also be set according to a specific situation.
In particular, both sides of the current collector body 100 may be provided with a protective layer, which is beneficial to enhance the conductivity and current collecting capability of the current collector.
Specifically, the thickness of the protective layer can be 1 nm to 200 nm, and the protective effect is good.
In this embodiment, the positions of the first through holes 101 and the second through holes 102 in the support layer 110 and the conductive layer 120 are the same, but the hole diameters, the number, and the distribution positions are different. The first through holes 101 are hollow through holes, have relatively large apertures and are distributed sparsely, and are mainly distributed in the middle area of the composite current collector, while the second through holes 102 have relatively small apertures and are distributed densely, and are mainly distributed in the areas at the two side edges, and the metal material which is the same as that of the metal conductive layer 120 is injected into the second through holes 102 to form solid holes, and the injected metal material may be one or more of aluminum, aluminum alloy, nickel alloy, copper alloy, titanium and silver. The flow of the first through hole 101 and the second through hole 102 is also divided into two steps: firstly, one or more of direct mechanical stamping, chemical corrosion, melt solution impregnation and airflow punching methods are adopted to prepare hollow through holes (a first through hole 101 and a second through hole 102) with different aperture sizes and numbers in the middle and two side edge areas of the composite current collector, the shape of the hollow through holes can be a circle, an ellipse, a semicircle, a square, a hexagon, a triangle, a diamond, a trapezoid or an irregular polygon, and the shape can be one or more, then one or more of injection, tape casting and electrodeposition methods are adopted to inject the metal which is the same as the metal conducting layer 120 into the hollow through holes (the second through holes 102) with smaller aperture distribution and denser distribution on the two side edges, so that the metal is changed into a solid hole, and the injected metal layer can be well connected with the metal conducting layers 120 on the two sides of the polymer supporting layer 110. The first through hole 101 may have a pore size ranging from 10nm to 2000nm, the second through hole 102 may have a pore size ranging from 5nm to 500nm, and the total porosity may be between 30% and 90%.
In specific application, before the composite current collector is manufactured, the current collector body 100 needs to be cleaned, decontaminated and subjected to surface treatment, then the first through hole 101 and the second through hole 102 are manufactured by using upper and lower dies with corresponding sizes or a chemical and physical method, and after the holes are manufactured, partial post-treatment, such as blowing drying, scrubbing and polishing, needs to be performed, so that the porous composite current collector suitable for manufacturing of electrode plates and electrochemical devices is obtained.
In specific application, when the composite current collector is used for manufacturing an electrode plate, a protective layer is coated on the surface of the current collector body 100 in advance, so that the conductivity and the current collecting capacity of the current collector are enhanced, meanwhile, the peeling strength between the current collector and an active material can be improved, then the active material, an optional conductive agent and an optional binder are dispersed in a solvent, the solvent can be NMP (N-methyl pyrrolidone) or deionized water, uniform electrode mixed slurry is formed, the electrode mixed slurry is coated on the composite current collector, and the required electrode plate is obtained after the procedures of drying, tabletting and the like.
In specific application, the positive electrode plate and the negative electrode plate which are manufactured by using the composite current collector are matched with different electrolytes and diaphragms, so that the required electrochemical device, such as a primary battery, a secondary battery, a solid-state battery and the like, can be manufactured.
In addition, the composite polymer layer (the support layer 110) is formed on the porous current collector, and the composite current collector with the same advantages can be formed through different processing flows.
Or, a plurality of first through holes 101 are provided, each first through hole 101 is provided in the middle area of the current collector body 100, the second through hole 102 only penetrates through the support layer 110 and removes the support layer 110 corresponding to the tab welding area as a whole, and the second through hole 102 may extend to the side of the support layer 110, that is: the supporting layer 110 corresponding to the tab welding areas on the two sides of the porous composite current collector is hollowed or reserved with a gap (equivalent to the gap of the second through hole 102 approaching zero), and the metal layer is directly injected into the hollowed or reserved gap and then the metal tab is connected, or the two metal conductive layers 120 are directly welded and then the metal tab is connected, and finally welded, which can also show the same advantages.
The embodiment of the utility model provides a battery pole piece is still provided, battery pole piece includes foretell a compound mass flow body.
The embodiment of the utility model also provides a battery, the battery includes above-mentioned compound mass flow body; alternatively, the battery comprises a battery pole piece as described above.
The embodiment of the utility model also provides a vehicle, the vehicle includes above-mentioned compound mass flow body; alternatively, the vehicle comprises one of the battery pole pieces described above or one of the batteries described above.
The embodiment of the utility model provides a composite current collector, battery pole piece, battery and vehicle adopts the design of novel porous composite current collector, and in the coating production process, the conducting layer 120 on the front and back sides of the supporting layer 110 is connected through the conducting material filling part 130 in the second through hole 102, forming the occlusion similar to the shape of the Chinese character 'I', and being beneficial to the improvement of the peeling strength between the active material and the current collector; the arrangement of the first through hole 101 is beneficial to the transmission of lithium ions, the polarization influence of the current collector body 100 caused by the difference between the conductive layers 120 coated on the front surface and the back surface is reduced, and the internal resistance of a battery cell is reduced; by adopting the arrangement of the first through hole 101 and the second through hole 102, the stress borne by the active material, the supporting layer 110 and the conducting layer 120 in the tabletting process can be properly released, the deformation is weakened, the radian of the electrode pole piece is reduced, the debugging of the regularity of the pole core of the subsequent winding section is facilitated, the weight of the foil current collector and the whole electrode pole piece can be further reduced, and the theoretical mass energy density of the battery cell is improved; moreover, the more, denser and smaller second through holes 102 are designed in the tab welding areas on the two side edges of the current collector body 100, and the same metal as the conductive layer 120 is injected, and the second through holes 102 become solid holes, so that the conductive layers 120 on the two sides of the support layer 110 are directly communicated, thereby not only avoiding the risk of welding the conductive layer 120 when the composite current collector is connected with a tab, but also reducing the number of connected metal tabs, and having good reliability.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the present invention.
Claims (17)
1. The utility model provides a composite current collector, its characterized in that, includes the mass flow body, the mass flow body includes the supporting layer and divides to locate the conducting layer of supporting layer two sides, the mass flow body be provided with run through in the supporting layer with the first through-hole of conducting layer, the mass flow body still is provided with and runs through at least the second through-hole of supporting layer, it has conducting material filling part to fill in the second through-hole, just the both ends of conducting material filling part respectively with be located the conducting layer of supporting layer two sides meets.
2. The composite current collector of claim 1, wherein the conductive material fill is made of the same metal as the conductive layer.
3. The composite current collector of claim 1, wherein the current collector body comprises tab weld areas adjacent to two sides and an intermediate area between the tab weld areas on the two sides;
the first through holes and the second through holes are multiple, each first through hole is arranged in the middle area of the current collector body, each second through hole penetrates through the supporting layer and the conducting layer, and each second through hole is respectively arranged in the tab welding area of the current collector body.
4. The composite current collector of claim 1, wherein the current collector body comprises tab weld areas adjacent to two sides and an intermediate area between the tab weld areas on the two sides;
the first through holes are arranged in a plurality of numbers, each first through hole is arranged in the middle area of the current collector body, and the second through holes only penetrate through the supporting layer and integrally remove the lug welding area corresponding to the supporting layer.
5. The composite current collector of claim 3, wherein the first through holes have a larger diameter than the second through holes, or/and wherein the spacing between adjacent first through holes is larger than the spacing between adjacent second through holes.
6. The composite current collector of any one of claims 1 to 5, wherein the support layer is a polymer material layer or a polymer-based composite material layer.
7. The composite current collector of claim 6, wherein the polymer material layer is one of polyamide, polyimide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, acrylonitrile-butadiene-styrene copolymer, polyvinyl alcohol, polystyrene, polyvinyl chloride, polyvinylidene fluoride, polytetrafluoroethylene, sodium polystyrene sulfonate, polyacetylene, silicone rubber, polyoxymethylene, polyphenylene oxide, polyphenylene sulfide, polyethylene glycol, sulfur nitride, polystyrene, polypyrrole, polyaniline, polythiophene, polypyridine, cellulose, starch, protein, epoxy resin, and phenol resin.
8. The composite current collector of any one of claims 1 to 5, wherein the support layer has a thickness of 1 to 30 microns.
9. The composite current collector of any one of claims 1 to 5, wherein said conductive layer and said conductive material fill are made of one of aluminum, aluminum alloy, nickel alloy, copper alloy, titanium, and silver.
10. The composite current collector of any one of claims 1 to 5, wherein said conductive layer has a thickness of 30 nm to 3 μm.
11. The composite current collector of any one of claims 1, 2, 3, 5, wherein the first via has a diameter of 10nm to 2000 nm; or/and the diameter of the second through hole is 5nm to 500 nm.
12. The composite current collector of any one of claims 1 to 5, wherein the total porosity of the first and second through-holes in the current collector body is between 30% and 90%.
13. The composite current collector of any one of claims 1 to 5, wherein the current collector body is provided with protective layers on both sides.
14. The composite current collector of claim 13, wherein the protective layer has a thickness of 1 nm to 200 nm.
15. A battery pole piece comprising a composite current collector as claimed in any one of claims 1 to 14.
16. A battery comprising a composite current collector as claimed in any one of claims 1 to 14; alternatively, the battery comprises a battery pole piece of claim 15.
17. A vehicle comprising a composite current collector of any one of claims 1 to 14; alternatively, the vehicle includes a battery pole piece of claim 15 or includes a battery of claim 16.
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| CN202023083839.6U CN214254470U (en) | 2020-12-18 | 2020-12-18 | Composite current collector, battery pole piece, battery and vehicle |
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| CN202023083839.6U CN214254470U (en) | 2020-12-18 | 2020-12-18 | Composite current collector, battery pole piece, battery and vehicle |
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| CN114497911A (en) * | 2022-01-25 | 2022-05-13 | 厦门海辰新能源科技有限公司 | Pole piece and lithium ion battery |
| CN116247222A (en) * | 2023-05-08 | 2023-06-09 | 宁德时代新能源科技股份有限公司 | Current collector, pole piece, electrode assembly, battery monomer, battery and electric equipment |
| CN116417621A (en) * | 2023-06-12 | 2023-07-11 | 广州方邦电子股份有限公司 | Composite foil, battery pole piece and battery |
| WO2023206688A1 (en) * | 2022-04-25 | 2023-11-02 | 江阴纳力新材料科技有限公司 | Composite current collector and preparation method therefor, and electrode plate and secondary battery |
| JP7399219B1 (en) | 2022-06-21 | 2023-12-15 | ソフトバンク株式会社 | Laminate, electrode structure, battery, flying vehicle, method for producing a laminate, and method for producing an electrode structure |
| WO2024073892A1 (en) * | 2022-10-08 | 2024-04-11 | 宁德时代新能源科技股份有限公司 | Composite current collector, electrode, secondary battery and electric device |
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| CN114497911A (en) * | 2022-01-25 | 2022-05-13 | 厦门海辰新能源科技有限公司 | Pole piece and lithium ion battery |
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| WO2023206688A1 (en) * | 2022-04-25 | 2023-11-02 | 江阴纳力新材料科技有限公司 | Composite current collector and preparation method therefor, and electrode plate and secondary battery |
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| WO2024073892A1 (en) * | 2022-10-08 | 2024-04-11 | 宁德时代新能源科技股份有限公司 | Composite current collector, electrode, secondary battery and electric device |
| CN116247222A (en) * | 2023-05-08 | 2023-06-09 | 宁德时代新能源科技股份有限公司 | Current collector, pole piece, electrode assembly, battery monomer, battery and electric equipment |
| CN116417621A (en) * | 2023-06-12 | 2023-07-11 | 广州方邦电子股份有限公司 | Composite foil, battery pole piece and battery |
| CN116417621B (en) * | 2023-06-12 | 2023-09-05 | 广州方邦电子股份有限公司 | Composite foil, battery pole piece and battery |
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