Cable-type secondary battery capable of wireless charge
The present invention provides a cable-type secondary battery capable of wireless charge. The cable-type secondary battery according to the present invention can be applied in a wireless charging method, thereby being conveniently charged as compared with conventional batteries which are charged with wires, and has a charging coil configured in a wound form, which can overcome the problem of local charge caused by the shape of conventional cable-type batteries. Also, the charging coil is formed in a packaging to act as a reinforcement material, thereby enhancing the mechanical property of the cable-type secondary battery.
1. A cable-type secondary battery capable of wireless charge, configured to have a horizontal cross section of a predetermined shape and to extend longitudinally and comprising:
a core configured to supply lithium ions, which comprises an electrolyte;
an inner electrode comprising an open-structured inner current collector surrounding the outer surface of the core for supplying lithium ions, and an inner electrode active material layer surrounding the surface of the inner current collector;
a separation layer surrounding the outer surface of the inner electrode to prevent a short circuit between electrodes;
an outer electrode surrounding the outer surface of the separation layer and comprising an outer electrode active material layer and an outer current collector; and
a packaging surrounding the outer surface of the outer electrode and comprising a heat-shrinkable tube layer and a charging coil configured in a wound form, the charging coil comprising a diode which electrically connects the inner current collector and the outer current collector therebetween, and the charging coil being electrically connected with the outer current collector at one end thereof and electrically connected with the inner current collector at the other end thereof.
2. The cable-type secondary battery capable of wireless charge according to claim 1 , wherein the diode is reversely connected from a high potential current collector being the inner current collector or the outer current collector to a low potential current collector being the outer current collector or the inner current collector.
3. The cable-type secondary battery capable of wireless charge according to claim 2 , wherein when the inner electrode is a cathode and the outer electrode is an anode, the diode is reversely connected from the inner current collector to the outer current collector, or
when the outer electrode is a cathode and the inner electrode is an anode, the diode is reversely connected from the outer current collector to the inner current collector.
4. The cable-type secondary battery capable of wireless charge according to claim 1 , wherein the electrolyte is selected from a non-aqueous electrolyte solution using ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), vinylene carbonate (VC), diethyl carbonate (DEC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), methyl formate (MF), γ-butyrolactone (γ-BL), sulfolane, methyl acetate (MA) or methyl propionate (MP); a gel polymer electrolyte using PEO, PVdF, PMMA, PAN, or PVAc; and a solid electrolyte using PEO, polypropylene oxide (PPO), polyether imine (PEI), polyethylene sulphide (PES), or polyvinyl acetate (PVAc).
5. The cable-type secondary battery capable of wireless charge according to claim 1 , wherein the electrolyte further comprises a lithium salt.
6. The cable-type secondary battery capable of wireless charge according to claim 5 , wherein the lithium salt is selected from LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiASF 6 , LiSbF 6 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2 ) 2 NLi, lithium chloroborate, lower aliphatic lithium carbonate, lithium tetraphenylborate, and a mixture thereof.
7. The cable-type secondary battery capable of wireless charge according to claim 1 , wherein the open-structured inner current collector is in the form of a wound wire, a wound sheet or a mesh.
8. The cable-type secondary battery capable of wireless charge according to claim 1 , wherein the inner current collector is made of stainless steel, aluminum, nickel, titanium, sintered carbon, or copper; stainless steel treated with carbon, nickel, titanium or silver on the surface thereof; an aluminum-cadmium alloy; a non-conductive polymer treated with a conductive material on the surface thereof; or a conductive polymer.
9. The cable-type secondary battery capable of wireless charge according to claim 8 , wherein the conductive material is selected from polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfurnitride, indium tin oxide (ITO), silver, palladium, nickel, and a mixture thereof.
10. The cable-type secondary battery capable of wireless charge according to claim 8 , wherein the conductive polymer is selected from polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfurnitride, and a mixture thereof.
11. The cable-type secondary battery capable of wireless charge according to claim 1 , wherein the separation layer is an electrolyte layer or a separator.
12. The cable-type secondary battery capable of wireless charge according to claim 11 , wherein the electrolyte layer comprises an electrolyte selected from a gel polymer electrolyte using PEO, PVdF, PMMA, PAN, or PVAc; and a solid electrolyte using PEO, polypropylene oxide (PPO), polyether imine (PEI), polyethylene sulphide (PES), or polyvinyl acetate (PVAc).
13. The cable-type secondary battery capable of wireless charge according to claim 11 , wherein the electrolyte layer further comprises a lithium salt.
14. The cable-type secondary battery capable of wireless charge according to claim 13 , wherein the lithium salt is selected from LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2 ) 2 NLi, lithium chloroborate, lower aliphatic lithium carbonate, lithium tetraphenylborate, and a mixture thereof.
15. The cable-type secondary battery capable of wireless charge according to claim 11 , wherein the separator is a porous substrate made of a polyolefin-based polymer selected from the group consisting of ethylene homopolymers, propylene homopolymers, ethylene-butene copolymers, ethylene-hexene copolymers, and ethylene-methacrylate copolymers; a porous substrate made of a polymer selected from the group consisting of polyesters, polyacetals, polyamides, polycarbonates, polyimides, polyether ether ketones, polyether sulfones, polyphenylene oxides, polyphenylene sulfides and polyethylene naphthalates; or a porous substrate made of a mixture of inorganic particles and a binder polymer.
16. The cable-type secondary battery capable of wireless charge according to claim 1 , wherein in the outer electrode,
the outer electrode active material layer is formed to surround the outer surface of the separation layer, and the outer current collector is formed to surround the outer surface of the outer electrode active material layer;
the outer current collector is formed to surround the outer surface of the separation layer, and the outer electrode active material layer is formed to surround the outer surface of the outer current collector;
the outer current collector is formed to surround the outer surface of the separation layer, and the outer electrode active material layer is formed to surround the outer surface of the outer current collector and come into contact with the separation layer; or
the outer electrode active material layer is formed to surround the outer surface of the separation layer, and the outer current collector is formed to be included inside the outer electrode active material layer by being covered therein and to surround the outer surface of the separation layer with spacing apart therefrom.
17. The cable-type secondary battery capable of wireless charge according to claim 1 , wherein the outer current collector is hollow, or is the form of a wire, a wound wire, a wound sheet or a mesh.
18. The cable-type secondary battery capable of wireless charge according to claim 1 , wherein the outer current collector is made of stainless steel, aluminum, nickel, titanium, sintered carbon, or copper; stainless steel treated with carbon, nickel, titanium or silver on the surface thereof; or an aluminum-cadmium alloy.
19. The cable-type secondary battery capable of wireless charge according to claim 1 , wherein the packaging has a first heat-shrinkable tube layer formed to surround the outer surface of the outer electrode, a charging coil formed by winding to surround the outer surface of the first heat-shrinkable tube layer, and a second heat-shrinkable tube layer formed to surround the outer surface of the charging coil; a first heat-shrinkable tube layer formed to surround the outer surface of the outer electrode, a charging coil formed by winding to surround the outer surface of the first heat-shrinkable tube layer, and a second heat-shrinkable tube layer formed to surround the outer surface of the charging coil and come into contact with the first heat-shrinkable tube layer; or a heat-shrinkable tube layer formed to surround the outer surface of the outer electrode, and a charging coil formed by winding to surround the outer surface of the outer electrode with spacing apart therefrom.
20. The cable-type secondary battery capable of wireless charge according to claim 1 , wherein the heat-shrinkable tube layer is made of any one selected from the group consisting of a polyolefin resin, a polyester resin, a fluoro-containing resin and a mixture thereof.
21. The cable-type secondary battery capable of wireless charge according to claim 1 , wherein the charging coil is made of stainless steel, aluminum, nickel, titanium, sintered carbon, or copper; stainless steel treated with carbon, nickel, titanium or silver on the surface thereof; or an aluminum-cadmium alloy.
22. The cable-type secondary battery capable of wireless charge according to claim 1 , wherein the charging coil has a thickness of 10 to 500 μm.
23. The cable-type secondary battery capable of wireless charge according to claim 1 , wherein the charging coil is wound in a frequency of 1 to 100 times per 1 mm of a unit length in the cable-type secondary battery.
24. The cable-type secondary battery capable of wireless charge according to claim 1 , wherein the inner electrode is an anode and the outer electrode is a cathode, or the inner electrode is a cathode and the outer electrode is an anode.
25. The cable-type secondary battery capable of wireless charge according to claim 1 , wherein when the inner electrode is an anode and the outer electrode is a cathode,
the inner electrode active material layer comprises an active material selected from the group consisting of natural graphite, artificial graphite, or carbonaceous material; lithium-titanium complex oxide (LTO), and metals (Me) including Si, Sn, Li, Zn, Mg, Cd, Ce, Ni and Fe; alloys of the metals; oxides (MeOx) of the metals; complexes of the metals and carbon; and mixtures thereof, and
the outer electrode active material layer comprises an active material selected from the group consisting of LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , LiCoPO 4 , LiFePO 4 , LiNiMnCoO 2 , LiNi 1-x-y-z Co x M1 y M2 z O 2 (wherein M1 and M2 are each independently selected from the group consisting of Al, Ni, Co, Fe, Mn, V, Cr, Ti, W, Ta, Mg and Mo, and x, y and z are each independently an atomic fraction of oxide-forming elements, in which 0≦x<0.5, 0≦y<0.5, 0≦z<0.5, and x+y+z≦1), and mixtures thereof.
26. The cable-type secondary battery capable of wireless charge according to claim 1 , wherein when the inner electrode is a cathode and the outer electrode is an anode,
the inner electrode active material layer comprises an active material selected from the group consisting of LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , LiCoPO 4 , LiFePO 4 , LiNiMnCoO 2 , LiNi 1-x-y-z Co x M1 y M2 z O 2 (wherein M1 and M2 are each independently selected from the group consisting of Al, Ni, Co, Fe, Mn, V, Cr, Ti, W, Ta, Mg and Mo, and x, y and z are each independently an atomic fraction of oxide-forming elements, in which 0≦x<0.5, 0≦y<0.5, 0≦z<0.5, and x+y+z≦1), and mixtures thereof, and
the outer electrode active material layer comprises an active material selected from the group consisting of natural graphite, artificial graphite, or carbonaceous material; lithium-titanium complex oxide (LTO), and metals (Me) including Si, Sn, Li, Zn, Mg, Cd, Ce, Ni and Fe; alloys of the metals; oxides (MeOx) of the metals; complexes of the metals and carbon; and mixtures thereof.
27. A cable-type secondary battery capable of wireless charge, configured to have a horizontal cross section of a predetermined shape and to extend longitudinally and comprising:
two or more cores configured to supply lithium ions, which comprise an electrolyte;
two or more inner electrodes arranged in parallel to each other, each inner electrode comprising an open-structured inner current collector surrounding the outer surface of each core for supplying lithium ions, and an inner electrode active material layer surrounding the surface of the inner current collector;
a separation layer surrounding the outer surface of the inner electrode to prevent a short circuit between electrodes;
an outer electrode surrounding the outer surface of the separation layer and comprising an outer electrode active material layer and an outer current collector; and
a packaging surrounding the outer surface of the outer electrode and comprising a heat-shrinkable tube layer and a charging coil configured in a wound form, the charging coil comprising a diode which electrically connects the inner current collector and the outer current collector therebetween, and the charging coil being electrically connected with the outer current collector at one end thereof and electrically connected with the inner current collector at the other end thereof.
28. A cable-type secondary battery capable of wireless charge, configured to have a horizontal cross section of a predetermined shape and to extend longitudinally and comprising:
two or more cores configured to supply lithium ions, which comprise an electrolyte;
two or more inner electrodes arranged in parallel to each other, each inner electrode comprising an open-structured inner current collector surrounding the outer surface of each core for supplying lithium ions, an inner electrode active material layer surrounding the surface of the inner current collector, and a separation layer surrounding the outer surface of the inner electrode active material layer to prevent a short circuit between electrodes;
an outer electrode surrounding the outer surface of the inner electrodes and comprising an outer electrode active material layer and an outer current collector; and
a packaging surrounding the outer surface of the outer electrode and comprising a heat-shrinkable tube layer and a charging coil configured in a wound form, the charging coil comprising a diode which electrically connects the inner current collector and the outer current collector therebetween, and the charging coil being electrically connected with the outer current collector at one end thereof and electrically connected with the inner current collector at the other end thereof.