Current collector, electrode plate of the same and battery
The present application relates to a current collector, an electrode plate, a battery and usages thereof. The current collector includes at least one conductive layer configured to support an electrode active material layer, and an insulation layer configured to support the at least one conductive layer. The conductive layer has a room temperature film resistance R S satisfying 0.01Ω/□≤R S ≤0.15Ω/□. The current collector can significantly increase resistance in short-circuit and reduce current in the short-circuit, and reduce heat generated during the short-circuit and improving safety performance. The heat can be totally absorbed by the battery. Therefore, the resulted temperature rise of the battery is small, the damage to the battery caused by the short circuit can be limited to a “point”, and only a “point break” is formed, without influencing normal operation of the battery in a short time.
1. A battery, comprising
a positive electrode plate;
a separator;
a negative electrode plate; and
an electrolyte,
wherein at least one of the positive electrode plate or the negative electrode plate comprises a current collector, and an electrode active material layer formed on a surface of the current collector,
wherein the current collector of at least one of the positive electrode plate or the negative electrode plate comprises an insulation layer and at least one conductive layer, the insulation layer is configured to support the at least one conductive layer, and the at least one conductive layer is configured to support the electrode active material layer;
wherein each of the at least one conductive layer has a room temperature film resistance R s satisfying 0.01Ω/□≤R S ≤0.15Ω/□, and
an internal resistance r of the battery and a capacitance Cap of the battery satisfy 25 Ah·mΩ≤r×Cap≤400 Ah·mΩ.
2. The battery according to claim 1 , wherein each of the at least one conductive layer has a room temperature film resistance R s satisfying 0.02Ω/□≤R S ≤0.1 Ω/□.
3. The battery according to claim 1 , wherein each of the at least one conductive layer has a thickness of D 2 satisfying 300 nm≤D 2 ≤2 μm.
4. The battery according to claim 1 , wherein the insulation layer has a thickness of D 1 satisfying 1 μm≤D 1 ≤20 μm.
5. The battery according to claim 1 , wherein the insulation layer is made of a material selected from a group consisting of an organic polymer insulation material, an inorganic insulation material, a composite material, or combinations thereof,
wherein the organic polymer insulation material is selected from a group consisting of polyamide, polyethylene terephthalate, polyimide, polyethylene, polypropylene, polystyrene, polyvinyl chloride, acrylonitrile-butadiene-styrene copolymer, polybutylene terephthalate, poly-p-phenylene terephthamide, ethylene propylene rubber, polyformaldehyde, epoxy resin, phenol-formaldehyde resin, polytetrafluoroethylene, polyvinylidene fluoride, silicone rubber, polycarbonate, or combinations thereof,
wherein the inorganic insulation material is selected from a group consisting of aluminum oxide, silicon carbide, silicon dioxide, or combinations thereof, and
wherein the composite material is selected from a group consisting of an epoxy resin glass fiber reinforced composite material, a polyester resin glass fiber reinforced composite material, or combinations thereof.
6. The current collector according to claim 1 , wherein each of the at least one conductive layer comprises a conductive layer body, a lower protective layer located between the conductive layer body and the insulation layer, and/or an upper protective layer located on a surface of the conductive layer body facing away from the insulation layer,
wherein the lower protective layer and the upper protective layer are each made of a material selected from a group consisting of metal, metal oxide, conductive carbon, or combinations thereof, wherein the metal is selected from a group consisting of nickel, chromium, nickel-based alloy, copper-based alloy, or combinations thereof; the metal oxide is selected from a group consisting of aluminum oxide, cobalt oxide, chromium oxide, nickel oxide, or combinations thereof; and the conductive carbon is selected from a group consisting of conductive carbon black, carbon nanotube, acetylene black, graphene, or combinations thereof, and
wherein the conductive layer body is made of a material selected from a group consisting of a metallic conductive material, a carbon-based conductive material, or combinations thereof, wherein the metallic conductive material is selected from a group consisting of aluminum, copper, nickel, titanium, silver, nickel-copper alloy, aluminum-zirconium alloy, or combinations thereof; and the carbon-based conductive material is selected from a group consisting of graphite, acetylene black, graphene, carbon nanotube, or combinations thereof.
7. The battery according to claim 6 , wherein the lower protective layer and the upper protective layer have each a thickness of D 3 satisfying D 3 ≤ 1/10D 2 , and 1 nm≤D 3 ≤200 nm.
8. The battery according to claim 1 , wherein each of the at least one conductive layer has a thickness of D 2 satisfying 500 nm≤D 2 ≤1.5 μm.
9. The battery according to claim 1 , wherein the insulation layer has a thickness of D 1 satisfying 2 μm≤D 1 ≤10 μm.
10. The battery according to claim 1 , wherein the insulation layer has a thickness of D 1 satisfying 2 μm≤D 1 ≤6 μm.
11. The battery according to claim 6 , wherein the lower protective layer and the upper protective layer have each a thickness of D 3 satisfying 10 nm≤D 3 ≤50 nm.