Electrode plate, electrochemical apparatus, and apparatus thereof
This application relates to an electrode plate, an electrochemical apparatus, and an apparatus thereof. The electrode plate of this application includes a current collector, an electrode active material layer provided on at least one surface of the current collector, and an electrical connection member electrically connected to the current collector. The electrode active material layer is provided on a main body portion of the current collector in a zone referred to as a film zone, the electrical connection member and the current collector are welded and connected at an edge of the current collector, at a welding zone referred to as an transfer welding zone and a transition zone is referred to as an extension zone, where the transition zone is of the current collector between the film zone and the transfer welding zone, and is coated with no electrode active material layer.
1. An electrode plate, comprising a current collector, an electrode active material layer provided on at least one surface of the current collector, and an electrical connection member electrically connected to the current collector, wherein
the electrode active material layer is provided on a main body portion of the current collector at a film zone, the electrical connection member and the current collector are welded and connected at an edge of the current collector at a transfer welding zone, and an extension zone is of the current collector between the film zone and the transfer welding zone, and is coated with no electrode active material layer;
the current collector comprises a support layer and a conductive layer provided on at least one surface of the support layer, a single-sided thickness D 2 of the conductive layer satisfies: 30 nm≤D 2 ≤3 μm, and the support layer is a polymer material layer or a polymer composite material layer; and
a conductive primer coating layer containing a binder and a conductive material is separately provided between the current collector and the electrode active material layer in the film zone of the current collector and on a surface of the extension zone of the current collector; and
viewed in a width direction of a coated surface of the electrode plate, the electrode active material layer based on compacted density comprises 2n+1 zones, and compacted density of a middle zone is greater than compacted density of zones on both sides, wherein n=1, 2, or 3.
2. The electrode plate according to claim 1 , wherein based on a total weight of the conductive primer coating layer, a percentage of the conductive material by weight is 10% to 99%; and/or
based on a total weight of the conductive primer coating layer, a percentage of the binder by weight is 1% to 90%.
3. The electrode plate according to claim 2 , wherein a percentage of the conductive material by weight is 20% to 80%; and/or
a percentage of the conductive material by weight is 20% to 80%.
4. The electrode plate according to claim 2 , wherein a percentage of the conductive material by weight is 50% to 80%; and/or
a percentage of the binder by weight is 20% to 50%.
5. The electrode plate according to claim 1 , wherein a single-sided thickness H of the conductive primer coating layer is 0.1 μm to 5 μm; and/or
the binder in the conductive primer coating layer comprises an aqueous binder; and/or
the conductive material is a mixed material of a zero-dimensional conductive carbon material and a one-dimensional conductive carbon material or a mixed material of a zero-dimensional conductive carbon material and a two-dimensional conductive carbon material.
6. The electrode plate according to claim 5 , wherein a ratio of H to D 2 is 0.5:1 to 5:1.
7. The electrode plate according to claim 1 , wherein the conductive layer is a metal conductive layer, and a material of the metal conductive layer is selected from at least one of aluminum, copper, nickel, titanium, silver, nickel-copper alloy, and aluminum-zirconium alloy; and/or
a material of the support layer is selected from at least one of an insulation polymer material, an insulation polymer composite material, a conductive polymer material, and a conductive polymer composite material.
8. The electrode plate according to claim 7 , wherein the material of the support layer is an insulation polymer material or an insulation polymer composite material.
9. The electrode plate according to claim 1 , wherein a thickness D 1 of the support layer satisfies 1 μm≤D 1 ≤15 μm; and/or a room-temperature Young's modulus E of the support layer satisfies 20 Gpa≥E≥1.9 Gpa; and/or there is a crack in the conductive layer.
10. The electrode plate according to claim 1 , wherein a protection layer is further provided on a surface of the conductive layer of the current collector, the protection layer is provided only on one surface of the conductive layer of the current collector or provided on two surfaces of the conductive layer of the current collector, and a thickness D 3 of the protection layer satisfies: D 3 ≤ 1/10×D 2 and 1 nm≤D 3 ≤200 nm.
11. The electrode plate according to claim 10 , wherein the thickness D 3 of the protection layer satisfies: 10 nm≤D 3 ≤50 nm.
12. The electrode plate according to claim 1 , wherein a thickness of the conductive primer coating layer in the extension zone of the current collector is greater than a thickness of the conductive primer coating layer in the film zone, or an amount of the conductive material contained in the conductive primer coating layer in the extension zone of the current collector is higher than an amount of the conductive material contained in the conductive primer coating layer in the film zone.
13. The electrode plate according to claim 1 , wherein a support protection layer is further provided on a surface of the conductive primer coating layer in the extension zone of the current collector, and the support protection layer is an organic insulation layer or an inorganic insulation layer.
14. The electrode plate according to claim 13 , wherein the organic insulation layer is selected from an insulation tape layer or an insulation glue coating layer, the insulation glue coating layer is selected from at least one of a polyvinylidene fluoride layer, a polyvinylidene fluoride layer, a vinylidene fluoride-hexafluoropropylene copolymer layer, a styrene butadiene rubber layer, a sodium carboxymethyl cellulose layer, a polyacrylic acid layer, a sodium polyacrylate layer, a polyepoxy ethane layer, and a polyvinyl alcohol layer.
15. The electrode plate according to claim 13 , wherein the inorganic insulation layer is selected from at least one of an aluminum oxide layer, a magnesium oxide layer, a zinc oxide layer, a silicon oxide layer, a titanium oxide layer, a zirconium oxide layer, an aluminum nitride layer, a silicon nitride layer, a calcium fluoride layer, and a barium fluoride layer.
16. The electrode plate according to claim 1 , wherein the electrode active material layer comprises an electrode active material, a binder, and a conductive agent, and an average particle size D50 of the electrode active material layer is 5 μm to 15 μm.
17. An electrochemical apparatus, comprising a positive electrode plate, a negative electrode plate, a separator, and an electrolyte solution, wherein the positive electrode plate and/or the negative electrode plate are/is the electrode plate according to claim 1 .
18. An apparatus, comprising the electrochemical apparatus according to claim 17 , wherein the electrochemical apparatus is used as a power supply of the apparatus.