Electrode plate, electrochemical apparatus, and apparatus thereof

Patent metadata

Field	Value
Publication number	US-2022093933-A1
Application number	US-202117541300-A
Country	US
Kind code	A1
Filing date	Dec 3, 2021
Priority date	Jun 28, 2019
Publication date	Mar 24, 2022
Grant date	—

Abstract

This application relates to an electrode plate, an electrochemical apparatus, and an apparatus thereof. The electrode plate in this application includes a current collector, an electrode active material layer disposed 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 disposed on a main body portion of the current collector at 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 a transfer welding zone, and a transition zone of the current collector between the film zone and the transfer welding zone, coated with no electrode active material layer, is referred to as an extension zone. The current collector is a composite current collector.

First claim

What is claimed is:

1 . An electrode plate, comprising a current collector, an electrode active material layer disposed 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 disposed on a main body portion of the current collector at 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 a transfer welding zone, and a transition zone of the current collector between the film zone and the transfer welding zone, coated with no electrode active material layer, is referred to as an extension zone; the current collector comprises a support layer and a conductive layer disposed on at least one surface of the support layer, a single-sided thickness D2 of the conductive layer satisfies: 30 nm≤D2≤2 μm, and the support layer is a polymer material layer or a polymer composite material layer; and the electrode plate further comprises an internal-short-circuit protection layer, and the internal-short-circuit protection layer is an organic insulation layer and covers the electrical connection member in the transfer welding zone and at least a part of the extension zone.

2 . The electrode plate according to claim 1 , wherein the internal-short-circuit protection layer is selected from at least one of a transparent insulation tape, a colored insulation tape, a transparent insulation glue coating layer, and a colored insulation glue coating layer; and optionally, the internal-short-circuit protection layer is selected from a colored insulation tape or a colored insulation glue coating layer.

3 . The electrode plate according to claim 2 , wherein the transparent insulation glue coating layer or colored insulation glue coating layer is selected from at least one of styrene-acrylic emulsion, a phenolic resin layer, a polyvinyl chloride layer, a polystyrene layer, a polyethylene resin layer, an epoxy resin layer, a polyaniline layer, a polypyrrole layer, a polyacetylene layer, and a polyimide layer.

4 . The electrode plate according to claim 2 , wherein the colored insulation tape or colored insulation glue coating layer contains a coloring agent.

5 . The electrode plate according to claim 1 , wherein a support protection layer is further disposed on a surface of a composite current collector in the extension zone, and optionally the support protection layer is an organic insulation layer or an inorganic insulation layer.

6 . The electrode plate according to claim 5 , wherein the organic insulation layer is selected from an insulation tape layer or an insulation glue coating layer; and/or
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.

7 . The electrode plate according to claim 6 , wherein 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.

8 . The electrode plate according to claim 5 , wherein the inorganic insulation layer comprises inorganic insulation particles and a binder;
optionally, the inorganic insulation particles are at least one of aluminum oxide, magnesium oxide, zinc oxide, silicon oxide, titanium oxide, zirconium oxide, aluminum nitride, silicon nitride, calcium fluoride, and barium fluoride; and/or the binder is at least one of polyvinylidene fluoride, polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, styrene butadiene rubber, sodium carboxymethyl cellulose, polyacrylic acid, polyethylene oxide, and polyvinyl alcohol.

9 . The electrode plate according to claim 8 , wherein a percentage of the inorganic insulation particles is 50 wt % to 98 wt % based on a total weight of the inorganic insulation layer; and/or
a percentage of the binder is 2 wt % to 50 wt % based on the total weight of the inorganic insulation layer.

10 . 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 optionally 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, and optionally, the material of the support layer is an insulation polymer material or an insulation polymer composite material.

11 . The electrode plate according to claim 1 , wherein the current collector is further provided with a protection layer, the protection layer is disposed on one surface of the conductive layer of the current collector or disposed on two surfaces of the conductive layer of the current collector; and the protection layer is a metal protection layer or a metal oxide protection layer.

12 . The electrode plate according to claim 1 , wherein
a thickness D1 of the support layer satisfies: 1 μm≤D1≤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 are cracks in the conductive layer.

13 . The electrode plate according to claim 1 , wherein viewed in a width direction of a coated surface of the electrode plate, the electrode active material layer comprises 2n+1 zones based on compacted density, and compacted density of a middle zone is greater than compacted density of zones on both sides, wherein n=1, 2, or 3; and optionally, n=1.

14 . The electrode plate according to claim 1 , wherein a difference value between a thickness of the electrical connection member and the single-sided thickness D2 of the conductive layer is not more than 15 μm.

15 . The electrode plate according to claim 4 , wherein the coloring agent is selected from one or more of carbon black, cobalt blue, ultramarine blue, iron oxide, cadmium red, chrome orange, molybdenum orange, cadmium yellow, chrome yellow, nickel titanium yellow, titanium white, lithopone, zinc white, a phthalocyanine pigment, an azo pigment, an anthraquinone pigment, an indigo pigment, and a metal complex pigment.

16 . The electrode plate according to claim 3 , wherein the colored insulation tape or colored insulation glue coating layer contains a coloring agent.

17 . The electrode plate according to claim 16 , wherein the coloring agent is selected from one or more of carbon black, cobalt blue, ultramarine blue, iron oxide, cadmium red, chrome orange, molybdenum orange, cadmium yellow, chrome yellow, nickel titanium yellow, titanium white, lithopone, zinc white, a phthalocyanine pigment, an azo pigment, an anthraquinone pigment, an indigo pigment, and a metal complex pigment.

18 . 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 clai

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Li Wei
• Li Jing
• Xue Qingrui
• Zhang Yang
• Zhang Zige
• Wang Pengxiang
• Lu Yang

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/667 Primary

  in the form of layers, e.g. coatings · CPC title

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M4/626

  Metals · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title