Secondary battery, battery pack, vehicle, and stationary power supply

Patent metadata

Field	Value
Publication number	US-2023078710-A1
Application number	US-202217650774-A
Country	US
Kind code	A1
Filing date	Feb 11, 2022
Priority date	Sep 15, 2021
Publication date	Mar 16, 2023
Grant date	—

Abstract

According to one embodiment, a secondary battery is provided. The secondary battery includes a first electrode having a first current collector, second electrode having a second current collector, and an aqueous electrolyte. The first electrode includes a first lead, and a first joint for electrically connecting the first current collector and the first lead. At least a part of the surface of the first current collector has a first current collector coating. At least a part of the surface of the first lead has a first lead coating. The thickness of the first lead coating is larger than the thickness of the first current collector coating.

First claim

What is claimed is:

1 . A secondary battery comprising:
a first electrode comprising a first current collector; a second electrode comprising a second current collector; and an aqueous electrolyte, wherein the first electrode comprises a first lead, and a first joint for electrically connecting the first current collector and the first lead, the second electrode comprises a second lead, and a second joint for electrically connecting the second current collector and the second lead, the first electrode is one of a positive electrode and a negative electrode, the second electrode is the other of the positive electrode and the negative electrode, at least a part of a surface of the first current collector has a first current collector coating, at least a part of a surface of the first lead has a first lead coating, each of the first current collector and the first lead comprises at least one selected from the group consisting of aluminum, aluminum alloys, copper, and nickel, each of the first lead coating and the first current collector coating comprises at least one selected from the group consisting of aluminum oxide, aluminum oxyhydroxide, chromium-containing compounds, and zinc-containing compounds, at least a part of a surface of the second current collector has a second current collector coating, at least a part of a surface of the second lead has a second lead coating, each of the second current collector and the second lead comprises at least one selected from the group consisting of aluminum, aluminum alloys, copper, and nickel, each of the second lead coating and the second current collector coating comprises at least one selected from the group consisting of aluminum oxide, aluminum oxyhydroxide, chromium-containing compounds, and zinc-containing compounds, and the thickness of the first lead coating is larger than the thickness of the first current collector coating.

2 . The secondary battery according to claim 1 , wherein the thickness of the second lead coating is larger than the thickness of the second current collector coating.

3 . The secondary battery according to claim 1 , wherein the thickness of the first current collector coating is in the range of 1 μm or more and 10 μm or less.

4 . The secondary battery according to claim 1 , wherein the thickness of the first lead coating is in the range of 2 μm or more and 100 μm or less.

5 . The secondary battery according to claim 1 , wherein
at least a part of the first joint is covered with a water-repellent member, and the water-repellent member comprises at least one water-repellent material selected from the group consisting of polytetrafluoroethylene, tetrafluoroethylene-fluorinated propylene copolymer, polypropylene, polyethylene, polyimide, polystyrene, silicone, and epoxy resin.

6 . The secondary battery according to claim 1 , wherein
the negative electrode comprises a negative electrode active material-containing layer comprising a negative electrode active material, and the negative electrode active material comprises at least one titanium-containing oxide selected from the group consisting of titanium oxide, lithium titanium composite oxide, niobium titanium composite oxide, and sodium niobium titanium composite oxide.

7 . A battery pack comprising the secondary battery according to claim 1 .

8 . The battery pack according to claim 7 , further comprising:
an external power distribution terminal; and a protective circuit.

9 . The battery pack according to claim 7 , comprising a plurality of the secondary battery, wherein
the secondary batteries are electrically connected in series or parallel to one another, or in series and parallel to one another.

10 . A vehicle comprising the battery pack according to claim 7 .

11 . A stationary power supply comprising the battery pack according to claim 7 .

Assignees

• Toshiba Kk

Inventors

• Hoshina Keigo
• Sekiguchi Yumiko
• Hotta Yasuyuki
• Matsuno Shinsuke
• Takami Norio

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M50/54 Primary

  Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges · CPC title

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M50/543

  Terminals · CPC title