Secondary battery, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-2023197931-A1
Application number	US-202217822605-A
Country	US
Kind code	A1
Filing date	Aug 26, 2022
Priority date	Dec 22, 2021
Publication date	Jun 22, 2023
Grant date	—

Abstract

According to one embodiment, a secondary battery including a negative electrode. The negative electrode includes a negative electrode current collector and a negative electrode mixture layer. A thickness of the negative electrode current collector is in a range of 8 μm to 18 μm. The negative electrode current collector includes a first current collector end surface extending along a stacking direction. The negative electrode mixture layer includes a niobium-titanium composite oxide, and a first protrusion protruding from the first current collector end surface along a first direction orthogonal to the stacking direction. A protrusion length A1 of the first protrusion satisfies 0 mm<A1≤1.0 mm.

First claim

What is claimed is:

1 . A secondary battery comprising:
a negative electrode comprising a negative electrode current collector and a negative electrode mixture layer stacked on the negative electrode current collector and having a front surface and a back surface; a positive electrode; and an electrolyte, wherein a thickness of the negative electrode current collector is in a range of 8 μm to 18 μm, and the negative electrode current collector comprises a first current collector end surface extending along a stacking direction in which the negative electrode mixture layer is stacked on the negative electrode current collector, and the negative electrode mixture layer comprises a niobium-titanium composite oxide as a negative electrode active material, and a first protrusion protruding from the first current collector end surface along a first direction orthogonal to the stacking direction, and a protrusion length A 1 of the first protrusion satisfies 0 mm<A 1 ≤1.0 mm.

2 . The secondary battery according to claim 1 , wherein at least a part of the first protrusion has a round shape.

3 . The secondary battery according to claim 1 , wherein
both the negative electrode current collector and the negative electrode mixture layer have a rectangular shape, and the first current collector end surface is one of a long side end surface and a short side end surface of the negative electrode current collector, and the negative electrode current collector further comprises a second current collector end surface which is the other of the long side end surface and the short side end surface of the negative electrode current collector, and the negative electrode mixture layer comprises a second protrusion protruding from the second current collector end surface along a second direction orthogonal to the stacking direction, and a protrusion length A 2 of the second protrusion satisfies 0 mm<A 2 ≤1.0 mm.

4 . The secondary battery according to claim 1 , wherein a ratio A 1 /tE of the protrusion length A 1 of the first protrusion to a thickness tE of the negative electrode current collector is in a range of 5 to 100.

5 . The secondary battery according to claim 1 , wherein an electrode density of the negative electrode mixture layer is in a range of 2.1 g/cm 3 to 3.0 g/cm 3 .

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

7 . The battery pack according to claim 6 , further comprising an external power distribution terminal and a protective circuit.

8 . The battery pack according to claim 6 , comprising a plurality of the secondary battery, wherein
the secondary batteries are electrically connected in series, in parallel, or in combination of series and parallel.

9 . A vehicle comprising the battery pack according to claim 6 .

10 . The vehicle according to claim 9 , comprising a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

Assignees

• Toshiba Kk

Inventors

• Kanai Yuta
• Sasakawa Tetsuya
• Yoshima Kazuomi
• Sugizaki Tomoko
• Yamashita Yasunobu
• Ise Kazuki
• Fukaya Taro
• Takami Norio
• Harada Yasuhiro
• Hoshina Keigo

Classifications

• H01M2220/20

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

• H01M4/364 Primary

  as mixtures · CPC title

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/425

  Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00) · CPC title

• H01M2004/027

  Negative electrodes · CPC title