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

Patent metadata

Field	Value
Publication number	US-2023088781-A1
Application number	US-202217651681-A
Country	US
Kind code	A1
Filing date	Feb 18, 2022
Priority date	Sep 15, 2021
Publication date	Mar 23, 2023
Grant date	—

Abstract

According to one embodiment, a secondary battery includes positive electrodes, negative electrodes, a separator, a positive electrode lead, a negative electrode lead, and an aqueous electrolyte. The positive electrodes each include a positive electrode current collector and a positive electrode tab. The positive electrode current collector includes a first polymeric material. The negative electrodes each include a negative electrode current collector and a negative electrode tab. The negative electrode current collector includes a second polymeric material. At least a portion of the positive electrode tab is in direct contact with the positive electrode lead. At least a portion of the negative electrode tab is in direct contact with the negative electrode lead.

First claim

1 . A secondary battery comprising:
positive electrodes each comprising: a positive electrode current collector; a positive electrode tab extending, along a first direction, from at least one portion of an edge of the positive electrode current collector; and a positive electrode active material-containing layer provided on at least a portion of a surface of the positive electrode current collector, and the positive electrode current collector comprising a first conductive material and a first polymeric material; negative electrodes each comprising: a negative electrode current collector; a negative electrode tab extending, along a second direction, from at least one portion of an edge of the negative electrode current collector; and a negative electrode active material-containing layer provided on at least a portion of a surface of the negative electrode current collector, and the negative electrode current collector comprising a second conductive material and a second polymeric material; a separator between the positive electrodes and the negative electrodes; a positive electrode lead with which at least a portion of the positive electrode tab of each of the positive electrodes is in direct contact; a negative electrode lead with which at least a portion of the negative electrode tab of each of the negative electrodes is in direct contact; and an aqueous electrolyte.

2 . The secondary battery according to claim 1 , wherein
the positive electrode tab comprises extending portions extending, along the first direction, from portions of the edge of the positive electrode current collector, at least one of the extending portions of the positive electrode tab of each of the positive electrodes is in direct contact with the positive electrode lead, the negative electrode tab comprises extending portions extending, along the second direction, from portions of the edge of the negative electrode current collector, and at least one of the extending portions of the negative electrode tab of each of the negative electrodes is in direct contact with the negative electrode lead.

3 . The secondary battery according to claim 1 , wherein
at least a portion of the positive electrode tab of one positive electrode of the positive electrodes is in direct contact with the positive electrode lead, at least a portion of the positive electrode tab of another positive electrode of the positive electrodes is in direct contact with the positive electrode lead, a connecting portion is provided between the positive electrode tab of the one positive electrode on the positive electrode lead and the positive electrode tab of the another positive electrode on the positive electrode lead, the connecting portion electrically connecting the positive electrode tab of the one positive electrode and the positive electrode tab of the another positive electrode, at least a portion of the negative electrode tab of one negative electrode of the negative electrodes is in direct contact with the negative electrode lead, at least a portion of the negative electrode tab of another negative electrode of the negative electrodes is in direct contact with the negative electrode lead, and a connecting portion is provided between the negative electrode tab of the one negative electrode on the negative electrode lead and the negative electrode tab of the another negative electrode on the negative electrode lead, the connecting portion electrically connecting the negative electrode tab of the one negative electrode and the negative electrode tab of the another negative electrode.

4 . The secondary battery according to claim 1 , wherein
the positive electrode tab of each of one positive electrode and another positive electrode of the positive electrodes comprises extending portions extending, along the first direction, from portions of the edge of the positive electrode current collector, at least one of the extending portions of the positive electrode tab of the one positive electrode is in direct contact with the positive electrode lead; at least one of the extending portions of the positive electrode tab of the another positive electrode is in direct contact with the positive electrode lead, a connecting portion is provided between the extending portions of the one positive electrode on the positive electrode lead and the extending portions of the another positive electrode on the positive electrode lead, the connecting portion electrically connecting the extending portions of the one positive electrode and the extending portions of the another positive electrode, the negative electrode tab of each of one negative electrode and another negative electrode of the negative electrodes comprises extending portions extending, along the second direction, from portions of the edge of the negative electrode current collector, at least one of the extending portions of the negative electrode tab of the one negative electrode is in direct contact with the negative electrode lead, at least one of the extending portions of the negative electrode tab of the another negative electrode is in direct contact with the negative electrode lead, and a connecting portion is provided between the extending portions of the one negative electrode on the negative electrode lead and the extending portions of the another negative electrode on the negative electrode lead, the connecting portion electrically connecting the extending portions of the one negative electrode and the extending portions of the another negative electrode.

5 . The secondary battery according to claim 3 , wherein the connecting portion is formed by at least one selected from contact, thermal fusion bonding, and a conductive adhesive.

6 . The secondary battery according to claim 1 , wherein
the positive electrode current collector is a conductive resin sheet comprising: a matrix component made of the first polymeric material; and a filler mixed in the matrix component and made of the first conductive material; and the negative electrode current collector is a conductive resin sheet comprising: a matrix component made of the second polymeric material; and a filler mixed in the matrix component and made of the second conductive material.

7 . The secondary battery according to claim 1 , wherein the positive electrode lead either comprises at least one selected from the group consisting of Ti, stainless steel, Al, and a carbonaceous material, or is formed of a same material as a material of the positive electrode current collector.

8 . The secondary battery according to claim 1 , wherein the negative electrode lead either comprises at least one selected from the group consisting of Al, Zn, Sn, Ni, Cu, and a carbonaceous material, or is formed of a same material as a material of the negative electrode current collector.

9 . The secondary battery according to claim 1 , wherein the negative electrode active material-containing layer comprises a niobium titanium composite oxide.

10 . The secondary battery according to claim 1 , wherein the aqueous electrolyte comprises an aqueous solvent and alkali metal ions.

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

12 . The battery pack according to claim 11 further comprising an external power distribution terminal and a protective circuit.

13 . The battery pack according to claim 11 , comprising a plurality of the secondary battery,
wherein the secondary batteries are electrically connected in series, in parallel, or in a combination of in-series connection and in-parallel connection.

14 . A vehicle comprising the secondary battery according to

Assignees

• Toshiba Kk

Inventors

• Hoshina Keigo
• Hotta Yasuyuki
• Yoshima Kazuomi
• Matsuno Shinsuke
• Takami Norio

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2220/10

  Batteries in stationary systems, e.g. emergency power source in plant · 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

• H01M50/534 Primary

  characterised by the material of the leads or tabs · CPC title