Battery unit, battery module, and battery pack

Patent metadata

Field	Value
Publication number	US-2021384585-A1
Application number	US-202117308496-A
Country	US
Kind code	A1
Filing date	May 5, 2021
Priority date	Jun 4, 2020
Publication date	Dec 9, 2021
Grant date	—

Abstract

A battery unit includes a secondary battery, a first trap, and a second trap. The secondary battery includes a battery case provided with a gas vent valve, and an electrolyte solution enclosed in the battery case. The first trap includes a mesh material disposed outside the battery case so as to oppose and cover the gas vent valve. The second trap includes a liquid retaining material made of a non-flammable material and disposed further outward of the first trap so as to oppose and cover the gas vent valve.

First claim

1 . A battery unit comprising:
a secondary battery; a first trap; and a second trap, wherein: the secondary battery includes:
a battery case including a gas vent valve; and
an electrolyte solution enclosed in the battery case;
the first trap includes a mesh material disposed outside the battery case so as to oppose and cover the gas vent valve; and the second trap includes a liquid retaining material made of a non-flammable material and disposed further outward of the first trap so as to oppose and cover the gas vent valve.

2 . The battery unit according to claim 1 , wherein the first trap has an aperture ratio of from 25% to 75%.

3 . The battery unit according to claim 1 , wherein the second trap includes one of a spongy material, a mineral wool material, a diatomaceous earth, and a fibrous material.

4 . The battery unit according to claim 1 , wherein the first trap is disposed away from the gas vent valve.

5 . The battery unit according to claim 1 , wherein the second trap is disposed away from the first trap.

6 . The battery unit according to claim 1 , wherein the first trap is supported on the battery case or the second trap.

7 . The battery unit according to claim 1 , wherein the second trap is supported on the first trap or the battery case.

8 . A battery module comprising:
a plurality of secondary batteries; a restraining member; bus bars; a first trap; and a second trap, wherein: each of the secondary batteries includes:
a battery case including a gas vent valve;
an electrolyte solution enclosed in the battery case;
a positive electrode terminal disposed on a side surface of the battery case; and
a negative electrode terminal disposed on the side surface of the battery case;
the restraining member restrains the plurality of secondary batteries in a predetermined arrangement; each of the bus bars connects a positive electrode terminal and a negative electrode terminal between the plurality of secondary batteries; the first trap includes a mesh material disposed outside the battery case of each of the plurality of secondary batteries so as to oppose and cover the gas vent valve of each of the plurality of secondary batteries; and the second trap includes a liquid retaining material made of a non-flammable material and disposed further outward of the first trap so as to oppose and cover the gas vent valve of each of the plurality of secondary batteries.

9 . The battery module according to claim 8 , wherein the first trap has an aperture ratio of from 25% to 75%.

10 . The battery module according to claim 8 , wherein the second trap includes one of a spongy material, a mineral wool material, a diatomaceous earth, and a fibrous material.

11 . The battery module according to claim 8 , wherein the first trap is disposed away from the gas vent valve of each of the plurality of secondary batteries.

12 . The battery module according to claim 8 , wherein the second trap is disposed away from the first trap.

13 . The battery module according to claim 8 , wherein the first trap is supported on at least one of the restraining member, the bus bars, the second trap, and any of the battery cases of the plurality of secondary batteries.

14 . The battery module according to claim 8 , wherein the second trap may be supported on at least one of the first trap, the restraining member, the bus bars, and any of the battery cases of the plurality of secondary batteries.

15 . A battery pack comprising:
one or more battery modules according to claim 8 ; and a pack case enclosing the one or more battery modules in a predetermined arrangement.

16 . The battery pack according to claim 15 , wherein the first trap is supported on at least one of the restraining member, the bus bars, the pack case, the second trap, and any of the battery cases of the plurality of secondary batteries.

17 . The battery pack according to claim 15 , wherein the second trap is supported on at least one of the restraining member, the bus bars, the first trap, and any of the battery cases of the plurality of secondary batteries.

Assignees

• Toyota Motor Co Ltd

Inventors

• Ando Sho

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M50/209

  adapted for prismatic or rectangular cells (H01M50/216 takes precedence) · CPC title

• H01M50/3425

  in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member · CPC title

• H01M50/383 Primary

  Flame arresting or ignition-preventing means · CPC title

• H01M50/258

  Modular batteries; Casings provided with means for assembling · CPC title