Battery pack comprising fire extinguishing unit

Patent metadata

Field	Value
Publication number	US-2022359947-A1
Application number	US-202017640741-A
Country	US
Kind code	A1
Filing date	Aug 19, 2020
Priority date	Sep 5, 2019
Publication date	Nov 10, 2022
Grant date	—

Abstract

A battery pack includes at least two battery modules arranged in one direction; and a fire extinguishing unit extinguisher having a fire extinguishing tank configured to contain a fire extinguishing agent therein, a pipe connected to the fire extinguishing tank to supply the fire extinguishing agent from the fire extinguishing tank to each of the at least two battery modules, a flow rate adjuster provided to the pipe and configured to adjust a feed flow rate of the fire extinguishing agent to be constant, and at least one valve configured to supply the fire extinguishing agent from the fire extinguishing tank to the battery module having an internal temperature rising over a predetermined temperature.

First claim

1 . A battery pack, comprising:
at least two battery modules arranged in one direction; and a fire extinguisher comprising:
a fire extinguishing tank configured to contain a fire extinguishing agent;
a pipe connected to the fire extinguishing tank to supply the fire extinguishing agent from the fire extinguishing tank to each of the at least two battery modules;
a flow rate adjuster provided to the pipe and configured to adjust a feed flow rate of the fire extinguishing agent to be constant, and
at least one valve configured to supply the fire extinguishing agent from the fire extinguishing tank to a battery module of the at least two battery modules having an internal temperature rising over a predetermined temperature.

2 . The battery pack according to claim 1 , wherein the pipe includes a common pipe connected to an outlet hole of the fire extinguishing tank through which the fire extinguishing agent is output, and at least two distribution pipes diverging from the common pipe, and
wherein the flow rate adjuster is provided at the common pipe.

3 . The battery pack according to claim 2 , wherein the flow rate adjuster includes at least one decompression valve configured to reduce a feed pressure of the fire extinguishing agent to a predetermined pressure or below.

4 . The battery pack according to claim 2 , wherein a passive valve is provided at a distal end of the distribution pipe in a direction along which the fire extinguishing agent moves, so that the passive valve is opened to inject the fire extinguishing agent into the battery module when the battery module is heated over the predetermined temperature.

5 . The battery pack according to claim 4 , wherein each of the at least two battery modules has a gas passage through which gas generated in the battery module moves, and an inlet hole connected to the gas passage so that the inside of the battery module communicates with the outside, and
wherein at least a part of the passive valve is inserted into the battery module through the inlet hole.

6 . The battery pack according to claim 2 , wherein the at least two distribution pipes are configured to have different pipe diameters.

7 . The battery pack according to claim 6 , wherein among the at least two distribution pipes, a distribution pipe diverging at a location relatively closer to the outlet hole has a smaller pipe diameter compared to the remaining distribution pipe.

8 . A battery rack, comprising:
a battery pack according to claim 1 ; and a rack case configured to accommodate the battery pack.

9 . An energy storage system, comprising two or more battery racks according to claim 8 .

10 . The energy storage system according to claim 9 , wherein the pipe provided to the fire extinguisher of the battery rack includes a common pipe connected to an outlet hole of the fire extinguishing tank through which the fire extinguishing agent is output, and at least two parallel pipes diverging from the common pipe to each of the two or more battery racks, and
wherein the flow rate adjuster is provided to at least a part of the at least two parallel pipes.

Assignees

• Lg Energy Solution Ltd

Inventors

• Lee Jin-Kyu
• Jung Goan-Su

Classifications

• H01M50/20

  Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders (structural combination of accumulators with charging apparatus H01M10/46) · CPC title

• H01M2200/00

  Safety devices for primary or secondary batteries · CPC title

• H01M10/613

  Cooling or keeping cold · CPC title

• H01M10/486

  for measuring temperature · CPC title

• H01M10/627

  Stationary installations, e.g. power plant buffering or backup power supplies · CPC title