Battery module having structure capable of delaying outflow of fire-fighting water injected therein in case of fire, and battery rack and energy storage device comprising same

Patent metadata

Field	Value
Publication number	US-2022263192-A1
Application number	US-202117628828-A
Country	US
Kind code	A1
Filing date	Feb 3, 2021
Priority date	Feb 17, 2020
Publication date	Aug 18, 2022
Grant date	—

Abstract

A battery module includes a cell stack including a plurality of battery cells stacked in a direction, a module housing having an internal space in which the cell stack is received and an air inlet and an air outlet through which air enters and exits, a valve installation hole formed through a side wall of the module housing, a feed valve nozzle installed at the valve installation hole facing the internal space of the module housing, and a water expandable member provided in the module housing. The water expandable member expands in volume when it absorbs water during operation of the feed valve nozzle to close at least one of the air inlet, the air outlet or the valve installation hole.

First claim

1 . A battery module, comprising:
a cell stack including a plurality of battery cells stacked in a direction; a module housing having an internal space in which the cell stack is received and an air inlet and an air outlet through which air enters and exits; a valve installation hole formed through a side wall of the module housing; a feed valve nozzle disposed facing the internal space of the module housing at a location of the valve installation hole; and an expandable member provided in the module housing, wherein the expandable member absorbs fluid to expand in volume during operation of the feed valve nozzle to close at least one of the air inlet, the air outlet or the valve installation hole.

2 . The battery module according to claim 1 , wherein the expandable member includes:
a nonwoven fabric holder comprising a frame having a space inside an edge and fixed and coupled to an inner surface of the module housing having the air inlet, the air outlet or the valve installation hole; and a superabsorbent nonwoven fabric attached to an inner surface of the nonwoven fabric holder.

3 . The battery module according to claim 2 , wherein the frame is a rectangular frame, and the superabsorbent nonwoven fabric is attached to each of a left side wall and a right side wall of the nonwoven fabric holder.

4 . The battery module according to claim 2 , wherein the space of the nonwoven fabric holder is in communication with the air inlet, the air outlet or the valve installation hole.

5 . The battery module according to claim 2 , wherein the edge of the nonwoven fabric holder surrounds the air inlet, the air outlet or the valve installation hole and is in contact with the inner surface of the module housing.

6 . The battery module according to claim 2 , wherein the expandable member further includes a mesh coupled to the nonwoven fabric holder to cover at least one of a front side or a rear side of the space of the frame.

7 . The battery module according to claim 1 , wherein the feed valve nozzle includes a glass bulb which blocks a channel through which the fluid will be forced out, and
wherein the glass bulb receives a liquid therein and is configured to break by volume expansion of the liquid at a predetermined temperature or above.

8 . The battery module according to claim 1 , wherein the feed valve nozzle is inserted into the module housing through the valve installation hole.

9 . The battery module according to claim 1 , wherein the feed valve nozzle is disposed in the module housing integrally with the module housing, and
wherein a diameter of the valve installation hole corresponds to a diameter of a rear end of the feed valve nozzle.

10 . A battery rack, comprising:
a rack housing; a plurality of battery modules according to claim 1 , arranged on top of one another in the rack housing; a water tank disposed in the rack housing or near the rack housing; a pipe connecting the water tank to each battery module of the plurality of battery modules; at least one sensor installed in the rack housing to detect thermal runaway occurring in at least one of the plurality of battery modules; and a controller to output a control signal for feeding fluid into the battery module through the pipe when the thermal runaway is detected by the at least one sensor.

11 . The battery rack according to claim 10 , further comprising:
a plurality of control valves installed in the pipe, wherein each of the plurality of control valves is installed near a respective one of the plurality of battery modules to individually allow or disallow a flow of the fluid fed into the plurality of battery modules, wherein the at least one sensor is installed in each of the plurality of battery modules, and wherein the controller outputs the control signal for opening the control valve installed near the battery module in which the thermal runaway was detected by the at least one sensor among the plurality of control valves.

12 . An energy storage system comprising at least one battery rack according to claim 10 .

Assignees

• Lg Energy Solution Ltd

Inventors

• Lee Young-Seok
• Jo Sang-Hyun
• Bae Kyung-Hyun
• Shin Jin-Kyu
• Lee Jin-Kyu

Classifications

• H01M2200/10

  Temperature sensitive devices · CPC title

• H01M10/6561

  Gases · CPC title

• H01M50/636

  Closing or sealing filling ports, e.g. using lids · CPC title

• H01M50/24 Primary

  adapted for protecting batteries from their environment, e.g. from corrosion (thermal insulation H01M10/658) · CPC title

• H01M50/204

  Racks, modules or packs for multiple batteries or multiple cells · CPC title