US 12,034,178 B2
Battery module including pressure drop sheet
Tae Il Kim, Daejeon (KR); Seo Roh Rhee, Daejeon (KR); and Ju Young Jeong, Daejeon (KR)
Assigned to SK ON CO., LTD., Seoul (KR)
Filed by SK On Co., Ltd., Seoul (KR)
Filed on Jan. 10, 2023, as Appl. No. 18/095,427.
Claims priority of application No. 10-2022-0006090 (KR), filed on Jan. 14, 2022.
Prior Publication US 2023/0231269 A1, Jul. 20, 2023
Int. Cl. H01M 50/211 (2021.01); H01M 50/30 (2021.01); H01M 50/375 (2021.01)
CPC H01M 50/394 (2021.01) [H01M 50/211 (2021.01); H01M 50/375 (2021.01)] 15 Claims
OG exemplary drawing
 
1. A battery module, comprising:
a battery cell stack in which a plurality of battery cells are stacked; and
a pressure drop sheet on one side of the battery cell stack,
wherein the pressure drop sheet includes a ventilation layer, and a sacrificial layer on at least one surface of the ventilation layer,
wherein the pressure drop sheet exhibits, at a critical temperature, permeability to gas, wherein the gas is generated and the critical temperature is reached due to heat generation by at least one of the plurality of battery cells,
wherein the ventilation layer maintains a breathable structure at the critical temperature and includes a ceramic fiber having about 45 to 75 wt % of alumina and about 25 to 55 wt % of silica, and wherein the sacrificial layer directly faces the battery cell stack, is directly exposed to the heat generation by at least one of the plurality of battery cells, and is lost at the critical temperature.