Patent ID: 11929478
Assignee: MITSUBISHI CHEMICAL CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A filling member to be interposed between pouch cells of a battery pack,
the filling member having a first surface orthogonal to a thickness direction thereof and a second surface opposite to the first surface,
wherein θd1 and θd2 defined below satisfy formulas (1) and (2) below, respectively, wherein θp satisfies formula (3) below, and wherein θd1>θd2 holds:

θd1≥3.0×10−3 (m2·K)/W,  (1)

θd2≤8.0×10−3 (m2·K)/W,  (2)

0.5 K/W≤θp1≤1000 K/W,  (3)

0.5 K/W≤θp2≤1000 K/W,  (4)

θd1: a heat transfer resistance per unit area in the thickness direction when the average temperature of one of the first and second surfaces exceeds 180° C.,
θd2: a heat transfer resistance per unit area in the thickness direction when the average temperatures of the first and second surfaces both do not exceed 80° C.,
θp1: a heat transfer resistance in a plane direction when the average temperature of one of the first and second surfaces exceeds 180° C.,
θp2: a heat transfer resistance in the plane direction when the average temperatures of the first and second surfaces both do not exceed 80° C.,
wherein the filling member comprises a partition member and a heat transfer sheet,
wherein, when the average temperature of one of the first and second surfaces exceeds 180° C., the thermal conductivity of the partition member in the thickness direction is from 2.0×10−2 W/m·K to 2.0 W/m·K inclusive,
wherein, when the average temperatures of the first and second surfaces both do not exceed 80° C., the thermal conductivity of the partition member in the thickness direction is from 5.0×10−2 W/m·K to 5.0×101 W/m·K inclusive, and
wherein the thermal conductivity of the heat transfer sheet in the plane direction is from 1.0×101 W/m·K to 2.0×103 W/m·K inclusive, irrespective of the temperature of the partition member.