Battery module comprising thermal barrier and pack
The present disclosure relates to a high voltage battery module and a pack, in which a thermal barrier is mounted, and, more particularly, relates to a battery module comprising a cell assembly stacked with a plurality of secondary battery cell; a housing accommodating the cell assembly, a thermal barrier is placed in the housing, wherein the thermal barrier comprises a heat resistant layer to prevent propagation of heat or flame from a secondary battery cell to an neighboring secondary battery cell.
1. A battery module comprising a cell assembly stacked with a plurality of secondary battery cell; a housing accommodating the cell assembly,
a thermal barrier is placed in the housing,
wherein the thermal barrier comprises a first heat resistant layer, a second heat resistant layer, and a rigid mechanical layer disposed between the first and second heat resistant layers,
wherein the heat resistant layers include at least one mica sheet comprising mica, and the at least one mica sheet directly faces one of the plurality of secondary battery cells.
2. The battery module of claim 1 , wherein the secondary battery cell is a pouch-type secondary battery cell in which an electrode assembly is accommodated in a pouch case.
3. The battery module of claim 1 , wherein the mica sheet comprises mica in an amount of 90% to 99% by weight and a binder in an amount of 1% to 10% by weight.
4. The battery module of claim 1 , wherein each of the first and second heat resistant layers has a thickness of 0.2 to 3.0 mm.
5. The battery module of claim 1 , wherein the rigid mechanical layer is at least one of a film, a woven fabric, a non-woven fabric, or a foam, and is made of a material selected from at least one of plastic, steel, ceramic, super wool, and silicone, having a melting point of 150° C. or higher, and
wherein the rigid mechanical layer is spaced apart from the battery cell.
6. The battery module of claim 5 , wherein the plastic is at least one selected from polyethylene terephthalate (PET), polyimide, fluororesin, or carbon-fiber-reinforced-polymers (CFRP) in which a carbon fiber is included in any one thereof.
7. The battery module of claim 1 , wherein the rigid mechanical layer has a thickness of 0.1 to 1.0 mm.
8. The battery module of claim 1 , wherein the thermal barrier has a thickness of 1.0 to 4.0 mm.
9. The battery module of claim 1 , further comprising an adhesive layer between the rigid mechanical layer and the first and second heat resistant layers, or in an outermost portion of the thermal barrier.
10. The battery module of claim 9 , wherein the adhesive layer is a pressure sensitive adhesive or a hot melt adhesive made of a silicone-based adhesive, an acrylic-based adhesive, a rubber-based adhesive, or an epoxy-based adhesive.
11. The battery module of claim 1 , further comprising a pad layer preventing swelling of the secondary battery cells,
wherein the pad layer is disposed between the rigid mechanical layer and the heat resistant layers, and
the pad layer comprises a material different from at least one of the rigid mechanical layer and the heat-resistant layer.
12. The battery module of claim 11 , wherein the pad layer has a compressibility of 20 to 50% in a thickness direction of the pad layer.
13. The battery module of claim 1 , wherein the thermal barrier is located in at least one of the following
i) between one secondary battery cell among the plurality of secondary battery cells accommodated in the housing and a neighboring secondary battery cell adjacent thereto;
ii) between a cell tab of the one secondary battery cell and a cell tab of the neighboring secondary battery cell; and
iii) in an upper space of the housing above the plurality of secondary battery cells accommodated in the housing.
14. A pack comprising the battery module of claim 13 .