Pouch film laminate, pouch type battery case, and pouch type secondary battery
AssigneeLG Energy Solution, Ltd.
InventorsSang Hun Kim, Min Hyeong Kang, Hyung Kyun Yu, Soo Ji Hwang
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Abstract
A pouch film laminate for preparing a pouch type battery case accommodating an electrode assembly is provided. The pouch film laminate includes a sealant layer formed of a first polymer as an innermost layer, a surface protection layer formed of a second polymer as an outermost layer, an aluminum alloy thin film having a grain size of 10 μm to 13 μm, and a gas barrier layer laminated between the surface protection layer and the sealant layer, wherein the gas barrier layer has a thickness of 50 μm to 70 μm, and the sealant layer has a thickness of 70 μm to 100 μm.
Claims17
A pouch film laminate comprising:
- a sealant layer formed of a first polymer as an innermost layer;
- a surface protection layer formed of a second polymer as an outermost layer;
- a gas barrier layer laminated between the surface protection layer and the sealant layer;
- and
- a drawing assistance layer formed of a third polymer and laminated between the surface protection layer and the gas barrier layer,
- wherein the gas barrier layer has a thickness of 50 μm to 70 μm,
- wherein the gas barrier layer comprises an aluminum alloy thin film,
- wherein the sealant layer has a thickness of 70 μm to 100 μm, and
- wherein a thickness ratio of the drawing assistance layer to the gas barrier layer is in a range of 1:1.5 to 1:2.5.
A pouch type battery case accommodating an electrode assembly and being prepared by forming a pouch film laminate,
- wherein the pouch film laminate comprises:
- a sealant layer formed of a first polymer as an innermost layer;
- a surface protection layer formed of a second polymer as an outermost layer;
- a gas barrier layer laminated between the surface protection layer and the sealant layer;
- and
- a drawing assistance layer formed of a third polymer and laminated between the surface protection layer and the gas barrier layer,
- wherein the gas barrier layer has a thickness of 50 μm to 70 μm,
- wherein the gas barrier layer comprises an aluminum alloy thin film,
- wherein the sealant layer has a thickness of 70 μm to 100 μm, and
- wherein a thickness ratio of the drawing assistance layer to the gas barrier layer is in a range of 1:1.5 to 1:2.5.
A pouch type secondary battery comprising an electrode assembly which is formed by stacking a positive electrode, a separator, and a negative electrode;
- and
- a pouch type battery case accommodating the electrode assembly,
- wherein the battery case is prepared by forming a pouch film laminate,
- wherein the pouch film laminate comprises:
- a sealant layer formed of a first polymer as an innermost layer;
- a surface protection layer formed of a second polymer as an outermost layer;
- a gas barrier layer laminated between the surface protection layer and the sealant layer;
- and
- a drawing assistance layer formed of a third polymer and laminated between the surface protection layer and the gas barrier layer,
- wherein the gas barrier layer has a thickness of 50 μm to 70 μm,
- wherein the gas barrier layer comprises an aluminum alloy thin film,
- wherein the sealant layer has a thickness of 70 μm to 100 μm, and
- wherein a thickness ratio of the drawing assistance layer to the gas barrier layer is in a range of 1:1.5 to 1:2.5.
Dependencies are inferred from the claim text.