Battery cell and manufacturing method thereof
A battery cell includes an electrode assembly; a case comprising an accommodation portion accommodating the electrode assembly and a sealing portion formed on a periphery of the accommodation portion; and a fixing member disposed between the accommodation portion and the sealing portion to adhere each other; wherein the fixing member comprises a core layer, and an adhesive layer is stacked on both surfaces of the core layer.
1. A battery cell, comprising:
an electrode assembly;
a case comprising an accommodation portion accommodating the electrode assembly and a sealing portion formed on a periphery of the accommodation portion; and
a fixing member disposed between the accommodation portion and the sealing portion to adhere each other;
wherein the fixing member comprises a core layer, and an adhesive layer is stacked on both surfaces of the core layer,
wherein the core layer is formed of a material having a lower elongation percentage compared to the adhesive layer,
wherein a thickness of the fixing member is formed to be 100 μm to 300 μm, and a thickness of the adhesive layer is formed to be at least twice greater than a thickness of the core layer,
wherein the fixing member is melted at 100° C. to 150° C.,
wherein the fixing member has an elongation percentage of 20% or less, and
wherein the fixing member has a tensile strength of 30 N/m 2 to 45 N/m 2 .
2. The battery cell of claim 1 , wherein the sealing portion is bent at least once to be adhered to the accommodation portion.
3. The battery cell of claim 1 , wherein the case is formed of a polyethylene terephthalate (PET), and the adhesive layer is formed of a polyurethane-based resin.
4. The battery cell of claim 3 , wherein the core layer is formed of PET.