A battery module that comprises an electrochemical cell is provided. The battery module includes a polymer composition that comprises a polymer matrix that includes a thermotropic liquid crystalline polymer and a thermally conductive filler distributed within the polymer matrix. The polymer composition exhibits an in-plane thermal conductivity of about 3 W/m-K or more as determined in accordance with ASTM E1461-13 (2022) and a deflection temperature under load of about 230 C.) or more as determined in accordance with ISO 75:2013 at a load of 1.8 MPa.