Seal for electrochemical cell

An electrochemical cell comprising a container with an open end;

• a negative electrode, a positive electrode and an electrolyte disposed within the housing;
• and a seal member disposed in the open end of the container for closing the cell, thereby sealing the electrodes and the electrolyte within the container;
• wherein the seal member comprises an injection-molded thermoplastic material, the thermoplastic material comprising a mixture of:
• a polyolefin matrix comprising more than 30 weight percent of the thermoplastic material;
• and
• an aromatic polymer having a repeating unit that comprises at least one aromatic functional group;
• wherein the thermoplastic material has a heat deflection temperature at 66 psi of 200° F. to 400° F., as determined by ASTM D648.

An electrochemical cell comprising a metal container and an injection-molded thermoplastic seal member forming a compressive seal, wherein the seal member has:

• a tensile creep deformation, between 1 and 1000 hours at 114° F. under a constant load of 1500 psi, of 0 to 3 percent, as determined by ASTM D2990;
• a tensile modulus at 50% RH and 23° C. of 120,000 to 300,000 psi, as determined by ASTM D638;
• a coefficient of thermal expansion in the direction of flow at 50% RH and 73° F. of 0.000020 to 0.000060 in./in.-° F., as determined by ASTM E831;
• and
• a heat deflection temperature, dry as molded, at 66 psi of 230° F. to 400° F., as determined by ASTM D648.