Rechargeable battery with electrolyte injection opening sealing member

Abstract

A rechargeable battery having an electrolyte sealing member covering and sealing the electrolyte injection opening. An electrode assembly includes a positive electrode, a negative electrode and a separator wound in a jelly roll configuration. A case houses the electrode assembly. A cap assembly is combined with the case to seal the case, the cap assembly including a positive terminal connected to the positive electrode and a negative terminal connected to the negative electrode. An electrolyte injection opening is formed on the case or the cap assembly. A groove is formed along a periphery of the electrolyte injection opening. An electrolyte sealing member engages the groove.

1 . A rechargeable battery comprising:
 an electrode assembly including a positive electrode, a negative electrode and a separator interposed therebetween;   a case for housing the electrode assembly;   a cap assembly combined with the case to seal the case, the cap assembly including a cap plate having a positive terminal connected to the positive electrode and a negative terminal connected to the negative electrode;   an electrolyte injection opening formed on the cap assembly;   a groove formed around a periphery of the electrolyte injection opening; and   an electrolyte sealing member engaged with the groove, the electrolyte sealing member covering and sealing the electrolyte injection opening.