def refresh_access_token(self, refresh_token):
res = self._get(<EOL>'<STR_LIT>',<EOL>params={<EOL>'<STR_LIT>': self.app_id,<EOL>'<STR_LIT>': '<STR_LIT>',<EOL>'<STR_LIT>': refresh_token<EOL>}<EOL>)<EOL>self.access_token = res['<STR_LIT>']<EOL>self.open_id = res['<STR_LIT>']<EOL>self.refresh_token = res['<STR_LIT>']<EOL>self.expires_in = res['<STR_LIT>']<EOL>return res<EOL>
刷新 access token

        :param refresh_token: OAuth2 refresh token
        :return: JSON 数据包