$spreadsheet->getActiveSheet()->setCellValue('E26', 'www.phpexcel.net');
$spreadsheet->getActiveSheet()->getCell('E26')->getHyperlink()->setUrl('https://www.example.com');
$spreadsheet->getActiveSheet()->setCellValue('E26', 'www.phpexcel.net');
$spreadsheet->getActiveSheet()->getCell('E26')->getHyperlink()->setUrl("sheet://'Sheetname'!A1");