PHPExcel - Image in a cell

$objDrawing = new PHPExcel_Worksheet_Drawing();
$objDrawing->setName('test_img');
$objDrawing->setDescription('test_img');
$objDrawing->setPath('assets/images/success.png');
$objDrawing->setCoordinates('A4');
$objDrawing->setWorksheet($objPHPExcel->getActiveSheet());