Edit History

Or tray this solution, change only name of admin panel (adminPanelName).

$productLink  = _PS_BASE_URL_.__PS_BASE_URI__."adminPanelName/";
$productLink .= 'index.php?controller=AdminProducts';
$productLink .= '&token='.Tools::getAdminTokenLite('AdminProducts');
$productLink .= '&id_product='.(int) Tools::getvalue('id_product');
$productLink .= '&updateproduct&key_tab=Images&action=Images';

$this->context->smarty->assign(array(
    'editLink' => $productLink
));