How to include a PHP Framework / Library in my module?
Your file path is maybe incorrect. Try the code below:

function mymod_libraries_info() {

    global $base_url;
    $path = $base_url . '/sites/all/libraries/phpexcel/PHPExcel.php';

    $libraries['phpexcel'] = array(
        'name' =&gt; 'PHP Excel',
        'version arguments' =&gt; array(
            'file' =&gt; $path, 
            'pattern' =&gt; '/Version (\d+)/', 
            'lines' =&gt; 5,
        ),
    'files' =&gt; array(
       'php' =&gt; array('PHPExcel.php'), 
    ),
);
return $libraries;
}