set_update_batch how to plus 1

PHP Code:

$data = array(
        array(
            'id' => 5,
            'name' => 'test',
            'visit' => '`visit` + 1'
        ),
        array(
            'id' => 7,
            'name' => 'wang',
            'visit' => '`visit` + 1'
        )
    );
$this->Test_model->set_update_batch($data, 'visit', false);
$this->Test_model->update_batch('table', $data, 'id'); 


but is don't work。

when use

PHP Code:

$update = array(
    'id' => 7,
    'name' => 'wang',
);
$this->Test_model->set('visit' , 'visit + 1', false)->update($data); 


it's OK ,can you help me how to use set_update_batch and update_batch