Hi,
As far as I know there is no solution that allows you to secure your password in batch file. However, there is always at least one trick. For example in this case you can use some software to convert your batch file to exe this will make your source code secure out of box. I am sure if you google you will find a lot of different options.
The other way is more complicated but possible, user shell instead of batch file and relay on windows authentication.
To get some hints see the below link as well:
Secure use of passwords in batch files? - Microsoft Windows - Neowin[
^]
Cheers,
AH