Batch files (.bat) are basically a text files, you do not need to convert them to be able to open and edit them using a text editor. If you want you can simply rename bat to txt, but no conversion is needed.
Convert Batch file (executable) to Simple text file.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert bat to txt on Windows
A free source code and text editor for Windows
Convert from bat file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.