Hi,
Check out this model: https://www.mathworks.com/matlabcentral/fileexchange/63791-voltage-control-dc-dc-bidirectional-converter
It is a DC DC voltage controlled bidirectional converter, or check this model which is current controlled bidirectional converter:
https://www.mathworks.com/matlabcentral/fileexchange/63330-current-controller-dc-dc-bidirectional-converter
In either models, you can add a current rate limiter based on the maximum C-rate of your battery. Rate limiter is a block in the library
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