That part number(?), 1-102-03020-24M, doesn’t appear in any search results as a BMS so it is unlikely that without more information than is in that photo you will find any documentation by searching.
Your only, very slim, hope is that someone will recognize it and know where the documentation is.
Separately, why do you need the documentation? It seems that BMSs with the specs listed on the device are readily available and quite inexpensive.