My friend Jani OM0AVT approached me asking if I could design a simple battery case for him. He assembled a LiFePo4 battery from aliexpress with JIKONG BMS. After few days I came up with this proposal I sharing you now.
Used batteries: LiitoKala 3.2V 20Ah Battery LiFePO4 phosphate Cell
https://www.aliexpress.com/item/1005006060547440.html?spm=a2g0o.order_list.order_list_main.9.58c31802cEz9nu
Battery management system (BMS): JIKONG JK-BD4A8S4P
https://www.aliexpress.com/item/1005007587856160.html?spm=a2g0o.order_list.order_list_main.4.58c31802cEz9nu
Battery case designed in freecad
LiitoKala 3.2V 20Ah Battery LiFePO4
Battery case designed in Freecad (printed by Elegoo Neptune 3)
Assembled battery with BMS
JIKONG BMS JK-BD4A8S4P
Printing a case
Front panel design created in Freecad