@mrtummytumms: Its never fully confirmed, but evidence suggests joker does know where the bat cave is and that bruce is batman, he just doesn't care because the joker doesn't want their relationship to end.
Batman finds a Joker card in on the floor bat cave after destroying a joker blimp, but doesn't believe joker could of survived that far a journey to batcave. at end of the story its revealed that bruce wayne took the card to joker at arkham, which would confirm to joker that bruce wayne is batman or at least extremely well connected to batman. However, the Joker doesn't seem to care and give no reaction to wayne giving him the card.
Joker has the opportunity to remove the mask but doesn't because he already knows. Joker attacks Alfred at wayne manor (but its suggested this because wayne is supporting Batman Incorporated). The Joker grand plan takes place in the cave system near the bat cave.
to quote batman "I don't believe in coincidence"
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