That is meant to be an autoloss, as you aren't supposed to force your way through the fence. In the room on the south end of that floor, you can make items, including the key to remove that fence, using the parts dropped when defeating drones.How do I get past the electric fence? The ambush battle that triggers is practically an autoloss
In order, the items are:
- Stat boost item: 5 drone parts
- Key to fence: 3 drone parts
- Equipment: 8 drone parts
- Activate the panel to the left, allows playing a mini-game: 8 drone parts
- Item that removes status inflicted by losing to capsule trap: 5 drone parts (Making the item doesn't cure the status, you have to use the item after making it to cure the status)
If you got the status from losing to a capsule trap, you will need to eventually remove it in order to be able to beat the final boss.