Tesla battery pack gets UN approval
Many green car enthusiasts have expressed concern over the safety of Lithium-ion battery technology that will be featured in the Tesla Roadster. Hopefully, Tesla’s exemplary results in independant U.N. tests should put some of these fears to rest. The car’s ESS (Energy Storage System) has passed UN and UL 1642 test criteria for altitude simulation, thermal cycling, vibration, shock and external short circuit.
The ESS is made up of thousands of Lithium-ion cells, which have multiple layers of protection and a level of redundancy that reduces the risk of short circuit currents. Each cell has an internal positive temperature coefficient (PTC) current limiting device, as well as a current interrupt device (CID) that can b disconnect the cell in the event of over heating. Each cell has a fuse for the anode and a fuse for the cathode, so it can separate itself from the ESS if either fuse blows.
Additionally, all of the Roadster’s sensors and microprocessors continually monitor temperatures, currents and voltages of the ESS, and can disconnect the pack’s high voltage from the car if any abnormal conditions are detected.
Source: TreeHugger
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