Infineon yesterday launched a battery management chipset with an iso-UART interface that would link to wireless chips to replace the wiring harness in a battery pack in an electric vehicle. A wireless BMS reduces the weight and complexity of the battery pack but raises reliability issues that the company is exploring.
“On the connectivity side we also see advanced communications by introducing wireless communications,” said Dr Clemens Mueller, director of applications management at Infineon. “The communications has to be robust and there are different cell topologies in a pack depending on how many cells are in parallel or series so different topologies.”
“Currently different technologies are being evaluated in the market,” he said, “There were publications of initial prototypes, which realized wireless connectivity via WPLAN mesh networks following the 2.4 GHz, IEEE 802.15.4e standard. Others are experimenting with WLAN and Bluetooth technologies. It’s still too early to position for a clear mainstream technology.”
The 802.11e standard added quality of service support to 2.4GHz wireless systems and was included in the standard back in 2007. This month’s completion of the acquisition of Cypress Semiconductor brings substantial engineering experience of the 802.11 standards into the company.
The TLE 9012 was launched yesterday, and Mueller emphasises the need for security, which is also key for wireless BMS systems. “With security it is important to identify the pack and cell set up and protect the configuration data,” he said. This will be important for new business models such as ‘black box’ data recorders for insurance companies and the warranty around the battery packs. “The security is key for new use cases and business models around batteries that require protected use of data such as flight recorder for insurance companies or pay per use models if you rent or lease a car,” he said.
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