Safety focus for EV battery pack

Safety focus for EV battery pack

New Products |
By Christoph Hammerschmidt

Chinese car maker BYD has launched the Blade Battery pack with a focus on safety in electric vehicles.

The Blade Battery has been developed by BYD over the past several years using the same idea as an embedded computing blade in a rack. The individual cells are arranged together in an array and then inserted into a battery pack. This structure increases the available space by over 50% compared to conventional lithium iron phosphate block batteries says the company.

While undergoing nail penetration tests, the Blade Battery emitted neither smoke nor fire after being penetrated, and its surface temperature only reached 30 to 60°C. Under the same conditions, a ternary lithium battery exceeded 500°C and violently burned, and while a conventional lithium iron phosphate block battery did not openly emit flames or smoke, its surface temperature reached dangerous temperatures of 200 to 400°C. The company says this means EVs equipped with the Blade Battery would be far less susceptible to catching fire even when they are severely damaged.

The Blade Battery also passed other extreme test conditions, such as being crushed, bent, being heated in a furnace to 300°C and overcharged by 260%. None of these resulted in a fire or explosion, said He Long, Vice President of BYD and Chairman of FinDreams Battery.

“Today, many vehicle brands are in discussion with us about partnerships based on the technology of the Blade Battery,” said He Long. He said the company was open to working with global partners on the technology.

The Han EV, BYD’s flagship electric car, is planned for launch this June and uses the Blade Battery pack to provide a range of 605 km and an acceleration of 0 to 100km/h in 3.9 seconds. The energy density of 140Wh/kg is lower than that of other lithium ion packs, but the use of additional space allows a higher capacity to get the extra range.

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